Retirement Benefits (Amounts Recorded in the Consolidated Statements of Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Compensation and benefits expense	$ (4,280)	$ (4,312)	$ (3,066)
Other net benefit (credit) cost	(235)	(277)	(257)
Pension  Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Compensation and benefits expense	28	38	36
Other net benefit (credit) cost	(237)	(278)	(258)
Net benefit (credit) cost	(209)	(240)	(222)
Post-retirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Compensation and benefits expense	0	1	0
Other net benefit (credit) cost	2	1	1
Net benefit (credit) cost	$ 2	$ 2	$ 1