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Revenue - Summary of Investment Advisory, Administration Fees and Securities Lending Revenue by Client Type and Investment Style (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue |  | $ 24,216 | $ 20,407 | $ 17,859
Revenue by Client Type [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | [1] | 19,179 | 16,100 | 14,399
Revenue by Client Type [Member] | Retail [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | [1] | 4,534 | 4,284 | 4,115
Revenue by Client Type [Member] | Equity ETFs [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | [1] | 8,077 | 6,738 | 5,833
Revenue by Client Type [Member] | Institutional Active [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | [1] | 4,313 | 3,089 | 2,624
Revenue by Client Type [Member] | Institutional Index [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | [1] | 1,010 | 940 | 918
Revenue by Client Type [Member] | Institutional [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | [1] | 5,323 | 4,029 | 3,542
Revenue by Client Type [Member] | Cash Management [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | [1] | 1,245 | 1,049 | 909
Revenue by Client Type [Member] | Long-term [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | [1] | 17,934 | 15,051 | 13,490
Revenue by Investment Style [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | [1] | 19,179 | 16,100 | 14,399
Revenue by Investment Style [Member] | Equity ETFs [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | [1] | 8,077 | 6,738 | 5,833
Revenue by Investment Style [Member] | Equity Non ETFs [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | [1] | 1,321 | 1,183 | 1,127
Revenue by Investment Style [Member] | Active [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | [1] | 8,536 | 7,130 | 6,530
Revenue by Investment Style [Member] | Cash Management [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | [1] | 1,245 | 1,049 | 909
Revenue by Investment Style [Member] | Long-term [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | [1] | $ 17,934 | $ 15,051 | $ 13,490
[1] | Beginning in the first quarter of 2025, BlackRock reclassified the presentation of the Company's investment advisory, administration fees and securities lending revenue line items to align with the updated presentation of the Company's AUM line items. Such line items have been reclassified for 2024 and 2023 to conform to this new presentation. See page 11 of Exhibit 99.2 to the Current Report on Form 8-K furnished on April 11, 2025 for the reclassified presentation of the 2024 and 2023 investment advisory, administration fees and securities lending revenue line items.

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