v3.24.0.1
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, 2023
Dec. 31, 2022
Dec. 31, 2021
Earnings Per Share Basic And Diluted [Line Items]      
Net income attributable to BlackRock, Inc. $ 5,502 $ 5,178 $ 5,901
Basic weighted-average shares outstanding 149,327,558 150,921,161 152,236,047
Total diluted weighted-average shares outstanding 150,706,451 152,440,471 154,404,357
Basic earnings per share $ 36.85 $ 34.31 $ 38.76
Diluted earnings per share $ 36.51 $ 33.97 $ 38.22
Restricted Stock Units (RSUs) [Member]      
Earnings Per Share Basic And Diluted [Line Items]      
Dilutive effect of 969,089 1,119,829 1,507,859
Stock Options [Member]      
Earnings Per Share Basic And Diluted [Line Items]      
Dilutive effect of 409,804 399,481 660,451