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, 2024	Mar. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Compensation and benefits expense	$ (1,925)	$ (1,726)
Other net benefit credits	(67)	(58)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Compensation and benefits expense	6	6
Other net benefit credits	(67)	(58)
Net benefit credit	$ (61)	$ (52)