Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net income (loss)	$ 126	$ 432	$ 704	$ 1,285
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	(2)	(6)	4	(42)
Net change in derivative financial instruments	62	47	102	125
Net change in defined benefit pensions and other items	0	0	(1)	0
Total other comprehensive income (loss)	60	40	105	82
Total comprehensive income (loss)	$ 186	$ 472	$ 809	$ 1,367