Securitizations and Variable Interest Entities - Schedule of Assets That Relate to Continuing Involvement with Transferred Financial Assets with Servicing Rights and Maximum Exposure to Loss Including the Unpaid Principal Balance (Details) - USD ($) $ in Millions |
Mar. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items] | ||
| UPB of loans transferred | $ 52,545.6 | $ 49,641.2 |
| Maximum exposure to loss | 53,422.2 | 50,505.0 |
| GinnieMae | ||
| Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items] | ||
| UPB of loans transferred | 12,000.0 | 11,700.0 |
| Mortgage Servicing Rights - Fair Value | ||
| Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items] | ||
| Carrying value of assets | 759.7 | 734.2 |
| Advances | ||
| Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items] | ||
| Carrying value of assets | $ 116.9 | $ 129.6 |