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Consolidations and Transfers of Financial Assets - Unconsolidated VIEs (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Variable Interest Entities [Line Items]    
Total Assets $ 4,338,227 $ 4,349,731
Total unpaid principal balance of mortgage loans 4,095,019 4,110,196
Multifamily    
Variable Interest Entities [Line Items]    
Total unpaid principal balance of mortgage loans 501,559 490,358
Multifamily | Unconsolidated VIEs    
Variable Interest Entities [Line Items]    
Total unpaid principal balance of mortgage loans 501,600  
Securitization and resecuritization trusts | Unconsolidated VIEs    
Variable Interest Entities [Line Items]    
Total Assets 200,507 203,841
Maximum Exposure to Loss 195,404 203,316
Net carrying amount 1,300 1,200
Credit risk transfer SPVs | Unconsolidated VIEs    
Variable Interest Entities [Line Items]    
Total Assets 24,620 23,222
Maximum Exposure to Loss 24,623 23,224
Limited partnerships, including low income housing tax credit ("LIHTC") investments    
Variable Interest Entities [Line Items]    
Net carrying amount 2,100 2,000
Limited partnerships, including low income housing tax credit ("LIHTC") investments | Unconsolidated VIEs    
Variable Interest Entities [Line Items]    
Total Assets 6,372 6,428
Maximum Exposure to Loss 713 669
Net carrying amount $ 713 $ 669