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Acquisitions - Summary of Business Acquisition, Pro Forma Information Combined Results of Operations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Business Acquisition [Line Items]      
Total revenue $ 24,216 $ 20,407 $ 17,859
GIP And HPS [Member]      
Business Acquisition [Line Items]      
Total revenue 24,984 [1] 22,479  
Net income attributable to BlackRock, Inc. $ 5,645 [1] $ 5,469  
[1] Subsequent to the closing of the HPS Transaction on July 1, 2025, HPS contributed approximately $900 million of revenue and $230 million of net income.