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Short-Term Borrowings and Long-Term Debt Characteristics of Debt (Details) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Long-term Debt by Year of Maturity [Abstract]    
Total long-term debt $ 3,160,074,000,000 [1] $ 3,080,801,000,000
Fannie Mae [Member]
   
Long-Term Debt [Line Items]    
Face amount 534,300,000,000 621,800,000,000
Long-term Debt by Year of Maturity [Abstract]    
2014 89,844,000,000  
2015 70,896,000,000  
2016 80,015,000,000  
2017 81,896,000,000  
2018 52,098,000,000  
Thereafter 82,390,000,000  
Total long-term debt 457,139,000,000 [2],[3] 510,631,000,000 [2]
Net unamortized discount, fair value adjustments and other cost basis adjustments 4,800,000,000 6,000,000,000
Fannie Mae [Member] | Zero-Coupon Debt [Member]
   
Long-Term Debt [Line Items]    
Face amount 86,800,000,000 120,700,000,000
Effective interest rate 1.29% 0.93%
Consolidated Trusts [Member]
   
Long-term Debt by Year of Maturity [Abstract]    
Total long-term debt 2,702,935,000,000 [1],[4] 2,570,170,000,000 [1]
Callable [Member] | Fannie Mae [Member]
   
Long-Term Debt [Line Items]    
Outstanding debt 168,400,000,000 177,800,000,000
Assuming Callable Debt Redeemed at Next Available Call Date [Member]
   
Long-term Debt by Year of Maturity [Abstract]    
Total long-term debt 3,160,074,000,000 [1]  
Assuming Callable Debt Redeemed at Next Available Call Date [Member] | Fannie Mae [Member]
   
Long-term Debt by Year of Maturity [Abstract]    
2014 246,234,000,000  
2015 73,214,000,000  
2016 48,931,000,000  
2017 44,430,000,000  
2018 20,813,000,000  
Thereafter 23,517,000,000  
Total long-term debt 457,139,000,000 [3]  
Assuming Callable Debt Redeemed at Next Available Call Date [Member] | Consolidated Trusts [Member]
   
Long-term Debt by Year of Maturity [Abstract]    
Total long-term debt $ 2,702,935,000,000 [4]  
[1] Includes a portion of structured debt instruments that is reported at fair value.
[2] Reported amounts include a net unamortized discount, fair value adjustments and other cost basis adjustments of $4.8 billion and $6.0 billion as of December 31, 2013 and 2012, respectively.
[3] Reported amount includes a net unamortized discount, fair value adjustments and other cost basis adjustments of $4.8 billion.
[4] Contractual maturity of debt of consolidated trusts is not a reliable indicator of expected maturity because borrowers of the underlying loans generally have the right to prepay their obligations at any time.