Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net income (loss)	$ (1,129)	$ 1,657	$ (468)
Other comprehensive income (loss), net of income taxes:
Defined benefit and other postretirement plans adjustments	(11)	131	(22)
Other	3	(17)	7
Other comprehensive income (loss), net of income taxes	(8)	114	(15)
Comprehensive income (loss)	(1,137)	1,771	(483)
Comprehensive (income) loss attributable to noncontrolling interest	(2)	(1)	5
Comprehensive income (loss) attributable to company shareholders	$ (1,139)	$ 1,770	$ (478)