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Securitizations and Variable Interest Entities (Details) - USD ($)
$ in Billions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Variable Interest Entity [Line Items]    
Investment, Proportional Amortization Method, Elected, Amount $ 5.2 $ 4.3
Investment, Proportional Amortization Method, Elected, Statement of Financial Position [Extensible Enumeration] Other Assets Other Assets
WI K- deal Certificate | Multifamily    
Variable Interest Entity [Line Items]    
UPB of Issuances and Guarantees $ 1.5 $ 2.9
Other | Single-family Guarantee    
Variable Interest Entity [Line Items]    
Consolidated UPB of VIE 3.7 4.1
Level 1 Securitization products | Single-family Guarantee    
Variable Interest Entity [Line Items]    
Consolidated UPB of VIE 3,100.0 3,000.0
Held by consolidated trusts | MF 55-Day PCs | Multifamily    
Variable Interest Entity [Line Items]    
Consolidated UPB of VIE 90.4 64.8
Held by consolidated trusts | WI K- deal Certificate | Multifamily    
Variable Interest Entity [Line Items]    
Consolidated UPB of VIE 0.0 0.0
Other Securitization Trust | Other | Multifamily    
Variable Interest Entity [Line Items]    
Consolidated UPB of VIE $ 24.7 $ 5.7