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Income Taxes (Income Tax Expense (Benefit)) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
U.S. $ 133 $ 942 $ (13)
International 26 26 29
Total $ 159 $ 968 $ 16