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      xml:lang="en-US">&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#161616;;"&gt;This &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#161616;;"&gt;annual shareholder report&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#161616;;"&gt; contains important information about &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#161616;;"&gt;Western Asset Institutional U.S. Treasury Reserves for the period &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#161616;;"&gt;September 1, 2025, to &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#161616;;"&gt;August 31, 2026.&lt;/span&gt;</oef:AnnlOrSemiAnnlStatementTextBlock>
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      xml:lang="en-US">&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#161616;;"&gt;You can find additional information about the Fund at &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;;"&gt;https://www.franklintempleton.com/regulatory-fund-documents&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#161616;;"&gt;. You can also &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#161616;;"&gt;request this information by contacting us at &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#161616;;"&gt;1-800-625-4554, or 1-203-703-6002&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#161616;;"&gt;.&lt;/span&gt;</oef:AddlInfoTextBlock>
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      xml:lang="en-US">&lt;div&gt;&lt;span style="text-transform:uppercase;"&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:12.024pt;text-transform:uppercase;color:#1447FF;;"&gt;&lt;b&gt;WHAT WERE THE FUND COSTS FOR THE LAST YEAR? &lt;/b&gt;&lt;/span&gt;&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.824pt;color:#2D2D2D;;"&gt;(based on a hypothetical $10,000 investment)&lt;/span&gt;&lt;/div&gt;&lt;div&gt;
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            &lt;td style="height:1px;width:22.33812949640288%;background-color:#E6FAFF;"&gt;&lt;/td&gt;
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               &lt;div style="background-color:#E6FAFF;padding-left:2pt;padding-top:1.5pt;padding-bottom:0;align:center;text-align:center;padding-right:2pt;font-family:Arial, Helvetica, sans-serif;font-size:10pt;margin-top:1pt;margin-bottom:0;"&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;;"&gt;&lt;b&gt;Costs of a $10,000 &lt;/b&gt;&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;;"&gt;&lt;b&gt;investment&lt;/b&gt;&lt;/span&gt;&lt;/div&gt;
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      xml:lang="en-US">&lt;div&gt;&lt;span style="text-transform:uppercase;"&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:12.024pt;text-transform:uppercase;color:#1447FF;;"&gt;&lt;b&gt;HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE?&lt;/b&gt;&lt;/span&gt;&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;As of August 31, 2026, the seven-day current yield for &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;Institutional Shares of the Western Asset Institutional U.S. Treasury Reserves was &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;3.61% and the seven-day effective yield was &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;3.67%. The seven-day current yield represents net interest income generated by the &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;Fund&#x2019;s investments for the past seven days and assumes income is generated each week over a 365-day period. The seven-day &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;effective yield assumes reinvestment of the coupon (interest payments) and will typically be slightly higher than the current yield &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;because of the compounding effect on investment returns.&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;The Fund maintained a neutral/long maturity stance during the latter part of the reporting period to benefit from a steeper yield curve. &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;The positioning was a positive contributor to performance.&lt;/span&gt;&lt;/div&gt;</oef:FactorsAffectingPerfTextBlock>
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      xml:lang="en-US">&lt;div&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;For current month-end performance, please call Franklin Templeton at &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;1-800-625-4554, or 1-203-703-6002 or visit&lt;/span&gt;&lt;br/&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;;"&gt;https://www.franklintempleton.com/investments/options/money-market-funds&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;. &lt;/span&gt;&lt;/div&gt;</oef:UpdPerfInfoLocationTextBlock>
    <oef:AddlFundStatisticsTextBlock
      contextRef="c_8365_duration_WesternAssetInstitutionalUSTreasuryReserves_ClassInstitutionalShares_2025-09-01_2026-08-31Member"
      id="ixv-233"
      xml:lang="en-US">&lt;div&gt;&lt;span style="text-transform:uppercase;"&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:12.024pt;text-transform:uppercase;color:#1447FF;;"&gt;&lt;b&gt;KEY FUND STATISTICS &lt;/b&gt;&lt;/span&gt;&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.824pt;color:#2D2D2D;;"&gt;(as of &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.824pt;color:#2D2D2D;;"&gt;August 31, 2026)&lt;/span&gt;&lt;/div&gt;&lt;div&gt;
      &lt;table cellspacing="0" style="width:98%;cellspacing:0;border-top:1.5pt solid #6B6B6B;margin-left:7.75pt;border-bottom:1.5pt solid #6B6B6B;margin-top:10px;"&gt;
         &lt;tr style="height:1px;"&gt;
            &lt;td style="height:1px;width:90%;"&gt;&lt;/td&gt;
            &lt;td style="height:1px;width:10%;"&gt;&lt;/td&gt;
         &lt;/tr&gt;
         &lt;tr&gt;
            &lt;td colspan="1" style="border-bottom:0.75pt solid #6B6B6B;vertical-align:top"&gt;
               &lt;div style="background-color:#FFFFFF;padding-left:2pt;padding-top:1pt;padding-bottom:0;align:left;text-align:left;padding-right:2pt;font-family:Arial, Helvetica, sans-serif;font-size:10pt;margin-top:1pt;margin-bottom:0;"&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;&lt;b&gt;Total Net Assets&lt;/b&gt;&lt;/span&gt;&lt;/div&gt;
            &lt;/td&gt;
            &lt;td colspan="1" style="border-bottom:0.75pt solid #6B6B6B;vertical-align:bottom"&gt;
               &lt;div style="background-color:#FFFFFF;padding-left:2pt;padding-top:1pt;padding-bottom:0;align:right;text-align:right;padding-right:2pt;font-family:Arial, Helvetica, sans-serif;font-size:10pt;margin-top:1pt;margin-bottom:0;"&gt;&lt;span style="font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;"&gt;$7,689,378,026&lt;/span&gt;&lt;/div&gt;
            &lt;/td&gt;
         &lt;/tr&gt;
         &lt;tr&gt;
            &lt;td colspan="1" style="border-bottom:0.75pt solid #6B6B6B;vertical-align:top"&gt;
               &lt;div style="background-color:#FFFFFF;padding-left:2pt;padding-top:1pt;padding-bottom:0;align:left;text-align:left;padding-right:2pt;font-family:Arial, Helvetica, sans-serif;font-size:10pt;margin-top:1pt;margin-bottom:0;"&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;&lt;b&gt;Total Number of Portfolio Holdings (reflects holdings of &lt;/b&gt;&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;&lt;b&gt;U.S. Treasury Reserves Portfolio)&lt;/b&gt;&lt;/span&gt;&lt;/div&gt;
            &lt;/td&gt;
            &lt;td colspan="1" style="border-bottom:0.75pt solid #6B6B6B;vertical-align:bottom"&gt;
               &lt;div style="background-color:#FFFFFF;padding-left:2pt;padding-top:1pt;padding-bottom:0;align:right;text-align:right;padding-right:2pt;font-family:Arial, Helvetica, sans-serif;font-size:10pt;margin-top:1pt;margin-bottom:0;"&gt;&lt;span style="font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;"&gt;62&lt;/span&gt;&lt;/div&gt;
            &lt;/td&gt;
         &lt;/tr&gt;
         &lt;tr&gt;
            &lt;td colspan="1" style="vertical-align:top"&gt;
               &lt;div style="background-color:#FFFFFF;padding-left:2pt;padding-top:1pt;padding-bottom:0;align:left;text-align:left;padding-right:2pt;font-family:Arial, Helvetica, sans-serif;font-size:10pt;margin-top:1pt;margin-bottom:0;"&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;&lt;b&gt;Total Management Fee Paid&lt;/b&gt;&lt;/span&gt;&lt;/div&gt;
            &lt;/td&gt;
            &lt;td colspan="1" style="vertical-align:bottom"&gt;
               &lt;div style="background-color:#FFFFFF;padding-left:2pt;padding-top:1pt;padding-bottom:0;align:right;text-align:right;padding-right:2pt;font-family:Arial, Helvetica, sans-serif;font-size:10pt;margin-top:1pt;margin-bottom:0;"&gt;&lt;span style="font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;"&gt;$12,062,390&lt;/span&gt;&lt;/div&gt;
            &lt;/td&gt;
         &lt;/tr&gt;
      &lt;/table&gt;&lt;/div&gt;</oef:AddlFundStatisticsTextBlock>
    <us-gaap:AssetsNet
      contextRef="c_8365_instant_WesternAssetInstitutionalUSTreasuryReserves_ClassInstitutionalShares_2026-08-31Member"
      decimals="INF"
      id="ixv-9684"
      unitRef="USD">7689378026</us-gaap:AssetsNet>
    <oef:HoldingsCount
      contextRef="c_8365_instant_WesternAssetInstitutionalUSTreasuryReserves_ClassInstitutionalShares_2026-08-31Member"
      decimals="INF"
      id="ixv-9685"
      unitRef="UNIT">62</oef:HoldingsCount>
    <oef:AdvisoryFeesPaidAmt
      contextRef="c_8365_duration_WesternAssetInstitutionalUSTreasuryReserves_ClassInstitutionalShares_2025-09-01_2026-08-31Member"
      decimals="INF"
      id="ixv-9686"
      unitRef="USD">12062390</oef:AdvisoryFeesPaidAmt>
    <oef:HoldingsTableTextBlock
      contextRef="c_8365_duration_WesternAssetInstitutionalUSTreasuryReserves_ClassInstitutionalShares_2025-09-01_2026-08-31Member"
      id="foot-8365_902591-1011"
      xml:lang="en-US">&lt;div&gt;&lt;span style="text-transform:uppercase;"&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:12.024pt;text-transform:uppercase;color:#1447FF;;"&gt;&lt;b&gt;WHAT DID THE FUND INVEST IN? &lt;/b&gt;&lt;/span&gt;&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.824pt;color:#2D2D2D;;"&gt;(as of &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.824pt;color:#2D2D2D;;"&gt;August 31, 2026)&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:12.024pt;color:#161616;;"&gt;&lt;b&gt;Portfolio Composition&lt;/b&gt;&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:12.024pt;color:#161616;;"&gt;&lt;sup&gt;*&lt;/sup&gt;&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:12.024pt;color:#161616;;"&gt;&lt;b&gt; &lt;/b&gt;&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:12.024pt;color:#161616;;"&gt;&lt;b&gt;(% of Total Investments)&lt;/b&gt;&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;img alt="image" src="ts8365img004.jpg" style="width:96.41294838145232%"/&gt;&lt;/div&gt;</oef:HoldingsTableTextBlock>
    <oef:UpdProspectusWebAddress
      contextRef="c_8365_duration_WesternAssetInstitutionalUSTreasuryReserves_ClassInstitutionalShares_2025-09-01_2026-08-31Member"
      id="ixv-342"
      xml:lang="en-US">https://www.franklintempleton.com/regulatory-fund-documents</oef:UpdProspectusWebAddress>
    <oef:PctOfTotalInv
      contextRef="c_8365_instant_WesternAssetInstitutionalUSTreasuryReserves_ClassInstitutionalShares_2026-08-31_4121Member"
      decimals="INF"
      id="ixv-9687"
      unitRef="RATIO">0.741</oef:PctOfTotalInv>
    <oef:PctOfTotalInv
      contextRef="c_8365_instant_WesternAssetInstitutionalUSTreasuryReserves_ClassInstitutionalShares_2026-08-31_4124Member"
      decimals="INF"
      id="ixv-9688"
      unitRef="RATIO">0.259</oef:PctOfTotalInv>
    <oef:FundName
      contextRef="c_8366_duration_WesternAssetInstitutionalUSTreasuryReserves_ClassInvestorShares_2025-09-01_2026-08-31Member"
      id="ixv-394"
      xml:lang="en-US">Western Asset Institutional U.S. Treasury Reserves</oef:FundName>
    <oef:ClassName
      contextRef="c_8366_duration_WesternAssetInstitutionalUSTreasuryReserves_ClassInvestorShares_2025-09-01_2026-08-31Member"
      id="ixv-400"
      xml:lang="en-US">Investor Shares</oef:ClassName>
    <dei:TradingSymbol
      contextRef="c_8366_duration_WesternAssetInstitutionalUSTreasuryReserves_ClassInvestorShares_2025-09-01_2026-08-31Member"
      id="ixv-403"
      xml:lang="en-US">LTRXX</dei:TradingSymbol>
    <dei:DocumentPeriodEndDate
      contextRef="c_8365_duration_WesternAssetInstitutionalUSTreasuryReserves_2025-09-01_2026-08-31Member"
      id="ixv-409"
      xml:lang="en-US">2026-08-31</dei:DocumentPeriodEndDate>
    <oef:AnnlOrSemiAnnlStatementTextBlock
      contextRef="c_8366_duration_WesternAssetInstitutionalUSTreasuryReserves_ClassInvestorShares_2025-09-01_2026-08-31Member"
      id="ixv-418"
      xml:lang="en-US">&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#161616;;"&gt;This &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#161616;;"&gt;annual shareholder report&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#161616;;"&gt; contains important information about &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#161616;;"&gt;Western Asset Institutional U.S. Treasury Reserves for the period &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#161616;;"&gt;September 1, 2025, to &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#161616;;"&gt;August 31, 2026.&lt;/span&gt;</oef:AnnlOrSemiAnnlStatementTextBlock>
    <oef:ShareholderReportAnnualOrSemiAnnual
      contextRef="c_8365_duration_WesternAssetInstitutionalUSTreasuryReserves_2025-09-01_2026-08-31Member"
      id="ixv-420"
      xml:lang="en-US">annual shareholder report</oef:ShareholderReportAnnualOrSemiAnnual>
    <oef:AddlInfoTextBlock
      contextRef="c_8366_duration_WesternAssetInstitutionalUSTreasuryReserves_ClassInvestorShares_2025-09-01_2026-08-31Member"
      id="ixv-427"
      xml:lang="en-US">&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#161616;;"&gt;You can find additional information about the Fund at &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;;"&gt;https://www.franklintempleton.com/regulatory-fund-documents&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#161616;;"&gt;. You can also &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#161616;;"&gt;request this information by contacting us at &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#161616;;"&gt;1-800-625-4554, or 1-203-703-6002&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#161616;;"&gt;.&lt;/span&gt;</oef:AddlInfoTextBlock>
    <oef:AddlInfoWebsite
      contextRef="c_8366_duration_WesternAssetInstitutionalUSTreasuryReserves_ClassInvestorShares_2025-09-01_2026-08-31Member"
      id="ixv-429"
      xml:lang="en-US">https://www.franklintempleton.com/regulatory-fund-documents</oef:AddlInfoWebsite>
    <oef:AddlInfoPhoneNumber
      contextRef="c_8366_duration_WesternAssetInstitutionalUSTreasuryReserves_ClassInvestorShares_2025-09-01_2026-08-31Member"
      id="ixv-433"
      xml:lang="en-US">1-800-625-4554, or 1-203-703-6002</oef:AddlInfoPhoneNumber>
    <oef:ExpensesTextBlock
      contextRef="c_8366_duration_WesternAssetInstitutionalUSTreasuryReserves_ClassInvestorShares_2025-09-01_2026-08-31Member"
      id="foot-8366_902691-1011"
      xml:lang="en-US">&lt;div&gt;&lt;span style="text-transform:uppercase;"&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:12.024pt;text-transform:uppercase;color:#1447FF;;"&gt;&lt;b&gt;WHAT WERE THE FUND COSTS FOR THE LAST YEAR? &lt;/b&gt;&lt;/span&gt;&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.824pt;color:#2D2D2D;;"&gt;(based on a hypothetical $10,000 investment)&lt;/span&gt;&lt;/div&gt;&lt;div&gt;
      &lt;table cellspacing="0" style="width:98%;cellspacing:0;border-top:1.5pt solid #E6FAFF;border-left:1.5pt solid #E6FAFF;  border-right:1.5pt solid #E6FAFF;  border-bottom:1.5pt solid #E6FAFF; margin-left:7.9pt;"&gt;
         &lt;tr style="height:1px;"&gt;
            &lt;td style="height:1px;width:50%;background-color:#E6FAFF;"&gt;&lt;/td&gt;
            &lt;td style="height:1px;width:22.33812949640288%;background-color:#E6FAFF;"&gt;&lt;/td&gt;
            &lt;td style="height:1px;width:27.661870503597125%;background-color:#E6FAFF;"&gt;&lt;/td&gt;
         &lt;/tr&gt;
         &lt;tr&gt;
            &lt;td colspan="1" style="background-color:#E6FAFF;;border-bottom:1.5pt solid #1447FF;vertical-align:bottom"&gt;
               &lt;div style="background-color:#E6FAFF;padding-left:2pt;padding-top:1.5pt;padding-bottom:0;align:left;text-align:left;padding-right:2pt;font-family:Arial, Helvetica, sans-serif;font-size:10pt;margin-top:1pt;margin-bottom:0;"&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;;"&gt;&lt;b&gt;Class Name&lt;/b&gt;&lt;/span&gt;&lt;/div&gt;
            &lt;/td&gt;
            &lt;td colspan="1" style="background-color:#E6FAFF;;border-bottom:1.5pt solid #1447FF;vertical-align:bottom"&gt;
               &lt;div style="background-color:#E6FAFF;padding-left:2pt;padding-top:1.5pt;padding-bottom:0;align:center;text-align:center;padding-right:2pt;font-family:Arial, Helvetica, sans-serif;font-size:10pt;margin-top:1pt;margin-bottom:0;"&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;;"&gt;&lt;b&gt;Costs of a $10,000 &lt;/b&gt;&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;;"&gt;&lt;b&gt;investment&lt;/b&gt;&lt;/span&gt;&lt;/div&gt;
            &lt;/td&gt;
            &lt;td colspan="1" style="background-color:#E6FAFF;;border-bottom:1.5pt solid #1447FF;vertical-align:bottom"&gt;
               &lt;div style="background-color:#E6FAFF;padding-left:2pt;padding-top:1.5pt;padding-bottom:0;align:center;text-align:center;padding-right:2pt;font-family:Arial, Helvetica, sans-serif;font-size:10pt;margin-top:1pt;margin-bottom:0;"&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;;"&gt;&lt;b&gt;Costs paid as a percentage of a &lt;/b&gt;&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;;"&gt;&lt;b&gt;$10,000 investment&lt;/b&gt;&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;;"&gt;&lt;sup&gt;*&lt;/sup&gt;&lt;/span&gt;
               &lt;/div&gt;
            &lt;/td&gt;
         &lt;/tr&gt;
         &lt;tr&gt;
            &lt;td colspan="1" style="background-color:#E6FAFF;;vertical-align:bottom"&gt;
               &lt;div style="background-color:#E6FAFF;padding-left:2pt;padding-top:1.5pt;padding-bottom:0;align:left;text-align:left;padding-right:2pt;font-family:Arial, Helvetica, sans-serif;font-size:10pt;margin-top:1pt;margin-bottom:0;"&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;;"&gt;Investor Shares&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:7.5pt;;"&gt;&lt;sup&gt;1&lt;/sup&gt;&lt;/span&gt;
               &lt;/div&gt;
            &lt;/td&gt;
            &lt;td colspan="1" style="background-color:#E6FAFF;;vertical-align:bottom"&gt;
               &lt;div style="background-color:#E6FAFF;padding-left:2pt;padding-top:1.5pt;padding-bottom:0;align:center;text-align:center;padding-right:2pt;font-family:Arial, Helvetica, sans-serif;font-size:10pt;margin-top:1pt;margin-bottom:0;"&gt;&lt;span style="font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;"&gt;$23&lt;/span&gt;&lt;/div&gt;
            &lt;/td&gt;
            &lt;td colspan="1" style="background-color:#E6FAFF;;white-space:nowrap;vertical-align:bottom"&gt;
               &lt;div style="background-color:#E6FAFF;padding-left:2pt;padding-top:1.5pt;padding-bottom:0;align:center;text-align:center;padding-right:2pt;font-family:Arial, Helvetica, sans-serif;font-size:10pt;margin-top:1pt;margin-bottom:0;"&gt;&lt;span style="font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;"&gt;0.23%&lt;/span&gt;&lt;/div&gt;
            &lt;/td&gt;
         &lt;/tr&gt;
      &lt;/table&gt;&lt;/div&gt;</oef:ExpensesTextBlock>
    <oef:ExpensesPaidAmt
      contextRef="c_8366_duration_WesternAssetInstitutionalUSTreasuryReserves_ClassInvestorShares_2025-09-01_2026-08-31Member"
      decimals="INF"
      id="foot-8366_902691-1021"
      unitRef="USD">23</oef:ExpensesPaidAmt>
    <oef:ExpenseRatioPct
      contextRef="c_8366_duration_WesternAssetInstitutionalUSTreasuryReserves_ClassInvestorShares_2025-09-01_2026-08-31Member"
      decimals="INF"
      id="foot-8366_902691-1031"
      unitRef="RATIO">0.0023</oef:ExpenseRatioPct>
    <oef:FactorsAffectingPerfTextBlock
      contextRef="c_8366_duration_WesternAssetInstitutionalUSTreasuryReserves_ClassInvestorShares_2025-09-01_2026-08-31Member"
      id="ixv-505"
      xml:lang="en-US">&lt;div&gt;&lt;span style="text-transform:uppercase;"&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:12.024pt;text-transform:uppercase;color:#1447FF;;"&gt;&lt;b&gt;HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE?&lt;/b&gt;&lt;/span&gt;&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;As of August 31, 2026, the seven-day current yield for &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;Investor Shares of the Western Asset Institutional U.S. Treasury Reserves was &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;3.56% and the seven-day effective yield was &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;3.62%. The seven-day current yield represents net interest income generated by the &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;Fund&#x2019;s investments for the past seven days and assumes income is generated each week over a 365-day period. The seven-day &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;effective yield assumes reinvestment of the coupon (interest payments) and will typically be slightly higher than the current yield &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;because of the compounding effect on investment returns.&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;The Fund maintained a neutral/long maturity stance during the latter part of the reporting period to benefit from a steeper yield curve. &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;The positioning was a positive contributor to performance.&lt;/span&gt;&lt;/div&gt;</oef:FactorsAffectingPerfTextBlock>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="c_8366_duration_WesternAssetInstitutionalUSTreasuryReserves_ClassInvestorShares_2025-09-01_2026-08-31Member"
      id="ixv-526"
      xml:lang="en-US">The Fund&#x2019;s past performance is not necessarily an indication of how the Fund will perform in the future.</oef:PerformancePastDoesNotIndicateFuture>
    <oef:UpdPerfInfoLocationTextBlock
      contextRef="c_8366_duration_WesternAssetInstitutionalUSTreasuryReserves_ClassInvestorShares_2025-09-01_2026-08-31Member"
      id="ixv-530"
      xml:lang="en-US">&lt;div&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;For current month-end performance, please call Franklin Templeton at &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;1-800-625-4554, or 1-203-703-6002 or visit&lt;/span&gt;&lt;br/&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;;"&gt;https://www.franklintempleton.com/investments/options/money-market-funds&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;. &lt;/span&gt;&lt;/div&gt;</oef:UpdPerfInfoLocationTextBlock>
    <oef:AddlFundStatisticsTextBlock
      contextRef="c_8366_duration_WesternAssetInstitutionalUSTreasuryReserves_ClassInvestorShares_2025-09-01_2026-08-31Member"
      id="ixv-540"
      xml:lang="en-US">&lt;div&gt;&lt;span style="text-transform:uppercase;"&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:12.024pt;text-transform:uppercase;color:#1447FF;;"&gt;&lt;b&gt;KEY FUND STATISTICS &lt;/b&gt;&lt;/span&gt;&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.824pt;color:#2D2D2D;;"&gt;(as of &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.824pt;color:#2D2D2D;;"&gt;August 31, 2026)&lt;/span&gt;&lt;/div&gt;&lt;div&gt;
      &lt;table cellspacing="0" style="width:98%;cellspacing:0;border-top:1.5pt solid #6B6B6B;margin-left:7.75pt;border-bottom:1.5pt solid #6B6B6B;margin-top:10px;"&gt;
         &lt;tr style="height:1px;"&gt;
            &lt;td style="height:1px;width:74.41007194244604%;"&gt;&lt;/td&gt;
            &lt;td style="height:1px;width:25.58992805755396%;"&gt;&lt;/td&gt;
         &lt;/tr&gt;
         &lt;tr&gt;
            &lt;td colspan="1" style="border-bottom:0.75pt solid #6B6B6B;vertical-align:top"&gt;
               &lt;div style="background-color:#FFFFFF;padding-left:2pt;padding-top:1pt;padding-bottom:0;align:left;text-align:left;padding-right:2pt;font-family:Arial, Helvetica, sans-serif;font-size:10pt;margin-top:1pt;margin-bottom:0;"&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;&lt;b&gt;Total Net Assets&lt;/b&gt;&lt;/span&gt;&lt;/div&gt;
            &lt;/td&gt;
            &lt;td colspan="1" style="border-bottom:0.75pt solid #6B6B6B;vertical-align:bottom"&gt;
               &lt;div style="background-color:#FFFFFF;padding-left:2pt;padding-top:1pt;padding-bottom:0;align:right;text-align:right;padding-right:2pt;font-family:Arial, Helvetica, sans-serif;font-size:10pt;margin-top:1pt;margin-bottom:0;"&gt;&lt;span style="font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;"&gt;$7,689,378,026&lt;/span&gt;&lt;/div&gt;
            &lt;/td&gt;
         &lt;/tr&gt;
         &lt;tr&gt;
            &lt;td colspan="1" style="border-bottom:0.75pt solid #6B6B6B;vertical-align:top"&gt;
               &lt;div style="background-color:#FFFFFF;padding-left:2pt;padding-top:1pt;padding-bottom:0;align:left;text-align:left;padding-right:2pt;font-family:Arial, Helvetica, sans-serif;font-size:10pt;margin-top:1pt;margin-bottom:0;"&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;&lt;b&gt;Total Number of Portfolio Holdings (reflects holdings of &lt;/b&gt;&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;&lt;b&gt;U.S. Treasury Reserves Portfolio)&lt;/b&gt;&lt;/span&gt;&lt;/div&gt;
            &lt;/td&gt;
            &lt;td colspan="1" style="border-bottom:0.75pt solid #6B6B6B;vertical-align:bottom"&gt;
               &lt;div style="background-color:#FFFFFF;padding-left:2pt;padding-top:1pt;padding-bottom:0;align:right;text-align:right;padding-right:2pt;font-family:Arial, Helvetica, sans-serif;font-size:10pt;margin-top:1pt;margin-bottom:0;"&gt;&lt;span style="font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;"&gt;62&lt;/span&gt;&lt;/div&gt;
            &lt;/td&gt;
         &lt;/tr&gt;
         &lt;tr&gt;
            &lt;td colspan="1" style="vertical-align:top"&gt;
               &lt;div style="background-color:#FFFFFF;padding-left:2pt;padding-top:1pt;padding-bottom:0;align:left;text-align:left;padding-right:2pt;font-family:Arial, Helvetica, sans-serif;font-size:10pt;margin-top:1pt;margin-bottom:0;"&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;&lt;b&gt;Total Management Fee Paid&lt;/b&gt;&lt;/span&gt;&lt;/div&gt;
            &lt;/td&gt;
            &lt;td colspan="1" style="vertical-align:bottom"&gt;
               &lt;div style="background-color:#FFFFFF;padding-left:2pt;padding-top:1pt;padding-bottom:0;align:right;text-align:right;padding-right:2pt;font-family:Arial, Helvetica, sans-serif;font-size:10pt;margin-top:1pt;margin-bottom:0;"&gt;&lt;span style="font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;"&gt;$12,062,390&lt;/span&gt;&lt;/div&gt;
            &lt;/td&gt;
         &lt;/tr&gt;
      &lt;/table&gt;&lt;/div&gt;</oef:AddlFundStatisticsTextBlock>
    <us-gaap:AssetsNet
      contextRef="c_8366_instant_WesternAssetInstitutionalUSTreasuryReserves_ClassInvestorShares_2026-08-31Member"
      decimals="INF"
      id="ixv-9691"
      unitRef="USD">7689378026</us-gaap:AssetsNet>
    <oef:HoldingsCount
      contextRef="c_8366_instant_WesternAssetInstitutionalUSTreasuryReserves_ClassInvestorShares_2026-08-31Member"
      decimals="INF"
      id="ixv-9692"
      unitRef="UNIT">62</oef:HoldingsCount>
    <oef:AdvisoryFeesPaidAmt
      contextRef="c_8366_duration_WesternAssetInstitutionalUSTreasuryReserves_ClassInvestorShares_2025-09-01_2026-08-31Member"
      decimals="INF"
      id="ixv-9693"
      unitRef="USD">12062390</oef:AdvisoryFeesPaidAmt>
    <oef:HoldingsTableTextBlock
      contextRef="c_8366_duration_WesternAssetInstitutionalUSTreasuryReserves_ClassInvestorShares_2025-09-01_2026-08-31Member"
      id="foot-8366_902702-1011"
      xml:lang="en-US">&lt;div&gt;&lt;span style="text-transform:uppercase;"&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:12.024pt;text-transform:uppercase;color:#1447FF;;"&gt;&lt;b&gt;WHAT DID THE FUND INVEST IN? &lt;/b&gt;&lt;/span&gt;&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.824pt;color:#2D2D2D;;"&gt;(as of &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.824pt;color:#2D2D2D;;"&gt;August 31, 2026)&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:12.024pt;color:#161616;;"&gt;&lt;b&gt;Portfolio Composition&lt;/b&gt;&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:12.024pt;color:#161616;;"&gt;&lt;sup&gt;*&lt;/sup&gt;&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:12.024pt;color:#161616;;"&gt;&lt;b&gt; &lt;/b&gt;&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:12.024pt;color:#161616;;"&gt;&lt;b&gt;(% of Total Investments)&lt;/b&gt;&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;img alt="image" src="ts8366img004.jpg" style="width:96.41294838145232%"/&gt;&lt;/div&gt;</oef:HoldingsTableTextBlock>
    <oef:UpdProspectusWebAddress
      contextRef="c_8366_duration_WesternAssetInstitutionalUSTreasuryReserves_ClassInvestorShares_2025-09-01_2026-08-31Member"
      id="ixv-649"
      xml:lang="en-US">https://www.franklintempleton.com/regulatory-fund-documents</oef:UpdProspectusWebAddress>
    <oef:PctOfTotalInv
      contextRef="c_8366_instant_WesternAssetInstitutionalUSTreasuryReserves_ClassInvestorShares_2026-08-31_4121Member"
      decimals="INF"
      id="ixv-9694"
      unitRef="RATIO">0.741</oef:PctOfTotalInv>
    <oef:PctOfTotalInv
      contextRef="c_8366_instant_WesternAssetInstitutionalUSTreasuryReserves_ClassInvestorShares_2026-08-31_4124Member"
      decimals="INF"
      id="ixv-9695"
      unitRef="RATIO">0.259</oef:PctOfTotalInv>
    <oef:FundName
      contextRef="c_8356_duration_WesternAssetInstitutionalUSTreasuryReserves_ClassDigitalInstitutionalShares_2025-09-01_2026-08-31Member"
      id="ixv-701"
      xml:lang="en-US">Western Asset Institutional U.S. Treasury Reserves</oef:FundName>
    <oef:ClassName
      contextRef="c_8356_duration_WesternAssetInstitutionalUSTreasuryReserves_ClassDigitalInstitutionalShares_2025-09-01_2026-08-31Member"
      id="ixv-707"
      xml:lang="en-US">Digital Institutional Shares</oef:ClassName>
    <dei:TradingSymbol
      contextRef="c_8356_duration_WesternAssetInstitutionalUSTreasuryReserves_ClassDigitalInstitutionalShares_2025-09-01_2026-08-31Member"
      id="ixv-710"
      xml:lang="en-US">DIGXX</dei:TradingSymbol>
    <dei:DocumentPeriodEndDate
      contextRef="c_8365_duration_WesternAssetInstitutionalUSTreasuryReserves_2025-09-01_2026-08-31Member"
      id="ixv-716"
      xml:lang="en-US">2026-08-31</dei:DocumentPeriodEndDate>
    <oef:AnnlOrSemiAnnlStatementTextBlock
      contextRef="c_8356_duration_WesternAssetInstitutionalUSTreasuryReserves_ClassDigitalInstitutionalShares_2025-09-01_2026-08-31Member"
      id="ixv-725"
      xml:lang="en-US">&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#161616;;"&gt;This &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#161616;;"&gt;annual shareholder report&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#161616;;"&gt; contains important information about &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#161616;;"&gt;Western Asset Institutional U.S. Treasury Reserves for the period &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#161616;;"&gt;September 1, 2025, to &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#161616;;"&gt;August 31, 2026.&lt;/span&gt;</oef:AnnlOrSemiAnnlStatementTextBlock>
    <oef:ShareholderReportAnnualOrSemiAnnual
      contextRef="c_8365_duration_WesternAssetInstitutionalUSTreasuryReserves_2025-09-01_2026-08-31Member"
      id="ixv-727"
      xml:lang="en-US">annual shareholder report</oef:ShareholderReportAnnualOrSemiAnnual>
    <oef:AddlInfoTextBlock
      contextRef="c_8356_duration_WesternAssetInstitutionalUSTreasuryReserves_ClassDigitalInstitutionalShares_2025-09-01_2026-08-31Member"
      id="ixv-734"
      xml:lang="en-US">&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#161616;;"&gt;You can find additional information about the Fund at &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;;"&gt;https://www.franklintempleton.com/regulatory-fund-documents&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#161616;;"&gt;. You can also &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#161616;;"&gt;request this information by contacting us at &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#161616;;"&gt;1-800-625-4554, or 1-203-703-6002&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#161616;;"&gt;.&lt;/span&gt;</oef:AddlInfoTextBlock>
    <oef:AddlInfoWebsite
      contextRef="c_8356_duration_WesternAssetInstitutionalUSTreasuryReserves_ClassDigitalInstitutionalShares_2025-09-01_2026-08-31Member"
      id="ixv-736"
      xml:lang="en-US">https://www.franklintempleton.com/regulatory-fund-documents</oef:AddlInfoWebsite>
    <oef:AddlInfoPhoneNumber
      contextRef="c_8356_duration_WesternAssetInstitutionalUSTreasuryReserves_ClassDigitalInstitutionalShares_2025-09-01_2026-08-31Member"
      id="ixv-740"
      xml:lang="en-US">1-800-625-4554, or 1-203-703-6002</oef:AddlInfoPhoneNumber>
    <oef:ExpensesTextBlock
      contextRef="c_8356_duration_WesternAssetInstitutionalUSTreasuryReserves_ClassDigitalInstitutionalShares_2025-09-01_2026-08-31Member"
      id="foot-8356_901451-1011"
      xml:lang="en-US">&lt;div&gt;&lt;span style="text-transform:uppercase;"&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:12.024pt;text-transform:uppercase;color:#1447FF;;"&gt;&lt;b&gt;WHAT WERE THE FUND COSTS FOR THE LAST YEAR? &lt;/b&gt;&lt;/span&gt;&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.824pt;color:#2D2D2D;;"&gt;(based on a hypothetical $10,000 investment)&lt;/span&gt;&lt;/div&gt;&lt;div&gt;
      &lt;table cellspacing="0" style="width:98%;cellspacing:0;border-top:1.5pt solid #E6FAFF;border-left:1.5pt solid #E6FAFF;  border-right:1.5pt solid #E6FAFF;  border-bottom:1.5pt solid #E6FAFF; margin-left:7.9pt;"&gt;
         &lt;tr style="height:1px;"&gt;
            &lt;td style="height:1px;width:50%;background-color:#E6FAFF;"&gt;&lt;/td&gt;
            &lt;td style="height:1px;width:22.33812949640288%;background-color:#E6FAFF;"&gt;&lt;/td&gt;
            &lt;td style="height:1px;width:27.661870503597125%;background-color:#E6FAFF;"&gt;&lt;/td&gt;
         &lt;/tr&gt;
         &lt;tr&gt;
            &lt;td colspan="1" style="background-color:#E6FAFF;;border-bottom:1.5pt solid #1447FF;vertical-align:bottom"&gt;
               &lt;div style="background-color:#E6FAFF;padding-left:2pt;padding-top:1.5pt;padding-bottom:0;align:left;text-align:left;padding-right:2pt;font-family:Arial, Helvetica, sans-serif;font-size:10pt;margin-top:1pt;margin-bottom:0;"&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;;"&gt;&lt;b&gt;Class Name&lt;/b&gt;&lt;/span&gt;&lt;/div&gt;
            &lt;/td&gt;
            &lt;td colspan="1" style="background-color:#E6FAFF;;border-bottom:1.5pt solid #1447FF;vertical-align:bottom"&gt;
               &lt;div style="background-color:#E6FAFF;padding-left:2pt;padding-top:1.5pt;padding-bottom:0;align:center;text-align:center;padding-right:2pt;font-family:Arial, Helvetica, sans-serif;font-size:10pt;margin-top:1pt;margin-bottom:0;"&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;;"&gt;&lt;b&gt;Costs of a $10,000 &lt;/b&gt;&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;;"&gt;&lt;b&gt;investment&lt;/b&gt;&lt;/span&gt;&lt;/div&gt;
            &lt;/td&gt;
            &lt;td colspan="1" style="background-color:#E6FAFF;;border-bottom:1.5pt solid #1447FF;vertical-align:bottom"&gt;
               &lt;div style="background-color:#E6FAFF;padding-left:2pt;padding-top:1.5pt;padding-bottom:0;align:center;text-align:center;padding-right:2pt;font-family:Arial, Helvetica, sans-serif;font-size:10pt;margin-top:1pt;margin-bottom:0;"&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;;"&gt;&lt;b&gt;Costs paid as a percentage of a &lt;/b&gt;&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;;"&gt;&lt;b&gt;$10,000 investment&lt;/b&gt;&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;;"&gt;&lt;sup&gt;*&lt;/sup&gt;&lt;/span&gt;
               &lt;/div&gt;
            &lt;/td&gt;
         &lt;/tr&gt;
         &lt;tr&gt;
            &lt;td colspan="1" style="background-color:#E6FAFF;;vertical-align:bottom"&gt;
               &lt;div style="background-color:#E6FAFF;padding-left:2pt;padding-top:1.5pt;padding-bottom:0;align:left;text-align:left;padding-right:2pt;font-family:Arial, Helvetica, sans-serif;font-size:10pt;margin-top:1pt;margin-bottom:0;"&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;;"&gt;Digital Institutional Shares&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:7.5pt;;"&gt;&lt;sup&gt;1&lt;/sup&gt;&lt;/span&gt;
               &lt;/div&gt;
            &lt;/td&gt;
            &lt;td colspan="1" style="background-color:#E6FAFF;;vertical-align:bottom"&gt;
               &lt;div style="background-color:#E6FAFF;padding-left:2pt;padding-top:1.5pt;padding-bottom:0;align:center;text-align:center;padding-right:2pt;font-family:Arial, Helvetica, sans-serif;font-size:10pt;margin-top:1pt;margin-bottom:0;"&gt;&lt;span style="font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;"&gt;$12&lt;/span&gt;&lt;/div&gt;
            &lt;/td&gt;
            &lt;td colspan="1" style="background-color:#E6FAFF;;white-space:nowrap;vertical-align:bottom"&gt;
               &lt;div style="background-color:#E6FAFF;padding-left:2pt;padding-top:1.5pt;padding-bottom:0;align:center;text-align:center;padding-right:2pt;font-family:Arial, Helvetica, sans-serif;font-size:10pt;margin-top:1pt;margin-bottom:0;"&gt;&lt;span style="font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;"&gt;0.18%&lt;/span&gt;&lt;/div&gt;
            &lt;/td&gt;
         &lt;/tr&gt;
      &lt;/table&gt;&lt;/div&gt;</oef:ExpensesTextBlock>
    <oef:ExpensesPaidAmt
      contextRef="c_8356_duration_WesternAssetInstitutionalUSTreasuryReserves_ClassDigitalInstitutionalShares_2025-09-01_2026-08-31Member"
      decimals="INF"
      id="foot-8356_901451-1021"
      unitRef="USD">12</oef:ExpensesPaidAmt>
    <oef:ExpenseRatioPct
      contextRef="c_8356_duration_WesternAssetInstitutionalUSTreasuryReserves_ClassDigitalInstitutionalShares_2025-09-01_2026-08-31Member"
      decimals="INF"
      id="foot-8356_901451-1031"
      unitRef="RATIO">0.0018</oef:ExpenseRatioPct>
    <oef:FactorsAffectingPerfTextBlock
      contextRef="c_8356_duration_WesternAssetInstitutionalUSTreasuryReserves_ClassDigitalInstitutionalShares_2025-09-01_2026-08-31Member"
      id="ixv-812"
      xml:lang="en-US">&lt;div&gt;&lt;span style="text-transform:uppercase;"&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:12.024pt;text-transform:uppercase;color:#1447FF;;"&gt;&lt;b&gt;HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE?&lt;/b&gt;&lt;/span&gt;&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;As of August 31, 2026, the seven-day current yield for &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;Digital Institutional Shares of the Western Asset Institutional U.S. Treasury &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;Reserves was &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;3.61% and the seven-day effective yield was &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;3.67%. The seven-day current yield represents net interest income &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;generated by the Fund&#x2019;s investments for the past seven days and assumes income is generated each week over a 365-day period. &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;The seven-day effective yield assumes reinvestment of the coupon (interest payments) and will typically be slightly higher than the &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;current yield because of the compounding effect on investment returns.&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;The Fund maintained a neutral/long maturity stance during the latter part of the reporting period to benefit from a steeper yield curve. &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;The positioning was a positive contributor to performance.&lt;/span&gt;&lt;/div&gt;</oef:FactorsAffectingPerfTextBlock>
    <oef:PerformancePastDoesNotIndicateFuture
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      xml:lang="en-US">The Fund&#x2019;s past performance is not necessarily an indication of how the Fund will perform in the future.</oef:PerformancePastDoesNotIndicateFuture>
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      contextRef="c_8356_duration_WesternAssetInstitutionalUSTreasuryReserves_ClassDigitalInstitutionalShares_2025-09-01_2026-08-31Member"
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      xml:lang="en-US">&lt;div&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;For current month-end performance, please call Franklin Templeton at &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;1-800-625-4554, or 1-203-703-6002 or visit&lt;/span&gt;&lt;br/&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;;"&gt;https://www.franklintempleton.com/investments/options/money-market-funds&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;. &lt;/span&gt;&lt;/div&gt;</oef:UpdPerfInfoLocationTextBlock>
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      xml:lang="en-US">&lt;div&gt;&lt;span style="text-transform:uppercase;"&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:12.024pt;text-transform:uppercase;color:#1447FF;;"&gt;&lt;b&gt;KEY FUND STATISTICS &lt;/b&gt;&lt;/span&gt;&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.824pt;color:#2D2D2D;;"&gt;(as of &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.824pt;color:#2D2D2D;;"&gt;August 31, 2026)&lt;/span&gt;&lt;/div&gt;&lt;div&gt;
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         &lt;tr style="height:1px;"&gt;
            &lt;td style="height:1px;width:74.41007194244604%;"&gt;&lt;/td&gt;
            &lt;td style="height:1px;width:25.58992805755396%;"&gt;&lt;/td&gt;
         &lt;/tr&gt;
         &lt;tr&gt;
            &lt;td colspan="1" style="border-bottom:0.75pt solid #6B6B6B;vertical-align:top"&gt;
               &lt;div style="background-color:#FFFFFF;padding-left:2pt;padding-top:1pt;padding-bottom:0;align:left;text-align:left;padding-right:2pt;font-family:Arial, Helvetica, sans-serif;font-size:10pt;margin-top:1pt;margin-bottom:0;"&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;&lt;b&gt;Total Net Assets&lt;/b&gt;&lt;/span&gt;&lt;/div&gt;
            &lt;/td&gt;
            &lt;td colspan="1" style="border-bottom:0.75pt solid #6B6B6B;vertical-align:bottom"&gt;
               &lt;div style="background-color:#FFFFFF;padding-left:2pt;padding-top:1pt;padding-bottom:0;align:right;text-align:right;padding-right:2pt;font-family:Arial, Helvetica, sans-serif;font-size:10pt;margin-top:1pt;margin-bottom:0;"&gt;&lt;span style="font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;"&gt;$7,689,378,026&lt;/span&gt;&lt;/div&gt;
            &lt;/td&gt;
         &lt;/tr&gt;
         &lt;tr&gt;
            &lt;td colspan="1" style="border-bottom:0.75pt solid #6B6B6B;vertical-align:top"&gt;
               &lt;div style="background-color:#FFFFFF;padding-left:2pt;padding-top:1pt;padding-bottom:0;align:left;text-align:left;padding-right:2pt;font-family:Arial, Helvetica, sans-serif;font-size:10pt;margin-top:1pt;margin-bottom:0;"&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;&lt;b&gt;Total Number of Portfolio Holdings (reflects holdings of &lt;/b&gt;&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;&lt;b&gt;U.S. Treasury Reserves Portfolio)&lt;/b&gt;&lt;/span&gt;&lt;/div&gt;
            &lt;/td&gt;
            &lt;td colspan="1" style="border-bottom:0.75pt solid #6B6B6B;vertical-align:bottom"&gt;
               &lt;div style="background-color:#FFFFFF;padding-left:2pt;padding-top:1pt;padding-bottom:0;align:right;text-align:right;padding-right:2pt;font-family:Arial, Helvetica, sans-serif;font-size:10pt;margin-top:1pt;margin-bottom:0;"&gt;&lt;span style="font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;"&gt;62&lt;/span&gt;&lt;/div&gt;
            &lt;/td&gt;
         &lt;/tr&gt;
         &lt;tr&gt;
            &lt;td colspan="1" style="vertical-align:top"&gt;
               &lt;div style="background-color:#FFFFFF;padding-left:2pt;padding-top:1pt;padding-bottom:0;align:left;text-align:left;padding-right:2pt;font-family:Arial, Helvetica, sans-serif;font-size:10pt;margin-top:1pt;margin-bottom:0;"&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;color:#2D2D2D;;"&gt;&lt;b&gt;Total Management Fee Paid&lt;/b&gt;&lt;/span&gt;&lt;/div&gt;
            &lt;/td&gt;
            &lt;td colspan="1" style="vertical-align:bottom"&gt;
               &lt;div style="background-color:#FFFFFF;padding-left:2pt;padding-top:1pt;padding-bottom:0;align:right;text-align:right;padding-right:2pt;font-family:Arial, Helvetica, sans-serif;font-size:10pt;margin-top:1pt;margin-bottom:0;"&gt;&lt;span style="font-family:Arial, Helvetica, sans-serif;font-size:10.02pt;"&gt;$12,062,390&lt;/span&gt;&lt;/div&gt;
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      xml:lang="en-US">&lt;div&gt;&lt;span style="text-transform:uppercase;"&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:12.024pt;text-transform:uppercase;color:#1447FF;;"&gt;&lt;b&gt;WHAT DID THE FUND INVEST IN? &lt;/b&gt;&lt;/span&gt;&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.824pt;color:#2D2D2D;;"&gt;(as of &lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:10.824pt;color:#2D2D2D;;"&gt;August 31, 2026)&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:12.024pt;color:#161616;;"&gt;&lt;b&gt;Portfolio Composition&lt;/b&gt;&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:12.024pt;color:#161616;;"&gt;&lt;sup&gt;*&lt;/sup&gt;&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:12.024pt;color:#161616;;"&gt;&lt;b&gt; &lt;/b&gt;&lt;/span&gt;&lt;span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:12.024pt;color:#161616;;"&gt;&lt;b&gt;(% of Total Investments)&lt;/b&gt;&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;img alt="image" src="ts8356img004.jpg" style="width:96.41294838145232%"/&gt;&lt;/div&gt;</oef:HoldingsTableTextBlock>
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    <oef:PctOfTotalInv
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        <link:footnote id="WSF_8365_902580_91364" xlink:label="WSF_8365_902580_91364" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en"><xhtml:table style="padding-top:5pt;width:100%;cellspacing:0;margin-left:8pt;"><xhtml:tr><xhtml:td style="vertical-align:top;font-family:Arial, Helvetica, sans-serif;font-size:6pt;text-align:left;align:left;width:2%;"><xhtml:span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:8.02pt;color:#6B6B6B;;">*</xhtml:span></xhtml:td><xhtml:td style="padding-bottom:0pt;padding-top:-10.02pt;padding-left:2pt;padding-right:0pt;"><xhtml:span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:9.02pt;color:#6B6B6B;;">Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher. Additional amounts may be voluntarily </xhtml:span><xhtml:span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:9.02pt;color:#6B6B6B;;">waived and/or reimbursed from time to time.</xhtml:span></xhtml:td></xhtml:tr></xhtml:table></link:footnote>
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        <link:footnote id="WSF_8365_902589_89133" xlink:label="WSF_8365_902589_89133" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en"><xhtml:table style="padding-top:5pt;width:100%;cellspacing:0;margin-left:8pt;"><xhtml:tr><xhtml:td style="vertical-align:top;font-family:Arial, Helvetica, sans-serif;font-size:6pt;text-align:left;align:left;width:2%;"><xhtml:span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:8.02pt;color:#6B6B6B;;">*</xhtml:span></xhtml:td><xhtml:td style="padding-bottom:0pt;padding-top:-10.02pt;padding-left:2pt;padding-right:0pt;"><xhtml:span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:9.02pt;color:#6B6B6B;;">Reflects holdings of </xhtml:span><xhtml:span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:9.02pt;color:#6B6B6B;;">U.S. Treasury Reserves Portfolio.</xhtml:span></xhtml:td></xhtml:tr></xhtml:table></link:footnote>
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        <link:footnote id="WSF_8366_902691_91364" xlink:label="WSF_8366_902691_91364" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en"><xhtml:table style="padding-top:5pt;width:100%;cellspacing:0;margin-left:8pt;"><xhtml:tr><xhtml:td style="vertical-align:top;font-family:Arial, Helvetica, sans-serif;font-size:6pt;text-align:left;align:left;width:2%;"><xhtml:span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:8.02pt;color:#6B6B6B;;">*</xhtml:span></xhtml:td><xhtml:td style="padding-bottom:0pt;padding-top:-10.02pt;padding-left:2pt;padding-right:0pt;"><xhtml:span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:9.02pt;color:#6B6B6B;;">Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher. Additional amounts may be voluntarily </xhtml:span><xhtml:span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:9.02pt;color:#6B6B6B;;">waived and/or reimbursed from time to time.</xhtml:span></xhtml:td></xhtml:tr></xhtml:table></link:footnote>
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        <link:footnote id="WSF_8366_902700_89133" xlink:label="WSF_8366_902700_89133" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en"><xhtml:table style="padding-top:5pt;width:100%;cellspacing:0;margin-left:8pt;"><xhtml:tr><xhtml:td style="vertical-align:top;font-family:Arial, Helvetica, sans-serif;font-size:6pt;text-align:left;align:left;width:2%;"><xhtml:span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:8.02pt;color:#6B6B6B;;">*</xhtml:span></xhtml:td><xhtml:td style="padding-bottom:0pt;padding-top:-10.02pt;padding-left:2pt;padding-right:0pt;"><xhtml:span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:9.02pt;color:#6B6B6B;;">Reflects holdings of </xhtml:span><xhtml:span style="clear:both;font-family:Arial, Helvetica, sans-serif;font-size:9.02pt;color:#6B6B6B;;">U.S. Treasury Reserves Portfolio.</xhtml:span></xhtml:td></xhtml:tr></xhtml:table></link:footnote>
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