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Revenue - Summary of Investment Advisory, Administration Fees and Securities Lending Revenue by Type (Parenthetical) (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Disaggregation of Revenue [Line Items]        
Securities lending revenue earned $ 5,423 $ 4,805 $ 10,699 $ 9,533
Investment Advisory, Administration Fees and Securities Lending Revenue [Member]        
Disaggregation of Revenue [Line Items]        
Securities lending revenue earned [1],[2] 4,454 3,875 8,855 7,653
Securities Lending Revenue [Member] | Investment Advisory, Administration Fees and Securities Lending Revenue [Member]        
Disaggregation of Revenue [Line Items]        
Securities lending revenue earned $ 171 $ 154 $ 328 $ 305
[1] Amounts include securities lending revenue of $171 million and $154 million for the three months ended June 30, 2025 and 2024, respectively, and $328 million and $305 million for the six months ended June 30, 2025 and 2024, 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 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 investment advisory, administration fees and securities lending revenue line items.