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Short-Term Borrowings and Long-Term Debt Short-term Debt (Details) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Short-term Borrowings [Line Items]    
Short-term debt, outstanding $ 74,449,000,000 $ 108,716,000,000
Short-term debt, Weighted-average Interest Rate 0.13% [1] 0.16% [1]
Secured Uncommitted Line of Credit [Member]
   
Short-term Borrowings [Line Items]    
Line of credit maximum borrowing capacity 20,000,000,000 15,000,000,000.0
Line of credit amount outstanding 0 0
Fannie Mae [Member]
   
Short-term Borrowings [Line Items]    
Short-term debt, outstanding 72,295,000,000 105,233,000,000
Short-term debt, Weighted-average Interest Rate 0.13% [1] 0.16% [1]
Fannie Mae [Member] | Fixed-Rate Discount Notes [Member]
   
Short-term Borrowings [Line Items]    
Short-term debt, outstanding 71,933,000,000 [2] 104,730,000,000 [2]
Short-term debt, Weighted-average Interest Rate 0.12% [1],[2] 0.15% [1],[2]
Fannie Mae [Member] | Fixed-Rate Foreign Exchange Discount Notes [Member]
   
Short-term Borrowings [Line Items]    
Short-term debt, outstanding 362,000,000 [3] 503,000,000 [3]
Short-term debt, Weighted-average Interest Rate 1.07% [1],[3] 1.61% [1],[3]
Consolidated Trusts [Member]
   
Short-term Borrowings [Line Items]    
Short-term debt, outstanding $ 2,154,000,000 $ 3,483,000,000
Short-term debt, Weighted-average Interest Rate 0.09% [1] 0.15% [1]
Minimum [Member] | Fannie Mae [Member] | Fixed-Rate Foreign Exchange Discount Notes [Member]
   
Short-term Borrowings [Line Items]    
Short-term debt instrument maturity 5 days 5 days
Maximum [Member] | Fannie Mae [Member] | Fixed-Rate Discount Notes [Member]
   
Short-term Borrowings [Line Items]    
Short-term debt instrument maturity 360 days 360 days
Maximum [Member] | Fannie Mae [Member] | Fixed-Rate Foreign Exchange Discount Notes [Member]
   
Short-term Borrowings [Line Items]    
Short-term debt instrument maturity 360 days 360 days
[1] Includes the effects of discounts, premiums and other cost basis adjustments.
[2] Represents unsecured general obligations with maturities ranging from overnight to 360 days from the date of issuance.
[3] Represents foreign exchange discount notes we issue in the Euro commercial paper market with maturities ranging from 5 to 360 days which enable investors to hold short-term investments in different currencies. We do not incur foreign exchange risk on these transactions, as we simultaneously enter into foreign currency swaps that have the effect of converting debt that we issue in foreign denominated currencies into U.S. dollars.