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Short-Term Borrowings and Long-Term Debt Long-term Debt (Details) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 3,160,074,000,000 [1] $ 3,080,801,000,000
Long-term debt, weighted-average interest rate 3.10% [2] 3.18% [2]
Fannie Mae [Member]
   
Long-Term Debt [Line Items]    
Long-term debt, outstanding 457,139,000,000 [3],[4] 510,631,000,000 [3]
Long-term debt, weighted-average interest rate 2.14% [2],[3] 2.25% [2],[3]
Net unamortized discount, fair value adjustments and other cost basis adjustments 4,800,000,000 6,000,000,000
Fannie Mae [Member] | Senior Fixed [Member]
   
Long-Term Debt [Line Items]    
Long-term debt, outstanding 412,805,000,000 465,569,000,000
Long-term debt, weighted-average interest rate 2.24% [2] 2.35% [2]
Fannie Mae [Member] | Senior Fixed Benchmark Notes and Bonds [Member]
   
Long-Term Debt [Line Items]    
Long-term debt, outstanding 212,234,000,000 251,768,000,000
Long-term debt, weighted-average interest rate 2.45% [2] 2.59% [2]
Fannie Mae [Member] | Senior Fixed Medium-Term Notes [Member]
   
Long-Term Debt [Line Items]    
Long-term debt, outstanding 161,445,000,000 [5] 172,288,000,000 [5]
Long-term debt, weighted-average interest rate 1.28% [2],[5] 1.35% [2],[5]
Fannie Mae [Member] | Senior Fixed Foreign Exchange Notes and Bonds [Member]
   
Long-Term Debt [Line Items]    
Long-term debt, outstanding 682,000,000 694,000,000
Long-term debt, weighted-average interest rate 5.41% [2] 5.44% [2]
Fannie Mae [Member] | Senior Fixed Other Debt [Member]
   
Long-Term Debt [Line Items]    
Long-term debt, outstanding 38,444,000,000 [1],[6] 40,819,000,000 [1],[6]
Long-term debt, weighted-average interest rate 4.99% [1],[2],[6] 4.99% [1],[2],[6]
Fannie Mae [Member] | Senior Floating [Member]
   
Long-Term Debt [Line Items]    
Long-term debt, outstanding 39,396,000,000 38,998,000,000
Long-term debt, weighted-average interest rate 0.32% [2] 0.33% [2]
Fannie Mae [Member] | Senior Floating Medium-Term Notes [Member]
   
Long-Term Debt [Line Items]    
Long-term debt, outstanding 38,441,000,000 [5] 38,633,000,000 [5]
Long-term debt, weighted-average interest rate 0.20% [2],[5] 0.27% [2],[5]
Fannie Mae [Member] | Senior Floating Other Debt [Member]
   
Long-Term Debt [Line Items]    
Long-term debt, outstanding 955,000,000 [1],[6] 365,000,000 [1],[6]
Long-term debt, weighted-average interest rate 5.18% [1],[2],[6] 8.22% [1],[2],[6]
Fannie Mae [Member] | Subordinated Fixed [Member]
   
Long-Term Debt [Line Items]    
Long-term debt, outstanding 4,676,000,000 5,719,000,000
Long-term debt, weighted-average interest rate 8.76% [2] 7.75% [2]
Fannie Mae [Member] | Subordinated Fixed Qualifying Subordinated [Member]
   
Long-Term Debt [Line Items]    
Long-term debt, outstanding 1,169,000,000 2,522,000,000
Long-term debt, weighted-average interest rate 5.27% [2] 5.00% [2]
Fannie Mae [Member] | Subordinated Fixed Subordinated Debentures [Member]
   
Long-Term Debt [Line Items]    
Long-term debt, outstanding 3,507,000,000 [7] 3,197,000,000 [7]
Long-term debt, weighted-average interest rate 9.92% [2],[7] 9.92% [2],[7]
Fannie Mae [Member] | Secured Borrowings [Member]
   
Long-Term Debt [Line Items]    
Long-term debt, outstanding 262,000,000 [8] 345,000,000 [8]
Long-term debt, weighted-average interest rate 1.86% [2],[8] 1.87% [2],[8]
Consolidated Trusts [Member]
   
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 2,702,935,000,000 [1],[9] $ 2,570,170,000,000 [1]
Long-term debt, weighted-average interest rate 3.26% [1],[2] 3.36% [1],[2]
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 a portion of structured debt instruments that is reported at fair value.
[2] Includes the effects of discounts, premiums and other cost basis adjustments.
[3] 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.
[4] Reported amount includes a net unamortized discount, fair value adjustments and other cost basis adjustments of $4.8 billion.
[5] Includes long-term debt with an original contractual maturity of greater than 1 year and up to 10 years, excluding zero-coupon debt.
[6] Includes long-term debt that is not included in other debt categories.
[7] Consists of subordinated debt issued with an interest deferral feature.
[8] Represents our remaining liability resulting from the transfer of financial assets from our consolidated balance sheets that did not qualify as a sale under the accounting guidance for the transfer of financial instruments.
[9] 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.