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Non-Covered Loans And Leases (Narrative) (Details) (USD $) In Billions, unless otherwise specified	Dec. 31, 2012
Non-Covered Loans And Leases [Abstract]
Total loans pledged to secure borrowings	$ 5.4

Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

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