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SUBSEQUENT EVENTS (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Apr. 21, 2016
Apr. 07, 2016
Mar. 31, 2016
Mar. 31, 2015
Subsequent Event        
Subsequent Event [Line Items]        
Dividends declared and paid (in Dollars per Share) $ 0.12      
Dividends to common stockholders $ 64      
Student loan        
Subsequent Event [Line Items]        
Loans purchased during period     $ 369 $ 261
Student loan | Subsequent Event        
Subsequent Event [Line Items]        
Loans purchased during period   $ 348