Condensed Consolidated Statements of Changes in Stockholders’ Equity - USD ($) $ in Millions	Total	Share repurchase program	Total Nasdaq stockholders’ equity	Common stock	Additional paid-in capital	Additional paid-in capital Share repurchase program	Common stock in treasury, at cost	Accumulated other comprehensive loss	Retained earnings	Noncontrolling interests
Beginning balance (in shares) at Dec. 31, 2024				575,000,000
Beginning balance at Dec. 31, 2024				$ 6	$ 5,530		$ (647)	$ (2,099)	$ 8,401	$ 9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share repurchase program (in shares)						(3,000,000)
Share repurchase program						$ (215)
Share-based compensation (in shares)					2,000,000
Share-based compensation					$ 81
Issuance of stock under employee stock plans (in shares)					0
Issuance of stock under employee stock plans					$ 0
Other issuances of common stock, net (in shares)					0
Other issuances of common stock, net					$ 29
Employee shares withheld (in shares)							0
Employee shares withheld							$ (59)
Other comprehensive income (loss)	$ 230							230
Net income attributable to Nasdaq	$ 847								847
Cash dividends declared and paid									(293)
Net activity related to noncontrolling interests										(2)
Ending balance (in shares) at Jun. 30, 2025	574,000,000
Ending balance at Jun. 30, 2025	$ 11,818		$ 11,811		5,425		(706)	(1,869)	8,955	7
Beginning balance (in shares) at Mar. 31, 2025				574,000,000
Beginning balance at Mar. 31, 2025				$ 6	$ 5,450		$ (672)	(1,896)	8,658	9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share repurchase program (in shares)						(1,000,000)
Share repurchase program						$ (100)
Share-based compensation (in shares)					1,000,000
Share-based compensation					$ 46
Issuance of stock under employee stock plans (in shares)					0
Issuance of stock under employee stock plans					$ 0
Other issuances of common stock, net (in shares)					0
Other issuances of common stock, net					$ 29
Employee shares withheld (in shares)							0
Employee shares withheld							$ (34)
Other comprehensive income (loss)	27							27
Net income attributable to Nasdaq	$ 452								452
Cash dividends declared and paid									(155)
Net activity related to noncontrolling interests										(2)
Ending balance (in shares) at Jun. 30, 2025	574,000,000
Ending balance at Jun. 30, 2025	$ 11,818		11,811		5,425		(706)	(1,869)	8,955	7
Beginning balance (in shares) at Dec. 31, 2025	569,894,024			570,000,000
Beginning balance at Dec. 31, 2025	$ 12,232			$ 6	5,122		(716)	(1,773)	9,588	5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends declared and paid	$ (153)
Ending balance (in shares) at Mar. 31, 2026				565,000,000
Ending balance at Mar. 31, 2026				$ 6	4,627		(747)	(1,807)	9,954	5
Beginning balance (in shares) at Dec. 31, 2025	569,894,024			570,000,000
Beginning balance at Dec. 31, 2025	$ 12,232			$ 6	$ 5,122		$ (716)	(1,773)	9,588	5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share repurchase program (in shares)		(10,392,733)				(10,000,000)
Share repurchase program						$ (903)
Share-based compensation (in shares)					2,000,000
Share-based compensation					$ 87
Issuance of stock under employee stock plans (in shares)					1,000,000
Issuance of stock under employee stock plans					$ 18
Other issuances of common stock, net (in shares)					0
Other issuances of common stock, net					$ 29
Employee shares withheld (in shares)							(1,000,000)
Employee shares withheld							$ (68)
Other comprehensive income (loss)	(101)							(101)
Net income attributable to Nasdaq	1,026								1,026
Cash dividends declared and paid	$ (327)								(327)
Net activity related to noncontrolling interests										0
Ending balance (in shares) at Jun. 30, 2026	561,990,385
Ending balance at Jun. 30, 2026	$ 11,993		11,988		4,353		(784)	(1,874)	10,287	5
Beginning balance (in shares) at Mar. 31, 2026				565,000,000
Beginning balance at Mar. 31, 2026				$ 6	$ 4,627		$ (747)	(1,807)	9,954	5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share repurchase program (in shares)						(4,000,000)
Share repurchase program						$ (356)
Share-based compensation (in shares)					1,000,000
Share-based compensation					$ 50
Issuance of stock under employee stock plans (in shares)					0
Issuance of stock under employee stock plans					$ 3
Other issuances of common stock, net (in shares)					0
Other issuances of common stock, net					$ 29
Employee shares withheld (in shares)							0
Employee shares withheld							$ (37)
Other comprehensive income (loss)	(67)							(67)
Net income attributable to Nasdaq	507								507
Cash dividends declared and paid	$ (174)								(174)
Net activity related to noncontrolling interests										0
Ending balance (in shares) at Jun. 30, 2026	561,990,385
Ending balance at Jun. 30, 2026	$ 11,993		$ 11,988		$ 4,353		$ (784)	$ (1,874)	$ 10,287	$ 5