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Borrowings - Secured Financing (Details) - USD ($) | 1 Months Ended |  |
--- | --- | --- | ---
Nov. 30, 2021 | Aug. 31, 2021 | May 31, 2021 | Aug. 31, 2020 | Feb. 29, 2020 | Dec. 31, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total Issued |  |  |  |  |  | $ 1,592,000,000 | $ 1,343,000,000
Total loans and accrued interest amount securitized at inception |  |  |  |  |  | 1,656,263,000 | $ 1,463,230,000
2020-A |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total Issued |  |  |  |  | $ 636,000,000 |  |
Basis spread on variable rate |  |  |  |  | 0.88% |  |
Weighted Average Life (in years) |  |  |  |  | 4 years 2 months 4 days |  |
2020-B |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total Issued |  |  |  | $ 707,000,000 |  |  |
Basis spread on variable rate |  |  |  | 1.30% |  |  |
Weighted Average Life (in years) |  |  |  | 4 years 1 month 20 days |  |  |
2021-B |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total Issued |  |  | $ 531,000,000 |  |  |  |
Basis spread on variable rate |  |  | 0.77% |  |  |  |
Weighted Average Life (in years) |  |  | 4 years 3 months 3 days |  |  |  |
Loans Pledged as Collateral |  |  |  |  |  | 496,000,000 |
Principal amount of collateral |  |  |  |  |  | 467,000,000 |
Capitalized interest |  |  |  |  |  | 29,000,000 |
2021-D |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total Issued |  | $ 527,000,000 |  |  |  |  |
Basis spread on variable rate |  | 0.69% |  |  |  |  |
Weighted Average Life (in years) |  | 4 years 2 months 19 days |  |  |  |  |
Loans Pledged as Collateral |  |  |  |  |  | 515,000,000 |
Principal amount of collateral |  |  |  |  |  | 485,000,000 |
Capitalized interest |  |  |  |  |  | 30,000,000 |
2021-E |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Total Issued | $ 534,000,000 |  |  |  |  |  |
Basis spread on variable rate | 0.69% |  |  |  |  |  |
Weighted Average Life (in years) | 4 years 1 month 24 days |  |  |  |  |  |
Loans Pledged as Collateral |  |  |  |  |  | 533,000,000 |
Principal amount of collateral |  |  |  |  |  | 502,000,000 |
Capitalized interest |  |  |  |  |  | 31,000,000 |
Private Education Loan term securitizations |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Loans Pledged as Collateral |  |  |  |  |  | 1,110,000,000 |
Principal amount of collateral |  |  |  |  |  | 1,050,000,000.00 |
Capitalized interest |  |  |  |  |  | $ 62,000,000 |

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