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Earnings Per Share - Computation of Basic and Diluted EPS under Treasury Stock Method (Detail) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Earnings Per Share Basic And Diluted [Line Items]      
Net Income (Loss) $ 5,553 $ 6,369 $ 5,502
Diluted net income attributable to BlackRock, Inc. $ 5,680 $ 6,369 $ 5,502
Basic weighted-average shares outstanding 154,984,319 150,042,269 149,327,558
Total diluted weighted-average shares outstanding 160,866,521 151,615,085 150,706,451
Basic earnings per share $ 35.83 $ 42.45 $ 36.85
Diluted earnings per share $ 35.31 $ 42.01 $ 36.51
Restricted Stock Units (RSUs) [Member]      
Earnings Per Share Basic And Diluted [Line Items]      
Dilutive effect of 1,383,325 1,034,323 969,089
Employee Stock Option      
Earnings Per Share Basic And Diluted [Line Items]      
Dilutive effect of 460,656 538,493 409,804
Subco [Member]      
Earnings Per Share Basic And Diluted [Line Items]      
Add: Incremental net income from dilutive securities - NCI - Subco $ 127 $ 0 $ 0
Dilutive effect of 4,038,221 0 0