| Document and Entity Information | Jan. 15, 2025 |
| Cover [Abstract] | |
| Entity Registrant Name | BLACKROCK, INC. |
| Entity Incorporation State Country Code | DE |
| Entity Address, State or Province | NY |
| Amendment Flag | false |
| Entity Central Index Key | 0002012383 |
| Document Type | 8-K |
| Document Period End Date | Jan. 15, 2025 |
| Entity File Number | 001-42297 |
| Entity Tax Identification Number | 99-1116001 |
| Entity Address, Address Line One | 50 Hudson Yards |
| Entity Address, City or Town | New York |
| Entity Address, Postal Zip Code | 10001 |
| City Area Code | 212 |
| Local Phone Number | 810-5800 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Security 12b Title | Common Stock, $.01 par value |
| Trading Symbol | BLK |
| Security Exchange Name | NYSE |
