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Income Taxes Pretax Income (Loss) for Domestic and Foreign Operations Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Gains (Losses) on Extinguishment of Debt $ (12) $ (19) $ (3)