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Borrowings - Company Borrowings (Details) - USD ($) | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Instrument [Line Items] |  |
Short-Term | $ 0 | $ 0
Long-Term | 5,219,310,000 | 5,930,990,000
Total | 5,219,310,000 | 5,930,990,000
Unsecured borrowings |  |
Debt Instrument [Line Items] |  |
Short-Term | 0 | 0
Long-Term | 987,384,000 | 986,138,000
Total | 987,384,000 | 986,138,000
Secured borrowings |  |
Debt Instrument [Line Items] |  |
Short-Term | 0 | 0
Long-Term | 4,231,926,000 | 4,944,852,000
Total | 4,231,926,000 | 4,944,852,000
Secured borrowings | Private Education Loan term securitizations |  |
Debt Instrument [Line Items] |  |
Short-Term | 0 | 0
Long-Term | 4,231,926,000 | 4,944,852,000
Total | 4,231,926,000 | 4,944,852,000
Secured borrowings | Private Education Loan term securitizations | Fixed-rate |  |
Debt Instrument [Line Items] |  |
Short-Term | 0 | 0
Long-Term | 3,368,758,000 | 3,897,996,000
Total | 3,368,758,000 | 3,897,996,000
Secured borrowings | Private Education Loan term securitizations | Variable-rate |  |
Debt Instrument [Line Items] |  |
Short-Term | 0 | 0
Long-Term | 863,168,000 | 1,046,856,000
Total | 863,168,000 | 1,046,856,000
Secured borrowings | Secured Borrowing Facility |  |
Debt Instrument [Line Items] |  |
Short-Term | 0 | 0
Long-Term | 0 | 0
Total | $ 0 | $ 0

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