Derivative And Credit-Related Financial Instruments (Schedule Of Financial Instruments With Off-Balance Sheet Credit Risk) (Details) - Maximum - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Unused Commitments to Extend Credit
Loss contingency, estimate of possible loss, maximum	$ 31,385	$ 34,817
Commercial And Other | Unused Commitments to Extend Credit
Loss contingency, estimate of possible loss, maximum	27,303	30,800
Bankcard, Revolving Check Credit And Home Equity Loan Commitments | Unused Commitments to Extend Credit
Loss contingency, estimate of possible loss, maximum	4,082	4,017
Standby Letters Of Credit
Loss contingency, estimate of possible loss, maximum	3,586	3,712
Commercial Letters Of Credit
Loss contingency, estimate of possible loss, maximum	$ 48	$ 39