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Variable Interest Entities Reflects adoption of ASU 2015-12 - Additional Information (Detail) - USD ($) $ in Billions	Mar. 31, 2025	Dec. 31, 2024
Variable Interest Entity, Not Primary Beneficiary [Member] \| Sponsored Investment Products [Member]
Variable Interest Entity [Line Items]
Net assets of investments funds	$ 52	$ 46

- 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.

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