CONSOLIDATED STATEMENT OF EQUITY - 9 months ended Sep. 30, 2015 - 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]	Subsidiary Equity Transactions [Member]	Subsidiary Equity Transactions [Member] Paid-in Capital [Member]	Subsidiary Equity Transactions [Member] Noncontrolling Interests [Member]	7.50% Tangible Equity Units [Member]	7.50% Tangible Equity Units [Member] Noncontrolling Interests [Member]
Balance at Dec. 31, 2014	$ 22,318	$ 52	$ 9,005	$ 12,125	$ (940)	$ (517)	$ 2,593
Net income (loss)	(5,288)			(5,442)			154
Common stock issued	154		154
Dividends—common stock	(415)			(415)
Repurchase of common stock	(38)				(38)
Subsidiary equity transactions								$ 151	$ 65	$ 86	$ 348	$ 348
Distributions to noncontrolling interest owners	(208)						(208)
Reclassification of previously deferred derivative losses to (gains) losses on derivatives, net	4					4
Adjustments for pension and other postretirement plans	26					26
Balance at Sep. 30, 2015	$ 17,052	$ 52	$ 9,224	$ 6,268	$ (978)	$ (487)	$ 2,973