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Share-Based Compensation (Narrative) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Stock Options
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option grant price as percent of market price 100.00%    
Award vesting period 3 years    
Award vesting rights percentage 33.00%    
Stock option contractual term 10 years    
Number of shares available for grant 15    
Implied volatility rate, minimum maturities of traded options 1 year    
Compensation cost not yet recognized $ 3    
Compensation cost not yet recognized, period for recognition 1 year 9 months 18 days    
Estimated forfeiture rate 25.50%    
Cost not yet recognized related to current year grants 2.4    
Compensation cost not yet recognized related to current year grants per year 0.8    
RSUs
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Award vesting rights percentage 33.00%    
Compensation cost not yet recognized 13    
Compensation cost not yet recognized, period for recognition 1 year 8 months 12 days    
Estimated forfeiture rate 24.18%    
Compensation cost not yet recognized related to current year grants per year 12.0    
Period before award can be converted to shares 2 years    
Grant date fair value (in dollars per share) $ 11.19 $ 13.54 $ 12.65
PSUs
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost not yet recognized 7    
Compensation cost not yet recognized, period for recognition 1 year 9 months 18 days    
Estimated forfeiture rate 25.50%    
Cost not yet recognized related to current year grants 6.0    
Compensation cost not yet recognized related to current year grants per year 2.0    
Grant date fair value (in dollars per share) $ 12.23    
PSUs | Minimum
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award payout range 0.00%    
PSUs | Maximum
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award payout range 200.00%    
PSUs With Market Conditions
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant date fair value (in dollars per share) $ 13.28 $ 19.75 $ 17.68
Award, percent with market condition 50.00%    
Performance stock units vesting rule measurement period 3 years    
Grants in period, weighted average grant date fair value percent of stock price 119.00%    
Decrease in grant date fair value if market condition not applied $ 1    
PSUs with Performance Condition
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant date fair value (in dollars per share) $ 11.17    
Award, percent with performance condition 50.00%    
Performance stock units vesting rule measurement period 3 years