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<xbrl
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  xmlns:dei="http://xbrl.sec.gov/dei/2025"
  xmlns:ffd="http://xbrl.sec.gov/ffd/2025"
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  xmlns:xlink="http://www.w3.org/1999/xlink">
    <link:schemaRef
      xlink:href="https://xbrl.sec.gov/ffd/2025/ffd-2025.xsd"
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        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001736035</identifier>
        </entity>
        <period>
            <startDate>2025-07-11</startDate>
            <endDate>2025-07-11</endDate>
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    <context id="offrl_1">
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            <endDate>2025-07-11</endDate>
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    <context id="offrl_2">
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            <endDate>2025-07-11</endDate>
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    <context id="offrl_3">
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            <identifier scheme="http://www.sec.gov/CIK">0001736035</identifier>
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                    <dei:lineNo>3</dei:lineNo>
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        <period>
            <startDate>2025-07-11</startDate>
            <endDate>2025-07-11</endDate>
        </period>
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    <context id="offrl_4">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001736035</identifier>
            <segment>
                <xbrldi:typedMember dimension="ffd:OfferingAxis">
                    <dei:lineNo>4</dei:lineNo>
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        <period>
            <startDate>2025-07-11</startDate>
            <endDate>2025-07-11</endDate>
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    <context id="offrl_5">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001736035</identifier>
            <segment>
                <xbrldi:typedMember dimension="ffd:OfferingAxis">
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        <period>
            <startDate>2025-07-11</startDate>
            <endDate>2025-07-11</endDate>
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            <identifier scheme="http://www.sec.gov/CIK">0001736035</identifier>
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        <period>
            <startDate>2025-07-11</startDate>
            <endDate>2025-07-11</endDate>
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    </context>
    <unit id="USD">
        <measure>iso4217:USD</measure>
    </unit>
    <unit id="pure">
        <measure>pure</measure>
    </unit>
    <unit id="Shares">
        <measure>shares</measure>
    </unit>
    <ffd:FormTp contextRef="rc" id="ixv-316">N-2</ffd:FormTp>
    <ffd:SubmissnTp contextRef="rc" id="ixv-317">N-2ASR</ffd:SubmissnTp>
    <ffd:FeeExhibitTp contextRef="rc" id="ixv-318">EX-FILING FEES</ffd:FeeExhibitTp>
    <dei:EntityCentralIndexKey contextRef="rc" id="ixv-319">0001736035</dei:EntityCentralIndexKey>
    <dei:EntityRegistrantName contextRef="rc" id="ixv-320">Blackstone Secured Lending Fund</dei:EntityRegistrantName>
    <ffd:FormTp contextRef="rc" id="ixv-390">N-2</ffd:FormTp>
    <dei:EntityRegistrantName contextRef="rc" id="ixv-391">Blackstone Secured Lending Fund</dei:EntityRegistrantName>
    <ffd:PrevslyPdFlg contextRef="offrl_1" id="ixv-392">false</ffd:PrevslyPdFlg>
    <ffd:OfferingSctyTp contextRef="offrl_1" id="ixv-393">Equity</ffd:OfferingSctyTp>
    <ffd:OfferingSctyTitl contextRef="offrl_1" id="ixv-394">Common Shares, $0.001 par value per share</ffd:OfferingSctyTitl>
    <ffd:FeesOthrRuleFlg contextRef="offrl_1" id="ixv-395">true</ffd:FeesOthrRuleFlg>
    <ffd:FeeRate
      contextRef="offrl_1"
      decimals="INF"
      id="ixv-396"
      unitRef="pure">0.0001531</ffd:FeeRate>
    <ffd:FeeAmt
      contextRef="offrl_1"
      decimals="INF"
      id="ixv-397"
      unitRef="USD">0.00</ffd:FeeAmt>
    <ffd:PrevslyPdFlg contextRef="offrl_2" id="ixv-398">false</ffd:PrevslyPdFlg>
    <ffd:OfferingSctyTp contextRef="offrl_2" id="ixv-399">Equity</ffd:OfferingSctyTp>
    <ffd:OfferingSctyTitl contextRef="offrl_2" id="ixv-400">Preferred Shares, $0.001 par value per share</ffd:OfferingSctyTitl>
    <ffd:FeesOthrRuleFlg contextRef="offrl_2" id="ixv-401">true</ffd:FeesOthrRuleFlg>
    <ffd:FeeRate
      contextRef="offrl_2"
      decimals="INF"
      id="ixv-402"
      unitRef="pure">0.0001531</ffd:FeeRate>
    <ffd:FeeAmt
      contextRef="offrl_2"
      decimals="INF"
      id="ixv-403"
      unitRef="USD">0.00</ffd:FeeAmt>
    <ffd:PrevslyPdFlg contextRef="offrl_3" id="ixv-404">false</ffd:PrevslyPdFlg>
    <ffd:OfferingSctyTp contextRef="offrl_3" id="ixv-405">Equity</ffd:OfferingSctyTp>
    <ffd:OfferingSctyTitl contextRef="offrl_3" id="ixv-406">Warrants</ffd:OfferingSctyTitl>
    <ffd:FeesOthrRuleFlg contextRef="offrl_3" id="ixv-407">true</ffd:FeesOthrRuleFlg>
    <ffd:FeeRate
      contextRef="offrl_3"
      decimals="INF"
      id="ixv-408"
      unitRef="pure">0.0001531</ffd:FeeRate>
    <ffd:FeeAmt
      contextRef="offrl_3"
      decimals="INF"
      id="ixv-409"
      unitRef="USD">0.00</ffd:FeeAmt>
    <ffd:PrevslyPdFlg contextRef="offrl_4" id="ixv-410">false</ffd:PrevslyPdFlg>
    <ffd:OfferingSctyTp contextRef="offrl_4" id="ixv-411">Other</ffd:OfferingSctyTp>
    <ffd:OfferingSctyTitl contextRef="offrl_4" id="ixv-412">Subscription Rights</ffd:OfferingSctyTitl>
    <ffd:FeesOthrRuleFlg contextRef="offrl_4" id="ixv-413">true</ffd:FeesOthrRuleFlg>
    <ffd:FeeRate
      contextRef="offrl_4"
      decimals="INF"
      id="ixv-414"
      unitRef="pure">0.0001531</ffd:FeeRate>
    <ffd:FeeAmt
      contextRef="offrl_4"
      decimals="INF"
      id="ixv-415"
      unitRef="USD">0.00</ffd:FeeAmt>
    <ffd:PrevslyPdFlg contextRef="offrl_5" id="ixv-416">false</ffd:PrevslyPdFlg>
    <ffd:OfferingSctyTp contextRef="offrl_5" id="ixv-417">Debt</ffd:OfferingSctyTp>
    <ffd:OfferingSctyTitl contextRef="offrl_5" id="ixv-418">Debt Securities</ffd:OfferingSctyTitl>
    <ffd:FeesOthrRuleFlg contextRef="offrl_5" id="ixv-419">true</ffd:FeesOthrRuleFlg>
    <ffd:FeeRate
      contextRef="offrl_5"
      decimals="INF"
      id="ixv-420"
      unitRef="pure">0.0001531</ffd:FeeRate>
    <ffd:FeeAmt
      contextRef="offrl_5"
      decimals="INF"
      id="ixv-421"
      unitRef="USD">0.00</ffd:FeeAmt>
    <ffd:OfferingSctyTp contextRef="offrl_6" id="ixv-422">Equity</ffd:OfferingSctyTp>
    <ffd:OfferingSctyTitl contextRef="offrl_6" id="ixv-423">Common Shares, $0.001 par value per share</ffd:OfferingSctyTitl>
    <ffd:Rule415a6Flg contextRef="offrl_6" id="ixv-424">true</ffd:Rule415a6Flg>
    <ffd:MaxAggtOfferingPric
      contextRef="offrl_6"
      decimals="INF"
      id="ixv-425"
      unitRef="USD">439457109.12</ffd:MaxAggtOfferingPric>
    <ffd:CfwdFormTp contextRef="offrl_6" id="ixv-426">N-2</ffd:CfwdFormTp>
    <ffd:CfwdPrrFileNb contextRef="offrl_6" id="ixv-427">333-266323</ffd:CfwdPrrFileNb>
    <ffd:CfwdPrrFctvDt contextRef="offrl_6" id="ixv-428">2022-07-26</ffd:CfwdPrrFctvDt>
    <ffd:CfwdPrevslyPdFee
      contextRef="offrl_6"
      decimals="INF"
      id="ixv-429"
      unitRef="USD">67280.88</ffd:CfwdPrevslyPdFee>
    <ffd:TtlOfferingAmt contextRef="rc" decimals="INF" id="ixv-430" unitRef="USD">439457109.12</ffd:TtlOfferingAmt>
    <ffd:TtlFeeAmt contextRef="rc" decimals="INF" id="ixv-431" unitRef="USD">0.00</ffd:TtlFeeAmt>
    <ffd:TtlPrevslyPdAmt contextRef="rc" decimals="INF" id="ixv-432" unitRef="USD">0.00</ffd:TtlPrevslyPdAmt>
    <ffd:TtlOffsetAmt contextRef="rc" decimals="INF" id="ixv-433" unitRef="USD">0.00</ffd:TtlOffsetAmt>
    <ffd:NetFeeAmt contextRef="rc" decimals="INF" id="ixv-434" unitRef="USD">0.00</ffd:NetFeeAmt>
    <ffd:OfferingNote contextRef="offrl_1" id="ixv-435">An indeterminate aggregate initial offering price or number of securities of each identified class is being registered as may from time to time be offered hereunder by Blackstone Secured Lending Fund (the "registrant") at indeterminate prices, and includes such indeterminate number of such securities as may, from time to time, be issued upon conversion, redemption, repurchase, exchange or exercise of other securities registered hereunder, to the extent any such other securities are, by their terms, convertible or exchangeable for such securities, including under any applicable anti-dilution provisions; warrants include an indeterminate number of warrants as may be sold, from time to time separately or in combination with other securities registered hereunder, representing rights to purchase common shares of beneficial interest, par value $0.001 per share (the "common shares"), preferred shares or debt securities.  

In accordance with Rule 456(b) and Rule 457(r) under the Securities Act of 1933, as amended (the "Securities Act"), the registrant is deferring payment of all of the registration fees and will pay any registration fees subsequently in advance or on a pay-as-you-go basis. </ffd:OfferingNote>
    <ffd:OfferingNote contextRef="offrl_2" id="ixv-436">See Footnote 1. </ffd:OfferingNote>
    <ffd:OfferingNote contextRef="offrl_3" id="ixv-437">See Footnote 1. </ffd:OfferingNote>
    <ffd:OfferingNote contextRef="offrl_4" id="ixv-438">See Footnote 1.</ffd:OfferingNote>
    <ffd:OfferingNote contextRef="offrl_5" id="ixv-439">See Footnote 1 and below.

Debt securities may be issued at an original issue discount. </ffd:OfferingNote>
    <ffd:OfferingNote contextRef="offrl_6" id="ixv-440">Pursuant to Rule 415(a)(6) under the Securities Act, the securities registered pursuant to this registration statement include $439,457,109.12 of unsold common shares (the "Unsold Securities") previously registered pursuant to the Registration Statement on Form N-2ASR (File No. 333-266323) (the "Prior Registration Statement"), and the prospectus supplement filed on January 21, 2025 (the "Prospectus Supplement"). Pursuant to the Prospectus Supplement, $600,000,000 of the registrant's common shares could be issued and sold pursuant to certain equity distribution agreements. The registrant sold $160,542,890.88 of such securities under the Prior Registration Statement, leaving the balance of $439,457,109.12 of Unsold Securities, in respect of which the registrant paid a filing fee of $67,280.88 (based on the filing fee rate in effect at the time of the filing of the Prospectus Supplement) in connection with the filing of the Prospectus Supplement. Pursuant to Rule 415(a)(6), the filing fee of $67,280.88 associated with the offering of the Unsold Securities is hereby carried forward to be applied to $439,457,109.12 of Unsold Securities registered hereunder, and as a result, no additional filing fee is due with respect to the Unsold Securities included in this registration statement. Pursuant to Rule 415(a)(6), the offering of securities under the Prior Registration Statement will be deemed terminated as of the time of filing of this registration statement.</ffd:OfferingNote>
</xbrl>
