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Income Taxes (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 06, 2020
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Valuation Allowance [Line Items]            
Effective income tax expense (benefit) rate   2.00% 17.00%   2.00% (52.00%)
Tax benefit from settlement       $ 126    
Tax benefit from internal restructuring       $ 18    
Effective income tax expense (benefit) rate, excluding discrete items           13.00%
Proceeds from income tax refunds         $ 4 $ 89
Subsequent Event            
Valuation Allowance [Line Items]            
Proceeds from income tax refunds $ 89