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Acquisitions - Additional Information (Detail) $ / shares in Units, $ in Millions, £ in Billions |  |  |  |  | 12 Months Ended |  |
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Sep. 02, 2025 | Jul. 01, 2025 USD ($) $ / shares shares | Mar. 03, 2025 USD ($) | Mar. 03, 2025 GBP (£) | Oct. 01, 2024 USD ($) shares | Dec. 31, 2025 USD ($) $ / shares shares | Dec. 31, 2024 USD ($) shares | Dec. 31, 2023 USD ($) | Sep. 30, 2024 $ / shares | Mar. 31, 2024 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Issuance of common share in connection with acquisition |  |  |  |  |  |  | $ 5,904 |  |  |
Contingent consideration liabilities |  |  |  |  |  | $ 8,429 | $ 4,302 |  |  |
Common stock, shares issued | shares |  |  |  |  |  | 156,276,289 | 155,318,170 |  |  |
Deferred cash compensation expense |  |  |  |  |  | $ 371 | $ 212 | $ 226 |  |
Debt instrument, aggregate principal amount |  |  |  |  |  | $ 12,875 |  |  |  |
Cliff vesting RSU [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
RSUs to employees that cliff vest, percentage |  | 100.00% |  |  |  |  |  |  |  |
Performance-Based RSUs [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Stock price | $ / shares |  |  |  |  |  | $ 1,070 |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Stock price | $ / shares |  |  |  |  |  | $ 1,070 |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Issuance of common share in connection with acquisition |  |  |  |  |  | $ 244,240 | 6,908,416 |  |  |
Subco Units [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Issuance of common share in connection with acquisition |  |  |  |  |  | 8,448,427 | 0 |  |  |
Number of shares issued | shares |  | 8,500,000 |  |  |  |  |  |  |  |
Subco Units [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent payments | shares |  | 2,800,000 |  |  |  |  |  |  |  |
Subco Units [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent payments | shares |  | 4,400,000 |  |  |  |  |  |  |  |
March 2024 Notes [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, aggregate principal amount |  |  |  |  |  | $ 3,000 |  |  |  |
Global Infrastructure Management, LLC [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Cash paid |  |  |  |  | $ 2,913 |  |  |  |  |
Business acquisition, percentage of equity interest acquired |  |  |  |  | 100.00% |  |  |  |  |
Contingent consideration liabilities |  |  |  |  | $ 4,200 |  |  |  |  |
Goodwill, expected tax deductible amount |  |  |  |  | $ 180 |  |  |  |  |
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") |  |  |  |  |
Debt instrument, aggregate principal amount |  |  |  |  |  |  |  |  |  | $ 3,000
Global Infrastructure Management, LLC [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Issuance of common share in connection with acquisition |  |  |  |  | $ 5,900 |  |  |  |  |
Number of shares issued | shares |  |  |  |  | 6,900,000 |  |  |  |  |
Stock price | $ / shares |  |  |  |  |  |  |  |  | $ 950 |
Shares issued, price per share | $ / shares |  |  |  |  |  |  |  |  | $ 855 |
Global Infrastructure Management, LLC [Member] | First contingent payment [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent payments | shares |  |  |  |  | 4,000,000 | 4,000,000 |  |  |  |
Global Infrastructure Management, LLC [Member] | First contingent payment [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent payments | shares |  |  |  |  | 5,200,000 | 5,200,000 |  |  |  |
Global Infrastructure Management, LLC [Member] | March 2024 Notes [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Cash paid |  |  |  |  | $ 3,000 |  |  |  |  |
HPS Investment Partners [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Date of acquisition |  | Jul. 01, 2025 |  |  |  |  |  |  |  |
Business acquisition, percentage of equity interest acquired |  | 100.00% |  |  |  |  |  |  |  |
Asset under management |  | $ 165,000 |  |  |  |  |  |  |  |
Fee-paying AUM |  | 118,000 |  |  |  |  |  |  |  |
Contingent consideration liabilities |  | $ 3,400 |  |  |  |  |  |  |  |
Restricted Stock Units, Granted | shares |  | 680,000 |  |  |  |  |  |  |  |
Transaction and integration costs |  |  |  |  |  | $ 525 |  |  |  |
Deferred cash compensation expense |  |  |  |  |  | 465 |  |  |  |
Acquisitions related costs |  |  |  |  |  | 60 |  |  |  |
Amortization of intangible assets |  |  |  |  |  | 234 |  |  |  |
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. |  |  |  |  |  |  |  |
HPS Investment Partners [Member] | Acquisition - related costs [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Acquisitions related costs |  |  |  |  |  | 60 |  |  |  |
HPS Investment Partners [Member] | Compensation Related Expense Pro Forma Adujustment Value [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Deferred cash compensation expense |  |  |  |  |  | 285 | 575 |  |  |
HPS Investment Partners [Member] | Amortization Of Finite Lived Intangible Assets Pro Forma Adjustment Value [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  |  | $ 250 | $ 500 |  |  |
HPS Investment Partners [Member] | Cliff vesting RSU [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Restricted Stock Units, Granted | shares |  | 270,000 |  |  |  |  |  |  |  |
Granted incentive retention awards |  | $ 260 |  |  |  |  |  |  |  |
HPS Investment Partners [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Award vesting period |  | 5 years |  |  |  |  |  |  |  |
Granted incentive retention awards |  | $ 675 |  |  |  |  |  |  |  |
HPS Investment Partners [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Finite lived intangible assets estimated useful lives |  |  |  |  |  | 3 years |  |  |  |
HPS Investment Partners [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares issued | shares |  | 13,800,000 |  |  |  |  |  |  |  |
Finite lived intangible assets estimated useful lives |  |  |  |  |  | 12 years |  |  |  |
HPS Investment Partners [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Stock price | $ / shares |  | $ 1,049 |  |  |  |  |  |  |  |
HPS Investment Partners [Member] | Subco Units [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Issuance of common share in connection with acquisition |  | $ 8,500 |  |  |  |  |  |  |  |
Number of shares issued | shares |  | 8,500,000 |  |  |  |  |  |  |  |
HPS Investment Partners [Member] | Subco Units [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent payments | shares |  | 2,800,000 |  |  |  | 2,800,000 |  |  |  |
HPS Investment Partners [Member] | Subco Units [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent payments | shares |  | 4,400,000 |  |  |  | 4,400,000 |  |  |  |
Preqin Holding Limited [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Cash paid |  |  | $ 3,219 | £ 2.5 |  |  |  |  |  |
Business acquisition, percentage of equity interest acquired |  |  | 100.00% | 100.00% |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  |  | $ 95 |  |  |  |
Description of acquisition |  |  | On March 3, 2025, BlackRock completed the acquisition of 100% of the shares of Preqin Holding Limited (the "Preqin Transaction" or "Preqin"), a leading provider of private markets data, for £2.5 billion (or approximately $3.2 billion) in cash. | On March 3, 2025, BlackRock completed the acquisition of 100% of the shares of Preqin Holding Limited (the "Preqin Transaction" or "Preqin"), a leading provider of private markets data, for £2.5 billion (or approximately $3.2 billion) in cash. |  |  |  |  |  |
Acquired finite-lived intangible assets weighted-average useful life |  |  |  |  |  | 8 years |  |  |  |
Preqin Holding Limited [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Finite lived intangible assets estimated useful lives |  |  |  |  |  | 5 years |  |  |  |
Preqin Holding Limited [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Finite lived intangible assets estimated useful lives |  |  |  |  |  | 10 years |  |  |  |
ElmTree Funds [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Date of acquisition | Sep. 02, 2025 |  |  |  |  |  |  |  |  |
Business acquisition, percentage of equity interest acquired | 100.00% |  |  |  |  |  |  |  |  |
Description of acquisition | On September 2, 2025, BlackRock completed the acquisition of 100% of the equity interests in ElmTree Funds (the "ElmTree Transaction" or "ElmTree"), a net-lease real estate investment firm, with consideration paid primarily in BlackRock common stock. The acquisition of ElmTree positions the Company to scale its real estate-related offerings, while expanding into new markets as an owner-operator. See Note 11, Goodwill and Note 12, Intangible Assets for additional information on the goodwill and intangible assets related to ElmTree. |  |  |  |  |  |  |  |  |

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