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Securitizations and Variable Interests Entities - Schedule of Carrying Amounts of Assets that Relate to Continuing Involvement with Transferred Forward Loans (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
UPB of loans transferred $ 37,571.1 $ 31,864.8
Maximum exposure to loss (2) 38,171.2 32,376.8
Ginnie Mae    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
UPB of loans transferred 6,800.0 5,600.0
Mortgage Servicing Rights    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Carrying value of assets 524.3 360.8
Advances    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Carrying value of assets $ 75.9 $ 151.2