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Stock-Based Compensation - Schedule of Fair Value of Market Performance-Based Award at Grant Date (Detail) | 12 Months Ended
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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 | [10] | 28.29% |  |  |
Expected Dividend Yield | [11] | 3.02% |  |  |
Risk-Free Interest Rate | [12] | 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.
[10] | 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.
[11] | 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.
[12] | The risk-free interest rate is based on the US Treasury Constant Maturities yield curve at grant date.

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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Line items represent financial concepts included in a table. 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