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Business Overview - Additional Information (Detail) - $ / shares	Jul. 01, 2025	Oct. 01, 2024	Dec. 31, 2025	Dec. 31, 2024
Business Combination [Line Items]
Common stock, par value			$ 0.01	$ 0.01
Global Infrastructure Management, LLC [Member]
Business Combination [Line Items]
Description of acquisition		On October 1, 2024, BlackRock completed the acquisition of 100% of the issued and outstanding limited liability company interests of GIP (the "GIP Transaction")
Business acquisition, percentage of equity interest acquired		100.00%
HPS Investment Partners [Member]
Business Combination [Line Items]
Description of acquisition	On July 1, 2025, BlackRock completed the acquisition of 100% of the business and assets of HPS Investment Partners (the "HPS Transaction" or "HPS"), a leading global credit investment manager, with substantially all consideration paid in Class B-2 common units ("Subco Units") of BlackRock Saturn Subco, LLC ("Subco"), a consolidated subsidiary of the Company.
Business acquisition, percentage of equity interest acquired	100.00%

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