STATEMENT OF CONSOLIDATED COMPREHENSIVE INCOME (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Statement Of Income And Comprehensive Income [Abstract]
NET INCOME INCLUDING NONCONTROLLING INTEREST	$ 334	$ 717
Commodity cash flow hedge activity, net of tax:
Reclassification of loss on settled derivative instruments		6
Change in fair value of derivative instruments	(1)	(8)
Commodity cash flow hedge activity, net of tax	(1)	(2)
COMPREHENSIVE INCOME INCLUDING NONCONTROLLING INTEREST	333	715
Preferred stock dividends		19
Comprehensive income attributable to noncontrolling interest	98
COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON STOCK	$ 235	$ 696