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Income Taxes (Income Tax Expense) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Tax Disclosure [Abstract]
Income tax expense (benefit) from continuing operations	$ 40	$ (16)	$ (83)	$ (15)
Valuation Allowance, Deferred Tax Asset, Change in Amount	$ 87		$ 298

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

The amount of the change in the period in the valuation allowance for a specified deferred tax asset.