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Loans And Leases (Narrative) (Details) (USD $)	3 Months Ended	12 Months Ended
Loans And Leases (Narrative) (Details) (USD $)	Mar. 31, 2012 days	Dec. 31, 2011 days
Aggregate short-duration advances	4,500,000,000	2,170,000,000
Aggregate of debt restructurings	199,000,000
Commercial Real Estate [Member]
Loans or leases contractually past-due days	90	90
Institutional [Member]
Loans and Leases 90 Days or More Contractually Past Due	0	0
Loans or leases contractually past-due days	90	90

Carrying value as of the balance sheet date of payments made in excess of existing cash balances, which will be honored by the bank but reflected as a loan to the entity. Overdrafts generally have a very short time frame for correction or repayment and are therefore more similar to short-term bank financing than trade financing.

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