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Segment Reporting - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2013
Agency
Segment
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Minimum [Member]
Dec. 31, 2013
Maximum [Member]
Dec. 31, 2013
Sallie Mae Bank [Member]
Dec. 31, 2013
Business Services [Member]
Dec. 31, 2012
Business Services [Member]
Dec. 31, 2011
Business Services [Member]
Dec. 31, 2013
Operating Segments [Member]
Business Services [Member]
CollectionOperation
Dec. 31, 2013
Operating Segments [Member]
Business Services [Member]
Accounts
CollectionOperation
Dec. 31, 2012
Operating Segments [Member]
Business Services [Member]
Dec. 31, 2011
Operating Segments [Member]
Business Services [Member]
Dec. 31, 2013
Operating Segments [Member]
Consumer Lending [Member]
Dec. 31, 2012
Operating Segments [Member]
Consumer Lending [Member]
Dec. 31, 2011
Operating Segments [Member]
Consumer Lending [Member]
Dec. 31, 2013
Operating Segments [Member]
FFELP Loans [Member]
Dec. 31, 2012
Operating Segments [Member]
FFELP Loans [Member]
Dec. 31, 2011
Operating Segments [Member]
FFELP Loans [Member]
Dec. 31, 2013
Operating Segments [Member]
Other Segment [Member]
Dec. 31, 2012
Operating Segments [Member]
Other Segment [Member]
Dec. 31, 2011
Operating Segments [Member]
Other Segment [Member]
Dec. 31, 2013
Deconsolidation [Member]
Segment Reporting Information [Line Items]                                                
Number of primary operating segments   3                                            
Private Education Loan originations                             $ 3,800,000,000                  
Percentage increase of Private Education Loan originations                               14.00% 39.00%              
Private Education Loans, net   37,512,000,000 36,934,000,000                       37,500,000,000 36,900,000,000 36,300,000,000              
Charge-offs as percentage of average loans in repayment                             2.80% 3.40%                
Total assets of Sallie Mae Bank             10,700,000,000                                  
Total deposits of Sallie Mae Bank             9,200,000,000                                  
Total Private Education Loans of SLM Bank             6,700,000,000                                  
FFELP Loans   104,588,000,000 125,612,000,000       1,400,000,000                     104,588,000,000 125,612,000,000          
Intercompany loan servicing revenue on FFELP Loans   530,000,000 670,000,000                                          
Account maintenance fees and default aversion fees earned on FFELP loans                       38,000,000 44,000,000                      
Number of guarantor agencies   30                                            
Default aversion provided   15                                            
Contingency collection revenue from guarantor clients                       303,000,000 264,000,000                      
Fee income on FFELP default collections   283,000,000                                            
FFELP-related revenue as percentage of Business Services revenue               77.00% 82.00% 82.00%                            
Business Services segment revenue   886,000,000 244,000,000 (271,000,000)       1,160,000,000 1,200,000,000     1,164,000,000 1,202,000,000 1,274,000,000 34,000,000 46,000,000 55,000,000 388,000,000 90,000,000 86,000,000 42,000,000 160,000,000 58,000,000  
Number of other collection providers to ED                     21 21                        
Number of competitive ED collection providers for account allocation                     16 16                        
Number of small business collection providers to ED issued allocation                     5 5                        
Share of allocated accounts of ED collection contract         6.00% 8.00%                                    
Span of ED servicing contract   5 years                                            
Renewal option   5 years                                            
Maximum percentage of loans serviced for ED in contract year                       40.00%                        
Percentage of new loans serviced under ED Servicing Contract                     18.00% 18.00% 15.00%                      
Revenue from servicing contract                       109,000,000                        
Number of contracts under ED servicing contract                       5,700,000                        
Assets   159,543,000,000 181,260,000,000               892,000,000 892,000,000 867,000,000   43,001,000,000 42,940,000,000   112,648,000,000 135,664,000,000   3,000,000,000 1,800,000,000   12,500,000,000
College savings rewards on which company earns transaction fees   800,000,000                                            
After-tax gain on sale of business 38,000,000 38,000,000                 65,000,000 65,000,000                        
Percentage of general guarantees of FFELP loans                       97.00%                        
Percentage of guarantee on FFELP Loan principal and interest if death, disability or bankruptcy                       100.00%                        
Liabilities   153,901,000,000 176,194,000,000                                         12,100,000,000
Gain from trust sale                                               $ 312,000,000
FFELP loan portfolio amortization period   20 years                               20 years