Loans Held for Investment - Narrative (Details) - USD ($) |
6 Months Ended | 12 Months Ended |
|---|---|---|
Jun. 30, 2026 |
Dec. 31, 2025 |
|
| Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items] | ||
| Securitized debt loans held for investment at cost | $ 8,000,000,000.0 | $ 9,800,000,000 |
| Unpaid principal balance | 8,141,676,000 | 9,988,601,000 |
| Fair Value | Seasoned Subprime Residential Mortgage Loans | ||
| Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items] | ||
| Loans 90 or more days delinquent | 465,000,000 | 558,000,000 |
| Loans held for investment | ||
| Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items] | ||
| Unpaid principal balance | 8,100,000,000 | 10,000,000,000.0 |
| Loans held for investment | ||
| Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items] | ||
| Retained balance | $ 0 | $ 0 |