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All other countries Non-US [Member] Accounting Policies [Abstract] Accounting Policies [Abstract] Liabilities Liabilities: Liabilities [Abstract] Revenues: Revenues [Abstract] Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Current Fiscal Year End Date Current Fiscal Year End Date Less: interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount At or Above Manager Level At or Above Manager Level [Member] At or Above Manager Level PEO Name PEO Name Number of shares purchased (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period Vesting [Axis] Vesting [Axis] Award Type [Domain] Award Type [Domain] 2040 Notes Two Point Five Zero Zero Senior Unsecured Notes Due 2040 [Member] Two Point Five Zero Zero Senior Unsecured Notes Due 2040 Cash and cash equivalents Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents Market Services Market Services Market 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[Member] Financial Technology Reductions related to settlements with taxing authorities Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities Proceeds from sales and redemptions of securities Proceeds from Sale, Maturity and Collection of Short-Term Investments Increase (decrease) in denominated notes Debt Instrument, Increase (Decrease), Net Auditor Firm ID Auditor Firm ID Effective tax rate Effective Income Tax Rate Reconciliation, Percent Operating income Operating income (loss) Operating loss Operating Income (Loss) Committed capital Committed Capital Committed Capital - Nasdaq Clearing Article 16 Capital Number of reportable segments (in segments) Number of Reportable Segments Total liabilities and equity Liabilities and Equity Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Foreign net operating loss Deferred Tax Assets, Operating Loss 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Schedule of Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Accrued personnel costs Increase (Decrease) in Employee Related Liabilities Arrangement Duration Trading Arrangement Duration Deferred Tax Liabilities, Depreciation Deferred Tax Liabilities, Depreciation Deferred Tax Liabilities, Depreciation Restricted Cash and Equivalents Restricted Cash And Cash Equivalents [Member] Restricted Cash And Cash Equivalents Goodwill and Acquired Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Employee benefit plan adjustment Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax State-owned enterprises and municipal securities State Owned Enterprises And Municipalities Debt Securities [Member] State Owned Enterprises And Municipalities Debt Securities [Member] Nasdaq stockholders’ equity: Equity, Attributable to Parent [Abstract] Thoma Bravo Thoma Bravo [Member] Thoma Bravo Payment for default funds and margin deposits Repayment For Default Funds And Margin Deposits Repayment For Default Funds And Margin Deposits Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Credit facility term Debt Instrument, Term Debt instrument, repurchase amount Debt Instrument, Repurchase Amount Trade names and other Trade Names And Other Intangible Assets [Member] Trade Names And Other Intangible Assets 2028 Finite-Lived Intangible Asset, Expected Amortization, Year Four All Individuals All Individuals [Member] 2031 Notes One Point Six Five Zero Senior Unsecured Notes Due 2031 [Member] One Point Six Five Zero Senior Unsecured Notes Due 2031 Reporting Unit [Axis] Reporting Unit [Axis] Brokerage, clearance and exchange fees Brokerage, Clearance And Exchange Fees [Member] Brokerage, Clearance And Exchange Fees [Member] Renewal fee, recognition period Renewal Fee, Recognition Period Renewal Fee, Recognition Period Debt security Debt Security, Corporate, US [Member] Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Entities [Table] Entities [Table] Number of member sponsored default funds (in funds) Number of member sponsored default funds Number of member sponsored default funds Other income (loss) Other Nonoperating Income (Expense) Deferred interest expense Deferred Tax Assets, Interest Expense Deferred Tax Assets, Interest Expense Contract value of resale and repurchase agreements Contract Value Of Resale And Repurchase Agreements Contract value of resale and repurchase agreements. 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Bradley J. Peterson [Member] Bradley J. 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Excluding the impact of foreign currency translation adjustment. 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Operating Loss Carryforwards, Subject to Expiration Company Selected Measure Name Company Selected Measure Name