Variable Interest Entities Reflects adoption of ASU 2015-12 - Balances Relating to Variable Interest Entities in which BlackRock is Not Primary Beneficiary (Detail) - Variable Interest Entity, Not Primary Beneficiary [Member] - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Investments Member
Variable Interest Entity [Line Items]
Sponsored investment products	$ 2,377	$ 1,060
Advisory Fee Receivables [Member]
Variable Interest Entity [Line Items]
Sponsored investment products	116	95
Other Net Assets (Liabilities) [Member]
Variable Interest Entity [Line Items]
Sponsored investment products	(11)	(12)
Maximum Risk of Loss [Member]
Variable Interest Entity [Line Items]
Sponsored investment products	$ 2,510	$ 1,172

- 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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