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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]      
Tax (benefit) expense on currency translation adjustments $ 91 $ 39 $ 107
Tax expense (benefit) on pension and other employee benefits 62 36 104
Tax (benefit) expense on hedging activities 6 2 9
Tax expense on available-for-sale securities $ 0 $ 0 $ 6