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Income Taxes - Income from Continuing Operations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
(Loss) Income Before Income Taxes [Abstract]      
United States $ (24) $ (235) $ 29
Foreign (71) 372 525
(Loss) income from continuing operations before income taxes $ (95) $ 137 $ 554