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Loans and Commitments to Extend Credit (Narrative) (Details) (USD $)
In Billions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Total syndications, assignments and participations $ 21.4 $ 20.2
Federal Reserve Bank [Member]
   
Loans pledged as collateral for contingent borrowings 23.9 21.8
Federal Home Loan Bank [Member]
   
Loans pledged as collateral for contingent borrowings $ 38.4 $ 27.7