Statement of Consolidated Comprehensive Income (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income (loss) including noncontrolling interest	$ (1,241)	$ 306	$ (294)	$ 2,058
Commodity cash flow hedge activity, net of tax:
Reclassification of loss on settled derivative instruments		(1)		13
Change in fair value of derivative instruments		(5)	(1)	(6)
Derivative hedge ineffectiveness reclassified into earnings		1	0	1
Commodity cash flow hedge activity, net of tax		(5)	(1)	8
COMPREHENSIVE INCOME (LOSS) INCLUDING NONCONTROLLING INTEREST	(1,241)	301	(295)	2,066
Preferred stock dividends		6		44
Comprehensive income attributable to noncontrolling interest	89		295
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCK	$ (1,330)	$ 295	$ (590)	$ 2,022