CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 223		$ 142		$ 1,666		$ 2,255
Other Comprehensive Income (Loss), net of taxes
Reclassification of previously deferred derivative losses to (gains) losses on derivatives, net (1)	2	[1]	2	[1]	5	[1]	6	[1]
Adjustments for pension and other postretirement plans
Amortization of net actuarial (gain) loss to general and administrative expense (2)	18	[2]	15	[2]	56	[2]	44	[2]
Amortization of net prior service (credit) cost to general and administrative expense	1		0		1		1
Total adjustments for pension and other postretirement plans	19		15		57		45
Total	21		17		62		51
Comprehensive Income (Loss)	244		159		1,728		2,306
Comprehensive income attributable to noncontrolling interests	41		21		95		67
Comprehensive Income (Loss) Attributable to Common Stockholders	$ 203		$ 138		$ 1,633		$ 2,239

[1] Net of income tax benefit (expense) of $(1) million for the three months ended September 30, 2013, $(1) million for the three months ended September 30, 2012, $(3) million for the nine months ended September 30, 2013, and $(3) million for the nine months ended September 30, 2012.

[2] Net of income tax benefit (expense) of $(11) million for the three months ended September 30, 2013, $(8) million for the three months ended September 30, 2012, $(32) million for the nine months ended September 30, 2013, and $(25) million for the nine months ended September 30, 2012.