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Mortgage Loans Credit Quality Indicators - MF (Details) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment $ 3,064,669,000,000 [1] $ 3,007,471,000,000 [1]
Multifamily [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 185,978,000,000 [1],[2],[3] 191,051,000,000 [1],[2],[4]
Multifamily [Member] | Pass [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 176,528,000,000 [1],[3]  
Multifamily [Member] | Special Mention [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 2,234,000,000 [1],[3]  
Multifamily [Member] | Substandard [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 6,758,000,000 [1],[3]  
Multifamily [Member] | Doubtful [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 458,000,000 [1],[3]  
Multifamily [Member] | Loans with acceptable risk [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment   154,235,000,000 [1],[4]
Multifamily [Member] | Loans with signs of potential weakness [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment   21,304,000,000 [1],[4],[5]
Unpaid principal balance loans with no available financial information surrounding credit quality   5,100,000,000
Multifamily [Member] | Loans with a Well Defined Weakness that May Jeopardize the Timely Full Repayment [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment   14,199,000,000 [1],[4]
Multifamily [Member] | Loans with a Weakness that Makes Timely Collection or Liquidation in Full More Questionable [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment   $ 1,313,000,000 [1],[4]
[1] Recorded investment consists of unpaid principal balance, unamortized premiums, discounts and other cost basis adjustments, and accrued interest receivable.
[2] Multifamily loans 60-89 days delinquent are included in the seriously delinquent column.
[3] Pass (loan is current and adequately protected by the current financial strength and debt service capacity of the borrower); special mention (loan with signs of potential weakness); substandard (loan with a well defined weakness that jeopardizes the timely full repayment); and doubtful (loan with a weakness that makes collection or liquidation in full highly questionable and improbable based on existing conditions and values).
[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 $5.1 billion of unpaid principal balance as of December 31, 2012 classified as yellow due to no available current financial information.