v3.25.3
Securitization Activities and Consolidation - Non-Consolidated VIEs (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Assets [Abstract]    
Investment securities, at fair value $ 83,855 $ 55,771
Other Assets 26,323 21,333
Assets 3,468,187 3,386,692
Assets in VIE in which we do not have a variable interest in 1,100 700
Liabilities [Abstract]    
Other Liabilities 11,329 12,346
Variable Interest Entity, Not Primary Beneficiary    
Assets [Abstract]    
Investment securities, at fair value 12,830 12,055
Other Assets 5,616 5,522
Assets 499,722 518,307
Maximum Exposure to Loss 432,242 446,702
Liabilities [Abstract]    
Other Liabilities 5,137 5,724
Variable Interest Entity, Not Primary Beneficiary | Other    
Assets [Abstract]    
Investment securities, at fair value 0 0
Other Assets 7 7
Assets 66 79
Maximum Exposure to Loss 416 472
Liabilities [Abstract]    
Other Liabilities 5 5
Variable Interest Entity, Not Primary Beneficiary | Single Family Guarantee Segment    
Assets [Abstract]    
Investment securities, at fair value 7,186 6,792
Other Assets 335 315
Assets 155,016 161,382
Maximum Exposure to Loss 123,990 128,597
Liabilities [Abstract]    
Other Liabilities 1,227 1,330
Variable Interest Entity, Not Primary Beneficiary | Single Family Guarantee Segment | Securitization products    
Assets [Abstract]    
Investment securities, at fair value 1,695 1,633
Other Assets 165 157
Assets 30,219 30,038
Maximum Exposure to Loss 24,756 24,470
Liabilities [Abstract]    
Other Liabilities 495 458
Variable Interest Entity, Not Primary Beneficiary | Single Family Guarantee Segment | Guarantees of Fannie Mae securities    
Assets [Abstract]    
Investment securities, at fair value 5,491 5,159
Other Assets 73 69
Assets 99,228 104,120
Maximum Exposure to Loss 99,228 104,120
Liabilities [Abstract]    
Other Liabilities 584 701
Variable Interest Entity, Not Primary Beneficiary | Single Family Guarantee Segment | CRT products    
Assets [Abstract]    
Investment securities, at fair value 0 0
Other Assets 97 89
Assets 25,569 27,224
Maximum Exposure to Loss 6 7
Liabilities [Abstract]    
Other Liabilities 148 171
Variable Interest Entity, Not Primary Beneficiary | Multifamily    
Assets [Abstract]    
Investment securities, at fair value 5,644 5,263
Other Assets 5,274 5,200
Assets 344,640 356,846
Maximum Exposure to Loss 307,836 317,633
Liabilities [Abstract]    
Other Liabilities 3,905 4,389
Variable Interest Entity, Not Primary Beneficiary | Multifamily | Securitization products    
Assets [Abstract]    
Investment securities, at fair value 5,644 5,263
Other Assets 5,244 5,171
Assets 342,483 355,108
Maximum Exposure to Loss 307,818 317,611
Liabilities [Abstract]    
Other Liabilities 3,886 4,374
Variable Interest Entity, Not Primary Beneficiary | Multifamily | CRT products    
Assets [Abstract]    
Investment securities, at fair value 0 0
Other Assets 30 29
Assets 2,157 1,738
Maximum Exposure to Loss 18 22
Liabilities [Abstract]    
Other Liabilities $ 19 $ 15