Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net income (loss)	$ 4,700	$ 1,671	$ 104
Foreign currency translation adjustment	195	(21)	48
Net change in derivative financial instruments	62	110	(106)
Net change in available-for-sale securities	0	0	5
Net change in defined benefit pensions and other items	(20)	2	(6)
Total other comprehensive income (loss)	237	91	(59)
Total comprehensive income (loss)	$ 4,937	$ 1,761	$ 45