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Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income		$ 163	$ 170	$ 502	$ 483
Foreign currency translation gains (losses):
Net foreign currency translation gains (losses)		22	92	(239)	258
Income tax (expense)	[1]	(15)	(25)	(76)	(104)
Total		7	67	(315)	154
Employee benefit plan income tax (expense)	[1]	0	0	(7)	0
Total other comprehensive income (loss), net of tax		7	67	(322)	154
Comprehensive income attributable to Nasdaq		$ 170	$ 237	$ 180	$ 637
[1] For the nine months ended September 30, 2018, includes the reclassification of the stranded tax effects related to the Tax Cuts and Jobs Act. See Note 17, “Income Taxes,” for further discussion.

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