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Acquisitions - Additional Information (Detail)
$ / shares in Units, $ in Millions, £ in Billions
 12 Months Ended
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.