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Revenue - Schedule of Changes in Deferred Carried Interest Liability (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Revenue from Contract with Customer [Abstract] |  |  |
Beginning balance |  | $ 1,860 | $ 1,783
Acquisition | [1] | 1,441 | 0
Net increase (decrease) in unrealized allocations |  | 706 | 364
Performance fee revenue recognized |  | (492) | (287)
Ending balance |  | $ 3,515 | $ 1,860
[1] | Amount for 2025 includes deferred carried interest acquired in connection with the HPS Transaction. See Note 3, Acquisitions, for information on the HPS Transaction.

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- Definition Deferred carried interest liability. + References No definition available. + Details
Name: | blk_DeferredCarriedInterestLiability
Namespace Prefix: | blk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Deferred carried interest liability acquisitions. + References No definition available. + Details
Name: | blk_DeferredCarriedInterestLiabilityAcquisitions
Namespace Prefix: | blk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Increase (decrease) in deferred interest liability due to unrealized allocations. + References No definition available. + Details
Name: | blk_IncreaseDecreaseInDeferredInterestLiabilityDueToUnrealizedAllocations
Namespace Prefix: | blk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Performance fee revenue recognized. + References No definition available. + Details
Name: | blk_PerformanceFeeRevenueRecognized
Namespace Prefix: | blk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration