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Fair Value Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Fair Value Measurement [Domain]    
Financial assets [Abstract]    
Derivative assets, gross amount offset $ (655) $ (905)
Financial liabilities [Abstract]    
Derivative liabilities, gross amount offset (1,632) (995)
Mortgage loans held for investment, at fair value 6,048 6,490
Derivative assets, gross amount offset (655) (905)
Derivative liabilities, gross amount offset (1,632) (995)
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 102,841 97,179
Federal funds sold and securities purchased under agreements to resell or similar arrangements 0 0
Trading securities 105,601 130,456
Available-for-sale securities 0 0
Mortgage loans held for sale 0 0
Mortgage loans held for investment, at fair value 0 0
Advances to lenders 0 0
Derivatives assets at fair value 0 0
Guaranty assets and buy-ups 0 0
Total financial assets 208,442 227,635
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) [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 11,500 18,444
Federal funds sold and securities purchased under agreements to resell or similar arrangements 54,937 28,200
Trading securities 5,546 5,991
Available-for-sale securities 891 1,049
Mortgage loans held for sale 3,511 116
Mortgage loans held for investment, at fair value 3,549,337 3,512,672
Advances to lenders 10,571 10,448
Derivatives assets at fair value 3,115 1,748
Guaranty assets and buy-ups 0 0
Total financial assets 3,639,408 3,578,668
Financial liabilities [Abstract]    
Derivative liabilities at fair value 3,692 2,441
Guaranty obligations 0 0
Total financial liabilities 4,062,768 4,059,705
Significant Unobservable Inputs (Level 3) [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 0 0
Federal funds sold and securities purchased under agreements to resell or similar arrangements 0 0
Trading securities 109 95
Available-for-sale securities 611 648
Mortgage loans held for sale 5,122 5,502
Mortgage loans held for investment, at fair value 245,916 255,556
Advances to lenders 1 1
Derivatives assets at fair value 212 382
Guaranty assets and buy-ups 242 258
Total financial assets 252,213 262,442
Financial liabilities [Abstract]    
Derivative liabilities at fair value 46 49
Guaranty obligations 75 82
Total financial liabilities 31,939 32,593
Fannie Mae [Member]    
Financial liabilities [Abstract]    
Long-term debt 3,336 3,728
Fannie Mae [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 0 0
Fannie Mae [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Financial liabilities [Abstract]    
Short-term debt 2,857 12,177
Long-term debt 279,208 288,414
Fannie Mae [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 828 878
Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Long-term debt 23,601 24,586
Consolidated Trusts [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial liabilities [Abstract]    
Long-term debt 0 0
Consolidated Trusts [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Financial liabilities [Abstract]    
Long-term debt 3,777,011 3,756,673
Consolidated Trusts [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Financial liabilities [Abstract]    
Long-term debt 30,990 31,584
Carrying Value [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 114,341 115,623
Federal funds sold and securities purchased under agreements to resell or similar arrangements 54,937 28,200
Trading securities 111,256 136,542
Available-for-sale securities 1,502 1,697
Mortgage loans held for sale 7,824 5,197
Mortgage loans held for investment, at fair value 3,732,056 3,648,695
Advances to lenders 10,572 10,449
Derivatives assets at fair value 2,672 1,225
Guaranty assets and buy-ups 109 115
Total financial assets 4,035,269 3,947,743
Financial liabilities [Abstract]    
Derivative liabilities at fair value 2,106 1,495
Guaranty obligations 120 127
Total financial liabilities 4,016,206 3,937,358
Carrying Value [Member] | Fannie Mae [Member]    
Financial liabilities [Abstract]    
Short-term debt 2,857 12,173
Long-term debt 270,585 277,399
Carrying Value [Member] | Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Long-term debt 3,740,538 3,646,164
Estimated of Fair Value [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 114,341 115,623
Federal funds sold and securities purchased under agreements to resell or similar arrangements 54,937 28,200
Trading securities 111,256 136,542
Available-for-sale securities 1,502 1,697
Mortgage loans held for sale 8,633 5,618
Mortgage loans held for investment, at fair value 3,795,253 3,768,228
Advances to lenders 10,572 10,449
Derivatives assets at fair value 2,672 1,225
Guaranty assets and buy-ups 242 258
Total financial assets 4,099,408 4,067,840
Financial liabilities [Abstract]    
Derivative liabilities at fair value 2,106 1,495
Guaranty obligations 75 82
Total financial liabilities 4,093,075 4,091,303
Estimated of Fair Value [Member] | Fannie Mae [Member]    
Financial liabilities [Abstract]    
Short-term debt 2,857 12,177
Long-term debt 280,036 289,292
Estimated of Fair Value [Member] | Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Long-term debt $ 3,808,001 $ 3,788,257