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Short-Term Borrowings and Long-Term Debt Long-Term Debt (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 3,109,427 $ 3,115,583
Long-term debt, weighted-average interest rate 2.85% 2.93%
Fannie Mae [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 322,031 $ 355,431
Long-term debt, weighted-average interest rate 2.39% 2.24%
Unamortized discounts and premiums, other cost basis adjustments and fair value adjustments $ 3,400 $ 4,100
Fannie Mae [Member] | Senior Fixed [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 288,599 $ 320,507
Long-term debt, weighted-average interest rate 2.39% 2.29%
Fannie Mae [Member] | Senior fixed benchmark notes and bonds [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 159,550 $ 173,010
Long-term debt, weighted-average interest rate 2.51% 2.41%
Fannie Mae [Member] | Senior fixed medium-term notes [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 100,682 $ 114,556
Long-term debt, weighted-average interest rate 1.49% 1.42%
Fannie Mae [Member] | Senior fixed foreign exchange bonds [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 570 $ 619
Long-term debt, weighted-average interest rate 5.39% 5.44%
Fannie Mae [Member] | Senior fixed other debt [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 27,797 $ 32,322
Long-term debt, weighted-average interest rate 4.83% 4.63%
Fannie Mae [Member] | Senior Floating [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 29,140 $ 30,873
Long-term debt, weighted-average interest rate 1.36% 0.81%
Fannie Mae [Member] | Senior floating medium-term notes [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 19,164 $ 24,469
Long-term debt, weighted-average interest rate 0.22% 0.15%
Fannie Mae [Member] | Senior floating Connecticut Avenue Security [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 9,607 $ 6,041
Long-term debt, weighted-average interest rate 3.39% 2.97%
Fannie Mae [Member] | Senior floating other debt [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 369 $ 363
Long-term debt, weighted-average interest rate 8.25% 8.71%
Fannie Mae [Member] | Subordinated debentures [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 4,129 $ 3,849
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 $ 163 $ 202
Long-term debt, weighted-average interest rate 1.35% 1.90%
Fannie Mae [Member] | Minimum [Member]    
Long-Term Debt [Line Items]    
Medium-term notes original contractual maturity 1 year 1 year
Fannie Mae [Member] | Maximum [Member]    
Long-Term Debt [Line Items]    
Medium-term notes original contractual maturity 10 years 10 years
Consolidated Trusts [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 2,787,396 $ 2,760,152
Long-term debt, weighted-average interest rate 2.91% 3.02%