XML 35 R46.htm IDEA: XBRL DOCUMENT v2.4.0.8
Allowance for Loan Losses - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
CreditScore
Dec. 31, 2012
Dec. 31, 2011
Schedule Of Allowance For Credit Losses And Recorded Investment In Financing Receivables [Line Items]      
Maximum original FICO score at for-profit schools to become eligible for non-traditional loans 670    
Maximum original FICO score at not-for-profit schools to become eligible for non-traditional loans 640    
Delinquency period (in days) 212 days    
Allowance for estimated recovery shortfalls $ 336 $ 198 $ 148
TDR loans, unpaid principal balance 8,986 7,377  
Percentage of loans granted forbearance that migrated to TDR classification 45.00% 43.00%  
Payment default period for TDRs 60 days past due    
Criteria for loans to be considered as nonperforming Greater than 90 days past due    
Interest Rate Reduction [Member]
      
Schedule Of Allowance For Credit Losses And Recorded Investment In Financing Receivables [Line Items]      
TDR loans, unpaid principal balance $ 1,500 $ 1,000  
Private Education Loans [Member]
      
Schedule Of Allowance For Credit Losses And Recorded Investment In Financing Receivables [Line Items]      
Number of classes of loans 2