Derivative And Credit-Related Financial Instruments (Schedule Of Financial Instruments With Off-Balance Sheet Credit Risk) (Details) - Maximum - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Unused Commitments to Extend Credit
Credit Related Financial Instrument [Line Items]
Loss contingency, estimate of possible loss	$ 33,766	$ 34,817
Commercial and other | Unused Commitments to Extend Credit
Credit Related Financial Instrument [Line Items]
Loss contingency, estimate of possible loss	29,621	30,800
Bankcard, revolving credit and home equity loan commitments | Unused Commitments to Extend Credit
Credit Related Financial Instrument [Line Items]
Loss contingency, estimate of possible loss	4,145	4,017
Standby letters of credit
Credit Related Financial Instrument [Line Items]
Loss contingency, estimate of possible loss	3,586	3,712
Commercial letters of credit
Credit Related Financial Instrument [Line Items]
Loss contingency, estimate of possible loss	$ 42	$ 39