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Mortgage Loans Credit Quality Indicators - MF (Details) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment $ 3,008,974,000,000 [1],[2] $ 2,978,891,000,000 [1]
Multifamily [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 186,869,000,000 [1],[2],[3],[4] 179,221,000,000 [1],[3],[4]
Multifamily [Member] | Credit Risk Profile by Internally Assigned Grade: Green [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 146,755,000,000 [1],[4] 131,740,000,000 [1],[4]
Multifamily [Member] | Credit Risk Profile by Internally Assigned Grade: Yellow [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 23,500,000,000 [1],[4],[5] 28,354,000,000 [1],[4],[5]
Unpaid principal balance loans with no available financial information surrounding credit quality 6,700,000,000 6,900,000,000
Multifamily [Member] | Credit Risk Profile by Internally Assigned Grade: Orange [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 15,500,000,000 [1],[4] 17,355,000,000 [1],[4]
Multifamily [Member] | Credit Risk Profile by Internally Assigned Grade: Red [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment $ 1,114,000,000 [1],[4] $ 1,772,000,000 [1],[4]
[1] Recorded investment consists of unpaid principal balance, unamortized premiums, discounts and other cost basis adjustments, and accrued interest receivable.
[2] As of September 30, 2012, we began classifying as TDRs loans to certain borrowers who have received bankruptcy relief. These loans had a recorded investment of $22.9 billion and a related allowance of $1.1 billion as of September 30, 2012.
[3] Multifamily loans 60-89 days delinquent are included in the seriously delinquent column.
[4] Green (loan with acceptable risk); yellow (loan with signs of potential weakness); orange (loan with a well defined weakness that may jeopardize the timely full repayment); and red (loan with a weakness that makes timely collection or liquidation in full more questionable based on existing conditions and values).
[5] Includes approximately $6.7 billion and $6.9 billion of unpaid principal balance as of September 30, 2012 and December 31, 2011, respectively, classified as yellow due to no available financial information.