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Allowance for Loan Losses Allowance at Recorded Investment (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan losses for individually impaired loans $ 36,838 [1] $ 37,729 [1]    
Allowance for loan losses for collectively reserved loans 5,073 6,117    
Allowance for loan losses 41,911 43,846 56,461 58,795
Recorded investment in individually impaired loans 192,893 [1],[2] 193,279 [1],[2]    
Recorded investment in collectively reserved loans 2,860,224 [2] 2,871,390 [2]    
Total recorded investment in loans 3,053,117 [2] 3,064,669 [2]    
Single-Family [Member]
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan losses for individually impaired loans 36,580 [1] 37,423 [1]    
Allowance for loan losses for collectively reserved loans 4,868 5,884    
Allowance for loan losses 41,448 43,307 55,501 57,687
Recorded investment in individually impaired loans 189,281 [1],[2] 189,064 [1],[2]    
Recorded investment in collectively reserved loans 2,680,477 [2] 2,689,627 [2]    
Total recorded investment in loans 2,869,758 [2] 2,878,691 [2]    
Multifamily [Member]
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan losses for individually impaired loans 258 [1] 306 [1]    
Allowance for loan losses for collectively reserved loans 205 233    
Allowance for loan losses 463 539 960 1,108
Recorded investment in individually impaired loans 3,612 [1],[2] 4,215 [1],[2]    
Recorded investment in collectively reserved loans 179,747 [2] 181,763 [2]    
Total recorded investment in loans $ 183,359 [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.