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Income Taxes (Income Tax Expense) (Details) (USD $)	3 Months Ended
Income Taxes (Income Tax Expense) (Details) (USD $)	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012 Domestic Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Capital Loss Carryforwards			$ 2,200,000,000
Income tax expense (benefit) from continuing operations	(123,000,000)	1,000,000
Valuation Allowance, Deferred Tax Asset, Change in Amount	$ 230,000,000

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible capital loss carryforwards.

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.