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Income Taxes (Components of Income Tax Expense) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Components of Income Tax Expense (Benefit) [Abstract]      
Federal income tax expense (benefit) $ 74 $ 190 $ 27
State and other income tax expense (benefit) 16 49 21
Total current income taxes expense (benefit) 90 239 48
Federal deferred income tax expense (benefit) 122 39 318
State and other income tax deferred expense (benefit) 42 8 (98)
Total deferred income taxes exepense (benefit) 164 47 220
Income Tax Expense (Benefit) 254 286 268
Income tax expense (benefit) from Discontinued Operations 0 (29) (1)
Income Tax Expense (Benefit) including Discontinued Operations $ 254 $ 257 $ 267