Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 389	$ 272
Other comprehensive income (loss), net of tax:
Currency translation adjustments, net of tax (benefit) expense of ($7) and $20 for the three months ended March 31, 2018 and 2017, respectively	81	122
Pension and other employee benefits, net of tax expense of $13 and $10 for the three months ended March 31, 2018 and 2017, respectively	52	21
Hedging activities, net of tax expense (benefit) of $1 and ($4) for the three months ended March 31, 2018 and 2017, respectively	(5)	(7)
Available-for-sale securities, net of tax expense of zero for the three months ended March 31, 2018 and 2017.		2
Total other comprehensive income (loss), net of tax	128	138
Comprehensive income	$ 517	$ 410