Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Revenues less transaction-based expenses	$ 892	$ 851
Operating expenses:
Compensation and benefits	254	239
Professional and contract services	35	27
Computer operations and data communications	50	44
Occupancy	27	28
General, administrative and other	21	13
Marketing and advertising	10	10
Depreciation and amortization	67	63
Regulatory	8	7
Merger and strategic initiatives	15	45
Restructuring charges	0	10
Total operating expenses	487	486
Operating income	405	365
Interest income	0	1
Interest expense	(32)	(29)
Other (loss) income	(6)	1
Net income from unconsolidated investees	7	57
Income before income taxes	374	395
Income tax provision	91	97
Net income	283	298
Net loss attributable to noncontrolling interests	1	0
Net income attributable to Nasdaq	$ 284	$ 298
Per share information:
Basic earnings per share (in dollars per share)	$ 1.72	$ 1.81
Diluted earnings per share (in dollars per share)	1.70	1.78
Cash dividends declared per common share (in dollars per share)	$ 0.54	$ 0.49
Revenues:
Total revenues	$ 1,535	$ 1,651
Transaction rebates
Transaction-based expenses:
Transaction-based expenses	(581)	(654)
Brokerage, clearance and exchange fees
Transaction-based expenses:
Transaction-based expenses	(62)	(146)
Operating Segments | Market Technology
Income Statement [Abstract]
Revenues less transaction-based expenses	124	100
Operating expenses:
Operating income	4	(2)
Revenues:
Total revenues	124	100
Operating Segments | Investment Intelligence
Income Statement [Abstract]
Revenues less transaction-based expenses	284	256
Operating expenses:
Operating income	184	166
Revenues:
Total revenues	284	256
Operating Segments | Corporate Platforms
Income Statement [Abstract]
Revenues less transaction-based expenses	168	146
Operating expenses:
Operating income	75	58
Revenues:
Total revenues	168	146
Operating Segments | Market Services
Income Statement [Abstract]
Revenues less transaction-based expenses	315	334
Operating expenses:
Operating income	200	226
Revenues:
Total revenues	958	1,134
Segment Reconciling Items
Revenues:
Total revenues	$ 1	$ 15