Fair Value (Schedule Of Carrying Values And Estimated Fair Values Of Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Held-to-maturity, fair value	$ 609,547	$ 674,741
Loans and Leases Receivable, Net Amount	38,297,074	36,769,160
Time deposits	2,593,038	2,962,931
Other short-term borrowings	0	5,409
Long-term debt (less fair value hedges)	2,273,575	2,337,113
Fair Value, Inputs, Level 2 [Member] | Carrying Value [Member]
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Time deposits	2,593,038	2,962,931
Foreign deposits	1,980,161	1,804,060
Other short-term borrowings	0	5,409
Long-term debt (less fair value hedges)	2,269,762	2,329,323
Fair Value, Inputs, Level 2 [Member] | Estimated Fair Value [Member]
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Time deposits	2,602,955	2,988,714
Foreign deposits	1,979,805	1,803,625
Other short-term borrowings	0	5,421
Long-term debt (less fair value hedges)	2,423,643	2,636,422
Fair Value, Inputs, Level 3 [Member] | Carrying Value [Member]
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Held-to-maturity, fair value	588,981	756,909
Loans and Leases Receivable, Net Amount	38,468,402	37,020,811
Fair Value, Inputs, Level 3 [Member] | Estimated Fair Value [Member]
Fair Value, Estimate Not Practicable, Financial Statement Captions [Line Items]
Held-to-maturity, fair value	609,547	674,741
Loans and Leases Receivable, Net Amount	$ 38,088,242	$ 37,024,198