Derivative And Credit-Related Financial Instruments (Schedule Of Net Gains Recognized In Income On Customer-Initiated Derivatives) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gain recognized in income	$ 35	$ 20	$ 86	$ 72
Customer-initiated and other activities
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gain recognized in income	35	20	86	72
Interest rate contracts | Customer-initiated and other activities
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gain recognized in income	9	2	28	26
Energy contracts | Customer-initiated and other activities
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gain recognized in income	14	7	22	13
Foreign exchange contracts | Customer-initiated and other activities
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gain recognized in income	$ 12	$ 11	$ 36	$ 33