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Share-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2010
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
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   16    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   $ 1    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition   1 year    
RSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period   3 years    
Award vesting rights percentage   33.00%    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   $ 17    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition   1 year 9 months 18 days    
Estimated forfeiture rate   11.54%    
Compensation cost not yet recognized related to current year grants per year   $ 16    
Period before award can be converted to shares 2 years      
Weighted Average Grant Date Fair Value   $ 9.42 $ 12.03 $ 14.60
PSUs With Market Conditions        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award, percent with market condition   50.00%    
Weighted Average Grant Date Fair Value   $ 9.41 $ 8.22 $ 15.19
PSUs with Performance Condition        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award, percent with performance condition   50.00%    
Performance stock units vesting rule measurement period   3 years    
Performance Cash Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Cost not yet recognized related to current year grants   $ 7    
Compensation cost not yet recognized related to current year grants per year   $ 2    
Performance stock units vesting rule measurement period   3 years    
Weighted Average Grant Date Fair Value   $ 1.04    
PSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   $ 7    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition   1 year 9 months 18 days    
Estimated forfeiture rate   12.28%    
Cost not yet recognized related to current year grants   $ 6    
Period of straight-line expense, 2015 PSUs   3 years    
Compensation cost not yet recognized related to current year grants per year   $ 2    
Weighted Average Grant Date Fair Value   $ 9.41    
PSUs | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award payout range     0.00% 0.00%
PSUs | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award payout range   100.00% 200.00% 200.00%