Income Taxes (Schedule Of Reconciliation Of The U.S. Statutory Income Tax Rate To The Effective Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Income Taxes [Abstract]
U.S. federal income tax rate	35.00%		35.00%		35.00%
State taxes, net of federal benefit	2.00%		1.20%		1.70%
Tax-exempt income	(2.90%)		(3.60%)		(3.10%)
Tax credits	(1.50%)		(1.30%)		(1.60%)
Foreign tax differential	(4.30%)		(3.60%)		(5.00%)
Transactions related to investment securities	(4.10%)	[1]	(2.30%)	[1]
Non-deductible penalty					1.00%
Other, net	0.10%				0.60%
Effective tax rate	24.30%		25.40%		28.60%

[1] Amounts for both years represented the effect of discrete tax benefits related to the cost to terminate funding obligations that supported former conduit asset structures; the amount for 2010 also included the partial write-off of a deferred tax asset associated with certain of the investment securities sold in connection with our December 2010 investment portfolio repositioning.