Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 272	$ 3,380
Other comprehensive income (loss), net of tax:
Currency translation adjustments, net of tax expense of $20 and $14 for the three months ended March 31, 2017 and 2016, respectively	122	92
Pension and other employee benefits, net of tax expense of $10 and $11 for the three months ended March 31, 2017 and 2016, respectively	21	21
Hedging activities, net of tax benefit of ($4) and ($3) for the three months ended March 31, 2017 and 2016, respectively	(7)	(6)
Available-for-sale securities, net of tax expense of zero for the three months ended March 31, 2017 and 2016.	2	(3,366)
Total other comprehensive income (loss), net of tax	138	(3,259)
Comprehensive income	$ 410	$ 121