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Allowance for Loan Losses - Allowance for Credit Losses and Recorded Investments in Loans (Detail)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
SecurityLoan
Jun. 30, 2015
USD ($)
SecurityLoan
Jun. 30, 2016
USD ($)
SecurityLoan
Jun. 30, 2015
USD ($)
SecurityLoan
Allowance for Loan Losses        
Beginning balance $ 1,519 $ 1,963 $ 1,564 $ 2,033
Total provision 110 198 221 323
Net adjustment resulting from the change in the charge-off rate   (330)   (330)
Net charge-offs remaining   (190)   (388)
Charge-offs (145) (520) (304) (718)
Reclassification of interest reserve 3 2 6 5
Ending balance 1,487 1,643 1,487 1,643
Allowance:        
Ending balance: individually evaluated for impairment 1,174 1,274 1,174 1,274
Ending balance: collectively evaluated for impairment 313 369 313 369
Loans:        
Ending balance: individually evaluated for impairment 11,195 10,810 11,195 10,810
Ending balance: collectively evaluated for impairment 107,244 118,697 107,244 118,697
FFELP Loans [Member]        
Allowance for Loan Losses        
Beginning balance 70 91 78 93
Total provision 10 7 17 12
Net charge-offs remaining   (9)   (16)
Charge-offs (18) (9) (33) (16)
Ending balance 62 89 62 89
Allowance:        
Ending balance: collectively evaluated for impairment 62 89 62 89
Loans:        
Ending balance: collectively evaluated for impairment $ 91,719 $ 99,207 $ 91,719 $ 99,207
Net charge-offs as a percentage of average loans in repayment, excluding the net adjustment resulting from the change in the charge-off rate (annualized)   0.05%   0.04%
Charge-offs as a percentage of average loans in repayment (annualized) 0.10%   0.09%  
Allowance coverage of charge-offs (annualized) | SecurityLoan 0.9   1.0  
Allowance coverage of net charge-offs, excluding the net adjustment resulting from the change in the charge-off rate (annualized) | SecurityLoan   2.3   2.8
Allowance as a percentage of the ending total loan balance 0.07% 0.09% 0.07% 0.09%
Allowance as a percentage of the ending loans in repayment 0.09% 0.12% 0.09% 0.12%
Ending total loans $ 91,719 $ 99,207 $ 91,719 $ 99,207
Average loans in repayment 72,973 76,325 73,331 76,896
Ending loans in repayment 72,058 75,244 72,058 75,244
Private Education Loans [Member]        
Allowance for Loan Losses        
Beginning balance 1,434 1,849 1,471 1,916
Total provision 100 191 204 311
Net adjustment resulting from the change in the charge-off rate   (330)   (330)
Net charge-offs remaining   (179)   (369)
Charge-offs (127) (509) (271) (699)
Reclassification of interest reserve 3 2 6 5
Ending balance 1,410 1,533 1,410 1,533
Allowance:        
Ending balance: individually evaluated for impairment 1,163 1,257 1,163 1,257
Ending balance: collectively evaluated for impairment 247 276 247 276
Loans:        
Ending balance: individually evaluated for impairment 11,162 10,769 11,162 10,769
Ending balance: collectively evaluated for impairment $ 15,478 $ 19,435 $ 15,478 $ 19,435
Net charge-offs as a percentage of average loans in repayment, excluding the net adjustment resulting from the change in the charge-off rate (annualized)   2.74%   2.82%
Charge-offs as a percentage of average loans in repayment (annualized) 2.17%   2.28%  
Net adjustment resulting from the change in the charge-off rate as a percentage of average loans in repayment (annualized)   5.07%   2.53%
Allowance coverage of charge-offs (annualized) | SecurityLoan 2.8   2.6  
Allowance coverage of net charge-offs, excluding the net adjustment resulting from the change in the charge-off rate (annualized) | SecurityLoan   2.1   2.1
Allowance as a percentage of the ending total loan balance 5.29% 5.08% 5.29% 5.08%
Allowance as a percentage of the ending loans in repayment 6.06% 5.93% 6.06% 5.93%
Ending total loans $ 26,640 $ 30,204 $ 26,640 $ 30,204
Average loans in repayment 23,561 26,122 23,871 26,382
Ending loans in repayment 23,265 25,865 23,265 25,865
Other Loans [Member]        
Allowance for Loan Losses        
Beginning balance 15 23 15 24
Net charge-offs remaining   (2)   (3)
Charge-offs   (2)   (3)
Ending balance 15 21 15 21
Allowance:        
Ending balance: individually evaluated for impairment 11 17 11 17
Ending balance: collectively evaluated for impairment 4 4 4 4
Loans:        
Ending balance: individually evaluated for impairment 33 41 33 41
Ending balance: collectively evaluated for impairment $ 47 $ 55 $ 47 $ 55
Net charge-offs as a percentage of average loans in repayment, excluding the net adjustment resulting from the change in the charge-off rate (annualized)   8.68%   6.01%
Charge-offs as a percentage of average loans in repayment (annualized) 1.32%   1.69%  
Allowance coverage of charge-offs (annualized) | SecurityLoan 13.5   10.4  
Allowance coverage of net charge-offs, excluding the net adjustment resulting from the change in the charge-off rate (annualized) | SecurityLoan   2.4   3.3
Allowance as a percentage of the ending total loan balance 18.18% 21.50% 18.18% 21.50%
Allowance as a percentage of the ending loans in repayment 18.18% 21.50% 18.18% 21.50%
Ending total loans $ 80 $ 96 $ 80 $ 96
Average loans in repayment 82 101 83 103
Ending loans in repayment $ 80 $ 96 $ 80 $ 96