Retirement Benefits (Amounts Recorded in the Consolidated Statements of Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Compensation and benefits expense	$ (5,817)	$ (5,282)	$ (4,280)
Other net benefit (credit) cost	(268)	(239)	(235)
Pension  Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Compensation and benefits expense	23	23	28
Other net benefit (credit) cost	(263)	(237)	(237)
Net benefit (credit) cost	(240)	(214)	(209)
Post-retirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Compensation and benefits expense	0	0	0
Other net benefit (credit) cost	(5)	(2)	2
Net benefit (credit) cost	$ (5)	$ (2)	$ 2