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Allowance for Loan Losses - Allowance for Credit Losses and Recorded Investments in Loans (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Allowance for Loan Losses        
Beginning balance $ 1,166 $ 1,253 $ 1,271 $ 1,377
Provision:        
Reversal of allowance related to loan sales       (107)
Remaining provision       41
Total provision 28 22 62 (66)
Charge-offs:        
Gross charge-offs (130) (53) (310) (144)
Expected future recoveries on current period gross charge-offs 19 6 43 16
Total (111) (47) (267) (128)
Adjustment resulting from the change in charge-off rate (30) (16) (30) (16)
Net charge-offs (141) (63) (297) (144)
Decrease in expected future recoveries on previously fully charged-off loans 32 37 49 82
Allowance at end of period 1,085 1,249 1,085 1,249
FFELP Loans [Member]        
Allowance for Loan Losses        
Beginning balance 245 277 262 288
Charge-offs:        
Gross charge-offs (12) (8) (29) (19)
Total (12) (8) (29) (19)
Net charge-offs (12) (8) (29) (19)
Allowance at end of period $ 233 $ 269 $ 233 $ 269
Net charge-offs as a percentage of average loans in repayment, excluding the net adjustment resulting from the change in the charge-off rate 0.12% 0.07% 0.09% 0.06%
Net charge-offs as a percentage of average loans in repayment (annualized) 0.12% 0.07% 0.09% 0.06%
Ending total loans $ 47,124 $ 54,619 $ 47,124 $ 54,619
Average loans in repayment 39,573 45,201 41,793 46,191
Ending loans in repayment 37,731 44,160 37,731 44,160
Private Education Loans [Member]        
Allowance for Loan Losses        
Beginning balance 921 976 1,009 1,089
Provision:        
Reversal of allowance related to loan sales       (107)
Remaining provision       41
Total provision 28 22 62 (66)
Charge-offs:        
Gross charge-offs (118) (45) (281) (125)
Expected future recoveries on current period gross charge-offs 19 6 43 16
Total (99) (39) (238) (109)
Adjustment resulting from the change in charge-off rate (30) (16) (30) (16)
Net charge-offs (129) (55) (268) (125)
Decrease in expected future recoveries on previously fully charged-off loans 32 37 49 82
Allowance at end of period $ 852 $ 980 $ 852 $ 980
Net charge-offs as a percentage of average loans in repayment, excluding the net adjustment resulting from the change in the charge-off rate 2.01% 0.77% 1.59% 0.72%
Net adjustment resulting from the change in charge-off rate as a percentage of average loans in repayment 0.60% 0.33% 0.20% 0.11%
Net charge-offs as a percentage of average loans in repayment (annualized) 2.61% 1.10% 1.79% 0.83%
Ending total loans $ 20,003 $ 20,998 $ 20,003 $ 20,998
Average loans in repayment 19,628 19,894 20,056 20,145
Ending loans in repayment $ 19,284 $ 19,795 $ 19,284 $ 19,795