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Borrowings - Additional Information (Detail) (USD $)
 1 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2013
Private Education Loans - Other Secured Borrowing Facilities [Member]
Jun. 13, 2013
Securitization Trust [Member]
ResidualInterest
Dec. 31, 2013
Securitization Trust [Member]
Apr. 11, 2013
Securitization Trust [Member]
Feb. 13, 2013
Securitization Trust [Member]
Dec. 31, 2013
Call Option [Member]
Long-Term Debt [Member]
Dec. 31, 2013
Private Education Loan Facility [Member]
Dec. 31, 2013
FFELP Loans [Member]
Dec. 31, 2013
FFELP Loans [Member]
Maximum [Member]
Dec. 31, 2013
FFELP Loans [Member]
Minimum [Member]
Dec. 31, 2013
Pre-Payable Debt [Member]
Long-Term Debt [Member]
Secured Borrowings [Member]
Dec. 31, 2013
Sallie Mae Bank [Member]
Debt [Line Items]                                
Outstanding long-term borrowings                   $ 1,700,000,000         $ 6,200,000,000  
Assets 159,543,000,000 181,260,000,000       6,600,000,000 58,000,000 2,030,000,000 3,820,000,000              
Liabilities 153,901,000,000 176,194,000,000       6,420,000,000   1,990,000,000 3,680,000,000              
Number of residual interest sold           3                    
Outstanding borrowings under facility         843,000,000             10,000,000,000        
Assets securing facility         1,600,000,000             10,400,000,000        
Facility maturity date                         2016-01 2014-06    
Maximum unused capacity                         10,600,000,000      
Unencumbered FFELP Loan                       2,700,000,000        
Maturity date of the facility                     Aug. 15, 2015          
Bank Deposits                               9,200,000,000
Brokered term deposits                               4,500,000,000
Retail Deposits of Sallie Mae Bank                               4,400,000,000
Deposits from Affiliates                               299,000,000
Cash and liquid investments 5,190,000,000 3,900,000,000 2,794,000,000 4,343,000,000                       2,200,000,000
Borrowing capacity with Federal Reserve Bank                               900,000,000
Outstanding borrowings                               0
Issuance of unsecured debt $ 3,750,000,000 $ 2,700,000,000 $ 2,000,000,000