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Private Education Loan Term Securitization (Details) - USD ($)
$ in Millions
Jul. 30, 2015
Apr. 23, 2015
Sep. 30, 2015
Private Education Loans      
Line of Credit Facility [Line Items]      
Outstanding amount of asset-backed loan $ 714    
Loans pledged as collateral     $ 692
Sale of Private Education Loans 631 $ 738  
Gross proceeds on securitization $ 623    
Gain on sale of loans, net of costs and adjustments   $ 77  
Percentage of premium on loan sale   10.40%  
Class A and B Notes      
Line of Credit Facility [Line Items]      
Ownership interest as a percentage 5.00%    
Class C Notes      
Line of Credit Facility [Line Items]      
Ownership interest as a percentage 100.00%