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Share Repurchases (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Feb. 25, 2014
Equity, Class of Treasury Stock [Line Items]          
Number of shares repurchased under the authorization 15,608 257,868 161,153 1,376,688  
Treasury Stock Acquired, Average Cost Per Share $ 13.76 $ 16.94 $ 13.98 $ 15.77  
Stock Repurchased During Period, Value $ 0 $ 4 $ 2 $ 22  
Share Repurchase Program Twenty Fourteen [Member]          
Equity, Class of Treasury Stock [Line Items]          
Stock Repurchase Program, Authorized Amount         $ 350
Number of shares repurchased under the authorization 0 250,000 0 746,440  
Treasury Stock Acquired, Average Cost Per Share   $ 16.92   $ 15.72  
Stock Repurchased During Period, Value $ 0 $ 4 $ 0 $ 12  
Share Maintenance Plan [Member]          
Equity, Class of Treasury Stock [Line Items]          
Number of shares repurchased under the authorization 0 0 0 466,974  
Treasury Stock Acquired, Average Cost Per Share       $ 15.43  
Stock Repurchased During Period, Value $ 0 $ 0 $ 0 $ 7  
Shares Withheld to Cover [Member]          
Equity, Class of Treasury Stock [Line Items]          
Number of shares repurchased under the authorization 15,608 7,868 161,153 163,274  
Treasury Stock Acquired, Average Cost Per Share $ 13.76 $ 17.85 $ 13.98 $ 16.97  
Stock Repurchased During Period, Value $ 0 $ 0 $ 2 $ 3