Statement of Consolidated Changes in Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock [Member]	Paid-In Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Parent [Member]	Noncontrolling Interest [Member]
BALANCE at Dec. 31, 2013	$ 35,393	$ 255	$ 12,251	$ 22,032	$ (1,027)	$ (115)	$ 33,396	$ 1,997
Net income (loss)	947			741			741	206
Distributions to noncontrolling interest	(66)							(66)
Commodity hedges, net of tax	(1)					(1)	(1)
Common dividends ($0.50 per share)	(192)			(192)			(192)
Common stock activity, net	(24)	1	(25)				(24)
Treasury stock activity, net	(1,264)		(1)		(1,263)		(1,264)
Compensation expense	99		99				99
BALANCE at Jun. 30, 2014	34,892	256	12,324	22,581	(2,290)	(116)	32,755	2,137
BALANCE at Dec. 31, 2014	28,137	256	12,438	16,249	(2,890)	(116)	25,937	2,200
Net income (loss)	(10,200)			(10,251)			(10,251)	51
Distributions to noncontrolling interest	(40)							(40)
Common dividends ($0.50 per share)	(189)			(189)			(189)
Other	47	1	45		1		47
BALANCE at Jun. 30, 2015	$ 17,755	$ 257	$ 12,483	$ 5,809	$ (2,889)	$ (116)	$ 15,544	$ 2,211