Income Taxes (Schedule Of Reconciliation Of The U.S. Statutory Income Tax Rate To The Effective Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Income Tax Expense (Benefit) [Abstract]
U.S. federal income tax rate	35.00%		35.00%		35.00%
State taxes, net of federal benefit	1.80%		2.00%		1.20%
Tax-exempt income	(2.60%)		(2.90%)		(3.60%)
Tax credits	(2.80%)		(1.50%)		(1.30%)
Foreign tax differential	(5.50%)		(4.30%)		(3.60%)
Transactions related to investment securities	0.00%	[1]	(4.10%)	[1]	(2.30%)	[1]
Other, net	(0.40%)		0.10%		0.00%
Effective tax rate	25.50%		24.30%		25.40%

[1] ) Amounts for 2011 and 2010 represented the effect of discrete tax benefits attributable to costs incurred in terminating former conduit asset structures; amount for 2010 also included the partial write-off of a deferred tax asset associated with certain investment securities sold in connection with our December 2010 investment portfolio repositioning.