Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income		$ 177	$ 168
Foreign currency translation gains (losses):
Net foreign currency translation gains (losses)		(76)	42
Income tax expense	[1]	(115)	(50)
Total		(191)	(8)
Employee benefit plan income tax expense		(7)	0
Total other comprehensive loss, net of tax		(198)	(8)
Comprehensive income (loss) attributable to Nasdaq		$ (21)	$ 160

[1] Includes the reclassification of the stranded tax effects related to the Tax Cuts and Jobs Act. See Note 17, “Income Taxes,” for further discussion.