v3.25.2
Document and Entity Information - shares
 6 Months Ended
Jun. 30, 2025
Jul. 31, 2025
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2025  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
Entity Registrant Name BlackRock, Inc.  
Entity Central Index Key 0002012383  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Entity Shell Company false  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Current Reporting Status Yes  
Entity File Number 001-42297  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 99-1116001  
Entity Address, Address Line One 50 Hudson Yards  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10001  
City Area Code 212  
Local Phone Number 810-5800  
Document Quarterly Report true  
Document Transition Report false  
Entity Interactive Data Current Yes  
Common Stock [Member]    
Document Information [Line Items]    
Trading Symbol BLK  
Entity Common Stock, Shares Outstanding   154,853,337
Title of 12(b) Security Common Stock, $.01 par value  
Security Exchange Name NYSE  
Fully Diluted Shares [Member]    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   163,185,815
Exchangeable Units [Member]    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   8,332,478
3.750% Notes due 2035 [Member]    
Document Information [Line Items]    
Trading Symbol BLK 35  
Title of 12(b) Security 3.750% Notes due 2035  
Security Exchange Name NYSE