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Short-Term and Long-Term Debt Long-Term Debt (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 3,796,278 $ 3,440,724
Long-term debt, weighted-average interest rate 2.04% 2.78%
Consolidated Trusts [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 3,530,381 $ 3,285,139
Long-term debt, weighted-average interest rate 2.09% 2.78%
Fannie Mae [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 265,897 $ 155,585
Long-term debt, weighted-average interest rate 1.48% 2.86%
Unamortized discounts and premiums, other cost basis adjustments and fair value adjustments $ 491 $ 2
Fannie Mae [Member] | Senior Fixed [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 147,520 $ 123,958
Long-term debt, weighted-average interest rate 1.95% 2.47%
Fannie Mae [Member] | Senior fixed benchmark notes and bonds [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 104,323 $ 86,114
Long-term debt, weighted-average interest rate 2.26% 2.66%
Fannie Mae [Member] | Senior fixed medium-term notes [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 37,983 $ 32,590
Long-term debt, weighted-average interest rate 0.73% 1.57%
Fannie Mae [Member] | Senior fixed other debt [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 5,214 $ 5,254
Long-term debt, weighted-average interest rate 4.63% 5.01%
Fannie Mae [Member] | Senior floating [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 118,356 $ 31,596
Long-term debt, weighted-average interest rate 0.89% 4.40%
Fannie Mae [Member] | Senior floating medium-term notes [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 102,585 $ 9,774
Long-term debt, weighted-average interest rate 0.35% 1.66%
Fannie Mae [Member] | Senior floating Connecticut Avenue Securities [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 15,336 $ 21,424
Long-term debt, weighted-average interest rate 4.34% 5.61%
Fannie Mae [Member] | Senior floating other debt [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 435 $ 398
Long-term debt, weighted-average interest rate 5.14% 6.27%
Fannie Mae [Member] | Secured borrowings [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 21 $ 31
Long-term debt, weighted-average interest rate 3.00% 2.31%