CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 1,372	$ 780	$ 859
Other comprehensive income (loss):
Foreign currency translation adjustments	478	(311)	(123)
Derivative instrument adjustments, net of tax	(14)	1	10
Unrealized (loss) gain on available-for-sale securities, net of tax	(2)	2	(7)
Pension and postretirement adjustments, net of tax	7	5	0
Reclassification of losses (gains), net of tax	11	2	(6)
Total other comprehensive income (loss), net of tax	480	(301)	(126)
Comprehensive income	$ 1,852	$ 479	$ 733