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Income Taxes - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
US federal statutory income tax rate   21.00% 35.00% 35.00%
Income tax expense   $ 48 $ 30  
Effective income tax rate   31.00% 29.00%  
Expense related to future taxes on repatriations from operations   $ 2 $ 2  
Withholding tax related to actual transfer of funds   $ 3 $ 2  
Maximum [Member] | Scenario, Forecast [Member]        
Possible release of valuation allowance $ 8