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Net Assets - Dividend Reinvestment (Details) | 12 Months Ended
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Dec. 31, 2023
Equity [Abstract] |
Purchase price of common stock, percent of market price | 95.00%

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- Definition Dividend Reinvestment Plan, Minimum Share Issuance Price, Percentage Of Current Market Price Per Share + References No definition available. + Details
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Namespace Prefix: | bxsl_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

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