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Borrowed Funds (Details Textual) (USD $)
3 Months Ended9 Months Ended
Mar. 31, 2011
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Borrowed Funds (Textual) [Abstract]    
Borrowed funds subject to put back at discretion of lender $ 12,330,000,000 $ 29,080,000,000
Fixed interest rate borrowed funds 7,900,000,000  
Proceeds from sales of mortgage-backed securities available for sale 9,064,379,0001,992,002,000 
Proceeds from sales of investment securities available for sale 82,475,000  
Fixed-rate, fixed-maturity borrowings used to fund extinguishment of debt5,000,000,000   
Weighted-average rate of fixed-rate, fixed-maturity borrowings 0.66%  
Monthly maturities of fixed-rate, fixed-maturity borrowings 250,000,000  
Pre-tax charge resulting from extinguishment of debt1,170,000,000   
Putable borrowings modified to fixed-maturity borrowings 4,000,000,000  
Structured borrowings [Member]
    
Borrowed Funds (Textual) [Abstract]    
Extinguishment of structured borrowings12,500,000,000   
Weighted Average Weight of Extinguished Structured Borrowings3.56%   
Proceeds from sales of mortgage-backed securities available for sale8,580,000,000   
Proceeds from sales of investment securities available for sale$ 80,000,000