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Organization and Business - Additional Information (Detail) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) Client | Dec. 31, 2022 USD ($)
Organization And Business [Line Items] |  |
Loans, net | $ 54,827 | $ 62,250
Private Education Loans [Member] |  |
Organization And Business [Line Items] |  |
Loans, net | 16,902 | 18,725
FFELP Loans [Member] |  |
Organization And Business [Line Items] |  |
Loans, net | 37,925 | 43,525
Federal Education Loans [Member] |  |
Organization And Business [Line Items] |  |
Loans, net | 37,925 | 43,525
Federal Education Loans [Member] | FFELP Loans [Member] |  |
Organization And Business [Line Items] |  |
Loans, net | 38,000 |
Consumer Lending [Member] |  |
Organization And Business [Line Items] |  |
Loans, net | 16,902 | $ 18,725
Consumer Lending [Member] | Private Education Loans [Member] |  |
Organization And Business [Line Items] |  |
Loans, net | 17,000 |
Loans originated | $ 1,000 |
Business Processing [Member] | Minimum [Member] |  |
Organization And Business [Line Items] |  |
Number of clients for business processing services | Client | 500 |

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