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Borrowings - Long Term Borrowings Narrative (Details) - USD ($) |  | 12 Months Ended |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 01, 2021 | Dec. 31, 2024 | Dec. 31, 2023 | Feb. 18, 2025 | Jan. 31, 2025 | Nov. 30, 2024 | Aug. 31, 2024 | May 31, 2024 | Aug. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Oct. 29, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes Issued |  | $ 2,216,000,000 | $ 1,147,000,000 |  |  |  |  |  |  |  |  |
Loan Principal |  | 2,150,266,000 | 1,001,058,000 |  |  |  |  |  |  |  |  |
Capitalized Interest |  | $ 177,337,000 | $ 68,143,000 |  |  |  |  |  |  |  |  |
Estimated weighted average life of student loans |  | 5 years 7 months 6 days | 5 years |  |  |  |  |  |  |  |  |
Senior Unsecured Notes Due October 29, 2025 | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes Issued |  | $ 499,000,000 |  |  |  |  |  |  |  |  |  | $ 500,000,000
Interest rate |  |  |  |  |  |  |  |  |  |  |  | 4.20%
Senior Unsecured Notes Due October 29, 2025 | Unsecured Debt | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 4.20% |  |  |  |  |  |  |  |
Senior Unsecured Notes Due November 2, 2026 | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes Issued | $ 500,000,000 | 496,000,000 |  |  |  |  |  |  |  |  |  |
Interest rate | 3.125% |  |  |  |  |  |  |  |  |  |  |
Issuance price | 99.43% |  |  |  |  |  |  |  |  |  |  |
2024-C ABS Transaction |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes Issued |  |  |  |  |  |  |  | $ 668,000,000 |  |  |  |
Loan Principal |  | 646,550,000 |  |  |  |  |  |  |  |  |  |
Capitalized Interest |  | 52,968,000 |  |  |  |  |  |  |  |  |  |
2024-E ABS Transaction |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes Issued |  |  |  |  |  |  | $ 868,000,000 |  |  |  |  |
Loan Principal |  | 841,355,000 |  |  |  |  |  |  |  |  |  |
Capitalized Interest |  | 69,238,000 |  |  |  |  |  |  |  |  |  |
2024-F ABS Transaction |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes Issued |  |  |  |  |  | $ 680,000,000 |  |  |  |  |  |
Loan Principal |  | 662,361,000 |  |  |  |  |  |  |  |  |  |
Capitalized Interest |  | 55,131,000 |  |  |  |  |  |  |  |  |  |
2023-A ABS Transaction |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes Issued |  |  |  |  |  |  |  |  |  | $ 579,000,000 |  |
Loan Principal |  |  | $ 484,551,000 |  |  |  |  |  |  |  |  |
Capitalized Interest |  |  | 32,856,000 |  |  |  |  |  |  |  |  |
2023-C ABS Transaction |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes Issued |  |  |  |  |  |  |  |  | $ 568,000,000 |  |  |
Loan Principal |  |  | 516,507,000 |  |  |  |  |  |  |  |  |
Capitalized Interest |  |  | $ 35,287,000 |  |  |  |  |  |  |  |  |
ABS Transactions |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Private education loan term accounted for as a secured financing |  |  |  |  |  |  |  |  |  |  | $ 10,380,000,000 |
Private Education Loans |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Private education loan term accounted for as a secured financing |  | 3,740,000,000 |  |  |  |  |  |  |  |  |  |
Loan Principal |  | 3,630,000,000 |  |  |  |  |  |  |  |  |  |
Capitalized Interest |  | $ 107,000,000 |  |  |  |  |  |  |  |  |  |
Senior Unsecured Notes Due February XX 2028 Member | Unsecured Debt | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes Issued |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |
Interest rate |  |  |  |  | 6.50% |  |  |  |  |  |  |

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