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Long-Term Debt (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 3,226,737 $ 3,125,721
Long-term debt, weighted-average interest rate 2.54% 2.88%
Fannie Mae [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 292,102 $ 315,128
Long-term debt, weighted-average interest rate 2.31% 2.41%
Net unamortized discount, fair value adjustments and other cost basis adjustments $ 1,800 $ 3,200
Fannie Mae [Member] | Senior Fixed [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 249,013 $ 278,826
Long-term debt, weighted-average interest rate 2.14% 2.39%
Fannie Mae [Member] | Senior Fixed Benchmark Notes and Bonds [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 153,983 $ 154,057
Long-term debt, weighted-average interest rate 2.16% 2.49%
Fannie Mae [Member] | Senior Fixed Medium-Term Notes [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 82,230 $ 96,997
Long-term debt, weighted-average interest rate 1.40% 1.53%
Fannie Mae [Member] | Senior Fixed Other Debt [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 12,800 $ 27,772
Long-term debt, weighted-average interest rate 6.74% 4.88%
Fannie Mae [Member] | Senior floating [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 38,333 $ 31,923
Long-term debt, weighted-average interest rate 2.48% 1.58%
Fannie Mae [Member] | Senior Floating Medium-Term Notes [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 21,476 $ 20,791
Long-term debt, weighted-average interest rate 0.71% 0.27%
Fannie Mae [Member] | Senior Floating Connecticut Avenue Security [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 16,511 $ 10,764
Long-term debt, weighted-average interest rate 4.77% 3.84%
Fannie Mae [Member] | Senior Floating Other Debt [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 346 $ 368
Long-term debt, weighted-average interest rate 6.75% 10.46%
Fannie Mae [Member] | Subordinated Debentures [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 4,645 $ 4,227
Long-term debt, weighted-average interest rate 9.93% 9.93%
Fannie Mae [Member] | Secured Borrowings [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 111 $ 152
Long-term debt, weighted-average interest rate 1.44% 1.47%
Consolidated Trusts [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 2,934,635 $ 2,810,593
Long-term debt, weighted-average interest rate 2.57% 2.94%
Minimum [Member] | Fannie Mae [Member]    
Long-Term Debt [Line Items]    
Medium-term notes original contractual maturity 1 year 1 year
Long-term debt original contractual maturity greater than 10 years 10 years 10 years
Maximum [Member] | Fannie Mae [Member]    
Long-Term Debt [Line Items]    
Medium-term notes original contractual maturity 10 years 10 years