CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Statement of Other Comprehensive Income [Abstract]
Net Income (Loss)	$ 959		$ (70)		$ 1,443		$ 2,113
Other Comprehensive Income (Loss), net of taxes
Reclassification of previously deferred derivative losses to (gains) losses on derivatives, net (1)	1	[1]	2	[1]	3	[1]	4	[1]
Adjustments for pension and other postretirement plans
Amortization of net actuarial (gain) loss to general and administrative expense (2)	19	[2]	14	[2]	38	[2]	29	[2]
Amortization of net prior service (credit) cost to general and administrative expense			1				1
Total adjustments for pension and other postretirement plans	19		15		38		30
Total	20		17		41		34
Comprehensive Income (Loss)	979		(53)		1,484		2,147
Comprehensive income attributable to noncontrolling interests	30		19		54		46
Comprehensive Income (Loss) Attributable to Common Stockholders	$ 949		$ (72)		$ 1,430		$ 2,101

[1] Net of income tax benefit (expense) of $(1) million for the three months ended June 30, 2013, $(1) million for the three months ended June 30, 2012, $(2) million for the six months ended June 30, 2013, and $(2) million for the six months ended June 30, 2012.

[2] Net of income tax benefit (expense) of $(11) million for the three months ended June 30, 2013, $(9) million for the three months ended June 30, 2012, $(21) million for the six months ended June 30, 2013, and $(17) million for the six months ended June 30, 2012.