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		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Compensation and benefits expense (Operating income)	$ (885)	$ (680)	$ (1,955)	$ (1,618)
Other net benefit (credits) cost	(63)	(70)	(127)	(134)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Compensation and benefits expense (Operating income)	9	10	17	18
Other net benefit (credits) cost	(63)	(70)	(127)	(134)
Total (credit) cost	(54)	(60)	(110)	(116)
Post-retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Compensation and benefits expense (Operating income)	0	0	0	0
Other net benefit (credits) cost	0	0	0	0
Total (credit) cost	$ 0	$ 0	$ 0	$ 0