CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 266		$ 959		$ (2,360)		$ 1,443
Other Comprehensive Income (Loss), net of taxes
Reclassification of previously deferred derivative losses to (gains) losses on derivatives, net (1)	2	[1]	1	[1]	3	[1]	3	[1]
Amortization of net actuarial (gain) loss to general and administrative expense (2)	4	[2]	19	[2]	9	[2]	38	[2]
Total	6		20		12		41
Comprehensive Income (Loss)	272		979		(2,348)		1,484
Comprehensive income attributable to noncontrolling interests	39		30		82		54
Comprehensive Income (Loss) Attributable to Common Stockholders	$ 233		$ 949		$ (2,430)		$ 1,430

[1] Net of income tax benefit (expense) of $(1) million for the three months ended June 30, 2014 and 2013, and $(2) million for the six months ended June 30, 2014 and 2013.

[2] Net of income tax benefit (expense) of $(3) million for the three months ended June 30, 2014, $(11) million for the three months ended June 30, 2013, $(5) million for the six months ended June 30, 2014, and $(21) million for the six months ended June 30, 2013.