Consolidated Statements of Comprehensive (Loss) Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Net (loss) income	$ (3,790)	$ 704	$ (7,995)	$ 1,990
Defined benefit plans:
Amortization of unrecognized amounts included in net periodic benefit costs	8	5	24	12
Foreign exchange gains (losses)	7	2	12	(1)
Other comprehensive income	15	7	36	11
Total comprehensive (loss) income	(3,775)	711	(7,959)	2,001
Total comprehensive income attributable to noncontrolling interests	(30)	(142)	(130)	(416)
Preferred dividends attributable to redeemable noncontrolling interest	(11)	(10)	(31)	(30)
Total comprehensive (loss) income attributable to common stockholders	$ (3,816)	$ 559	$ (8,120)	$ 1,555