v3.22.1
Earnings Per Share - Computation of Basic and Diluted Earnings per Share ("EPS") under Treasury Stock Method (Detail) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Earnings Per Share Basic And Diluted [Line Items]    
Net income attributable to BlackRock, Inc. $ 1,436 $ 1,199
Basic weighted-average shares outstanding 151,732,845 152,567,453
Total diluted weighted-average shares outstanding 153,530,395 154,301,812
Basic earnings per share $ 9.46 $ 7.86
Diluted earnings per share $ 9.35 $ 7.77
Restricted Stock Units (RSUs) [Member]    
Earnings Per Share Basic And Diluted [Line Items]    
Dilutive effect of 1,229,694 1,284,020
Stock Options [Member]    
Earnings Per Share Basic And Diluted [Line Items]    
Dilutive effect of 567,856 450,339