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Short-Term Borrowings and Long-Term Debt Long-term Debt (Details) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Long-Term Debt [Line Items]    
Long-term Debt, Outstanding $ 3,134,924,000,000 $ 3,080,801,000,000
Weighted-average interest rate 2.92% [1] 3.18% [1]
Fannie Mae [Member]
   
Long-Term Debt [Line Items]    
Long-term Debt, Outstanding 500,441,000,000 [2] 510,631,000,000 [2]
Weighted-average interest rate 2.08% [1],[2] 2.25% [1],[2]
Net discount, fair value adjustments and other cost basis adjustments 5,300,000,000 6,000,000,000
Fannie Mae [Member] | Senior Fixed [Member]
   
Long-Term Debt [Line Items]    
Long-term Debt, Outstanding 453,895,000,000 465,569,000,000
Weighted-average interest rate 2.18% [1] 2.35% [1]
Fannie Mae [Member] | Senior Fixed Benchmark Notes and Bonds [Member]
   
Long-Term Debt [Line Items]    
Long-term Debt, Outstanding 239,022,000,000 251,768,000,000
Weighted-average interest rate 2.43% [1] 2.59% [1]
Fannie Mae [Member] | Senior Fixed Medium-Term Notes [Member]
   
Long-Term Debt [Line Items]    
Long-term Debt, Outstanding 175,546,000,000 [3] 172,288,000,000 [3]
Weighted-average interest rate 1.23% [1],[3] 1.35% [1],[3]
Fannie Mae [Member] | Senior Fixed Foreign Exchange Notes and Bonds [Member]
   
Long-Term Debt [Line Items]    
Long-term Debt, Outstanding 649,000,000 694,000,000
Weighted-average interest rate 5.36% [1] 5.44% [1]
Fannie Mae [Member] | Senior Fixed Other Debt [Member]
   
Long-Term Debt [Line Items]    
Long-term Debt, Outstanding 38,678,000,000 [4],[5] 40,819,000,000 [4],[5]
Weighted-average interest rate 4.93% [1],[4],[5] 4.99% [1],[4],[5]
Fannie Mae [Member] | Senior Floating [Member]
   
Long-Term Debt [Line Items]    
Long-term Debt, Outstanding 41,730,000,000 38,998,000,000
Weighted-average interest rate 0.28% [1] 0.33% [1]
Fannie Mae [Member] | Senior Foating Medium-Term Notes [Member]
   
Long-Term Debt [Line Items]    
Long-term Debt, Outstanding 41,428,000,000 [3] 38,633,000,000 [3]
Weighted-average interest rate 0.23% [1],[3] 0.27% [1],[3]
Fannie Mae [Member] | Senior Floating Other Debt [Member]
   
Long-Term Debt [Line Items]    
Long-term Debt, Outstanding 302,000,000 [4],[5] 365,000,000 [4],[5]
Weighted-average interest rate 8.20% [1],[4],[5] 8.22% [1],[4],[5]
Fannie Mae [Member] | Subordinated Fixed [Member]
   
Long-Term Debt [Line Items]    
Long-term Debt, Outstanding 4,516,000,000 5,719,000,000
Weighted-average interest rate 8.72% [1] 7.75% [1]
Fannie Mae [Member] | Subordinated Fixed Qualifying Subordinated [Member]
   
Long-Term Debt [Line Items]    
Long-term Debt, Outstanding 1,168,000,000 2,522,000,000
Weighted-average interest rate 5.27% [1] 5.00% [1]
Fannie Mae [Member] | Subordinated Fixed Subordinated Debentures [Member]
   
Long-Term Debt [Line Items]    
Long-term Debt, Outstanding 3,348,000,000 [6] 3,197,000,000 [6]
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 300,000,000 [7] 345,000,000 [7]
Weighted-average interest rate 1.86% [1],[7] 1.87% [1],[7]
Consolidated Trusts [Member]
   
Long-Term Debt [Line Items]    
Long-term Debt, Outstanding $ 2,634,483,000,000 [4] $ 2,570,170,000,000 [4]
Weighted-average interest rate 3.08% [1],[4] 3.36% [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 a net unamortized discount, fair value adjustments and other cost basis adjustments of $5.3 billion and $6.0 billion as of June 30, 2013 and December 31, 2012, 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 long-term debt that is not included in other debt categories.
[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.