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Allowance for Loan Losses Allowance at Recorded Investment (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses for individually impaired loans $ 37,946 [1]   $ 45,034 [1]      
Allowance for loan losses for collectively reserved loans 7,223   13,761      
Allowance for loan losses 45,169 49,643 58,795 63,012 63,375 72,156
Recorded investment in individually impaired loans 194,420 [1],[2]   200,391 [1],[2]      
Recorded investment in collectively reserved loans 2,858,736 [2]   2,807,080 [2]      
Total recorded investment 3,053,156 [2]   3,007,471 [2]      
Multifamily [Member]
           
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses for individually impaired loans 398 [1]   489 [1]      
Allowance for loan losses for collectively reserved loans 295   619      
Allowance for loan losses 693 873 1,108 1,115 1,241 1,523
Recorded investment in individually impaired loans 4,564 [1],[2]   4,539 [1],[2]      
Recorded investment in collectively reserved loans 183,524 [2]   186,512 [2]      
Total recorded investment 188,088 [2],[3],[4]   191,051 [2],[3],[5]      
Single-Family [Member]
           
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses for individually impaired loans 37,548 [1]   44,545 [1]      
Allowance for loan losses for collectively reserved loans 6,928   13,142      
Allowance for loan losses 44,476 48,770 57,687 61,897 62,134 70,633
Recorded investment in individually impaired loans 189,856 [1],[2]   195,852 [1],[2]      
Recorded investment in collectively reserved loans 2,675,212 [2]   2,620,568 [2]      
Total recorded investment $ 2,865,068 [2]   $ 2,816,420 [2]      
[1] Includes acquired credit-impaired loans.
[2] Recorded investment consists of unpaid principal balance, unamortized premiums, discounts and other cost basis adjustments, and accrued interest receivable.
[3] Multifamily loans 60-89 days delinquent are included in the seriously delinquent column.
[4] 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).
[5] 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).