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Income Taxes - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Jan. 01, 2017
Income tax expense   $ 33 $ 13 $ 94 $ 66  
Effective income tax rate       31.00% 29.00%  
US federal statutory income tax rate       35.00% 35.00%  
Amortization of prepaid tax asset         $ 8  
Write-off of prepaid tax asset at beginning of 2017           $ 179
Expense related to future taxes on repatriations from operations   5 1 $ 9 5  
Withholding tax related to actual transfer of funds   $ 1 $ 2 $ 5 $ 4  
New Accounting Pronouncement, Early Adoption, Effect [Member]            
Write-off of prepaid tax asset at beginning of 2017           $ 179
Maximum [Member] | Scenario, Forecast [Member]            
Possible release of valuation allowance $ 12