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v3.25.4

Revenue - Schedule of Changes in Technology Services and Subscription Deferred Revenue 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 |  | $ 124 | $ 133
Acquisition | [1] | 3 | 0
Additions | [2] | 218 | 84
Revenue recognized that was included in the beginning balance |  | (85) | (93)
Ending balance |  | $ 260 | $ 124
[1] | Amount for 2025 includes deferred revenue acquired in connection with the Preqin Transaction, net of revenue recognized. See Note 3, Acquisitions, for information on the Preqin Transaction.
[2] | Amounts are net of revenue recognized.

X
- Definition Acquisition to technology services and subscription deferred revenue liability. + References No definition available. + Details
Name: | blk_AcquisitionToTechnologyServicesSubscriptionDeferredRevenueLiability
Namespace Prefix: | blk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Additions to technology services and subscription deferred revenue liability. + References No definition available. + Details
Name: | blk_AdditionsToTechnologyServicesSubscriptionDeferredRevenueLiability
Namespace Prefix: | blk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Technology services and subscription deferred revenue liability. + References No definition available. + Details
Name: | blk_TechnologyServicesSubscriptionDeferredRevenueLiability
Namespace Prefix: | blk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Technology services and subscription deferred revenue recognized that included in beginning balance and acquisition balance. + References No definition available. + Details
Name: | blk_TechnologyServicesSubscriptionDeferredRevenueRecognizedThatIncludedInBeginningBalanceAndAcquisitionBalance
Namespace Prefix: | blk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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