CONSOLIDATED STATEMENTS OF EQUITY (USD $) In Millions	Total	Common Stock [Member]	Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interests [Member]
Balance at Dec. 31, 2011	$ 18,983	$ 51	$ 7,851	$ 11,619	$ (804)	$ (612)	$ 878
Net income (loss)	2,445			2,391			54
Common stock issued	249		249
Dividends—common stock	(181)			(181)
Repurchase of common stock	(37)				(37)
Subsidiary equity transactions	547		130				417
Distributions to noncontrolling interest owners	(112)						(112)
Contributions from noncontrolling interest owners	16						16
Reclassification of previously deferred derivative losses to (gains) losses on derivatives, net	8					8
Adjustments for pension and other postretirement plans	(36)					(36)
Balance at Dec. 31, 2012	21,882	51	8,230	13,829	(841)	(640)	1,253
Net income (loss)	941			801			140
Common stock issued	293	1	292
Dividends—common stock	(274)			(274)
Repurchase of common stock	(54)				(54)
Subsidiary equity transactions	661		107				554
Distributions to noncontrolling interest owners	(156)						(156)
Contributions from noncontrolling interest owners	2						2
Reclassification of previously deferred derivative losses to (gains) losses on derivatives, net	7					7
Adjustments for pension and other postretirement plans	348					348
Balance at Dec. 31, 2013	23,650	52	8,629	14,356	(895)	(285)	1,793
Net income (loss)	(1,563)			(1,750)			187
Common stock issued	286		286
Dividends—common stock	(505)			(505)
Repurchase of common stock	(45)				(45)
Subsidiary equity transactions	943		90	24			829
Distributions to noncontrolling interest owners	(216)						(216)
Reclassification of previously deferred derivative losses to (gains) losses on derivatives, net	6					6
Adjustments for pension and other postretirement plans	(238)					(238)
Balance at Dec. 31, 2014	$ 22,318	$ 52	$ 9,005	$ 12,125	$ (940)	$ (517)	$ 2,593