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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Income Tax Disclosure [Abstract]        
Effective tax rate (percent) 35.80% 25.00% 36.50% 29.80%
Charge from write-off of deferred tax assets     $ 3 $ 3
Imagitas        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Disposition of Imagitas   $ 20   $ 20