Derivative And Credit-Related Financial Instruments (Schedule Of Financial Instruments With Off-Balance Sheet Credit Risk) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Unused Commitments to Extend Credit
Loss contingency, range of possible loss, maximum	$ 30,056	$ 29,617
Commercial And Other | Unused Commitments to Extend Credit
Loss contingency, range of possible loss, maximum	27,905	27,728
Bankcard, Revolving Check Credit And Home Equity Loan Commitments | Unused Commitments to Extend Credit
Loss contingency, range of possible loss, maximum	2,151	1,889
Standby Letters Of Credit
Loss contingency, range of possible loss, maximum	3,880	4,297
Commercial Letters Of Credit
Loss contingency, range of possible loss, maximum	75	103
Other Credit-Related Financial Instruments
Loss contingency, estimate of possible loss	$ 1	$ 2