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Fair Value - Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Fair Value Measurement [Domain]    
Financial assets [Abstract]    
Derivative assets, gross amount offset $ (290) $ (905)
Financial liabilities [Abstract]    
Derivative liabilities, gross amount offset (838) (995)
Available-for-sale, at fair value 886 1,697
Mortgage loans held for investment, net of allowance for loan losses 5,301 6,490
Derivative assets, gross amount offset (290) (905)
Derivative liabilities, gross amount offset (838) (995)
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial assets [Abstract]    
Cash and cash equivalents, including restricted cash and cash equivalents 74,064 97,179
Federal funds sold and securities purchased under agreements to resell or similar arrangements 0 0
Trading securities 92,192 130,456
Available-for-sale, at fair value 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 and buy-ups 0 0
Total financial assets 166,256 227,635
Financial liabilities [Abstract]    
Derivative liabilities at fair value 0 0
Guaranty obligations 0 0
Total financial liabilities 0 0
Significant Other Observable Inputs (Level 2)    
Financial assets [Abstract]    
Cash and cash equivalents, including restricted cash and cash equivalents 59,400 18,444
Federal funds sold and securities purchased under agreements to resell or similar arrangements 27,610 28,200
Trading securities 4,888 5,991
Available-for-sale, at fair value 90 1,049
Mortgage loans held for sale 2,250 116
Mortgage loans held for investment, net of allowance for loan losses 3,745,286 3,512,672
Advances to lenders 9,923 10,448
Derivative assets at fair value 940 1,748
Guaranty assets and buy-ups 0 0
Total financial assets 3,850,387 3,578,668
Financial liabilities [Abstract]    
Derivative liabilities at fair value 1,440 2,441
Guaranty obligations 0 0
Total financial liabilities 4,182,586 4,059,705
Significant Unobservable Inputs (Level 3)    
Financial assets [Abstract]    
Cash and cash equivalents, including restricted cash and cash equivalents 0 0
Federal funds sold and securities purchased under agreements to resell or similar arrangements 0 0
Trading securities 129 95
Available-for-sale, at fair value 796 648
Mortgage loans held for sale 6,129 5,502
Mortgage loans held for investment, net of allowance for loan losses 220,358 255,556
Advances to lenders 1 1
Derivative assets at fair value 159 382
Guaranty assets and buy-ups 234 258
Total financial assets 227,806 262,442
Financial liabilities [Abstract]    
Derivative liabilities at fair value 20 49
Guaranty obligations 86 82
Total financial liabilities 31,834 32,593
Fannie Mae    
Financial liabilities [Abstract]    
Long-term debt 2,633 3,728
Fannie Mae | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase 0  
Short-term debt: 0 0
Long-term debt 0 0
Fannie Mae | Significant Other Observable Inputs (Level 2)    
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase 363  
Short-term debt: 8,045 12,177
Long-term debt 235,120 288,414
Fannie Mae | Significant Unobservable Inputs (Level 3)    
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase 0  
Short-term debt: 0 0
Long-term debt 814 878
Consolidated Trusts    
Financial liabilities [Abstract]    
Long-term debt 23,020 24,586
Consolidated Trusts | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial liabilities [Abstract]    
Long-term debt 0 0
Consolidated Trusts | Significant Other Observable Inputs (Level 2)    
Financial liabilities [Abstract]    
Long-term debt 3,937,618 3,756,673
Consolidated Trusts | Significant Unobservable Inputs (Level 3)    
Financial liabilities [Abstract]    
Long-term debt 30,914 31,584
Carrying Amount    
Financial assets [Abstract]    
Cash and cash equivalents, including restricted cash and cash equivalents 133,464 115,623
Federal funds sold and securities purchased under agreements to resell or similar arrangements 27,610 28,200
Trading securities 97,209 136,542
Available-for-sale, at fair value 886 1,697
Mortgage loans held for sale 7,489 5,197
Mortgage loans held for investment, net of allowance for loan losses 3,896,180 3,648,695
Advances to lenders 9,924 10,449
Derivative assets at fair value 809 1,225
Guaranty assets and buy-ups 97 115
Total financial assets 4,173,668 3,947,743
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase 363  
Derivative liabilities at fair value 622 1,495
Guaranty obligations 108 127
Total financial liabilities 4,143,562 3,937,358
Carrying Amount | Fannie Mae    
Financial liabilities [Abstract]    
Short-term debt: 8,045 12,173
Long-term debt 226,798 277,399
Carrying Amount | Consolidated Trusts    
Financial liabilities [Abstract]    
Long-term debt 3,907,626 3,646,164
Fair Value    
Financial assets [Abstract]    
Cash and cash equivalents, including restricted cash and cash equivalents 133,464 115,623
Federal funds sold and securities purchased under agreements to resell or similar arrangements 27,610 28,200
Trading securities 97,209 136,542
Available-for-sale, at fair value 886 1,697
Mortgage loans held for sale 8,379 5,618
Mortgage loans held for investment, net of allowance for loan losses 3,965,644 3,768,228
Advances to lenders 9,924 10,449
Derivative assets at fair value 809 1,225
Guaranty assets and buy-ups 234 258
Total financial assets 4,244,159 4,067,840
Financial liabilities [Abstract]    
Derivative liabilities at fair value 622 1,495
Guaranty obligations 86 82
Total financial liabilities 4,213,582 4,091,303
Fair Value | Fannie Mae    
Financial liabilities [Abstract]    
Federal funds purchased and securities sold under agreements to repurchase 363  
Short-term debt: 8,045 12,177
Long-term debt 235,934 289,292
Fair Value | Consolidated Trusts    
Financial liabilities [Abstract]    
Long-term debt $ 3,968,532 $ 3,788,257