CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 142		$ (3,028)		$ 2,255		$ (2,229)
Other Comprehensive Income (Loss), net of taxes
Reclassification of previously deferred derivative losses to net income	2	[1]	2	[1]	6	[1]	7	[1]
Amortization of net actuarial loss and prior service cost to net periodic benefit cost	15	[2]	14	[2]	45	[2]	41	[2]
Total	17		16		51		48
Comprehensive Income (Loss)	159		(3,012)		2,306		(2,181)
Comprehensive Income Attributable to Noncontrolling Interests	21		23		67		62
Comprehensive Income (Loss) Attributable to Common Stockholders	$ 138		$ (3,035)		$ 2,239		$ (2,243)

[1] Net of income tax benefit (expense) of $(1) million for the three months ended September 30, 2012 and 2011, and $(3) million and $(4) million for the nine months ended September 30, 2012 and 2011, respectively.

[2] Net of income tax benefit (expense) of $(8) million for the three months ended September 30, 2012 and 2011, and $(25) million and $(24) million for the nine months ended September 30, 2012 and 2011, respectively.