Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net income (loss)	$ (667)	$ 3,501	$ 2,135
Other comprehensive income, net of income taxes:
Defined benefit and other postretirement plans adjustments	105	(84)	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(67)	0	0
Other	(2)	(7)	2
Other comprehensive income (loss), net of income taxes	36	(92)	2
Comprehensive income (loss)	(631)	3,410	2,137
Comprehensive income attributable to noncontrolling interest	(4)	(1)	(10)
Comprehensive income (loss) attributable to company shareholders	$ (635)	$ 3,409	$ 2,127