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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Compensation and benefits expense (Operating income)	$ (680)	$ (691)	$ (1,618)	$ (1,599)
Other net benefit (credits) cost	(70)	(65)	(134)	(131)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Compensation and benefits expense (Operating income)	10	7	18	17
Other net benefit (credits) cost	(70)	(65)	(134)	(131)
Total (credit) cost	(60)	(58)	(116)	(114)
Postretirement 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