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Borrowings - Short Term Borrowings (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jul. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Short-term Debt [Line Items] |  |  |
Short-Term |  | $ 0 | $ 0
Weighted Average Interest Rate |  | 0.00% |
Average Balance |  | $ 122,396,000 |
Weighted Average Interest Rate(1) |  | 5.78% |
Maximum outstanding at any month end |  | $ 199,651,000 | 289,230,000
Borrowing limit increase |  | 2,000,000,000 | 2,000,000,000
Senior Unsecured Notes Due April 5, 2022 |  |  |
Short-term Debt [Line Items] |  |  |
Short-Term |  | $ 0 |
Weighted Average Interest Rate |  | 0.00% |
Average Balance |  | $ 122,396,000 |
Weighted Average Interest Rate(1) |  | 5.78% |
Secured Borrowing Facility |  |  |
Short-term Debt [Line Items] |  |  |
Short-Term |  | $ 0 | $ 0
Contractual maturity related to ABCP facility |  | 2 years |
Weighted Average Interest Rate |  | 0.00% | 0.00%
Average Balance |  | $ 0 | $ 45,820,000
Weighted Average Interest Rate(1) |  | 0.00% | 24.99%
Commercial Paper | Secured Borrowing Facility |  |  |
Short-term Debt [Line Items] |  |  |
Private education loan funding | $ 2,000,000,000 |  |
Ownership interest percentage | 100.00% |  |
Short-Term |  | $ 0 | $ 0

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