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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Effective Tax Rate    
(Loss)/Income before income taxes $ (167) $ 144
Income tax (benefit)/expense $ (85) $ 23
Effective income tax rate 50.90% 16.00%
Uncertain Tax Benefits    
Non-current tax liability for uncertain tax benefits $ 23  
Uncertain tax benefits, penalties and interest accrued $ 2