Commitments, Contingencies and Guarantees (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Commitments and Contingencies Disclosure [Abstract]
Financial guarantees obtained	$ 4	$ 4

Financial Guarantees Obtained To Provide Further Liquidity And Default Protection Related To Clearing Businesses

No definition available.

Name:	ndaq_FinancialGuaranteesObtainedToProvideFurtherLiquidityAndDefaultProtectionRelatedToClearingBusinesses
Namespace Prefix:	ndaq_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant