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Income Taxes - Income from Continuing Operations (Details) - USD ($)
$ in Millions
12 Months Ended 15 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
Income (loss) before income taxes        
U.S. $ 178 $ 27 $ 17 $ 194
Foreign 84 19 42  
Income from continuing operations before income taxes $ 262 $ 46 $ 59