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Subsequent Event (Details) - USD ($)
$ in Millions
Jul. 13, 2016
May 26, 2016
Private Education Loans    
Subsequent Event [Line Items]    
Total loan amount securitized at inception for the 2016 on-balance sheet term securitization   $ 551
Proceeds from loan securitization sold to third parties   $ 501
Private Education Loans | Subsequent Event    
Subsequent Event [Line Items]    
Total loan amount securitized at inception for the 2016 on-balance sheet term securitization $ 657  
Proceeds from loan securitization sold to third parties 605  
AAA Rated Notes | Subsequent Event    
Subsequent Event [Line Items]    
Amount of loan securitization sold to third parties $ 607  
Class B Notes    
Subsequent Event [Line Items]    
Ownership interest percentage   100.00%
Class B Notes | Subsequent Event    
Subsequent Event [Line Items]    
Ownership interest percentage 100.00%