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Revenue - Summary of Investment Advisory, Administration Fees and Securities Lending Revenue by Type (Parenthetical) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disaggregation of Revenue [Line Items]      
Securities lending revenue earned $ 24,216 $ 20,407 $ 17,859
Investment Advisory, Administration Fees and Securities Lending Revenue [Member]      
Disaggregation of Revenue [Line Items]      
Securities lending revenue earned [1],[2] 19,179 16,100 14,399
Securities Lending Revenue [Member] | Investment Advisory, Administration Fees and Securities Lending Revenue [Member]      
Disaggregation of Revenue [Line Items]      
Securities lending revenue earned $ 705 $ 615 $ 675
[1] Amounts include $705 million, $615 million and $675 million of securities lending revenue for 2025, 2024 and 2023, respectively.
[2] 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.