v3.25.4
Fair Value - Financial Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Fair Value Measurement [Domain]    
Financial assets:    
Netting Adjustment $ (199) $ (362)
Financial liabilities:    
Netting Adjustment (1,242) (2,367)
Available-for-sale securities 375 469
Derivative assets at fair value 177 179
Netting Adjustment (199) (362)
Derivative liabilities at fair value 152 154
Fannie Mae    
Financial liabilities:    
Debt: 256 385
Consolidated Trusts    
Financial liabilities:    
Debt: 15,060 13,292
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial assets:    
Cash, including restricted cash 42,583 38,536
Securities purchased under agreements to resell 0 0
Trading securities 55,205 77,610
Available-for-sale securities 0 0
Mortgage loans held for sale 0 0
Mortgage loans held for investment, net of allowance for loan losses 0 0
Advances to lenders 0 0
Derivative assets at fair value 0 0
Guaranty assets 0 0
Total financial assets 97,788 116,146
Financial liabilities:    
Derivative liabilities at fair value 0 0
Guaranty obligations 0 0
Total financial liabilities 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fannie Mae    
Financial liabilities:    
Short-term debt: 0 0
Debt: 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Consolidated Trusts    
Financial liabilities:    
Debt: 0 0
Significant Other Observable Inputs (Level 2)    
Financial assets:    
Cash, including restricted cash 0 0
Securities purchased under agreements to resell 45,650 56,250
Trading securities 14,282 1,090
Available-for-sale securities 34 42
Mortgage loans held for sale 23 130
Mortgage loans held for investment, net of allowance for loan losses 3,656,465 3,496,803
Advances to lenders 3,595 1,825
Derivative assets at fair value 304 487
Guaranty assets 0 0
Total financial assets 3,720,353 3,556,627
Financial liabilities:    
Derivative liabilities at fair value 1,387 2,506
Guaranty obligations 0 0
Total financial liabilities 3,832,394 3,700,088
Significant Other Observable Inputs (Level 2) | Fannie Mae    
Financial liabilities:    
Short-term debt: 24,548 11,193
Debt: 104,784 129,152
Significant Other Observable Inputs (Level 2) | Consolidated Trusts    
Financial liabilities:    
Debt: 3,701,675 3,557,237
Significant Unobservable Inputs (Level 3)    
Financial assets:    
Cash, including restricted cash 0 0
Securities purchased under agreements to resell 0 0
Trading securities 27 28
Available-for-sale securities 341 427
Mortgage loans held for sale 201 258
Mortgage loans held for investment, net of allowance for loan losses 137,864 127,763
Advances to lenders 0 0
Derivative assets at fair value 72 54
Guaranty assets 172 160
Total financial assets 138,677 128,690
Financial liabilities:    
Derivative liabilities at fair value 7 15
Guaranty obligations 54 60
Total financial liabilities 898 916
Significant Unobservable Inputs (Level 3) | Fannie Mae    
Financial liabilities:    
Short-term debt: 0 0
Debt: 602 567
Significant Unobservable Inputs (Level 3) | Consolidated Trusts    
Financial liabilities:    
Debt: 235 274
Carrying value    
Financial assets:    
Cash, including restricted cash 42,583 38,536
Securities purchased under agreements to resell 45,650 56,250
Trading securities 69,514 78,728
Available-for-sale securities 375 469
Mortgage loans held for sale 209 373
Mortgage loans held for investment, net of allowance for loan losses 4,119,104 4,137,633
Advances to lenders 3,595 1,825
Derivative assets at fair value 177 179
Guaranty assets 90 64
Total financial assets 4,281,297 4,314,057
Financial liabilities:    
Derivative liabilities at fair value 152 154
Guaranty obligations 96 69
Total financial liabilities 4,180,677 4,228,320
Carrying value | Fannie Mae    
Financial liabilities:    
Short-term debt: 24,538 11,188
Debt: 102,751 128,234
Carrying value | Consolidated Trusts    
Financial liabilities:    
Debt: 4,053,140 4,088,675
Estimate of fair value    
Financial assets:    
Cash, including restricted cash 42,583 38,536
Securities purchased under agreements to resell 45,650 56,250
Trading securities 69,514 78,728
Available-for-sale securities 375 469
Mortgage loans held for sale 224 388
Mortgage loans held for investment, net of allowance for loan losses 3,794,329 3,624,566
Advances to lenders 3,595 1,825
Derivative assets at fair value 177 179
Guaranty assets 172 160
Total financial assets 3,956,619 3,801,101
Financial liabilities:    
Derivative liabilities at fair value 152 154
Guaranty obligations 54 60
Total financial liabilities 3,832,050 3,698,637
Estimate of fair value | Fannie Mae    
Financial liabilities:    
Short-term debt: 24,548 11,193
Debt: 105,386 129,719
Estimate of fair value | Consolidated Trusts    
Financial liabilities:    
Debt: $ 3,701,910 $ 3,557,511