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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]      
United States $ 71 $ 14 $ 29
Other nations 30 67 234
States (U.S.) 13 11 12
Current income tax expense 114 92 275
United States 154 (503) (368)
Other nations (13) (11) 35
States (U.S.) 19 (43) (1)
Deferred income tax expense (benefit) 160 (557) (334)
Total income tax expense (benefit) $ 274 $ (465) $ (59)