CONSOLIDATED STATEMENT OF EQUITY - 6 months ended Jun. 30, 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)	(1,609)					(1,726)			117
Common stock issued	109		1	108
Dividends—common stock	(51)					(51)
Repurchase of common stock	(31)						(31)
Subsidiary equity transactions		$ 988			$ 265					$ 723
Distributions to noncontrolling interest owners	(159)								(159)
Reclassification of previously deferred derivative losses to (gains) losses on derivatives, net	3							3
Adjustments for pension and other postretirement plans	(107)							(107)
Balance at Jun. 30, 2016	$ 14,600		$ 53	$ 9,638		$ 3,103	$ (1,026)	$ (487)	$ 3,319