Line of Business Information - Components of Other (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Total fee revenue	$ 9,606	$ 10,012	$ 9,499
Restructuring charges	(78)
Net acquisition and restructuring costs	(65)	(65)	(50)
Deferred incentive compensation expense acceleration	(147)
Income before income tax expense	3,327	3,171	2,899
Other
Segment Reporting Information [Line Items]
Total fee revenue	23	0	0
Other Income	0	111	0
Restructuring charges	(70)	3	(133)
Net acquisition and restructuring costs	(65)	(65)	(50)
Legal and related expenses	0	(18)	9
Deferred incentive compensation expense acceleration	0	(147)	0
Other expenses	(10)	(35)	0
Income before income tax expense	$ (122)	$ (151)	$ (174)