CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Comprehensive income (loss):
Net income (loss)	$ (770)	$ 107	$ (6,942)
Comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(2)	14	(174)
Unrecognized pension and postretirement costs	43	(1)	42
Derivative financial instruments	(1)	(20)	45
Total other comprehensive income (loss), net of tax	40	(7)	(87)
Comprehensive income (loss) including noncontrolling interest	(730)	100	(7,029)
Total comprehensive income (loss) attributable to noncontrolling interests	(4)	1	(2)
Total comprehensive income (loss) attributable to parent	$ (726)	$ 99	$ (7,027)