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Fair Value Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Fair Value Measurement [Domain]    
Financial assets [Abstract]    
Derivative assets, gross amount offset $ (2,037) $ (1,288)
Financial liabilities [Abstract]    
Derivative liabilities, gross amount offset (2,053) (1,694)
Mortgage loans held for investment, at fair value 6,968 7,825
Derivative assets, gross amount offset (2,037) (1,288)
Derivative liabilities, gross amount offset (2,053) (1,694)
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 96,588 50,057
Federal funds sold and securities purchased under agreements to resell or similar arrangements 0 0
Trading securities 135,972 39,501
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 232,560 89,558
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 14,400 11,350
Federal funds sold and securities purchased under agreements to resell or similar arrangements 12,700 13,578
Trading securities 6,439 8,576
Available-for-sale securities 1,168 1,612
Mortgage loans held for sale 679 229
Mortgage loans held for investment, at fair value 3,414,104 3,270,535
Advances to lenders 10,227 6,451
Derivatives assets at fair value 2,395 1,360
Guaranty assets and buy-ups 0 0
Total financial assets 3,462,112 3,313,691
Financial liabilities [Abstract]    
Derivative liabilities at fair value 2,980 2,092
Guaranty obligations 0 0
Total financial liabilities 3,952,214 3,506,144
Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure   478
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 61 46
Available-for-sale securities 727 792
Mortgage loans held for sale 8,297 7,054
Mortgage loans held for investment, at fair value 257,448 127,650
Advances to lenders 1 2
Derivatives assets at fair value 680 199
Guaranty assets and buy-ups 270 305
Total financial assets 267,484 136,048
Financial liabilities [Abstract]    
Derivative liabilities at fair value 38 37
Guaranty obligations 78 97
Total financial liabilities 32,612 32,362
Fannie Mae [Member]    
Financial liabilities [Abstract]    
Long-term debt 3,986 5,687
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 23,536 26,667
Long-term debt 277,190 164,144
Fannie Mae [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 878 401
Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Long-term debt 24,741 21,880
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 3,648,508 3,312,763
Consolidated Trusts [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Financial liabilities [Abstract]    
Long-term debt 31,618 31,827
Carrying Value [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 110,988 61,407
Federal funds sold and securities purchased under agreements to resell or similar arrangements 12,700 13,578
Trading securities 142,472 48,123
Available-for-sale securities 1,895 2,404
Mortgage loans held for sale 8,312 6,773
Mortgage loans held for investment, at fair value 3,539,031 3,327,389
Advances to lenders 10,228 6,453
Derivatives assets at fair value 1,038 271
Guaranty assets and buy-ups 115 142
Total financial assets 3,826,779 3,466,540
Financial liabilities [Abstract]    
Derivative liabilities at fair value 965 435
Guaranty obligations 128 154
Total financial liabilities 3,820,897 3,468,453
Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure   478
Carrying Value [Member] | Fannie Mae [Member]    
Financial liabilities [Abstract]    
Short-term debt 23,526 26,662
Long-term debt 265,897 155,585
Carrying Value [Member] | Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Long-term debt 3,530,381 3,285,139
Estimated of Fair Value [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 110,988 61,407
Federal funds sold and securities purchased under agreements to resell or similar arrangements 12,700 13,578
Trading securities 142,472 48,123
Available-for-sale securities 1,895 2,404
Mortgage loans held for sale 8,976 7,283
Mortgage loans held for investment, at fair value 3,671,552 3,398,185
Advances to lenders 10,228 6,453
Derivatives assets at fair value 1,038 271
Guaranty assets and buy-ups 270 305
Total financial assets 3,960,119 3,538,009
Financial liabilities [Abstract]    
Derivative liabilities at fair value 965 435
Guaranty obligations 78 97
Total financial liabilities 3,982,773 3,536,812
Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure   478
Estimated of Fair Value [Member] | Fannie Mae [Member]    
Financial liabilities [Abstract]    
Short-term debt 23,536 26,667
Long-term debt 278,068 164,545
Estimated of Fair Value [Member] | Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Long-term debt $ 3,680,126 $ 3,344,590