CONSOLIDATED STATEMENT OF EQUITY - 3 months ended Mar. 31, 2016 - USD ($) $ in Millions	Total	Subsidiary Equity Transactions [Member]	Common Stock [Member]	Paid-in Capital [Member]	Paid-in Capital [Member] Subsidiary Equity Transactions [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interests [Member]	Noncontrolling Interests [Member] Subsidiary Equity Transactions [Member]
Balance at Dec. 31, 2015	$ 15,457		$ 52	$ 9,265		$ 4,880	$ (995)	$ (383)	$ 2,638
Net income (loss)	(998)					(1,034)			36
Common stock issued	63		1	62
Dividends—common stock	(25)					(25)
Repurchase of common stock	(30)						(30)
Subsidiary equity transactions		$ 420			$ 1					$ 419
Distributions to noncontrolling interest owners	(78)								(78)
Reclassification of previously deferred derivative losses to (gains) losses on derivatives, net	2							2
Adjustments for pension and other postretirement plans	(110)							(110)
Balance at Mar. 31, 2016	$ 14,701		$ 53	$ 9,328		$ 3,821	$ (1,025)	$ (491)	$ 3,015