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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Income Taxes (Textuals) [Abstract]          
Tax expense $ 54 $ 53 $ 136 $ 164  
Income before income taxes 249 186 555 408  
Tax impact due to law change   4 (5)    
Tax contingencies recognized       10  
Unrecognized tax benefits         82
Favorable impact of unrecognized tax benefits if recognized         70
Accrued interest         20
Unsettled unrecognized tax benefits that would require cash         $ 24