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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 | Jun. 30, 2024 | Dec. 31, 2023
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Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items] |  |
UPB of loans transferred | $ 47,658.7 | $ 46,810.1
Maximum exposure to loss | 48,434.3 | 47,545.6
GinnieMae |  |
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items] |  |
UPB of loans transferred | 10,500.0 | 10,500.0
Mortgage Servicing Rights - Fair Value |  |
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items] |  |
Carrying value of assets | 690.6 | 636.5
Advances |  |
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items] |  |
Carrying value of assets | $ 85.1 | $ 99.0

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