CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 484		$ 2,183
Other Comprehensive Income (Loss), net of taxes
Reclassification of previously deferred derivative losses to (gains) losses on derivatives, net	2	[1]	2	[1]
Amortization of net actuarial (gain) loss to general and administrative expense	19	[2]	15	[2]
Total	21		17
Comprehensive Income (Loss)	505		2,200
Comprehensive income attributable to noncontrolling interests	24		27
Comprehensive Income (Loss) Attributable to Common Stockholders	$ 481		$ 2,173

[1] Net of income tax benefit (expense) of $(1) million for the three months ended March 31, 2013 and 2012.

[2] Net of income tax benefit (expense) of $(10) million for the three months ended March 31, 2013, and $(8) million for the three months ended March 31, 2012.