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Fair Values of Assets and Liabilities (Details 6) (USD $)
In Millions
Sep. 30, 2011
Dec. 31, 2010
Financial Assets  
Cash and due from banks$ 13,708$ 14,487
Investment securities held-to-maturity16,2691,469
Mortgages held for sale5,1528,100
Loans199,818191,751
Financial Liabilities  
Deposits222,632204,252
Short-term borrowings32,02932,557
Long-term debt30,62431,537
Carrying Amount [Member]
  
Financial Assets  
Cash and due from banks13,70814,487
Investment securities held-to-maturity16,2691,469
Mortgages held for sale44
Other loans held for sale219267
Loans199,818191,751
Financial Liabilities  
Deposits222,632204,252
Short-term borrowings32,02932,557
Long-term debt30,62431,537
Fair Value [Member]
  
Financial Assets  
Cash and due from banks13,70814,487
Investment securities held-to-maturity16,6131,419
Mortgages held for sale44
Other loans held for sale220267
Loans202,037192,058
Financial Liabilities  
Deposits223,042204,799
Short-term borrowings32,09432,839
Long-term debt$ 31,467$ 31,981