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Income Taxes Level 4 (Details) - Domestic and Foreign Components of Income Continuing Operations - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Examination [Line Items]      
Domestic $ (195) $ (143) $ (115)
Foreign 69 (77) 104
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest $ (126) $ (220) $ (11)