Derivative And Credit-Related Financial Instruments (Schedule Of Financial Instruments With Off-Balance Sheet Credit Risk) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Unused Commitments to Extend Credit [Member]
Loss contingency, range of possible loss, maximum	$ 29,617,000,000	$ 27,340,000,000
Commercial And Other [Member] | Unused Commitments to Extend Credit [Member]
Loss contingency, range of possible loss, maximum	27,728,000,000	25,659,000,000
Bankcard, Revolving Check Credit And Home Equity Loan Commitments [Member] | Unused Commitments to Extend Credit [Member]
Loss contingency, range of possible loss, maximum	1,889,000,000	1,681,000,000
Standby Letters Of Credit [Member]
Loss contingency, range of possible loss, maximum	4,297,000,000	4,985,000,000
Commercial Letters Of Credit [Member]
Loss contingency, range of possible loss, maximum	103,000,000	78,000,000
Other Credit-Related Financial Instruments [Member]
Loss contingency, estimate of possible loss	$ 2,000,000	$ 1,000,000