Other Associates and Joint Ventures that are Not Individually Material Other Associates And Joint Ventures That Are Not Individually Material [Table Text Block] Other Associates And Joint Ventures That Are Not Individually Material [Table Text Block] Category Of PSU [Domain] Category Of PSU [Domain] Category Of PSU [Domain] Other working capital and provisions movements Increase (Decrease) In Other Working Capital And Other Provisions Increase (Decrease) In Other Working Capital And Other Provisions Number of capital increases Number of Capital Increases Number of Capital Increases Unused tax credits for which no deferred tax asset recognised Unrecognized Unused tax credits for which no deferred tax asset recognised Belgo Bekaert Arames ("BBA") Belgo Bekaert Arames (BBA) [Member] Belgo Bekaert Arames (BBA) [Member] Reclassification adjustments for gain included in the consolidated statements of operations and financial position (basis adjustments) Reclassification Adjustments On Share Of Other Comprehensive Income Of Associates And Joint Ventures Accounted For Using Equity Method Reclassification Adjustments On Share Of Other Comprehensive Income Of Associates And Joint Ventures Accounted For Using Equity Method Wages and salaries Wages and salaries Movement in year (in shares) Increase (Decrease) In Number Of Treasury Shares Held Increase (Decrease) In Number Of Treasury Shares Held Proportion of ownership interests held by non-controlling interests (in percent) % of non-controlling interests and non-controlling voting rights (in percent) Proportion of ownership interests held by non-controlling interests Entity file number Entity File Number Total deferred tax expense (benefit) Deferred tax expense (income) Increase in other provisions Increase (decrease) in other provisions Other non-derivative financial assets and liabilities Other Non-Derivative Financial Assets And Liabilities [Policy Text Block] Other Non-Derivative Financial Assets And Liabilities [Policy Text Block] Levels of fair value hierarchy [domain] Levels of fair value hierarchy [domain] Intersegment sales Elimination of intersegment amounts [member] Net defined benefit liability (asset) [axis] Net defined benefit liability (asset) [axis] Schedule of Right-of-use Assets, Depreciation and Impairment Disclosure Of Right-of-use Assets And Depreciation [Table Text Block] Disclosure Of Right-of-use Assets And Depreciation [Table Text Block] No later than three years No Later Than Three Years [Member] No Later Than Three Years Rajayapeta in Andhra Pradesh Rajayapeta in Andhra Pradesh [Member] Rajayapeta in Andhra Pradesh 6-12 months Later than six months and not later than one year [member] Unrealized gains (losses) recognized in other comprehensive income Other comprehensive income, net of tax, gains (losses) from investments in equity instruments Grant date December 8, 2023, maturity due January 2027 Grant date December 8, 2023, Maturity due January 2027 [Member] Grant date December 8, 2023, Maturity due January 2027 Gain (loss) arising during the period Gains (Losses) On Change In Derivative Instruments, Before Tax Gains (Losses) On Change In Derivative Instruments, Before Tax Number of shares exited (in shares) Number of shares, Exited (in shares) Number of other equity instruments exercised or vested in share-based payment arrangement Goodwill and intangible assets Goodwill beginning balance Goodwill ending balance Intangible assets and goodwill PSU and RSU Performance Share Units (PSU) And Restricted Share Units (RSU) [Member] Performance Share Units (PSU) And Restricted Share Units (RSU) Statement of comprehensive income [abstract] Statement of comprehensive income [abstract] Forward purchase contracts Forward Purchase Contract [Member] Forward Purchase Contract [Member] Equity holders of the parent Other comprehensive income, attributable to owners of parent After offset amount, offset amount and before offset amount [Domain] After Offset Amount, Offset Amount And Before Offset Amount [Domain] [Domain] for After Offset Amount, Offset Amount And Before Offset Amount [Axis] Kazakhstan Operations Kazakhstan Operations [Member] Kazakhstan Operations Non-derivative financial liabilities Non-derivative Financial Liabilities [Abstract] Non-derivative Financial Liabilities [Abstract] Cross currency swap, maturity June 2018 Cross Currency Swap, 100 Notional Amount, Maturity June 2018 [Member] Cross Currency Swap, 100 Notional Amount, Maturity June 2018 Others Other products [Member] Other products [Member] Trade accounts receivable and other Adjustments for decrease (increase) in trade accounts receivable Tranche [Axis] Tranche [Axis] Tranche Commercial agreements and onerous contracts Onerous contracts provision [member] Acquisitions through business combinations, intangible assets and goodwill Acquisitions through business combinations, intangible assets and goodwill Derivative financial instruments (notes 6.1 and 6.3) Total current derivative liabilities (note 4.8) Current derivative financial liabilities Interest cost on unrecoverable surplus Interest Expense, Unrecoverable Surplus In Plan Interest Expense, Unrecoverable Surplus In Plan Arceo5 Arceo [Member] Arceo [Member] Provisions Description of accounting policy for provisions [text block] Classes of intangible assets other than goodwill [axis] Classes of intangible assets other than goodwill [axis] 85 Million Shares Program, May 2023 85 Million Shares Program, May 2023 [Member] 85 Million Shares Program, May 2023 €500 million Unsecured Notes 500 Million EUR Unsecured Notes, Due 2031 [Member] 500 Million EUR Unsecured Notes, Due 2031 EIB Loan EIB Loan [Member] EIB Loan Tranche One Tranche One [Member] Tranche One Revenue, remaining performance obligation, (in percent) Revenue, Remaining Performance Obligation, Percent Revenue, Remaining Performance Obligation, Percent Financing activities: Cash flows from (used in) financing activities [abstract] Actuarial (gain) loss Decrease (increase) in net defined benefit liability (asset) resulting from gain (loss) on remeasurement in other comprehensive income Pending Pending [Member] Pending Disclosure of reconciliation of changes in property, plant and equipment, including right-of-use assets [table] Disclosure of reconciliation of changes in property, plant and equipment, including right-of-use assets [table] Total comprehensive income (loss) Total comprehensive (loss) income Comprehensive income Net carrying amount Net Carrying Amount [Member] Net Carrying Amount Disclosure of Net Defined Benefit Liability (Asset) Disclosure of net defined benefit liability (asset) [text block] Operating loss carryforward, amount Total Operating Losses Carryforwards1 Operating Losses Carryforwards1 Other Hedges Other Hedges [Member] Other Hedges Future taxable income increase due to tax integration Increase (Decrease) In Projected Future Taxable Income (Loss) Due To Tax Integration Increase (Decrease) In Projected Future Taxable Income (Loss) Due To Tax Integration Financial Instruments [Abstract] Financial Instruments [Abstract] Financial Instruments [Abstract] Payable from acquisition of intangible, tangible & financial assets Current payables for purchase of non-current assets Other investing activities net Other inflows (outflows) of cash, classified as investing activities Cross currency swap, maturity January 2026 Cross Currency Swap, 660 Notional Amount, Maturity January 2026 [Member] Cross Currency Swap, 660 Notional Amount, Maturity January 2026 Trade accounts receivable and other - opening balance Trade accounts receivable and other - ending balance Contract assets Exeltium Exeltium S.A.S. [Member] Exeltium S.A.S. [Member] Value Added Tax Value Added Tax [Member] Value Added Tax [Member] Cost of sales Cost of sales [member] Investments Accounted for Under the Equity Method Investment In Associates And Joint Ventures Accounted For Using Equity Method [Table Text Block] Investment In Associates And Joint Ventures Accounted For Using Equity Method [Table Text Block] Goodwill Description of accounting policy for goodwill [text block] Trading symbol Trading Symbol 1000000000 billion Unsecured Notes One Billion Unsecured Notes, Due 2041 [Member] One Billion Unsecured Notes, Due 2041 [Member] Forward contract Forward contract [member] Write off of tax assessment Loss Contingency, Write off Of Tax Assessment, Amount Loss Contingency, Write off Of Tax Assessment, Amount Short-term bank loans and other credit facilities including commercial paper Current borrowings Other long-term obligations Other long-term liabilities Other non-current liabilities Classes of other provisions [domain] Classes of other provisions [domain] Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] Number of states Number of States Number of States Shares issued out of treasury shares (in shares) Increase (decrease) in number of ordinary shares issued ACCOUNTING PRINCIPLES Disclosure of general information about financial statements [text block] Tax expense (benefit) at the statutory rates applicable to profits (losses) in the countries Tax expense (income) at applicable tax rate Construction in progress Construction in progress [member] ASSETS Assets [abstract] Gearing (in percent) Capital Management, Gearing Percentage Capital Management, Gearing Percentage Market price of emissions rights (in Euro per tonne) Market Price Of Emissions Rights Per Ton Market Price Of Emissions Rights Per Ton Current assets: Current assets [abstract] Schedule of Movements in Trade and Other Receivables Explanation of significant changes in contract assets and contract liabilities [text block] Cash contributions to plan assets and benefits paid for pensions and other post-employment benefits Increase (decrease) in net assets available for benefits Exchange rates changes Increase (Decrease) Through Net Exchange Differences, Unrecoverable Surplus In Plan Increase (Decrease) Through Net Exchange Differences, Unrecoverable Surplus In Plan Maximum percentage of tax value Loss Continency, Maximum Percentage Of Tax Value Percentage Of Tax Value Non-current assets: Non-current assets [abstract] Reserves Miscellaneous Other Reserves Miscellaneous Other Reserves Restricted Share Units (RSUs) and Performance Share Units (PSUs) Restricted Share Units (RSU) And Performance Share Units (PSU) [Member] Restricted Share Units (RSU) And Performance Share Units (PSU) [Member] Europe Europe Segment [Member] Europe Segment [Member] Capacity of cold rolling facility Capacity Of Cold Rolling Facility Capacity Of Cold Rolling Facility Cash and cash equivalents recognised as of acquisition date Cash and cash equivalents recognised as of acquisition date Kryvyi Rih industrial gas Kryvyi Rih Industrial Gas [Member] Kryvyi Rih Industrial Gas Document Information [Line Items] Document Information [Line Items] Award vesting performance, target percentage (in percent) Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Performance Target Percentage Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Performance Target Percentage Loan receivable Loans Receivable, Related Party Loans Receivable, Related Party Acquisitions through business combinations (note 2.2.4) Acquisitions through business combinations, property, plant and equipment including right-of-use assets Reasonable possible decrease in risk variable, derivatives Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Decrease In Risk Variable, Derivatives Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Decrease In Risk Variable, Derivatives Subsequent Exercise Option [Domain] Subsequent Exercise Option [Domain] Subsequent Exercise Option [Domain] Decarbonization capital expenditure Decarbonization Capital Expenditure Decarbonization Capital Expenditure Increase (decrease) in pre-tax expense due to reasonably possible increase in actuarial assumption Increase (Decrease) In Defined Benefit Plan Expense Due To Reasonably Possible Increase In Actuarial Assumption Increase (Decrease) In Defined Benefit Plan Expense Due To Reasonably Possible Increase In Actuarial Assumption 500 Unsecured Notes Five Hundred Million Unsecured Notes, Due 2029 [Member] Five Hundred Million Unsecured Notes, Due 2029 [Member] Other commitments, industrial capital expenditure Other Commitments, Industrial Capital Expenditure Other Commitments, Industrial Capital Expenditure Number of facilities combined for impairment testing Number Of Facilities Combined For Impairment Testing Number Of Facilities Combined For Impairment Testing Allowance for slow-moving inventory, excess of cost over net realizable value and obsolescence Inventory write-downs - opening balance Inventory write-downs - closing balance Inventory Valuation Reserves1 Inventory Valuation Reserves Kirandul-Vizag system Kirandul-Vizag System [Member] Kirandul-Vizag System Trade accounts payable and other to related parties Current payables to related parties Accrued Expenses and Other Liabilities Accrued Expenses and Other Liabilities [Member] Accrued Expenses and Other Liabilities ArcelorMittal International Luxembourg S.A. ArcelorMittal International Luxembourg S.A. [Member] ArcelorMittal International Luxembourg S.A. [Member] Adjusted average frequency rate, term Adjusted Average Frequency Rate, Term Adjusted Average Frequency Rate, Term Investing activities: Cash flows from (used in) investing activities [abstract] Dividends proposed or declared (in USD per share) Dividends proposed or declared before financial statements authorised for issue but not recognised as distribution to owners per share Plan participants’ contribution Decrease (increase) in net defined benefit liability (asset) resulting from contributions to plan by plan participants Others All other segments [member] 1.2 billion Unsecured Bonds One Point Two Billion Unsecured Bonds, Due 2027 [Member] One Point Two Billion Unsecured Bonds, Due 2027 Cash and cash equivalents Description of accounting policy for determining components of cash and cash equivalents [text block] Reconciliation of number of shares outstanding [abstract] Reconciliation of number of shares outstanding [abstract] Capacity of steel production (in tonnes) Capacity Of Steel Production Capacity Of Steel Production Total non-current assets Non-current assets Non-current assets Reconciliation of changes in fair value measurement, liabilities [abstract] Reconciliation of changes in fair value measurement, liabilities [abstract] Sustainable Solutions acquisitions Sustainable Solutions Acquisitions [Member] Sustainable Solutions Acquisitions Disclosure of defined benefit plans [table] Disclosure of defined benefit plans [table] Tax credits on interstate sales of electricity Tax Credits on Interstate Sales of Electricity [Member] Tax Credits on Interstate Sales of Electricity [Member] Classes of property, plant and equipment [axis] Classes of property, plant and equipment [axis] Cash-generating units [axis] Cash-generating units [axis] Actuarial assumptions [domain] Actuarial assumptions [domain] Overdue 1-30 days Not later than one month [member] Reconciliation of changes in intangible assets other than goodwill [abstract] Reconciliation of changes in intangible assets other than goodwill [abstract] AMNS India AMNS India [Member] AMNS India Joint ventures Investments in joint ventures accounted for using equity method Investments in joint ventures accounted for using equity method Award date [Domain] Award Date1 [Domain] [Domain] for Award Date [Axis] Effect of exchange rate changes on cash Impact of currency movements on cash Effect of exchange rate changes on cash and cash equivalents ArcelorMittal Bremen GmbH ArcelorMittal Bremen GmbH [Member] ArcelorMittal Bremen GmbH [Member] Settlement of preexisting relationships Consideration Paid Related to Pre-existing Relationships Consideration Paid Related to Pre-existing Relationships Entities [Table] Entities [Table] Executive Officers other than CFO Executive Officers Plan Other Than CFO [Member] Executive Officers Plan [Member] Electricity option, percentage of opt-out volumes to be acquired Electricity Option, Percentage Of Opt-Out Volumes To Be Acquired Electricity Option, Percentage Of Opt-Out Volumes To Be Acquired Percentage of reasonably possible increase in actuarial assumption (in basis points) Percentage of reasonably possible increase in actuarial assumption Disclosure of detailed information about financial instruments [table] Disclosure of detailed information about financial instruments [table] (Acquisitions) disposals of financial assets Proceeds From (Payments For) Sales (Purchase) Of Financial Instruments Classified As Investing Activities Proceeds From (Payments For) Sales (Purchase) Of Financial Instruments Classified As Investing Activities Decrease through loss of control of subsidiary, deferred tax asset Increase (decrease) through loss of control of subsidiary, deferred tax liability (asset) Trade accounts receivable and other (including 272 and 322 from related parties at December 31, 2025 and 2024, respectively) Trade accounts receivable and other Trade and other current receivables Entity interactive data current Entity Interactive Data Current European Bank For Reconstruction And Development (EBRD) 2025 European Bank For Reconstruction And Development (EBRD) 2025 [Member] European Bank For Reconstruction And Development (EBRD) 2025 Derivative financial current assets Derivative Financial Assets, Current [Member] Derivative Financial Assets, Current [Member] Receivables due from related parties Receivables due from related parties Provision of guarantees or collateral to entity, third party transactions Provision of guarantees or collateral by entity, third party transactions Provision of guarantees or collateral by entity, third party transactions Disclosure of maturity analysis of operating lease payments [table] Disclosure of maturity analysis of operating lease payments [table] Vesting Based on TSR Compared To Performance Index, Stretch Level Vesting Based on TSR Compared To Performance Index, Stretch Level [Member] Vesting Based on TSR Compared To Performance Index, Stretch Level Spain, and the United States Spain, And The United States [Member] Spain, And The United States [Member] Levels of fair value hierarchy [axis] Levels of fair value hierarchy [axis] Consideration paid (received) Consideration received Consideration paid (received) Equity attributable to the equity holders of the parent Equity attributable to owners of parent [member] Bonds issued Bonds Issued [Member] Bonds Issued 2030 Tax Year 2030 [Member] Tax Year 2030 Individual assets or cash-generating units [domain] Individual assets or cash-generating units [domain] Income tax expense Adjustments for income tax expense Disposal group, disposed of by sale, not discontinued operations Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] Maximum exposure to credit risk Amount by which credit derivatives or similar instruments related to financial assets designated as measured at fair value through profit or loss mitigate maximum exposure to credit risk Flat products Flat products [Member] Flat products [Member] 2028 Tax Year 2028 [Member] Tax Year 2028 Entity central index key Entity Central Index Key Production capacity, number of pellet tonnes per annum Production Capacity, Number Of Pellet Tonnes Per Annum Production Capacity, Number Of Pellet Tonnes Per Annum Payment of principal portion of lease liabilities and other financing activities Payments Of Lease Liabilities And Other, Classified As Financing Activities Payments Of Lease Liabilities And Other, Classified As Financing Activities Schedule of Cost of Sales Schedule Of Cost Of Sales [Table Text Block] Schedule Of Cost Of Sales [Table Text Block] Net income (including non-controlling interests) Profit (loss), attributable to [abstract] Net income of combined entity as if combination occurred at beginning of period Profit (loss) of combined entity as if combination occurred at beginning of period Risk exposure associated with instruments sharing characteristic Risk exposure associated with instruments sharing characteristic Schedule of Goodwill Acquired Disclosure of reconciliation of changes in goodwill [text block] Proceeds from repayment of a loan in connection with the sale of ArcelorMittal Temirtau Cash receipts from repayment of advances and loans made to related parties Gain (loss) arising during the period Gains (losses) on cash flow hedges, before tax Deferred tax expense (benefit) Deferred Tax [Abstract] Deferred Tax Potential termination options Lease Termination Option, Amount Lease Termination Option, Amount VAT and other amounts (paid) received to/from public authorities Adjustments For Value Added Tax And Other Amounts Received From (Paid To) Public Authorities Adjustments For Value Added Tax And Other Amounts Received From (Paid To) Public Authorities Percentage vesting condition contributes to calculation of grant (in percent) Share-based Compensation Arrangement By Share-based Payment Award, Percentage Vesting Condition Contributes To Calculation Of Grant Share-based Compensation Arrangement By Share-based Payment Award, Percentage Vesting Condition Contributes To Calculation Of Grant Currency swaps sales Currency Swap Sales [Member] Currency Swap Sales [Member] Performance of ROCE, stretch level Vesting Based On Performance Of ROCE, Stretch Level [Member] Vesting Based On Performance Of ROCE, Stretch Level Other adjustments Investments in Associates, Other Adjustments Other Adjustments to reconcile the financial statements of the associates to the carrying value Contractual commitments to sell Supply Commitment, Remaining Minimum Amount Committed Supply Commitment, Remaining Minimum Amount Committed LEASES Disclosure of leases [text block] Type Of Obligation [Axis] Type Of Obligation [Axis] Type Of Obligation Total comprehensive income (loss) Share of total comprehensive income of associates and joint ventures accounted for using equity method Borrowings extension option exercised Borrowings, Extension Option Term, Exercised Borrowings, Extension Option Term, Exercised Other cash payments to acquire interests in joint ventures, classified as investing activities Other cash payments to acquire interests in joint ventures, classified as investing activities Additional paid-in capital Additional paid-in capital AMSF ArcelorMittal Sul Fluminense [Member] ArcelorMittal Sul Fluminense [Member] Provision on pensions and other post-employment benefits Adjustments for increase (decrease) in employee benefit liabilities Aperam Aperam Aperam Société Anonyme [Member] Aperam Société Anonyme [Member] 5.5 billion revolving credit facility, due 2023-2025 Five Point Five Billion Revolving Credit Facility, Due 2023-2025 [Member] Five Point Five Billion Revolving Credit Facility, Due 2023-2025 Individually immaterial joint ventures and associates Investments Accounted For Using Equity Method, Individually Immaterial Joint Ventures And Associates Investments Accounted For Using Equity Method, Individually Immaterial Joint Ventures And Associates Annual investment commitment Annual Investment Commitment, Investments In Equity Instruments Designated At Fair Value Through Other Comprehensive Income Annual Investment Commitment, Investments In Equity Instruments Designated At Fair Value Through Other Comprehensive Income Tuper S.A. Tuper S.A. [Member] Tuper S.A. [Member] Revolving multi-currency letter of credit facility, due 2027 Revolving Multi-Currency Letter Of Credit Facility, Due 2027 [Member] Revolving Multi-Currency Letter Of Credit Facility, Due 2027 Analysis of Financing Costs Disclosure Of Finance Cost Explanatory [Table Text Block] Disclosure Of Finance Cost Explanatory [Table Text Block] 2026 Tax Year 2026 [Member] Tax Year 2026 [Member] Cross currency swap Maturity January 2016 Cross Currency Swap, 375 Notional Amount, Maturity January 2016 [Member] Cross Currency Swap, 375 Notional Amount, Maturity January 2016 Statement of cash flows [abstract] Statement of cash flows [abstract] Reclassification adjustments on cash flow hedges for which hedged item affected profit or loss, net of tax Reclassification adjustments on cash flow hedges for which hedged item affected profit or loss, net of tax Steel plant capacity (in tonnes) Steel Plant Capacity Steel Plant Capacity Gross amount Temporary Difference, Unused Tax Losses And Unused Tax Credits, Amount Temporary Difference, Unused Tax Losses And Unused Tax Credits, Amount Non-controlling interests Other comprehensive income, attributable to non-controlling interests Property, plant and equipment Property, Plant and Equipment Related Temporary Differences [Member] Property, Plant and Equipment Related Temporary Differences [Member] Consideration allocated to debt component Increase (Decrease) Through Conversion Of Convertible Instruments, Debt Increase (Decrease) Through Conversion Of Convertible Instruments, Debt Reasonable possible decrease in risk variable, debt Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Decrease In Risk Variable, Debt Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Decrease In Risk Variable, Debt Counterparty Name [Domain] Counterparty Name [Domain] Unearned revenue and accrued payables Accruals and deferred income including contract liabilities Disclosure of dividends [Table] Dividends Payable1 [Table] Dividends Payable1 [Table] Disclosure of provision matrix [table] Disclosure of provision matrix [table] Tax effects of foreign currency translation Tax effect of foreign tax rates Tax effect of foreign tax rates Power purchasing agreement, term Power Purchasing Agreement, Term Power Purchasing Agreement, Term Accrued interest and other payables Current Interest Payable And Other Sundry Liabilities, Current Current Interest Payable And Other Sundry Liabilities, Current Other staff expenses Other employee expense Disclosure of products and services [line items] Disclosure of products and services [line items] Restricted Cash Restricted Cash [Member] Restricted Cash Gap to competition, stretch Vesting Based on Gap To Competition, Stretch Level [Member] Vesting Based on Gap To Competition, Stretch Level Unlimited tax period Unlimited Tax Period [Member] Unlimited Tax Period [Member] Tax Year 2014 2014 Tax Year [Member] 2014 Tax Year Cash guarantees and deposits Long-term deposits Calvert1 AMNS Calvert (Calvert) [Member] AMNS Calvert (Calvert) Investments in associates and joint ventures Total Carrying amount of interests in associates and joint ventures Investments accounted for using equity method Reduction in tax assessment Loss Contingency, Reduction in Damages Sought Loss Contingency, Reduction in Damages Sought Natural gas forward purchase contract Natural Gas Forward Purchase Contract [Member] Natural Gas Forward Purchase Contract Consideration Transferred [Domain] Consideration Transferred [Domain] Consideration Transferred [Domain] Other investments Non-current investments other than investments accounted for using equity method Total, contractual cash flow Non-derivative financial liabilities, undiscounted cash flows Carrying amount Financial Instruments Designated As Hedging Instruments Unwound, At Fair Value Financial Instruments Designated As Hedging Instruments Unwound, At Fair Value Percentage of reasonably possible decrease in actuarial assumption (in basis points) Percentage of reasonably possible decrease in actuarial assumption Terms and Conditions of Share-based Payment Arrangements Disclosure of terms and conditions of share-based payment arrangement [text block] Grant date December 5, 2024, Maturity due December 2027 Grant date December 5, 2024, Maturity due December 2027 [Member] Grant date December 5, 2024, Maturity due December 2027 Rate of compensation increase (in percent) Actuarial assumption of expected rates of salary increases Target percentage of woman in management Target Percentage Of Woman In Management Target Percentage Of Woman In Management Acquisition of and capital increase in associates and joint ventures Purchase of interests in investments accounted for using equity method Document shell company report Document Shell Company Report Disclosure of other provisions [line items] Disclosure of other provisions [line items] €25m varible rate loan €25m Varible Rate Loan [Member] €25m Varible Rate Loan Other loans and leases Other Loans And Lease Other Loans And Lease Employer contribution Decrease (increase) in net defined benefit liability (asset) resulting from resulting from contributions to plan by employer Derivative financial instruments Description of accounting policy for derivative financial instruments and hedging [text block] €750 million Unsecured Notes Seven Hundred Fifty Million EUR Unsecured Notes, Due 2025 [Member] Seven Hundred Fifty Million EUR Unsecured Notes, Due 2025 [Member] Term contracts sales Term Contracts Sales [Member] Term Contracts Sales [Member] Steel operations capacity (percentage) Steel Operations Capacity Steel Operations Capacity Cash flow hedge reserve at beginning of period Cash flow hedge reserve at end of period Reserve of cash flow hedges, continuing hedges 1000000000 billion Unsecured Notes One Billion Unsecured Notes, Due 2032 [Member] One Billion Unsecured Notes, Due 2032 Offtake agreement, period Offtake Agreement, Period Offtake Agreement, Period Borrowing costs capitalised Borrowing costs capitalised Unrealized foreign exchange effects and other movements Increase (decrease) through other changes, liabilities arising from financing activities Discount rate (in percent) Actuarial assumption of discount rates Fair value of investments in associates for which there are quoted market prices Fair value of investments in associates for which there are quoted market prices D&I Diversity And Inclusion (D&I) [Member] Diversity And Inclusion (D&I) Climate change disclosure Climate Change Disclosure [Policy Text Block] Climate Change Disclosure Changes in assets and liabilities that provided (required) cash, net of acquisitions and disposals: Increase (Decrease) in Operating Capital [Abstract] Increase (Decrease) in Operating Capital [Abstract] Manufacturing supplies, spare parts and other Current Production Supplies, Spare Parts, And Other Inventories Current Production Supplies, Spare Parts, And Other Inventories TSR vs peer group Vesting Based on TSR Compared To Peer Group [Member] Vesting Based on TSR Compared To Peer Group ArcelorMittal Belval & Differdange S.A. ArcelorMittal Belval & Differdange S.A. [Member] ArcelorMittal Belval & Differdange S.A. [Member] €263m variable rate loan €263m Variable Rate Loan [Member] €263m Variable Rate Loan Disclosure of Income Tax Recorded Directly in Equity Disclosure Of Income Tax Recorded Directly In Equity [Table Text Block] Disclosure Of Income Tax Recorded Directly In Equity Capacity of finishing facility Capacity Of Finishing Facility Capacity Of Finishing Facility China Oriental China Oriental Group Company Limited [Member] China Oriental Group Company Limited [Member] 1.0 billion Unsecured Bonds One Billion Unsecured Bonds, Due 2039 [Member] One Billion Unsecured Bonds, Due 2039 [Member] Permanent items Permanent items Tax Effect Of Permanent Differences Tax Effect Of Permanent Differences ArcelorMittal Dofasco G.P. ArcelorMittal Dofasco G.P. [Member] ArcelorMittal Dofasco G.P. [Member] Schedule of Prepaid Expenses and Other Current Assets Deferred Costs, Capitalized, Prepaid, And Other Assets Disclosure1 [Table Text Block] Deferred Costs, Capitalized, Prepaid, And Other Assets Disclosure Value of grant at grant date, percentage of base salary (in percent) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grant Amount As Base Salary, Percentage Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grant Amount As Base Salary, Percentage Newcastle Works Site Newcastle Works Site [Member] Newcastle Works Site [Member] Provisions, beginning balance Provisions, ending balance Provisions Other provisions Trade accounts payable and other Adjustments for increase (decrease) in trade accounts payable Other temporary differences Other temporary differences [member] Disclosure of reserves within equity [line items] Disclosure of reserves within equity [line items] Cash-generating units [domain] Cash-generating units [domain] Number of employees Number of employees VAMA Valin ArcelorMittal Automotive Steel [Member] Valin ArcelorMittal Automotive Steel [Member] BRL Brazil, Brazil Real Operating activities: Cash flows from (used in) operating activities [abstract] ArcelorMittal USA LLC ArcelorMittal USA LLC [Member] ArcelorMittal USA LLC [Member] Cash Flow Hedge Reserve Rollforward: Cash Flow Hedge Reserve Rollforward [Roll Forward] Cash Flow Hedge Reserve Rollforward [Abstract] Selling, general and administrative expenses Selling, general and administrative expense Document period end date Document Period End Date Total Contractual Obligation1 Contractual Obligation Borçelik Borçelik Borcelik Celik Sanayii Ticaret Anonim Sirketi [Member] Borcelik Celik Sanayii Ticaret Anonim Sirketi [Member] Non-adjusting events after reporting period [domain] Non-adjusting events after reporting period [domain] 3 months and less Not later than three months [member] Deferred tax expense (benefit) Deferred tax relating to items credited (charged) directly to equity Tekno Tekno S.A. - Indústria e Comércio [Member] Tekno S.A. - Indústria e Comércio Classes of financial instruments [axis] Classes of financial instruments [axis] Number of EAFs Number of EAFs Number of EAFs Compensation expense Expense from share-based payment transactions with employees Disclosure Of Potential Exposure To Future Cash Outflows Not Reflected In Measurement Of Lease Liability [Line Items] Disclosure Of Potential Exposure To Future Cash Outflows Not Reflected In Measurement Of Lease Liability [Line Items] [Line Items] for Disclosure Of Potential Exposure To Future Cash Outflows Not Reflected In Measurement Of Lease Liability [Table] Classes of financial assets [axis] Classes of financial assets [axis] Biological assets Description of accounting policy for biological assets [text block] Lease liabilities (undiscounted) Gross lease liabilities Expected increase of production (in tonne) Expected Increase of Production Expected Increase of Production Tax credits for which deferred tax asset recognised Recognized Tax Credits For Which Deferred Tax Asset Recognised Tax Credits For Which Deferred Tax Asset Recognised Trade organizations Case Filed By Trade Organizations [Member] Case Filed By Trade Organizations [Member] Capacity of renewable energy (in GW) Renewable Energy Capacity Renewable Energy Capacity Mining operations capacity (percentage) Mining Operations Capacity Mining Operations Capacity AMKR ArcelorMittal Kryvyi Rih ("AMKR") [Member] ArcelorMittal Kryvyi Rih [Member] Reserve of cash flow hedges Reserve of cash flow hedges Statistical Measurement [Axis] Statistical Measurement [Axis] Euler Hermes Re Euler Hermes Re [Member] Euler Hermes Re Revenue of combined entity as if combination occurred at beginning of period Revenue of combined entity as if combination occurred at beginning of period Tranche Two Tranche Two [Member] Tranche Two Classes of assets [axis] Classes of assets [axis] Reasonably possible decrease in risk variable percent (in percent) Reasonably possible decrease in risk variable percent (in basis points) Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Decrease In Risk Variable, Percent Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Decrease In Risk Variable, Percent Operating segments Operating segments [member] Asset-Based Revolving Credit Facility Asset-Based Revolving Credit Facility [Member] Asset-Based Revolving Credit Facility [Member] 2030 Later than four years and not later than five years [member] Revenue of acquiree since acquisition date Revenue of acquiree since acquisition date Defined benefit liabilities Pension Plan, Other Post-employment, And Termination Benefit Plans [Member] Pension Plan, Other Post-employment, And Termination Benefit Plans [Member] Disclosure of performance obligations [table] Disclosure of performance obligations [table] Number of solar energy projects signed Number Of Solar Energy Projects Signed Number Of Solar Energy Projects Signed Earnings per common share (in U.S. dollar) Earnings per share [abstract] Range [axis] Range [axis] Total foreign exchange rate instruments Foreign Exchange Rate Instruments [Member] Foreign Exchange Rate Instruments [Member] Fixed interest rate Fixed interest rate [member] Disclosure of Liabilities Based on Categories Disclosure of financial liabilities [text block] Disposal of Arcelor Mittal Zenica and Prijedor (note 2.3) Increase (decrease) through disposal of subsidiary, equity Grant date December 8, 2023, maturity due December 2026 Grant date December 8, 2023, Maturity due December 2026 [Member] Grant date December 8, 2023, Maturity due December 2026 Logistic expenses Transportation expense Income before taxes Income before taxes Profit (loss) before tax Disposals of net assets of subsidiaries, net of cash disposed of 10, nil and 24 in 2025, 2024 and 2023, respectively Cash flows from losing control of subsidiaries or other businesses, classified as investing activities Depreciation and impairment, right-of-use assets Depreciation And Impairment, Right-of-use Assets Depreciation And Impairment, Right-of-use Assets Disposal group name [Axis] Disposal Group Name [Axis] Disposal Group Name [Axis] EQUITY Disclosure of share capital, reserves and other equity interest [text block] €650000000000 million Unsecured Notes Six Hundred Fifty Million EUR Unsecured Notes, Due 2030 [Member] Six Hundred Fifty Million EUR Unsecured Notes, Due 2030 Non-steel sales Non-Steel Sales [Member] Non-Steel Sales [Member] Net change in measurement of deferred tax assets Tax Effect Of Deferred Assets Measurement Adjustment Tax Effect Of Deferred Assets Measurement Adjustment Total for all joint ventures Total for all joint ventures [member] Disclosure of other provisions [table] Disclosure of other provisions [table] Number of notes outstanding Number Of Notes Outstanding Number Of Notes Outstanding Credits for social security taxes Credits for Social Security Taxes [Member] Credits for Social Security Taxes [Member] Classes of financial instruments [domain] Classes of financial instruments [domain] Disclosure of detailed information about business combination [table] Disclosure of detailed information about business combination [table] Interest received Interest received, classified as operating activities Leases [Abstract] Leases1 [Abstract] Leases [Abstract] Vesting Based on TSR Compared To Peer Group, Ceiling Level Vesting Based on TSR Compared To Peer Group, Ceiling Level [Member] Vesting Based on TSR Compared To Peer Group, Ceiling Level Other post-employment benefits and other long-term employee benefits ("OPEB") Net periodic OPEB cost Other Post-Employment Benefit Plan [Member] Other Post-Employment Benefit Plan [Member] Items that cannot be recycled to the consolidated statements of operations Components of other comprehensive income that will not be reclassified to profit or loss, before tax [abstract] Potential extension options Lease Extension Option, Amount Lease Extension Option, Amount Products and services [domain] Products and services [domain] Schedule of Segment Reporting Information, by Segment Disclosure of operating segments [text block] EPS vs peer group, target Vesting Based on EPS Compared To Peer Group, Target Level [Member] Vesting Based on EPS Compared To Peer Group, Target Level [Member] €346.5m variable rate loan €346.5m Variable Rate Loan [Member] €346.5m Variable Rate Loan Corporate Income Tax (IRPJ and CSLL) Corporate Income Tax (IRPJ and CSLL) [Member] Corporate Income Tax (IRPJ and CSLL) Votorantim settlement expense Adjustments For Settlement Of Legal Dispute Adjustments For Votorantim Settlement Expense Recoverable Amount (Value in Use) Recoverable amount of asset or cash-generating unit Disclosure of Temporary Differences, Unused Tax Losses and Unused Tax Credits Disclosure of temporary difference, unused tax losses and unused tax credits [text block] Guarantees (in percent) Guarantee, Percentage Guarantee, Percentage Impairment of goodwill Impairment loss recognised in profit or loss, goodwill Share of other comprehensive income related to associates and joint ventures Share of: Share of other comprehensive income of associates and joint ventures accounted for using equity method, before tax [abstract] Disclosure of detailed information about intangible assets [table] Disclosure of detailed information about intangible assets [table] Borrowings Borrowings Money market funds Short-term investments, classified as cash equivalents Cases 11 - 13 Cases 11 - 13 [Member] Cases 11 - 13 Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination JPY 33 Billion Variable Rate Loan JPY 33 Billion Variable Rate Loan [Member] JPY 33 Billion Variable Rate Loan First opportunity First Opportunity [Member] First Opportunity Impairment loss recognised in profit or loss, property, plant and equipment Impairment loss recognised in profit or loss, property, plant and equipment Net cash provided by / (used in) financing activities Net cash provided by / (used in) financing activities Cash flows from (used in) financing activities Other (in percent) Other Instruments, Amount Contributed To Fair Value Of Plan Assets, Weighted-Average Allocation Percentage Other Instruments, Amount Contributed To Fair Value Of Plan Assets, Weighted-Average Allocation Percentage Total Total Income Tax Related To Items Credited (Charged) Directly To Equity And Other Comprehensive Income Total Income Tax Related To Items Credited (Charged) Directly To Equity And Other Comprehensive Income Counterparties [axis] Counterparties [axis] Consideration transferred, net of cash acquired Consideration Transferred, Acquisition-Date Fair Value, Net Of Cash Acquired Consideration Transferred, Acquisition-Date Fair Value, Net Of Cash Acquired Earnings per common share Description of accounting policy for earnings per share [text block] Deferred consideration Deferred Consideration Recognised As Of Acquisition Date Deferred Consideration Recognised As Of Acquisition Date Accumulated amortization and impairment losses Accumulated depreciation and impairment Accumulated depreciation, amortisation and impairment [member] Fair value of plan assets Plan assets, at fair value Treasury shares (13,874,181 and 84,263,150 common shares at December 31, 2025 and 2024, respectively, at cost) Treasury shares €25m fixed rate loan €25m Fixed Rate Loan [Member] €25m Fixed Rate Loan Other amounts due to public authorities Current Public Authorities Liabilities Current Public Authorities Liabilities Statement of changes in equity [table] Statement of changes in equity [table] Actuarial assumptions [axis] Actuarial assumptions [axis] Hera Ermac Hera Ermac [Member] Hera Ermac [Member] Other interest rate instruments Other Interest Rate Instruments [Member] Other Interest Rate Instruments System [Domain] System [Domain] System [Domain] Europe Europe Europe1 [Member] Europe [Member] CAD Canada, Dollars Short-term debt and current portion of long-term debt Total Short-term debt and current portion of long-term debt Current borrowings and current portion of non-current borrowings Total assets Identifiable Assets Recognised As Of Acquisition Date Identifiable Assets Recognised As Of Acquisition Date Classes of assets [domain] Classes of assets [domain] Types of hedges [domain] Types of hedges [domain] Debt assumed Borrowings recognised as of acquisition date Expenses of leases of low-value assets Expense relating to leases of low-value assets for which recognition exemption has been used Bottom of range Bottom of range [member] Payments received Decrease Through Payments Received, Contract Assets Decrease Through Payments Received, Contract Assets Reclassification adjustments on cash flow hedges for which hedged item affected profit or loss, before tax Reclassification Adjustments On Cash Flow Hedges For Which Hedged Item Affected Profit Or Loss, Before Tax Reclassification Adjustments On Cash Flow Hedges For Which Hedged Item Affected Profit Or Loss, Before Tax Categories of related parties [axis] Categories of related parties [axis] Derivatives Derivatives, Category [Member] Derivatives, Category [Member] Other facilities Other Facilities [Member] Other Facilities [Member] Net income (including non-controlling interests) Net income (including non-controlling interests) Net income (including non-controlling interests) Income (loss) from continuing operations Profit (loss) Coils Lamiere Nastri (C.L.N.) C.L.N. Coils Lamiere Nastri S.p.A. [Member] C.L.N. Coils Lamiere Nastri S.p.A. [Member] Derivative notional amount Derivative, Notional Amount1 Derivative, Notional Amount1 Total non-current liabilities Non-current liabilities Non-current liabilities Property, plant and equipment Property, plant and equipment recognised as of acquisition date Document registration statement Document Registration Statement Bonds, contractual cash flow Bonds issued, undiscounted cash flows SEGMENT REPORTING Disclosure of entity's operating segments [text block] Less than 180 days Less Than Six Months [Member] Less Than Six Months ArcelorMittal XCarb® ArcelorMital XCarb [Member] ArcelorMital XCarb Associate Total for all associates Total for all associates [member] Upstream Upstream [Member] Upstream AMTPI Arcelor Mittal Tubular Products (AMTP) [Member] Arcelor Mittal Tubular Products (AMTP) Present value of defined benefit obligation Present value of defined benefit obligation [member] Leases Description of accounting policy for leases [text block] Assets and liabilities not classified as held for sale Assets and liabilities not classified as held for sale [member] Contract duration period Slab Supply Contract Duration Period Slab Supply Contract Duration Period Disclosure of Sensitivity Analysis for Actuarial Assumptions Disclosure of sensitivity analysis for actuarial assumptions [text block] Disclosure of provision matrix [line items] Disclosure of provision matrix [line items] Business Contact Business Contact [Member] GBP United Kingdom, Pounds Bonds Bonds Bonds issued System [Axis] System [Axis] System Other Loans, Fixed/Floating, Due 2023-2033 Other Loans, Fixed/Floating, Due 2023-2033 [Member] Other Loans, Fixed/Floating, Due 2023-2033 Emission rights forward purchase contract Emission Rights Forward Purchase Contract [Member] Emission Rights Forward Purchase Contract Impact Of Climate Change And The Transition To A Low Carbon Economy [Abstract] Impact Of Climate Change And The Transition To A Low Carbon Economy [Abstract] Impact Of Climate Change And The Transition To A Low Carbon Economy Joint venture portion included in accrued expenses and liabilities Joint Venture Portion Included In Accrued Expenses and Liabilities Joint Venture Portion Included In Accrued Expenses and Liabilities Carrying amount Carrying amount [member] PSU / Executive Office PSUs and Executive Office Performance Share Units (PSU) and Executive Office [Member] Performance Share Units (PSU) and Executive Office Juros sobre o Capital Próprio Tax Effect Of Dividend Tax Deduction Tax Effect Of Dividend Tax Deduction Short-term performance-related bonus Key management personnel compensation, short-term employee benefits Security exchange name Security Exchange Name Current service cost Current service cost, defined benefit plans General Information About Financial Statements [Abstract] General Information About Financial Statements [Abstract] General Information About Financial Statements [Abstract] Investments in equity instruments at FVOCI Investments in equity instruments designated at fair value through other comprehensive income Individually assessed for credit losses Financial assets individually assessed for credit losses [member] Rate of compensation Actuarial assumption of expected rates of salary increases [member] 500 Unsecured Notes Five Hundred Million Unsecured Notes, Due 2054 [Member] Five Hundred Million Unsecured Notes, Due 2054 2025 Schuldschein loans 2025 Schuldschein Loans [Member] 2025 Schuldschein Loans ArcelorMittal Comercializadora de Energia ArcelorMittal Comercializadora de Energia [Member] ArcelorMittal Comercializadora de Energia [Member] Length connecting transmission line Length Connecting Transmission Line Length Connecting Transmission Line Term deposits Short-term deposits, classified as cash equivalents Total net assets Assets (liabilities) - Asset classes that do not have a quoted market price in an active market Level 2 and 3 of fair value hierarchy [member] Other Other Prepaid Expenses And Current Assets Other Prepaid Expenses And Current Assets Other liabilities Other Liabilities Recognised As Of Acquisition Date Other Liabilities Recognised As Of Acquisition Date Deferred tax assets, expected realisation of benefits Deferred Tax Assets, Expected Realisation Of Benefits Deferred Tax Assets, Expected Realisation Of Benefits Cash flow projection period Cash Flow Projection Period Cash Flow Projection Period Intangible assets Intangible assets other than goodwill [member] Disclosure of fair value of plan assets [table] Disclosure of fair value of plan assets [table] Deductions / Releases Reversal of inventory write-down Reclassification adjustments for loss (gain) included in the consolidated statements of operations and financial position (basis adjustments) Reclassification Adjustments On Change In Value Of Derivative Financial Instruments, Before Tax Reclassification Adjustments On Change In Value Of Derivative Financial Instruments, Before Tax Schedule of Geographical Areas Disclosure of geographical areas [text block] Provisions Provisions Related Temporary Differences [Member] Provisions Related Temporary Differences [Member] Restricted cash Current restricted cash and cash equivalents Increase (decrease) in pre-tax expense due to reasonably possible decrease in actuarial assumption Increase (Decrease) In Defined Benefit Plan Expense Due To Reasonably Possible Decrease In Actuarial Assumption Increase (Decrease) In Defined Benefit Plan Expense Due To Reasonably Possible Decrease In Actuarial Assumption Statistical Measurement [Domain] Statistical Measurement [Domain] Critical accounting policies Critical Accounting Policies [Policy Text Block] Critical Accounting Policies [Policy Text Block] Loans over 100, contractual cash flow Loans Over 100, Undiscounted Cash Flows Loans Over 100, Undiscounted Cash Flows ArcelorMittal France S.A.S. ArcelorMittal France S.A.S. [Member] ArcelorMittal France S.A.S. [Member] Current service cost Increase in net defined benefit liability (asset) resulting from current service cost Liabilities arising from financing activities [axis] Liabilities arising from financing activities [axis] Turkey TÜRKIYE ArcelorMittal Belgium N.V. ArcelorMittal Belgium N.V. [Member] ArcelorMittal Belgium N.V. [Member] Ukraine UKRAINE ArcelorMittal Hamburg GmbH ArcelorMittal Hamburg GmbH [Member] ArcelorMittal Hamburg GmbH [Member] Commitments related to purchases of raw materials and energy Purchase Commitments1 Purchase Commitments1 Expenses related to variable lease payments not included in the measurement of lease liabilities Expense relating to variable lease payments not included in measurement of lease liabilities GOODWILL, INTANGIBLE AND TANGIBLE ASSETS Disclosure Of Goodwill And Intangible Assets And Property, Plant And Equipment [Text Block] Disclosure Of Goodwill And Intangible Assets And Property, Plant And Equipment [Text Block] SCOPE OF CONSOLIDATION Disclosure of basis of consolidation [text block] Finocas Finocas NV (Belgium) [Member] Finocas NV (Belgium) Others ACIS [Member] ACIS [Member] Entity Addresses, Address Type [Axis] Entity Addresses, Address Type [Axis] Average contract duration (in years) Average Contract Duration Average Contract Duration Conflict of interest Conflict Of Interest [Member] Conflict Of Interest Other sales Other Sales [Member] Other Sales [Member] Property, plant and equipment Property, plant and equipment Property, plant and equipment Steel sales Steel Sales [Member] Steel Sales [Member] Others Tax Effect Of Other, Miscellaneous Tax Effect Of Other, Miscellaneous Equity Securities (in percent) Equity Instruments, Amount Contributed To Fair Value Of Plan Assets, Asset Target Allocation Percentage Equity Instruments, Amount Contributed To Fair Value Of Plan Assets, Asset Target Allocation Percentage Derivative financial liabilities, contractual cash flow Derivative financial liabilities, undiscounted cash flows Others Other Americas [Member] Other Americas [Member] Weighted average duration of defined benefit obligation Weighted average duration of defined benefit obligation Bamesa Bamesa [Member] Bamesa [Member] Level 1 - Asset classes that have a quoted market price in an active market Level 1 of fair value hierarchy [member] Disclosure of detailed information about property, plant and equipment [line items] Disclosure of detailed information about property, plant and equipment [line items] Romania ROMANIA EIB loan EIB Loan, Due 2025 [Member] EIB Loan, Due 2025 Undrawn borrowing facilities Undrawn borrowing facilities Capitalisation rate of borrowing costs eligible for capitalisation Capitalisation rate of borrowing costs eligible for capitalisation Biological assets Biological assets Dividends paid (includes 121, 187 and 162 of dividends paid to non-controlling shareholders in 2025, 2024 and 2023, respectively) Dividends paid, classified as financing activities Russia RUSSIAN FEDERATION Mining products Mining products [Member] Mining products [Member] Adjustments for differences in accounting policies and other Investments in Associates, Adjustments For Differences In Accounting Policies And Others Investments in Associates, Adjustments For Differences In Accounting Policies And Others Past service cost - Settlements Decrease (increase) in net defined benefit liability (asset) resulting from gains (losses) arising from settlements Environmental Other environment related provision Other environment related provision [member] Rest of Africa Rest of Africa [Member] Rest of Africa [Member] Basque Country in Spain and Luxembourg Basque Country In Spain and Luxembourg [Member] Basque Country In Spain and Luxemburg [Member] Reconciliation of changes in intangible assets and goodwill [abstract] Reconciliation of changes in intangible assets and goodwill [abstract] Others Other Europe [Member] Other Europe [Member] Environmental Remediation Site [Domain] Environmental Remediation Site1 [Domain] [Domain] for Environmental Remediation Site1 [Axis] Overdue 31-60 days Later than one month and not later than two months [member] Disposal group name [Domain] Disposal Group Name [Domain] [Domain] for Disposal Group Name [Axis] Mandatorily convertible unsecured unsubordinated bonds Mandatorily Convertible Unsecured Unsubordinated Bonds [Member] Mandatorily Convertible Unsecured Unsubordinated Bonds Deferred tax assets (liabilities) Deferred tax liability (asset) Number of performance targets Number of Performance Targets Number of Performance Targets Potential residual value guarantees Lease Residual Value Guarantee, Amount Lease Residual Value Guarantee, Amount Total current liabilities Current liabilities Current liabilities No later than ten years No Later Than Ten Years [Member] No Later Than Ten Years Cash dividends received by the Company Dividends received Non-cash market-to-market loss Non-Cash Market-to-Market Loss Non-Cash Market-to-Market Loss Schedule of Weighted-average Asset Allocations for the Funded Defined Benefit Pension Plans by Asset Category Schedule of weighted-average asset allocations for the funded defined benefit pension plans by asset category [Table Text Block] Schedule of weighted-average asset allocations for the funded defined benefit pension plans by asset category [Table Text Block] Individual assets or cash-generating units [axis] Individual assets or cash-generating units [axis] Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption Gain (loss) recognised as result of remeasuring to fair value equity interest in acquiree held by acquirer before business combination Gain (loss) recognised as result of remeasuring to fair value equity interest in acquiree held by acquirer before business combination Increase (decrease) in liabilities arising from financing activities Increase (decrease) through obtaining or losing control of subsidiaries or other businesses, liabilities arising from financing activities Votorantim S.A Votorantim S.A [Member] Votorantim S.A Disclosure of temporary difference, unused tax losses and unused tax credits [line items] Disclosure of temporary difference, unused tax losses and unused tax credits [line items] Other assets/Other long-term obligations Other Assets And Other Long-Term Obligations [Member] Other Assets And Other Long-Term Obligations [Member] Commodity contracts Commodities Commodity Contract1 [Member] Commodity Contract1 [Member] Environmental, social and governance ("ESG") Environmental, Social And Governance ("ESG") [Member] Environmental, Social And Governance ("ESG") Emission rights Other Intangible Assets, Emission Rights [Member] Other Intangible Assets, Emission Rights Statement of changes in equity [abstract] Statement of changes in equity [abstract] Retained earnings Retained earnings Measurement [domain] Measurement [domain] Cash acquired from acquisition Cash Acquired from Acquisition Cash Acquired from Acquisition Investments in equity instruments designated at fair value through other comprehensive income [Axis] Investments in equity instruments designated at fair value through other comprehensive income [axis] Unconsolidated structured entities [domain] Unconsolidated structured entities [domain] Deferred employee benefits Recognized liabilities Provisions for employee benefits Gonvarri Steel Industries Gonvarri Steel Industries [Member] Gonvarri Steel Industries [Member] Types of risks [domain] Types of risks [domain] Net loss on disposal of subsidiaries Gain (loss) on disposal Adjustments for gain (loss) on disposal of investments in subsidiaries, joint ventures and associates Nippon Steel Corporation (NSC) Nippon Steel Corporation (NSC) [Member] Nippon Steel Corporation (NSC) ESG, stretch Vesting Based On ESG, Stretch Level [Member] Vesting Based On ESG, Stretch Level Accounting estimates [domain] Accounting estimates [domain] Subsidiaries [axis] Subsidiaries [axis] Disclosure Of Entities Classified As Held For Sale Disclosure Of Entities Classified As Held For Sale [Table Text Block] Disclosure Of Entities Classified As Held For Sale Interest paid Interest paid, classified as operating activities Rate changes Tax effect from change in tax rate Tax effect from change in tax rate Geographical [Domain] Geographical [Domain] Company's share of net assets Share Of Net Assets (Liabilities) Share Of Net Assets (Liabilities) Reportable segments Description of accounting policy for segment reporting [text block] Tax Year 2008 2008 Tax Year [Member] Tax Year 2008 [Member] Net defined benefit liability (asset) [domain] Net defined benefit liability (asset) [domain] Prepayment on borrowings amount Borrowings, Prepayment Borrowings, Prepayment Other Investments Disclosure of investments other than investments accounted for using equity method [text block] Restricted cash Restricted cash Restricted cash and cash equivalents Liabilities arising from financing activities, beginning balance Liabilities arising from financing activities, ending balance Liabilities arising from financing activities Other liabilities Liabilities, Other [Member] Liabilities, Other Disputed Tax Assessments [Axis] Disputed Tax Assessments [Axis] Disputed Tax Assessments EAF capacity (in tonnes) EAF Capacity EAF Capacity Total share of other comprehensive income of associates and joint ventures accounted for using equity method, before tax Share of other comprehensive income of associates and joint ventures accounted for using equity method, before tax Category Of PSU [Axis] Category Of PSU [Axis] Category Of PSU Tranche B Tranche B [Member] Tranche B Entity common stock, shares outstanding (in shares) Entity Common Stock, Shares Outstanding Revenue, Cost Of Sales, Current Assets, And Current Liabilities [Abstract] Revenue, Cost Of Sales, Current Assets, And Current Liabilities [Abstract] Revenue, Cost Of Sales, Current Assets, And Current Liabilities [Abstract] Net debt Net debt Baffinland Baffinland [Member] Baffinland [Member] Schedule of Commitments Disclosure of Commitment Obligations [Table Text Block] Disclosure of Commitment Obligations [Table Text Block] Document Financial Statement Error Correction [Flag] Document Financial Statement Error Correction [Flag] Other Other Non-Current Liabilities, Other Other Non-Current Liabilities, Other Total non-current derivative liabilities (note 9.2) Derivative financial instruments (notes 6.1 and 6.3) Non-current derivative financial liabilities Disclosure of fair value measurement of assets [table] Disclosure of fair value measurement of assets [table] Disclosure of initial application of standards or interpretations [line items] Disclosure of initial application of standards or interpretations [line items] Enerfos Enerfos [Member] Enerfos [Member] Others Unallocated amounts [member] Financial instruments Financial Instruments Related Temporary Differences [Member] Financial Instruments Related Temporary Differences [Member] Property, plant and equipment, assets retired from active use and not classified as held for sale Property, plant and equipment, assets retired from active use and not classified as held for sale Joint operations [axis] Joint operations [axis] Disclosure of Transactions Between Related Parties Disclosure of transactions between related parties [text block] Total liabilities and equity Equity and liabilities Impairment of investments in associates, joint ventures and other investments Impairment charges Impairments of equity method investments Impairment Loss (Reversal Of Impairment Loss) Recognised In Profit Or Loss, Equity Method Investments Impairment Loss (Reversal Of Impairment Loss) Recognised In Profit Or Loss, Equity Method Investments United States UNITED STATES Effects of foreign exchange and other movements Increase (decrease) through net exchange differences, other provisions Settlement of Votorantim put option liability Payments For Settlement Of Put Option Liability Payments For Settlement Of Put Option Liability Capacity of hot strip mill facility Capacity Of Hot Strip Mill Facility Capacity Of Hot Strip Mill Facility Business combinations [domain] Business combinations [domain] Impairment of financial assets Description of accounting policy for impairment of financial assets [text block] Factored trade receivables Factored Trade Receivables Factored Trade Receivables 1.0 billion Unsecured Notes One Billion Unsecured Bonds, Due 2032 [Member] One Billion Unsecured Bonds, Due 2032 Tax Period [Axis] Tax Period1 [Axis] Tax Period [Axis] Disclosure of reconciliation of changes in property, plant and equipment, including right-of-use assets [line items] Disclosure of reconciliation of changes in property, plant and equipment, including right-of-use assets [line items] Joint ventures [domain] Joint ventures [domain] Investment in associates and joint ventures Description of accounting policy for investment in associates and joint ventures [text block] Number of loans Number Of Loans Number Of Loans Joint operations [domain] Joint operations [domain] Wind-down period postponed Wind-Down Period Postponed Wind-Down Period Postponed Accrued payroll and employee related expenses Short-term employee benefits accruals Changes in liabilities arising from financing activities [abstract] Changes in liabilities arising from financing activities [abstract] Other lease related expenses: Other Lease Related Expenses [Abstract] Other Lease Related Expenses Percentage applied to net debt in share price calculation Percentage Applied To Net Debt In Share Price Calculation Percentage Applied To Net Debt In Share Price Calculation Disclosure of net defined benefit liability (asset) [table] Disclosure of net defined benefit liability (asset) [table] USD United States of America, Dollars Restricted cash Description of accounting policy for restricted cash and cash equivalents [text block] Intangible assets Intangible Assets Related Temporary Differences [Member] Intangible Assets Related Temporary Differences Schedule of Permanent Items Schedule of Permanent Items [Table Text Block] Schedule of Permanent Items [Table Text Block] Disclosure of financial assets that are either past due or impaired [line items] Disclosure of financial assets that are either past due or impaired [line items] Cash disposed Cash and cash equivalents in subsidiary or businesses acquired or disposed Number of environmental charges Number Of Environmental Charges Number Of Environmental Charges Categories of financial liabilities [domain] Categories of financial liabilities [domain] Other movements Increase (decrease) through other changes, equity RELATED PARTIES Disclosure of related party [text block] Currency swaps purchase Currency Swap Purchase [Member] Currency Swap Purchase Samurai loan Samurai Loan [Member] Samurai Loan ESG, target Vesting Based On ESG, Target Level [Member] Vesting Based On ESG, Target Level Shareholder of Siderurgica Tres Lagoas Shareholder Of Siderurgica Tres Lagoas [Member] Shareholder Of Siderurgica Tres Lagoas [Member] Level 3 Level 3 of fair value hierarchy [member] Income tax relating to components of other comprehensive income Income tax relating to components of other comprehensive income Disposals Disposals, property, plant and equipment including right-of-use assets ArcelorMittal Duisburg GmbH ArcelorMittal Duisburg GmbH [Member] ArcelorMittal Duisburg GmbH [Member] EUR debt EUR Debt [Member] EUR Debt [Member] DHS Group DHS Group [Member] DHS Group Payments of long-term debt Repayments of non-current borrowings Schedule of Net Debt by Currency Disclosure Of Net Debt By Currency Explanatory [Table Text Block] Disclosure Of Net Debt By Currency Explanatory [Table Text Block] Current portion of long-term debt Increase (Decrease) Through Transfer, Liabilities Arising From Financing Activities Increase (Decrease) Through Transfer, Liabilities Arising From Financing Activities Gain (loss) recognised on measurement to fair value less costs to sell or on disposal of assets or disposal groups constituting discontinued operation Gain (loss) recognised on measurement to fair value less costs to sell or on disposal of assets or disposal groups constituting discontinued operation of which trade and other payables and provisions Trade And Other Payable And Provisions, Current Trade And Other Payable And Provisions, Current Impairment of financial assets [domain] Impairment of financial assets [domain] Commodity type [Axis] Commodity Type [Axis] Commodity Type [Axis] Al Jubail ArcelorMittal Tubular Products Al Jubail [Member] ArcelorMittal Tubular Products Al Jubail [Member] NSC Nippon Steel Corporation [Member] Nippon Steel Corporation [Member] Write backs / utilization Decrease through write-off, financial assets AMNS India ArcelorMittal Nippon Steel India Limited [Member] ArcelorMittal Nippon Steel India Limited[Member] Audit Information [Abstract] Audit Information Disclosure of disaggregation of revenue from contracts with customers [line items] Disclosure of disaggregation of revenue from contracts with customers [line items] Liabilities, net Liabilities, Net Liabilities, Net Operating Segments [Abstract] Operating Segments [Abstract] Operating Segments [Abstract] Areco Areco [Member] Areco Past due status [axis] Past due status [axis] Others Other Counterparties [Member] Other Counterparties [Member] Fair value of options, observable input, coupon yield Fair Value Of Options, Observable Input, Coupon Yield Fair Value Of Options, Observable Input, Coupon Yield Tameh Holding Tameh Holding (Tameh) [Member] Tameh Holding (Tameh) Second opportunity Second Opportunity [Member] Second Opportunity Number of shares forfeited (in shares) Number of shares, Forfeited (in shares) Number of other equity instruments forfeited in share-based payment arrangement Current tax expense (income), related to Pillar Two income taxes Current tax expense (income), related to Pillar Two income taxes Non-current liabilities: Non-current liabilities [abstract] Number of mandatorily convertible bonds outstanding Number Of Mandatorily Convertible Bonds Outstanding Number Of Mandatorily Convertible Bonds Outstanding Commitments within sureties, guarantees, LOC, pledges, and other collateral Commitments Within Sureties, Guarantees, LOC, Pledges, And Other Collateral Commitments Within Sureties, Guarantees, LOC, Pledges, And Other Collateral Finmasi Finmasi [Member] Finmasi South Africa SOUTH AFRICA ArcelorMittal Pecém ArcelorMittal Pecém (Formerly Companhia Siderúrgica do Pecém) [Member] ArcelorMittal Pecém (Formerly Companhia Siderúrgica do Pecém) €24.5m fixed rate loan €24.5m Fixed Rate Loan [Member] €24.5m Fixed Rate Loan Total for all cash-generating units Total for all cash-generating units [member] Number of joint ventures formed Number of Joint Ventures Formed Number of Joint Ventures Formed Receivables from public authorities Current Receivables From Public Authorities Current Receivables From Public Authorities Borrowings, extension option term Borrowings, Extension Option Term Borrowings, Extension Option Term Impairment on investments in associates, joint ventures and other investments Adjustment For Impairment On Investments In Associates, Joint Ventures And Other Investments Adjustment For Impairment On Investments In Associates, Joint Ventures And Other Investments of which trade and other payables, provisions and deferred tax liability Trade And Other Payable , Provisions, And Deferred Tax Liability, Noncurrent Trade And Other Payable , Provisions, And Deferred Tax Liability, Noncurrent Other taxes Tax Effect from Others Taxes Tax Effect from Others Taxes Disclosure of Detailed Information About Financial Instruments Disclosure of detailed information about financial instruments [text block] €310m variable rate loan €310m Variable Rate Loan [Member] €310m Variable Rate Loan Short-term borrowings interest rate (in percent) Current Borrowings, Interest Rate Current Borrowings, Interest Rate SINDIMETAL case SINDIMETAL Case [Member] SINDIMETAL Case [Member] Classes of other provisions [axis] Classes of other provisions [axis] Memorandum of agreement Memorandum Of Agreement [Member] Memorandum Of Agreement [Member] No later than seven years No Later Than Seven Years [Member] No Later Than Seven Years Share repurchase program, authorized, number of shares (in shares) Share Repurchase Program, Authorized, Number of Shares Number of share exchanged Number Of Share Exchanged Number Of Share Exchanged ArcelorMittal Las Truchas ArcelorMittal Las Truchas [Member] ArcelorMittal Las Truchas [Member] Useful life Useful Lives Or Depreciation Rates, Property, Plant And Equipment, Period Useful Lives Or Depreciation Rates, Property, Plant And Equipment, Period Exchange [Domain] Exchange [Domain] Sensitivity Analysis for Types of Market Risk Sensitivity analysis for types of market risk [text block] Transaction costs Transaction Costs Transaction Costs Derivative liabilities, fair value Derivative financial liabilities Derivative financial liabilities Disclosure of credit risk exposure [line items] Disclosure of credit risk exposure [line items] Disclosure of Defined Benefit Plans Disclosure of defined benefit plans [text block] Fully settled capital increase Fully Settled Capital Increase Fully Settled Capital Increase Overdue 91-180 days 3-6 months Later than three months and not later than six months [member] Number of tonnes at full capacity Number of Tonnes at Full Capacity Number of Tonnes at Full Capacity Movement in the Allowance for Lifetime Expected Credit Losses Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [text block] Liabilities held for sale Liabilities included in disposal groups classified as held for sale Gross amount Gross Cost Gross carrying amount [member] Trade accounts payable and other (including 352 and 291 to related parties at December 31, 2025 and 2024, respectively) Trade accounts payable and other Trade and other payables Trade and other current payables Applicable tax rate (in percent) Applicable tax rate Disclosure of employee benefits [Abstract] Disclosure of employee benefits [Abstract] Disclosure of employee benefits [Abstract] Climate Action Climate Action [Member] Climate Action Award date [Axis] Award Date1 [Axis] Award Date1 [Axis] 1 year or less 2026 Not later than one year [member] Total Europe Europe [Member] Current tax liabilities Current tax liabilities Total net assets disposed of Assets (Liabilities) Disposed Assets (Liabilities) Disposed Disclosure of dividends [Line Items] Dividends Payable1 [Line Items] [Line Items] for Dividends Payable1 [Table] Phase 2B Phase 2B [Member] Phase 2B Total liabilities Identifiable Liabilities Recognised As Of Acquisition Date Identifiable Liabilities Recognised As Of Acquisition Date Fair value recognized in profit or loss Financial liabilities at fair value through profit or loss, category [member] Special grant Special Grant [Member] Special Grant Components of Income Tax Expense (Benefit) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] [Table Text Block] for Schedule of Components of Income Tax Expense (Benefit) [Table] Transfer to assets held for sale (note 2.3) Increase (Decrease) Through Transfers From (To) Held For Sale, Property, Plant And Equipment Increase (Decrease) Through Transfers From (To) Held For Sale, Property, Plant And Equipment Long-term debt, net of current portion Total long-term debt Non-current portion of non-current borrowings Inventories Adjustments for decrease (increase) in inventories JPY 37.5 Billion Loan JPY 37.5 Billion Loan [Member] JPY 37.5 Billion Loan Disclosure of financial assets [line items] Disclosure of financial assets [line items] Property, plant and equipment Property, plant and equipment [member] OCI gross Other comprehensive income, before tax, hedges of net investments in foreign operations Liabilities incurred Liabilities incurred Tax claims Provision for taxes other than income tax [member] Property, plant and equipment Description of accounting policy for property, plant and equipment [text block] Consideration transferred, acquisition-date fair value Consideration transferred, acquisition-date fair value Payments of principal portion of lease liabilities (note 7) Lease payments recorded as reduction of lease liabilities and cash outflow from financing activities Payments of lease liabilities, classified as financing activities Total Americas Americas [Member] Acindar and Generación Eléctrica Argentina Renovable I S.A. ("GEAR I") Acindar and Generación Eléctrica Argentina Renovable I S.A. ("GEAR I") [Member] Acindar and Generación Eléctrica Argentina Renovable I S.A. ("GEAR I") 3.5 Billion ZAR revolving borrowing base finance facility, due in 2024 Three Point Five Billion South Africa Rand Revolving Borrowing Base Finance Facility, Due In 2024 [Member] Three Point Five Billion South Africa Rand Revolving Borrowing Base Finance Facility, Due In 2024 Raw materials Current raw materials Benefits paid Decrease (increase) in net defined benefit liability (asset) resulting from payments in respect of settlements Liquidity risk Liquidity risk [member] Diluted (in shares) Weighted average common shares outstanding (in millions) for the purposes of diluted earnings per share (in shares) Weighted average number of ordinary shares used in calculating diluted earnings per share Balance sheet location [Domain] Balance Sheet Location 1 [Domain] Balance Sheet Location 1 [Domain] Schedule of Additional Information About Leasing Activities for Lessee Disclosure of additional information about leasing activities for lessee [text block] Floating interest rate Floating interest rate [member] Pretoria Works Site Pretoria Works Site [Member] Pretoria Works Site [Member] ESG Vesting Based On ESG [Member] Vesting Based On ESG Retroactive application of new law Retroactive Application of New Law [Member] Retroactive Application of New Law [Member] Classes of intangible assets other than goodwill [domain] Classes of intangible assets other than goodwill [domain] Transactions with non-controlling interests Purchase Of Non-controlling Interests Purchase Of Non-controlling Interests Disclosure of joint ventures [line items] Disclosure of joint ventures [line items] Award vesting performance, stretch percentage (in percent) Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Performance Stretch Percentage Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Performance Stretch Percentage Classes of intangible assets and goodwill [axis] Classes of intangible assets and goodwill [axis] Recovery of financial impact Loss Contingency, Potential Recovery Amount Loss Contingency, Potential Recovery Amount Right to variable returns (in percent) Right to Variable Returns Right to Variable Returns Disclosure of Employees Total Annual Compensation Disclosure Of Employees Compensation Costs [Table Text Block] Disclosure of Employees Compensation Costs [Table Text Block] 5.5 billion revolving credit facility, due 2030 Five Point Five Billion Revolving Credit Facility, Due 2030 [Member] Five Point Five Billion Revolving Credit Facility, Due 2030 Ten percent increase in Hera Ermac share prices Ten Percent Increase In Hera Ermac Share Prices [Member] Ten Percent Increase In Hera Ermac Share Prices Percentage of rolling capacity Percentage Of Rolling Capacity Percentage Of Rolling Capacity Disclosure of Capital Management Disclosure Of Capital Management Explanatory [Table Text Block] Disclosure Of Capital Management Explanatory [Table Text Block] Net income attributable to non-controlling interests Profit (loss), attributable to non-controlling interests Equity: Equity [abstract] Other Other expenses, by nature Damages sought Loss Contingency, Damages Sought, Value1 Loss Contingency, Damages Sought, Value1 1.2 billion Unsecured Notes One Point Two Billion Unsecured Notes, Due 2027 [Member] One Point Two Billion Unsecured Notes, Due 2027 Actuarial assumption of life expectancy after retirement Actuarial assumption of life expectancy after retirement Guarantees, pledges and other collateral Guarantees, Pledges and Other Collateral Guarantees, Pledges and Other Collateral Term of collective labor agreement Defined Benefit Plan, Term of Agreement Defined Benefit Plan, Term of Agreement Bonds issued, maturity June 2054 Bonds Issued. Maturity June 2054 [Member] Bonds Issued. Maturity June 2054 Phase 2A Phase 2A [Member] Phase 2A Executive Chariman Executive Chariman [Member] Executive Chariman Adjustments for differences in accounting policies and other Investments In Joint Ventures, Adjustments For Differences In Accounting Policies And Others Investments In Joint Ventures, Adjustments For Differences In Accounting Policies And Others Assets and liabilities classified as held for sale Assets and liabilities classified as held for sale [member] 2031 - 2046 Tax Year 2031 Through 2046 [Member] Tax Year 2030 Through 2045 Advances received Advances received, representing contract liabilities for performance obligations satisfied at point in time Acquisitions Additions other than through business combinations, intangible assets other than goodwill Fair value recognized in OCI Financial assets at fair value through other comprehensive income, category [member] Share of other comprehensive gain (loss) related to associates and joint ventures Share Of Other Comprehensive Income (Loss) Related To Associates And Joint Ventures At Fair Value Other Comprehensive Income, Not Reclassified Share Of Other Comprehensive Income (Loss) Related To Associates And Joint Ventures At Fair Value Other Comprehensive Income, Not Reclassified Ten percent decrease in forward prices Ten Percent Decrease In Forward Prices [Member] Ten Percent Decrease In Forward Prices Share Capital, Reserves And Other Equity Interest [Abstract] Share Capital, Reserves And Other Equity Interest [Abstract] Share Capital, Reserves And Other Equity Interest [Abstract] Capacity of rolled products Capacity Of Rolled Products Capacity Of Rolled Products CFL Cargo CFL Cargo S.A. [Member] CFL Cargo S.A. [Member] Inventories Inventories Related Temporary Differences [Member] Inventories Related Temporary Differences [Member] Disclosure of temporary difference, unused tax losses and unused tax credits [table] Disclosure of temporary difference, unused tax losses and unused tax credits [table] Unfavorable contracts Other Non-Current Liabilities, Unfavorable Contracts Other Non-Current Liabilities, Unfavorable Contracts Other Other Assets, Miscellaneous, Noncurrent1 Other Assets, Miscellaneous, Noncurrent1 Basis adjustment Gain (loss) on change in fair value of hedging instrument used as basis for recognising hedge ineffectiveness 5.146 billion term loan, due 2030 Five Point One Four Six Billion Term Loan, Due 2030 [Member] Five Point One Four Six Billion Term Loan, Due 2030 Third opportunity Third Opportunity [Member] Third Opportunity Auditor firm ID Auditor Firm ID Post-employment benefits Key management personnel compensation, post-employment benefits Types of contracts [axis] Types of contracts [axis] Other investments Other Investments [Policy Text Block] Other Investments Disclosure Of Non-current Assets Held For Sale And Discontinued Operations [Line Items] Disclosure Of Non-current Assets Held For Sale And Discontinued Operations [Line Items] Disclosure Of Non-current Assets Held For Sale And Discontinued Operations [Line Items] Trade payables subject to early payment discount Trade Payables Subject To Early Payment Discount Trade Payables Subject To Early Payment Discount Income of acquiree since acquisition date Profit (loss) of acquiree since acquisition date Disclosure Of Non-current Assets Held For Sale And Discontinued Operations [Table] Disclosure Of Non-current Assets Held For Sale And Discontinued Operations [Table] Disclosure Of Non-current Assets Held For Sale And Discontinued Operations [Table] Disclosure of subsidiaries [table] Disclosure of subsidiaries [table] Capital increase ArcelorMittal Liberia (note 11.5.1) Capital increase in AM Liberia on behalf of the government of Liberia Capital increase in AM Liberia on behalf of the government of Liberia Total Corporate Corporate Borrowings [Member] Corporate Borrowings [Member] CEO Chief Executive Officer1 [Member] Chief Executive Officer [Member] Title of individual Title and Position [Axis] Reasonably possible increase in risk variable, impact on equity Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Increase In Risk Variable, Impact On Equity Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Increase In Risk Variable, Impact On Equity EPS vs peer group, threshold Vesting Based on EPS Compared To Peer Group, Threshold Level [Member] Vesting Based on EPS Compared To Peer Group, Threshold Level [Member] Settlement payment Loss Contingency, Settlement Payment Loss Contingency, Settlement Payment Integrated Metal Recycling Integrated Metal Recycling [Member] Integrated Metal Recycling Decrease in average selling price (change in %)1 Decrease In Average Selling Price Decrease In Average Selling Price Hedge accounting policy Description of accounting policy for hedging [text block] Borrowings maturity, term Borrowings Maturity, Term Borrowings Maturity, Term Schedule of Other Assets Schedule Of Other Assets, Noncurrent1 [Table Text Block] Schedule Of Other Assets, Noncurrent Gain (loss) arising during the period Other comprehensive income, before tax, gains (losses) from investments in equity instruments Property, plant and equipment and biological assets Property, plant and equipment including right-of-use assets at beginning of period Property, plant and equipment including right-of-use assets ending balance Property, plant and equipment including right-of-use assets Fair Value Financial liabilities, at fair value Increase (decrease) through derecognition of DTA on losses and deductible temporary differences Increase (Decrease) Through Derecognition Of DTA on Losses And Deductible Temporary Differences, Deferred Tax Liability (Asset) Increase (Decrease) Through Derecognition Of DTA on Losses And Deductible Temporary Differences, Deferred Tax Liability (Asset) Consideration Transferred [Axis] Consideration Transferred [Axis] Consideration Transferred Number of treasury shares cancelled (in shares) Number Of Treasury Shares Cancelled Number Of Treasury Shares Cancelled Top of range Top of range [member] ArcelorMittal Eisenhüttenstadt GmbH ArcelorMittal Eisenhüttenstadt GmbH [Member] ArcelorMittal Eisenhüttenstadt GmbH [Member] PLN Poland, Zlotych Schedule of Inventories Schedule Of Inventory, Current1 [Table Text Block] Schedule Of Inventory, Current1 Tranche A Tranche A [Member] Tranche A Scenario [Axis] Scenario [Axis] Other assets Total Other non-current assets Deferred tax Income tax relating to hedges of net investments in foreign operations included in other comprehensive income Increase in commitments related to raw materials and energy Increase in Commitments Related To Raw Materials and Energy Increase in Commitments Related To Raw Materials and Energy 2019-2020 Tax Period 2019 To 2020 Tax Period [Member] 2019 To 2020 Tax Period ArcelorMittal Calvert LLC ArcelorMittal Calvert LLC [Member] ArcelorMittal Calvert LLC [Member] Disclosure of Information About Terms and Conditions of Cash Flow Hedges Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [text block] Payable from acquisition of financial assets Consideration Payable, Non-Current Consideration Payable, Non-Current Serra Azul Mine, Brazil Serra Azul Mine, Brazil [Member] Serra Azul Mine, Brazil Aggregated individually immaterial associates Aggregated individually immaterial associates [member] Inventories Description of accounting policy for measuring inventories [text block] Accounting estimates [axis] Accounting estimates [axis] Receivables from sale of intangible, tangible and financial assets Current Receivables From Sale Of Intangible, Tangible And Financial Assets Current Receivables From Sale Of Intangible, Tangible And Financial Assets Write-downs of inventories to net realizable value, provisions and other non-cash operating expenses net Adjustment For Write-Downs (Reversal) Of Inventories To Net Realizable Value, Provisions And Non-Cash Items Adjustment For Write-Downs (Reversal) Of Inventories To Net Realizable Value, Provisions And Non-Cash Items Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Gain (loss) on settlement of pre-existing relationships Gain (Loss) On Settlement Of Pre-Existing Relationships Gain (Loss) On Settlement Of Pre-Existing Relationships Present value of the wholly or partly funded obligation Present value of the wholly or partly funded obligation Defined benefit obligation, at present value Other Other related parties [member] Currency risk Currency risk [member] Overdue 61-90 days Later than two months and not later than three months [member] Impairment Impairment charges (note 3.1) Impairment (note 5.3) Impairment Impairment loss (reversal of impairment loss) recognised in profit or loss Sales Revenue from contracts with customers Revenue Revenue from contracts with customers Taxable reversals of (tax deductible) write-downs on shares and receivables Tax Effect Of Unrecognized Deferred Tax Assets On Write-Downs Of Value of Shares and Receivables Tax Effect Of Unrecognized Deferred Tax Assets On Write-Downs Of Value of Shares and Receivables Accordion feature, higher borrowing capacity option Borrowing Facilities, Accordion Feature, Higher Borrowing Capacity Option Borrowing Facilities, Accordion Feature, Higher Borrowing Capacity Option Foreign exchange and others Increase (decrease) through foreign exchange, financial assets Exchange options sales Exchange Option Sales [Member] Exchange Option Sales [Member] Collective labor agreement Collective Labor Agreement [Member] Collective Labor Agreement [Member] Other comprehensive income (loss) Other comprehensive income (loss) Other comprehensive income Classes of liabilities [axis] Classes of liabilities [axis] Gain (loss) on derivative financial instruments Reserve of gains and losses on hedging instruments that hedge investments in equity instruments [member] Counterparties [domain] Counterparties [domain] Past due status [domain] Past due status [domain] Proportion of voting rights held in associate (in percent) Proportion of voting rights held in associate Types of share-based payment arrangements [axis] Types of share-based payment arrangements [axis] Depreciation and amortization Adjustments for depreciation and amortisation expense Forecast Forecast [Member] Status [Axis] Status [Axis] Status Title of 12(b) security Title of 12(b) Security Joint Venture Joint ventures where entity is venturer [member] Duration of reasonably possible increase in actuarial assumption Duration Of Reasonably Possible Increase In Actuarial Assumption Duration Of Reasonably Possible Increase In Actuarial Assumption Commodity type [Domain] Commodity Type [Domain] [Domain] for Commodity Type [Axis] Loans interest rate (in percent) Loans Receivable, Related Party, Interest Rate Loans Receivable, Related Party, Interest Rate Number of shares authorized for grant (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized ArcelorMittal Mining Canada G.P. and ArcelorMittal Infrastructure Canada G.P. ("AMMC") AMMC ArcelorMittal Mining Canada G.P. and ArcelorMittal Infrastructure Canada G.P. ("AMMC") [Member] ArcelorMittal Mining Canada G.P. and ArcelorMittal Infrastructure G.P. [Member] Provision of guarantees or collateral by entity, related party transactions Provision of guarantees or collateral by entity, related party transactions Executive Office and CFO Plan Executive Office and CFO Plan [Member] Executive Office and CFO Plan Tranche C Tranche C [Member] Tranche C Operational readiness Operational Readiness [Member] Operational Readiness Derivative financial current liabilities Derivative financial liabilities, current [Member] Derivative financial liabilities, current [Member] Total (in percent) Plan Assets At Fair Value, Allocation Percentage Plan Assets At Fair Value, Allocation Percentage Mining activities Mining activities [Member] Mining activities Income from continuing operations Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method Proportion of voting rights held in subsidiary Proportion of voting rights held in subsidiary Reasonably possible decrease in risk variable, impact on income Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Decrease In Risk Variable, Impact On Income Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Decrease In Risk Variable, Impact On Income Depreciation charge for the year Depreciation, property, plant and equipment including right-of-use assets Disclosure of financial assets and liabilities [Table] Disclosure Of Financial Assets And Liabilities [Table] Disclosure Of Financial Assets And Liabilities [Table] Subsidiaries [domain] Subsidiaries [domain] Financial liabilities Financial Liabilities1 [Member] Financial Liabilities1 [Member] Galvanization annual capacity (in tonnes) Galvanization Annual Capacity Galvanization Annual Capacity Exposure to Credit Risk by Reportable Segment Disclosure of credit risk exposure [text block] Borrowings by name [axis] Borrowings by name [axis] Administrative costs Increase (decrease) in net defined benefit liability (asset) resulting from administration costs not reflected in return on plan assets Vesting Based On Performance Of ROCE, Threshold Level Vesting Based On Performance Of ROCE, Threshold Level [Member] Vesting Based On Performance Of ROCE, Threshold Level Financial Information of Subsidiaries with Material Non-controlling Interests Disclosure Of Financial Information Of Subsidiaries With Material Noncontrolling Interests Explanatory [Table Text Block] Disclosure Of Financial Information Of Subsidiaries With Material Noncontrolling Interests Explanatory [Table Text Block] Number of installments of dividends Number Of Installments Of Dividends Number Of Installments Of Dividends Fair value per share, Outstanding, beginning balance (USD per share) Fair value per share, Outstanding, ending balance (USD per share) Other Equity Instruments Outstanding In Share-based Payment Arrangement, Fair Value Price Per Share Other Equity Instruments Outstanding In Share-based Payment Arrangement, Fair Value Price Per Share Baycoat Baycoat Limited Partnership [Member] Baycoat Limited Partnership [Member] Asset retirement obligations Asset retirement obligations Asset Retirement Obligations [Member] Asset Retirement Obligations [Member] Borrowings Description of accounting policy for borrowings [text block] Performance of ROCE, target Vesting Based On Performance Of ROCE, Target Level [Member] Vesting Based On Performance Of ROCE And Gap To Competition, Target Level [Member] Other comprehensive income, before tax, gains (losses) on remeasurements of defined benefit plans Other Comprehensive Income, Before Tax, Gains (Losses) On Remeasurements Of Defined Benefit Plans, Net Of Share Related To Associates And Joint Ventures Other Comprehensive Income, Before Tax, Gains (Losses) On Remeasurements Of Defined Benefit Plans, Net Of Share Related To Associates And Joint Ventures FINANCING AND FINANCIAL INSTRUMENTS Disclosure of financial instruments [text block] Ten percent increase in forward prices Ten Percent Increase In Forward Prices [Member] Ten Percent Increase In Forward Prices Classes of intangible assets and goodwill [domain] Classes of intangible assets and goodwill [domain] Assets carrying amount Hedging instrument, assets Forward sale contracts Forward Sales Contract [Member] Forward Sales Contract [Member] Present value of the unfunded obligation Unfunded Defined Benefit Obligation, At Present Value Unfunded Defined Benefit Obligation, At Present Value Impairment Loss Impairment Loss [Member] Impairment Loss ArcelorMittal España S.A. ArcelorMittal España S.A. [Member] ArcelorMittal España S.A. [Member] Vesting [Axis] Vesting1 [Axis] Vesting [Axis] Disclosure of detailed information about intangible assets [line items] Disclosure of detailed information about intangible assets [line items] Associates Carrying amount in the statements of financial position Investments in associates accounted for using equity method Investments in associates accounted for using equity method Non-controlling interests Non-controlling interest in acquiree recognised at acquisition date Reclassification adjustments for loss included in the consolidated statements of operations Reclassification adjustments on exchange differences on translation of foreign operations, before tax Non-financial liabilities Non-Financial Liabilities [Member] Non-Financial Liabilities [Member] Share of other comprehensive income (expense) related to associates and joint ventures Share Of Other Comprehensive Expense (Income), Before Tax, Gains (Losses) On Remeasurements Of Defined Benefit Plans Share Of Other Comprehensive Expense (Income), Before Tax, Gains (Losses) On Remeasurements Of Defined Benefit Plans Put option liability Payable For Put Option Liability Payable For Put Option Liability Italpannelli Italpannelli SRL [Member] Italpannelli SRL Change in fair value Gains (losses) recognised in profit or loss including exchange differences, fair value measurement, liabilities €310m Loan €310m Loan [Member] €310m Loan Long Products South Africa Long Products South Africa [Member] Long Products South Africa Non-current assets Non-current Assets [Member] Non-current Assets Dabuna-Paradeep system Dabuna-Paradeep System [Member] Dabuna-Paradeep System Crude steel capacity Crude Steel Capacity Crude Steel Capacity Disclosure of transactions between related parties [table] Disclosure of transactions between related parties [table] Reasonable possible increase in risk variable, derivatives Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Increase In Risk Variable, Derivatives Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Increase In Risk Variable, Derivatives Types of hedges [axis] Types of hedges [axis] Authorised share capital Authorised Share Capital Authorised Share Capital Attribution of expenses by nature to their function [axis] Attribution of expenses by nature to their function [axis] EPS vs peer group Vesting Based on EPS Compared To Peer Group [Member] Vesting Based on EPS Compared To Peer Group Trade receivables recognised as of acquisition date Trade Receivables Recognised As Of Acquisition Date Trade Receivables Recognised As Of Acquisition Date 4-5 years Later than three years and not later than five years [member] Grant date December 5, 2025, Maturity due December 2028 Grant date December 5, 2025, Maturity due December 2028 [Member] Grant date December 5, 2025, Maturity due December 2028 Income from subleasing right-of-use assets Income from subleasing right-of-use assets Total Equity Components of equity [domain] Dividend (notes 11.4 and 11.5) Dividends recognised as distributions to owners Financial assets Financial Assets1 [Member] Financial Assets1 [Member] Disclosure of operating segments [line items] Disclosure of operating segments [line items] Total Employee Expense Employee Expense Weighted average Weighted average [member] Treasury share repurchase program, authorised no of shares (in shares) Treasury Share Repurchase Program, Authorised Number of Shares Treasury Share Repurchase Program, Authorised Number of Shares Unallocated assets Unallocated Assets Unallocated Assets Settlement of trade payables Settlement of Trade Payables [Member] Settlement of Trade Payables Gap to competition Vesting Based on Gap To Competition [Member] Vesting Based on Gap To Competition Defined contribution plan, cash contributions paid Defined Contribution Plan, Cash Contributions Paid Defined Contribution Plan, Cash Contributions Paid Deductions/ Payments Provision used, other provisions Range [domain] Range [domain] Threshold carrying amount of individually immaterial joint ventures and associates Threshold Carrying Amount Of Individually Immaterial Joint Ventures And Associates Threshold Carrying Amount Of Individually Immaterial Joint Ventures And Associates AMTPI Arcelor Mittal Tubular Products Lasi (AMTPI) [Member] Arcelor Mittal Tubular Products Lasi (AMTPI) Future taxable income required Deferred Tax Assets, Future Taxable Income Required Deferred Tax Assets, Future Taxable Income Required Number of employees impacted Number Of Employees Impacted Number Of Employees Impacted Interest income Interest income Interest income Tax contingencies/settlements Tax Effect Of Tax Contingency And Tax Settlement Tax Effect Of Tax Contingency And Tax Settlement Scenario [Domain] Scenario [Domain] Other Other Other Currencies [Member] Other Currencies [Member] Trade payables Amounts payable, related party transactions Financial amounts receivable Financial Amounts Receivable, Non-current Financial Amounts Receivable, Non-current Number of tax assessments or claims filed Loss Contingency, New Claims Filed, Number1 Loss Contingency, New Claims Filed, Number1 Disclosure of products and services [table] Disclosure of products and services [table] AMNS Luxembourg AMNS Luxembourg [Member] AMNS Luxembourg Excess of recoverable amount over carrying amount Amount by which unit's recoverable amount exceeds its carrying amount RSUs Restricted Share Units (RSU) [Member] Restricted Share Units (RSU) [Member] Address Type [Domain] Address Type [Domain] Notional amount Notional amount Unconsolidated structured entities [axis] Unconsolidated structured entities [axis] Unrealized Gains (Losses) on Derivative Financial Instruments relating to CFH Reserve of cash flow hedges [member] 2010 revolving multi-currency letter of credit facility Two Thousand And Ten Revolving Multi-currency Letter Of Credit Facility [Member] Two Thousand And Ten Revolving Multi-currency Letter Of Credit Facility [Member] Lease obligations Current lease liabilities Purchases from related parties Purchases Purchases of goods, related party transactions Others Other Investment Issuers [Member] Other Investment Issuers [Member] Exchange differences arising on translation of foreign operations: Exchange differences on translation [abstract] Share buyback Share buyback Payments For Repurchase Of Equity1 Payments For Repurchase Of Equity1 UAH Ukraine, Hryvnia Diluted (USD per share) Diluted earnings (loss) per share Maturity [domain] Maturity [domain] AM Green Energy India Private Limited ArcelorMittal AM Green Energy India Private Limited [Member] ArcelorMittal AM Green Energy India Private Limited Mittal Steel Mittal Steel [Member] Mittal Steel Disclosure Of Potential Exposure To Future Cash Outflows Not Reflected In Measurement Of Lease Liability [Table] Disclosure Of Potential Exposure To Future Cash Outflows Not Reflected In Measurement Of Lease Liability [Table] Disclosure Of Potential Exposure To Future Cash Outflows Not Reflected In Measurement Of Lease Liability [Table] Categories of financial liabilities [axis] Categories of financial liabilities [axis] Disclosure of reconciliation of liabilities arising from financing activities [table] Disclosure of reconciliation of liabilities arising from financing activities [table] No later than five years No Later Than Five Years [Member] No Later Than Five Years Disclosure of associates [line items] Disclosure of associates [line items] Counterparty Name [Axis] Counterparty Name [Axis] Number of operations Number of Operations Number of Operations Entity incorporation, state or country code Entity Incorporation, State or Country Code €600 million Unsecured Notes Six Hundred Million EUR Unsecured Notes, Due 2026 [Member] Six Hundred Million EUR Unsecured Notes, Due 2026 Gains or losses reclassification adjustment and hedge ineffectiveness Reclassification adjustments on cash flow hedges, before tax Subsequent Exercise Option [Axis] Subsequent Exercise Option [Axis] Subsequent Exercise Option Tax decision Tax Decision [Member] Tax Decision Number of energy production facilities Associates, Number Of Energy Production Facilities Associates, Number Of Energy Production Facilities Interest expense Interest expense Interest expense Disclosure of geographical areas [line items] Disclosure of geographical areas [line items] Potential purchase commitment Potential Purchase Commitments Potential Purchase Commitments Entity Listings, Exchange [Axis] Entity Listings, Exchange [Axis] 2027 Tax Year 2027 [Member] Tax Year 2027 Income statement location [Axis] Income Statement Location1 [Axis] Income Statement Location1 [Axis] Increase (decrease) in fair value of call options from electricity forward price volatility Increase (Decrease) In Fair Value Of Call Options From Electricity Forward Price Volatility Increase (Decrease) In Fair Value Of Call Options From Electricity Forward Price Volatility Dividends paid Dividends paid, ordinary shares Disclosure of detailed information about business combination [line items] Disclosure of detailed information about business combination [line items] Temporary differences related to investments in subsidiaries, associates and joint ventures Temporary Differences Related To Investments In Subsidiaries, Associates And Joint Ventures [Member] Temporary Differences Related To Investments In Subsidiaries, Associates And Joint Ventures [Member] Disputed Tax Assessments [Domain] Disputed Tax Assessments [Domain] Disputed Tax Assessments [Domain] Assets and liabilities [domain] Assets and liabilities [domain] Reasonably possible change in risk variable (in percent) Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Change In Risk Variable, Percent Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Change In Risk Variable, Percent Derivative contract, equity method investments Derivative Contract, Equity Method Investments [Member] Derivative Contract, Equity Method Investments Tax settlement payment period Tax Settlement Payment Period Tax Settlement Payment Period Accrued expenses and other liabilities Accrued expenses and other liabilities Current accrued expenses and other current liabilities Number of contracts Number of Contracts Number of Contracts 2028 Later than two years and not later than three years [member] Basis of consolidation Description of Accounting Policy For Basis Of Consolidation [Policy Text Block] Description of Accounting Policy For Basis Of Consolidation [Policy Text Block] Cash and cash equivalents: Cash and cash equivalents [abstract] Deferred tax liabilities Deferred tax liabilities recognised as of acquisition date Reconciliation of Liabilities Arising from Financing Activities Disclosure of reconciliation of liabilities arising from financing activities [text block] Consideration Net sales proceeds Portion Of Consideration Paid (Received) Consisting Of Cash And Cash Equivalents, Net Of Escrow Deposit And Cash Disposed Portion Of Consideration Paid (Received) Consisting Of Cash And Cash Equivalents, Net Of Escrow Deposit And Cash Disposed Others Total Other tax effects for reconciliation between accounting profit and tax expense (income) Entity Addresses [Table] Entity Addresses [Table] Total Asia & Africa Total Asia & Africa Asia and Africa [Member] Asia and Africa [Member] Financing costs - net Total Financing costs - net Finance income (cost) Fair value measurement Description of accounting policy for fair value measurement [text block] Disclosure of detailed information about borrowings [table] Disclosure of detailed information about borrowings [table] Mandatorily convertible bond extension (note 11.2) Increase (Decrease) Through Extension of Convertible Instruments, Equity Increase (Decrease) Through Extension of Convertible Instruments, Equity Disclosure of sensitivity analysis for actuarial assumptions [line items] Disclosure of sensitivity analysis for actuarial assumptions [line items] Consideration paid (received) net of cash disposed of Consideration Paid (Received) Net Of Cash Disposed Of Consideration Paid (Received) Net Of Cash Disposed Of Competition and antitrust claims Competition and Antitrust Claims [Member] Competition and Antitrust Claims [Member] Statement of changes in equity [line items] Statement of changes in equity [line items] Treasury shares (in shares) Treasury shares, beginning of period (in shares) Treasury shares, end of period (in shares) Number Of Treasury Shares Number Of Treasury Shares Tangible assets Tangible Assets [Member] Tangible Assets [Member] Total comprehensive income attributable to: Comprehensive income attributable to [abstract] ArcelorMittal Brasil S.A. ArcelorMittal Brasil S.A. ArcelorMittal Brasil S.A. [Member] ArcelorMittal Brasil S.A. [Member] Disclosure of geographical areas [table] Disclosure of geographical areas [table] Fair value recognized in profit or loss Financial assets at fair value through profit or loss, category [member] TSR vs performance index, target Vesting Based on TSR Compared To Performance Index, Target Level [Member] Vesting Based on TSR Compared To Performance Index, Target Level [Member] Not past due Current [member] Foreign exchange differences and other movements Increase (decrease) through net exchange differences, intangible assets and goodwill Statement of financial position [abstract] Statement of financial position [abstract] Shares acquired in associate held by entity (in shares) Number Of Shares Acquired In Transaction Number Of Shares Acquired In Transaction 3 Billion ZAR revolving borrowing base finance facility, due in 2027 Three Billion South Africa Rand Revolving Borrowing Base Finance Facility, Due In 2027 [Member] Three Billion South Africa Rand Revolving Borrowing Base Finance Facility, Due In 2027 Other movements Increase (decrease) through other changes, property, plant and equipment including right-of-use assets Cover [Abstract] Maximum Maximum [Member] Basis of presentation Explanation Of Measurement Bases Used In Preparing Financial Statements [Text Block] Explanation Of Measurement Bases Used In Preparing Financial Statements Dividends paid to non-controlling shareholders Dividend to non-controlling interests Dividends paid to non-controlling interests Receivables from sale of intangible, tangible and financial assets Non-current Receivables From Sale Of Intangible, Tangible And Financial Assets Non-current Receivables From Sale Of Intangible, Tangible And Financial Assets Unused provision reversed, other provisions Unused provision reversed, other provisions Debottlenecking Debottlenecking [Member] Debottlenecking Non-cash acquisition of joint venture equity Non-cash Acquisition of Joint Venture Equity Non-cash Acquisition of Joint Venture Equity Disclosure of sensitivity analysis for actuarial assumptions [table] Disclosure of sensitivity analysis for actuarial assumptions [table] Stalprodukt S.A. Stalprodukt SA [Member] Stalprodukt SA [Member] No later than eight years No Later Than Eight Years [Member] No Later Than Eight Years Status [Domain] Status [Domain] Status [Domain] Entity shell company Entity Shell Company Disclosure of joint operations [table] Disclosure of joint operations [table] Unrecognized deferred tax liabilities Temporary differences associated with investments in subsidiaries, branches and associates and interests in joint arrangements for which deferred tax liabilities have not been recognised MXN Mexico, Pesos Classes of liabilities [domain] Classes of liabilities [domain] Interest expense   Adjustments for interest expense Production in process Current work in progress Revenue from contracts with customers located in Ukraine Revenue From Contracts With Customers Located In Ukraine Revenue From Contracts With Customers Located In Ukraine Change in unrecoverable surplus Surplus (deficit) in plan [abstract] Current liabilities recognised as of acquisition date Current liabilities recognised as of acquisition date Document fiscal period focus Document Fiscal Period Focus Cash at bank Balances with banks Total assets Total assets Assets Mining  Assets Mining assets [member] Litigation Case [Domain] Litigation Case [Domain] Gain (loss) arising during the period Gains (losses) on exchange differences on translation of foreign operations, before tax Associates [domain] Associates [domain] Casa dos Ventos Casa dos Ventos [Member] Casa dos Ventos Number of shares outstanding (in shares) Number of shares, Outstanding, beginning balance (in shares) Number of shares, Outstanding, ending balance (in shares) Number of other equity instruments outstanding in share-based payment arrangement Business combinations Description of accounting policy for business combinations [text block] Total current tax expense 1 Current tax expense (income) and adjustments for current tax of prior periods Investment, Name [Domain] Investment, Name [Domain] Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Table] Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Table] Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Table] Rest of Asia Rest of Asia [Member] Rest of Asia [Member] Trade receivables Amounts receivable, related party transactions Types of interest rates [axis] Types of interest rates [axis] Revenue Revenue Entity address, city or town Entity Address, City or Town 10% decrease, trade payables Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Change In Risk Variable, Ten Percent Decrease, Impact On Trade Payables Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Change In Risk Variable, Ten Percent Decrease, Impact On Trade Payables Assets held for sale Non-current assets or disposal groups classified as held for sale or as held for distribution to owners Share Capital Issued capital Issued capital [member] TSR vs peer group, target Vesting Based on TSR Compared To Peer Group, Target Level [Member] Vesting Based on TSR Compared To Peer Group, Target Level [Member] Expected reduction in CO2 (in tonnes) Expected Reduction In CO2 Expected Reduction In CO2 Disclosure of Information About Key Management Personnel Disclosure of information about key management personnel [text block] Electricity option Option contract [member] Executive Officers Plan Executive Officers Plan [Member] Executive Officers Plan [Member] Impairment of receivables (net of write backs and utilization) Net Increase (Decrease) Through (Impairment) Reversal Of Impairment And Utilization, Receivables Net Increase (Decrease) Through (Impairment) Reversal Of Impairment And Utilization, Receivables Selling, general and administrative expenses Selling, general and administrative expense [member] Disclosure of quantitative information about right-of-use assets [table] Disclosure of quantitative information about right-of-use assets [table] Entity emerging growth company Entity Emerging Growth Company Number of operating and reportable segments Number Of Operating and Reportable Segments Number Of Operating and Reportable Segments Number of kilometers pipeline constructed Number Of Kilometers Pipeline Constructed Number Of Kilometers Pipeline Constructed Iron Ore Iron Ore [Member] Iron Ore [Member] Staff related obligations Staff Related Obligations [Member] Staff Related Obligations [Member] Trade accounts receivable, prepaid expenses and other current assets Trade Accounts Receivable, Prepaid Expenses And Other Current Assets Trade Accounts Receivable, Prepaid Expenses And Other Current Assets Potential variable lease payments Estimated Variable Lease, Payment Estimated Variable Lease, Payment Trade accounts payables and other Description of accounting policy for trade and other payables [text block] Other comprehensive income that will not be reclassified to profit or loss, before tax Fair Value Through Other Comprehensive Income Held Which Cannot Be Reclassified To The Statement of Operations, Before Tax Fair Value Through Other Comprehensive Income Held Which Cannot Be Reclassified To The Statement of Operations, Before Tax Payments of short-term debt Repayments of current borrowings Past service cost - Plan amendments Increase (Decrease) in Net Defined Benefit Liability (Asset) Resulting from Past Service Cost, Plan Amendments Increase (Decrease) in Net Defined Benefit Liability (Asset) Resulting from Past Service Cost, Plan Amendments Right-of-use assets Right-of-use assets [member] Euro Medium Term Note Program Euro Medium Term Note Program [Member] Euro Medium Term Note Program Entity address, postal zip code Entity Address, Postal Zip Code Vesting Based on EPS Compared To Peer Group, Stretch Level Vesting Based on EPS Compared To Peer Group, Stretch Level [Member] Vesting Based on EPS Compared To Peer Group, Stretch Level Disclosure of nature and extent of risks arising from financial instruments [line items] Disclosure of nature and extent of risks arising from financial instruments [line items] Cash, repayment of debt Cash, Repayment of Debt [Member] Cash, Repayment of Debt Accumulated income tax losses Accumulated Income Tax Losses Accumulated Income Tax Losses ArcelorMittal equity incentive plan ArcelorMittal Equity Incentive Plan [Member] ArcelorMittal Equity Incentive Plan [Member] Grant date December 5, 2024, Maturity due January 2028 Grant date December 5, 2024, Maturity due January 2028 [Member] Grant date December 5, 2024, Maturity due January 2028 Additions Additions other than through business combinations, property, plant and equipment including right-of-use assets TSR vs. peer group, stretch Vesting Based on TSR Compared To Peer Group, Stretch Level [Member] Vesting Based on TSR Compared To Peer Group, Stretch Level Concentrate sinter fines capacity (in tonnes) Concentrate Sinter Fines Capacity Concentrate Sinter Fines Capacity Reduced VAT rate Reduced Vat Rate Claimed Reduced Vat Rate Claimed INCOME TAXES Disclosure of income tax [text block] 5.5 billion Revolving Credit Facility Five Point Five Billion Revolving Credit Facility, Due 2024-2029 [Member] Five Point Five Billion Revolving Credit Facility, Due 2024-2029 Revenue Description of accounting policy for recognition of revenue [text block] Line of credit, maximum borrowing capacity Line Of Credit Facility, Maximum Borrowing Capacity1 Line Of Credit Facility, Maximum Borrowing Capacity1 Actuarial Assumptions for Defined Benefit Obligations Actuarial assumptions for defined benefit plans [Table Text Block] Actuarial assumptions for defined benefit plans [Table Text Block] Phase [Domain] Phase [Domain] Phase [Domain] Disclosure of impairment loss and reversal of impairment loss [table] Disclosure of impairment loss and reversal of impairment loss [table] Receivables from public authorities Non-current Receivables From Public Authorities Non-current Receivables From Public Authorities Income from investments in associates, joint ventures and other investments Income from investments in associates, joint ventures and other investments Income from investments in associates and joint ventures Income (Loss) From Investments In Associates, Joint Ventures And Other Investments Income (Loss) From Investments In Associates, Joint Ventures And Other Investments No later than eleven years No Later Than Eleven Years [Member] No Later Than Eleven Years Other Other Subsidiaries With Material Noncontrolling Interests [Member] Other Subsidiaries With Material Noncontrolling Interests [Member] More than 2 years Later Than Two Years [Member] Later Than Two Years [Member] Exchange option purchases Exchange Option Purchases [Member] Exchange Option Purchases [Member] Calvert Calvert [Member] Calvert [Member] Disclosure of impairment loss and reversal of impairment loss [line items] Disclosure of impairment loss and reversal of impairment loss [line items] ArcelorMittal appointed board members ArcelorMittal Appointed Board Members ArcelorMittal Appointed Board Members Commodity price risk Commodity price risk [member] Arcellor Mittal Tubular Products Roman ("AMTPR") Arcellor Mittal Tubular Products Roman ("AMTPR") [Member] Arcellor Mittal Tubular Products Roman ("AMTPR") Effect of utilization of unrecognized tax losses carried forward Effect Of Utilization Of Unrecognized Tax Losses Carried Forward Effect Of Utilization Of Unrecognized Tax Losses Carried Forward Project [Domain] Project [Domain] Project [Domain] Disclosure of voluntary change in accounting policy [line items] Disclosure of voluntary change in accounting policy [line items] Proceeds from short-term debt Proceeds from current borrowings Associates Disclosure of associates [text block] Recognition of share-based payments (note 8.3) Increase (decrease) through share-based payment transactions, equity Spare parts Current spare parts Net investment hedge Hedges of net investment in foreign operations [member] Proportion of ownership interest in associate (in percent) Proportion of ownership interest in associate Nominal capacity of renewable energy (in GW) Nominal Capacity Of Renewable Energy Nominal Capacity Of Renewable Energy Net foreign exchange gain/(loss) Foreign exchange gain (loss) Impairment of assets Description of accounting policy for impairment of assets [text block] Options sales/purchases Options Sales/Purchases [Member] Options Sales/Purchases [Member] Classes of property, plant and equipment [domain] Classes of property, plant and equipment [domain] Real Estate (in percent) Real Estate, Amount Contributed To Fair Value Of Plan Assets, Weighted-Average Allocation Percentage Real Estate, Amount Contributed To Fair Value Of Plan Assets, Weighted-Average Allocation Percentage Defined benefits cost (see note 8.2) Defined Benefit Costs Excluding Certain Agreements Defined Benefit Costs Excluding Certain Agreements Entity address, country Entity Address, Country Derivative financial non-current assets Derivative Financial Assets, Non-current [Member] Derivative Financial Assets, Non-current [Member] EUR Euro Member Countries, Euro Disclosure of reconciliation of changes in intangible assets and goodwill [line items] Disclosure of reconciliation of changes in intangible assets and goodwill [line items] 1.5 billion Unsecured Bonds One Point Five Billion Unsecured Bonds, Due 2039 [Member] One Point Five Billion Unsecured Bonds, Due 2039 [Member] Non-financial assets Non-Financial Assets [Member] Non-Financial Assets [Member] Impairment charges Adjustments for impairment loss (reversal of impairment loss) recognised in profit or loss Arbitration claim Arbitration Claim Arbitration Claim Document annual report Document Annual Report Disclosure of contingent liabilities in business combination [line items] Disclosure of contingent liabilities in business combination [line items] Return on plan assets (lower)/ higher than discount rate Return on plan assets excluding interest income or expense, net defined benefit liability (asset) Decrease (increase) in net defined benefit liability (asset) resulting from return on plan assets excluding interest income or expense Geographical areas [domain] Geographical areas [domain] Disclosure of Other Long-term Obligations Other Liabilities, Noncurrent [Table Text Block] Other Noncurrent Liabilities [Table Text Block] Other liabilities Other Liability Related Temporary Differences [Member] Other Liability Related Temporary Differences [Member] €66m fixed rate loan €66m Fixed Rate Loan [Member] €66m Fixed Rate Loan Current assets Current assets recognised as of acquisition date 500 Unsecured Notes Five Hundred Million Unsecured Notes, Due 2025 [Member] Five Hundred Million Unsecured Notes, Due 2025 [Member] Disclosure of Assets Based on Categories Disclosure of financial assets [text block] Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity Mining Mining [Member] Mining [Member] Revolving multi-currency letter of credit facility, due 2028 Revolving Multi-Currency Letter Of Credit Facility, Due 2028 [Member] Revolving Multi-Currency Letter Of Credit Facility, Due 2028 Disclosure of credit risk exposure [table] Disclosure of credit risk exposure [table] Iron ore (in USD per tonne) Goodwill, Price Assumptions, Iron Ore Goodwill, Price Assumptions, Iron Ore Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption Additions Inventory write-down Ownership [Domain] Ownership [Domain] Pension plan benefits Pension defined benefit plans Net periodic pension cost Pension defined benefit plans [member] Reconciliation of changes in allowance account for credit losses of financial assets [abstract] Reconciliation of changes in allowance account for credit losses of financial assets [abstract] Proportion of voting rights held in joint venture (in percent) Proportion of voting rights held in joint venture Movement in year (in shares) Increase (decrease) in number of shares outstanding ArcelorMittal Zenica ArcelorMittal Zenica [Member] ArcelorMittal Zenica Gains (losses) on cash flow hedges, net of tax Gains (losses) on cash flow hedges, net of tax Dividends received from associates, joint ventures and other investments Dividends received, classified as operating activities Employee benefits - Recognized actuarial gain (loss) Other comprehensive income, before tax, gains (losses) on remeasurements of defined benefit plans Provision for employees compensations Provision For Employees Compensations [Member] Provision For Employees Compensations Trade accounts receivable and other subject to TSR programs Trade And Other Current Receivables, Subject To TSR Programs [Member] Trade And Other Current Receivables, Subject To TSR Programs [Member] OPERATING DATA Disclosure Of Revenue, Cost Of Sales, Current Assets, And Current Liabilities [Text Block] Disclosure Of Revenue, Cost Of Sales, Current Assets, And Current Liabilities [Text Block] Deferred income tax Description of accounting policy for deferred income tax [text block] LIABILITIES AND EQUITY Equity and liabilities [abstract] Change in unrecoverable surplus in excess of interest Increase (Decrease) Through Excess Of Interest, Unrecoverable Surplus In Plan Increase (Decrease) Through Excess Of Interest, Unrecoverable Surplus In Plan Reconciliation of changes in property, plant and equipment [abstract] Reconciliation of changes in property, plant and equipment [abstract] Entity filer category Entity Filer Category Later than two years and not later than five years Later than two years and not later than five years [member] Disclosure of Other Provisions, Contingent Liabilities and Commitments [Abstract] Disclosure of Other Provisions, Contingent Liabilities and Commitments [Abstract] Disclosure of Other Provisions, Contingent Liabilities and Commitments [Abstract] Interest cost on DBO Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income) Reclassification of foreign exchange reserve Reclassification of foreign exchange and other Reclassification Of Foreign Exchange Reserve Reclassification Of Foreign Exchange Reserve Nominal amount of the hedging instrument Notional Nominal amount of hedging instrument Operating income Operating income (loss)3 Operating income Profit (loss) from operating activities Tubular products Tubular products [Member] Tubular products [Member] Reasonable possible increase in risk variable, debt Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Increase In Risk Variable, Debt Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Increase In Risk Variable, Debt Entity address, address line one Entity Address, Address Line One 500 Unsecured Bonds Five Hundred Million Unsecured Bonds, Due 2039 [Member] Five Hundred Million Unsecured Bonds, Due 2039 [Member] Purchase consideration Purchase Consideration [Member] Purchase Consideration Purchase agreement amount of tonnes Purchase Agreement, Amount Purchase Agreement, Amount Net interest cost Interest expense (income), defined benefit plans Sovereign-fund guaranteed receivables Sovereign-Fund Guaranteed Receivables [Member] Sovereign-Fund Guaranteed Receivables Dividends per share, base amount (in USD per share) Dividends Per Share, Base Amount Per Share Dividends Per Share, Base Amount Per Share Other comprehensive income (loss) Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax India and JVs India And JVs [Member] India And JVs Ownership [Axis] Ownership [Axis] Receivables recognised as of acquisition date Receivables Recognised As Of Acquisition Date Receivables Recognised As Of Acquisition Date Situation In Ukraine And Collateral Consequences [Abstract] Situation In Ukraine And Collateral Consequences [Abstract] Situation In Ukraine And Collateral Consequences Short-term bilateral credit facility Short-Term Bilateral Credit Facilities [Member] Short-Term Bilateral Credit Facilities [Member] Purchase of property, plant and equipment and intangibles Capital expenditures Purchase of property, plant and equipment, intangible assets other than goodwill, investment property and other non-current assets Number of mandatorily convertible bonds repaid Number Of Mandatorily Convertible Bonds Repaid Number Of Mandatorily Convertible Bonds Repaid Estimate of contributions expected to be paid to plan for next annual reporting period Estimate of contributions expected to be paid to plan for next annual reporting period OCI net of deferred tax Other comprehensive income, net of tax, hedges of net investments in foreign operations Cash consideration excluding consideration payable Consideration paid, net of cash acquired (received) Consideration Transferred, Net of Cash Acquired, Excluding Consideration Payable Consideration Transferred, Net of Cash Acquired, Excluding Consideration Payable PROVISIONS, CONTINGENCIES AND COMMITMENTS Disclosure of provisions [text block] Disclosure of financial assets [table] Disclosure of financial assets [table] Fair value per share, Forfeited (USD per share) Other Equity Instruments Forfeited In Share-based Payment Arrangement, Fair Value Price Per Share Other Equity Instruments Forfeited In Share-based Payment Arrangement, Fair Value Price Per Share Disposal group classification [Axis] Disposal Group Classification1 [Axis] Disposal Group Classification [Axis] Vesting [Domain] Vesting1 [Domain] [Domain] for Vesting [Axis] Title and Position [Domain] Title and Position [Domain] Market price of emission rights Market Price Of Emission Rights [Member] Market Price Of Emission Rights Decrease in equity related to financing cost from conversion of convertible instruments Increase (Decrease) Through Financing Cost Related To Conversion Of Convertible Instruments, Equity Increase (Decrease) Through Financing Cost Related To Conversion Of Convertible Instruments, Equity Healthcare cost trend rate Actuarial assumption of medical cost trend rates [member] Czech Republic CZECHIA Termination benefits Termination Benefits [Member] Termination Benefits [Member] Total Total Post-employment benefit expense in profit or loss, defined benefit plans Germany GERMANY Current liabilities: Current liabilities [abstract] Brazil BRAZIL Schedule of Accrued Expenses and Other Liabilities Schedule Of Accrued Liabilities And Other Current Liabilities [Table Text Block] Schedule Of Accrued Liabilities And Other Current Liabilities [Table Text Block] Customer relationships and trade marks Customer-related intangible assets [member] Characteristics of defined benefit plans [domain] Characteristics of defined benefit plans [domain] Expected life of beneficiaries Actuarial assumption of mortality rates [member] Administrative cost Increase (decrease) in net defined benefit liability (asset) resulting from expense (income) in profit or loss Disclosure of fair value measurement of assets [line items] Disclosure of fair value measurement of assets [line items] Disclosure of transactions between related parties [line items] Disclosure of transactions between related parties [line items] Disclosure of detailed information about hedging instruments [line items] Disclosure of detailed information about hedging instruments [line items] Canada Canada CANADA Proportion of ownership interest in joint operation (in percent) Proportion of ownership interest in joint operation Number of tubular products facilities Number of Tubular Products Facilities Sold Number of Tubular Products Facilities Sold Income (Loss) from Investments in Associates, Joint Ventures and Other Investments Disclosure Of Income (Loss) From Investments [Table Text Block] Disclosure Of Income (Loss) From Investments [Table Text Block] Galvanization total capacity (in tonnes) Galvanization Total Capacity Galvanization Total Capacity China CHINA Contact Personnel Email Address Contact Personnel Email Address Accrued interest Non-current interest receivable Fully settled capital increase on behalf of non-controlling interests Fully Settled Capital Increase On Behalf Of Non-Controlling Interests Fully Settled Capital Increase On Behalf Of Non-Controlling Interests Minimum guaranteed rate of return of insured plans (in percent) Defined Contribution Plan, Minimum Guaranteed Rate Of Return Defined Contribution Plan, Minimum Guaranteed Rate Of Return Argentina ARGENTINA Classes of financial liabilities [axis] Classes of financial liabilities [axis] Classes of financial liabilities [domain] Classes of financial liabilities [domain] Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items] [Line Items] for Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Table] Acquisition gain of Calvert Goodwill/(bargain purchase gain) Gain recognised in bargain purchase transaction Additions to right-of-use assets Additions to right-of-use assets Prepaid due to unrecoverable surpluses Unrecoverable surplus at beginning of the period Unrecoverable surplus at end of the period Unrecoverable Surplus In Plan Unrecoverable Surplus In Plan Payments for acquisition Other cash payments to acquire equity or debt instruments of other entities, classified as investing activities Acquisitions of net assets of subsidiaries, net of cash acquired of 369, 249 and 4 in 2025, 2024 and 2023, respectively Cash flows used in obtaining control of subsidiaries or other businesses Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities Commitments in relation to joint ventures Commitments in relation to joint ventures EIB loan EIB Loan, Due 2032 [Member] EIB Loan, Due 2032 Bosnia and Herzegovina BOSNIA AND HERZEGOVINA $500 Unsecured Notes Five Hundred Million Unsecured Notes, Due 2034 [Member] Five Hundred Million Unsecured Notes, Due 2034 Conversion of mandatorily convertible notes (in shares) Issue Of Convertible Instruments, Shares Issue Of Convertible Instruments, Shares Plan assets Plan assets [member] Belgium BELGIUM Interest income Adjustments for interest income Lease liabilities Lease liabilities Investments in equity instruments designated at fair value through other comprehensive income [domain] Investments in equity instruments designated at fair value through other comprehensive income [domain] Disclosure of Changes in Provisions Disclosure of Changes in Provisions [Table Text Block] Disclosure of Changes in Provisions [Table Text Block] Base Metals Base Metals [Member] Base Metals [Member] Liabilities arising from financing activities [domain] Liabilities arising from financing activities [domain] Schedule of Share Unit Plan Activity Disclosure of number and weighted average exercise prices of other equity instruments [text block] Trade accounts receivable and other Description of accounting policy for trade and other receivables [text block] Fully funded pension plans Fully Funded Pension Plans [Member] Fully Funded Pension Plans Common shares (no par value, 1,033,608,827 and 1,111,418,599 shares authorized, 775,000,000 and 852,809,772 shares issued, and 761,125,819 and 768,546,622 shares outstanding at December 31, 2025 and 2024, respectively) Issued capital ArcelorMittal RZK Çelik Servis Merkezi ArcelorMittal RZK Celik Servis Merkezi Sanayi ve Ticaret Anonim Sirketi [Member] ArcelorMittal RZK Celik Servis Merkezi Sanayi ve Ticaret Anonim Sirketi [Member] Disclosure of reconciliation of liabilities arising from financing activities [line items] Disclosure of reconciliation of liabilities arising from financing activities [line items] Unused tax losses for which no deferred tax asset recognised Unrecognized Unused tax losses for which no deferred tax asset recognised Other Other intangible assets [member] Thabazimbi Mine Thabazimbi Mine [Member] Thabazimbi Mine [Member] Categories of financial assets [axis] Categories of financial assets [axis] Tax Period [Domain] Tax Period1 [Domain] [Domain] for Tax Period [Axis] Base salary and directors fees Key Management Personnel Compensation, Base Salary And Directors Fees Key Management Personnel Compensation, Base Salary And Directors Fees Shares outstanding (in shares) Beginning balance (in shares) Ending balance (in shares) Number of shares outstanding Gains (losses) on disposal of intangible assets Gains (Losses) On Disposal Of Intangible Assets Gains (Losses) On Disposal Of Intangible Assets ZAR South Africa, Rand Products and services [axis] Products and services [axis] Carrying amount Financial liabilities Discount rate (in percent) Property Plant and Equipment, Discount Rate, Before Tax Property Plant and Equipment, Discount Rate, Before Tax Property plant & equipment Other property, plant and equipment [member] Income tax expense Income tax benefit (expense) Income tax expense Total income tax expense Tax expense (income) Disclosure of maturity analysis of operating lease payments [line items] Disclosure of maturity analysis of operating lease payments [line items] Document transition report Document Transition Report Shares buyback (in shares) Shares buyback (in shares) Stock Repurchased During Period Shares1 Stock Repurchased During Period Shares1 Contingent liabilities recognised in business combination Contingent liabilities recognised in business combination Schedule of Other Tax Items Schedule of Other Tax Items [Table Text Block] Schedule of Other Tax Items [Table Text Block] Disclosure of defined benefit plans [line items] Disclosure of defined benefit plans [line items] MAD Madagascar, Ariary Maturity [axis] Maturity [axis] Income tax (expense) benefit related to components of other comprehensive income that can be recycled to the consolidated statements of operations Income tax relating to components of other comprehensive income that will be reclassified to profit or loss United Kingdom UNITED KINGDOM Goodwill allocation Goodwill PIS/COFINS Credits PIS COFINS Credits [Member] PIS/COFINS Credits Associates [axis] Associates [axis] Accretion of defined benefit obligations and other long term liabilities Accretion of Defined Benefit Obligations and Other Long Term Liabilities Accretion of Defined Benefit Obligations and Other Long Term Liabilities Current and deferred tax relating to items credited (charged) directly to equity Current and deferred tax relating to items credited (charged) directly to equity Document type Document Type Average production per year Contracted Average Slab Supply Per Year Contracted Average Slab Supply Per Year Spain SPAIN Unrealized Gains (Losses) on Investments in Equity Instruments at FVOCI Reserve of gains and losses on financial assets measured at fair value through other comprehensive income [member] Reasonably possible increase in risk variable, impact on income Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Increase In Risk Variable, Impact On Income Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Increase In Risk Variable, Impact On Income Foreign exchange differences Increase (decrease) through net exchange differences, intangible assets other than goodwill Profit or loss [abstract] Profit or loss [abstract] Notional amount unwound Notional Amount Unwound Notional Amount Unwound ArcelorMittal Flat Europe S.A. ArcelorMittal Flat Carbon Europe S.A. [Member] ArcelorMittal Flat Carbon Europe S.A. [Member] Short-term provisions Current provisions Disclosure of joint operations [line items] Disclosure of joint operations [line items] Types of share-based payment arrangements [domain] Types of share-based payment arrangements [domain] France FRANCE Equity attributable to the equity holders of the parent Net assets attributable to equity holders of the parent Equity attributable to the equity holders of the parent Equity attributable to owners of parent Subsidiaries with material non-controlling interests Subsidiaries with material non-controlling interests [member] Number of iron ore beneficiation plants Number Of Iron Ore Beneficiation Plants Number Of Iron Ore Beneficiation Plants Components of equity [axis] Components of equity [axis] Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] Entity information [Line Items] Entity Information [Line Items] Share Repurchase Program [Domain] Share Repurchase Program [Domain] Disclosure of financial liabilities [line items] Disclosure of financial liabilities [line items] ArcelorMittal Temirtau ArcelorMittal Temirtau [Member] ArcelorMittal Temirtau Accumulated income tax losses subject to recapture Accumulated Income Tax Losses Subject To Recapture Accumulated Income Tax Losses Subject To Recapture Arcelor Arcelor [Member] Arcelor 10% decrease, trade receivables Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Change In Risk Variable, Ten Percent Decrease, Impact On Trade Receivables Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Change In Risk Variable, Ten Percent Decrease, Impact On Trade Receivables Experience adjustment Decrease (increase) in net defined benefit liability (asset) resulting from actuarial gains (losses) arising from experience adjustments Treasury shares held Treasury Shares Held Treasury Shares Held Categories of related parties [domain] Categories of related parties [domain] Other current assets Other current assets Kazakstan KAZAKHSTAN Long-term provisions Other non-current provisions Gains (losses) on net monetary position Gains (losses) on net monetary position Foreign exchange and others Increase (Decrease) Through Foreign Exchange And Other, Contract Assets Increase (Decrease) Through Foreign Exchange And Other, Contract Assets Capacity of steelmaking Capacity Of Steelmaking Capacity Of Steelmaking Foreign exchange differences Increase (decrease) through net exchange differences, property, plant and equipment including right-of-use assets Auditor location Auditor Location Steel shipment recorded Steel Shipment Recorded Steel Shipment Recorded Trade accounts payable maturities Trade Payables, Maturity Period Trade Payables, Maturity Period Provisions for social plans (non-current) Social Plan Provision [Member] Social Plan Provision [Member] Sitrel Sitrel [Member] Sitrel [Member] Luxembourg LUXEMBOURG Liberia LIBERIA Basic (in shares) Weighted average number of ordinary shares used in calculating basic earnings per share Chief Financial Officer Chief Financial Officer [Member] Greenko Group Greenko Group [Member] Greenko Group Disclosure of voluntary change in accounting policy [table] Disclosure of voluntary change in accounting policy [table] ArcelorMittal Liberia Ltd AML ArcelorMittal Liberia Holdings Ltd [Member] ArcelorMittal Liberia Holdings Ltd [Member] Peña Colorada Peña Colorada [Member] Peña Colorada [Member] Consideration payable, acquisition-date fair value Consideration Payable, Acquisition-Date Fair Value Consideration Payable, Acquisition-Date Fair Value Gains (losses) arising from sale and leaseback transactions Gains (losses) arising from sale and leaseback transactions Atlas Atlas Renewable Energy [Member] Atlas Renewable Energy Fair value of long-term incentives Key management personnel compensation, share-based payment Entity well-known seasoned issuer Entity Well-known Seasoned Issuer Depreciation and impairment charges: Depreciation and amortisation expense [abstract] 10% increase, trade receivables Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Change In Risk Variable, Ten Percent Increase, Impact On Trade Receivables Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Change In Risk Variable, Ten Percent Increase, Impact On Trade Receivables South Korea KOREA, REPUBLIC OF Disclosure of information for cash-generating units [line items] Disclosure of information for cash-generating units [line items] Accumulated income tax losses, realizable Accumulated Income Tax Losses, Realizable Accumulated Income Tax Losses, Realizable Past service cost, net defined benefit liability (asset) Increase (decrease) in net defined benefit liability (asset) resulting from past service cost Short-term debt and current portion of long term debt Short-term borrowings [member] Gains(losses) on hedges of net investments in foreign operations, net of tax Gains (losses) on hedges of net investments in foreign operations, net of tax Trade accounts payables, accrued expenses and other liabilities Trade accounts payables, accrued expenses and other liabilities Trade Accounts Payables, Accrued Expenses And Other Liabilities INR India, Rupees Type Of Obligation [Domain] Type Of Obligation [Domain] Type Of Obligation [Domain] 31 days or older Later than one month [Member] Later than one month Disclosure of Nature and Extent of Risks Arising from Financial Instruments Disclosure of nature and extent of risks arising from financial instruments [text block] Investments in equity instruments at FVOCI Description of accounting policy for financial assets [text block] Entity current reporting status Entity Current Reporting Status 2-3 years Later than one year and not later than three years [member] Ten percent decrease in Hera Ermac share prices Ten Percent Decrease In Hera Ermac Share Prices [Member] Ten Percent Decrease In Hera Ermac Share Prices Employee Benefits [Abstract] Employee Benefits [Abstract] Employee Benefits [Abstract] Call option, number of business days prior to maturity Borrowings, Convertible, Call Option, Number Of Business Days Prior to Maturity Borrowings, Convertible, Call Option, Number Of Business Days Prior to Maturity Recognition of share-based payments (note 8.3) (in shares) Increase (Decrease) Through Share-based Payment Transactions, Equity, Number Of Shares Increase (Decrease) Through Share-based Payment Transactions, Equity, Number Of Shares Number of board members Number of Board Members Number of Board Members Amount of potential borrowings Borrowings, Maximum Capacity Borrowings, Maximum Capacity Schedule of Sales by Product Type Disclosure of products and services [text block] Association Actionnaires d'Arcelor Association Actionnaires d'Arcelor [Member] Association Actionnaires d'Arcelor [Member] Cost of sales Total Cost of sales Reconciliation From Operating Income [Abstract] Reconciliation From Operating Income (Loss) To Net Income [Abstract] Reconciliation From Operating Income (Loss) To Net Income [Abstract] Current fiscal year end date Current Fiscal Year End Date Overdue period Accounts Receivable, Period Past Due Accounts Receivable, Period Past Due Ireland IRELAND Level of price index (in percent) Level of price index Balance sheet location [Axis] Balance Sheet Location1 [Axis] Balance Sheet Location1 [Axis] Right to acquire equity portion obtained Right To Acquire Equity Portion Right To Acquire Equity Portion Number of claims pending Loss Contingency, Pending Claims, Number1 Loss Contingency, Pending Claims, Number1 Proportion of ownership interest in joint venture (in percent) Proportion of ownership interest in joint venture India INDIA Tax credit, amount Total Tax Credit Carryforward, Amount1 Tax Credit Carryforward, Amount1 Commitments in relation to associates Commitments In Relation To Associates Commitments in relation to associates Liabilities at amortized cost Financial liabilities at amortised cost, category [member] Mines iron ore capacity (in tonnes) Mines Iron Ore Capacity Mines Iron Ore Capacity Disclosure of detailed information about borrowings [line items] Disclosure of detailed information about borrowings [line items] AMTBA ArcelorMittal Tailored Blanks Americas (AMTBA) [Member] ArcelorMittal Tailored Blanks Americas (AMTBA) Italy ITALY Proportion of ownership in joint venture, based on outstanding shares (in percent) Proportion Of Ownership Interest In Joint Venture, Based On Outstanding Shares Proportion Of Ownership Interest In Joint Venture, Based On Outstanding Shares Trade accounts receivable Trade accounts receivables Allowance - opening balance Allowance - closing balance Financial assets Project [Axis] Project [Axis] Project Gains (losses) arising from settlements, defined benefit plans Actuarial gain recognized during the year Gains (losses) arising from settlements, defined benefit plans Harvest cycle period Biological Assets, Harvest Cycle, Period Biological Assets, Harvest Cycle, Period Poland POLAND Commitments within sureties, guarantees, LOC, pledges, and other collateral, related to lease obligations Commitments Within Sureties, Guarantees, LOC, Pledges, And Other Collateral, Related To Lease Obligations Commitments Within Sureties, Guarantees, LOC, Pledges, And Other Collateral, Related To Lease Obligations Total raw materials (base metals), freight, energy, emission rights Raw Materials, Freight, Energy, Emission Rights [Member] Raw Materials, Freight, Energy, Emission Rights [Member] Vesting Based On Performance Of ROCE, Ceiling Level Vesting Based On Performance Of ROCE, Ceiling Level [Member] Vesting Based On Performance Of ROCE, Ceiling Level Total interest rate instruments Total Interest Rate Instruments [Member] Total Interest Rate Instruments Financial amounts receivable Financial Amounts Receivable, Current Financial Amounts Receivable, Current Shares issued (in shares) Issued shares, beginning of period (in shares) Issued shares, end of period (in shares) Number of shares issued Other comprehensive income, before tax, change in value of derivative financial instruments Other Comprehensive Income, Before Tax, Change In Value Of Derivative Financial Instruments Other Comprehensive Income, Before Tax, Change In Value Of Derivative Financial Instruments Incremental shares from assumed conversion of restricted share units and performance share units (in millions) (in shares) Dilutive Effect Of Share-Based Compensation On Number Of Ordinary Shares Dilutive Effect Of Share-Based Compensation On Number Of Ordinary Shares Temporary difference, unused tax losses and unused tax credits [domain] Temporary difference, unused tax losses and unused tax credits [domain] Capital commitments Capital expenditure commitments Capital commitments Retained Earnings Retained earnings [member] Indemnification provision Indemnification Provision [Member] Indemnification Provision Early redemption of mandatory convertible bonds (note 11.2) Consideration allocated to equity component Increase (decrease) through conversion of convertible instruments, equity 2027 Later than one year and not later than two years Later than one year and not later than two years [member] Reasonably possible increase in risk variable percent (in percent) Reasonably possible increase in risk variable percent (in basis points) Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Increase In Risk Variable, Percent Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Increase In Risk Variable, Percent Unrecognized deferred tax assets Deductible temporary differences for which no deferred tax asset is recognised Depreciation and amortization Depreciation and amortization Depreciation and amortization Depreciation and amortisation expense Voluntary separation plans Voluntary Separation Plans [Member] Voluntary Separation Plans [Member] Number of weighted environmental, social and governance indicators Number Of Weighted Environmental. Social And Governance Indicators Number Of Weighted Environmental. Social And Governance Indicators Treasury stock acquired, average price per share (in EUR/USD per share) Treasury Stock Acquired, Average Cost Per Share1 Treasury Stock Acquired, Average Cost Per Share1 Performance obligations satisfied Revenue from performance obligations satisfied or partially satisfied in previous periods Categories of financial assets [domain] Categories of financial assets [domain] Dividends Disclosure of dividends [text block] Derivative financial instruments (notes 6.1 and 6.3) Total current derivative assets (note 4.5) Current derivative financial assets Derivative asset, notional amount Derivative Financial Assets, Notional Amount1 Derivative Financial Assets, Notional Amount1 Changes in equity [abstract] Changes in equity [abstract] Vanderbijlpark Works Site Vanderbijlpark Works Site [Member] Vanderbijlpark Works Site [Member] Mandatorily Convertible Notes Reserve of equity component of convertible instruments [member] Netherlands NETHERLANDS Balance at beginning of the period Balance at end of the period Net amount recognized Defined benefit obligation Net defined benefit liability (asset) Proceeds from long-term debt Proceeds from non-current borrowings Other legal claims Other Legal Claims [Member] Other Legal Claims [Member] TSR vs. peer group, threshold Vesting Based on TSR Compared To Peer Group, Threshold Level [Member] Vesting Based on TSR Compared To Peer Group, Threshold Level [Member] Recognized in other comprehensive income on: Recognized In Other Comprehensive Income [Abstract] Recognized In Other Comprehensive Income Cancellation of shares (note 11.1) Cancellation of treasury shares Net present value of the wholly or partly funded obligation Surplus (deficit) in plan Deferred employee benefits Non-current provisions for employee benefits Right-of-use assets Right-of-use assets Morocco Morocco MOROCCO Contact personnel name Contact Personnel Name Share buyback (note 11.1) Purchase of treasury shares Purchase of treasury shares Hedging instrument, liabilities Liabilities carrying amount Hedging instrument, liabilities Percentage of voting equity interests acquired Percentage of voting equity interests acquired Disclosure of financial assets and liabilities [Line Items] Disclosure Of Financial Assets And Liabilities [Line Items] Disclosure Of Financial Assets And Liabilities [Line Items] Transactions with non-controlling interests Description of accounting policy for transactions with non-controlling interests [text block] Tax assessments related to amortization of goodwill Tax Assessments Related To Amortization Of Goodwill [Member] Tax Assessments Related To Amortization Of Goodwill [Member] Income taxes payable Other Non-Current Liabilities, Income Taxes Payable Other Non-Current Liabilities, Income Taxes Payable Alkat Alkat [Member] Alkat Mexico MEXICO Income Taxes [Abstract] Income Taxes [Abstract] Income Taxes [Abstract] Hedging gains or losses of the reporting period that were recognized in OCI Gain (loss) on hedge ineffectiveness recognised in other comprehensive income Federal public prosecutor of the state of Minas Gerais Case Filed By Federal Public Prosecutor Of The State Of Minas Gerais [Member] Case Filed By Federal Public Prosecutor Of The State Of Minas Gerais [Member] No later than four years No Later Than Four Years [Member] No Later Than Four Years Fair value of previously held interest Acquisition-date fair value of equity interest in acquiree held by acquirer immediately before acquisition date Loss contingency, tax penalty sought, percentage of assessment Loss Contingency, Tax Penalty Sought, Percentage Of Assessment Loss Contingency, Tax Penalty Sought, Percentage Of Assessment Site restoration Provision for decommissioning, restoration and rehabilitation costs Provision for decommissioning, restoration and rehabilitation costs [member] Schedule of Trade Accounts Receivable and Allowance for Expected Credit Losses Schedule Of Accounts, Notes, Loans And Financing Receivable [Table Text Block] Schedule Of Accounts, Notes, Loans And Financing Receivable Tax losses and other tax benefits carried forward Unused tax losses [member] Unused tax losses [member] Expenses of short-term leases Expense relating to short-term leases for which recognition exemption has been used Foreign Currency Translation Adjustments Foreign currency translation adjustments Reserve of exchange differences on translation [member] Shares authorized (in shares) Number of shares authorised Global Chartering Global Chartering Limited [Member] Global Chartering Limited [Member] Current portion of long-term debt Less current portion of long-term debt Current portion of non-current borrowings Power purchase agreements Power Purchase Agreements [Policy Text Block] Power Purchase Agreements Total equity Beginning balance Ending balance Total equity Equity Equity Gross margin Gross profit Others Other Asia and Africa [Member] Other Asia and Africa [Member] Other assets Other Assets Related Temporary Differences [Member] Other Assets Related Temporary Differences [Member] Other comprehensive income, before tax, exchange differences on translation of foreign operations Other comprehensive income, before tax, exchange differences on translation of foreign operations Types of contracts [domain] Types of contracts [domain] Vesting period two Vesting Based On Vesting Period, Period Two [Member] Vesting Based On Vesting Period, Period Two [Member] Movement in Inventory Reserve Changes in Inventory Reserve [Table Text Block] Changes in Inventory Reserve [Table Text Block] Level 2 Level 2 of fair value hierarchy [member] Revenue of sales to related parties Sales Revenue from sale of goods, related party transactions Operating Subsidiaries Operating Subsidiaries [Member] Operating Subsidiaries [Member] Net income attributable to equity holders of the parent Profit (loss), attributable to owners of parent Commercial paper Commercial Paper1 [Member] Commercial Paper1 [Member] Aggregated individually immaterial joint ventures Aggregated individually immaterial joint ventures [member] Remediating toxic sediment Remediating Toxic Sediment [Member] Remediating Toxic Sediment [Member] Basis Of Consolidation [Abstract] Basis Of Consolidation [Abstract] Basis Of Consolidation [Abstract] Prepaid expenses and other current assets Prepaid expenses and other current assets Current prepayments and other current assets Concessions, patents and licenses Concessions, Patents And Licenses [Member] Concessions, Patents and Licenses [Member] Reconciliation of Operating Income (Loss) to Net Income Reconciliation Of Operating Income (Loss) To Net Income [Table Text Block] Reconciliation Of Operating Income (Loss) To Net Income [Table Text Block] Disclosure of changes in accounting estimates [line items] Disclosure of changes in accounting estimates [line items] Disposal of Erdemir shares Increase (Decrease) Through Transfer Between Fair Value Reserve And Retained Earnings, Equity Increase (Decrease) Through Transfer Between Fair Value Reserve And Retained Earnings, Equity Expense non-deductible, loss on disposal Expense Non-deductible For Tax Purposes, Loss On Disposal Expense Non-deductible For Tax Purposes, Loss On Disposal Multiple applied to ArcelorMittal Brazil Longs Business EBITDA in share price calculation Multiple Of EBITDA In Exercise Price Calculation Multiple Of EBITDA In Exercise Price Calculation Tameh Tameh [Member] Tameh [Member] Cash flow hedges Cash flow hedges [member] Prior period taxes Tax Effect Of Prior Period Taxes Tax Effect Of Prior Period Taxes Increase in pre-tax discount rate (change in basis points) Increase (Decrease) In Pre-Tax Discount Rate Increase (Decrease) In Pre-Tax Discount Rate ArcelorMittal Texas HBI LLC ArcelorMittal Texas HBI LLC [Member] ArcelorMittal Texas HBI LLC Deferred tax assets Recognized deferred tax assets Deferred tax assets Inventories Total Current inventories Non-controlling interests Non-controlling interests [member] Non-controlling interests Comprehensive income, attributable to non-controlling interests Document accounting standard Document Accounting Standard Manufacturing and other Other current inventories Vesting Based On ESG, Ceiling Level Vesting Based On ESG, Ceiling Level [Member] Vesting Based On ESG, Ceiling Level Leases not yet commenced Lease Not Yet Commenced, Undiscounted Amount Lease Not Yet Commenced, Undiscounted Amount Right of-use assets: Right-of use assets [Abstract] Right-of use assets Disclosure of quantitative information about right-of-use assets [line items] Disclosure of quantitative information about right-of-use assets [line items] Additional Paid-in Capital Additional paid-in capital [member] Disclosure of joint ventures [table] Disclosure of joint ventures [table] Share-based payments Description of accounting policy for share-based payment transactions [text block] Gap to competition, target Vesting Based on Gap To Competition, Target Level [Member] Vesting Based on Gap To Competition, Target Level [Member] Schedule of Business Combinations Disclosure of detailed information about business combination [text block] Borrowings issuance price percentage (in percent) Borrowings, Issuance Price, Percentage Borrowings, Issuance Price, Percentage AMZ ArcelorMittal Zenica And ArcelorMittal Prijedor [Member] ArcelorMittal Zenica And ArcelorMittal Prijedor Risk exposure associated with instruments sharing characteristic (in percent) Risk Exposure Associated With Instruments Sharing Characteristic, Concentration Percentage Risk Exposure Associated With Instruments Sharing Characteristic, Concentration Percentage Past service cost - Curtailments Past service cost - Curtailments Increase (Decrease) in Net Defined Benefit Liability (Asset) Resulting from Past Service Cost, Plan Curtailments Increase (Decrease) in Net Defined Benefit Liability (Asset) Resulting from Past Service Cost, Plan Curtailments Financial assumptions Decrease (increase) in net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions Disclosure of detailed information about financial instruments [line items] Disclosure of detailed information about financial instruments [line items] Buildings Buildings [member] Number of shares granted (in shares) Number of shares, Granted (in shares) Number of other equity instruments granted in share-based payment arrangement Exercise price, put option Exercise Price, Put Option Exercise Price, Put Option Divestments (note 2.3) Reversal Of Depreciation Through Divestment, Property Plant And Equipment Including Right-of-use Assets Reversal Of Depreciation Through Divestment, Property Plant And Equipment Including Right-of-use Assets Legal entity [Axis] Legal Entity [Axis] Derivative assets, fair value Derivative financial assets Derivative financial assets Schedule of Significant Divestments Disposal Groups, Including Discontinued Operations1 [Table Text Block] Disposal Groups, Including Discontinued Operations1 [Table Text Block] Amortized cost Increase (Decrease) Through Amortized Cost, Liabilities Arising From Financing Activities Increase (Decrease) Through Amortized Cost, Liabilities Arising From Financing Activities Discount rate Actuarial assumption of discount rates [member] JPY Japan, Yen Disclosure of financial liabilities [table] Disclosure of financial liabilities [table] Settlement amount Loss Contingency, Settlement Amount Loss Contingency, Settlement Amount Trade payables Trade Payables [Member] Trade Payables [Member] Demographic assumptions Decrease (increase) in net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions Disclosure of financial assets that are either past due or impaired [table] Disclosure of financial assets that are either past due or impaired [table] Geographical areas [axis] Geographical areas [axis] Basque country in Spain, Luxembourg, Mexico, Poland and Switzerland Basque Country in Spain, Luxembourg, Mexico, Poland and United States [Member] Basque Country in Spain, Luxembourg, and the United States [Member] Other (in percent) Other Instruments, Amount Contributed To Fair Value Of Plan Assets, Asset Target Allocation Percentage Other Instruments, Amount Contributed To Fair Value Of Plan Assets, Asset Target Allocation Percentage Bearer plants Bearer plants Purchase of interests in associates Purchase of interests in associates Tax Year 2028 The 2018 Tax Year [Member] The 2018 Tax Year Perfilor S.A Construcoes Industria e Comercio (Perfilor) Perfilor S.A Construcoes Industria e Comercio (Perfilor) [Member] Perfilor S.A Construcoes Industria e Comercio (Perfilor) of which trade and other payables and provisions Trade And Other Payable And Provisions, Noncurrent Trade And Other Payable And Provisions, Noncurrent Related Party [Abstract] Related Party [Abstract] Related Party [Abstract] Derivative financial non-current liabilities Derivative financial liabilities, non-current [Member] Derivative financial liabilities, non-current [Member] Various other legal claims Various Other Legal Claims [Member] Various Other Legal Claims [Member] Reasonably possible decrease in risk variable, impact on equity Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Decrease In Risk Variable, Impact On Equity Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Decrease In Risk Variable, Impact On Equity Aging of Trade Accounts Receivable Disclosure of provision matrix [text block] Intangible assets other than goodwill beginning balance Intangible assets other than goodwill ending balance Intangible assets other than goodwill Disposals Disposals, intangible assets other than goodwill Useful life Useful Lives Or Amortisation Rates, Intangible Assets Other Than Goodwill, Period1 Useful Lives Or Amortisation Rates, Intangible Assets Other Than Goodwill, Period1 Segments [domain] Segments [domain] Cash and cash equivalents At the beginning of the year At the end of the year of which cash, cash equivalents and restricted cash Total Cash and cash equivalents 2013 to 2015 Tax Year 2013 to 2015 Tax Year [Member] 2013 to 2015 Tax Year Average trade payable maturity, last five years Average Trade Accounts Payable Days, Last Five Years Average Trade Accounts Payable Days, Last Five Years Dividend payable Dividend payables Decrease in shipments (change in %) Decrease In Shipments Decrease In Shipments ArcelorMittal South Africa Ltd. ("AMSA") AMSA ArcelorMittal South Africa Ltd. ("AMSA") [Member] ArcelorMittal South Africa Ltd. [Member] Disclosure of Detailed Information About Borrowings Disclosure of detailed information about borrowings [text block] Disclosure of performance obligations [line items] Disclosure of performance obligations [line items] Business combinations [axis] Business combinations [axis] Land, buildings and Improvements Land and buildings [member] Energy Energy [Member] Energy [Member] Freight Freight [Member] Freight [Member] Long-term debt, net of current portion Long-term borrowings [member] Materials Raw materials and consumables used Performance Share Units (PSUs) Performance Share Units (PSU) [Member] Performance Share Units (PSU) [Member] Health and safety ("H&S") Health And Safety (H&S) [Member] Health And Safety (H&S) Disclosure of Maturity Analysis for Non-derivative Financial Liabilities Disclosure of maturity analysis for non-derivative financial liabilities [text block] €500 million Unsecured Notes Five Hundred Million EUR Unsecured Notes, Due 2031 [Member] Five Hundred Million EUR Unsecured Notes, Due 2031 Cash deposit in connection with the mandatory convertible bonds Cash Deposit, Mandatory Convertible Bonds Cash Deposit, Mandatory Convertible Bonds NEMM New Energy Soft Magnetic Material Project Upstream and New Energy Soft Magnetic Material Project Downstream [Member] New Energy Soft Magnetic Material Project Upstream and New Energy Soft Magnetic Material Project Downstream Disclosure of Detailed Information About Hedging Instruments Disclosure of detailed information about hedging instruments [text block] Rates of return of insured plans on employer contributions (in percent) Defined Contribution Plan, Employers Matching Contribution, Minimum Guaranteed Rate Of Return Defined Contribution Plan, Employers Matching Contribution, Minimum Guaranteed Rate Of Return Interest rate risk Interest rate risk [member] Other non-current assets Other Non-current Assets Recognised As Of Acquisition Date Other Non-current Assets Recognised As Of Acquisition Date Dividend income Dividend income Award vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Cases 14 - 20 Cases 14 - 20 [Member] Cases 14 - 20 Write-off of net operating loss carry forward Loss Contingency, Write off Of Net Operating Loss Carryforward, Amount Loss Contingency, Write off Of Net Operating Loss Carryforward, Amount Other loans and lease, contractual cash flow Other Loans, Undiscounted Cash Flows Other Loans, Undiscounted Cash Flows Investments in equity instruments at FVOCI: Investments In Equity Instruments Measured At Fair Value Through Other Comprehensive Income [Abstract] Investments In Equity Instruments Measured At Fair Value Through Other Comprehensive Income Subsequent years Greater than 5 years Later than five years [member] Dividend recommended Dividend Recommended [Member] Dividend Recommended Gap to competition, threshold Vesting Based on Gap To Competition, Threshold Level [Member] Vesting Based on Gap To Competition, Threshold Level Classes of financial assets [domain] Classes of financial assets [domain] Fixed Income Securities (including cash) (in percent) Fixed Income Securities Including Cash, Amount Contributed To Fair Value Of Plan Assets, Weighted-Average Allocation Percentage Fixed Income Securities Including Cash, Amount Contributed To Fair Value Of Plan Assets, Weighted-Average Allocation Percentage Fair value measurement adjustment not recognized Investments In Associates, Fair Value Measurement Adjustment Not Recognized Investments In Associates, Fair Value Measurement Adjustment Not Recognized Disclosure of reconciliation of changes in intangible assets and goodwill [table] Disclosure of reconciliation of changes in intangible assets and goodwill [table] VAT receivables Current value added tax receivables Defined contribution plan, expected to be paid Defined Contribution Plan, Expected To Be Paid To Plan Defined Contribution Plan, Expected To Be Paid To Plan Other commitments Other Commitments1 Other Commitments1 Interest expense on lease liabilities Interest expense on lease liabilities Acquisitions through business combinations (note 2.2.4) Acquisitions through business combinations, intangible assets other than goodwill Impairment of financial assets [axis] Impairment of financial assets [axis] Phase [Axis] Phase [Axis] Phase Goodwill/(bargain purchase gain) Goodwill recognised as of acquisition date Term contracts purchases Term Contracts Purchases [Member] Term Contracts Purchases [Member] Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Auditor name Auditor Name Tauron Polska Energia S.A Tauron Polska Energia S.A [Member] Tauron Polska Energia S.A After offset amount, offset amount and before offset amount [Axis] After Offset Amount, Offset Amount And Before Offset Amount [Axis] After Offset Amount, Offset Amount And Before Offset Amount [Axis] Segment consolidation items [domain] Segment consolidation items [domain] Carbon border adjustment mechanism ("CBAM") Carbon Border Adjustment Mechanism ("CBAM") Carbon Border Adjustment Mechanism ("CBAM") Expenses recognized in the Consolidated Statement of Operations Disclosure Of Defined Benefit Plan Expense Recognized In Profit Or Loss Explanatory [Table Text Block] Disclosure Of Defined Benefit Plan Expense Recognized In Profit Or Loss Explanatory [Table Text Block] Goodwill on acquisitions Goodwill Goodwill [member] Net cash provided by operating activities Net cash provided by / (used in) operating activities Cash flows from (used in) operating activities Finished products Current finished goods Debt instrument, ceded bank accounts to secure environmental obligations, true sale of receivables programs and the revolving base finance facility Debt instrument, Ceded Bank Accounts To Secure Environmental Obligations, True Sale Of Receivables Programs And Revolving Base Finance Facility Debt instrument, Ceded Bank Accounts To Secure Environmental Obligations, True Sale Of Receivables Programs And Revolving Base Finance Facility Disclosure of terms and conditions of share-based payment arrangement [line items] Disclosure of terms and conditions of share-based payment arrangement [line items] Current assets Current Assets [Member] Current Assets Sovereign-fund guaranteed payment Sovereign-Fund Guaranteed Payment Sovereign-Fund Guaranteed Payment Entity [Domain] Entity [Domain] Number of defendants Loss Contingency, Number of Defendants1 Loss Contingency, Number of Defendants1 Cases 1 - 10 Cases 1 - 10 [Member] Cases 1 - 10 Document fiscal year focus Document Fiscal Year Focus European Bank For Reconstruction And Development (EBRD) 2023 European Bank For Reconstruction And Development (EBRD) 2023 [Member] European Bank For Reconstruction And Development (EBRD) 2023 Adjustments to reconcile net income to net cash provided by operations: Adjustments to reconcile profit (loss) [abstract] 2029 Tax Year 2029 [Member] Tax Year 2029 Acindar Industria Argentina de Aceros S.A. Acindar Industria Argentina de Aceros S.A. [Member] Acindar Industria Argentina de Aceros S.A. [Member] ArcelorMittal Long Products Canada G.P. ArcelorMittal Long Products Canada G.P. [Member] ArcelorMittal Long Products Canada G.P. [Member] Cross currency swap Cross Currency Swap [Member] Cross Currency Swap [Member] Other investments Investments other than investments accounted for using equity method Other investments Other Investments1 [Member] Other Investments1 [Member] Purchase agreement term Purchase Agreement Term Purchase Agreement Term Put option with ISP Written put options [member] Long products Long products [Member] Long products [Member] North America North America [Member] Cross currency swap, maturity March 2020 Cross Currency Swap, 500 Notional Amount, Maturity March 2020 [Member] Cross Currency Swap, 500 Notional Amount, Maturity March 2020 Types of interest rates [domain] Types of interest rates [domain] €500 million Unsecured Notes Five Hundred Million EUR Unsecured Notes, Due 2028 [Member] Five Hundred Million EUR Unsecured Notes, Due 2028 Prepaid expenses and non-trade receivables Current Prepayments And Other Current Receivables The amount of current prepayments and current accrued income. [Refer: Prepayments; Accrued income] Conversion of mandatorily convertible notes (note 11.2) Issue of convertible instruments Number of plaintiffs Loss Contingency, Number of Plaintiffs Loss Contingency, Number of Plaintiffs ArcelorMittal México S.A. de C.V. ArcelorMittal Mexico S.A. de C.V. [Member] ArcelorMittal Mexico S.A. de C.V. [Member] Disclosure of initial application of standards or interpretations [table] Disclosure of initial application of standards or interpretations [table] Other Other finance cost Characteristics of defined benefit plans [axis] Characteristics of defined benefit plans [axis] Borrowings, issuance amount of principal (in percent) Borrowings, Issuance Amount Of Principal, Percent Borrowings, Issuance Amount Of Principal, Percent Current trade receivables Current trade receivables By-product sales By-Product Sales [Member] By-Product Sales [Member] Net assets related to funded obligations Assets of benefit plan PJSC ArcelorMittal Kryvyi Rih ("AMKR") AMKR PJSC ArcelorMittal Kryvyi Rih [Member] PJSC ArcelorMittal Kryvyi Rih [Member] Tax assessment penalty Loss Contingency, Tax Penalty Sought Loss Contingency, Tax Penalty Sought Consideration received through repayment of intra-group dues Consideration Received Through Repayment Of Intra-Group Dues Consideration Received Through Repayment Of Intra-Group Dues Recognized directly in equity on: Current and deferred tax relating to items charged or credited directly to equity [abstract] Fair value price per granted share (USD per share) Fair value per share, Granted (USD per share) Other Equity Instruments Granted In Share-based Payment Arrangement, Fair Value Price Per Share Other Equity Instruments Granted In Share-based Payment Arrangement, Fair Value Price Per Share Net debt Net Debt, Excluding Portion Included In Disposal Groups Classified As Held For Sale Net Debt, Excluding Portion Included In Disposal Groups Classified As Held For Sale Coking coal (in USD per tonne) Goodwill, Price Assumptions, Coking Coal Goodwill, Price Assumptions, Coking Coal Kryvyi Rih Steel Plant Kryvyi Rih Steel Plant [Member] Kryvyi Rih Steel Plant Sustainable Solutions Sustainable Solutions Segment [Member] Sustainable Solutions Segment Increase (decrease) in fair value measurement, assets Increase (decrease) in fair value measurement, assets Total Long Term Borrowings (Excluding Long/Short Term Lease Liabilities) Including Current Portion [Member] Long Term Borrowings Including Current Portion [Member] Identifiable intangible assets recognised as of acquisition date Intangible assets Identifiable intangible assets recognised as of acquisition date Cash transferred Cash transferred Number of pellet plant systems Number Of Pellet Plant Systems Number Of Pellet Plant Systems Investment, Name [Axis] Investment, Name [Axis] Entity voluntary filers Entity Voluntary Filers Share in net earnings of equity-accounted companies Adjustments for undistributed profits of investments accounted for using equity method Additions Impairment charge (note 5.3) Impairment loss recognised in profit or loss Increase in sales volumes Increase In Sales Volumes Increase In Sales Volumes Components of Net Periodic Pension and Post-employment Cost Disclosure of additional information about defined benefit plans [text block] Auxiliary facilities Auxiliary Facilities [Member] Auxiliary Facilities [Member] Proportion of ownership interest in subsidiary (in percent) Proportion of ownership interest in subsidiary Income statement location [Domain] Income Statement Location1 [Domain] [Domain] for Income Statement Location1 [Axis] Foreign currency translation reserve Reserve of exchange differences on translation, continuing hedges Entity registrant name Entity Registrant Name Basic (USD per share) Basic earnings (loss) per share Unrealized foreign exchange effects Adjustments for unrealised foreign exchange losses (gains) Investments in equity instruments at FVOCI Investments In Equity Instruments Designated At Fair Value Through Other Comprehensive Income1 [Member] Investments In Equity Instruments Designated At Fair Value Through Other Comprehensive Income1 [Member] Settlement of outstanding receivable Settlement Of Outstanding Receivable As of Acquisition Date Settlement Of Outstanding Receivable As of Acquisition Date Measurement [axis] Measurement [axis] Brazil Long Steel Brazil [Member] Long Steel Brazil Executive Office Plan Executive Office Plan [Member] CEO Office Plan [Member] Property, plant and equipment, temporarily idle Property, plant and equipment, temporarily idle New York Stock Exchange NEW YORK STOCK EXCHANGE, INC. [Member] Borrowings, number of extensions Borrowings, Number Of Extension Options Borrowings, Number Of Extension Options Disclosure of Cash and Cash Equivalents Disclosure Of Cash And Cash Equivalents Explanatory [Table Text Block] Disclosure Of Cash And Cash Equivalents Explanatory [Table Text Block] Disclosure of associates [table] Disclosure of associates [table] INR 7.5 Billion Loan INR 7.5 Billion Loan [Member] INR 7.5 Billion Loan EIB Loan, Due 2017-2020 EIB Loan, Due 2017-2020 [Member] EIB Loan, Due 2017-2020 Percentage of tax assessment anulled Percentage Of Tax Assessment Anulled Percentage Of Tax Assessment Anulled 4 Billion ZAR revolving borrowing base finance facility, due in 2027 Four Billion South Africa Rand Revolving Borrowing Base Finance Facility, Due In 2027 [Member] Four Billion South Africa Rand Revolving Borrowing Base Finance Facility, Due In 2027 Financing costs - net Financing Costs [Member] Financing Costs [Member] Long-term VAT receivables Non-current value added tax receivables Continuing involvement in derecognised financial assets by type of instrument [domain] Continuing involvement in derecognised financial assets by type of instrument [domain] Non-controlling interests Non-controlling interests Gains (losses) on financial assets measured at fair value through other comprehensive income, before tax Gains (losses) on financial assets measured at fair value through other comprehensive income, before tax Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [table] Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [table] Segment consolidation items [axis] Segment consolidation items [axis] PERSONNEL EXPENSES AND DEFERRED EMPLOYEE BENEFITS Disclosure of employee benefits [text block] Plan Name [Domain] Plan Name1 [Domain] [Domain] for Plan Name [Axis] Schedule of Goodwill and Intangible Assets Disclosure of reconciliation of changes in intangible assets and goodwill [text block] Brazil and neighboring countries ("Brazil") Brazil Brazil Segment [Member] Brazil Segment [Member] Vallourec Vallorec [Member] Vallorec Sonasid Sonasid Sonasid [Member] Sonasid [Member] All Currencies [Domain] All Currencies [Domain] Disclosure of disaggregation of revenue from contracts with customers [table] Disclosure of disaggregation of revenue from contracts with customers [table] Disclosure of operating segments [abstract] Disclosure of operating segments [abstract] Disclosure of Fair Value Measurement of Assets Disclosure of fair value measurement of assets [text block] Past service cost - Curtailments Decrease (Increase) In Net Defined Benefit Liability (Asset) Resulting From Gains (Losses) Arising From Curtailments Decrease (Increase) In Net Defined Benefit Liability (Asset) Resulting From Gains (Losses) Arising From Curtailments Total Income (Loss) Of Associates, Joint Ventures And Other Investments, Net Income (Loss) Of Associates, Joint Ventures And Other Investments, Net Number of service centers Number of Service Centers Number of Service Centers Vesting Based on Gap To Competition, Ceiling Level Vesting Based on Gap To Competition, Ceiling Level [Member] Vesting Based on Gap To Competition, Ceiling Level Loans over 100 Loans Over 100 Loans Over 100 Short-term debt Current Borrowings [Member] Current Borrowings [Member] Foreign currency exchange rate differences and other movements Increase (decrease) in net defined benefit liability (asset) resulting from changes in foreign exchange rates, net defined benefit liability (asset) 5 billion Japanese floating rate term loan Five Billion Japanese Floating Rate Term Loan [Member] Five Billion Japanese Floating Rate Term Loan Hedging instruments [axis] Hedging instruments [axis] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Items that can be recycled to the consolidated statements of operations Components of other comprehensive income that will be reclassified to profit or loss, before tax [abstract] Rates of return of insured plans on employee contributions (in percent) Defined Contribution Plan, Employee Contribution, Minimum Guaranteed Rate Of Return Defined Contribution Plan, Employee Contribution, Minimum Guaranteed Rate Of Return Foreign exchange contracts Foreign Exchange Contract1 [Member] Foreign Exchange Contract1 [Member] Trade and other payables, contractual cash flow Trade and other payables, undiscounted cash flows ICFR Auditor attestation flag ICFR Auditor Attestation Flag Disclosure of Fair Value of Plan Assets Disclosure of fair value of plan assets [text block] State VAT rate State VAT Rate State VAT Rate AMTBA, Tekno, Atlas, Calvert and Tuper AMTBA, Tekno, Atlas, Calvert and Tuper [Member] AMTBA, Tekno, Atlas, Calvert and Tuper Expense non-deductible, impairment charges Expense Non-deductible For Tax Purposes, Impairment Charges Expense Non-deductible For Tax Purposes, Impairment Charges ArcelorMittal Poland S.A. ArcelorMittal Poland S.A. [Member] ArcelorMittal Poland S.A. [Member] Litigation Case [Axis] Litigation Case [Axis] Goodwill expected to be deductible for tax purposes Goodwill expected to be deductible for tax purposes Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [table] Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [table] Energy (oil, gas, electricity) Energy (Oil, Gas, Electricity) [Member] Energy (Oil, Gas, Electricity) [Member] Gain (loss) arising during the period Share of other comprehensive income of associates and joint ventures accounted for using equity method that will be reclassified to profit or loss, before tax CO2 emission rights CO2 Emission Rights Current Asset CO2 Emission Rights Current Asset Disaggregation of Revenue From Contracts With Customers Disclosure of disaggregation of revenue from contracts with customers [text block] Equity holders of the parent Comprehensive income, attributable to owners of parent Machinery, equipment and others Machinery, Equipment And Other [Member] Machinery, Equipment And Other [Member] Total liabilities Total liabilities Beginning of period, liabilities End of period, liabilities Liabilities Cash and cash equivalents and restricted cash 1 Cash And Cash Equivalents And Restricted Cash And Cash Equivalents Cash And Cash Equivalents And Restricted Cash And Cash Equivalents Reclassification of the period-end cash and cash equivalents to held for sale Reclassification of the period-end cash and cash equivalents to held for sale Cash and cash equivalents classified as part of disposal group held for sale Healthcare cost trend rate assumed (in percent) Actuarial assumption of medical cost trend rates Recognition (derecognition) of receivables related to business combination and divestments Recognition (Derecognition) of Receivables Related to Business Combination And Divestments Recognition (Derecognition) of Receivables Related to Business Combination And Divestments Number of beneficiaries Number Of Beneficiaries Number Of Beneficiaries Derivative liabilities, notional amount Derivative Liability, Notional Amount1 Derivative Liability, Notional Amount1 Disclosure of Maturity Analysis for Derivative Financial Liabilities Disclosure of maturity analysis for derivative financial liabilities [text block] Disclosure of contingent liabilities in business combination [table] Disclosure of contingent liabilities in business combination [table] Disclosure of net defined benefit liability (asset) [line items] Disclosure of net defined benefit liability (asset) [line items] Income tax liabilities Current tax liabilities, current Fixed Income Securities (including cash) (in percent) Fixed Income Securities Including Cash, Amount Contributed To Fair Value Of Plan Assets, Asset Target Allocation Percentage Fixed Income Securities Including Cash, Amount Contributed To Fair Value Of Plan Assets, Asset Target Allocation Percentage Intangible assets Description of accounting policy for intangible assets other than goodwill [text block] Discount rate applied to cash flow projections Discount rate applied to cash flow projections Transfers and other movements Increase (decrease) through transfers and other changes, intangible assets other than goodwill Disclosure of fair value of plan assets [line items] Disclosure of fair value of plan assets [line items] Disclosure of information for cash-generating units [table] Disclosure of information for cash-generating units [table] Interest expense on bonds Interest expense on bonds Disclosure of nature and extent of risks arising from financial instruments [table] Disclosure of nature and extent of risks arising from financial instruments [table] Long-term lease obligations Lease liabilities [member] Financial guarantee contracts Financial guarantee contracts [member] Derivative financial instruments: Change in value of forward elements of forward contracts [abstract] Award performance period Share-based Compensation Arrangement by Share-based Payment Award, Award Performance Period Share-based Compensation Arrangement by Share-based Payment Award, Award Performance Period European Bank For Reconstruction And Development (EBRD) 2022 European Bank For Reconstruction And Development (EBRD) 2022 [Member] European Bank For Reconstruction And Development (EBRD) 2022 Schedule of Impairment of Assets Disclosure of impairment of assets [text block] Possible write off of net operating loss carryforward Loss Contingency, Possible Write off Of Net Operating Loss Carryforward, Amount Loss Contingency, Possible Write off Of Net Operating Loss Carryforward, Amount The Fonds d'Urbanisation et d'Aménagement du Plateau de Kirchberg and the State of the Grand-Duchy of Luxembourg The Fonds d'Urbanisation Et d'Aménagement Du Plateau De Kirchberg And The State Of The Grand-Duchy Of Luxembourg [Member] The Fonds d'Urbanisation Et d'Aménagement Du Plateau De Kirchberg And The State Of The Grand-Duchy Of Luxembourg Acciaierie d'Italia Holding Acciaierie d'Italia Holding [Member] Acciaierie d'Italia Holding Non-adjusting events after reporting period [axis] Non-adjusting events after reporting period [axis] Hedging instruments [domain] Hedging instruments [domain] Adoption of new IFRS standards, amendments and interpretations applicable from January 1, 2025 Disclosure of initial application of standards or interpretations [text block] Vesting Based On ESG, Threshold Level Vesting Based On ESG, Threshold Level [Member] Vesting Based On ESG, Threshold Level Prepaid expenses and other current assets/Accrued expenses and other liabilities Prepayments And Other Current Assets And Accrued Expenses And Other Liabilities [Member] Current Prepayments And Other Current Assets And Accrued Expenses And Other Liabilities [Member] Research and development costs Research and development expense Litigation and other (see note 9.3) Legal proceedings provision [member] 2029 Later than three years and not later than four years [member] ARS Argentina, Pesos Real Estate (in percent) Real Estate, Amount Contributed To Fair Value Of Plan Assets, Asset Target Allocation Percentage Real Estate, Amount Contributed To Fair Value Of Plan Assets, Asset Target Allocation Percentage Tax credits carried forward Unused tax credits Unused tax credits [member] Assets and liabilities classified as held for sale [axis] Assets and liabilities classified as held for sale [axis] Income tax (expense) benefit related to components of other comprehensive income (loss) that cannot be recycled to the consolidated statements of operations Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss Non-current assets other than financial instruments, deferred tax assets, post-employment benefit assets, and rights arising under insurance contracts Non-current assets other than financial instruments, deferred tax assets, post-employment benefit assets, and rights arising under insurance contracts Joint ventures [axis] Joint ventures [axis] Increase (decrease) through financing cost related to conversion of convertible instruments, net of tax, equity Increase (Decrease) Through Financing Cost Related To Conversion Of Convertible Instruments, Net Of Tax, Equity Increase (Decrease) Through Financing Cost Related To Conversion Of Convertible Instruments, Net Of Tax, Equity Borrowings by name [domain] Borrowings by name [domain] Trade accounts receivables Trade receivables Trade receivables [member] Translation of financial statements denominated in foreign currency Description of accounting policy for functional currency [text block] Vesting period one Vesting Based On Vesting Period, Period One [Member] Vesting Based On Vesting Period, Period One [Member] Exercise term, put option Exercise Term, Put Option Exercise Term, Put Option VdSA Ventos de Santo Antônio Comercializadora de Energia S.A. ("VdSA") [Member] Ventos de Santo Antônio Comercializadora de Energia S.A. ("VdSA") Deferred tax liabilities Deferred tax liabilities Deferred tax liabilities Geographical [Axis] Geographical [Axis] Property, plant and equipment including right-of-use assets [axis] Property, plant and equipment including right-of-use assets [axis] Income taxes paid Income taxes paid (refund), classified as operating activities TSR vs performance index, threshold Vesting Based on TSR Compared To Performance Index, Threshold Level [Member] Vesting Based on TSR Compared To Performance Index, Threshold Level [Member] Short-term provisions Other current provisions Total Non-Derivative Financial Liabilities Non-Derivative Financial Liabilities Treasury Shares Treasury shares [member] Intangible Assets [Abstract] Intangible Assets [Abstract] Intangible Assets [Abstract] Net assets acquired Identifiable liabilities assumed Identifiable assets acquired (liabilities assumed) Net (decrease) in cash and cash equivalents Increase (decrease) in cash and cash equivalents before effect of exchange rate changes Grant date December 16, 2021, maturity due January 2025 Grant date December 16, 2021, Maturity Due January 2025 [Member] Grant date December 16, 2021, Maturity Due January 2025 Others Other Regions [Member] Other Regions [Member] Disclosure of subsidiaries [line items] Disclosure of subsidiaries [line items] Tax credits Tax Effect Of Tax Credit Tax Effect Of Tax Credit Disclosure of Fair Value Measurement of Liabilities Disclosure of fair value measurement of liabilities [text block] Other permanent items Tax Effect Of Other Permanent Differences Tax Effect Of Other Permanent Differences Fair value per share, Exited (USD per share) Other Equity Instruments Exited In Share-based Payment Arrangement, Fair Value Price Per Share Other Equity Instruments Exited In Share-based Payment Arrangement, Fair Value Price Per Share Total deferred tax assets Total deferred tax assets Deferred Tax Assets, Including Unrecognized Amounts Deferred Tax Assets, Including Unrecognized Amounts Cross currency swap, maturity July 2019 Cross Currency Swap, 500 Notional Amount, Maturity July 2019 [Member] Cross Currency Swap, 500 Notional Amount, Maturity July 2019 Assets and liabilities [axis] Assets and liabilities [axis] €235 million facility agreement Two Hundred Thirty Five Million EUR Facility Agreement [Member] Two Hundred Thirty Five Million EUR Facility Agreement [Member] Continuing involvement in derecognised financial assets by type of instrument [axis] Continuing involvement in derecognised financial assets by type of instrument [axis] Award vesting performance, threshold percentage (in percent) Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Performance Threshold Percentage Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Performance Threshold Percentage Bonds issued, maturity December 2054 Bonds Issued. Maturity December 2054 [Member] Bonds Issued. Maturity December 2054 4.5 Billion ZAR revolving borrowing base finance facility, due in 2020 Four Point Five Billion South Africa Rand Revolving Borrowing Base Finance Facility, Due In 2022 [Member] Four Point Five Billion South Africa Rand Revolving Borrowing Base Finance Facility, Due In 2022 [Member] Non-deductible loss on disposal of Kazakhstan operations Tax Effect Of Gain (Loss) Recognised On Disposal Tax Effect Of Gain (Loss) Recognised On Disposal ArcelorMittal Canada Inc ArcelorMittal Canada Inc [Member] ArcelorMittal Canada Inc Total long-term debt (excluding lease obligations) Long-Term Debt Excluding Lease Obligation [Member] Long-Term Debt Excluding Lease Obligation [Member] Attribution of expenses by nature to their function [domain] Attribution of expenses by nature to their function [domain] Use of judgment and estimates Use of Estimates, Policy [Policy Text Block] Use of Estimates, Policy [Policy Text Block] Before Offset Amount Before Offset Amount [Member] Before Offset Amount [Member] Property, plant and equipment including right-of-use assets [domain] Property, plant and equipment including right-of-use assets [domain] Inventory pledged in asset-based revolving credit facility Debt Instrument, Collateral Amount1 Debt Instrument, Collateral Amount1 Repayments of borrowings, classified as financing activities Repayments of borrowings, classified as financing activities Net financial derivatives Derivative financial assets (liabilities) Derivative Financial Assets (Liabilities) Derivative Financial Assets (Liabilities) Downstream Downstream [Member] Downstream Environmental Remediation Site [Axis] Environmental Remediation Site1 [Axis] Environmental Remediation Site1 [Axis] Other Miscellaneous other provisions [member] Acquisition gain of Calvert Tax Effect Of Bargain Purchase Tax Effect Of Bargain Purchase Emission rights Emission obligations Emission Rights [Member] Emission Rights [Member] Foreign exchange translation losses upon disposal of Kazakhstan operations (note 2.3) Profit (loss) from discontinued operations Derivative financial instruments (notes 6.1 and 6.3) Total non-current derivative assets (note 4.6) Non-current derivative financial assets Estimated growth rate (in percent) Growth rate used to extrapolate cash flow projections No later than nine years No Later Than Nine Years [Member] No Later Than Nine Years Classes of Share Capital Disclosure of classes of share capital [text block] Tax losses for which deferred tax asset recognised Recognized Tax Losses For Which Deferred Tax Asset Recognised Tax Losses For Which Deferred Tax Asset Recognised Disclosure of detailed information about hedging instruments [table] Disclosure of detailed information about hedging instruments [table] Threshold aggregate of individually immaterial joint ventures and associates (in percent) Threshold Aggregate Of Individually Immaterial Joint Ventures And Associates Threshold Aggregate Of Individually Immaterial Joint Ventures And Associates Allowance for lifetime expected credit losses Allowance Accumulated impairment [member] Percentage of success on claim Percentage Of Success On Claim Percentage Of Success On Claim Plan Name [Axis] Plan Name1 [Axis] Plan Name [Axis] Schedule of Property, Plant and Equipment Disclosure of detailed information about property, plant and equipment [text block] Settlement of shareholder loan Settlement of Shareholder Loan [Member] Settlement of Shareholder Loan Loan maturity term Loans Receivable, Related Party, Term Loans Receivable, Related Party, Term Borrowings, interest rate (in percent) Borrowings, interest rate Net cash provided by / (used in) investing activities Net cash provided by / (used in) investing activities Cash flows from (used in) investing activities Capacity of blast furnace Capacity Of Blast Furnace Capacity Of Blast Furnace Number of acquistions Number Of Acquistions Number Of Acquistions Vesting percentage (in percent) Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage EIB Loan, Due 2025-2028 EIB Loan, Due 2025-2028 [Member] EIB Loan, Due 2025 [Member] Disposal group classification [Domain] Disposal Group Classification1 [Domain] [Domain] for Disposal Group Classification [Axis] Summary of Share Unit Plans Outstanding Disclosure of other equity instruments [Table Text Block] Disclosure of other equity instruments [Table Text Block] Labor costs Employee benefits expense Fully amortized intangible assets Increase (decrease) in intangible assets other than goodwill Disclosure of Estimated Fair Value and Carrying Value of Debt Disclosure Of Estimated Fair Value And Carrying Value Of Debt [Table Text Block] Disclosure Of Estimated Fair Value And Carrying Value Of Debt [Table Text Block] Amortization charge Amortisation, intangible assets other than goodwill Period of nuclear power contract (in years) Period of Nuclear Power Contract Period of Nuclear Power Contract Accordion feature exercised - increase in borrowing capacity Borrowing Facilities, Accordion Feature, Increase in Borrowing Capacity Option Borrowing Facilities, Accordion Feature, Increase in Borrowing Capacity Total current assets Current assets Current assets Cash deposit in connection with various environmental obligations and true sales of receivable programs Cash Deposit, Various Environmental Obligations and True Sales of Receivable Programs Cash Deposit, Various Environmental Obligations and True Sales of Receivable Programs Number of production plants planned Number of Production Plants Planned Number of Production Plants Planned Derivative financial assets held for hedging Derivative financial assets held for hedging Contractual capital commitments Contractual capital commitments Disclosure of operating segments [table] Disclosure of operating segments [table] ArcelorMittal Méditerranée S.A.S. ArcelorMittal Mediterranée S.A.S. [Member] ArcelorMittal Mediterranée S.A.S. [Member] Number of production plants in Europe Number Of Production Plants In Europe Number Of Production Plants In Europe Cross currency swap, maturity November 2019 Cross Currency Swap, 200 Notional Amount, Maturity November 2019 [Member] Cross Currency Swap, 200 Notional Amount, Maturity November 2019 Segments [axis] Segments [axis] Grant date December 13, 2022, maturity due January 2026 Grant date December 13, 2022, Maturity due January 2026 [Member] Grant date December 13, 2022, Maturity due January 2026 Types of risks [axis] Types of risks [axis] Foreign exchange and others Inventory Valuation Reserves, Foreign Currency Translation Gain (Loss) and Other Inventory Valuation Reserves, Foreign Currency Translation Gain (Loss) and Other Diversity and inclusion ("D&I") Diversity And Inclusion ("D&I") old [Member] Diversity And Inclusion ("D&I") old Tuper Tuper S.A. (Tuper) [Member] Tuper S.A. (Tuper) Divestments and assets held for sale Description of accounting policy for non-current assets or disposal groups classified as held for sale and discontinued operations [text block] ArcelorMittal ArcelorMittal [Member] ArcelorMittal Income tax receivable Current tax assets, current Derivative financial liabilities held for hedging Derivative financial liabilities held for hedging Assets at amortized cost Financial assets at amortised cost, category [member] WDI WDI [Member] WDI [Member] 750 Unsecured Notes Seven Hundred Fifty Million Unsecured Notes, Due 2026 [Member] Seven Hundred Fifty Million Unsecured Notes, Due 2026 [Member] Par value per share (in eur per share) Par value per share Joint Ventures Disclosure of joint ventures [text block] Maturity Analysis of Lease Liabilities Disclosure of maturity analysis of operating lease payments [text block] Payments from mandatorily convertible subordinated notes/ mandatorily convertible bonds Proceeds From (Payments For) Mandatorily Convertible Subordinated Notes Proceeds From (Payments For) Mandatorily Convertible Subordinated Notes Award vesting rights, performance ceiling percentage Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Performance Ceiling Percentage Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Performance Ceiling Percentage Vesting Based on TSR Compared To Performance Index, Ceiling Level Vesting Based on TSR Compared To Performance Index, Ceiling Level [Member] Vesting Based on TSR Compared To Performance Index, Ceiling Level Amendment flag Amendment Flag Other loans Other Loans - Subsidiaries [Member] Other Loans - Subsidiaries Deferred employee benefits Description of accounting policy for employee benefits [text block] Grant date December 5, 2025, Maturity due January 2029 Grant date December 5, 2025, Maturity due January 2029 [Member] Grant date December 5, 2025, Maturity due January 2029 Additions to lease liabilities (notes 5.2 and 7) Increase through new leases, liabilities arising from financing activities Temporary difference, unused tax losses and unused tax credits [axis] Temporary difference, unused tax losses and unused tax credits [axis] Schuldschein loans Schuldschein Loans [Member] Schuldschein Loans Equity Securities (in percent) Equity Instruments, Amount Contributed To Fair Value Of Plan Assets, Weighted-Average Allocation Percentage Equity Instruments, Amount Contributed To Fair Value Of Plan Assets, Weighted-Average Allocation Percentage Performance of ROCE Vesting Based On Performance Of ROCE [Member] Vesting Based On Performance Of ROCE Tranche [Domain] Tranche [Domain] Tranche [Domain] Recurring fair value measurement Recurring fair value measurement [member] Significant shareholder Significant Shareholder [Member] Significant Shareholder [Member] €80m Loan €80m Loan [Member] €80m Loan Hedged item, assets Hedged item, assets Settlement of dividend payable Settlement of Dividend Payable [Member] Settlement of Dividend Payable More than 180 days Later than six months [member] North America NAFTA [Member] NAFTA [Member] Disposals of property, plant and equipment and intangibles Proceeds from disposals of property, plant and equipment, intangible assets other than goodwill, investment property and other non-current assets No later than six years No Later Than Six Years [Member] No Later Than Six Years Renewable energy capacity, equity basis (in GW) Renewable Energy Capacity, Equity Basis Renewable Energy Capacity, Equity Basis Proportion of ownership in joint venture, based on shares issued (in percent) Proportion Of Ownership Interest In Joint Venture, Based On Shares Issued Proportion Of Ownership Interest In Joint Venture, Based On Shares Issued Other loans Other Loans, Due 2028-2035 [Member] Other Loans, Due 2028-2035 Additions Additional provisions, other provisions Number of cash-generating units Number Of Cash-Generating Units Number of Cash-Generating Units Income tax receivable Current tax assets, non-current Minimum percentage post-dividend annual free cash flow Minimum Percentage Post-Dividend Annual Free Cash Flow Minimum Percentage Post-Dividend Annual Free Cash Flow Weighted average common shares outstanding (in millions) for the purposes of basic earnings per share (in shares) Weighted Average Number Of Ordinary Shares Outstanding, Unadjusted Weighted Average Number Of Ordinary Shares Outstanding, Unadjusted ArcelorMittal CLN Distribuzione Italia ArcelorMittal CLN Distribuzione Italia S.r.l. [Member] ArcelorMittal CLN Distribuzione Italia S.r.l. [Member] Currency [Axis] Currency [Axis] Nouvelles Sidérurgies Industrielles Nouvelles Sidérurgies Industrielles [Member] Nouvelles Sidérurgies Industrielles [Member] Schedule of Subsidiaries Disclosure of interests in subsidiaries [text block] Disclosure of terms and conditions of share-based payment arrangement [table] Disclosure of terms and conditions of share-based payment arrangement [table] Total (in percent) Plan Assets At Fair Value, Asset Target Allocation Percentage Plan Assets At Fair Value, Asset Target Allocation Percentage 4.5 Billion ZAR revolving borrowing base finance facility, due in 2026 Four Point Five Billion South Africa Rand Revolving Borrowing Base Finance Facility, Due In 2026 [Member] Four Point Five Billion South Africa Rand Revolving Borrowing Base Finance Facility, Due In 2026 Earnings Per Share Earnings per share [text block] Recognized actuarial (losses) gains Recognized actuarial gain (loss) Reserve of remeasurements of defined benefit plans [member] Brazil, France, Germany, Luxembourg and Spain Brazil, France, Luxembourg, Germany And Spain [Member] Derivative financial liabilities Categories of financial liabilities [abstract] Disclosure of detailed information about property, plant and equipment [table] Disclosure of detailed information about property, plant and equipment [table] Number of motions filed Number of Motions Filed Number of Motions Filed 10% increase, trade payables Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Change In Risk Variable, Ten Percent Increase, Impact On Trade Payables Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Change In Risk Variable, Ten Percent Increase, Impact On Trade Payables Weighted average common shares outstanding (in millions) Weighted average ordinary shares used in calculating basic and diluted earnings per share [abstract]