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Commitments and Contingencies (Details) (Pending Litigation [Member], USD $)
In Billions, unless otherwise specified
12 Months Ended 9 Months Ended 0 Months Ended 1 Months Ended
Dec. 31, 2008
2008 Class Action Lawsuits and Related Proceedings [Member]
cases
Feb. 25, 2010
Individual Securities Actions [Member]
cases
Oct. 22, 2012
In re 2008 Fannie Mae ERISA Litigation [Member]
defendants
Mar. 02, 2012
In re 2008 Fannie Mae ERISA Litigation [Member]
defendants
Aug. 30, 2012
Comprehensive Investment Services v. Mudd, et al. [Member]
defendants
Jul. 30, 2008
Housing Trust Fund [Member]
Dec. 31, 2010
Unasserted Claim [Member]
Minimum [Member]
In re Fannie Mae Securities Litigation [Member]
Dec. 31, 2010
Unasserted Claim [Member]
Maximum [Member]
In re Fannie Mae Securities Litigation [Member]
May 31, 2008
Series T Preferred Stock [Member]
Comprehensive Investment Services v. Mudd, et al. [Member]
Dec. 31, 2007
Series S Preferred Stock [Member]
Smith v. Fannie Mae, et al. [Member]
Loss Contingencies [Line Items]                    
Damages claimed to plaintiffs under various scenarios             $ 2.2 $ 8.6    
Number of lawsuits that Fannie Mae is a defendant 2 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                 $ 2.0 $ 7.0
Preferred stock, annual dividend rate                 8.25% 7.75%
Basis points of each dollar of unpaid principal balance           0.042%        
Percentage of the funds set aside as required by the Federal Housing Finance Regulatory Reform Act of 2008 that should be allocated to the Housing Trust Fund           65.00%        
Percentage of the funds set aside as required by the Federal Housing Finance Regulatory Reform Act of 2008 that should be allocated to the Capital Magnet Fund           35.00%