v3.26.3
Securitization and Consolidation - Non-Consolidated VIEs (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Assets [Abstract]    
Investment securities, at fair value $ 78,167 $ 85,412
Other Assets 27,815 26,566
Assets 3,532,205 3,497,598
Outstanding balance of the guarantor advance 300 400
Liabilities [Abstract]    
Other Liabilities 12,380 11,595
Variable Interest Entity, Not Primary Beneficiary    
Assets [Abstract]    
Investment securities, at fair value 10,643 12,006
Other Assets 4,505 5,257
Assets 453,029 487,914
Maximum Exposure to Loss 393,518 422,902
Liabilities [Abstract]    
Other Liabilities 5,408 5,120
Variable Interest Entity, Not Primary Beneficiary | Other    
Assets [Abstract]    
Investment securities, at fair value 0 0
Other Assets 6 7
Assets 55 64
Maximum Exposure to Loss 12 15
Liabilities [Abstract]    
Other Liabilities 0 0
Variable Interest Entity, Not Primary Beneficiary | Single Family Guarantee Segment    
Assets [Abstract]    
Investment securities, at fair value 7,434 6,954
Other Assets 335 333
Assets 144,606 152,832
Maximum Exposure to Loss 117,760 123,364
Liabilities [Abstract]    
Other Liabilities 1,958 1,307
Variable Interest Entity, Not Primary Beneficiary | Single Family Guarantee Segment | Securitization products    
Assets [Abstract]    
Investment securities, at fair value 1,312 1,451
Other Assets 145 162
Assets 28,391 30,025
Maximum Exposure to Loss 23,269 24,604
Liabilities [Abstract]    
Other Liabilities 475 498
Variable Interest Entity, Not Primary Beneficiary | Single Family Guarantee Segment | Guarantees of Fannie Mae securities    
Assets [Abstract]    
Investment securities, at fair value 6,122 5,503
Other Assets 90 74
Assets 94,144 98,370
Maximum Exposure to Loss 94,488 98,754
Liabilities [Abstract]    
Other Liabilities 1,404 675
Variable Interest Entity, Not Primary Beneficiary | Single Family Guarantee Segment | CRT products    
Assets [Abstract]    
Investment securities, at fair value 0 0
Other Assets 100 97
Assets 22,071 24,437
Maximum Exposure to Loss 3 6
Liabilities [Abstract]    
Other Liabilities 79 134
Variable Interest Entity, Not Primary Beneficiary | Multifamily    
Assets [Abstract]    
Investment securities, at fair value 3,209 5,052
Other Assets 4,164 4,917
Assets 308,368 335,018
Maximum Exposure to Loss 275,746 299,523
Liabilities [Abstract]    
Other Liabilities 3,450 3,813
Variable Interest Entity, Not Primary Beneficiary | Multifamily | Securitization products    
Assets [Abstract]    
Investment securities, at fair value 3,209 5,052
Other Assets 4,110 4,886
Assets 305,165 332,572
Maximum Exposure to Loss 275,714 299,507
Liabilities [Abstract]    
Other Liabilities 3,432 3,792
Variable Interest Entity, Not Primary Beneficiary | Multifamily | CRT products    
Assets [Abstract]    
Investment securities, at fair value 0 0
Other Assets 54 31
Assets 3,203 2,446
Maximum Exposure to Loss 32 16
Liabilities [Abstract]    
Other Liabilities $ 18 $ 21