Loans and Leases (Narrative) (Details) (USD $) In Billions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Loans and Leases
Outstanding unpaid principal balance for all purchased impaired loans	$ 2.3	$ 3.3
Outstanding unpaid principal balance for all purchased nonimpaired loans	$ 2.9	$ 3.9

- Definition

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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