Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net income (loss)	$ 432	$ 283	$ 1,285	$ 719
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	(6)	25	(42)	46
Net change in derivative financial instruments	47	(24)	125	(100)
Net change in available-for-sale securities	0	1	0	3
Net change in defined benefit pensions and other items	0	0	0	(1)
Total other comprehensive income (loss)	40	2	82	(52)
Total comprehensive income (loss)	$ 472	$ 285	$ 1,367	$ 667