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Allowance for Loan Losses - Allowance for Credit Losses and Recorded Investments in Loans (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Allowance for Loan Losses        
Allowance at beginning of period $ 579 $ 744 $ 621 $ 832
Provision:        
Total provision 37 14 67 26
Charge-offs:        
Gross charge-offs (100) (87) (187) (207)
Expected future recoveries on current period gross charge-offs 13 10 23 21
Total (87) (77) (164) (186)
Adjustment resulting from the change in charge-off rate 1 0 2 0
Net charge-offs (88) (77) (166) (186)
Decrease in expected future recoveries on previously fully charged-off loans 2 6 8 15
Allowance at end of period 530 687 530 687
FFELP Loans [Member]        
Allowance for Loan Losses        
Allowance at beginning of period 182 206 180 215
Provision:        
Total provision 8 (2) 16 (1)
Charge-offs:        
Gross charge-offs (8) (10) (14) (20)
Expected future recoveries on current period gross charge-offs 0 0 0 0
Total (8) (10) (14) (20)
Adjustment resulting from the change in charge-off rate 0 0 0 0
Net charge-offs (8) (10) (14) (20)
Decrease in expected future recoveries on previously fully charged-off loans 0 0 0 0
Allowance at end of period $ 182 $ 194 $ 182 $ 194
Net charge-offs as a percentage of average loans in repayment, excluding the net adjustment resulting from the change in charge-off rate (annualized) 0.14% 0.14% 0.12% 0.14%
Net adjustment resulting from the change in charge-off rate as a percentage of average loans in repayment (annualized) 0.00% 0.00% 0.00% 0.00%
Net charge-offs as a percentage of average loans in repayment (annualized) 0.14% 0.14% 0.12% 0.14%
Ending total loans $ 29,800 $ 33,134 $ 29,800 $ 33,134
Average loans in repayment 25,133 27,509 25,295 28,622
Ending loans in repayment 24,867 26,411 24,867 26,411
Private Education Loans [Member]        
Allowance for Loan Losses        
Allowance at beginning of period 397 538 441 617
Provision:        
Total provision 29 16 51 27
Charge-offs:        
Gross charge-offs (92) (77) (173) (187)
Expected future recoveries on current period gross charge-offs 13 10 23 21
Total (79) (67) (150) (166)
Adjustment resulting from the change in charge-off rate 1 0 2 0
Net charge-offs (80) (67) (152) (166)
Decrease in expected future recoveries on previously fully charged-off loans 2 6 8 15
Allowance at end of period $ 348 $ 493 $ 348 $ 493
Net charge-offs as a percentage of average loans in repayment, excluding the net adjustment resulting from the change in charge-off rate (annualized) 2.06% 1.65% 1.96% 2.03%
Net adjustment resulting from the change in charge-off rate as a percentage of average loans in repayment (annualized) 0.02% 0.00% 0.02% 0.00%
Net charge-offs as a percentage of average loans in repayment (annualized) 2.08% 1.65% 1.98% 2.03%
Ending total loans $ 15,878 $ 16,731 $ 15,878 $ 16,731
Average loans in repayment 15,375 16,271 15,423 16,471
Ending loans in repayment $ 15,267 $ 16,087 $ 15,267 $ 16,087