v3.26.1
Consolidations and Transfers of Financial Assets - Unconsolidated VIEs (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Variable Interest Entities [Line Items]    
Total Assets $ 4,314,635 $ 4,317,538
Total UPB of mortgage loans 4,093,384 4,095,866
Multifamily    
Variable Interest Entities [Line Items]    
Total UPB of mortgage loans 532,841 524,962
Multifamily | Unconsolidated VIEs    
Variable Interest Entities [Line Items]    
Total UPB of mortgage loans 532,800  
Securitization and resecuritization trusts | Unconsolidated VIEs    
Variable Interest Entities [Line Items]    
Total Assets 533,881 535,491
Maximum Exposure to Loss 193,906 199,010
Net carrying amount 18,200 14,100
Credit risk transfer SPVs | Unconsolidated VIEs    
Variable Interest Entities [Line Items]    
Total Assets 22,879 22,835
Maximum Exposure to Loss 22,892 22,847
Limited partnerships, including low income housing tax credit ("LIHTC") investments    
Variable Interest Entities [Line Items]    
Net carrying amount 2,500 2,500
Limited partnerships, including low income housing tax credit ("LIHTC") investments | Unconsolidated VIEs    
Variable Interest Entities [Line Items]    
Total Assets 6,960 6,973
Maximum Exposure to Loss 744 750
Net carrying amount $ 744 $ 750