v3.22.1
Document and Entity Information - shares
 3 Months Ended
Mar. 31, 2022
Apr. 30, 2022
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2022  
Document Fiscal Year Focus 2022  
Document Fiscal Period Focus Q1  
Entity Registrant Name BlackRock, Inc.  
Entity Central Index Key 0001364742  
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 Common Stock, Shares Outstanding   151,503,255
Entity Current Reporting Status Yes  
Entity File Number 001-33099  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 32-0174431  
Entity Address, Address Line One 55 East 52nd Street  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10055  
City Area Code 212  
Local Phone Number 810-5300  
Document Quarterly Report true  
Document Transition Report false  
Entity Interactive Data Current Yes  
Common Stock, $.01 Par Value [Member]    
Document Information [Line Items]    
Trading Symbol BLK  
Title of 12(b) Security Common Stock, $.01 par value  
Security Exchange Name NYSE  
1.250% Notes due 2025 [Member]    
Document Information [Line Items]    
Trading Symbol BLK25  
Title of 12(b) Security 1.250% Notes due 2025  
Security Exchange Name NYSE