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Income Taxes - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jan. 18, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Tax Contingency [Line Items]          
Effective income tax rate   17.00% 19.00% 21.00% 19.00%
Unrecognized Tax Benefits   $ 1   $ 1  
Amount awarded $ 15        
Internal Revenue Service          
Income Tax Contingency [Line Items]          
Income taxes paid   11      
Interest payment   $ 4   $ 4