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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Jun. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Effective tax rate (percent) 24.80% 31.30%   32.70% 30.20%  
Tax benefit from resolution of settlement $ 15     $ 15    
Charge from valuation allowance for tax carryovers $ 5     $ 5    
Imagitas            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Tax benefit from disposition     $ 20      
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)           25.00%