Consolidated Statements of Comprehensive (Loss) Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Net (loss) income	$ (1,799)	$ 660	$ (4,205)	$ 1,286
Defined benefit plans:
Amortization of unrecognized amounts included in net periodic benefit costs	8	4	16	7
Foreign exchange gains (losses)	1	(3)	5	(3)
Other comprehensive income	9	1	21	4
Total comprehensive (loss) income	(1,790)	661	(4,184)	1,290
Total comprehensive income attributable to noncontrolling interests	(42)	(168)	(100)	(274)
Preferred dividends attributable to redeemable noncontrolling interest	(10)	(10)	(20)	(20)
Total comprehensive (loss) income attributable to common stockholders	$ (1,842)	$ 483	$ (4,304)	$ 996