Expenses - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 78
Net repositioning benefit	78	$ (3)	$ 133
Acquisition and restructuring costs	65	65	50
Charles River Development
Restructuring Cost and Reserve [Line Items]
Acquisitions costs		52
BBH Investor Services
Restructuring Cost and Reserve [Line Items]
Acquisitions costs	65	13
Restructuring charges	8
Compensation and Employee Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	50
Net repositioning benefit	58	(32)	82
Occupancy Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	20
Net repositioning benefit	$ 20	$ 29	$ 51