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Loans and Leases (Narrative) (Details) (USD $)	Mar. 31, 2012	Dec. 31, 2011
Loans and Leases
Outstanding unpaid principal balance for all purchased impaired loans	$ 3,000,000,000	$ 3,300,000,000
Outstanding unpaid principal balance for all purchased nonimpaired loans	3,600,000,000	3,900,000,000
Total commitments to lend additional funds to clients with loans whose terms have been modified in restructurings	$ 37,000,000	$ 32,000,000

The undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loan, owed to the investor at the reporting date, whether or not currently due and whether or not any such amounts have been written or charged off by the investor. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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