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
	Mar. 31, 2023	Mar. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Compensation and benefits expense	$ (1,726)	$ (1,445)
Other net benefit credit	(58)	(62)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Compensation and benefits expense	6	8
Other net benefit credit	(58)	(63)
Net benefit credit	$ (52)	$ (55)