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Borrowings - Unconsolidated VIEs Narrative (Details) - USD ($) $ in Millions |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
May 24, 2023 | Oct. 19, 2022 | May 27, 2022 | Mar. 16, 2022 | Dec. 31, 2023 | Dec. 31, 2022
Debt Instrument [Line Items] |  |  |  |  |  |
Vertical risk retention interest |  |  |  |  | 5.00% | 5.00%
2023-B |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Vertical risk retention interest |  |  |  |  | 5.00% |
2023-B | Student Loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Private education loans sold | $ 2,000 |  |  |  |  |
Additional net proceeds from sales of loans held for investment, capitalized interest | 105 |  |  |  |  |
Gain on sale | 5 |  |  |  |  |
2023-D |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Vertical risk retention interest |  |  |  |  | 5.00% |
2023-D | Student Loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Private education loans sold | 1,000 |  |  |  |  |
Additional net proceeds from sales of loans held for investment, capitalized interest | 53 |  |  |  |  |
Gain on sale | $ 1 |  |  |  |  |
2022-A |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Vertical risk retention interest |  |  |  | 5.00% |  |
2022-A | Student Loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Private education loans sold |  |  |  | $ 973 |  |
Additional net proceeds from sales of loans held for investment, capitalized interest |  |  |  | 95 |  |
Gain on sale |  |  |  | $ 10 |  |
2022-B |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Vertical risk retention interest |  |  | 5.00% |  |  |
2022-B | Student Loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Private education loans sold |  |  | $ 2,000 |  |  |
Additional net proceeds from sales of loans held for investment, capitalized interest |  |  | 107 |  |  |
Gain on sale |  |  | $ 11 |  |  |
2022-D |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Vertical risk retention interest |  |  | 5.00% |  |  |
2022-D | Student Loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Private education loans sold |  | $ 1,000 |  |  |  |
Additional net proceeds from sales of loans held for investment, capitalized interest |  | 54 |  |  |  |
Gain on sale |  | $ 3 |  |  |  |

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