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Allowance for Loan Losses - Allowance for Credit Losses and Recorded Investments in Loans (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Allowance for Loan Losses                      
Beginning balance       $ 2,377       $ 2,427 $ 2,377 $ 2,427 $ 2,283
Total provision 190 207 201 241 314 270 243 253 839 1,080 1,295
Charge-offs                 (975) (1,151) (1,183)
Student loan sales                 (14) (8) (10)
Reclassification of interest reserve                 17 29 42
Ending balance 2,244       2,377       2,244 2,377 2,427
Allowance:                      
Ending balance: individually evaluated for impairment 1,068       1,161       1,068 1,161 813
Ending balance: collectively evaluated for impairment 1,176       1,216       1,176 1,216 1,614
Loans:                      
Ending balance: individually evaluated for impairment 9,307       7,629       9,307 7,629 5,406
Ending balance: collectively evaluated for impairment 134,808       156,792       134,808 156,792 170,834
FFELP Loans [Member]
                      
Allowance for Loan Losses                      
Beginning balance       159       187 159 187 189
Total provision                 52 72 86
Charge-offs                 (78) (92) (78)
Student loan sales                 (14) (8) (10)
Ending balance 119       159       119 159 187
Allowance:                      
Ending balance: collectively evaluated for impairment 119       159       119 159 187
Loans:                      
Ending balance: collectively evaluated for impairment 103,672       124,335       103,672 124,335 136,643
Charge-offs as a percentage of average loans in repayment                 0.10% 0.10% 0.08%
Charge-offs as a percentage of average loans in repayment and forbearance                 0.08% 0.08% 0.07%
Allowance as a percentage of the ending total loan balance                 0.12% 0.13% 0.14%
Allowance as a percentage of the ending loans in repayment                 0.16% 0.18% 0.20%
Allowance coverage of charge-offs                 1.5 1.7 2.4
Ending total loans 103,672       124,335       103,672 124,335 136,643
Average loans in repayment                 80,822 91,653 94,359
Ending loans in repayment 76,504       90,731       76,504 90,731 94,181
Private Education Loans [Member]
                      
Allowance for Loan Losses                      
Beginning balance       2,171       2,171 2,171 2,171 2,022
Total provision                 787 1,008 1,179
Charge-offs                 (878) (1,037) (1,072)
Reclassification of interest reserve                 17 29 42
Ending balance 2,097       2,171       2,097 2,171 2,171
Allowance:                      
Ending balance: individually evaluated for impairment 1,048       1,126       1,048 1,126 762
Ending balance: collectively evaluated for impairment 1,049       1,045       1,049 1,045 1,409
Loans:                      
Ending balance: individually evaluated for impairment 9,262       7,560       9,262 7,560 5,313
Ending balance: collectively evaluated for impairment 31,051       32,341       31,051 32,341 34,021
Charge-offs as a percentage of average loans in repayment                 2.78% 3.37% 3.72%
Charge-offs as a percentage of average loans in repayment and forbearance                 2.69% 3.24% 3.55%
Allowance as a percentage of the ending total loan balance                 5.20% 5.44% 5.52%
Allowance as a percentage of the ending loans in repayment                 6.68% 6.89% 7.19%
Allowance coverage of charge-offs                 2.4 2.1 2.0
Ending total loans 40,313       39,901       40,313 39,901 39,334
Average loans in repayment                 31,556 30,750 28,790
Ending loans in repayment 31,370       31,514       31,370 31,514 30,185
Other Loans [Member]
                      
Allowance for Loan Losses                      
Beginning balance       47       69 47 69 72
Total provision                     30
Charge-offs                 (19) (22) (33)
Ending balance 28       47       28 47 69
Allowance:                      
Ending balance: individually evaluated for impairment 20       35       20 35 51
Ending balance: collectively evaluated for impairment 8       12       8 12 18
Loans:                      
Ending balance: individually evaluated for impairment 45       69       45 69 93
Ending balance: collectively evaluated for impairment 85       116       85 116 170
Charge-offs as a percentage of average loans in repayment                 12.28% 9.51% 11.30%
Charge-offs as a percentage of average loans in repayment and forbearance                 12.28% 9.51% 11.30%
Allowance as a percentage of the ending total loan balance                 21.42% 25.39% 26.26%
Allowance as a percentage of the ending loans in repayment                 21.42% 25.39% 26.26%
Allowance coverage of charge-offs                 1.5 2.1 2.1
Ending total loans 130       185       130 185 263
Average loans in repayment                 156 231 294
Ending loans in repayment $ 130       $ 185       $ 130 $ 185 $ 263