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Income Taxes - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jan. 18, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Income Tax Contingency [Line Items]          
Effective income tax rate   14.00% 18.00% 24.00% 20.00%
Increase in unrecognized tax benefits       $ 1  
Amount awarded $ 15        
Internal Revenue Service          
Income Tax Contingency [Line Items]          
Income taxes paid       11  
Interest payment   $ 4   $ 4