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Significant Accounting Policies - Additional Information (Detail) (USD $)
 0 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended
May 29, 2013
Entity
Sep. 30, 2011
Dec. 31, 2013
Entity
Dec. 31, 2012
Dec. 31, 2013
Securitization Trust [Member]
Jun. 13, 2013
Securitization Trust [Member]
Apr. 11, 2013
Securitization Trust [Member]
Feb. 13, 2013
Securitization Trust [Member]
Dec. 31, 2013
Deconsolidation [Member]
Dec. 31, 2013
Minimum [Member]
Accounting Policies [Line Items]                    
Assets     $ 159,543,000,000 $ 181,260,000,000 $ 58,000,000 $ 6,600,000,000 $ 2,030,000,000 $ 3,820,000,000 $ 12,500,000,000  
Liabilities     153,901,000,000 176,194,000,000   6,420,000,000 1,990,000,000 3,680,000,000 12,100,000,000  
Gain from trust sale                 312,000,000  
Consolidation loan rebate fee     105 basis point              
Private Education Loan loss confirmation period (in years)     2 years              
Estimate of charge offs expected to occur     2 years              
Additional provision for loan losses   124,000,000                
Loans classified as troubled debt restructuring   $ 3,800,000,000                
Period until which customers are not required to begin repayment under certain Private Education Loans     Six months after they have graduated or otherwise left school              
Percentage of principal balance in higher education Private Education Loan portfolio related to customers who are in-school/grace/deferment status and not required to make payments     17.00%              
Number of days after last payment contractually due Private Education Loan considered to be delinquent     31 days              
Delinquency period (in days)     212 days              
Percentage reimbursement on all qualifying default claims period one     98.00%              
Percentage reimbursement on all qualifying default claims period two     97.00%              
Percentage reimbursement on all qualifying default claims period three     100.00%              
Option to exercise clean-up call and purchase student loans from trust of original loan balance     10 percent or less of the original loan balance              
Percentage of trust's asset balance needed to trigger clean-up call     10.00%              
Condition for purchase remaining loan from trust     Loan balance below 10%              
Probability percentage of impairment of goodwill                   50.00%
Minimum number of working hours for Severance Plan eligibility     24 hours              
Number of separate publicly traded entities 2   2              
Minimum settlement of tax position recognized     50.00%