Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net loss	$ (468)	$ (5,769)	$ (667)
Other comprehensive income (loss), net of income taxes:
Defined benefit and other postretirement plans adjustments	(22)	(92)	105
Unrealized loss on cash flow hedges	0	0	(67)
Other	7	1	(2)
Other comprehensive income (loss), net of income taxes	(15)	(91)	36
Comprehensive loss	(483)	(5,860)	(631)
Comprehensive (income) loss attributable to noncontrolling interest	5	6	(4)
Comprehensive loss attributable to company shareholders	$ (478)	$ (5,854)	$ (635)