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Stock-Based Compensation Plans (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for future grants 20,092,604    
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost (stock options less than $1 million) $ 13    
Weighted average recognition period 1 year 7 months 6 days    
Intrinsic value of units outstanding $ 36    
Intrinsic value of units vested 18 $ 18 $ 15
Fair value of units vested $ 14 $ 10 $ 18
Shares granted (in shares) 809,436 685,994 1,365,798
Issued weighted average fair value (in dollars per shares) $ 21.15 $ 23.62 $ 10.37
Restricted Stock Units | Directors' Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares granted (in shares) 12,824 34,344  
Vesting period 1 year    
Performance Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost (stock options less than $1 million) $ 14    
Weighted average recognition period 1 year 8 months 19 days    
Shares granted (in shares) 725,330 493,255  
Vesting period 3 years    
Performance Stock Units | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of target number of awards granted 0.00%    
Performance Stock Units | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of target number of awards granted 200.00%    
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost (stock options less than $1 million) $ 1    
Weighted average recognition period 2 years 9 months 18 days    
Expiration period 10 years    
Intrinsic value of options outstanding $ 3    
Intrinsic value of options exercisable $ 2    
Granted (in shares) 200,000 0 800,000
Granted (in dollars per share) $ 24.79 $ 0.00 $ 21.93
Stock Options | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Stock Options | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years    
Employee Stock Purchase Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee stock purchase plan discounted offering price of commons stock 95.00%    
Shares purchased under the Employee Stock Purchase Plan 131,769 87,606  
Shares reserved for future purchase under the ESPP 3,068,737