3.26.1 html 567 413 1 true 163 0 false 6 false false R1.htm 75000 - Document - Document and Entity Information Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 75010 - Statement - Condensed Consolidated Statements of Financial Condition Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_StatementCondensedConsolidatedStatementsOfFinancialCondition Condensed Consolidated Statements of Financial Condition Statements 2 false false R3.htm 75020 - Statement - Condensed Consolidated Statements of Financial Condition (Parenthetical) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_StatementCondensedConsolidatedStatementsOfFinancialConditionParenthetical Condensed Consolidated Statements of Financial Condition (Parenthetical) Statements 3 false false R4.htm 75030 - Statement - Condensed Consolidated Statements of Income Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_StatementCondensedConsolidatedStatementsOfIncome Condensed Consolidated Statements of Income Statements 4 false false R5.htm 75040 - Statement - Condensed Consolidated Statements of Comprehensive Income Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_StatementCondensedConsolidatedStatementsOfComprehensiveIncome Condensed Consolidated Statements of Comprehensive Income Statements 5 false false R6.htm 75050 - Statement - Condensed Consolidated Statements of Comprehensive Income (Parenthetical) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_StatementCondensedConsolidatedStatementsOfComprehensiveIncomeParenthetical Condensed Consolidated Statements of Comprehensive Income (Parenthetical) Statements 6 false false R7.htm 75060 - Statement - Condensed Consolidated Statements of Changes in Equity Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_StatementCondensedConsolidatedStatementsOfChangesInEquity Condensed Consolidated Statements of Changes in Equity Statements 7 false false R8.htm 75070 - Statement - Condensed Consolidated Statements of Changes in Equity (Parenthetical) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_StatementCondensedConsolidatedStatementsOfChangesInEquityParenthetical Condensed Consolidated Statements of Changes in Equity (Parenthetical) Statements 8 false false R9.htm 75080 - Statement - Condensed Consolidated Statements of Cash Flows Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_StatementCondensedConsolidatedStatementsOfCashFlows Condensed Consolidated Statements of Cash Flows Statements 9 false false R10.htm 995410 - Disclosure - Pay vs Performance Disclosure Sheet http://xbrl.sec.gov/ecd/role/PvpDisclosure Pay vs Performance Disclosure Notes 10 false false R11.htm 995445 - Disclosure - Insider Trading Arrangements Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements Insider Trading Arrangements Notes 11 false false R12.htm 995455 - Disclosure - Business Overview Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureBusinessOverview Business Overview Notes 12 false false R13.htm 995465 - Disclosure - Significant Accounting Policies Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureSignificantAccountingPolicies Significant Accounting Policies Notes 13 false false R14.htm 995475 - Disclosure - Acquisitions Sheet http://www.blackrock.com/20260331/taxonomy/role/DisclosureAcquisitions Acquisitions Notes 14 false false R15.htm 995485 - Disclosure - Cash, Cash Equivalents and Restricted Cash Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureCashCashEquivalentsAndRestrictedCash Cash, Cash Equivalents and Restricted Cash Notes 15 false false R16.htm 995495 - Disclosure - Investments Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureInvestments Investments Notes 16 false false R17.htm 995505 - Disclosure - Consolidated Sponsored Investment Products Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureConsolidatedSponsoredInvestmentProducts Consolidated Sponsored Investment Products Notes 17 false false R18.htm 995515 - Disclosure - Variable Interest Entities Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureVariableInterestEntities Variable Interest Entities Notes 18 false false R19.htm 995525 - Disclosure - Fair Value Disclosures Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureFairValueDisclosures Fair Value Disclosures Notes 19 false false R20.htm 995535 - Disclosure - Derivatives and Hedging Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureDerivativesAndHedging Derivatives and Hedging Notes 20 false false R21.htm 995545 - Disclosure - Goodwill Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureGoodwill Goodwill Notes 21 false false R22.htm 995555 - Disclosure - Intangible Assets Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureIntangibleAssets Intangible Assets Notes 22 false false R23.htm 995565 - Disclosure - Leases Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureLeases Leases Notes 23 false false R24.htm 995575 - Disclosure - Other Assets Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureOtherAssets Other Assets Notes 24 false false R25.htm 995585 - Disclosure - Borrowings Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureBorrowings Borrowings Notes 25 false false R26.htm 995595 - Disclosure - Commitments and Contingencies Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureCommitmentsAndContingencies Commitments and Contingencies Notes 26 false false R27.htm 995605 - Disclosure - Revenue Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureRevenue Revenue Notes 27 false false R28.htm 995615 - Disclosure - Stock-Based Compensation Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureStockBasedCompensation Stock-Based Compensation Notes 28 false false R29.htm 995625 - Disclosure - Related Party Transactions Sheet http://www.blackrock.com/20260331/taxonomy/role/DisclosureRelatedPartyTransactions Related Party Transactions Notes 29 false false R30.htm 995635 - Disclosure - Net Capital Requirements Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureNetCapitalRequirements Net Capital Requirements Notes 30 false false R31.htm 995645 - Disclosure - Accumulated Other Comprehensive Income (Loss) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureAccumulatedOtherComprehensiveIncomeLoss Accumulated Other Comprehensive Income (Loss) Notes 31 false false R32.htm 995655 - Disclosure - Capital Stock Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureCapitalStock Capital Stock Notes 32 false false R33.htm 995675 - Disclosure - Income Taxes Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureIncomeTaxes Income Taxes Notes 33 false false R34.htm 995685 - Disclosure - Earnings Per Share Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureEarningsPerShare Earnings Per Share Notes 34 false false R35.htm 995695 - Disclosure - Segment Information Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureSegmentInformation Segment Information Notes 35 false false R36.htm 995705 - Disclosure - Subsequent Events Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureSubsequentEvents Subsequent Events Notes 36 false false R37.htm 995715 - Disclosure - Significant Accounting Policies (Policies) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureSignificantAccountingPoliciesPolicies Significant Accounting Policies (Policies) Policies http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureSignificantAccountingPolicies 37 false false R38.htm 995725 - Disclosure - Acquisitions (Tables) Sheet http://www.blackrock.com/20260331/taxonomy/role/DisclosureAcquisitionsTables Acquisitions (Tables) Tables http://www.blackrock.com/20260331/taxonomy/role/DisclosureAcquisitions 38 false false R39.htm 995735 - Disclosure - Cash, Cash Equivalents and Restricted Cash (Tables) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureCashCashEquivalentsAndRestrictedCashTables Cash, Cash Equivalents and Restricted Cash (Tables) Tables http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureCashCashEquivalentsAndRestrictedCash 39 false false R40.htm 995745 - Disclosure - Investments (Tables) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureInvestmentsTables Investments (Tables) Tables http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureInvestments 40 false false R41.htm 995755 - Disclosure - Consolidated Sponsored Investment Products (Tables) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureConsolidatedSponsoredInvestmentProductsTables Consolidated Sponsored Investment Products (Tables) Tables http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureConsolidatedSponsoredInvestmentProducts 41 false false R42.htm 995765 - Disclosure - Variable Interest Entities (Tables) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureVariableInterestEntitiesTables Variable Interest Entities (Tables) Tables http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureVariableInterestEntities 42 false false R43.htm 995775 - Disclosure - Fair Value Disclosures (Tables) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureFairValueDisclosuresTables Fair Value Disclosures (Tables) Tables http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureFairValueDisclosures 43 false false R44.htm 995785 - Disclosure - Derivative and Hedging (Tables) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureDerivativeAndHedgingTables Derivative and Hedging (Tables) Tables 44 false false R45.htm 995795 - Disclosure - Goodwill (Tables) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureGoodwillTables Goodwill (Tables) Tables http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureGoodwill 45 false false R46.htm 995805 - Disclosure - Intangible Assets (Tables) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureIntangibleAssetsTables Intangible Assets (Tables) Tables http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureIntangibleAssets 46 false false R47.htm 995815 - Disclosure - Leases (Tables) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureLeasesTables Leases (Tables) Tables http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureLeases 47 false false R48.htm 995825 - Disclosure - Borrowings (Tables) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureBorrowingsTables Borrowings (Tables) Tables http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureBorrowings 48 false false R49.htm 995835 - Disclosure - Revenue (Tables) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureRevenueTables Revenue (Tables) Tables http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureRevenue 49 false false R50.htm 995845 - Disclosure - Stock-Based Compensation (Tables) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureStockBasedCompensationTables Stock-Based Compensation (Tables) Tables http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureStockBasedCompensation 50 false false R51.htm 995855 - Disclosure - Accumulated Other Comprehensive Income (Loss) (Tables) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureAccumulatedOtherComprehensiveIncomeLossTables Accumulated Other Comprehensive Income (Loss) (Tables) Tables http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureAccumulatedOtherComprehensiveIncomeLoss 51 false false R52.htm 995875 - Disclosure - Earnings Per Share (Tables) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureEarningsPerShareTables Earnings Per Share (Tables) Tables http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureEarningsPerShare 52 false false R53.htm 995885 - Disclosure - Segment Information (Tables) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureSegmentInformationTables Segment Information (Tables) Tables http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureSegmentInformation 53 false false R54.htm 995895 - Disclosure - Business Overview - Additional Information (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/DisclosureBusinessOverviewAdditionalInformationDetail Business Overview - Additional Information (Detail) Details 54 false false R55.htm 995905 - Disclosure - Significant Accounting Policies - Additional Information (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureSignificantAccountingPoliciesAdditionalInformationDetail Significant Accounting Policies - Additional Information (Detail) Details 55 false false R56.htm 995915 - Disclosure - Acquisitions - Additional Information (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail Acquisitions - Additional Information (Detail) Details 56 false false R57.htm 995925 - Disclosure - Acquisitions - Summary of Fair Values of Assets Acquired and Liabilities Assumed (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedDetail Acquisitions - Summary of Fair Values of Assets Acquired and Liabilities Assumed (Detail) Details 57 false false R58.htm 995935 - Disclosure - Acquisitions - Summary of Fair Values of Assets Acquired and Liabilities Assumed (Parenthetical) (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedParentheticalDetail Acquisitions - Summary of Fair Values of Assets Acquired and Liabilities Assumed (Parenthetical) (Detail) Details 58 false false R59.htm 995945 - Disclosure - Acquisitions - Summary of Business Acquisition, Pro Forma Information Combined Results of Operations (Details) Sheet http://www.blackrock.com/20260331/taxonomy/role/DisclosureAcquisitionsSummaryOfBusinessAcquisitionProFormaInformationCombinedResultsOfOperationsDetails Acquisitions - Summary of Business Acquisition, Pro Forma Information Combined Results of Operations (Details) Details 59 false false R60.htm 995965 - Disclosure - Cash, Cash Equivalents and Restricted Cash - Schedule of Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureCashCashEquivalentsAndRestrictedCashScheduleOfReconciliationOfCashCashEquivalentsAndRestrictedCashDetails Cash, Cash Equivalents and Restricted Cash - Schedule of Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) Details 60 false false R61.htm 995975 - Disclosure - Investments - Summary of Carrying Value of Total Investments (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureInvestmentsSummaryOfCarryingValueOfTotalInvestmentsDetail Investments - Summary of Carrying Value of Total Investments (Detail) Details 61 false false R62.htm 995995 - Disclosure - Investments - Summary of Carrying Value of Total Investments (Detail) (Parenthetical) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureInvestmentsSummaryOfCarryingValueOfTotalInvestmentsDetailParenthetical Investments - Summary of Carrying Value of Total Investments (Detail) (Parenthetical) Details 62 false false R63.htm 996005 - Disclosure - Investments - Additional Information (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureInvestmentsAdditionalInformationDetail Investments - Additional Information (Detail) Details 63 false false R64.htm 996015 - Disclosure - Investments - Summary of Cost and Carrying Value of Equity and Trading Debt Securities (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureInvestmentsSummaryOfCostAndCarryingValueOfEquityAndTradingDebtSecuritiesDetail Investments - Summary of Cost and Carrying Value of Equity and Trading Debt Securities (Detail) Details 64 false false R65.htm 996025 - Disclosure - Consolidated Sponsored Investment Products - Consolidated VIEs And VREs Recorded in Consolidated Statements of Financial Condition (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureConsolidatedSponsoredInvestmentProductsConsolidatedViesAndVresRecordedInConsolidatedStatementsOfFinancialConditionDetail Consolidated Sponsored Investment Products - Consolidated VIEs And VREs Recorded in Consolidated Statements of Financial Condition (Detail) Details 65 false false R66.htm 996035 - Disclosure - Consolidated Sponsored Investment Products - Schedule of Net Gain (Loss) Related to Consolidated VIEs (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureConsolidatedSponsoredInvestmentProductsScheduleOfNetGainLossRelatedToConsolidatedViesDetail Consolidated Sponsored Investment Products - Schedule of Net Gain (Loss) Related to Consolidated VIEs (Detail) Details 66 false false R67.htm 996045 - Disclosure - Variable Interest Entities Reflects adoption of ASU 2015-12 - Balances Relating to Variable Interest Entities in which BlackRock is Not Primary Beneficiary (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureVariableInterestEntitiesReflectsAdoptionOfASU201512BalancesRelatingToVariableInterestEntitiesInWhichBlackrockIsNotPrimaryBeneficiaryDetail Variable Interest Entities Reflects adoption of ASU 2015-12 - Balances Relating to Variable Interest Entities in which BlackRock is Not Primary Beneficiary (Detail) Details 67 false false R68.htm 996055 - Disclosure - Variable Interest Entities Reflects adoption of ASU 2015-12 - Additional Information (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureVariableInterestEntitiesReflectsAdoptionOfASU201512AdditionalInformationDetail Variable Interest Entities Reflects adoption of ASU 2015-12 - Additional Information (Detail) Details 68 false false R69.htm 996065 - Disclosure - Fair Value Disclosures - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureFairValueDisclosuresAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetail Fair Value Disclosures - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) Details 69 false false R70.htm 996085 - Disclosure - Fair Value Disclosures - Additional Information (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureFairValueDisclosuresAdditionalInformationDetail Fair Value Disclosures - Additional Information (Detail) Details 70 false false R71.htm 996095 - Disclosure - Fair Value Disclosures - Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureFairValueDisclosuresChangesInLevel3AssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetail Fair Value Disclosures - Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) Details 71 false false R72.htm 996115 - Disclosure - Fair Value Disclosures - Fair Value of Financial Assets and Financial Liabilities (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureFairValueDisclosuresFairValueOfFinancialAssetsAndFinancialLiabilitiesDetail Fair Value Disclosures - Fair Value of Financial Assets and Financial Liabilities (Detail) Details 72 false false R73.htm 996125 - Disclosure - Fair Value Disclosures - Fair Value of Financial Assets and Financial Liabilities (Parenthetical) (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureFairValueDisclosuresFairValueOfFinancialAssetsAndFinancialLiabilitiesParentheticalDetail Fair Value Disclosures - Fair Value of Financial Assets and Financial Liabilities (Parenthetical) (Detail) Details 73 false false R74.htm 996135 - Disclosure - Fair Value Disclosures - Investments in Certain Entities Calculate Net Asset Value per Share (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureFairValueDisclosuresInvestmentsInCertainEntitiesCalculateNetAssetValuePerShareDetail Fair Value Disclosures - Investments in Certain Entities Calculate Net Asset Value per Share (Detail) Details 74 false false R75.htm 996145 - Disclosure - Fair Value Disclosures - Investments in Certain Entities Calculate Net Asset Value per Share (Parenthetical) (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureFairValueDisclosuresInvestmentsInCertainEntitiesCalculateNetAssetValuePerShareParentheticalDetail Fair Value Disclosures - Investments in Certain Entities Calculate Net Asset Value per Share (Parenthetical) (Detail) Details 75 false false R76.htm 996155 - Disclosure - Fair Value Disclosures - Summary of Information Related to Bank Loans and Borrowings of Consolidated CLO Recorded within Investments and Borrowings of Consolidated VIEs Respectively for which Fair Value Option was Elected (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/DisclosureFairValueDisclosuresSummaryOfInformationRelatedToBankLoansAndBorrowingsOfConsolidatedCloRecordedWithinInvestmentsAndBorrowingsO Fair Value Disclosures - Summary of Information Related to Bank Loans and Borrowings of Consolidated CLO Recorded within Investments and Borrowings of Consolidated VIEs Respectively for which Fair Value Option was Elected (Detail) Details 76 false false R77.htm 996165 - Disclosure - Derivatives and Hedging - Additional Information (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureDerivativesAndHedgingAdditionalInformationDetail Derivatives and Hedging - Additional Information (Detail) Details 77 false false R78.htm 996175 - Disclosure - Derivatives and Hedging - Summary of Fair Values of Derivatives Instruments Recognized in Consolidated Statements of Financial Condition (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureDerivativesAndHedgingSummaryOfFairValuesOfDerivativesInstrumentsRecognizedInConsolidatedStatementsOfFinancialConditionDetail Derivatives and Hedging - Summary of Fair Values of Derivatives Instruments Recognized in Consolidated Statements of Financial Condition (Detail) Details 78 false false R79.htm 996185 - Disclosure - Derivatives and Hedging - Summary of Realized and Unrealized Gains (Losses) Recognized in Condensed Consolidated Statements of Income on Derivative Instruments (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureDerivativesAndHedgingSummaryOfRealizedAndUnrealizedGainsLossesRecognizedInCondensedConsolidatedStatementsOfIncomeOnDerivativeInstrumentsDetail Derivatives and Hedging - Summary of Realized and Unrealized Gains (Losses) Recognized in Condensed Consolidated Statements of Income on Derivative Instruments (Detail) Details 79 false false R80.htm 996195 - Disclosure - Derivatives and Hedging - Summary of Realized and Unrealized Gains (Losses) Recognized in Condensed Consolidated Statements of Income on Derivative Instruments (Parenthetical) (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/DisclosureDerivativesAndHedgingSummaryOfRealizedAndUnrealizedGainsLossesRecognizedInCondensedConsolidatedStatementsOfIncomeOnDerivativeIns1 Derivatives and Hedging - Summary of Realized and Unrealized Gains (Losses) Recognized in Condensed Consolidated Statements of Income on Derivative Instruments (Parenthetical) (Detail) Details 80 false false R81.htm 996205 - Disclosure - Goodwill - Goodwill Activity (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureGoodwillGoodwillActivityDetail Goodwill - Goodwill Activity (Detail) Details 81 false false R82.htm 996215 - Disclosure - Intangible Assets - Carrying Amounts of Identifiable Intangible Assets (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureIntangibleAssetsCarryingAmountsOfIdentifiableIntangibleAssetsDetail Intangible Assets - Carrying Amounts of Identifiable Intangible Assets (Detail) Details 82 false false R83.htm 996235 - Disclosure - Leases - Components of Lease Cost (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureLeasesComponentsOfLeaseCostDetail Leases - Components of Lease Cost (Detail) Details 83 false false R84.htm 996245 - Disclosure - Leases - Schedule of Supplemental Information Related to Operating Leases (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureLeasesScheduleOfSupplementalInformationRelatedToOperatingLeasesDetail Leases - Schedule of Supplemental Information Related to Operating Leases (Detail) Details 84 false false R85.htm 996255 - Disclosure - Leases - Schedule of Supplemental Information Related to Operating Leases (Parenthetical) (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/DisclosureLeasesScheduleOfSupplementalInformationRelatedToOperatingLeasesParentheticalDetail Leases - Schedule of Supplemental Information Related to Operating Leases (Parenthetical) (Detail) Details 85 false false R86.htm 996265 - Disclosure - Other Assets - Additional Information (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureOtherAssetsAdditionalInformationDetail Other Assets - Additional Information (Detail) Details 86 false false R87.htm 996275 - Disclosure - Borrowings - Additional Information (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureBorrowingsAdditionalInformationDetail Borrowings - Additional Information (Detail) Details 87 false false R88.htm 996285 - Disclosure - Borrowings - Carrying Value and Fair Value of Long-Term Borrowings Determined Market Prices EUR/USD Foreign Exchange Rate (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/DisclosureBorrowingsCarryingValueAndFairValueOfLongtermBorrowingsDeterminedMarketPricesEurusdForeignExchangeRateDetail Borrowings - Carrying Value and Fair Value of Long-Term Borrowings Determined Market Prices EUR/USD Foreign Exchange Rate (Detail) Details 88 false false R89.htm 996295 - Disclosure - Commitments and Contingencies - Additional Information (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureCommitmentsAndContingenciesAdditionalInformationDetail Commitments and Contingencies - Additional Information (Detail) Details 89 false false R90.htm 996305 - Disclosure - Revenue - Summary of Investment Advisory, Administration Fees and Securities Lending Revenue by Type (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureRevenueSummaryOfInvestmentAdvisoryAdministrationFeesAndSecuritiesLendingRevenueByTypeDetail Revenue - Summary of Investment Advisory, Administration Fees and Securities Lending Revenue by Type (Detail) Details 90 false false R91.htm 996315 - Disclosure - Revenue - Summary of Investment Advisory, Administration Fees and Securities Lending Revenue by Type (Parenthetical) (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/DisclosureRevenueSummaryOfInvestmentAdvisoryAdministrationFeesAndSecuritiesLendingRevenueByTypeParentheticalDetail Revenue - Summary of Investment Advisory, Administration Fees and Securities Lending Revenue by Type (Parenthetical) (Detail) Details 91 false false R92.htm 996325 - Disclosure - Revenue - Summary of Investment Advisory, Administration Fees and Securities Lending Revenue by Client Type and Investment Style (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureRevenueSummaryOfInvestmentAdvisoryAdministrationFeesAndSecuritiesLendingRevenueByClientTypeAndInvestmentStyleDetail Revenue - Summary of Investment Advisory, Administration Fees and Securities Lending Revenue by Client Type and Investment Style (Detail) Details 92 false false R93.htm 996335 - Disclosure - Revenue - Schedule of Estimated Investment Advisory, Administration Fees Expected to be Recognized in Future, Related to Unsatisfied Portion of Performance Obligations (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureRevenueScheduleOfEstimatedInvestmentAdvisoryAdministrationFeesExpectedToBeRecognizedInFutureRelatedToUnsatisfiedPortionOfPerformanceObligationsDetail Revenue - Schedule of Estimated Investment Advisory, Administration Fees Expected to be Recognized in Future, Related to Unsatisfied Portion of Performance Obligations (Detail) Details 93 false false R94.htm 996345 - Disclosure - Revenue - Schedule of Estimated Investment Advisory, Administration Fees Expected to be Recognized in Future, Related to Unsatisfied Portion of Performance Obligations (Detail 1) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureRevenueScheduleOfEstimatedInvestmentAdvisoryAdministrationFeesExpectedToBeRecognizedInFutureRelatedToUnsatisfiedPortionOfPerformanceObligationsDetail1 Revenue - Schedule of Estimated Investment Advisory, Administration Fees Expected to be Recognized in Future, Related to Unsatisfied Portion of Performance Obligations (Detail 1) Details 94 false false R95.htm 996355 - Disclosure - Revenue - Schedule of Changes in Deferred Carried Interest Liability (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureRevenueScheduleOfChangesInDeferredCarriedInterestLiabilityDetail Revenue - Schedule of Changes in Deferred Carried Interest Liability (Detail) Details 95 false false R96.htm 996365 - Disclosure - Revenue - Schedule of Estimated Technology Services and Subscription Revenue Expected to Be Recognized in Future, Related to Unsatisfied Portion of Performance Obligations (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/DisclosureRevenueScheduleOfEstimatedTechnologyServicesAndSubscriptionRevenueExpectedToBeRecognizedInFutureRelatedToUnsatisfiedPortionOfPe Revenue - Schedule of Estimated Technology Services and Subscription Revenue Expected to Be Recognized in Future, Related to Unsatisfied Portion of Performance Obligations (Detail) Details 96 false false R97.htm 996375 - Disclosure - Revenue - Schedule of Estimated Technology Services and Subscription Revenue Expected to Be Recognized in Future, Related to Unsatisfied Portion of Performance Obligations (Detail 1) Sheet http://www.blackrock.com/20260331/taxonomy/role/DisclosureRevenueScheduleOfEstimatedTechnologyServicesAndSubscriptionRevenueExpectedToBeRecognizedInFutureRelatedToUnsatisfiedPortionOfPe1 Revenue - Schedule of Estimated Technology Services and Subscription Revenue Expected to Be Recognized in Future, Related to Unsatisfied Portion of Performance Obligations (Detail 1) Details 97 false false R98.htm 996385 - Disclosure - Revenue - Additional Information (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureRevenueAdditionalInformationDetail Revenue - Additional Information (Detail) Details 98 false false R99.htm 996395 - Disclosure - Revenue - Schedule of Changes in Technology Services and Subscription Deferred Revenue Liability (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/DisclosureRevenueScheduleOfChangesInTechnologyServicesAndSubscriptionDeferredRevenueLiabilityDetail Revenue - Schedule of Changes in Technology Services and Subscription Deferred Revenue Liability (Detail) Details 99 false false R100.htm 996405 - Disclosure - Stock-Based Compensation - Restricted Stock and RSU Activity (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/DisclosureStockbasedCompensationRestrictedStockAndRsuActivityDetail Stock-Based Compensation - Restricted Stock and RSU Activity (Detail) Details 100 false false R101.htm 996415 - Disclosure - Stock-Based Compensation - Additional Information (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureStockBasedCompensationAdditionalInformationDetail Stock-Based Compensation - Additional Information (Detail) Details 101 false false R102.htm 996425 - Disclosure - Stock-Based Compensation - Stock Option Activity (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureStockBasedCompensationStockOptionActivityDetail Stock-Based Compensation - Stock Option Activity (Detail) Details 102 false false R103.htm 996435 - Disclosure - Stock-Based Compensation - Stock Option Activity 1 (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/DisclosureStockbasedCompensationStockOptionActivity1Detail Stock-Based Compensation - Stock Option Activity 1 (Detail) Details 103 false false R104.htm 996455 - Disclosure - Related Party Transactions - Additional Information (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/DisclosureRelatedPartyTransactionsAdditionalInformationDetail Related Party Transactions - Additional Information (Detail) Details 104 false false R105.htm 996465 - Disclosure - Net Capital Requirements - Additional Information (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureNetCapitalRequirementsAdditionalInformationDetail Net Capital Requirements - Additional Information (Detail) Details 105 false false R106.htm 996475 - Disclosure - Accumulated Other Comprehensive Income (Loss) - Changes in AOCI (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureAccumulatedOtherComprehensiveIncomeLossChangesInAOCIDetail Accumulated Other Comprehensive Income (Loss) - Changes in AOCI (Detail) Details http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureAccumulatedOtherComprehensiveIncomeLossTables 106 false false R107.htm 996485 - Disclosure - Accumulated Other Comprehensive Income (Loss) - Changes in AOCI (Parenthetical) (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureAccumulatedOtherComprehensiveIncomeLossChangesInAOCIParentheticalDetail Accumulated Other Comprehensive Income (Loss) - Changes in AOCI (Parenthetical) (Detail) Details http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureAccumulatedOtherComprehensiveIncomeLossTables 107 false false R108.htm 996495 - Disclosure - Capital Stock - Additional Information (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureCapitalStockAdditionalInformationDetail Capital Stock - Additional Information (Detail) Details 108 false false R109.htm 996525 - Disclosure - Income Taxes - Additional Information (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureIncomeTaxesAdditionalInformationDetail Income Taxes - Additional Information (Detail) Details 109 false false R110.htm 996535 - Disclosure - Earnings Per Share - Computation of Basic and Diluted Earnings per Share ("EPS") under Treasury Stock Method (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureEarningsPerShareComputationOfBasicAndDilutedEarningsPerShareEPSUnderTreasuryStockMethodDetail Earnings Per Share - Computation of Basic and Diluted Earnings per Share ("EPS") under Treasury Stock Method (Detail) Details 110 false false R111.htm 996545 - Disclosure - Earnings Per Share - Additional Information (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureEarningsPerShareAdditionalInformationDetail Earnings Per Share - Additional Information (Detail) Details 111 false false R112.htm 996555 - Disclosure - Segment Information - Additional Information (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureSegmentInformationAdditionalInformationDetail Segment Information - Additional Information (Detail) Details 112 false false R113.htm 996565 - Disclosure - Segment Information - Total Revenue by Geographic Region (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureSegmentInformationTotalRevenueByGeographicRegionDetail Segment Information - Total Revenue by Geographic Region (Detail) Details 113 false false R114.htm 996575 - Disclosure - Segment Information - Schedule of Long-Lived Assets by Geographic Region (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/Role_DisclosureSegmentInformationScheduleOfLongLivedAssetsByGeographicRegionDetail Segment Information - Schedule of Long-Lived Assets by Geographic Region (Detail) Details 114 false false R115.htm 996585 - Disclosure - Subsequent Events - Additional Information (Detail) Sheet http://www.blackrock.com/20260331/taxonomy/role/DisclosureSubsequentEventsAdditionalInformationDetail Subsequent Events - Additional Information (Detail) Details 115 false false All Reports Book All Reports blk-20260331.htm blk-20260331.xsd img224713986_0.jpg http://fasb.org/us-gaap/2025 http://xbrl.sec.gov/dei/2025 http://xbrl.sec.gov/ecd/2025 false false