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Short-Term Borrowings and Long-Term Debt Long-term Debt (Details) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Long-Term Debt [Line Items]    
Outstanding $ 3,067,074,000,000 $ 3,038,147,000,000
Weighted-average interest rate 3.61% [1] 3.84% [1]
Fannie Mae [Member]
   
Long-Term Debt [Line Items]    
Outstanding 566,483,000,000 [2] 585,692,000,000 [2]
Weighted-average interest rate 2.19% [1],[2] 2.42% [1],[2]
Net discount and other cost basis adjustments 7,500,000,000 [2] 9,200,000,000 [2]
Fannie Mae [Member] | Senior Fixed [Member]
   
Long-Term Debt [Line Items]    
Outstanding 480,741,000,000 505,606,000,000
Weighted-average interest rate 2.41% [1] 2.64% [1]
Fannie Mae [Member] | Senior Fixed Benchmark Notes and Bonds [Member]
   
Long-Term Debt [Line Items]    
Outstanding 267,347,000,000 277,146,000,000
Weighted-average interest rate 2.63% [1] 2.81% [1]
Fannie Mae [Member] | Senior Fixed Medium-Term Notes [Member]
   
Long-Term Debt [Line Items]    
Outstanding 172,877,000,000 [3] 176,886,000,000 [3]
Weighted-average interest rate 1.40% [1],[3] 1.61% [1],[3]
Fannie Mae [Member] | Senior Fixed Foreign Exchange Notes and Bonds [Member]
   
Long-Term Debt [Line Items]    
Outstanding 669,000,000 662,000,000
Weighted-average interest rate 5.27% [1] 5.44% [1]
Fannie Mae [Member] | Senior Fixed Other Debt [Member]
   
Long-Term Debt [Line Items]    
Outstanding 39,848,000,000 [4],[5] 50,912,000,000 [4],[5]
Weighted-average interest rate 5.27% [1],[4],[5] 5.29% [1],[4],[5]
Fannie Mae [Member] | Senior Floating [Member]
   
Long-Term Debt [Line Items]    
Outstanding 77,403,000,000 72,275,000,000
Weighted-average interest rate 0.34% [1] 0.35% [1]
Fannie Mae [Member] | Senior Foating Medium-Term Notes [Member]
   
Long-Term Debt [Line Items]    
Outstanding 77,026,000,000 [3] 71,855,000,000 [3]
Weighted-average interest rate 0.31% [1],[3] 0.32% [1],[3]
Fannie Mae [Member] | Senior Floating Other Debt [Member]
   
Long-Term Debt [Line Items]    
Outstanding 377,000,000 [4],[5] 420,000,000 [4],[5]
Weighted-average interest rate 8.63% [1],[4],[5] 8.01% [1],[4],[5]
Fannie Mae [Member] | Subordinated Fixed [Member]
   
Long-Term Debt [Line Items]    
Outstanding 7,948,000,000 7,811,000,000
Weighted-average interest rate 6.94% [1] 6.88% [1]
Fannie Mae [Member] | Subordinated Fixed Qualifying Subordinated [Member]
   
Long-Term Debt [Line Items]    
Outstanding 4,894,000,000 [6] 4,894,000,000 [6]
Weighted-average interest rate 5.08% [1],[6] 5.08% [1],[6]
Fannie Mae [Member] | Subordinated Fixed Subordinated Debentures [Member]
   
Long-Term Debt [Line Items]    
Outstanding 3,054,000,000 2,917,000,000
Weighted-average interest rate 9.91% [1] 9.91% [1]
Fannie Mae [Member] | Secured Borrowings [Member]
   
Long-Term Debt [Line Items]    
Outstanding 391,000,000 [7] 0 [7]
Weighted-average interest rate 1.87% [1],[7] 0.00% [1],[7]
Consolidated Trusts [Member]
   
Long-Term Debt [Line Items]    
Outstanding $ 2,500,591,000,000 [4] $ 2,452,455,000,000 [4]
Weighted-average interest rate 3.93% [1],[4] 4.18% [1],[4]
Minimum [Member] | Fannie Mae [Member]
   
Long-Term Debt [Line Items]    
Medium-term notes original contractual maturity 1 year [3] 1 year [3]
Maximum [Member] | Fannie Mae [Member]
   
Long-Term Debt [Line Items]    
Medium-term notes original contractual maturity 10 years [3] 10 years [3]
[1] Includes the effects of discounts, premiums and other cost basis adjustments.
[2] Reported amounts include a net discount and other cost basis adjustments of $7.5 billion and $9.2 billion as of June 30, 2012 and December 31, 2011, 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 remaining liability for transfer of financial assets from our condensed consolidated balance sheets that did not qualify as a sale.