XML 46 R33.htm IDEA: XBRL DOCUMENT
v3.23.1

Agreements and Related Party Transactions - Sub-Administration and Expense Support (Details) - Sub-Administration Agreement | Oct. 01, 2018
--- | ---
Related Party Transaction [Line Items] |
Related party transaction, initial term | 2 years
Related party transaction, renewal term | 1 year
Termination notice period | 120 days

X
- Definition Related Party Transaction, Initial Term + References No definition available. + Details
Name: | bxsl_RelatedPartyTransactionInitialTerm
Namespace Prefix: | bxsl_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Related Party Transaction, Renewal Term + References No definition available. + Details
Name: | bxsl_RelatedPartyTransactionRenewalTerm
Namespace Prefix: | bxsl_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Related Party Transaction, Termination Notice Period + References No definition available. + Details
Name: | bxsl_RelatedPartyTransactionTerminationNoticePeriod
Namespace Prefix: | bxsl_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- 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_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=bxsl_SubAdministrationAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |