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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Effective tax rate (percent) 9.20% 35.80% 24.20% 36.50%  
Charge from valuation allowance for tax carryovers $ 4 $ 3 $ 4 $ 3  
Tax benefit from resolution of settlement $ 10   $ 14    
Scenario, Forecast          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Percent decrease in unrecognized benefits, reasonably possible (up to)         15.00%