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Allowance for Loan Losses - Age Analysis of Past Due Loans Delinquencies (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Loans in repayment and percentage of each status:        
Loans allowance for losses $ (2,244) $ (2,377) $ (2,427) $ (2,283)
Loans, net 142,100 162,546    
FFELP Loans [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans in-school/grace/deferment 13,678 17,702 22,887  
Loans in forbearance 13,490 15,902 19,575  
Loans in repayment and percentage of each status:        
Loans current 63,330 75,499 77,093  
Loans delinquent 31-60 days 3,746 4,710 5,419  
Loans delinquent 61-90 days 2,207 2,788 3,438  
Loans delinquent greater than 90 days 7,221 7,734 8,231  
Total loans in repayment 76,504 90,731 94,181  
Total loans, gross 103,672 124,335 136,643  
Loans unamortized premium (discount) 1,035 1,436 1,674  
Total loans 104,707 125,771 138,317  
Loans allowance for losses (119) (159) (187)  
Loans, net 104,588 125,612 138,130  
Loans current, in percentage 82.80% 83.20% 81.90%  
Loans delinquent 31-60 days, in percentage 4.90% 5.20% 5.80%  
Loans delinquent 61-90 days, in percentage 2.90% 3.10% 3.70%  
Loans delinquent greater than 90 days, in percentage 9.40% 8.50% 8.60%  
Total loans in repayment, in percentage 100.00% 100.00% 100.00%  
Percentage of loans in repayment 73.80% 73.00% 68.90%  
Delinquencies as a percentage of loans in repayment 17.20% 16.80% 18.10%  
Loans in forbearance as a percentage of loans in repayment and forbearance 15.00% 14.90% 17.20%  
Private Education Traditional Loan [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans in-school/grace/deferment 6,088 5,421 5,866  
Loans in forbearance 969 996 1,195  
Loans in repayment and percentage of each status:        
Loans current 26,977 26,597 25,110  
Loans delinquent 31-60 days 674 837 868  
Loans delinquent 61-90 days 420 375 393  
Loans delinquent greater than 90 days 1,012 1,121 1,096  
Total loans in repayment 29,083 28,930 27,467  
Total loans, gross 36,140 35,347 34,528  
Loans unamortized premium (discount) (629) (713) (792)  
Total loans 35,511 34,634 33,736  
Loans receivable for partially charged-off loans 799 797 705  
Loans allowance for losses (1,592) (1,637) (1,542)  
Loans, net 34,718 33,794 32,899  
Loans current, in percentage 92.80% 91.90% 91.40%  
Loans delinquent 31-60 days, in percentage 2.30% 2.90% 3.20%  
Loans delinquent 61-90 days, in percentage 1.40% 1.30% 1.40%  
Loans delinquent greater than 90 days, in percentage 3.50% 3.90% 4.00%  
Total loans in repayment, in percentage 100.00% 100.00% 100.00%  
Percentage of loans in repayment 80.50% 81.90% 80.00%  
Delinquencies as a percentage of loans in repayment 7.20% 8.10% 8.60%  
Loans in forbearance as a percentage of loans in repayment and forbearance 3.20% 3.30% 4.20%  
Private Education Non-Traditional Loan [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans in-school/grace/deferment 440 483 656  
Loans in forbearance 133 140 191  
Loans in repayment and percentage of each status:        
Loans current 1,791 1,978 2,012  
Loans delinquent 31-60 days 128 175 208  
Loans delinquent 61-90 days 93 106 127  
Loans delinquent greater than 90 days 275 325 371  
Total loans in repayment 2,287 2,584 2,718  
Total loans, gross 2,860 3,207 3,565  
Loans unamortized premium (discount) (75) (83) (81)  
Total loans 2,785 3,124 3,484  
Loans receivable for partially charged-off loans 514 550 536  
Loans allowance for losses (505) (534) (629)  
Loans, net 2,794 3,140 3,391  
Loans current, in percentage 78.30% 76.50% 74.00%  
Loans delinquent 31-60 days, in percentage 5.60% 6.80% 7.70%  
Loans delinquent 61-90 days, in percentage 4.10% 4.10% 4.70%  
Loans delinquent greater than 90 days, in percentage 12.00% 12.60% 13.60%  
Total loans in repayment, in percentage 100.00% 100.00% 100.00%  
Percentage of loans in repayment 80.00% 80.60% 76.20%  
Delinquencies as a percentage of loans in repayment 21.70% 23.40% 26.00%  
Loans in forbearance as a percentage of loans in repayment and forbearance 5.50% 5.10% 6.60%  
Troubled Debt Restructuring Loans [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans in-school/grace/deferment 913 574 285  
Loans in forbearance 740 544 696  
Loans in repayment and percentage of each status:        
Loans current 5,613 4,619 3,018  
Loans delinquent 31-60 days 469 478 427  
Loans delinquent 61-90 days 330 254 215  
Loans delinquent greater than 90 days 921 908 672  
Total loans in repayment 7,333 6,259 4,332  
Total loans, gross $ 8,986 $ 7,377 $ 5,313  
Loans current, in percentage 76.50% 73.80% 69.70%  
Loans delinquent 31-60 days, in percentage 6.40% 7.60% 9.80%  
Loans delinquent 61-90 days, in percentage 4.50% 4.10% 5.00%  
Loans delinquent greater than 90 days, in percentage 12.60% 14.50% 15.50%  
Total loans in repayment, in percentage 100.00% 100.00% 100.00%