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Mortgage Loans Credit Quality Indicators - MF (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans $ 3,040,632 [1] $ 3,064,669 [1]
Multifamily [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 186,084 [1],[2],[3] 185,978 [1],[2],[3]
Multifamily [Member] | Pass [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 177,962 [1],[2] 176,528 [1],[2]
Multifamily [Member] | Special Mention [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 2,633 [1],[2] 2,234 [1],[2]
Multifamily [Member] | Substandard [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 5,174 [1],[2] 6,758 [1],[2]
Multifamily [Member] | Doubtful [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans $ 315 [1],[2] $ 458 [1],[2]
[1] Recorded investment consists of unpaid principal balance, unamortized premiums, discounts and other cost basis adjustments, and accrued interest receivable.
[2] 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 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).
[3] Multifamily loans 60-89 days delinquent are included in the seriously delinquent column.