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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2019
(Provision) Benefit for Income Taxes $ (32) $ (33)  
Income (loss) before income taxes $ (210) $ (410)  
Forecast      
Uncertain tax positions, estimated for next twelve months     $ 19