Consolidated Statements of Comprehensive (Loss) Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net income (loss)	$ 286	$ (3,790)	$ (4,225)	$ (7,995)
Other comprehensive income, net of taxes:
Unrealized gains on securities	2	0	3	0
Defined benefit plans:
Amortization of unrecognized amounts included in net periodic benefit costs	11	8	34	24
Foreign exchange (losses) gains	(1)	7	(11)	12
Other comprehensive income	12	15	26	36
Total comprehensive income (loss)	298	(3,775)	(4,199)	(7,959)
Total comprehensive income attributable to noncontrolling interests	(59)	(30)	(189)	(130)
Preferred dividends attributable to redeemable noncontrolling interest	(10)	(11)	(31)	(31)
Total comprehensive income (loss) attributable to common stockholders	$ 229	$ (3,816)	$ (4,419)	$ (8,120)