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Segment Reporting (Assets) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets $ 3,270,108 $ 3,222,422
Single-Family [Member]
   
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 41,206 17,595
Multifamily [Member]
   
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 10,848 5,182
Capital Markets [Member]
   
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 596,436 723,217
Consolidated Trusts [Member]
   
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 2,812,459 2,749,571
Eliminations/Adjustments [Member]
   
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets $ (190,841) [1] $ (273,143) [1]
[1] Includes the elimination of Fannie Mae MBS in the Capital Markets group’s retained mortgage portfolio that are issued by consolidated trusts. Also includes the elimination of the allowance for loan losses, allowance for accrued interest receivable and fair value losses previously recognized on acquired credit impaired loans as they are not treated as assets for Single-Family and Multifamily segment reporting purposes because these allowances and losses relate to loan assets that are held by the Capital Markets segment and consolidated trusts.