Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Trading Arrangement: Trading Arrangement [Axis] Maximum Maximum [Member] Statistical Measurement [Domain] Statistical Measurement [Domain] Title of 12(b) Security Title of 12(b) Security Subsequent event Subsequent Event [Member] Document Fiscal Year Focus Document Fiscal Year Focus Revenue, remaining performance obligation, period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Merger and strategic initiatives Merger and strategic initiatives expense Business Combination, Acquisition-Related Cost, Expense Adjustment to Compensation, Amount Adjustment to Compensation Amount Total purchase price (in millions) Treasury Stock, Value, Acquired, Par Value Method Financial Instrument [Axis] Financial Instrument [Axis] Number of financial institution Number Of Financial Institution Number Of Financial Institution Number of Awards Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Segment Reporting [Abstract] Number of exchange traded products licensed to Nasdaq's Indexes (in exchange traded products) Number Of Exchange Traded Products Licensed Number Of ETPs Licensed Short-term debt: Changes In Short-Term Debt Obligations [Abstract] Changes In Short-Term Debt Obligations Schedule of Estimated Future Amortization Expense Intangible Asset, Finite-Lived, and Capitalized Cost, Software to be Sold, Leased, or Marketed, Estimated Amortization Expense [Table Text Block] Restructuring Plan [Axis] Restructuring Plan [Axis] 2027 Lessee, Operating Lease, Liability, to be Paid, Year One Schedule of Restricted Stock Activity Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] Payments related to employee shares withheld for taxes Payment, Tax Withholding, Share-Based Payment Arrangement Accrued personnel costs Employee-related Liabilities, Current Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Reverse purchase agreements, maturity range Reverse Purchase Agreements, Maturity Date Range Reverse Purchase Agreements, Maturity Date Range Retirement Plans Retirement Benefits [Text Block] Issuance of commercial paper, net Proceeds from (Repayments of) Commercial Paper Line of Credit Line of Credit [Member] Restatement Determination Date Restatement Determination Date Derivative Instrument [Axis] Derivative Instrument [Axis] Liability Waterfall Liability Waterfall [Member] Liability Waterfall [Member] Share-based compensation (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Measurement Frequency [Axis] Measurement Frequency [Axis] Allowance for doubtful accounts Accounts Receivable, Allowance for Credit Loss Amendment Flag Amendment Flag Goodwill [Line Items] Goodwill [Line Items] Current liabilities: Liabilities, Current [Abstract] Common Stock, $0.01 par value per share Common Stock, $.01 Par Value Per Share, The Nasdaq Stock Market [Member] Common Stock, $.01 Par Value Per Share, The Nasdaq Stock Market Average price paid per share (in dollars per share) Shares Acquired, Average Cost Per Share U.S. Senior Unsecured Notes U.S. Senior Unsecured Notes [Member] U.S. Senior Unsecured Notes 2029 Notes One Point Seven Five Senior Unsecured Notes Due 2029 [Member] One Point Seven Five Senior Unsecured Notes Due 2029 [Member] 2026 Revolving Credit Facility 2026 Revolving Credit Facility [Member] 2026 Revolving Credit Facility Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Technology Developed Technology Rights [Member] Other issuances of common stock, net (in shares) Stock Issued During Period, Shares, Other Leases [Abstract] Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Proceeds from default funds and margin deposits Proceeds From Default Funds And Margin Deposits Proceeds from sales and redemptions of securities in the default funds and margin deposits 2022 Revolving Credit Facility 2022 Revolving Credit Facility [Member] 2022 Revolving Credit Facility Revenue Recognized Contract with Customer, Liability, Revenue Recognized Including Opening Balance Contract with Customer, Liability, Revenue Recognized Including Opening Balance Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Transaction rebates Transaction Rebates [Member] Transaction Rebates [Member] January Accelerated Share Repurchase Agreement Program Jan2026 Accelerated Share Repurchase Agreement Program [Member] Jan2026 Accelerated Share Repurchase Agreement Program Entity Address, State or Province Entity Address, State or Province Licenses Licensing Agreements [Member] Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross PEO Total Compensation Amount PEO Total Compensation Amount Foreign currency translation, net Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Assets, Fair Value Disclosure [Abstract] Assets, Fair Value Disclosure [Abstract] Purchases of property and equipment Segment Reporting, Long-Lived Asset, Expenditure for Addition Intangible assets, net Total intangible assets, net Intangible Asset, Excluding Goodwill, after Accumulated Amortization Unvested balances at beginning of period (in shares) Unvested balances at end of period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Weighted-average common shares outstanding for basic earnings per share (in shares) Weighted Average Number of Shares Outstanding, Basic Share Repurchase Program [Domain] Share Repurchase Program [Domain] First Anniversary Share-Based Payment Arrangement, Tranche One [Member] Legal and regulatory matters Legal And Regulatory Matters Legal and regulatory matters expense includes accruals related to certain legal matters as well as other legal expenses. Retirement Benefits [Abstract] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Number of reportable segments (in segments) Number of Reportable Segments Total current liabilities Liabilities, Current 2030 Lessee, Operating Lease, Liability, to be Paid, Year Four Aggregate principal amount purchased plus accrued and unpaid interest Aggregate Principal Amount Purchased Plus Accrued And Unpaid Interest Aggregate Principal Amount Purchased Plus Accrued And Unpaid Interest Customer Relationships Customer relationships Customer Relationships [Member] Schedule of Clearing Member Default Fund Contributions Schedule Of Default Fund Contributions Table [Table Text Block] Schedule Of Default Fund Contributions Table Schedule of Derivative Contracts Outstanding Schedule of Derivative Instruments [Table Text Block] Foreign currency translation adjustment Foreign currency translation adjustment Foreign Currency Translation Adjustment [Member] Foreign currency translation adjustment [Member] 2032 Notes Four Point Five Senior Unsecured Notes Due 2032 [Member] Four Point Five Senior Unsecured Notes Due 2032 Subsequent Events Subsequent Events, Policy [Policy Text Block] Entity Address, City or Town Entity Address, City or Town Total number of listings on The Nasdaq Stock Market (in companies) Total Number Of Listed Companies Total Number Of Companies Listed On The Nasdaq Stock Market. Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Additional units granted above target (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Grants in Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Grants in Period Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Statement of Financial Position [Abstract] Title of Individual [Domain] Title and Position [Domain] Workflow & Insights Workflow & Insights [Member] Workflows & Insight [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Class of Stock [Axis] Class of Stock [Axis] Finite-lived intangible assets, net Net Amount Intangible Asset, Finite-Lived, after Accumulated Amortization Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Stock options, futures and forwards Stock Options And Futures [Member] Stock Options And Futures [Member]. Minimum payout (as a percent) Share Based Compensation Arrangement By Share Based Payment Award Percentage Of Shares Earned 1 Share Based Compensation Arrangement By Share Based Payment Award Percentage Of Shares Earned 1 Proceeds from issuance of stock under employee stock plans Proceeds from Stock Plans Sublease income Sublease Income Level 2 Level 2 Fair Value, Inputs, Level 2 [Member] Accumulated Amortization Intangible Asset, Finite-Lived, Accumulated Amortization Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Credit facility, borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Total other comprehensive income (loss), net of tax Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] 0.900% Senior Notes due 2033 2033 Notes Zero Point Nine Zero Zero Senior Unsecured Notes Due 2033 [Member] Zero Point Nine Zero Zero Senior Unsecured Notes Due 2033 Payment for default funds and margin deposits Payment For Default Funds And Margin Deposits Payment For Default Funds And Margin Deposits Clearing Operations [Line Items] Clearing Operations [Line Items] Clearing Operations [Line Items] Other Other Restructuring [Member] Other expenses Other Expenses United States UNITED STATES Subsequent Event Type [Axis] Subsequent Event Type [Axis] Unrealized gain (loss) on derivatives instruments, net Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Accounting Pronouncements Not Yet Adopted New Accounting Pronouncements, Policy [Policy Text Block] Deferred revenue Increase (Decrease) in Contract with Customer, Liability Schedule of Operating Segments Segment Reporting [Table Text Block] Noncontrolling interests Noncontrolling Interest [Member] Officer Officer [Member] Accounting Estimates Use of Estimates, Policy [Policy Text Block] 2050 Notes Three Point Two Five Senior Unsecured Notes Due 2050 [Member] Three Point Two Five Senior Unsecured Notes Due 2050 Total long-term debt Long-Term Debt Schedule of Operating Lease Liabilities Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Document Period End Date Document Period End Date Net change in operating assets and liabilities, excluding the effects of divestitures: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Net cash provided by (used in) investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding 2063 Notes Six Point One Senior Unsecured Notes Due 2063 [Member] Six Point One Senior Unsecured Notes Due 2063 2028 Lessee, Operating Lease, Liability, to be Paid, Year Two Basic and diluted earnings per share: Earnings Per Share, Basic [Abstract] Nasdaq Stockholders' Equity Equity [Text Block] Total program costs incurred Restructuring and Related Cost, Cost Incurred to Date Assets management value Assets Under Management Assets Under Management linked to Nasdaq indices Security Exchange Name Security Exchange Name Credit facility term Debt Instrument, Term Schedule of Corporate Items Segment Reporting, Reconciliation of Other Item by Segment to Consolidated [Table Text Block] Common stock in treasury, at cost: 25,528,300 shares at June 30, 2026 and 24,726,296 shares at December 31, 2025 Treasury Stock, Common, Value Maximum interest rate on debt instrument Debt Instrument, Interest Rate, Effective Percentage Section 31 fees payable to SEC Increase (Decrease) In Section 31 Fees Payable Increase (Decrease) In Section 31 Fees Payable Stockholders' Equity [Table] Stockholders Equity [Table] Stockholders' Equity [Table] Impairment of equity method investment Equity Method Investment, Other-than-Temporary Impairment Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Consolidation Items [Domain] Consolidation Items [Domain] Current lease liabilities Current lease liabilities Operating Lease, Liability, Current Net activity related to noncontrolling interests Stockholders' Equity, Period Increase (Decrease) Statement of Comprehensive Income [Abstract] Reverse repurchase agreements Repurchase Agreements [Member] Earnings Per Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Per share information: Earnings Per Share [Abstract] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Document Fiscal Period Focus (i.e. Q1,Q2,Q3,FY) Document Fiscal Period Focus Default funds and margin deposits Increase (Decrease) In Default Fund Contributions And Margin Deposits Increase (Decrease) In Default Fund Contributions And Margin Deposits Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Trading securities Debt Securities, Trading, and Equity Securities, FV-NI Total liabilities Liabilities Trading Symbol Trading Symbol Geographical [Domain] Geographical [Domain] Total indefinite-lived intangible assets Intangible Asset, Excluding Goodwill, Indefinite-Lived Index Index [Member] Index [Member] Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Discount given to employees (as a percent) Rate Of Discount Given To Employees Rate of Discount given to Employees. Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Employer contribution match, percentage of employee contribution Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Company Selected Measure Name Company Selected Measure Name Income Tax Disclosure [Abstract] Weighted-average effect of dilutive securities: Weighted Average Number of Shares Outstanding, Diluted, Adjustment [Abstract] Schedule of Indefinite-Lived Intangible Assets [Table] Intangible Asset, Indefinite-Lived [Table] Proceeds from divestitures, net of cash divested Proceeds from Divestiture of Businesses, Net of Cash Divested Long-term debt obligations at beginning of period Long-term debt obligations at end of period Long-Term Debt, Gross Line of credit facility, commitment fee percentage Line of Credit Facility, Commitment Fee Percentage Credit Facility [Domain] Credit Facility [Domain] Depreciation and amortization Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Cash flows from operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Investments, Debt, and Equity Securities [Table] Investments, Debt, and Equity Securities [Table] Investments, Debt, and Equity Securities [Table] Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Weighted-average common shares outstanding for diluted earnings per share (in shares) Weighted Average Number of Shares Outstanding, Diluted Schedule of Debt [Line Items] Schedule of Debt [Line Items] Schedule of Debt [Line Items] Indefinite-lived Intangible Assets [Line Items] Intangible Asset, Indefinite-Lived [Line Items] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Common stock (in votes per share) Stockholders' Equity, Number Of Votes Stockholders' Equity, Number Of Votes Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Divestitures of businesses Revenue From Divested Businesses Revenue From Divested Businesses Commercial paper Commercial Paper [Member] Entities [Table] Entities [Table] Expected net expense synergies Restructuring, Benefits Achieved, Expected Net Expense Synergies Restructuring, Benefits Achieved, Expected Net Expense Synergies Less: interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Vesting percentage (as a percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage Commodity futures and forwards Commodity Forwards And Options [Member] Commodity Forwards And Options [Member]. Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Short-term debt - beginning balance Short-term debt - ending balance Short-term debt Short-Term Debt Clearing Operations Due to and from Broker-Dealers and Clearing Organizations Disclosure [Text Block] Revenues less transaction-based expenses Revenues less transaction-based expenses Gross Profit Revenue from Contract with Customer [Abstract] Additions Current Period Additions Of Long-Term And Short-Term Debt Current Period Additions Of Long-Term And Short-Term Debt Total Nasdaq stockholders’ equity Total Equity [Member] Total Equity Discount from market price (as a percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Discount from Market Price, Purchase Date Cash paid for amounts included in the measurement of operating lease liabilities Operating Lease, Payments Transaction-based expenses: Cost of Revenue [Abstract] Award Timing Predetermined Award Timing Predetermined [Flag] Common stock in treasury, at cost Treasury Stock, Common [Member] Intangible Asset, Goodwill and Other [Abstract] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Initial Listings Initial Listings Initial Listings Fees [Member] Initial Listings Fees [Member] Level 1 Fair Value, Inputs, Level 1 [Member] Denominator: Denominator [Abstract] Denominator [Abstract] Effective tax rate Effective Income Tax Rate Reconciliation, Percent Organization, Consolidation and Presentation of Financial Statements [Abstract] Indefinite-lived Intangible Assets, Major Class Name [Domain] Intangible Asset, Indefinite-Lived, Class [Domain] Total lease payments Lessee, Operating Lease, Liability, to be Paid Debt Securities [Abstract] Debt Securities [Abstract] Employee equity awards (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Unvested balances at beginning of period (in dollars per share) Unvested balances at end of period (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Schedule of Estimated Deferred Revenue Estimated Deferred Revenue [Table Text Block] The year in which deferred revenue is expected to be recognized. All Executive Categories All Executive Categories [Member] Revenues: Regulated Operating Revenue [Abstract] Employer contribution match, percent match Defined Contribution Plan, Employer Matching Contribution, Percent of Match Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Numerator: Numerator [Abstract] Numerator [Abstract] Preferred stock par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Fair value of debt utilizing discounted cash flow analyses Long-Term Debt, Fair Value Plan Name [Domain] Plan Name [Domain] Vesting [Domain] Vesting [Domain] Weighted average exercise price, outstanding, beginning balance (in dollars per share) Weighted average exercise price, outstanding, ending balance (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price 2030 Contract With Customer, Liability, Expected To Be Recognized In Year Four Contract With Customer, Liability, Expected To Be Recognized In Year Four Reconciliation of Cash, Cash Equivalents and Restricted Cash and Cash Equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation [Abstract] Operating lease assets Operating lease assets Operating Lease, Right-of-Use Asset February Accelerated Share Repurchase Agreement Program Feb 2026 Accelerated Share Repurchase Agreement Program [Member] Feb 2026 Accelerated Share Repurchase Agreement Program Schedule of Computation of Basic and Diluted Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Fair Value Disclosures [Abstract] Debt Disclosure [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Share repurchase program Treasury Stock, Retired, Par Value Method, Amount Junior capital, cash deposits and pledged assets Junior Capital Cash Deposits And Pledged Assets Junior capital, cash deposits and pledged assets. Business Segments Segment Reporting [Text Block] Investments Investment in Debt and Equity Securities and Other Trading Assets [Text Block] Other issuances of common stock, net Stock Issued During Period, Value, Other Utilized amount Long-Term Line of Credit Minimum Minimum [Member] Expiration Date Trading Arrangement Expiration Date Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Liabilities Liabilities: Liabilities [Abstract] Total volume in cleared power, in Terawatt hours (TWh) Total Volume In Cleared Power Total volume in cleared power. Schedule of Finite-lived Intangible Assets Amortization Expense Intangible Asset, Finite-Lived, Amortization Expense [Table Text Block] Effect of exchange rate changes on cash and cash equivalents and restricted cash and cash equivalents Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Default funds and margin deposits Default Funds And Margin Deposits Liabilities Nasdaq Clearing members cash contributions for regulatory capital requirements associated with default fund contributions and margin deposits. Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Foreign Currency Translation Contract With Customer, Liability, Revenue Translation Adjustment Contract With Customer, Liability, Revenue Translation Adjustment Total equity Beginning balance Ending balance Equity, Including Portion Attributable to Noncontrolling Interest Weighted-average remaining contractual term, Outstanding (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted-Average Remaining Contractual Term Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Retirement Plans expense Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] At or Above Manager Level At or Above Manager Level [Member] At or Above Manager Level Expenses - divestitures Disposal Group, Including Discontinued Operation, Operating Expense Common stock, shares authorized (in shares) Common Stock, Shares Authorized 2040 Notes Two Point Five Zero Zero Senior Unsecured Notes Due 2040 [Member] Two Point Five Zero Zero Senior Unsecured Notes Due 2040 Market Services Market Services Market Services [Member] Market Services Exercise Price Award Exercise Price Schedule of Restructuring and Related Costs [Table] Restructuring Cost [Table] Cash flows from investing activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Share-based compensation Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Fair value, recurring Fair Value, Recurring [Member] Segment Reporting [Line Items] Segment Reporting [Line Items] Total unrecognized compensation cost Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Document Quarterly Report Document Quarterly Report Weighted-average grant date share price (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Per Share Weighted Average Price of Shares Purchased Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Segments [Domain] Segments [Domain] Europe Europe [Member] Clearinghouse Credit Facilities Clearinghouse Credit Facilities [Member] Clearinghouse Credit Facilities [Member] Capital Markets Technology Capital Markets Technology [Member] Capital Markets Technology Debt Obligations Debt Disclosure [Text Block] Repayments of debt and credit commitment Repayments of Long-Term Debt Unamortized debt issuance costs Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Schedule of Restructuring Charges Restructuring and Related Costs [Table Text Block] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Equity method investments Equity Method Investments Equity Component [Domain] Equity Component [Domain] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Directly consumed expenses Total expenses Costs and Expenses Adoption Date Trading Arrangement Adoption Date Cash dividends declared and paid Dividends declared Total Amount Paid Dividends, Common Stock, Cash Total Nasdaq stockholders’ equity Equity, Attributable to Parent Restructuring Type [Axis] Restructuring Type [Axis] Assets Assets: Assets [Abstract] Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Changes In Debt Obligations [Abstract] Changes In Debt Obligations [Abstract] Changes In Debt Obligations Accounting Policies [Abstract] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Weighted-average risk-free interest rate Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Total lease liabilities Operating Lease, Liability Additions Contract With Customer, Liability, Current Period Additions, Net of Recognition Contract With Customer, Liability, Current Period Additions, Net of Recognition Fair value, nonrecurring Fair Value, Nonrecurring [Member] Professional and contract services Professional Fees Insider Trading Policies and Procedures [Line Items] Stock options outstanding beginning balance (in shares) Stock options outstanding ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Change in Contract with Customer Liability [Roll Forward] Change In Contract With Customer Liability [Roll Forward] Change In Contract With Customer Liability [Roll Forward] Other financing activities Proceeds from (Payment for) Other Financing Activity Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] PSUs Performance Shares [Member] Number of countries services are provided (in countries) Services Provided Over Number Of Countries Services Provided Over Number Of Countries Deferred income tax expense Deferred Income Tax Expense (Benefit) Financial Technology Financial Technology Financial Technology [Member] Financial Technology Type of Restructuring [Domain] Type of Restructuring [Domain] Long-term debt - senior unsecured notes: Changes in Long-Term Debt Obligations [Abstract] Changes in Long-Term Debt Obligations Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Accelerated Share Repurchases, Date [Axis] Accelerated Share Repurchases, Date [Axis] Securities excluded from the computation of diluted earnings per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Number of operating segments (in segments) Number of Operating Segments Schedule of Changes in Goodwill Goodwill [Table Text Block] Entity Central Index Key Entity Central Index Key Common stock, $0.01 par value, 900,000,000 shares authorized, shares issued: 587,518,685 at June 30, 2026 and 594,620,320 at December 31, 2025; shares outstanding: 561,990,385 at June 30, 2026 and 569,894,024 at December 31, 2025 Common Stock, Value, Outstanding All Adjustments to Compensation All Adjustments to Compensation [Member] Corporate Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Committed capital Committed Capital Committed Capital - Nasdaq Clearing Article 16 Capital Regulatory Technology Regulatory Technology Regulatory Technology [Member] Regulatory Technology [Member] Equity [Abstract] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Organization And Basis Of Presentation [Table] Organization And Basis Of Presentation [Table] Organization And Basis Of Presentation [Table] Employee shares withheld Stockholders' Equity, Other Fixed-income swaps, futures and forwards Fixed Income Options And Futures [Member] Fixed-Income Options And Futures [Member]. Income Statement [Abstract] Nasdaq stockholders’ equity: Equity, Attributable to Parent [Abstract] Issuance of stock under employee stock plans (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Document Transition Report Document Transition Report Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Investment, Name [Axis] Investment, Name [Axis] Restructuring Plan [Domain] Restructuring Plan [Domain] Operating expenses: Expenses: Operating Expenses [Abstract] 4.500% Senior Notes due 2032 Four Point Five Zero Zero Senior Notes Due 2032 [Member] Four Point Five Zero Zero Senior Notes Due 2032 Other repurchases of common stock Other Repurchases Of Common Stock [Member] Other Repurchases of Common Stock [Member] Schedule of Income Tax Provision and Effective Tax Rate Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Data & Listing Services Data & Listing Services [Member] Data & Listing Services [Member] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Schedule of Valuation Assumptions Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule of Revenue and Property and Equipment, By Geographic Area Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table Text Block] Jeremy Skule [Member] Jeremy Skule Number of Stock Options Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] City Area Code City Area Code Customer Relationships And Licenses Customer Relationships And Licenses [Member] Customer Relationships And Licenses Restricted stock Restricted Stock [Member] Accumulated other comprehensive loss AOCI Attributable to Parent [Member] All Individuals All Individuals [Member] Dividends paid Payments of Dividends Name Forgone Recovery, Individual Name Weighted-average period unrecognized compensation cost is expected to be recognized, in years Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Weighted-Average Grant Date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Annual Listings Annual Listings Annual Renewal Fees [Member] Annual Renewal Fees And Other [Member] Statement [Line Items] Statement [Line Items] Total assets Assets Entity [Domain] Entity [Domain] Section 31 fees payable to SEC Section Thirty One Fees Payable Section Thirty One Fees Payable Financial Crime Management Technology Financial Crime Management Technology [Member] Financial Crime Management Technology Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Common stock shares reserved for future issuance (in shares) Common Stock, Capital Shares Reserved for Future Issuance Operating segments Operating Segments [Member] European government debt securities European government debt securities European Government Debt Securities [Member] European Government Debt Securities [Member] Weighted-average fair value at grant date (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Interest expense Interest Expense, Nonoperating Equity securities Equity Securities without Readily Determinable Fair Value, Amount Share-Based Compensation Share-Based Payment Arrangement [Text Block] Issuance of stock under employee stock plans Stock Issued During Period, Value, Employee Stock Purchase Plan Other assets Increase (Decrease) in Other Operating Assets Organization and Nature of Operations Nature of Operations [Text Block] Occupancy Occupancy, Net PEO PEO [Member] Total debt obligations at beginning of period Total debt obligations at ending of period Debt, Long-Term and Short-Term, Combined Amount Share-based compensation expense before income taxes Share-Based Payment Arrangement, Expense Total number of derivative contracts cleared (in contracts) Total Number Of Derivative Contracts Cleared Total number of derivative contracts cleared Committed capital Marketable Securities, Current Share repurchase program (in shares) Number of shares of common stock repurchased (in shares) Stock Repurchased and Retired During Period, Shares Other non-current liabilities Other Liabilities, Noncurrent Goodwill Balance at beginning of period Balance at end of period Goodwill Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Stock option exercises, net (in shares) Stock option exercised (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Granted (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value 2029 Contract With Customer, Liability, Expected To Be Recognized In Year Three Contract With Customer, Liability, Expected To Be Recognized In Year Three Gains and losses from equity securities Equity Securities, FV-NI, Gain (Loss) Subsequent Event Type [Domain] Subsequent Event Type [Domain] Number of equity exchanges (in exchanges) Number Of Equity Exchanges Number Of Equity Exchanges Retained earnings Retained Earnings [Member] Operating lease liabilities Non-current lease liabilities Operating Lease, Liability, Noncurrent Total operating expenses Operating Expenses Default fund contributions Default Fund Contributions Default fund Contributions. Revolving credit facility Revolving Credit Facility [Member] Forfeited (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Common stock, shares outstanding (in shares) Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Diluted earnings per share (in dollars per share) Earnings Per Share, Diluted Entity Current Reporting Status Entity Current Reporting Status Restricted cash and cash equivalents Restricted Cash And Cash Equivalents [Member] Restricted Cash And Cash Equivalents Net cash used in financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Accrued personnel costs Increase (Decrease) in Employee Related Liabilities Amortization expense Amortization expense of acquired intangible assets Intangible Asset, Finite-Lived, Amortization Expense Intangible Asset, Finite-Lived [Line Items] Intangible Asset, Finite-Lived [Line Items] Investments related to default funds and margin deposits, net Payments For (Proceeds From) Default Funds And Margin Deposits Payments For (Proceeds From) Default Funds And Margin Deposits Adjustments to reconcile net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Trade names and other Trade Names And Other Intangible Assets [Member] Trade Names And Other Intangible Assets Commitments, Contingencies and Guarantees Commitments Contingencies and Guarantees [Text Block] 2031 Notes One Point Six Five Zero Senior Unsecured Notes Due 2031 [Member] One Point Six Five Zero Senior Unsecured Notes Due 2031 Default funds and margin deposits (including restricted cash and cash equivalents of $254 and $3,120, respectively) Default funds and margin deposits assets Default Funds And Margin Deposits Assets Nasdaq Clearing members cash contributions for regulatory capital requirements associated with default fund contributions and margin deposits. Share-Based Payment Arrangement [Abstract] Cash flows from financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Total revenues Revenue from Contract with Customer, Excluding Assessed Tax Brokerage, clearance and exchange fees Brokerage, Clearance And Exchange Fees [Member] Brokerage, Clearance And Exchange Fees [Member] Property and equipment, net Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization 2027 Contract With Customer, Liability, Expected To Be Recognized In Year One Contract With Customer, Liability, Expected To Be Recognized In Year One Remaining amount available Line of Credit Facility, Remaining Borrowing Capacity Other revenues Service, Other [Member] Stockholders Equity [Line Items] Stockholders Equity [Line Items] Stockholders Equity [Line Items] Financial Instruments [Domain] Financial Instruments [Domain] Contract value of resale and repurchase agreements Contract Value Of Resale And Repurchase Agreements Contract value of resale and repurchase agreements. Index options, futures and forwards Index Options And Futures [Member] Index Options And Futures [Member]. Intangible Asset, Finite-Lived, Class [Axis] Intangible Asset, Finite-Lived, Class [Axis] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Goodwill and Acquired Intangible Assets Intangible Asset and Goodwill [Text Block] Underlying Securities Award Underlying Securities Amount Purchases of securities Payments to Acquire Short-Term Investments Comprehensive loss attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Revenue from Contracts with Customers Deferred Revenue Revenue from Contract with Customer [Text Block] Subsegments [Domain] Subsegments [Domain] OCC Options Clearing Corporation [Member] Options Clearing Corporation [Member] 2031+ Contract With Customer, Liability, Expected To Be Recognized After Year Four Contract With Customer, Liability, Expected To Be Recognized After Year Four Two-year PSU Two-year PSU [Member] Two-year PSU Subsegments [Axis] Subsegments [Axis] Other investing activities Payment for (Proceeds from) Other Investing Activity Weighted-average discount rate Operating Lease, Weighted Average Discount Rate, Percent Number of peer groups (in peer groups) Number Of Peer Groups Number of peer groups. Increase (decrease) in denominated notes Debt Instrument, Increase (Decrease) Due To Foreign Exchange Debt Instrument, Increase (Decrease) Due To Foreign Exchange Segment Reporting [Table] Segment Reporting [Table] 2028 Notes Five Point Three Five Senior Unsecured Notes Due 2028 [Member] Five Point Three Five Senior Unsecured Notes Due 2028 Financial guarantees obtained Financial Guarantees Obtained To Provide Further Liquidity And Default Protection Related To Clearing Businesses Financial Guarantees Obtained To Provide Further Liquidity And Default Protection Related To Clearing Businesses Title of Individual [Axis] Title and Position [Axis] Schedule of Lease Cost, Lease Term and Discount Rate Lease, Cost [Table Text Block] Other current assets Other Assets, Current Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Operating income Operating income Operating loss Operating Income (Loss) Schedule of Dividends Declared Dividends Declared [Table Text Block] Revenue, remaining performance obligation Revenue, Remaining Performance Obligation, Amount Current Fiscal Year End Date Current Fiscal Year End Date Senior capital, cash deposits and pledged assets Senior Capital Cash Deposits And Pledged Assets Senior capital, cash deposits and pledged assets. Net gain on divestitures Net gain on divestitures Gain (Loss) on Disposition of Business Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Technology and communication infrastructure Communications and Information Technology Legally binding minimum lease payments Unrecorded Unconditional Purchase Obligation Foreign government debt securities Debt Security, Government, Non-US [Member] Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Cash dividends declared per common share (in dollars per share) Dividend per common share (in dollars per share) Common Stock, Dividends, Per Share, Declared Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] 2026 Revolving Credit Facility One Point Two-Five Billion, Five-Year Revolving Credit Facility [Member] One Billion, Five-Year Revolving Credit Facility [Member] Schedule of Stock Option Activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Weighted-Average Exercise Price Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Common stock, shares issued (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] Common stock holder voting rights, maximum percentage of the then-outstanding shares of Nasdaq common stock Common Stock Holder Voting Rights Common Stock Holder Voting Rights Entity Information [Line Items] Entity Information [Line Items] 2052 Notes Three Point Nine Five Zero Senior Unsecured Notes Due 2052 [Member] Three Point Nine Five Zero Senior Unsecured Notes Due 2052 [Member] Common stock in treasury (in shares) Common stock in treasury (in shares) Treasury Stock, Common, Shares Schedule of Acquired Finite-Lived Intangible Assets Intangible Asset, Finite-Lived, Acquired [Table Text Block] Equity Components [Axis] Equity Components [Axis] Product and Service [Domain] Product and Service [Domain] Income taxes paid, net of refunds Income Tax Paid, after Refund Received Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Entity Interactive Data Current Entity Interactive Data Current Maximum percentage of shares purchased from annual compensation Maximum Percentage Of Shares Purchased From Annual Compensation Maximum Percentage of Shares Purchased from Annual Compensation. Net loss attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Deferred tax liabilities, net Deferred Income Tax Liabilities, Net Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Accounts payable and accrued expenses Accounts Payable and Accrued Liabilities, Current Savings Plan expense Defined Contribution Plan, Cost Entity Small Business Entity Small Business Comprehensive income attributable to Nasdaq Comprehensive Income (Loss), Net of Tax, Attributable to Parent Marketing and advertising Marketing and Advertising Expense 2029 Lessee, Operating Lease, Liability, to be Paid, Year Three Termination Date Trading Arrangement Termination Date Share-based payment arrangement, shares withheld for tax withholding obligation (in shares) Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Cash Contributions Nasdaq Clearing Members Cash Contributions Nordic Clearing Members Cash Contributions [Member] Nordic Clearing Members Cash Contributions [Member] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Consulting services Consulting Services [Member] Consulting Services [Member] Divestitures Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Other current liabilities Other Liabilities, Current Performance period Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period Other non-current assets Other Assets, Noncurrent Document Type Document Type Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Income tax benefit (expense) Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax Gain on extinguishment of debt Gain (Loss) on Extinguishment of Debt Fair Value as of Grant Date Award Grant Date Fair Value Clearing Operations [Table] Clearing Operations [Table] Clearing Operations [Table] Schedule of Goodwill [Table] Goodwill [Table] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Remaining authorized amount under share repurchase program Share Repurchase Program, Remaining Authorized, Amount Intangible asset, impairment loss Intangible Asset, Excluding Goodwill, Impairment Loss Fiscal Year Ended [Abstract] Fiscal Year Ended [Abstract] Fiscal Year Ended [Abstract] Arrangement Duration Trading Arrangement Duration Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Consolidation Items [Axis] Consolidation Items [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name June 2026 Accelerated Share Repurchase Agreement Program June 2026 Accelerated Share Repurchase Agreement Program [Member] June 2026 Accelerated Share Repurchase Agreement Program Exchange and clearing registrations Exchange And Clearing Registrations [Member] Exchange and clearing registrations [Member] Employee shares withheld (in shares) Stockholders' Equity, Other Shares Schedule of PSU Activity Share-Based Payment Arrangement, Performance Shares, Activity [Table Text Block] Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Total Default fund contributions and margin deposits Default Fund Contributions And Margin Deposits Default fund contributions and margin deposits Commitments and contingencies Commitments and Contingencies Gross Amount Intangible Asset, Finite-Lived, before Accumulated Amortization Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] 2030 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Four Net income from unconsolidated investees Net income from unconsolidated investees Net income (losses) from unconsolidated investees Income (Loss) from Equity Method Investments Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Performance-based long-term incentive program weighted percentage Performance Based Long Term Incentive Program Weighted Percentage Performance Based Long Term Incentive Program Weighted Percentage Executive Category: Executive Category [Axis] Vesting period/performance-based non-qualified stock options employment agreement. Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Goodwill [Roll Forward] Goodwill [Roll Forward] Intangible Asset, Finite-Lived, Class [Domain] Intangible Asset, Finite-Lived, Class [Domain] Trade names Trade Names [Member] Schedule of Financial Assets Measured at Fair Value on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Award Type [Domain] Award Type [Domain] Central bank certificates Central Bank Certificates [Member] Central Bank Certificates [Member] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Remainder of 2026 Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Level 3 Fair Value, Inputs, Level 3 [Member] Total debt obligations Payments (Accretions) And Other Of Long-Term And Short-Term Debt Payments (Accretions) And Other Of Long-Term And Short-Term Debt Common Stock, $0.01 par value per share Common Stock, $.01 Par Value Per Share, Nadasq Texas, LLC [Member] Common Stock, $.01 Par Value Per Share, Nadasq Texas, LLC Supplemental Disclosure - Cash Flow Information Supplemental Cash Flow Information [Abstract] Schedule of Defined Contribution Plan Disclosures Defined Contribution Plan Disclosures [Table Text Block] 2027 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year One Share price (in dollars per share) Share Price Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] 0.875% Senior Notes due 2030 Zero Point Eight Seven Five Percent Senior Notes Due 2030 [Member] Zero Point Eight Seven Five Percent Senior Notes Due 2030 [Member] PEO Name PEO Name Geographical [Axis] Geographical [Axis] Payments, Foreign Currency Translation and Accretion Payments (Accretions) And Other Of Long-term Debt Payments (Accretions) And Other Of Long-term Debt Beginning balance Ending balance Total Contract with Customer, Liability Additions Short-Term Debt, Current Period Additions, Amount Short-Term Debt, Current Period Additions, Amount Liability due to market default Liability Due To Market Default Liability Due To Market Default 2026 Contract With Customer, Liability, Expected To Be Recognized, Remainder Of Fiscal Year Contract With Customer, Liability, Expected To Be Recognized, Remainder Of Fiscal Year Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Legal Entity [Axis] Legal Entity [Axis] Gain (loss) foreign currency translation adjustment Intangible Asset, Finite-Lived, Foreign Currency Translation Gain (Loss) Schedule of Share-Based Compensation Expense Schedule Of Share Based Compensation Expense Resulting From Equity Awards [Table Text Block] Schedule of Share-Based Compensation Expense Resulting From Equity Awards [Text Block] Regulatory Regulatory Expenses Regulatory Operating expense includes cost incurred during the period associated with regulation of trading activity and the surveillance and investigation functions of Nasdaq. Weighted average exercise price, exercised (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Cash and cash equivalents, restricted cash and cash equivalents at beginning of period Cash and cash equivalents, restricted cash and cash equivalents at end of period Total Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Schedule of Finite-Lived Intangible Assets [Table] Intangible Asset, Finite-Lived [Table] Organization And Basis Of Presentation [Line Items] Organization And Basis Of Presentation [Line Items] Organization And Basis Of Presentation [Line Items] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Due to and from Broker-Dealers and Clearing Organizations [Abstract] Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Margin deposits Margin deposits Margin deposits Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Restricted cash and cash equivalents Restricted Cash and Cash Equivalent, Current Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest 2030 Notes 0.875 Senior Unsecured Notes Due February 13, 2030 [Member] 0.875 Senior Unsecured Notes Due February 13, 2030 Debt Instrument [Axis] Debt Instrument [Axis] Measurement Frequency [Domain] Measurement Frequency [Domain] Equity method investment, ownership percentage Equity Method Investment, Ownership Percentage Share-based compensation Share-Based Payment Arrangement, Noncash Expense Multilateral development bank debt securities Multilateral Development Banks [Member] Multilateral Development Banks 2028 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Two Compensation and benefits Labor and Related Expense Total lease cost Lease, Cost Schedule of Changes in Debt Obligations Schedule of Debt [Table Text Block] Employee stock purchase plan Employee Stock [Member] Investment, Name [Domain] Investment, Name [Domain] Leases Lessee, Operating Leases [Text Block] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Basic earnings per share (in dollars per share) Earnings Per Share, Basic Repurchases of common stock Repurchases of common stock Payments for Repurchase of Common Stock Deferred revenue Contract with Customer, Liability, Current Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Adenza restructuring Adenza Restructuring Plan [Member] Adenza Restructuring Plan Additions Long-term Debt, Current Period Additions, Amount Long-term Debt, Current Period Additions, Amount Long-term debt Long-Term Debt, Excluding Current Maturities Award Type [Axis] Award Type [Axis] Schedule of Derivative Contracts Cleared Schedule of Derivative Contracts Cleared [Table Text Block] Schedule of Derivative Contracts Cleared. Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Schedule of Common Stock in Treasury Class of Treasury Stock [Table Text Block] Retained earnings Retained Earnings (Accumulated Deficit) Restructuring and Related Activities [Abstract] Product and Service [Axis] Product and Service [Axis] Equity securities Equity Securities, FV-NI Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common stock Common Stock [Member] Expected volatility Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Employee-related costs Employee Severance [Member] Operating lease cost Operating Lease, Cost Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] 2034 Notes Five Point Five Five Senior Unsecured Notes Due 2034 [Member] Five Point Five Five Senior Unsecured Notes Due 2034 Reclassification Reclassification, Comparability Adjustment [Policy Text Block] All other countries Non-US [Member] Derivative Contract [Domain] Derivative Contract [Domain] Equity securities not have readily determinable fair value Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount Foreign currency translation adjustments Goodwill, Foreign Currency Translation, Gain (Loss) Equity Awards Adjustments Equity Awards Adjustments [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Total liabilities and equity Liabilities and Equity Variable lease cost Variable Lease, Cost Other Other [Member] Primarily Non-US Listing Of Additional Shares Fees Employee Stock Option Share-Based Payment Arrangement, Option [Member] Short-term debt Debt, Current Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table] Noncontrolling interests Equity, Attributable to Noncontrolling Interest Approximate combined market capitalization Approximate Combined Market Capitalization Approximate Combined Market Capitalization Other liabilities Increase (Decrease) in Other Operating Liabilities Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Plan Name [Axis] Plan Name [Axis] Restructuring charges Restructuring charges Total restructuring charges Restructuring Charges Below Manager Level Below Manager Level [Member] Below Manager Level Accelerated Share Repurchases, Date [Domain] Accelerated Share Repurchases, Date [Domain] Financial investments Debt Securities, Trading Tabular List, Table Tabular List [Table Text Block] Vesting [Axis] Vesting [Axis] Additional paid-in capital Additional Paid in Capital 2031+ Finite-Lived Intangible Asset, Expected Amortization, After Year Four Finite-Lived Intangible Asset, Expected Amortization, After Year Four Other income (losses) Other Nonoperating Income (Expense) Schedule of Acquired Indefinite-lived Intangible Assets Intangible Asset, Indefinite-Lived, Acquired [Table Text Block] Nasdaq Clearing Nasdaq Clearing Operations [Member] Nasdaq Clearing Operations [Member] Total number of listed companies within Nordic and Baltic exchanges (in companies) Total Number Of Listed Companies Within US, Nordic And Baltic Exchanges Total Number of Listed Companies within US, Nordic and Baltic Exchanges 2029 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Three Remainder of 2026 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Remainder of Fiscal Year Name Awards Close in Time to MNPI Disclosures, Individual Name Equity Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Aggregate intrinsic value, outstanding Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Three-Year Program Three-Year Program Three Year Performance Share Unit Program [Member] Three Year Performance Share Unit Program Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period General, administrative and other General and Administrative Expense Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Maximum payout (as a percent) Share Based Compensation Arrangement By Share Based Payment Award Percentage Of Shares Earned 2 Share Based Compensation Arrangement By Share Based Payment Award Percentage Of Shares Earned 2 Receivables, net Receivables, Net, Current Adjustment to Compensation: Adjustment to Compensation [Axis] Share repurchase program Share Repurchase Program [Member] Share Repurchase Program Payments, Foreign Currency Translation and Accretion Payments (Accretions) And Other of Short-term Debt Payments (Accretions) And Other of Short-term Debt Investments, Debt and Securities [Line Items] Investments, Debt and Securities [Line Items] Investments, Debt and Securities [Line Items] Schedule of Investments Schedule of Investments [Table Text Block] Schedule of Investments Share Repurchase Program [Axis] Share Repurchase Program [Axis] Dividends Payable [Line Items] Dividends Payable [Line Items] Dividends Payable [Table] Dividends Payable [Table] Capital Access Platforms Capital Access Platforms Capital Access Platforms [Member] Capital Access Platforms [Member] Class of Stock [Domain] Class of Stock [Domain] Total Finite Lived Intangible Assets Net Excluding Foreign Currency Translation Adjustment Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. Excluding the impact of foreign currency translation adjustment. Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Schedule of Balance Sheet Information Assets and Liabilities, Lessee [Table Text Block] Assets and Liabilities, Lessee [Table Text Block] Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activity Statement of Cash Flows [Abstract] Restricted cash and equivalents, in default funds and margin deposits Restricted cash and cash equivalents (default funds and margin deposits) Restricted Cash And Equivalents, In Default Funds And Margin Deposits Restricted Cash And Equivalents, In Default Funds And Margin Deposits Other Other General Expense Credit Facility [Axis] Credit Facility [Axis] Restructuring Charges Restructuring and Related Activities Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Total assets at fair value Fair value assets Assets, Fair Value Disclosure Discontinued Operations and Disposal Groups [Abstract] Name Measure Name Income Taxes Income Tax Disclosure [Text Block] Foreign currency translation gains (losses) Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Other reconciling items included in net income Other Noncash Income (Expense) Debt Instrument [Line Items] Debt Instrument [Line Items] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Additional paid-in capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Indefinite-lived Intangible Assets [Axis] Intangible Asset, Indefinite-Lived, Class [Axis] Goodwill, impairment loss Goodwill, Impairment Loss Name Trading Arrangement, Individual Name 2031+ Lessee, Operating Lease, Liability, to be Paid, After Year Four Lessee, Operating Lease, Liability, to be Paid, After Year Four Cash and cash equivalents Cash and Cash Equivalent Schedule of Debt [Table] Schedule of Debt [Table] Schedule of Debt [Table] Current lease liability, statement of financial position [Extensible Enumeration] Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Company Selected Measure Amount Company Selected Measure Amount Investments, Debt and Equity Securities [Abstract] Net income Net income Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Power of assessment of the clearing member's contribution to the financial markets and commodities markets default funds (as a percent) Contribution To Financial Markets Contribution to the financial markets. Incremental gain cost to sell Discontinued Operation, Amount of Adjustment to Prior Period Gain (Loss) on Disposal, Net of Tax Current assets: Assets, Current [Abstract] Weighted-average remaining lease term (in years) Operating Lease, Weighted Average Remaining Lease Term Non-PEO NEO Non-PEO NEO [Member] Senior notes Senior Notes [Member] Entity Address, Address Line One Entity Address, Address Line One Lease assets obtained in exchange for operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Vested (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Proceeds from sales and redemptions of securities Proceeds from Sale, Maturity and Collection of Short-Term Investments Income tax provision Income Tax Expense (Benefit) Gain (loss) currency translation adjustment Gain (Loss), Foreign Currency Transaction, before Tax Transaction-based expenses Transaction-based expenses Cost of Product and Service Sold Market value of derivative contracts Derivative Contracts Market Value Derivative contracts market value Award Timing Method Award Timing Method [Text Block] Principles of Consolidation Consolidation, Policy [Policy Text Block] Net decrease in cash and cash equivalents and restricted cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] 2028 Contract With Customer, Liability, Expected To Be Recognized In Year Two Contract With Customer, Liability, Expected To Be Recognized In Year Two 2026 Notes Three Point Eight Five Senior Secured Notes Due June 30 2026 [Member] Three Point Eight Five Senior Secured Notes Due June 30 2026 [Member] Net income attributable to Nasdaq Net income attributable to Nasdaq Net income attributable to common shareholders Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Demand deposits Demand Deposits [Member] Investments Investments [Member] Unamortized debt issuance expense Unamortized Debt Issuance Expense Statement [Table] Statement [Table] Second Anniversary Share-Based Payment Arrangement, Tranche Two [Member] Other revenues Reconciling items Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] Restatement Determination Date: Restatement Determination Date [Axis] Proceeds from stock options exercised Proceeds from Stock Options Exercised 2053 Notes Five Point Nine Five Senior Unsecured Notes Due 2053 [Member] Five Point Nine Five Senior Unsecured Notes Due 2053 Schedule of Remaining Performance Obligation Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] Interest income Investment Income, Interest Schedule of Changes in Deferred Revenue Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Receivables, net Increase (Decrease) in Receivables 1.75% Senior Notes due 2029 One Point Seven Five Percent Senior Unsecured Notes Due 2029 [Member] One Point Seven Five Percent Senior Unsecured Notes Due 2029 [Member] Option to increase available aggregate amount Line Of Credit Facility, Optional Increase In Maximum Borrowing Capacity Line Of Credit Facility, Optional Increase In Maximum Borrowing Capacity Non-Cash Contributions Nordic Clearing Members Non Cash Contributions [Member] Nordic Clearing Members Non Cash Contributions [Member] Revenues: Revenues [Abstract] Basis of Presentation and Principles of Consolidation Basis of Presentation and Significant Accounting Policies [Text Block] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]