Retirement Benefits (Schedule Of Defined Benefit Plan Net Periodic Benefit Cost Amounts Recorded in Consolidated Statement of Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Compensation and benefits expense (Operating income)	$ (740)	$ (540)	$ (3,326)	$ (2,495)
Other net benefit (credits) cost	(69)	(60)	(211)	(187)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Compensation and benefits expense (Operating income)	9	10	29	27
Other net benefit (credits) cost	(69)	(60)	(212)	(187)
Total credit	$ (60)	$ (50)	$ (183)	$ (160)