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Education Loans - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Accounts Notes And Loans Receivable [Line Items] |  |
Loans, net | $ 54,827 | $ 62,250
Percentage of education loan portfolio in repayment | 85.00% | 84.00%
FFELP Loans [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Loans, net | $ 37,925 | $ 43,525
After October 1 1993 and before July 1 2006 [Member] | FFELP Loans [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Percentage reimbursement on all qualifying default claims period | 98.00% |
On or After July 1 2006 [Member] | FFELP Loans [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Percentage reimbursement on all qualifying default claims period | 97.00% |
Weighted Average [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Estimated weighted average life of education loans | 5 years | 6 years
Stafford Loans [Member] | FFELP Loans [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Loans, net | $ 13,564 | $ 15,691
Stafford Loans [Member] | Minimum [Member] | FFELP Loans [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Repayment term | 5 years |
Stafford Loans [Member] | Maximum [Member] | FFELP Loans [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Repayment term | 10 years |
Consolidation Loans [Member] | FFELP Loans [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Loans, net | $ 24,361 | 27,834
Consolidation Loans [Member] | Minimum [Member] | FFELP Loans [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Repayment term | 12 years |
Consolidation Loans [Member] | Maximum [Member] | FFELP Loans [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Repayment term | 30 years |
Private Education Loans [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Loans, net | $ 16,902 | $ 18,725
Private Education Loans [Member] | Minimum [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Repayment term | 10 years |
Private Education Loans [Member] | Maximum [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Repayment term | 15 years |
In School Loans [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Loans, net | $ 641 |

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