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, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Defined Benefit Plan Disclosure [Line Items]
Compensation and benefits expense	$ (1,642)	$ (1,457)	$ (3,567)	$ (3,183)
Other net benefit credits	(66)	(60)	(133)	(118)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Compensation and benefits expense	6	5	12	11
Other net benefit credits	(64)	(60)	(131)	(118)
Net benefit credit	$ (58)	$ (55)	$ (119)	$ (107)