Retirement Benefits (Amounts Recorded in the Consolidated Statements of Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Compensation and benefits expense	$ (4,312)	$ (3,066)	$ (2,677)
Other net benefit (credit) cost	(277)	(257)	(265)
Pension  Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Compensation and benefits expense	38	36	31
Other net benefit (credit) cost	(278)	(258)	(265)
Total credit	(240)	(222)	(234)
Post-retirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Compensation and benefits expense	1	0	0
Other net benefit (credit) cost	1	1	0
Total credit	$ 2	$ 1	$ 0