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Consumer Relationships [Member] Retail - Consumer Relationships At 1 January At 31 December Reserve of gains and losses on financial assets measured at fair value through other comprehensive income Assets that entity continues to recognise to extent of continuing involvement Assets that entity continues to recognise to extent of continuing involvement Classes of other provisions [domain] Classes of other provisions [domain] Net change in ECL due to transfers Net Change In Allowance For Credit Losses Due To Transfers [Member] Net Change In Allowance For Credit Losses Due To Transfers Schedule of Loans and Advances to Customers Disclosure Of Net Carrying Values Of Loans And Advances To Customers [Table Text Block] CONSOLIDATED STATEMENT OF CHANGES IN EQUITY [Abstract] CONSOLIDATED STATEMENT OF CHANGES IN EQUITY [Abstract] Life expectancy [Axis] Life Expectancy [Axis] Derivative Instrument Risk1 [Domain] Derivative Instrument Risk1 [Domain] Derivative Instrument Risk1 [Domain] Other Miscellaneous Other Operating Income (Expense) Miscellaneous Other Operating Income (Expense) Loans to key management personnel Loans To Key Management Personnel [Member] Loans To Key Management Personnel RELATED PARTY TRANSACTIONS (Tables) -Schedule of Deposits [Table] RELATED PARTY TRANSACTIONS (Tables) [Table] Probability of default [Axis] Probability of default [axis] Annuities, protection and other Annuities, Protection And Other [Member] Annuities, Protection And Other NET FEE AND COMMISSION INCOME (Details) - 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Narrative [Table] DIVIDENDS ON ORDINARY SHARES (Details) [Table] Effects of risk mitigation option Increase (decrease) in profit (loss) due to reasonably possible decrease in risk variable that arises from contracts within scope of IFRS 17, insurance contracts issued before mitigation by reinsurance contracts held 3 to 12 months £m Later than three months and not later than one year [member] Assets Assets [abstract] DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of amounts reclassified from reserves to income statement [Line Items] DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of amounts reclassified from reserves to income statement [Line Items] DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of amounts reclassified from reserves to income statement [Line Items] Net investment return and finance result in respect of insurance and investment contracts Net investment return and finance result in respect of insurance and investment contracts Income (Expense) From Insurance and Investment Contracts Issued, Recognised in Profit or Loss Income (Expense) From Insurance and Investment Contracts Issued, Recognised in Profit or Loss Schedule of Non-Cash and Other Items DisclosureOfNoncashAndOtherItemstextBlock [Table Text Block] Transfers into Level 3 of fair value hierarchy, liabilities Transfers into Level 3 of fair value hierarchy, liabilities Net interest income Disclosure of interest income (expense) [text block] OTHER INTANGIBLE ASSETS (Details) - 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Provisions £m Provisions [Member] Provisions $1,500,000,000 5.721% Senior Callable Fixed-to-Fixed Rate Notes due 2030 $1,500,000,000 5.721% Senior Callable Fixed-to-Fixed Rate Notes due 2030 [Member] $1,500,000,000 5.721% Senior Callable Fixed-to-Fixed Rate Notes due 2030 Number of options, exercised or lapsed (in options) Number Of Share Options Exercised Or Lapsed In Share-based Payment Arrangement Number Of Share Options Exercised Or Lapsed In Share-based Payment Arrangement Services provided after balance sheet date Services Provided After Balance Sheet Date [Member] Issued during the year: IssuedInTheYearAbstract [Abstract] Interest paid on subordinated liabilities Interest paid, classified as financing activities Interest paid, classified as financing activities A £m Energy Performance Certificate Profile A [Member] Energy Performance Certificate Profile A OTHER LIABILITIES (Details) - Schedule of Other Liabilities [Table] OTHER LIABILITIES (Details) - Schedule of Other Liabilities [Table] UK Bank Rate – modelled Key Assumption Of Interest Rate Modelled Key Assumption Of Interest Rate Modelled Capitalised software enhancements £m Computer software [member] Credit impairment of financial instruments [axis] Credit impairment of financial instruments [axis] RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Retirement Benefit Charges to Income Statement [Table] RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Retirement Benefit Charges to Income Statement [Table] Schedule of Fee and Commission Income [Abstract] Schedule of Fee and Commission Income [Abstract] Reserves within equity [Axis] Reserves within equity [axis] Liquidity Adjustment Liquidity Adjustment [Member] Liquidity Adjustment Cash flows from investing activities Cash flows from (used in) investing activities [abstract] Salaries and social security costs Short-term employee benefits expense $1,250,000,000 4.550% Senior Notes due 2028 $1,500,000,000 4.375% Senior Notes due 2028 [Member] $1,500,000,000 4.375% Senior Notes due 2028 Liabilities arising from non-participating investment contracts Liabilities arising from non-participating investment contracts Investment contracts liabilities Dividends proposed or declared before financial statements authorised for issue (in GBP per share) Dividends proposed or declared before financial statements authorised for issue but not recognised as distribution to owners per share Weighting percentage applied in ECL calculation Weighting Percentage Applied In Expected Credit Loss Calculation Weighting Percentage Applied In Expected Credit Loss Calculation 4.375% Fixed Rate Reset Dated Subordinated Notes 2034 (€500 million) 4.375% Fixed Rate Reset Dated Subordinated Notes Due 2034 [Member] 4.375% Fixed Rate Reset Dated Subordinated Notes Due 2034 SHARE-BASED PAYMENTS (Details) - Narrative [Line Items] SHARE-BASED PAYMENTS (Details) [Line Items] Cash and cash equivalents Description of accounting policy for determining components of cash and cash equivalents [text block] £500,000,000 1.985% Subordinated Notes due 2031 £500,000,000 1.985% Subordinated Notes due 2031 [Member] £500,000,000 1.985% Subordinated Notes due 2031 F £m Energy Performance Certificate Profile F [Member] Energy Performance Certificate Profile F Income from continuing involvement in derecognised financial assets cumulatively recognised Income from continuing involvement in derecognised financial assets cumulatively recognised Movements in foreign currency translation reserve, net of tax Other comprehensive income, net of tax, exchange differences on translation of foreign operations FINANCIAL RISK MANAGEMENT (Details) - Schedule of Derivative Assets [Table] FINANCIAL RISK MANAGEMENT (Details) - Schedule of Derivative Assets [Table] FINANCIAL RISK MANAGEMENT (Details) - Schedule of Derivative Assets [Table] Percentage of voting rights represented Percentage Of Entity's Voting Rights Represented Percentage Of Entity's Voting Rights Represented Asset revaluations £m Revaluation Of Assets2 [Member] Cash-generating units [axis] Cash-generating units [axis] Actuarial assumptions [domain] Actuarial assumptions [domain] Up to 1 month £m Not later than one month [member] Schedule of Finance Lease Receivables Contractual Obligation, Fiscal Year Maturity [Table Text Block] Audit Information [Abstract] Audit Information Effects of exchange rate changes on cash and cash equivalents Effect of exchange rate changes on cash and cash equivalents Foreign currency translation Description of accounting policy for foreign currency translation [text block] CMS 19 CMS 19 [Member] (E) Summary of contractual service margin and risk adjustment (H) Life business contractual service margin run-off Disclosure of information about expected recognition of contractual service margin in profit or loss [text block] Percentage of reasonably possible increase in actuarial assumption (in percent) Percentage of reasonably possible increase in actuarial assumption Channel Islands Channel Islands [Member] Channel Islands Total debt securities in issue Debt instruments issued Disclosure of detailed information about financial instruments [table] Disclosure of detailed information about financial instruments [table] Proportion of voting rights held by non-controlling interests (in percent) Proportion of voting rights held by non-controlling interests 2 RMS Grade 2 [Member] RMS Grade 2 Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items] Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items] Preference shares, nominal value 25 pence each Preference Shares, Nominal Value 25 Pence Each [Member] Preference Shares, Nominal Value 25 Pence Each Additional longevity insurance arrangement entered into Additional Longevity Insurance Arrangement Entered Into [Member] Additional Longevity Insurance Arrangement Entered Into Other changes in credit quality Other movements (cash and non-cash) Increase (decrease) through other movements, financial assets Schedule of Reconciliation of Group Funding to the Balance Sheet Disclosure of additional information about understanding financial position and liquidity of entity [text block] Other £m Other Income1 [Member] Covered bond program [Domain] CoveredBondProgram [Domain] Entity interactive data current Entity Interactive Data Current Lapse rate for longstanding business Lapse Rate For Longstanding Business Lapse Rate For Longstanding Business Tax paid Tax paid Income taxes paid, classified as operating activities Disclosure of attribution of expenses by nature to their function [line items] Disclosure of attribution of expenses by nature to their function [line items] (F) Reconciliation of measurement components of insurance contract balances Disclosure of reconciliation of changes in insurance contracts by components [text block] Exchange and other adjustments Increase (decrease) through net exchange differences, investment property Individually assessed £m Expected credit losses individually assessed [member] SHARE-BASED PAYMENTS (Details) - Schedule of Shares under CFO Buyout [Table] SHARE-BASED PAYMENTS (Details) - Schedule of Shares under CFO Buyout [Table] Levels of fair value hierarchy [Axis] Levels of fair value hierarchy [axis] Offset Description of accounting policy for offsetting of financial instruments [text block] Contracts under the fair value transition approach Contractual service margin related to contracts that existed at transition date to which fair value approach has been applied [member] Disposal of tangible fixed assets Disposal Of Tangible Fixed Assets [Member] Liabilities £m Carrying Value Of Associated Liabilities [Member] Loss given default alignment Loss Given Default Alignment (LGD) [Member] Loss Given Default Alignment (LGD) Hedged item affected income statement £m HedgedItemAffectedIncomeStatement SUBORDINATED LIABILITIES (Details) - Schedule of Movement in Subordinated Liabilities [Line Items] SUBORDINATED LIABILITIES (Details) - Schedule of Movement in Subordinated Liabilities [Line Items] SUBORDINATED LIABILITIES (Details) - Schedule of Movement in Subordinated Liabilities [Line Items] UK UK [Member] Investments accounted for using equity method [member] Investments accounted for using equity method [member] Net expense from reinsurance contracts held Income (expenses) from reinsurance contracts held, other than finance income (expenses) Master netting and similar agreements £m Master Netting And Similar Agreements [Member] Master Netting And Similar Agreements Additional information about nature of and changes in risks associated with interests in structured entities [text block] Additional information about nature of and changes in risks associated with interests in structured entities [text block] Entity central index key Entity Central Index Key Change in stake of non-controlling interests Payments (Proceeds) From Changes In Ownership Interests In Subsidiaries Payments (Proceeds) From Changes In Ownership Interests In Subsidiaries Increase of 0.25% Quarter Percent Increase [Member] Quarter Percent Increase Schedule of Analysis of Cash and Cash Equivalents as Shown in the Balance Sheet Disclosure of cash and cash equivalents [text block] FINANCE LEASE RECEIVABLES (Details) - 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Schedule of Future Minimum Rentals Receivable under Non-Cancellable Operating Leases [Table] PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Future Minimum Rentals Receivable under Non-Cancellable Operating Leases [Table] Type of measurement of expected credit losses [axis] Type of measurement of expected credit losses [axis] Adjustments in respect of prior years Adjustments for current tax of prior periods Financial assets held at amortised cost Interest revenue for financial assets measured at amortised cost Disclosure of cash flow statement [text block] [Abstract] Disclosure of cash flow statement [Abstract] Gross drawn exposures Drawn Balance [Member] D £m Energy Performance Certificate Profile D [Member] Energy Performance Certificate Profile D Other public sector securities Other Public Sector Securities Schedule of Retirement Benefits Amounts Recognized in Balance Sheet and Change in Fair Value of Scheme Assets Disclosure of analysis of present value of defined benefit obligation that distinguishes nature, characteristics and risks [text block] Foreign currency translation reserve Movements In Foreign Currency Translation Reserve [Abstract] Movements In Foreign Currency Translation Reserve PD boundary % (in percent) Financial Instrument, PD Boundary Percentage Financial Instrument, PD Boundary Percentage Differences in overseas tax rates Tax effect of foreign tax rates 70% to 80% Seventy Percent To Eighty Percent [Member] Maximum employer contribution to matching shares scheme MaximumEmployerContributionToMatchingSharesScheme Value of shares purchased by employees the Group will match per month. Reduced growth rate used to extrapolate cash flow projections (in percent) Reduced Growth Rate Used To Extrapolate Cash Flow Projections Reduced Growth Rate Used To Extrapolate Cash Flow Projections Losses before tax Other comprehensive income, before tax, change in fair value of financial liability attributable to change in credit risk of liability Other comprehensive income, before tax, change in fair value of financial liability attributable to change in credit risk of liability Valuation adjustment [Domain] ValuationAdjustment [Domain] Purchases (additions) Purchases, fair value measurement, liabilities Capital expenditure contracted for but not recognised CapitalExpenditureContractedForButNotRecognised Disclosure of subordinated liabilities [text block] [Abstract] Disclosure of subordinated liabilities [Abstract] 9.25% Non-cumulative Irredeemable Preference shares of GBP0.25 9.25% Non-Cumulative Irredeemable Preference Shares [Member] 9.25% Non-Cumulative Irredeemable Preference Shares Cash consideration Portion of consideration paid (received) consisting of cash and cash equivalents Preference shares with voting rights (in percent) Percentage of Preference Shares with Voting Rights Percentage of Preference Shares with Voting Rights Total risk adjustment Risk Adjustment Risk Adjustment Total non-derivative financial liabilities Non-derivative financial liabilities, undiscounted cash flows Total CSM Contractual service margin Contractual service margin Commercial loans Secured Commercial Lending [Member] Adjustments in respect of prior years Adjustments for deferred tax of prior periods Rate of salary increases (in percent) Actuarial assumption of expected rates of salary increases Vesting period Share-Based Payment Arrangements, Vesting Period Share-Based Payment Arrangements, Vesting Period Classes of commitments [Domain] ClassesOfCommitments [Domain] Prepayments Prepayments Deferred tax assets, expiration term DeferredTaxAssetsExpirationTerm Proceeds from issue of ordinary shares Proceeds from issue of ordinary shares Classes of contingent liabilities [domain] Classes of contingent liabilities [domain] Notes in circulation Notes In Circulation Provisions in relation to loan commitments and financial guarantees Financial Guarantees And Loan Commitments [Member] Financial Guarantees And Loan Commitments Senior unsecured notes issued Senior Unsecured Notes Issued [Member] Senior Unsecured Notes Issued Document shell company report Document Shell Company Report Deferred tax Income tax relating to investments in equity instruments included in other comprehensive income STRUCTURED ENTITIES (Details) - Narrative [Line Items] STRUCTURED ENTITIES (Details) [Line Items] Employer contributions Decrease (increase) in net defined benefit liability (asset) resulting from resulting from contributions to plan by employer Asset-backed securities Asset-backed debt instruments held Number of employees Average number of employees Hedge accounting Description of accounting policy for derivative financial instruments and hedging [text block] Transfers of financial assets Disclosure of transferred financial assets that are not derecognised in their entirety [text block] Accretion of discounts and amortisation of premiums and issue costs Accretion Of Discounts And Amortisation Of Premiums And Issue Costs Accretion of discounts and amortisation of premiums and issue costs Movement in treasury shares Increase (decrease) through treasury share transactions, equity Schedule of Statutory Position and Tax Disclosure DisclosureOfDeferredTaxes [Table Text Block] Operating lease assets Property, plant and equipment subject to operating leases [member] Charges to funds in respect of policyholder tax and other Insurance revenue, other amounts Rate of inflation: RateOfInflationAbstract [Abstract] Discount rates (in percent) Actuarial assumption of discount rates Derivatives designated as hedging instruments £m Derivatives Designated As Hedging Instruments [Member] Types of financial liabilities [Axis] Types of financial liabilities [axis] £750 million 7.5% Fixed Rate Reset Additional Tier 1 Perpetual Subordinated Contingent Convertible Securities callable 2030 7.5% Convertible Securities Callable 2030 [Member] 7.5% Convertible Securities Callable 2030 FINANCIAL RISK MANAGEMENT (Details) - Schedule of Liabilities Arising From Insurance and Participating Investment Contracts [Table] FINANCIAL RISK MANAGEMENT (Details) - Schedule of Liabilities Arising From Insurance and Participating Investment Contracts [Table] Financial assets at fair value through other comprehensive income Financial assets at fair value through other comprehensive income Change in operating assets Change In Operating Assets Security arrangements assets held Security Arrangements Assets Held, Defined Benefits Schemes Security Arrangements Assets Held, Defined Benefits Schemes Subordinated liabilities Disclosure of subordinated liabilities [text block] Goodwill and other intangible assets Disclosure of intangible assets and goodwill [text block] Gains recognised in the income statement within other income (Losses) gains recognised in the income statement within other income Gains (losses) recognised in profit or loss including exchange differences, fair value measurement, assets DEBT SECURITIES IN ISSUE (Details) - Schedule of Debt Securities in Issue [Line Items] DEBT SECURITIES IN ISSUE (Details) - Schedule of Debt Securities [Line Items] DEBT SECURITIES IN ISSUE (Details) - Schedule of Debt Securities CPI inflation - adjusted Key Assumption Of CPI Inflation Adjusted Key Assumption Of CPI Inflation Adjusted 5 year Five Years [Member] Five Years Long-term assurance business £m Longterm Assurance Business Adjustment, Netting [Member] Longterm Assurance Business Adjustment, Netting At 1 January At 31 December Provisions Other provisions Other temporary differences £m Other temporary differences [member] Options and shares granted Options and Shares Granted [Member] Options and Shares Granted ECL impact ECL impact Sensitivity Analysis For Types Of Climate Risk, Reasonably Possible Change In Risk Variable, Impact On Allowance For Credit Loss Sensitivity Analysis For Types Of Climate Risk, Reasonably Possible Change In Risk Variable, Impact On Allowance For Credit Loss Disclosure of reserves within equity [line items] Disclosure of reserves within equity [line items] Significant unobservable input, liabilities Significant unobservable input, liabilities Cash flow statement Disclosure of cash flow statement [text block] Cash-generating units [domain] Cash-generating units [domain] Events since the balance sheet date Disclosure of events after reporting period [text block] Disclosure of information about defined benefit plans [abstract] Disclosure of information about defined benefit plans [abstract] Disclosure of unconsolidated structured entities [line items] Disclosure of unconsolidated structured entities [line items] Asset-backed securities Asset Backed Debt Securities [Member] Asset Backed Debt Securities Deferred bonus plan Deferred Bonus Plan [Member] Deferred Bonus Plan Deferred tax asset duration [Axis] Deferred Tax Asset Duration [Axis] Cash flows from operating activities Cash flows from (used in) operating activities [abstract] Share of post-tax results of associates and joint ventures Share of profit (loss) of associates and joint ventures accounted for using equity method Schroder Wealth Holdings Limited Schroder Wealth Holdings Limited [Member] Indemnities and other matters relating to legacy business disposals Indemnities And Other Matters Relating To Legacy Business Disposals [Member] Long Term Share Plan LTIP [Member] Document period end date Document Period End Date Underlying asset including property prices Underlying Asset or Net Asset Value incl. Property Prices, Broker Quotes Or Discounted Cash Flow [Member] Loans and advances to customers Loans And Advances To Customers [Member] BLT Properties BLT Properties [Member] BLT Properties Non-adjusting events after reporting period [domain] Non-adjusting events after reporting period [domain] Mining and quarrying Mining and Quarrying [Member] Mining and Quarrying Residual value and voluntary impairment charges Residual Value And Voluntary Impairment Charges Residual Value And Voluntary Impairment Charges Type of fee and commission income [Axis] Type Of Fee And Commission Income [Axis] Other (charge) to equity Deferred tax relating to items credited (charged) directly to equity FINANCIAL RISK MANAGEMENT (Details) - Schedule of Securities Lending Transactions [Table] FINANCIAL RISK MANAGEMENT (Details) - Schedule of Securities Lending Transactions [Table] Insurance claims Insurance Claims1 [Member] Classes of financial instruments [Axis] Classes of financial instruments [axis] RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Retirement Benefit Total Amounts Recognized in Balance Sheet [Line Items] RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Retirement Benefit Total Amounts Recognized in Balance Sheet [Line Items] Non-deductible costs: bank levy Bank and similar charges Disclosure of Detailed Information about Allowance for Expected Credit Losses Disclosure Of Detailed Information About Allowance For Expected Credit Losses Explanatory [Table Text Block] Disclosure Of Detailed Information About Allowance For Expected Credit Losses Explanatory FINANCIAL INSTRUMENTS (Details) - Schedule of Financial Assets and Liabilites [Line Items] FINANCIAL INSTRUMENTS (Details) - Schedule of Financial Assets and Liabilites [Line Items] FINANCIAL INSTRUMENTS (Details) - Schedule of Financial Assets and Liabilites [Line Items] Schedule of Performance-Based Compensation Costs DisclosureOfPerformancebasedCompensationCosts [Table Text Block] Financial, business and other services Financial Business And Other Services [Member] Expense from share-based payment transactions with employees Expense from share-based payment transactions with employees Reverse repurchase agreements held at fair value Reverse Repurchase Agreement [Member] Product and Service [Axis] Product and Service [Axis] Classes of financial assets [Axis] Classes of financial assets [axis] $300,000,000 Senior Callable Floating Rate Notes due 2031 $300,000,000 Senior Callable Floating Rate Notes due 2031 [Member] $300,000,000 Senior Callable Floating Rate Notes due 2031 RELATED PARTY TRANSACTIONS (Details) - Narrative [Line Items] RELATED PARTY TRANSACTIONS (Details) - Key Management Personnel [Line Items] Amortisation of insurance acquisition cash flows Amortisation of insurance acquisition cash flows Increase (decrease) through amortisation of insurance acquisition cash flows, insurance contracts liability (asset) Brands £m Brand names [member] Total comprehensive income attributable to other equity holders Comprehensive Income Attributable To Other Equity Holders Tax refunded Income taxes refund, classified as operating activities At 1 January At 31 December Reserve of cash flow hedges Current contract liabilities Current contract liabilities Reclassification adjustments on cash flow hedges, net of tax Reclassification adjustments on cash flow hedges, net of tax Statistical Measurement [Axis] Statistical Measurement [Axis] Revenue of combined entity as if combination occurred at beginning of period Revenue of combined entity as if combination occurred at beginning of period FINANCIAL INSTRUMENTS (Details) - 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Schedule of Analysis of Defined Benefit Obligations [Line Items] RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Analysis of Defined Benefit Obligation [Line Items] Schedule of Operating Segments DisclosureOfOperatingSegmentsTextBlock [Table Text Block] DEFERRED TAX (Details) - Narrative [Line Items] DEFERRED TAX (Details) [Line Items] Liquidity risk Disclosure of liquidity risk [text block] Schedule of Other Operating Income Disclosure of other operating income [text block] Amount contractually payable on debt securities held at fair value through profit or loss AmountContractuallyPayableOnDebtSecuritiesHeldAtFairValueThroughProfitOrLoss Type of settled derivative [Axis] Type Of Settled Derivative [Axis] Type of Funding [Domain] Type of Funding [Domain] Type of Funding [Domain] $1,250,000,000 5.087% Senior Callable Fixed-to-Fixed Rate Notes due 2028 $1,250,000,000 5.087% Senior Callable Fixed-to-Fixed Rate Notes due 2028 [Member] $1,250,000,000 5.087% Senior Callable Fixed-to-Fixed Rate Notes due 2028 CPI inflation – modelled Key Assumption Of CPI Inflation Modelled Key Assumption Of CPI Inflation Modelled Expected claims and other insurance service expenses Insurance Revenue, Expected Incurred Claims And Other Insurance Services Expenses Insurance Revenue, Expected Incurred Claims And Other Insurance Services Expenses (A) Insurance service result Disclosure of analysis of insurance revenue [text block] Percentage of mortgage portfolio Percentage Of Mortgage Portfolio For Which No EPC Data Available Percentage Of Mortgage Portfolio For Which No EPC Data Available Insurance underwriting risk [Abstract] Insurance underwriting risk [Abstract] Insurance underwriting risk [Abstract] Energy and water supply Energy And Water Supply [Member] Classes of financial instruments [domain] Classes of financial instruments [domain] Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items] Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items] Exchange rate contracts Exchange Rate Contracts [Member] Insurance acquisition cash flows Estimates of present value of insurance acquisition cash flows [member] Maximum exposure to loss from interests in structured entities Maximum exposure to loss from interests in structured entities Acquisitions Increase (decrease) through business combinations, deferred tax liability (asset) Total other items Total Adjustments For Other Items Other public sector securities Other Public Sector Debt Securities [Member] Other Public Sector Debt Securities Insurance- related contracts £m Insurance contracts [domain] Insurance contracts [domain] Total Equity Attributable To Ordinary Shareholders [Member] Equity Attributable To Ordinary Shareholders Claims and other directly attributable expenses Estimates of present value of future cash outflows other than insurance acquisition cash flows [member] Increase in fair value measurement, liabilities Increase (decrease) in fair value measurement, liabilities RMS 7–9 RMS 7-9 [Member] Entitlement to dividends [Axis] Entitlement To Dividends [Axis] Lead manager or broker quote/consensus pricing Lead Manager, Broker quote Or Consensus Pricing [Member] Schedule of Liabilities Arising From Insurance and Participating Investment Contracts MaturityAnalysisForCommitmentsAndContingentLiabilities [Table Text Block] Disclosure Of Other Equity Instruments Explanatory [Abstract] Disclosure Of Other Equity Instruments Explanatory [Abstract] Other reserves Total other reserves at 31 December Other reserves RELATED PARTY TRANSACTIONS (Tables) - Schedule of Deposits [Line Items] RELATED PARTY TRANSACTIONS (Tables) [Line Items] Net investment return on assets held to back non-participating investment contracts Net Investment Return on Assets Held to Back Non-participating Investment Contracts Net Investment Return on Assets Held to Back Non-participating Investment Contracts Underlying Basis Underlying Basis [Member] Financial assets at fair value through profit or loss, mandatorily measured at fair value, other than those classified as held for trading Financial assets at fair value through profit or loss, mandatorily measured at fair value, other than those classified as held for trading Number of options exercisable, end of period (in options) Number of share options exercisable in share-based payment arrangement Loans and receivables Loans And Receivables [Member] Other Insurance, Pensions and Investments - Other [Member] Insurance, Pensions and Investments - Other POCI £m Financial instruments purchased or originated credit-impaired [member] Life expectancy [Domain] LifeExpectancy [Domain] Net cash used in financing activities Cash flows from (used in) financing activities Cash flows from (used in) financing activities £750 million 8.5% Fixed Rate Reset Additional Tier 1 Perpetual Subordinated Contingent Convertible Securities Callable 2028 8.5% Convertible Securities Callable 2028 [Member] 8.5% Convertible Securities Callable 2028 Preference shares £m Preference shares [member] At 31 December Plan assets, at fair value Treasury and other bills Treasury shares Statement of changes in equity [table] Statement of changes in equity [table] Actuarial assumptions [Axis] Actuarial assumptions [axis] DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] Net settled derivative liabilities NetSettledDerivativesLiabilities Liquidity risk [Abstract] Liquidity risk [Abstract] Liquidity risk [Abstract] Loans and advances to customers Interest income on loans and advances to customers Bank balances at central banks other than mandatory reserve deposits Bank balances at central banks other than mandatory reserve deposits Percentage of entity goodwill (in percent) PercentageOfEntityGoodwill Credit and debit card fees Credit And Debit Card Fees [Member] Insurance premiums paid Decrease In Net Defined Benefit Liability (Asset) Resulting From Insurance Premium Paid Decrease In Net Defined Benefit Liability (Asset) Resulting From Insurance Premium Paid Discount rates pre tax Description Of Discount Rates Applied To Cash Flow Projections Pre Tax Description Of Discount Rates Applied To Cash Flow Projections Pre Tax Classes of assets [domain] Classes of assets [domain] Proceeds from sale of property, plant and equipment Proceeds from sales of property, plant and equipment, classified as investing activities Debt securities Interest income on debt instruments held SHARE-BASED PAYMENTS (Details) - Schedule of Assumptions Used for Calculating Benefit Plans [Line Items] SHARE-BASED PAYMENTS (Details) - Schedule of Assumptions Used for Calculating Benefit Plans [Line Items] Types of hedges [domain] Types of hedges [domain] Stage 1 £m Stage 1 [Member] Bottom of range Bottom of range [member] Cancara Cancara [Member] Categories of related parties [Axis] Categories of related parties [axis] Negative interest rates Negative Interest Rates [Member] Classes of commitments [Axis] Classes Of Commitments [Axis] Profit for the year Profit for the year Profit (loss) Disclosure of issued capital [text block] [Abstract] Disclosure of issued capital [Abstract] Other comprehensive income, net of tax, cash flow hedges Movements in cash flow hedge reserve, net of tax Other comprehensive income, net of tax, cash flow hedges Increase (decrease) in insurance contracts liability (asset) Increase (decrease) in insurance contracts liability (asset) Effect of reasonably possible alternative assumptions [Domain] EffectOfReasonablyPossibleAlternativeAssumptions [Domain] SAYE Save As You Earn [Member] SEGMENTAL ANALYSIS (Details) - Schedule of Operating Segments [Line Items] SEGMENTAL ANALYSIS (Details) - Schedule of Operating Segments [Line Items] Lease financing Gross And Lease Financing [Member] Interest income: Total Interest Income [Abstract] Total Interest Income Current accounts Current Accounts [Member] Document registration statement Document Registration Statement Insurance, Pensions and Investments £m Insurance, Pensions and Investments £m Insurance, Pensions and Investments [Member] Segmental analysis Disclosure of entity's operating segments [text block] Depreciation charge for the year Depreciation, right-of-use assets House price growth KeyAssumptionOfHousePriceGrowth KeyAssumptionOfHousePriceGrowth OFFSETTING OF FINANCIAL ASSETS AND LIABILITIES (Details) - Schedule of Offsetting of Financial Assets and Liabilities [Table] OFFSETTING OF FINANCIAL ASSETS AND LIABILITIES (Details) - Schedule of Offsetting of Financial Assets and Liabilities [Table] Physical risk Physical Risk [Member] Physical Risk Relating to future services Increase (decrease) through changes that relate to future service, insurance contracts liability (asset) [abstract] RMS 11–13 RMS 11-13 [Member] Net liabilities Insurance Contracts Issued That Are Liabilities, Net of Insurance Acquisition Assets Insurance Contracts Issued That Are Liabilities, Net of Insurance Acquisition Assets Other non-cash items Other Noncash Items Other non-cash items Disclosure of contingent liabilities [table] Disclosure of contingent liabilities [table] Present value of funded obligations Present value of defined benefit obligation [member] Net gains (losses) on financial assets and liabilities at fair value through profit or loss Net Gain Loss On Assets And Liabilities At Fair Value Through Profit Or Loss And Trading Leases Description of accounting policy for leases [text block] PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Future Minimum Rentals Receivable under Non-Cancellable Operating Leases [Line Items] PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Future Minimum Rentals Receivable under Non-Cancellable Operating Leases [Line Items] Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [table] Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [table] Fee and commission income: Fee and commission income [abstract] Analysis of income and expense [abstract] Analysis of income and expense [abstract] Business contact Business Contact [Member] Long-term assurance business £m Longterm Assurance Business Adjustment [Member] Performance 2021 Performance 2021 [Member] Performance 2019 Liabilities Liabilities [abstract] Contracts under the modified retrospective approach Contractual service margin related to contracts that existed at transition date to which modified retrospective approach has been applied [member] Disclosure of commitments and contingent liabilities [text block] [Abstract] Disclosure of commitments and contingent liabilities [Abstract] Carrying amount [member] Carrying amount [member] Money market instruments, cash, derivatives and other assets and liabilities Other Assets (Liabilities) Amount Contributed To Fair Value Of Plan Assets Other Assets (Liabilities) Amount Contributed To Fair Value Of Plan Assets (Charge) credit to the income statement Deferred Tax Assets Credited (Charged) Directly To Income Statement Variable rate [Axis] Rate, Variable [Axis] Weighted average exercise price, expired (in GBP per option) Weighted average exercise price of share options expired in share-based payment arrangement Group Chief Executive Buyout Group Chief Executive Buyout [Member] Group Chief Executive Buyout Carrying amount of the hedged item, liabilities Hedged item, liabilities Liabilities arising from insurance and participating investment contracts Insurance contracts issued that are liabilities Security exchange name Security Exchange Name Charge for the year Current service cost, defined benefit plans Insurance contracts by components [Axis] Insurance contracts by components [axis] Total Retail Retail Financial Assets [Member] Retail Financial Assets Extension of modelled lifetime on retail revolving products Extension Of Modelled Lifetime On Retail Revolving Products [Member] 10pp increase in HPI £m HP I10pp Increase [Member] Unquoted £m Level 2 and 3 of fair value hierarchy [member] Net gains on financial assets and liabilities at fair value through profit or loss: Net Gains on Financial Assets and Liabilities at Fair Value Through Profit or Loss [Abstract] Net Gains on Financial Assets and Liabilities at Fair Value Through Profit or Loss Customer deposits Deposits From Customers And Repurchase Agreements Deposits From Customers And Repurchase Agreements Securitisation vehicles Securitisation vehicles [member] RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Maturity Analysis of Benefits Expected To Be Paid [Line Items] RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Maturity Analysis of Benefits Expected To Be Paid [Line Items] Disclosure of other operating income (expense) [text block] [Abstract] Disclosure of other operating income (expense) [Abstract] ££500 million 5.125% Fixed Rate Reset Additional Tier 1 Perpetual Subordinated Contingent Convertible Securities Callable 2024 5.125% Convertible Securities Callable 2024 [Member] 5.125% Convertible Securities Callable 2024 Derivative instrument risk [Axis] Derivative Instrument Risk1 [Axis] Level 3 financial assets carried at fair value Level 3 financial assets carried at fair value Financial assets, at fair value Type of disclosure [Axis] Type Of Disclosure [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] Security reporting obligation Security Reporting Obligation Inter-segment (expense) income IntersegmentIncome Debt instrument term Debt Instrument Term1 Capital risk [Abstract] Capital risk [Abstract] Capital risk [Abstract] External income ExternalIncome The income earned from outside the Group i.e. before intragroup commissions / allocations etc. Charge for the year Increase in net defined benefit liability (asset) resulting from current service cost Liabilities arising from financing activities [Axis] Liabilities arising from financing activities [axis] Remaining contractual undiscounted cash outflows (inflows) that arise from contracts within scope of IFRS 17 that are liabilities Remaining contractual undiscounted cash outflows (inflows) that arise from contracts within scope of IFRS 17 that are liabilities Valuation Allowance By Deferred Tax Asset [Domain] Valuation Allowance By Deferred Tax Asset [Domain] Valuation Allowance By Deferred Tax Asset [Domain] Operating expenses Operating costs Total operating expenses Operating expense Useful life measured as period of time, intangible assets other than goodwill Useful life measured as period of time, intangible assets other than goodwill TRANSFERS OF FINANCIAL ASSETS (Details) - Schedule of Transfered Assets and Liabilities [Table] TRANSFERS OF FINANCIAL ASSETS (Details) - Schedule of Transferred Assets and Liabilities [Table] Profit for the year attributable to other equity holders Profit (Loss), Other Equity Instruments Profit (Loss), Other Equity Instruments Type of pooled investment vehicle [Domain] TypeOfPooledInvestmentVehicle [Domain] Number of share options, exercised (in options) Exercised (in options) Vested (in shares) Number of share options exercised in share-based payment arrangement Insurance contract assets Insurance contracts issued that are assets Other non-deductible costs Tax effect of expense not deductible in determining taxable profit (tax loss) Pension assets £m Pension Assets [Member] Equity funds Equity Fund1 [Member] Equity Fund1 Entity addresses, address type [Axis] Entity Addresses, Address Type [Axis] Current tax Current Tax Relating To Remeasurements Of Defined Benefit Plans Of Other Comprehensive Income Current Tax Relating To Remeasurements Of Defined Benefit Plans Of Other Comprehensive Income At 1 January At 31 December Property, plant and equipment: Property, plant and equipment Other equity instruments Other equity interest PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Property, Plant and Equipment [Line Items] PROPERTY, PLANT AND EQUIPMENT (Details) - Schedule of Property, Plant and Equipment [Line Items] Changes that relate to past service: adjustment to liabilities for incurred claims Relating to past services Increase (decrease) through changes that relate to past service, insurance contracts liability (asset) Tax losses £m Tax Losses [Member] Fully loaded common equity Tier 1 ratio (in percent) Fully Loaded Common Equity Tier 1 Ratio Fully Loaded Common Equity Tier 1 Ratio FINANCIAL INSTRUMENTS (Details) - Schedule of Valuation Hierarchy for Financial Assets [Line Items] FINANCIAL INSTRUMENTS (Details) - Schedule of Valuation Hierarchy for Financial Assets [Line Items] Duration of the defined benefit obligation Weighted average duration of defined benefit obligation Corporate and Institutional Banking Commercial Banking - Corporate and Institutional Banking [Member] Commercial Banking - Corporate and Institutional Banking Other assets Total other assets Other assets Items that will not subsequently be reclassified to profit or loss: Components of other comprehensive income that will not be reclassified to profit or loss, net of tax [abstract] Quoted £m Level 1 £m Level 1 of fair value hierarchy [member] Number of options, granted (in options) Granted (in shares) Number of share options granted in share-based payment arrangement Cash and cash equivalents held by entity unavailable for use by group Cash and cash equivalents held by entity unavailable for use by group Credit spreads Credit Spreads [Member] Payments related to guarantees made by entity Payments Related To Guarantees Made By Entity, Related Party Transactions Payments Related To Guarantees Made By Entity, Related Party Transactions UK corporation tax: UK Corporation Tax [Member] Amount change [Axis] Amount Change [Axis] Start to trough Start To Trough [Member] Other comprehensive income location [Axis] Other Comprehensive Income Location1 [Axis] Disclosure of information about expected recognition of contractual service margin in profit or loss [table] Disclosure of information about expected recognition of contractual service margin in profit or loss [table] Schedule of Retail Credit Cards Disclosure Of Detailed Information About Retail Credit Cards [Table Text Block] Disclosure Of Detailed Information About Retail Credit Cards Changes in estimates that adjust the CSM Increase (decrease) through changes in estimates that adjust contractual service margin, insurance contracts liability (asset) Additions and repayments Increase (Decrease) Through Origination Or Purchase (Repayment), Financial Assets Increase (Decrease) Through Origination Or Purchase (Repayment), Financial Assets Change in derivative financial instruments GainsLossesInDerivativeFinancialInstrumentsAndLiabilitiesAtFairValueThroughProfitOrLoss Changes in fair value used for calculating hedge ineffectiveness £m Gain (loss) on change in fair value of hedged item used as basis for recognising hedge ineffectiveness Disclosure of employee benefits [text block] [Abstract] Disclosure of employee benefits [Abstract] Third quarter 2025 % Current Year Quarter Three [Member] Current Year Quarter Three Trading liabilities Financial liabilities at fair value through profit or loss that meet definition of held for trading Equity shares Equity instruments held UK bank levy UK Bank Levy UK bank levy Continuing involvement in derecognised financial assets by type of transfer [domain] Continuing involvement in derecognised financial assets by type of transfer [domain] RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Benefit Plan Member Life Expectancy [Table] RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Benefit Plan Member Life Expectancy [Table] Profitable contracts issued £m Increase (decrease) through effects of contracts acquired in period, insurance contracts liability (asset) Disclosure of related party [text block] [Abstract] Disclosure of related party [Abstract] USD denominated senior unsecured fixed rate note maturing 2030 USD denominated Senior Unsecured Fixed Rate Note Maturing 2030 [Member] USD denominated Senior Unsecured Fixed Rate Note Maturing 2030 Women Women [Member] Dated £m Dated Subordinated Liabilities [Member] Total liabilities designated at fair value through profit or loss Financial liabilities at fair value through profit or loss, designated upon initial recognition or subsequently Derecognition Consideration Decrease Through Disposal, Insurance Contracts Liability (Asset) Decrease Through Disposal, Insurance Contracts Liability (Asset) Other Other adjustments for non-cash items Interest rate Interest Rate [Member] Gain loss on sale of leased assets net operating leases Gain (Loss) On Sale Of Leased Assets Net Operating Leases1 The net gain (loss) arising from the lessor's sale of assets held- or available-for-lease under contractual arrangements classified as operating leases. Write-off of allowance for loan losses, net of recoveries Write off Of Impairment Allowances Recognised Against Loans And Advances Net Of Recoveries Judgemental adjustments £m Other Judgements, Netting [Member] Other Judgements, Netting Motor Business Cash Generating Unit Motor Business Cash Generating Unit [Member] Motor Business Cash Generating Unit $500,000,000 Senior Callable Floating Rate Notes due 2027 $500,000,000 Senior Callable Floating Rate Notes Due 2027 [Member] $500,000,000 Senior Callable Floating Rate Notes Due 2027 Net fee and commission income Fee and commission income (expense) Gain (loss) on hedge ineffectiveness recognised in profit or loss Hedge ineffectiveness recognised in the income statement £m Gain (loss) on hedge ineffectiveness recognised in profit or loss Continuing and discontinued operations [axis] Continuing and discontinued operations [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 Weighted average fair value at date of award of shares awarded to employees under matching shares scheme (in GBP per share) WeightedAverageFairValueAtDateOfAwardOfSharesAwardedToEmployeesUnderMatchingSharesScheme Weighted Average Fair Value At Date Of Award Of Shares Awarded To Employees Under Matching Shares Scheme Interest rate volatility Interest Rate Volatility [Member] Schedule of Operating Expenses Disclosure of other operating expense [text block] DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of the effects of hedge accounting [Table] DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of the effects of hedge accounting [Table] OTHER PROVISIONS (Details) - Schedule of Assumptions for Other Provisions [Table] OTHER PROVISIONS (Details) - Schedule of Assumptions for Other Provisions [Table] Schedule of Assumptions Used for Calculating Benefit Plans DisclosureOfShareBasedPaymentsAssumptionstextBlock [Table Text Block] Valuation adjustment [Axis] Valuation Adjustment [Axis] Retained profits Retained earnings Measurement [domain] Measurement [domain] Revaluation reserve in respect of debt securities held at fair value through other comprehensive income Revaluation Reserve in Respect of Debt Securities [Abstract] Revaluation Reserve in Respect of Debt Securities Unconsolidated structured entities [domain] Unconsolidated structured entities [domain] Not rated Not Rated [Member] Significant unobservable input, assets Significant unobservable input, assets Maximum number of shares to be awarded, percentage of annual salary Share-Based Payment Arrangements, Maximum Number Of Shares To Be Awarded, Percentage Of Annual Salary Share-Based Payment Arrangements, Maximum Number Of Shares To Be Awarded, Percentage Of Annual Salary Accumulated amount of fair value adjustment on the hedged item, assets Accumulated fair value hedge adjustment on hedged item included in carrying amount, assets Incurred claims and other directly attributable expenses Increase (decrease) through incurred claims and other incurred insurance service expenses, insurance contracts liability (asset) SHARE CAPITAL (Details) - Schedule of Issued and Fully Paid Share Capital [Line Items] SHARE CAPITAL (Details) - Schedule of Issued & Fully Paid Share Capital [Line Items] SHARE CAPITAL (Details) - Schedule of Issued and Fully Paid Share Capital [Line Items] Subordinated liabilities Interest expense and hedging valuation adjustments on subordinated liabilities Interest Expense On Subordinated Liabilities Types of risks [domain] Types of risks [domain] Climate risk factors Climate Risk Factors [Member] Climate Risk Factors Schedule Of Allowance Account For Credit Losses Of Financial Assets [Table] Schedule Of Allowance Account For Credit Losses Of Financial Assets [Table] Change in derivative financial instruments AdjustmentsForChangeInDerivativeFinancialInstrumentsTradingAndOtherFinancialAssetsAtFairValueThroughProfitOrLossToReconcileProfitLossToNetCashFlowFromUsedInOperating Type of accounting estimate [Domain] Accounting estimates [domain] Subsidiaries [Axis] Subsidiaries [axis] Exchange and other adjustments Adjustments For Exchange And Other Adjustments, Right-Of-Use Assets Adjustments For Exchange And Other Adjustments, Right-Of-Use Assets Type of Funding [Axis] Type of Funding [Axis] Type of Funding (Charge) credit to the income statement DeferredTaxLiabilitiesCreditedOrChargedDirectlyToIncomeStatement Total trading assets Financial assets at fair value through profit or loss, classified as held for trading (B) Net investment return on assets held to back insurance and investment contracts and net insurance finance (expense) income arising from insurance and investment contracts Schedule of Net Finance Income (Expense) From Insurance, Participating Investment and Reinsurance Contracts [Table Text Block] Schedule of Net Finance Income (Expense) From Insurance, Participating Investment and Reinsurance Contracts Schedule of Credit Quality of Assets Schedule Of Credit Quality Of Assets [Table Text Block] Segment analysis Description of accounting policy for segment reporting [text block] Confidence level used to determine risk adjustment for non-financial risk Confidence level used to determine risk adjustment for non-financial risk Net defined benefit liability (asset) [domain] Net defined benefit liability (asset) [domain] AUDITORS' REMUNERATION (Details) - Schedule of Fees Payable to Auditors by Outside Entities [Line Items] AUDITORS' REMUNERATION (Details) - Schedule of Fees Payable to Auditors by Outside Entities [Line Items] Insurance contracts by components [domain] Insurance contracts by components [domain] Customer deposits Deposits From Customers [Member] Interest expense: Interest costs [abstract] Accumulated fair value hedge adjustment on hedged item included in carrying amount, liabilities Accumulated fair value hedge adjustment on hedged item included in carrying amount, liabilities Deferred tax assets Deferred tax assets and liabilities [abstract] Entity common stock, shares outstanding (in shares) Entity Common Stock, Shares Outstanding Disclosure of derivative financial instruments [text block] [Abstract] Disclosure of derivative financial instruments [Abstract] Document Financial Statement Error Correction [Flag] Document Financial Statement Error Correction [Flag] Repurchases and redemptions during the year Expected cash outflow on redemption or repurchase of puttable financial instruments Expected cash outflow on redemption or repurchase of puttable financial instruments AUDITORS' REMUNERATION (Details) - Schedule of Fees Payable to Auditors by the Group [Line Items] AUDITORS' REMUNERATION (Details) - Schedule of Fees Payable to Auditors by the Group [Line Items] Income statement location [Axis] Income Statement Location1 [Axis] Greater than 100% Greater Than One Hundred Percent [Member] Disclosure of accounting judgements and estimates [text block] [Abstract] Disclosure of accounting judgements and estimates [Abstract] Classes of ordinary shares [Axis] Classes of ordinary shares [axis] At 1 January At 31 December Reserve of exchange differences on translation 5 RMS Grade 5 [Member] RMS Grade 5 Pension contributions Pension Contributions1 Pension Contributions1 Number of shares reserved for issue under options and contracts for sale of shares (in shares) Number of shares reserved for issue under options and contracts for sale of shares Acquired value of non-participating investment contract AcquiredValueOfNonParticipatingInvestmentContract Total equity and liabilities Equity and liabilities SHARE-BASED PAYMENTS (Details) - Schedule of Assumptions Used for Calculating Benefit Plans [Table] SHARE-BASED PAYMENTS (Details) - Schedule of Assumptions Used for Calculating Benefit Plans [Table] Exchange and other adjustments Increase (decrease) through net exchange differences, other provisions Management fee expense Management Fee Expense1 Management Fee Expense1 Business combinations Business combinations [domain] Impairment of financial assets Description of accounting policy for impairment of financial assets [text block] Unrated properties £m Energy Performance Certificate Profile Unrated Properties [Member] Energy Performance Certificate Profile Unrated Properties Outstanding commitments made by entity Outstanding commitments made by entity, related party transactions FINANCE LEASE RECEIVABLES (Details) - Schedule of Lease Receivable Balances [Line Items] FINANCE LEASE RECEIVABLES (Details) - Schedule of Lease Receivable Balances [Line Items] Exchange and other adjustments Increase (decrease) through foreign exchange and other movements, financial assets Schedule of Derivative Assets DisclosureOfDerivativeAssetstextBlock [Table Text Block] Insurance contract assets Insurance contract assets Insurance contract assets Insurance contracts that are assets Joint ventures [domain] Joint ventures [domain] Transactions in own shares Proceeds From (Payments For) Sale (Purchase) Of Treasury Shares Proceeds From (Payments For) Sale (Purchase) Of Treasury Shares RMS 4–6 RMS 4-6 [Member] Income from structured entities Income from structured entities Foreign exchange movements Increase (decrease) through effect of changes in foreign exchange rates, liabilities arising from financing activities Global tariff and geo-political disruption risks Global Tariff and Geo-Political Disruption Risks [Member] Global Tariff and Geo-Political Disruption Risks Infrastructure funds Infrastructure Funds [Member] Infrastructure Funds Income from continuing involvement in derecognised financial assets Income from continuing involvement in derecognised financial assets City area code City Area Code Restructuring provision Restructuring provision General insurance Insurance, Pensions and Investments - General Insurance [Member] Insurance, Pensions and Investments - General Insurance Fair values of financial assets and liabilities Disclosure of fair value of financial instruments [text block] Net investment return on assets held to back insurance and investment contracts Investment return on assets held to back insurance and investment contracts Increase (Decrease) Through Revenue, Insurance and Investment Contract Assets Increase (Decrease) Through Revenue, Insurance and Investment Contract Assets Useful life measured as period of time, property, plant and equipment Useful life measured as period of time, property, plant and equipment Less cash and cash equivalents acquired Cash and cash equivalents in subsidiary or businesses acquired or disposed Net finance expense in respect of insurance and investment contracts Total Income, Net of Net Finance Income in Respect of Insurance and Investment Contracts Categories of financial liabilities [Domain] Categories of financial liabilities [domain] Repurchases and redemptions of other equity instruments (note 33) Increase (decrease) through other changes, equity Men Men [Member] Percentage increase in rate Percentage Increase In Rate [Member] Percentage Increase In Rate Non-deductible costs: conduct charges NondeductibleCostsConductCharges Related party transactions Disclosure of related party [text block] Disclosure of trading income (expense) [text block] [Abstract] Disclosure of trading income (expense) [Abstract] Gains (losses) on financial assets measured at fair value through other comprehensive income, net of tax Gains (losses) on financial assets measured at fair value through other comprehensive income, net of tax Level 3 £m Level 3 of fair value hierarchy [member] Schedule of Change in Operating Assets DisclosureOfChangeInOperatingAssetstextBlock [Table Text Block] Impairment credit on undrawn balances Impairment charge relating to undrawn balances USD denominated senior unsecured floating rate note maturing 2030 USD denominated Senior Unsecured Floating Rate Note Maturing 2030 [Member] USD denominated Senior Unsecured Floating Rate Note Maturing 2030 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 Disclosure of classes of share capital [table] Disclosure of classes of share capital [table] 2029 % Four Years After Reporting Year [Member] Four Years After Reporting Year Advances written off Decrease through write-off, financial assets Protection plan [Domain] ProtectionPlan [Domain] Acquisition fair value £m Acquisition Fair Value [Member] Total transactions with owners Increase (decrease) through transactions with owners, equity Foreign exchange impact on balance sheet Foreign Exchange Impact On Balance Sheet2 Deposits Deposits1 [Abstract] SHARE-BASED PAYMENTS (Details) - Narrative [Table] SHARE-BASED PAYMENTS (Details) [Table] OFFSETTING OF FINANCIAL ASSETS AND LIABILITIES (Details) - Schedule of Offsetting of Financial Assets and Liabilities [Line Items] OFFSETTING OF FINANCIAL ASSETS AND LIABILITIES (Details) - Schedule of Offsetting of Financial Assets and Liabilities [Line Items] OFFSETTING OF FINANCIAL ASSETS AND LIABILITIES (Details) - Schedule of Offsetting of Financial Assets and Liabilities [Line Items] Options and shares granted in prior years Options and Shares Granted in Prior Years [Member] Options and Shares Granted in Prior Years SHARE-BASED PAYMENTS (Details) - Schedule of Shares under CFO Buyout [Line Items] SHARE-BASED PAYMENTS (Details) - Schedule of Shares under CFO Buyout [Line Items] Movements in cash flow hedge reserve: MovementInCashFlowHedgingReserve [Abstract] Hedged cash flows that will no longer occur £m HedgedCashflowsWillNoLongerOccur Provision for Pillar 2 current income taxes Current tax expense (income), related to Pillar Two income taxes $1,327,685,000 4.582% Subordinated Securities due 2025 $1,327,685,000 4.582% Subordinated Securities due 2025 [Member] $1,327,685,000 4.582% Subordinated Securities due 2025 On valuation date On Valuation Date [Member] Share-based payments Disclosure of share-based payment arrangements [text block] Disclosure of detailed information about intangible assets [abstract] Disclosure of detailed information about intangible assets [abstract] Schedule of Other Assets Disclosure of prepayments and other assets [text block] Credit to other comprehensive income DeferredTaxLiabilitiesCreditedOrChargedToComprehensiveIncome 90% to 100% Ninety Percent To One Hundred Percent [Member] Loans and advances to banks Loans And Advances To Banks [Member] Fixed rate bonds Fixed Rate Bonds [Member] Designated at fair value through profit or loss £m Designated At Fair Value Through Profit Or Loss [Member] Deferred tax liabilities Net deferred tax assets and liabilities [abstract] Type of movements in allowance for impairment losses [Axis] Type Of Movements In Allowance For Impairment Losses [Axis] Deposits from banks Deposits From Banks And Repurchase Agreements Deposits From Banks And Repurchase Agreements 6.475% Non-cumulative Preference shares of GBP0.25 6.475% Non-Cumulative Preference Shares [Member] 6.475% Non-Cumulative Preference Shares Other assets Other assets [member] Administrative costs paid Administrative Expenses, Net Defined Benefit Liability (Asset) Administrative Expenses, Net Defined Benefit Liability (Asset) $1,500 million 7.5% Fixed Rate Reset Additional Tier 1 Perpetual Subordinated Contingent Convertible Securities Callable 2025 7.5% Convertible Securities Callable 2025 [Member] 7.5% Convertible Securities Callable 2025 EUR denominated senior unsecured fixed rate note maturing 2030 EUR denominated Senior Unsecured Fixed Rate Note Maturing 2030 [Member] EUR denominated Senior Unsecured Fixed Rate Note Maturing 2030 Loss contingencies by nature of contingency [Domain] Loss Contingencies By Nature Of Contingency [Domain] Loss Contingencies By Nature Of Contingency [Domain] Subordinated liabilities Subordinated Liabilities [Member] Subordinated Liabilities $1,000 million 6.625% Fixed Rate Reset Additional Tier 1 Perpetual Subordinated Contingent Convertible Securities callable 2035 6.625% Convertible Securities Callable 2035 [Member] 6.625% Convertible Securities Callable 2035 Increase in ECL Increase (decrease) in financial assets CMS 15–18 CMS 15-18 [Member] Classes of other provisions [Axis] Classes of other provisions [axis] Debt securities in issue Disclosure of debt instruments [text block] Leasehold improvements Leasehold improvements [member] Total non-cash items TotalNoncashItems Total non-cash items OTHER EQUITY INSTRUMENTS (Details) - Schedule of Other Equity Instruments [Table] OTHER EQUITY INSTRUMENTS (Details) - Schedule of Other Equity Instruments [Table] Insurance revenue Total insurance revenue Insurance revenue Change in other operating liabilities Increase Decrease In Other Operating Liabilities1 Amount of increase (decrease) in operating liabilities classified as other. Repurchases and redemptions of other equity instruments Redemption Of Other Equity Instruments Exchange [Domain] Exchange [Domain] Type of benefit recipient [Axis] Type Of Benefit Recipient [Axis] Net amount recognised in the balance sheet Net Amounts Presented In The Balance Sheet [Member] Statutory position Statutory Position [Member] Derivative financial instruments Derivative liabilities £m Derivative liabilities Derivative liabilities At 1 January, derivative liabilities At 31 December, derivative liabilities Derivative financial liabilities Net investment return on assets held to back insurance and participating investment contracts Net Investment Return on Assets Held to Back Insurance and Participating Investment Contracts Net Investment Return on Assets Held to Back Insurance and Participating Investment Contracts Disclosure of credit risk exposure [line items] Disclosure of credit risk exposure [line items] Schedule of - Retirement Benefit Charges to Income Statement, Analysis of Defined Benefit Obligation, Pooled Investment Vehicles, Assumptions Used in Valuation, Member Life Expectancy, Alternative Valuation Assumptions Used, Weighted Average Duration of Defined Benefit Obligations, Maturity Analysis of Benefits To Be Paid and Other Movements Disclosure of defined benefit plans [text block] 3 to 6 months £m Later than three months and not later than six months [member] Ordinary shares, nominal value 10 pence each Ordinary shares Ordinary shares [member] Insurance underwriting risk Disclosure of Insurance Underwriting Risk [Text Block] Disclosure of Insurance Underwriting Risk Liabilities included in disposal groups classified as held for sale Liabilities included in disposal groups classified as held for sale Earnings per share Disclosure of earnings per share [text block] Auditors’ remuneration Disclosure of auditors' remuneration [text block] Gross carrying amount Carrying value £m Gross carrying amount [member] Movements in revaluation reserve in respect of debt securities held at FVOCI: MovementsInRevaluationReserveInRespectOfDebtSecuritiesHeldAtFairValueThroughOtherComprehensiveIncome [Abstract] Covered bond program [Axis] Covered Bond Program [Axis] Applicable tax rate (in percent) Applicable tax rate Insurance revenue Insurance revenue [abstract] Other retail lending Other Retail Lending [Member] Other Retail Lending $824,033,000 5.3% Subordinated Securities due 2045 $824,033,000 5.3% Subordinated Securities due 2045 [Member] $824,033,000 5.3% Subordinated Securities due 2045 Within 1 year £m Not later than 1 year Not later than one year [member] Undiscounted future cash flow basis Undiscounted Future Cash Flow Basis [Member] Equity and venture capital investments EquityAndVentureCapitalInvestments Operating lease depreciation Operating Lease Depreciation The depreciation charge against Op lease assets in the Property, Plant and equipment note adjusted for gains on sale of leased assets. Loan commitments and financial guarantees Loan Commitments And Financial Guarantees [Member] Fee and commission income Fee and commission income Distributions on other equity instruments Distributions Of Profit (Loss), Other Equity Instruments Distributions Of Profit (Loss), Other Equity Instruments Undated £m Undated Subordinated Liabilities [Member] Financial liabilities at fair value through profit or loss Financial liabilities at fair value through profit or loss, category [member] Total fees payable to the Company’s auditors by the Group Auditors' remuneration Auditor's remuneration Property, plant and equipment £m Property, plant and equipment [member] Disclosure of financial assets [line items] Disclosure of financial assets [line items] Property, plant and equipment Description of accounting policy for property, plant and equipment [text block] Type of valuation [Domain] TypeOfValuation [Domain] Payments of lease liabilities, classified as financing activities Payments of lease liabilities, classified as financing activities 2025 % Current Reporting Year [Member] Current Reporting Year Other Other Retail Unsecured Loans, Overdrafts, Motor Finance and Other Retail [Member] Unsecured Loans, Overdrafts, Motor Finance and Other Retail Rate, Variable [Domain] Rate, Variable [Domain] Rate, Variable [Domain] Disclosure of impairment loss and reversal of impairment loss [abstract] Disclosure of impairment loss and reversal of impairment loss [abstract] Settlements Decrease (increase) in net defined benefit liability (asset) resulting from payments in respect of settlements Hedged percent of exposure to increases in life expectancy (in percent) Hedged Percent Of Defined Benefit Scheme Exposure To Increases Life Expectancy Hedged Percent Of Defined Benefit Scheme Exposure To Increases Life Expectancy Residual Value Impairment And Voluntary Terminations Residual Value Impairment And Voluntary Terminations [Member] Residual Value Impairment And Voluntary Terminations 20 year Twenty Years [Member] Twenty Years DERIVATIVE FINANCIAL INSTRUMENTS (Tables) [Table] DERIVATIVE FINANCIAL INSTRUMENTS (Tables) [Table] Weighted-average number of ordinary shares in issue – diluted (in shares) Weighted average number of ordinary shares used in calculating diluted earnings per share Retail – UK mortgages Mortgages Mortgages [member] Net gains (losses) on financial instruments held for trading Gains (losses) on financial liabilities at fair value through profit or loss, classified as held for trading Total loans and advances to customers Loans to consumers [member] Index-linked government bonds Floating interest rate [member] Repayment of subordinated liabilities Repayment of subordinated liabilities Repayments of subordinated liabilities Equity instruments Equity instruments, amount contributed to fair value of plan assets Less than 60% Less Than Sixty Percent [Member] Less Than Sixty Percent Equity Change in Equity [Member] Change in Equity Disclosure of Maturities of Assets and Liabilities Disclosure of Maturities of Assets and Liabilities [Text Block] Disclosure of Maturities of Assets and Liabilities Fair value and other accounting methods £bn Increase (Decrease) Due to Fair Value and Other Accounting Adjustments Increase (Decrease) Due to Fair Value and Other Accounting Adjustments Reclassification adjustments on financial assets measured at fair value through other comprehensive income, net of tax Reclassification Adjustments On Disposal Of Financial Assets Measured At Fair Value Through Other Comprehensive Income Reclassification Adjustments On Disposal Of Financial Assets Measured At Fair Value Through Other Comprehensive Income 6 RMS Grade 6 [Member] RMS Grade 6 Classes of intangible assets other than goodwill [domain] Classes of intangible assets other than goodwill [domain] (Gains) losses recognised in the income statement, within other income, relating to the change in fair value of those liabilities held at 31 December Gains (Losses) Recognised In Profit Or Loss Fair Value Measurement Liabilities Held At Year End Gains (Losses) Recognised In Profit Or Loss Fair Value Measurement Liabilities Held At Year End Adjustments for: AdjustmentsFor [Abstract] Classes of intangible assets and goodwill [Axis] Classes of intangible assets and goodwill [axis] Cash flow hedge reserve Cash Flow Hedging Reserve [Abstract] Cash Flow Hedging Reserve Matching shares Matching Shares [Member] RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Benefit Plan Member Life Expectancy [Line Items] RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Benefit Plan Member Life Expectancy [Line Items] Original assets before transfer Original assets before transfer Reserves within equity [domain] Reserves within equity [domain] $1,500,000,000 4.344% Subordinated Securities due in 2048 $1,500,000,000 4.344% Subordinated Securities due in 2048 [Member] $1,500,000,000 4.344% Subordinated Securities due in 2048 Current tax Current Tax Relating To Financial Assets Measured At Fair Value Through Other Comprehensive Income Included In Other Comprehensive Income, Change in Fair Value Current Tax Relating To Financial Assets Measured At Fair Value Through Other Comprehensive Income Included In Other Comprehensive Income, Change in Fair Value % of share capital Percentage Of Entity's Share Capital Percentage Of Entity's Share Capital Weighted average exercise price of share options exercisable in share-based payment arrangement (in GBP per option) Weighted average exercise price of share options exercisable in share-based payment arrangement Profit attributable to non-controlling interests Profit (loss), attributable to non-controlling interests Equity Equity [abstract] Disclosure of detailed information about financial instruments [abstract] Disclosure of detailed information about financial instruments [abstract] RMS 10 RMS 10 [Member] Actuarial assumption of life expectancy after retirement Actuarial assumption of life expectancy after retirement Methodology and model changes Methodology And Model Changes [Member] Methodology And Model Changes Weighted average exercise price, cancelled (in GBP per option) WeightedAverageExercisePriceOfShareOptionsCancelledInSharebasedPaymentArrangement Weighted average exercise price of share options cancelled in share-based payment arrangement Subclassifications of assets, liabilities and equities [abstract] Subclassifications of assets, liabilities and equities [abstract] $1,000,000,000 3.750% Senior Callable Fixed-to-Fixed Rate Notes due 2028 $1,000,000,000 3.750% Senior Callable Fixed-to-Fixed Rate Notes due 2028 [Member] $1,000,000,000 3.750% Senior Callable Fixed-to-Fixed Rate Notes due 2028 Free float percentage of listed preference shares (in percent) Free Float Percentage of Listed Preference Shares Free Float Percentage of Listed Preference Shares Decrease of 0.25% Quarter Percent Decrease [Member] Quarter Percent Decrease Non-cash and other items Total Adjustments For Non Cash And Other Items Other comprehensive income, net of tax, financial assets measured at fair value through other comprehensive income Debt securities Movements recognised in other comprehensive income Other comprehensive income, net of tax, financial assets measured at fair value through other comprehensive income Financial assets at fair value through other comprehensive income Financial assets at fair value through other comprehensive income, category [member] Market approach Market approach [member] Weighted-average rate of increase for pensions in payment (in percent) Actuarial assumption of expected rates of pension increases SEGMENTAL ANALYSIS (Details) - Schedule of Operating Segments [Table] SEGMENTAL ANALYSIS (Details) - Schedule of Operating Segments [Table] Other financial assets mandatorily held at fair value through profit or loss Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] Reverse repurchase agreements Reverse Repurchase Agreements [Member] Reverse Repurchase Agreements 1 RMS Grade 1 [Member] RMS Grade 1 Total change in profit or loss Total change in profit or loss Increase (Decrease) Through Change In Profit Or Loss, Insurance Contracts Liability (Asset) Increase (Decrease) Through Change In Profit Or Loss, Insurance Contracts Liability (Asset) Bank and building society certificates of deposit Bank And Building Society Certificates of Deposit [Member] Bank And Building Society Certificates of Deposit Other creditors and accruals Other Creditors And Accruals Other creditors and accruals Debt instruments Debt instruments held [abstract] Insurance revenue Increase (decrease) through insurance revenue, insurance contracts liability (asset) Audits of the unconsolidated Open-Ended Investment Companies managed by the Group Audits Of The Unconsolidated Open Ended Investment Companies Managed By The Group [Member] Executive Option Plans Lloyds Banking Group Executive Share Plan 2003 [Member] Auditor firm ID Auditor Firm ID Discount rates post tax Description Of Discount Rates Applied To Cash Flow Projections Post Tax Description Of Discount Rates Applied To Cash Flow Projections Post Tax Schedule of Other Equity Instruments DisclosureOfOtherEquityInstruments [Table Text Block] Transition risk Transition Risk [Member] Transition Risk Type of program [Domain] TypeOfProgram [Domain] First quarter 2026 % One Year After Reporting Year, Quarter One [Member] One Year After Reporting Year, Quarter One 2026 % One Year After Reporting Year [Member] One Year After Reporting Year Other market exposure Market Exposure [Axis] Market Exposure Profit (loss) of acquiree since acquisition date Profit (loss) of acquiree since acquisition date Insurance acquisition cash flows Increase (decrease) through insurance acquisition cash flows, insurance contracts liability (asset) Credit Card Cash Generating Unit Credit Card Cash Generating Unit [Member] Credit Card Cash Generating Unit Total financial assets (excluding derivatives) at fair value Financial Assets Excluding Derivatives [Member] Commercial banking and treasury fees Commercial Banking And Treasury Fees [Member] Other assets Disclosure of other assets [text block] Changes in estimates that result in losses and reversal of losses on onerous contracts Increase (Decrease) Through Changes In Estimates That Result In Losses And Reversal Of Losses On Onerous Contracts, Insurance Contracts Liability (Asset) Increase (Decrease) Through Changes In Estimates That Result In Losses And Reversal Of Losses On Onerous Contracts, Insurance Contracts Liability (Asset) Maximum exposure Maximum Exposure [Member] Deposits from banks Deposits from banks Derivative liabilities £m Derivative Liabilities [Member] Financial Instrument1 [Domain] Financial Instrument1 [Domain] Financial Instrument1 [Domain] Customer deposits Customer deposits Deposits from customers Unfavourable changes £m Unfavourable Changes [Member] Type of measurement of expected credit losses [domain] Type of measurement of expected credit losses [domain] Change in fair value Other comprehensive income, before tax, gains (losses) from investments in equity instruments Property, plant and equipment: Property, plant and equipment including right-of-use assets Net position Level 3 financial liabilities carried at fair value Level 3 financial liabilities carried at fair value Financial liabilities, at fair value SHARE-BASED PAYMENTS (Details) - Schedule of Share Options Outstanding [Line Items] SHARE-BASED PAYMENTS (Details) - Schedule of Share Options Outstanding [Line Items] Non-current assets or disposal groups classified as held for sale Non-current assets or disposal groups classified as held for sale 1 to 5 years £m Later than one year and not later than five years [member] Continuing operations, unless line item indicates otherwise [member] Continuing operations, unless line item indicates otherwise [member] Key sources of estimation uncertainty Source of Estimation Uncertainty [Axis] Source of Estimation Uncertainty Top of range Top of range [member] Deferred tax asset duration [Domain] DeferredTaxAssetDuration [Domain] Scenario [Axis] Scenario [Axis] Disclosure of other liabilities [text block] [Abstract] Disclosure of other liabilities [Abstract] Share based payment arrangement, vesting rate Share Based Payment Arrangement, Vesting Rate Share Based Payment Arrangement, Vesting Rate Consumer lending Retail Segment - Consumer Lending [Member] Retail Segment - Consumer Lending Tax losses where no deferred tax recognised Tax effect of tax losses Schedule of Amount, Timing and Uncertainty of Future Cash Flows Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [text block] Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans Post-retirement defined benefit scheme remeasurements, net of tax Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans Increase/(decrease) n probability-weighted expected credit loss Increase/(Decrease) In Probability-Weighted Expected Credit Loss Increase/(Decrease) In Probability-Weighted Expected Credit Loss $1,175,176,000 3.369% Subordinated Notes due 2046 $1,175,176,000 3.369% Subordinated Notes due 2046 [Member] $1,175,176,000 3.369% Subordinated Notes due 2046 4 RMS Grade 4 [Member] RMS Grade 4 Other comprehensive income that will not be reclassified to profit or loss, before tax Other comprehensive income that will not be reclassified to profit or loss, net of tax $300,000,000 Senior Callable Floating Rate Notes due 2028 $300,000,000 Senior Callable Floating Rate Notes due 2028 [Member] $300,000,000 Senior Callable Floating Rate Notes due 2028 Other accounting estimates Accounting estimates [axis] Retail – UK unsecured loans and overdrafts Unsecured Loans And Overdrafts [Member] Unsecured Loans And Overdrafts Non-taxable income Tax effect of revenues exempt from taxation Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [Axis] Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] DEBT SECURITIES IN ISSUE (Details) - Schedule of Debt Securities in Issue [Line Items] DEBT SECURITIES IN ISSUE (Details) - Schedule of Debt Securities in Issue [Line Items] DEBT SECURITIES IN ISSUE (Details) - Schedule of Debt Securities in Issue [Line Items] Investment property gains (losses) Change in fair value Revaluation of investment properties Gains (losses) on fair value adjustment, investment property Government securities Government debt instruments held OPERATING EXPENSES (Details) - Schedule of Average Number of Persons Employed by the Group [Table] OPERATING EXPENSES (Details) - Schedule of Average Number of Persons Employed by the Group [Table] Defined benefit obligation Defined benefit obligation, at present value Impairment Charge (credit) to the income statement Underlying impairment (charge) credit Allowance for loan losses Impairment loss (reversal of impairment loss) recognised in profit or loss DEFERRED TAX (Details) - Schedule of Statutory Position and Tax Disclosure [Table] DEFERRED TAX (Details) - 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$1,250,000,000 4.55% Senior Notes due 2028 [Member] $1,250,000,000 4.55% Senior Notes due 2028 AUDITORS' REMUNERATION (Details) - Schedule of Fees Payable to Auditors by Outside Entities [Table] AUDITORS' REMUNERATION (Details) - Schedule of Fees Payable to Auditors by Outside Entities [Table] Fixed rate issuance Fixed Rate Issuance [Member] Schedule of Valuation Hierarchy for Financial Liabilities Disclosure of fair value measurement of liabilities [text block] 4.50% Fixed Rate Step-up Subordinated Notes 2030 (€441 million) 4.50% Fixed Rate Step-up Subordinated Notes 2030 441 million [Member] 4.50% Fixed Rate Step-up Subordinated Notes 2030 441 million $1,000,000,000 1.627% Senior Notes due 2027 $1,000,000,000 1.627% Senior Notes due 2027 [Member] $1,000,000,000 1.627% Senior Notes due 2027 Gender [Axis] Gender [Axis] Asset-liability matching strategy, liability sensitivity to inflation movements (in percent) Asset-Liability Matching Strategy, Liability Sensitivity To Inflation 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Non-life Insurance contracts to which premium allocation approach has been applied [member] Contingent liabilities, commitments and guarantees Disclosure of commitments and contingent liabilities [text block] Schedule of Property, Plant and Equipment Disclosure of detailed information about property, plant and equipment [text block] Other reserves Disclosure of reserves within equity [text block] Borrowings, interest rate (in percent) Borrowings, interest rate Net cash used in investing activities Cash flows from (used in) investing activities 13 RMS Grade 13 [Member] RMS Grade 13 Derivative financial instruments Disclosure of derivative financial instruments [text block] Type of dividend [Axis] Type Of Dividend [Axis] Capital risk Disclosure of objectives, policies and processes for managing capital [text block] Interest rate spreads Interest Rate Spreads [Member] Interest Rate Spreads Loans and advances to banks and reverse repurchase agreements with banks Loans And Advances To Banks 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$1,250,000,000 5.871% Senior Callable Fixed-To-Fixed Rate Notes due 2029 Debt securities in issue Debt Instruments Issued At Amortised Cost [Member] Debt Instruments Issued At Amortised Cost Financial assets at amortised cost Impairment Loss (Reversal) Recognised In Other Comprehensive Income Impairment Loss (Reversal) Recognised In Other Comprehensive Income Interest rate on deposits (percent) Interest Rate On Deposits 7.625% Dated Subordinated Notes 2025 (£273 million) 7.625% Dated Subordinated Notes 2025 [Member] 7.625% Dated Subordinated Notes 2025 Share capital Description of accounting policy for issued capital [text block] Price index [Domain] PriceIndex [Domain] Business and Commercial Banking Commercial Banking - Business and Commercial Banking [Member] Commercial Banking - Business and Commercial Banking $1,750,000,000 3.574% Senior Notes due in 2028 (callable in 2027) $1,750,000,000 3.574% Senior Notes due in 2028 (callable in 2027 [Member] $1,750,000,000 3.574% Senior Notes 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