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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Operating Loss Carryforwards [Line Items]        
Effective tax rate (percent) 25.00% 33.50% 29.80% 28.20%
Charge from write-off of deferred tax assets     $ 3  
Tax benefits from resolution of tax examination       $ 6
Imagitas        
Operating Loss Carryforwards [Line Items]        
Disposition of Imagitas     $ 20