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Income Taxes (Income Tax Expense (Benefit)) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Abstract]      
U.S. $ (13) $ 194 $ (232)
International 29 24 20
Total $ 16 $ 218 $ (212)