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Student Loans - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Maximum repayment period of Stafford and PLUS Loans (in years) 10 years  
Minimum repayment period of Federal Family Education Loan Program consolidation loans (in years) 12 years  
Maximum repayment period of Federal Family Education Loan Program consolidation loans (in years) 30 years  
Percentage reimbursement on all qualifying FFELP default claims period one 98.00%  
Percentage reimbursement on all qualifying FFELP default claims period two 97.00%  
CP indexed loans   $ 128,000,000,000
Repayment terms of most (Private) student loans 15 years or more  
Estimated weighted average life of student loans 7 years 6 months 0 days 8 years
Percentage of student loan portfolio in repayment 76.00% 75.00%
Assets 159,543,000,000 181,260,000,000
Liabilities 153,901,000,000 176,194,000,000
Interest rate reduction, description Once the customer has made the initial three payments, the loan's status is returned to current and the interest rate is reduced for the successive twelve month period  
Deconsolidation [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Assets 12,500,000,000  
Liabilities 12,100,000,000  
Gain from trust sale $ 312,000,000  
Minimum [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Repayment period of Stafford and PLUS Loans (in years) 5 years