Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net income (loss)	$ 290	$ 202
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	8	16
Net change in unrealized gains and losses on derivative financial instruments	(55)	(69)
Total other comprehensive income (loss)	(47)	(53)
Total comprehensive income (loss)	$ 243	$ 149