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v3.25.2

Borrowings - Narrative (Details) - USD ($) |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 13, 2025 | Feb. 18, 2025 | Jun. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Jan. 31, 2025 | Aug. 31, 2024 | Jun. 14, 2024 | May 31, 2024
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Short-term borrowings |  |  | $ 0 | $ 0 | $ 0 |  |  |  |
Estimated weighted average life of student loans |  |  | 5 years 7 months 6 days |  | 5 years 7 months 6 days |  |  |  |
Vertical risk retention interest |  |  |  | 5.00% |  |  |  |  |
Uncommitted federal funds |  |  | $ 125,000,000 | $ 125,000,000 |  |  |  |  |
Lendable value of collateral |  |  | 2,500,000,000 | 2,500,000,000 | $ 2,200,000,000 |  |  |  |
Unsecured borrowings |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Short-term borrowings |  |  | 0 | 0 | 0 |  |  |  |
Secured Borrowings | Line of Credit |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Secured borrowing facility maximum borrowing capacity | $ 2,500,000,000 |  |  |  |  |  |  | $ 2,000,000,000 |
Line of credit facility, interest holding percentage | 100.00% |  |  |  |  |  |  |  |
Short-term borrowings |  |  | 0 | 0 | $ 0 |  |  |  |
2024-C ABS Transaction |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Notes Issued |  |  |  |  |  |  |  |  | $ 668,000,000
2024-E ABS Transaction |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Notes Issued |  |  |  |  |  |  | $ 868,000,000 |  |
ABCP borrowings | Secured Borrowings |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Line of credit facility, expiration period | 2 years |  |  |  |  |  |  |  |
Senior Unsecured Notes Due January 31, 2030 | Unsecured borrowings |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Notes Issued |  |  |  |  |  | $ 500,000,000 |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  | 6.50% |  |  |
Unsecured debt |  |  | $ 493,000,000 | $ 493,000,000 |  |  |  |  |
Senior Unsecured Notes Due October 29, 2025 | Unsecured borrowings |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  | 4.20% |  |  |  |  |  |  |
Repayments of long-term debt |  | $ 500,000,000 |  |  |  |  |  |  |
Debt instrument, redemption price, percentage |  | 100.00% |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  | $ (1,000,000) |  |  |  |  |  |  |

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