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Income Taxes - Income from Continuing Operations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
(Loss) Income Before Income Taxes [Abstract]      
United States $ (25) $ (262) $ 149
Foreign 366 301 333
Income (loss) from continuing operations before income taxes $ 341 $ 39 $ 482