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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Income Tax Expense (Benefit) [Abstract]    
Compensation expense $ 6 $ 4
Income tax benefit (2) (1)
Total 4 $ 3
Unrecognized compensation cost $ 79  
Compensation cost not yet recognized, period for recognition 2 years 4 months 2 days  
Stock Incentive Plan and Omnibus Plan | Equity Option    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grants in period, net of forfeitures 794,149  
Weighted average grant date fair value (in dollars per share) $ 3.99  
Stock Incentive Plan and Omnibus Plan | Equity Option | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 3 years  
Stock Incentive Plan and Omnibus Plan | Equity Option | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 5 years  
Stock Incentive Plan and Omnibus Plan | Restricted Stock Units (RSUs)    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grants in period, net of forfeitures 1,135,343  
Weighted average grant date fair value (in dollars per share) $ 9.99  
Stock Incentive Plan and Omnibus Plan | Performance Shares    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grants in period, net of forfeitures 2,365,670  
Weighted average grant date fair value (in dollars per share) $ 9.98