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Fair Value Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Fair Value Measurement [Domain]    
Financial assets [Abstract]    
Derivative assets, gross amount offset $ (2,108) $ (1,288)
Financial liabilities [Abstract]    
Derivative liabilities, gross amount offset (2,396) (1,694)
Mortgage loans held for investment, at fair value 7,303 7,825
Derivative assets, gross amount offset (2,108) (1,288)
Derivative liabilities, gross amount offset (2,396) (1,694)
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 106,949 50,057
Federal funds sold and securities purchased under agreements to resell or similar arrangements 0 0
Trading securities 96,037 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 202,986 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 13,275 11,350
Federal funds sold and securities purchased under agreements to resell or similar arrangements 25,450 13,578
Trading securities 10,571 8,576
Available-for-sale securities 1,140 1,612
Mortgage loans held for sale 110 229
Mortgage loans held for investment, at fair value 3,400,773 3,270,535
Advances to lenders 7,982 6,451
Derivatives assets at fair value 2,698 1,360
Guaranty assets and buy-ups 0 0
Total financial assets 3,461,999 3,313,691
Financial liabilities [Abstract]    
Derivative liabilities at fair value 3,731 2,092
Guaranty obligations 0 0
Total financial liabilities 3,856,250 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 136 46
Available-for-sale securities 980 792
Mortgage loans held for sale 7,892 7,054
Mortgage loans held for investment, at fair value 195,726 127,650
Advances to lenders 1 2
Derivatives assets at fair value 314 199
Guaranty assets and buy-ups 260 305
Total financial assets 205,309 136,048
Financial liabilities [Abstract]    
Derivative liabilities at fair value 45 37
Guaranty obligations 85 97
Total financial liabilities 32,723 32,362
Fannie Mae [Member]    
Financial liabilities [Abstract]    
Long-term debt 4,546 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 42,269 26,667
Long-term debt 244,967 164,144
Fannie Mae [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 860 401
Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Long-term debt 23,883 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 3,565,283 3,312,763
Consolidated Trusts [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Financial liabilities [Abstract]    
Long-term debt 31,733 31,827
Carrying Value [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 120,224 61,407
Federal funds sold and securities purchased under agreements to resell or similar arrangements 25,450 13,578
Trading securities 106,744 48,123
Available-for-sale securities 2,120 2,404
Mortgage loans held for sale 7,580 6,773
Mortgage loans held for investment, at fair value 3,451,755 3,327,389
Advances to lenders 7,983 6,453
Derivatives assets at fair value 904 271
Guaranty assets and buy-ups 120 142
Total financial assets 3,722,880 3,466,540
Financial liabilities [Abstract]    
Derivative liabilities at fair value 1,380 435
Guaranty obligations 133 154
Total financial liabilities 3,721,488 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 42,250 26,662
Long-term debt 233,387 155,585
Carrying Value [Member] | Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Long-term debt 3,444,338 3,285,139
Estimated of Fair Value [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 120,224 61,407
Federal funds sold and securities purchased under agreements to resell or similar arrangements 25,450 13,578
Trading securities 106,744 48,123
Available-for-sale securities 2,120 2,404
Mortgage loans held for sale 8,002 7,283
Mortgage loans held for investment, at fair value 3,596,499 3,398,185
Advances to lenders 7,983 6,453
Derivatives assets at fair value 904 271
Guaranty assets and buy-ups 260 305
Total financial assets 3,868,186 3,538,009
Financial liabilities [Abstract]    
Derivative liabilities at fair value 1,380 435
Guaranty obligations 85 97
Total financial liabilities 3,886,577 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 42,269 26,667
Long-term debt 245,827 164,545
Estimated of Fair Value [Member] | Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Long-term debt $ 3,597,016 $ 3,344,590