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Borrowings - Unconsolidated VIEs (Details) - USD ($) $ in Millions |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 27, 2021 | Feb. 09, 2021 | Mar. 31, 2020 | Dec. 31, 2021
Debt Instrument [Line Items] |  |  |  |
Vertical risk retention interest |  |  | 5.00% | 5.00%
2021-A |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Vertical risk retention interest |  | 5.00% |  |
2021-A | Student Loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Private education loans sold |  | $ 2,500 |  |
Additional net proceeds from sales of loans held for investment, capitalized interest |  | 130 |  |
Gain on sale |  | $ 18 |  |
2021-C |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Vertical risk retention interest | 5.00% |  |  |
2021-C | Student Loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Private education loans sold | $ 505 |  |  |
Additional net proceeds from sales of loans held for investment, capitalized interest | 27 |  |  |
Gain on sale | $ 4 |  |  |

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