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Fair Value Option - Additional Information (Detail) - Loans and Receivables - USD ($) | Dec. 31, 2022 | Dec. 31, 2021
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Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value of financial instruments more than one day past due | $ 0 | $ 0
Fair value of financial instruments with non-accrual status | $ 0 | $ 0

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- Definition Fair Value of Financial Instruments More Than One Day Past Due + References No definition available. + Details
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Namespace Prefix: | bx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Investment Securities Fair Value Disclosure On Nonaccrual Status + References No definition available. + Details
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Namespace Prefix: | bx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FairValueOptionQuantitativeDisclosuresLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=us-gaap_LoansReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |