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Allowance for Loan Losses Allowance at Recorded Investment (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses for individually impaired loans $ 34,873 [1]   $ 37,729 [1]      
Allowance for loan losses for collectively reserved loans 4,194   6,117      
Allowance for loan losses 39,067 41,911 43,846 49,643 56,461 58,795
Recorded investment in individually impaired loans 191,746 [1],[2]   193,279 [1],[2]      
Recorded investment in collectively reserved loans 2,845,553 [2]   2,871,390 [2]      
Total recorded investment in loans 3,037,299 [2]   3,064,669 [2]      
Single-Family [Member]
           
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses for individually impaired loans 34,624 [1]   37,423 [1]      
Allowance for loan losses for collectively reserved loans 4,019   5,884      
Allowance for loan losses 38,643 41,448 43,307 48,770 55,501 57,687
Recorded investment in individually impaired loans 188,395 [1],[2]   189,064 [1],[2]      
Recorded investment in collectively reserved loans 2,665,958 [2]   2,689,627 [2]      
Total recorded investment in loans 2,854,353 [2]   2,878,691 [2]      
Multifamily [Member]
           
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses for individually impaired loans 249 [1]   306 [1]      
Allowance for loan losses for collectively reserved loans 175   233      
Allowance for loan losses 424 463 539 873 960 1,108
Recorded investment in individually impaired loans 3,351 [1],[2]   4,215 [1],[2]      
Recorded investment in collectively reserved loans 179,595 [2]   181,763 [2]      
Total recorded investment in loans $ 182,946 [2]   $ 185,978 [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.