Condensed Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Revenues:
Total revenues	$ 2,532	$ 2,101	$ 4,670	$ 4,196
Transaction-based expenses:
Transaction-based expenses	(1,032)	(795)	(1,762)	(1,653)
Revenues less transaction-based expenses	1,500	1,306	2,908	2,543
Operating expenses:
Compensation and benefits	383	352	739	681
Professional and contract services	42	39	82	75
Technology and communication infrastructure	88	79	171	156
Occupancy	35	30	68	58
General, administrative and other	23	23	52	29
Marketing and advertising	24	14	44	28
Depreciation and amortization	165	158	331	313
Regulatory	9	14	19	29
Merger and strategic initiatives	5	20	9	44
Restructuring charges	14	9	24	15
Total operating expenses	788	738	1,539	1,428
Operating income	712	568	1,369	1,115
Interest income	8	12	13	24
Interest expense	(86)	(95)	(172)	(192)
Net gain on divestitures	0	39	89	39
Other income (losses)	(2)	1	(15)	0
Net income from unconsolidated investees	21	23	47	50
Income before income taxes	653	548	1,331	1,036
Income tax provision	146	96	305	190
Net income	507	452	1,026	846
Net loss attributable to noncontrolling interests	0	0	0	1
Net income attributable to Nasdaq	$ 507	$ 452	$ 1,026	$ 847
Per share information:
Basic earnings per share (in dollars per share)	$ 0.90	$ 0.79	$ 1.81	$ 1.47
Diluted earnings per share (in dollars per share)	0.89	0.78	1.80	1.46
Cash dividends declared per common share (in dollars per share)	$ 0.31	$ 0.27	$ 0.58	$ 0.51
Transaction rebates
Transaction-based expenses:
Transaction-based expenses	$ (712)	$ (640)	$ (1,436)	$ (1,224)
Brokerage, clearance and exchange fees
Transaction-based expenses:
Transaction-based expenses	(320)	(155)	(326)	(429)
Operating segments | Capital Access Platforms
Revenues:
Total revenues	621	520	1,186	1,028
Operating expenses:
Depreciation and amortization	12	11	39	21
Operating income	394	307	743	614
Operating segments | Financial Technology
Revenues:
Total revenues	539	464	1,057	896
Operating expenses:
Depreciation and amortization	20	13	23	25
Operating income	250	217	496	414
Operating segments | Market Services
Revenues:
Total revenues	1,372	1,101	2,419	2,240
Transaction-based expenses:
Transaction-based expenses	(1,032)	(795)	(1,762)	(1,653)
Revenues less transaction-based expenses	340	306	657	587
Operating expenses:
Depreciation and amortization	11	11	25	22
Operating income	218	194	419	367
Other revenues
Revenues:
Total revenues	$ 0	$ 16	$ 8	$ 32