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Income Taxes (Details 1) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Current taxes:      
Federal $ 146 $ 186 $ 214
State 6 4 4
Foreign 0 0 (1)
Deferred taxes:      
Federal (17) 22 65
Foreign 0 27 (14)
Provision for income taxes as shown on the Statement of Earnings $ 135 $ 239 $ 268