Consolidated Statements Of Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Accumulated Other Comprehensive Earnings [Member]	Treasury Stock [Member]	Noncontrolling Interests [Member]	Total
Balance, at Dec. 31, 2014	$ 41	$ 4,088	$ 16,631	$ 779		$ 4,802	$ 26,341
Balance, shares, at Dec. 31, 2014	409
Net earnings (loss)			(3,599)			10	(3,589)
Other comprehensive earnings (loss), net of tax				(298)			(298)
Restricted stock grants, net of cancellations, shares	2
Common stock repurchased					$ (18)		(18)
Common stock retired		(18)			18
Common stock dividends			(99)				(99)
Share-based compensation		48					48
Share-based compensation tax benefits		1					1
Subsidiary equity transactions		423				263	686
Distributions to noncontrolling interests						(53)	(53)
Balance, at Mar. 31, 2015	$ 41	4,542	12,933	481		5,022	23,019
Balance, shares, at Mar. 31, 2015	411
Balance, at Dec. 31, 2015	$ 42	4,996	1,781	230		3,940	10,989
Balance, shares, at Dec. 31, 2015	418
Net earnings (loss)			(3,056)			(412)	(3,468)
Other comprehensive earnings (loss), net of tax				27			27
Restricted stock grants, net of cancellations, shares	3
Common stock repurchased					(12)		(12)
Common stock retired		(12)			$ 12
Common stock dividends			(125)				(125)
Common stock issued	$ 10	2,117					2,127
Common stock issued, shares	103
Share-based compensation		99					99
Subsidiary equity transactions		301				643	944
Distributions to noncontrolling interests						(73)	(73)
Balance, at Mar. 31, 2016	$ 52	$ 7,501	$ (1,400)	$ 257		$ 4,098	$ 10,508
Balance, shares, at Mar. 31, 2016	524