Consolidated Statements of Comprehensive (Loss) Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net loss	$ (410)	$ (1,799)	$ (4,511)	$ (4,205)
Other comprehensive income, net of taxes:
Unrealized gains on securities	1	0	1	0
Defined benefit plans:
Amortization of unrecognized amounts included in net periodic benefit costs	15	8	23	16
Foreign exchange (losses) gains	(1)	1	(10)	5
Other comprehensive income	15	9	14	21
Total comprehensive loss	(395)	(1,790)	(4,497)	(4,184)
Total comprehensive income attributable to noncontrolling interests	(59)	(42)	(130)	(100)
Preferred dividends attributable to redeemable noncontrolling interest	(10)	(10)	(21)	(20)
Total comprehensive loss attributable to common stockholders	$ (464)	$ (1,842)	$ (4,648)	$ (4,304)