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Expenses - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
Expenses - Narrative (Details) - USD ($)	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
BBH Investor Services
Restructuring Cost and Reserve [Line Items]
Acquisition costs	$ 0	$ 13,000,000	$ 0	$ 34,000,000

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details