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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Effective Tax Rate    
Income/(Loss) before income taxes $ 232 $ (173)
Income tax benefit $ (1) $ (4)
Effective tax rate (0.40%) 2.30%
Uncertain Tax Benefits    
Non-current tax liability for uncertain tax benefits $ 35  
Unrecognized tax benefits, penalties and interest accrued $ 3