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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, 2012
Dec. 31, 2011
Dec. 31, 2010
Current:      
Federal $ 16 $ 2 $ (20)
State and local 1 0 0
Current Income Tax Expense (Benefit) 17 2 (20)
Deferred:      
Federal 30 43 61
State and local 17 13 12
deferred income tax expense 47 56 73
Income tax expense $ 64 $ 58 $ 53