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Short-Term Borrowings and Long-Term Debt Characteristics of Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Long-Term Debt by Year of Maturity [Abstract]    
Total long-term debt $ 3,226,737 $ 3,125,721
Fannie Mae [Member]    
Long-Term Debt [Line Items]    
Face amount 328,900 389,400
Long-Term Debt by Year of Maturity [Abstract]    
2017 68,016  
2018 55,086  
2019 63,948  
2020 29,414  
2021 24,745  
Thereafter 50,893  
Total long-term debt 292,102 315,128
Net unamortized discount, fair value adjustments and other cost basis adjustments 1,800 3,200
Fannie Mae [Member] | Zero-Coupon Debt [Member]    
Long-Term Debt [Line Items]    
Face amount $ 45,900 $ 82,100
Effective interest rate 2.43% 1.26%
Fannie Mae [Member] | Callable [Member]    
Long-Term Debt [Line Items]    
Outstanding debt $ 77,300 $ 96,200
Consolidated Trusts [Member]    
Long-Term Debt by Year of Maturity [Abstract]    
Total long-term debt 2,934,635 $ 2,810,593
Earlier of Contractual Maturity or Next Call Date [Member]    
Long-Term Debt by Year of Maturity [Abstract]    
Total long-term debt 3,226,737  
Earlier of Contractual Maturity or Next Call Date [Member] | Fannie Mae [Member]    
Long-Term Debt by Year of Maturity [Abstract]    
2017 135,025  
2018 43,451  
2019 38,348  
2020 16,734  
2021 13,357  
Thereafter 45,187  
Total long-term debt 292,102  
Earlier of Contractual Maturity or Next Call Date [Member] | Consolidated Trusts [Member]    
Long-Term Debt by Year of Maturity [Abstract]    
Total long-term debt $ 2,934,635