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Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net income attributable to Nasdaq $ 458 $ 729 $ 106
Other comprehensive income (loss):      
Foreign currency translation gains (losses) (240) 214 (183)
Income tax benefit (expense) (11) (96) 68
Foreign currency translation, net (251) 118 (115)
Employee benefit plan adjustment gains (losses) 9 (2) 0
Employee benefit plan income tax (benefit) expense (9) 1 0
Employee benefit plan, net 0 (1) 0
Total other comprehensive income (loss), net of tax [1] (251) 117 (115)
Comprehensive income (loss) attributable to Nasdaq 207 $ 846 $ (9)
Accumulated Other Comprehensive Loss | Accounting Standards Update 2018-02      
Reclassification from AOCI, tax amount $ (417)    
[1] (1) Excludes a reclassification impact of Tax Reform of $417 million. See “Tax Cuts and Jobs Act,” of Note 17, “Income Taxes,” for further discussion.