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Consolidations and Transfers of Financial Assets - Unconsolidated VIEs (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Variable Interest Entities [Line Items]    
Investments in securities, at fair value $ 79,347 $ 79,197
Other assets 13,727 14,008
Other liabilities (14,837) (15,392)
Assets 4,353,709 4,349,731
Total unpaid principal balance of mortgage loans 4,100,171 4,110,196
Multifamily    
Variable Interest Entities [Line Items]    
Total unpaid principal balance of mortgage loans 495,424 490,358
Multifamily | Unconsolidated VIEs    
Variable Interest Entities [Line Items]    
Total unpaid principal balance of mortgage loans 495,400  
Mortgage-related securities | Unconsolidated VIEs    
Variable Interest Entities [Line Items]    
Investments in securities, at fair value 1,094 1,182
Other assets 32 33
Other liabilities (37) (38)
Net carrying amount 1,089 1,177
Maximum exposure to loss 199,000 203,000
Assets 200,000 204,000
Partnership interest LIHTC | Unconsolidated VIEs    
Variable Interest Entities [Line Items]    
Net carrying amount 697 669
Maximum exposure to loss 697 669
Assets 6,300 6,400
Available-for-Sale Securities | Unconsolidated VIEs    
Variable Interest Entities [Line Items]    
Maximum exposure to loss 24,200 23,200
Assets $ 24,200 $ 23,200