Segment Information - Additional Information (Detail) |
6 Months Ended |
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Jun. 30, 2025
Segment
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| Segment Reporting [Abstract] | |
| Number of business segments | 1 |
| Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration] | Chairman and Chief Executive Officer [Member] |
| Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description | The Company's chief operating decision maker ("CODM") is its Chairman and Chief Executive Officer, who reviews financial information presented, including significant expenses on a consolidated basis, as presented in the condensed consolidated statements of income. The CODM utilizes a consolidated approach to assess performance and allocates resources using key financial metrics including total revenue, operating income and net income attributable to BlackRock, Inc. These financial metrics are used by the CODM to make key operating decisions, including capital allocation, determining annual and long-term compensation and managing costs in relation to revenue. Furthermore, these financial metrics are used to evaluate financial performance based on consolidated specific business objectives, contributions to the total firm operating margin and to evaluate the Company's relative performance against industry peers. See the condensed consolidated financial statements for key financial metrics used by the CODM and for more financial information regarding the Company’s operating segment. The measure of segment assets is reported on the balance sheet as total consolidated assets. |