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Commitments and Contingencies (Details) (USD $)
12 Months Ended 0 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2008
Pending Litigation [Member]
2008 Class Action Lawsuits [Member]
cases
Oct. 22, 2012
Pending Litigation [Member]
In re 2008 Fannie Mae ERISA Litigation [Member]
defendants
Mar. 02, 2012
Pending Litigation [Member]
In re 2008 Fannie Mae ERISA Litigation [Member]
defendants
Aug. 30, 2012
Pending Litigation [Member]
Comprehensive Investment Services v. Mudd, et al. [Member]
defendants
Dec. 31, 2012
Pending Litigation [Member]
Transfer Tax Litigation [Member]
counties
Dec. 31, 2010
Unasserted Claim [Member]
Minimum [Member]
Pending Litigation [Member]
In re Fannie Mae Securities Litigation [Member]
Sep. 30, 2010
Unasserted Claim [Member]
Minimum [Member]
Pending Litigation [Member]
In re Fannie Mae Securities Litigation [Member]
Dec. 31, 2010
Unasserted Claim [Member]
Maximum [Member]
Pending Litigation [Member]
In re Fannie Mae Securities Litigation [Member]
Sep. 30, 2010
Unasserted Claim [Member]
Maximum [Member]
Pending Litigation [Member]
In re Fannie Mae Securities Litigation [Member]
Dec. 31, 2012
Series T Preferred Stock [Member]
May 31, 2008
Series T Preferred Stock [Member]
Pending Litigation [Member]
Comprehensive Investment Services v. Mudd, et al. [Member]
May 19, 2008
Series T Preferred Stock [Member]
Pending Litigation [Member]
Comprehensive Investment Services v. Mudd, et al. [Member]
Dec. 31, 2012
Series S Preferred Stock [Member]
Dec. 31, 2007
Series S Preferred Stock [Member]
Pending Litigation [Member]
Smith v. Fannie Mae, et al. [Member]
Dec. 11, 2007
Series S Preferred Stock [Member]
Pending Litigation [Member]
Smith v. Fannie Mae, et al. [Member]
Dec. 31, 2012
Series S Preferred Stock [Member]
Minimum [Member]
Mar. 31, 2012
MICHIGAN
Pending Litigation [Member]
Transfer Tax Litigation [Member]
cases
Loss Contingencies [Line Items]                                        
Damages claimed to plaintiffs under various scenarios                 $ 2,200,000,000 $ 2,200,000,000 $ 8,600,000,000 $ 8,600,000,000                
Number of lawsuits that Fannie Mae is a defendant       2                                
Number of current Board members added as defendants           2                            
Number of former and current directors and officers dismissed from the action         7   2                          
Preferred stock offering amount                             2,000,000,000     7,000,000,000    
Preferred stock, annual dividend rate                         8.25% [1] 8.25%   7.75% [2] 7.75%   7.75%  
Number of counties in Illinois as defendants               4                        
Number of cases that we are not exempt from Michigan transfer taxes under our charter                                       2
Rent expenses for operating leases $ 41,000,000 $ 40,000,000 $ 35,000,000                                  
[1] On May 19, 2008, we issued 80 million shares of preferred stock in the amount of $2.0 billion. Subsequent to the initial issuance, we issued an additional 8 million shares in the amount of $200 million on May 22, 2008 and one million shares in the amount of $25 million on June 4, 2008 under the same terms as the initial issuance.
[2] Rate effective December 31, 2012. Variable dividend rate resets quarterly thereafter at a per annum rate equal to the greater of 7.75% or 3-Month LIBOR plus 4.23%. As of December 31, 2012, the annual dividend rate was 7.75%.