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Borrowings - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Debt Instrument [Line Items] |  |  |
Outstanding borrowings under facility | $ 57,628 | $ 66,896 |
Issuance of unsecured debt | 1,000 | $ 0 | $ 1,300
FFELP Loan ABCP Facilities [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Outstanding borrowings under facility | 1,900 |  |
Assets securing facility | 2,100 |  |
Maximum unused capacity | 408 |  |
Unencumbered Loans | $ 92 |  |
FFELP Loan ABCP Facilities [Member] | Minimum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Facility maturity date | 2024-11 |  |
FFELP Loan ABCP Facilities [Member] | Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Facility maturity date | 2025-04 |  |
FFELP Loan | Asset-backed Securities, Securitized Loans and Receivables [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Outstanding borrowings under facility | $ 181 |  |
Private Education Loan ABCP Facilities [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Outstanding borrowings under facility | 2,100 |  |
Assets securing facility | 2,500 |  |
Maximum unused capacity | 1,700 |  |
Unencumbered Loans | $ 1,100 |  |
Private Education Loan ABCP Facilities [Member] | Minimum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Facility maturity date | 2024-06 |  |
Private Education Loan ABCP Facilities [Member] | Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Facility maturity date | 2025-06 |  |
Private Education Loan Repurchase Facilities | Asset-backed Securities, Securitized Loans and Receivables [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Outstanding borrowings under facility | $ 400 |  |

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