Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net income (loss)	$ 298	$ 290
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	10	8
Net change in derivative financial instruments	(80)	(55)
Total other comprehensive income (loss)	(69)	(47)
Total comprehensive income (loss)	$ 228	$ 243