Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net income (loss)	$ 1,657	$ (468)	$ (5,769)
Other comprehensive income (loss), net of income taxes:
Defined benefit and other postretirement plans adjustments	131	(22)	(92)
Other	(17)	7	1
Other comprehensive income (loss), net of income taxes	114	(15)	(91)
Comprehensive income (loss)	1,771	(483)	(5,860)
Comprehensive (income) loss attributable to noncontrolling interest	(1)	5	6
Comprehensive income (loss) attributable to company shareholders	$ 1,770	$ (478)	$ (5,854)