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Loans and Leases (Narrative) (Details) (USD $)
Jun. 30, 2011
Dec. 31, 2010
Loans and Leases    
Outstanding unpaid principal balance for all purchased impaired loans $ 3,200,000,000 $ 3,800,000,000
Outstanding unpaid principal balance for all purchased nonimpaired loans 4,300,000,000 5,000,000,000
Total commitments to lend additional funds to clients with loans whose terms have been modified in restructurings $ 28,000,000 $ 64,000,000