v3.24.0.1
Stock-Based Compensation - Schedule of Fair Value of Market Performance-Based Award at Grant Date (Detail)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2017
Performance-Based Stock Options [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected Term (Years) 6 years 7 days [1] 6 years 6 months 21 days [2]
Expected Stock Volatility 27.73% [3] 22.23% [4]
Expected Dividend Yield 3.02% [5] 2.16% [6]
Risk-Free Interest Rate 3.61% [7] 2.33% [8]
Time Based Stock Options Member    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected Term (Years) [9] 7 years 1 month 17 days  
Expected Stock Volatility [3] 28.29%  
Expected Dividend Yield [5] 3.02%  
Risk-Free Interest Rate [7] 3.65%  
[1] The expected term was derived using a Monte Carlo simulation with the embedded lattice model and represents the period of time that options granted are expected to be outstanding.
[2] The expected term was derived using a Monte Carlo simulation with the embedded lattice model and represents the period of time that options granted are expected to be outstanding.
[3] The expected stock volatility was based upon an average of historical stock price fluctuations of BlackRock’s common stock and an implied volatility at the grant date.
[4] The expected stock volatility was based upon an average of historical stock price fluctuations of BlackRock’s common stock and an implied volatility at the grant date.
[5] The expected dividend yield was calculated as the most recent quarterly dividend divided by the average three-month stock price as of the grant date.
[6] The expected dividend yield was calculated as the most recent quarterly dividend divided by the average three-month stock price as of the grant date.
[7] The risk-free interest rate is based on the US Treasury Constant Maturities yield curve at grant date.
[8] The risk-free interest rate is based on the US Treasury Constant Maturities yield curve at grant date.
[9] The expected term represents the period of time that options granted are expected to be outstanding, and was calculated as the midpoint between the weighted average time to vest and expiration.