Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net income (loss)	$ (82)	$ 4,700	$ 1,671
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	76	195	(21)
Net change in derivative financial instruments	(137)	62	110
Defined benefit pensions and other items	(1)	(20)	2
Total other comprehensive income (loss)	(63)	237	91
Total comprehensive income (loss)	$ (145)	$ 4,937	$ 1,761