v2.4.1.9

Summary of Quantitative Inputs and Assumptions for Items Categorized in Level III of Fair Value Hierarchy (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair value assets | 6,444,914 us-gaap_AssetsFairValueDisclosure |  | 6,760,099 us-gaap_AssetsFairValueDisclosure |
Fair value liabilities | 6,933,747 us-gaap_LiabilitiesFairValueDisclosure |  | 6,797,104 us-gaap_LiabilitiesFairValueDisclosure |
Level 3 |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair value assets | 3,803,853 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  | 3,740,693 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
Discounted Cash Flows | Liabilities of Consolidated CLO Vehicles |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Default Rate | 2.00%us-gaap_FairValueInputsProbabilityOfDefault / us-gaap_FairValueByLiabilityClassAxis = bx_LiabilitiesOfConsolidatedCloVehiclesMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 2.00%us-gaap_FairValueInputsProbabilityOfDefault / us-gaap_FairValueByLiabilityClassAxis = bx_LiabilitiesOfConsolidatedCloVehiclesMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Recovery Lag | 12 months |  | 12 months |
Pre-payment Rate | 20.00%us-gaap_FairValueInputsPrepaymentRate / us-gaap_FairValueByLiabilityClassAxis = bx_LiabilitiesOfConsolidatedCloVehiclesMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 20.00%us-gaap_FairValueInputsPrepaymentRate / us-gaap_FairValueByLiabilityClassAxis = bx_LiabilitiesOfConsolidatedCloVehiclesMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Discounted Cash Flows | Liabilities of Consolidated CLO Vehicles | Level 3 |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair value liabilities | 6,933,747 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByLiabilityClassAxis = bx_LiabilitiesOfConsolidatedCloVehiclesMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 6,797,104 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByLiabilityClassAxis = bx_LiabilitiesOfConsolidatedCloVehiclesMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Discounted Cash Flows | Liabilities of Consolidated CLO Vehicles | LIBOR |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Reinvestment Rate | 4.00%bx_FairValueInputsReinvestmentRate / us-gaap_FairValueByLiabilityClassAxis = bx_LiabilitiesOfConsolidatedCloVehiclesMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  | 4.00%bx_FairValueInputsReinvestmentRate / us-gaap_FairValueByLiabilityClassAxis = bx_LiabilitiesOfConsolidatedCloVehiclesMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |
Discounted Cash Flows | Weighted Average | Liabilities of Consolidated CLO Vehicles |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Discount Rate | 2.90%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByLiabilityClassAxis = bx_LiabilitiesOfConsolidatedCloVehiclesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember | [1] | 2.30%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByLiabilityClassAxis = bx_LiabilitiesOfConsolidatedCloVehiclesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember | [1]
Recovery Rate | 66.00%bx_FairValueInputsRecoveryRate / us-gaap_FairValueByLiabilityClassAxis = bx_LiabilitiesOfConsolidatedCloVehiclesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember | [1] | 66.00%bx_FairValueInputsRecoveryRate / us-gaap_FairValueByLiabilityClassAxis = bx_LiabilitiesOfConsolidatedCloVehiclesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember | [1]
Discounted Cash Flows | Minimum | Liabilities of Consolidated CLO Vehicles |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Discount Rate | 0.60%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByLiabilityClassAxis = bx_LiabilitiesOfConsolidatedCloVehiclesMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 0.30%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByLiabilityClassAxis = bx_LiabilitiesOfConsolidatedCloVehiclesMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Recovery Rate | 30.00%bx_FairValueInputsRecoveryRate / us-gaap_FairValueByLiabilityClassAxis = bx_LiabilitiesOfConsolidatedCloVehiclesMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 30.00%bx_FairValueInputsRecoveryRate / us-gaap_FairValueByLiabilityClassAxis = bx_LiabilitiesOfConsolidatedCloVehiclesMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Discounted Cash Flows | Maximum | Liabilities of Consolidated CLO Vehicles |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Discount Rate | 29.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByLiabilityClassAxis = bx_LiabilitiesOfConsolidatedCloVehiclesMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 19.30%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByLiabilityClassAxis = bx_LiabilitiesOfConsolidatedCloVehiclesMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Recovery Rate | 70.00%bx_FairValueInputsRecoveryRate / us-gaap_FairValueByLiabilityClassAxis = bx_LiabilitiesOfConsolidatedCloVehiclesMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 70.00%bx_FairValueInputsRecoveryRate / us-gaap_FairValueByLiabilityClassAxis = bx_LiabilitiesOfConsolidatedCloVehiclesMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Blackstone's Treasury Cash Management Strategies | Discounted Cash Flows |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Default Rate | 1.00%us-gaap_FairValueInputsProbabilityOfDefault / us-gaap_FairValueByAssetClassAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  |  |
Discount Rate |  |  | 1.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Recovery Lag | 12 months |  | 12 months |
Pre-payment Rate | 30.00%us-gaap_FairValueInputsPrepaymentRate / us-gaap_FairValueByAssetClassAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 30.00%us-gaap_FairValueInputsPrepaymentRate / us-gaap_FairValueByAssetClassAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Blackstone's Treasury Cash Management Strategies | Discounted Cash Flows | Level 3 |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair value assets | 28,238 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 26,167 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Blackstone's Treasury Cash Management Strategies | Discounted Cash Flows | LIBOR |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Reinvestment Rate | 4.50%bx_FairValueInputsReinvestmentRate / us-gaap_FairValueByAssetClassAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  | 4.50%bx_FairValueInputsReinvestmentRate / us-gaap_FairValueByAssetClassAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |
Blackstone's Treasury Cash Management Strategies | Discounted Cash Flows | Weighted Average |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Discount Rate | 6.80%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember | [1] | 7.20%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember | [1]
Recovery Rate | 66.00%bx_FairValueInputsRecoveryRate / us-gaap_FairValueByAssetClassAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember | [1] | 66.00%bx_FairValueInputsRecoveryRate / us-gaap_FairValueByAssetClassAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember | [1]
Blackstone's Treasury Cash Management Strategies | Discounted Cash Flows | Minimum |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Discount Rate | 5.80%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 5.80%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Recovery Rate | 30.00%bx_FairValueInputsRecoveryRate / us-gaap_FairValueByAssetClassAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 30.00%bx_FairValueInputsRecoveryRate / us-gaap_FairValueByAssetClassAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Blackstone's Treasury Cash Management Strategies | Discounted Cash Flows | Maximum |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Discount Rate | 10.20%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 10.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Recovery Rate | 70.00%bx_FairValueInputsRecoveryRate / us-gaap_FairValueByAssetClassAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 70.00%bx_FairValueInputsRecoveryRate / us-gaap_FairValueByAssetClassAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Blackstone's Treasury Cash Management Strategies | Net Asset Value Valuation Technique | Level 3 |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair value assets | 10,095 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = bx_NetAssetValueValuationTechniqueMember |  | 10,159 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = bx_NetAssetValueValuationTechniqueMember |
Blackstone's Treasury Cash Management Strategies | Transaction Price Valuation Technique | Level 3 |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair value assets | 3,141 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = bx_TransactionPriceValuationTechniqueMember |  | 4,470 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = bx_TransactionPriceValuationTechniqueMember |
Blackstone's Treasury Cash Management Strategies | Third Party Pricing Valuation Technique | Level 3 |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair value assets | 33,437 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = bx_ThirdPartyPricingValuationTechniqueMember |  | 54,257 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = bx_ThirdPartyPricingValuationTechniqueMember |
Loans And Receivables | Discounted Cash Flows | Level 3 |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair value assets | 19,878 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_LoansAndReceivablesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 26,247 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_LoansAndReceivablesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Loans And Receivables | Discounted Cash Flows | Weighted Average |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Discount Rate | 17.30%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = bx_LoansAndReceivablesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember | [1] | 10.90%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = bx_LoansAndReceivablesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember | [1]
Loans And Receivables | Discounted Cash Flows | Minimum |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Discount Rate | 16.90%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = bx_LoansAndReceivablesMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 10.50%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = bx_LoansAndReceivablesMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Loans And Receivables | Discounted Cash Flows | Maximum |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Discount Rate | 17.40%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = bx_LoansAndReceivablesMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 12.20%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = bx_LoansAndReceivablesMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Loans And Receivables | Transaction Price Valuation Technique | Level 3 |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair value assets | 20,813 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_LoansAndReceivablesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = bx_TransactionPriceValuationTechniqueMember |  | 14,150 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_LoansAndReceivablesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = bx_TransactionPriceValuationTechniqueMember |
Other | Discounted Cash Flows |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Default Rate | 2.00%us-gaap_FairValueInputsProbabilityOfDefault / us-gaap_FairValueByAssetClassAxis = bx_InvestmentAssetOtherMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 2.00%us-gaap_FairValueInputsProbabilityOfDefault / us-gaap_FairValueByAssetClassAxis = bx_InvestmentAssetOtherMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Recovery Lag | 12 months |  | 12 months |
Pre-payment Rate | 20.00%us-gaap_FairValueInputsPrepaymentRate / us-gaap_FairValueByAssetClassAxis = bx_InvestmentAssetOtherMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 20.00%us-gaap_FairValueInputsPrepaymentRate / us-gaap_FairValueByAssetClassAxis = bx_InvestmentAssetOtherMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Other | Discounted Cash Flows | Level 3 |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair value assets | 82,370 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_InvestmentAssetOtherMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 92,604 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_InvestmentAssetOtherMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Other | Discounted Cash Flows | LIBOR |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Reinvestment Rate | 4.50%bx_FairValueInputsReinvestmentRate / us-gaap_FairValueByAssetClassAxis = bx_InvestmentAssetOtherMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  | 4.00%bx_FairValueInputsReinvestmentRate / us-gaap_FairValueByAssetClassAxis = bx_InvestmentAssetOtherMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |
Other | Discounted Cash Flows | Weighted Average |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Discount Rate | 3.30%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = bx_InvestmentAssetOtherMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember | [1] | 2.90%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = bx_InvestmentAssetOtherMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember | [1]
Recovery Rate | 66.00%bx_FairValueInputsRecoveryRate / us-gaap_FairValueByAssetClassAxis = bx_InvestmentAssetOtherMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember | [1] | 66.00%bx_FairValueInputsRecoveryRate / us-gaap_FairValueByAssetClassAxis = bx_InvestmentAssetOtherMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember | [1]
Other | Discounted Cash Flows | Minimum |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Discount Rate | 1.60%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = bx_InvestmentAssetOtherMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 1.30%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = bx_InvestmentAssetOtherMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Recovery Rate | 30.00%bx_FairValueInputsRecoveryRate / us-gaap_FairValueByAssetClassAxis = bx_InvestmentAssetOtherMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 30.00%bx_FairValueInputsRecoveryRate / us-gaap_FairValueByAssetClassAxis = bx_InvestmentAssetOtherMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Other | Discounted Cash Flows | Maximum |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Discount Rate | 12.50%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = bx_InvestmentAssetOtherMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 12.50%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = bx_InvestmentAssetOtherMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Recovery Rate | 70.00%bx_FairValueInputsRecoveryRate / us-gaap_FairValueByAssetClassAxis = bx_InvestmentAssetOtherMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 70.00%bx_FairValueInputsRecoveryRate / us-gaap_FairValueByAssetClassAxis = bx_InvestmentAssetOtherMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Other | Net Asset Value Valuation Technique | Level 3 |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair value assets | 12,694 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_InvestmentAssetOtherMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = bx_NetAssetValueValuationTechniqueMember |  | 2,719 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_InvestmentAssetOtherMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = bx_NetAssetValueValuationTechniqueMember |
Other | Transaction Price Valuation Technique | Level 3 |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair value assets | 16,612 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_InvestmentAssetOtherMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = bx_TransactionPriceValuationTechniqueMember |  | 11,887 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_InvestmentAssetOtherMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = bx_TransactionPriceValuationTechniqueMember |
Investments Of Consolidated Blackstone Funds | Level 3 |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair value assets | 3,576,575 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember |  | 3,498,033 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember |
Investments Of Consolidated Blackstone Funds | Equity Securities | Discounted Cash Flows | Level 3 |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair value assets | 118,199 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 106,727 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Investments Of Consolidated Blackstone Funds | Equity Securities | Discounted Cash Flows | Weighted Average |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Discount Rate | 11.90%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember | [1] | 11.80%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember | [1]
Revenue CAGR | 7.00%us-gaap_FairValueInputsLongTermRevenueGrowthRate / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember | [1] | 7.10%us-gaap_FairValueInputsLongTermRevenueGrowthRate / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember | [1]
Exit Multiple - EBITDA | 10.0 bx_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationExitMultiple / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember | [1] | 10.1 bx_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationExitMultiple / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember | [1]
Exit Multiple - P/E | 14.9 bx_FairValueInputsPriceEarningsRatioExitMultiple / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember | [1] | 11.2 bx_FairValueInputsPriceEarningsRatioExitMultiple / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember | [1]
Investments Of Consolidated Blackstone Funds | Equity Securities | Discounted Cash Flows | Minimum |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Discount Rate | 8.40%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 8.40%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Revenue CAGR | 1.10%us-gaap_FairValueInputsLongTermRevenueGrowthRate / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 0.70%us-gaap_FairValueInputsLongTermRevenueGrowthRate / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Exit Multiple - EBITDA | 5.0 bx_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationExitMultiple / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 5.0 bx_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationExitMultiple / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Exit Multiple - P/E | 7.5 bx_FairValueInputsPriceEarningsRatioExitMultiple / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 10.5 bx_FairValueInputsPriceEarningsRatioExitMultiple / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Investments Of Consolidated Blackstone Funds | Equity Securities | Discounted Cash Flows | Maximum |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Discount Rate | 24.60%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 24.70%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Revenue CAGR | 102.60%us-gaap_FairValueInputsLongTermRevenueGrowthRate / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 24.40%us-gaap_FairValueInputsLongTermRevenueGrowthRate / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Exit Multiple - EBITDA | 17.0 bx_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationExitMultiple / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 13.0 bx_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationExitMultiple / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Exit Multiple - P/E | 17.0 bx_FairValueInputsPriceEarningsRatioExitMultiple / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 17.0 bx_FairValueInputsPriceEarningsRatioExitMultiple / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Investments Of Consolidated Blackstone Funds | Equity Securities | Market Comparable Companies | Level 3 |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair value assets | 1,617 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_MarketComparableCompaniesMember |  | 163 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_MarketComparableCompaniesMember |
Investments Of Consolidated Blackstone Funds | Equity Securities | Market Comparable Companies | Weighted Average |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
EBITDA Multiple | 6.9 us-gaap_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationMultiple / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_MarketComparableCompaniesMember | [1] | 6.9 us-gaap_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationMultiple / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_MarketComparableCompaniesMember | [1]
Investments Of Consolidated Blackstone Funds | Equity Securities | Market Comparable Companies | Minimum |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
EBITDA Multiple | 6.5 us-gaap_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationMultiple / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_MarketComparableCompaniesMember |  | 6.7 us-gaap_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationMultiple / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_MarketComparableCompaniesMember |
Investments Of Consolidated Blackstone Funds | Equity Securities | Market Comparable Companies | Maximum |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
EBITDA Multiple | 7.8 us-gaap_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationMultiple / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_MarketComparableCompaniesMember |  | 7.6 us-gaap_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationMultiple / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_MarketComparableCompaniesMember |
Investments Of Consolidated Blackstone Funds | Equity Securities | Transaction Price Valuation Technique | Level 3 |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair value assets | 64,167 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_TransactionPriceValuationTechniqueMember |  | 67,706 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_TransactionPriceValuationTechniqueMember |
Investments Of Consolidated Blackstone Funds | Equity Securities | Third Party Pricing Valuation Technique | Level 3 |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair value assets | 39 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_ThirdPartyPricingValuationTechniqueMember |  | 45 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_ThirdPartyPricingValuationTechniqueMember |
Investments Of Consolidated Blackstone Funds | Equity Securities | Other | Level 3 |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair value assets | 2,665 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_OtherValuationTechniqueMember |  | 4,670 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_ConsolidatedEquitySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_OtherValuationTechniqueMember |
Investments Of Consolidated Blackstone Funds | Partnership And LLC Interests | Discounted Cash Flows |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Exit Multiple - P/E | 0.5 bx_FairValueInputsPriceEarningsRatioExitMultiple / us-gaap_FairValueByAssetClassAxis = bx_PartnershipAndLlcInterestsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  |  |
Investments Of Consolidated Blackstone Funds | Partnership And LLC Interests | Discounted Cash Flows | Level 3 |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair value assets | 684,685 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_PartnershipAndLlcInterestsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 485,748 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_PartnershipAndLlcInterestsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Investments Of Consolidated Blackstone Funds | Partnership And LLC Interests | Discounted Cash Flows | Weighted Average |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Discount Rate | 8.90%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = bx_PartnershipAndLlcInterestsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember | [1] | 9.50%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = bx_PartnershipAndLlcInterestsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember | [1]
Revenue CAGR | 5.40%us-gaap_FairValueInputsLongTermRevenueGrowthRate / us-gaap_FairValueByAssetClassAxis = bx_PartnershipAndLlcInterestsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember | [1] | 6.50%us-gaap_FairValueInputsLongTermRevenueGrowthRate / us-gaap_FairValueByAssetClassAxis = bx_PartnershipAndLlcInterestsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember | [1]
Exit Multiple - EBITDA | 10.2 bx_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationExitMultiple / us-gaap_FairValueByAssetClassAxis = bx_PartnershipAndLlcInterestsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember | [1] | 9.7 bx_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationExitMultiple / us-gaap_FairValueByAssetClassAxis = bx_PartnershipAndLlcInterestsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember | [1]
Exit Capitalization Rate | 6.10%us-gaap_FairValueInputsCapRate / us-gaap_FairValueByAssetClassAxis = bx_PartnershipAndLlcInterestsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember | [1] | 6.80%us-gaap_FairValueInputsCapRate / us-gaap_FairValueByAssetClassAxis = bx_PartnershipAndLlcInterestsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember | [1]
Investments Of Consolidated Blackstone Funds | Partnership And LLC Interests | Discounted Cash Flows | Minimum |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Discount Rate | 4.40%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = bx_PartnershipAndLlcInterestsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 4.40%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = bx_PartnershipAndLlcInterestsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Revenue CAGR | (8.10%)us-gaap_FairValueInputsLongTermRevenueGrowthRate / us-gaap_FairValueByAssetClassAxis = bx_PartnershipAndLlcInterestsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | (4.40%)us-gaap_FairValueInputsLongTermRevenueGrowthRate / us-gaap_FairValueByAssetClassAxis = bx_PartnershipAndLlcInterestsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Exit Multiple - EBITDA | 3.0 bx_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationExitMultiple / us-gaap_FairValueByAssetClassAxis = bx_PartnershipAndLlcInterestsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 1.0 bx_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationExitMultiple / us-gaap_FairValueByAssetClassAxis = bx_PartnershipAndLlcInterestsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Exit Capitalization Rate | 2.00%us-gaap_FairValueInputsCapRate / us-gaap_FairValueByAssetClassAxis = bx_PartnershipAndLlcInterestsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 2.00%us-gaap_FairValueInputsCapRate / us-gaap_FairValueByAssetClassAxis = bx_PartnershipAndLlcInterestsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Investments Of Consolidated Blackstone Funds | Partnership And LLC Interests | Discounted Cash Flows | Maximum |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Discount Rate | 24.20%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = bx_PartnershipAndLlcInterestsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 21.50%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = bx_PartnershipAndLlcInterestsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Revenue CAGR | 63.50%us-gaap_FairValueInputsLongTermRevenueGrowthRate / us-gaap_FairValueByAssetClassAxis = bx_PartnershipAndLlcInterestsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 41.70%us-gaap_FairValueInputsLongTermRevenueGrowthRate / us-gaap_FairValueByAssetClassAxis = bx_PartnershipAndLlcInterestsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Exit Multiple - EBITDA | 23.0 bx_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationExitMultiple / us-gaap_FairValueByAssetClassAxis = bx_PartnershipAndLlcInterestsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 19.1 bx_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationExitMultiple / us-gaap_FairValueByAssetClassAxis = bx_PartnershipAndLlcInterestsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Exit Capitalization Rate | 14.20%us-gaap_FairValueInputsCapRate / us-gaap_FairValueByAssetClassAxis = bx_PartnershipAndLlcInterestsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 19.10%us-gaap_FairValueInputsCapRate / us-gaap_FairValueByAssetClassAxis = bx_PartnershipAndLlcInterestsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Investments Of Consolidated Blackstone Funds | Partnership And LLC Interests | Transaction Price Valuation Technique | Level 3 |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair value assets | 25,825 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_PartnershipAndLlcInterestsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_TransactionPriceValuationTechniqueMember |  | 996,199 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_PartnershipAndLlcInterestsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_TransactionPriceValuationTechniqueMember |
Investments Of Consolidated Blackstone Funds | Partnership And LLC Interests | Third Party Pricing Valuation Technique | Level 3 |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair value assets | 851,108 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_PartnershipAndLlcInterestsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_ThirdPartyPricingValuationTechniqueMember |  | 13,793 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_PartnershipAndLlcInterestsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_ThirdPartyPricingValuationTechniqueMember |
Investments Of Consolidated Blackstone Funds | Partnership And LLC Interests | Other | Level 3 |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair value assets | 723 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_PartnershipAndLlcInterestsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_OtherValuationTechniqueMember |  | 682 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_PartnershipAndLlcInterestsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_OtherValuationTechniqueMember |
Investments Of Consolidated Blackstone Funds | Debt Instruments | Discounted Cash Flows |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Default Rate |  |  | 2.00%us-gaap_FairValueInputsProbabilityOfDefault / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Recovery Lag |  |  | 12 months |
Pre-payment Rate |  |  | 20.00%us-gaap_FairValueInputsPrepaymentRate / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Investments Of Consolidated Blackstone Funds | Debt Instruments | Discounted Cash Flows | Level 3 |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair value assets | 8,622 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 9,570 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Investments Of Consolidated Blackstone Funds | Debt Instruments | Discounted Cash Flows | LIBOR |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Reinvestment Rate |  |  | 4.00%bx_FairValueInputsReinvestmentRate / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |
Investments Of Consolidated Blackstone Funds | Debt Instruments | Discounted Cash Flows | Weighted Average |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Discount Rate | 14.40%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember | [1] | 16.10%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember | [1]
Revenue CAGR | 16.50%us-gaap_FairValueInputsLongTermRevenueGrowthRate / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember | [1] | 5.00%us-gaap_FairValueInputsLongTermRevenueGrowthRate / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember | [1]
Exit Multiple - EBITDA | 8.6 bx_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationExitMultiple / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember | [1] | 11.0 bx_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationExitMultiple / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember | [1]
Exit Capitalization Rate | 5.90%us-gaap_FairValueInputsCapRate / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember | [1] | 9.30%us-gaap_FairValueInputsCapRate / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember | [1]
Recovery Rate |  |  | 66.00%bx_FairValueInputsRecoveryRate / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember | [1]
Investments Of Consolidated Blackstone Funds | Debt Instruments | Discounted Cash Flows | Minimum |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Discount Rate | 9.10%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 8.80%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Revenue CAGR | 5.60%us-gaap_FairValueInputsLongTermRevenueGrowthRate / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 4.70%us-gaap_FairValueInputsLongTermRevenueGrowthRate / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Exit Multiple - EBITDA | 5.8 bx_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationExitMultiple / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 5.9 bx_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationExitMultiple / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Exit Capitalization Rate | 1.00%us-gaap_FairValueInputsCapRate / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 1.00%us-gaap_FairValueInputsCapRate / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Recovery Rate |  |  | 30.00%bx_FairValueInputsRecoveryRate / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Investments Of Consolidated Blackstone Funds | Debt Instruments | Discounted Cash Flows | Maximum |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Discount Rate | 29.30%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 24.70%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Revenue CAGR | 20.00%us-gaap_FairValueInputsLongTermRevenueGrowthRate / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 6.80%us-gaap_FairValueInputsLongTermRevenueGrowthRate / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Exit Multiple - EBITDA | 9.5 bx_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationExitMultiple / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 11.3 bx_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationExitMultiple / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Exit Capitalization Rate | 6.60%us-gaap_FairValueInputsCapRate / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 12.40%us-gaap_FairValueInputsCapRate / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Recovery Rate |  |  | 70.00%bx_FairValueInputsRecoveryRate / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Investments Of Consolidated Blackstone Funds | Debt Instruments | Market Comparable Companies | Level 3 |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair value assets | 179 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_MarketComparableCompaniesMember |  | 172 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_MarketComparableCompaniesMember |
Investments Of Consolidated Blackstone Funds | Debt Instruments | Market Comparable Companies | Weighted Average |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
EBITDA Multiple | 6.0 us-gaap_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationMultiple / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_MarketComparableCompaniesMember | [1] | 6.6 us-gaap_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationMultiple / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_MarketComparableCompaniesMember | [1]
Investments Of Consolidated Blackstone Funds | Debt Instruments | Market Comparable Companies | Minimum |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
EBITDA Multiple | 5.9 us-gaap_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationMultiple / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_MarketComparableCompaniesMember |  | 6.6 us-gaap_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationMultiple / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_MarketComparableCompaniesMember |
Investments Of Consolidated Blackstone Funds | Debt Instruments | Market Comparable Companies | Maximum |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
EBITDA Multiple | 7.9 us-gaap_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationMultiple / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_MarketComparableCompaniesMember |  | 7.9 us-gaap_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationMultiple / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_MarketComparableCompaniesMember |
Investments Of Consolidated Blackstone Funds | Debt Instruments | Transaction Price Valuation Technique | Level 3 |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair value assets | 2,414 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_TransactionPriceValuationTechniqueMember |  | 686 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_TransactionPriceValuationTechniqueMember |
Investments Of Consolidated Blackstone Funds | Debt Instruments | Third Party Pricing Valuation Technique | Level 3 |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair value assets | 75,346 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_ThirdPartyPricingValuationTechniqueMember |  | 95,542 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_DebtInstrumentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_ThirdPartyPricingValuationTechniqueMember |
Investments Of Consolidated Blackstone Funds | Assets Of Consolidated CLO Vehicles | Discounted Cash Flows |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Discount Rate | 3.80%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = bx_AssetsOfConsolidatedCloVehiclesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 8.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = bx_AssetsOfConsolidatedCloVehiclesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Investments Of Consolidated Blackstone Funds | Assets Of Consolidated CLO Vehicles | Discounted Cash Flows | Level 3 |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair value assets | 1,926 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_AssetsOfConsolidatedCloVehiclesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |  | 3,826 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_AssetsOfConsolidatedCloVehiclesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_DiscountedCashFlowsMember |
Investments Of Consolidated Blackstone Funds | Assets Of Consolidated CLO Vehicles | Market Comparable Companies | Level 3 |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair value assets | 76,754 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_AssetsOfConsolidatedCloVehiclesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_MarketComparableCompaniesMember |  | 290,658 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_AssetsOfConsolidatedCloVehiclesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_MarketComparableCompaniesMember |
Investments Of Consolidated Blackstone Funds | Assets Of Consolidated CLO Vehicles | Market Comparable Companies | Weighted Average |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
EBITDA Multiple | 5.4 us-gaap_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationMultiple / us-gaap_FairValueByAssetClassAxis = bx_AssetsOfConsolidatedCloVehiclesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_MarketComparableCompaniesMember | [1] | 6.1 us-gaap_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationMultiple / us-gaap_FairValueByAssetClassAxis = bx_AssetsOfConsolidatedCloVehiclesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = bx_MarketComparableCompaniesMember | [1]
Investments Of Consolidated Blackstone Funds | Assets Of Consolidated CLO Vehicles | Market Comparable Companies | Minimum |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
EBITDA Multiple | 3.5 us-gaap_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationMultiple / us-gaap_FairValueByAssetClassAxis = bx_AssetsOfConsolidatedCloVehiclesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_MarketComparableCompaniesMember |  | 3.8 us-gaap_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationMultiple / us-gaap_FairValueByAssetClassAxis = bx_AssetsOfConsolidatedCloVehiclesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = bx_MarketComparableCompaniesMember |
Investments Of Consolidated Blackstone Funds | Assets Of Consolidated CLO Vehicles | Market Comparable Companies | Maximum |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
EBITDA Multiple | 7.5 us-gaap_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationMultiple / us-gaap_FairValueByAssetClassAxis = bx_AssetsOfConsolidatedCloVehiclesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_MarketComparableCompaniesMember |  | 15.0 us-gaap_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationMultiple / us-gaap_FairValueByAssetClassAxis = bx_AssetsOfConsolidatedCloVehiclesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = bx_MarketComparableCompaniesMember |
Investments Of Consolidated Blackstone Funds | Assets Of Consolidated CLO Vehicles | Third Party Pricing Valuation Technique | Level 3 |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair value assets | 491,928 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_AssetsOfConsolidatedCloVehiclesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_ThirdPartyPricingValuationTechniqueMember |  | 318,636 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_AssetsOfConsolidatedCloVehiclesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_ThirdPartyPricingValuationTechniqueMember |
Investments Of Consolidated Blackstone Funds | Investment Funds | Net Asset Value Valuation Technique | Level 3 |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Fair value assets | 1,170,378 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_InvestmentFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_NetAssetValueValuationTechniqueMember |  | 1,103,210 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = bx_InvestmentFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_ValuationTechniqueAxis = bx_NetAssetValueValuationTechniqueMember |
[1] | Unobservable inputs were weighted based on the fair value of the investments included in the range.

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