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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Effective tax rate on income from operations (percentage) 27.00% 20.00%  
Effective income tax rate, estimated (percentage) 26.00%    
Deferred tax assets, valuation allowance $ 204   $ 207
Change in valuation allowance (3) $ (1)  
Liabilities for uncertain tax positions $ 90   $ 90