CONSOLIDATED STATEMENT OF EQUITY - 6 months ended Jun. 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)	(3,128)			(3,207)			79
Common stock issued	105		105
Dividends—common stock	(277)			(277)
Repurchase of common stock	(37)				(37)
Subsidiary equity transactions								$ 144	$ 59	$ 85	$ 348	$ 348
Distributions to noncontrolling interest owners	(135)						(135)
Reclassification of previously deferred derivative losses to (gains) losses on derivatives, net	3					3
Adjustments for pension and other postretirement plans	18					18
Balance at Jun. 30, 2015	$ 19,359	$ 52	$ 9,169	$ 8,641	$ (977)	$ (496)	$ 2,970