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Income Taxes Schedule of Components of Income Tax Expense (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Current: |  |  |
Federal | $ 2 | $ (20) | $ (46)
State and local | 0 | 0 | 0
Current Income Tax Expense (Benefit) | 2 | (20) | (46)
Deferred: |  |  |
Federal | 43 | 61 | 78
State and local | 13 | 12 | 6
deferred income tax expense | 56 | 73 | 84
Investment tax credit adjustments | 0 | 0 | (2)
Income tax expense | $ 58 | $ 53 | $ 36

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