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Loans and Commitments to Extend Credit (Narrative) (Details) (USD $) In Billions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Total syndications, assignments and participations	$ 23.5	$ 22.5
Federal Reserve Bank [Member]
Loans pledged as collateral for contingent borrowings	22.9	23.2
Federal Home Loan Bank [Member]
Loans pledged as collateral for contingent borrowings	$ 45.5	$ 37.3

The sum of the carrying amounts, as of the date of the latest financial statement presented, of loans receivable which are owned but transferred to serve as collateral for the payment of related debt obligations, primarily secured borrowings and repurchase agreements, and for which the transferees are not permitted to sell or re-pledge them to an unrelated party.

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