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Income Taxes- Breakout of Provision (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current taxes:
U.S. federal	$ (4)	$ 1	$ 17
U.S. state	0	1	0
Deferred taxes:
U.S. federal	53	(479)	171
U.S. state	13	(34)	30
Total income tax provision (benefit)	$ 62	$ (511)	$ 218

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.