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

X

- 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

X

- References

No definition available.

+ Details

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