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Short-Term Borrowings and Long-Term Debt Long-term Debt (Details) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 3,127,347,000,000 $ 3,160,074,000,000
Long-term debt, weighted-average interest rate 3.13% [1] 3.10% [1]
Fannie Mae [Member]
   
Long-Term Debt [Line Items]    
Long-term debt, outstanding 416,405,000,000 [2] 457,139,000,000 [2]
Long-term debt, weighted-average interest rate 2.16% [1],[2] 2.14% [1],[2]
Unamortized discount, fair value adjustments and other cost basis adjustments 4,500,000,000 4,800,000,000
Fannie Mae [Member] | Senior Fixed [Member]
   
Long-Term Debt [Line Items]    
Long-term debt, outstanding 373,303,000,000 412,805,000,000
Long-term debt, weighted-average interest rate 2.28% [1] 2.24% [1]
Fannie Mae [Member] | Senior Fixed Benchmark Notes and Bonds [Member]
   
Long-Term Debt [Line Items]    
Long-term debt, outstanding 197,233,000,000 212,234,000,000
Long-term debt, weighted-average interest rate 2.42% [1] 2.45% [1]
Fannie Mae [Member] | Senior Fixed Medium-Term Notes [Member]
   
Long-Term Debt [Line Items]    
Long-term debt, outstanding 137,654,000,000 [3] 161,445,000,000 [3]
Long-term debt, weighted-average interest rate 1.33% [1],[3] 1.28% [1],[3]
Fannie Mae [Member] | Senior Fixed Foreign Exchange Notes and Bonds [Member]
   
Long-Term Debt [Line Items]    
Long-term debt, outstanding 662,000,000 682,000,000
Long-term debt, weighted-average interest rate 5.40% [1] 5.41% [1]
Fannie Mae [Member] | Senior Fixed Other Debt [Member]
   
Long-Term Debt [Line Items]    
Long-term debt, outstanding 37,754,000,000 [4] 38,444,000,000 [4]
Long-term debt, weighted-average interest rate 4.96% [1],[4] 4.99% [1],[4]
Fannie Mae [Member] | Senior Floating [Member]
   
Long-Term Debt [Line Items]    
Long-term debt, outstanding 39,267,000,000 39,396,000,000
Long-term debt, weighted-average interest rate 0.35% [1] 0.32% [1]
Fannie Mae [Member] | Senior Floating Medium-Term Notes [Member]
   
Long-Term Debt [Line Items]    
Long-term debt, outstanding 37,492,000,000 [3] 38,441,000,000 [3]
Long-term debt, weighted-average interest rate 0.18% [1],[3] 0.20% [1],[3]
Fannie Mae [Member] | Senior Floating Other Debt [Member]
   
Long-Term Debt [Line Items]    
Long-term debt, outstanding 1,775,000,000 [4],[5] 955,000,000 [4],[5]
Long-term debt, weighted-average interest rate 4.19% [1],[4],[5] 5.18% [1],[4],[5]
Fannie Mae [Member] | Subordinated Fixed [Member]
   
Long-Term Debt [Line Items]    
Long-term debt, outstanding 3,589,000,000 4,676,000,000
Long-term debt, weighted-average interest rate 9.92% [1] 8.76% [1]
Fannie Mae [Member] | Subordinated Fixed Qualifying Subordinated [Member]
   
Long-Term Debt [Line Items]    
Long-term debt, outstanding 0 1,169,000,000
Long-term debt, weighted-average interest rate 0.00% [1] 5.27% [1]
Fannie Mae [Member] | Subordinated Fixed Subordinated Debentures [Member]
   
Long-Term Debt [Line Items]    
Long-term debt, outstanding 3,589,000,000 [6] 3,507,000,000 [6]
Long-term debt, weighted-average interest rate 9.92% [1],[6] 9.92% [1],[6]
Fannie Mae [Member] | Secured Borrowings [Member]
   
Long-Term Debt [Line Items]    
Long-term debt, outstanding 246,000,000 [7] 262,000,000 [7]
Long-term debt, weighted-average interest rate 1.87% [1],[7] 1.86% [1],[7]
Consolidated Trusts [Member]
   
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 2,710,942,000,000 [4] $ 2,702,935,000,000 [4]
Long-term debt, weighted-average interest rate 3.28% [1],[4] 3.26% [1],[4]
Minimum [Member] | Fannie Mae [Member]
   
Long-Term Debt [Line Items]    
Medium-term notes original contractual maturity 1 year 1 year
Maximum [Member] | Fannie Mae [Member]
   
Long-Term Debt [Line Items]    
Medium-term notes original contractual maturity 10 years 10 years
[1] Includes the effects of discounts, premiums and other cost basis adjustments.
[2] Reported amounts include unamortized discounts and premiums, other cost basis adjustments and fair value adjustments of $4.5 billion and $4.8 billion as of March 31, 2014 and December 31, 2013, respectively.
[3] Includes long-term debt with an original contractual maturity of greater than 1 year and up to 10 years, excluding zero-coupon debt.
[4] Includes a portion of structured debt instruments that is reported at fair value.
[5] Includes credit risk sharing securities issued under our Connecticut Avenue Securities series, which transfers some of the credit risk of our mortgage loans to the investors in these securities.
[6] Consists of subordinated debt issued with an interest deferral feature.
[7] Represents our remaining liability resulting from the transfer of financial assets from our condensed consolidated balance sheets that did not qualify as a sale under the accounting guidance for the transfer of financial instruments.