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Allowance for Loan Losses - Loan Type (Detail) - FFELP Loans [Member] - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total Loans, gross | $ 38,140 | $ 43,747 | $ 52,903
Change | (5,607) |  |
Stafford Loans [Member] |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total Loans, gross | 12,171 | 14,019 |
Change | (1,848) |  |
Consolidation Loans [Member] |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total Loans, gross | 22,272 | 25,522 |
Change | (3,250) |  |
Rehab Loans [Member] |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Total Loans, gross | 3,697 | $ 4,206 |
Change | $ (509) |  |

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