Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income		$ 264	$ 150	$ 708	$ 571
Other comprehensive income (loss):
Foreign currency translation gains (losses)		60	(121)	29	(256)
Income tax benefit (expense)	[1]	23	(46)	25	(47)
Foreign currency translation, net		83	(167)	54	(303)
Comprehensive income (loss) attributable to Nasdaq		$ 347	$ (17)	$ 762	$ 268

[1] Primarily relates to the tax effect of unrealized gains and losses on Euro denominated notes.