Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Tax (benefit) expense on currency translation adjustments	$ (5)	$ (52)	$ 89
Tax expense (benefit) on pension and other employee benefits	130	10	60
Tax (benefit) expense on hedging activities	(11)
Tax (benefit) expense on hedging activities		3	(6)
Tax expense on available-for-sale securities	$ 0	$ 0	$ 0