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Share Repurchases (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Feb. 25, 2014
Equity, Class of Treasury Stock [Line Items]        
Stock Repurchased During Period, Value $ 62 $ 106 $ 7  
Number of shares repurchased under the authorization 3,642,625 4,041,078    
Treasury Stock Acquired, Average Cost Per Share $ 17.15 $ 26.15    
Share Repurchase Program Twenty Fourteen [Member]        
Equity, Class of Treasury Stock [Line Items]        
Stock Repurchased During Period, Value $ 52 $ 88    
Stock Repurchase Program, Authorized Amount       $ 350
Number of shares repurchased under the authorization 2,992,687 3,374,479    
Treasury Stock Acquired, Average Cost Per Share $ 17.43 $ 26.13    
Share Maintenance Plan [Member]        
Equity, Class of Treasury Stock [Line Items]        
Stock Repurchased During Period, Value $ 7 $ 16    
Number of shares repurchased under the authorization 466,974 593,042    
Treasury Stock Acquired, Average Cost Per Share $ 15.43 $ 26.07    
Shares Withheld to Cover [Member]        
Equity, Class of Treasury Stock [Line Items]        
Stock Repurchased During Period, Value $ 3 $ 2    
Number of shares repurchased under the authorization 182,964 73,557    
Treasury Stock Acquired, Average Cost Per Share $ 16.98 $ 27.69