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      id="t_1_380bd98a_9832_7098_689f_59b63fe23d61">&lt;div style="line-height:13.00pt;margin-top:0.00pt;text-align:left;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:11pt;font-weight:bold"&gt;Investment Objective&lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:8pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;font-weight:bold;margin-left:0%"&gt;BlackRock Taxable Municipal Bond Trust&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;font-weight:bold"&gt;&#x2019;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;font-weight:bold"&gt;s&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;font-weight:bold"&gt; (&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;font-weight:bold"&gt;BBN&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;font-weight:bold"&gt;) (the &#x201c;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;font-weight:bold"&gt;Trust&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;font-weight:bold"&gt;&#x201d;)&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt; primary investment objective is to seek high current income, with a secondary objective of capital &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;appreciation. The Trust seeks to achieve its investment objectives by investing primarily in a portfolio of taxable municipal securities, including Build America Bonds (&#x201c;BABs&#x201d;), &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;issued by state and local governments to finance capital projects such as public schools, roads, transportation infrastructure, bridges, ports and public buildings.&lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:8pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;Under normal market conditions, the Trust will invest at least 80% of its managed assets in taxable municipal securities, which include BABs. &#160;The Fund&#x2019;s investments in &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;derivatives will be counted toward the Fund&#x2019;s 80% policy to the extent that they provide investment exposure to the securities included within that policy or to one or more &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;market risk factors associated with such securities. Under normal market conditions, the Trust will invest at least 80% of its managed assets in securities that at the time of &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;investment are investment grade quality.&lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:8pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;As used herein, &#x201c;managed assets&#x201d; means the total assets of the Trust (including any assets attributable to money borrowed for investment purposes) minus the sum of the &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;Trust&#x2019;s accrued liabilities (other than money borrowed for investment purposes).&lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:8pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;As of June 30, 2026, 39% of the Trust&#x2019;s portfolio is composed of BABs. Like other taxable municipal securities, interest received on BABs is subject to U.S. tax and may be &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;subject to state income tax. Issuers of direct pay BABs, however, are eligible to receive a subsidy from the U.S. Treasury of up to 35% of the interest paid on the BABs. This &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;allowed such issuers to issue bonds that pay interest rates that were expected to be competitive with the rates typically paid by private bond issuers in the taxable fixed income &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;market. While the U.S. Treasury subsidizes the interest paid on BABs, it does not guarantee the principal or interest payments on BABs, and there is no guarantee that the &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;U.S. Treasury will not reduce or eliminate the subsidy for BABs in the future. Any interruption, delay, reduction and/or offset of the reimbursement from the U.S. Treasury may &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;reduce the demand for direct pay BABs and/or potentially trigger extraordinary call features of the BABs. As of the date of this report, the subsidy that issuers of direct pay BABs &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;receive from the U.S. Treasury has been reduced from its original level as the result of budgetary sequestration. The extraordinary call features of some BABs permit early &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;redemption at par value, and the reduction in the subsidy issuers of direct pay BABs receive from the U.S. Treasury has resulted, and may continue to result, in early &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;redemptions of some BABs at par value. Such early redemptions at par value may result in a potential loss in value for investors of such BABs, who may have purchased the &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;securities at prices above par, and may require such investors to reinvest redemption proceeds in lower-yielding securities. As of the date of this report, the Trust did not own &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;any BABs subject to a par value extraordinary call feature. Additionally, many BABs also have more typical call provisions that permit early redemption at a stated spread to an &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;applicable prevailing U.S. Treasury rate. Early redemptions in accordance with these call provisions may likewise result in potential losses for the Trust and give rise to &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;reinvestment risk, which could reduce the Trust&#x2019;s income and distributions.&lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:8pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;No assurance can be given that the Trust&#x2019;s investment objective will be achieved.&lt;/span&gt;&lt;/div&gt;</cef:InvestmentObjectivesAndPracticesTextBlock>
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      id="t_2_98c3e1ed_ee51_f5ed_efc1_7b7d183f3a9e">&lt;div style="margin-top:11.5pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:11pt;font-weight:bold"&gt;Market Price and Net Asset Value Per Share Summary&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:0.1pt"&gt;&#x2003;&lt;/span&gt;&lt;/div&gt;
&lt;table cellpadding="0" cellspacing="0" style="border-bottom:0.5pt solid #000000;empty-cells:show;margin-left:12pt;width:535pt"&gt; 
&lt;tr style="height:16.5pt"&gt; 
&lt;td style="border-bottom:0.5pt solid #000000;vertical-align:Bottom;width:323.19pt;"&gt; &lt;div style="line-height:0.5pt;text-align:left;"&gt; &lt;div style="margin-right:6pt;text-align:right;white-space:nowrap;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;&#160;&lt;/span&gt;&lt;/div&gt; &lt;/div&gt; &lt;/td&gt; 
&lt;td style="border-bottom:0.5pt solid #000000;vertical-align:Bottom;width:41.53pt;"&gt; &lt;div style="line-height:11.0pt;text-align:left;"&gt; &lt;div style="margin-left:4pt;margin-right:8pt;text-align:right;white-space:nowrap;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:8pt;font-style:italic"&gt;06/30/26&lt;/span&gt;&lt;/div&gt; &lt;/div&gt; &lt;/td&gt; 
&lt;td style="border-bottom:0.5pt solid #000000;vertical-align:Bottom;width:45.53pt;"&gt; &lt;div style="line-height:11.0pt;text-align:left;"&gt; &lt;div style="margin-left:8pt;margin-right:8pt;text-align:right;white-space:nowrap;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:8pt;font-style:italic"&gt;12/31/25&lt;/span&gt;&lt;/div&gt; &lt;/div&gt; &lt;/td&gt; 
&lt;td style="border-bottom:0.5pt solid #000000;vertical-align:Bottom;width:42.97pt;"&gt; &lt;div style="line-height:11.0pt;text-align:left;"&gt; &lt;div style="margin-left:8pt;margin-right:8pt;text-align:right;white-space:nowrap;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:8pt;font-style:italic"&gt;Change&lt;/span&gt;&lt;/div&gt; &lt;/div&gt; &lt;/td&gt; 
&lt;td style="border-bottom:0.5pt solid #000000;vertical-align:Bottom;width:41.89pt;"&gt; &lt;div style="line-height:11.0pt;text-align:left;"&gt; &lt;div style="margin-left:8pt;margin-right:8pt;text-align:right;white-space:nowrap;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:8pt;font-style:italic"&gt;High&lt;/span&gt;&lt;/div&gt; &lt;/div&gt; &lt;/td&gt; 
&lt;td style="border-bottom:0.5pt solid #000000;vertical-align:Bottom;width:39.89pt;"&gt; &lt;div style="line-height:11.0pt;text-align:left;"&gt; &lt;div style="margin-left:8pt;margin-right:6pt;text-align:right;white-space:nowrap;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:8pt;font-style:italic"&gt;Low&lt;/span&gt;&lt;/div&gt; &lt;/div&gt; &lt;/td&gt; &lt;/tr&gt; 
&lt;tr style="height:11.5pt"&gt; 
&lt;td style="background-color:azure;vertical-align:Bottom;width:323.19pt;"&gt; &lt;div style="line-height:10pt;text-align:left;"&gt; &lt;div style="margin-right:6pt;text-align:left;white-space:nowrap;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:8pt;margin-left:0.0pt"&gt;Closing Market Price&lt;/span&gt;&lt;/div&gt; &lt;/div&gt; &lt;/td&gt; 
&lt;td style="background-color:azure;vertical-align:Bottom;white-space:nowrap;width:41.53pt;"&gt; &lt;div style="line-height:10pt;margin-left:6pt;margin-right:10pt;text-align:right;width:25.53pt;"&gt; &lt;div style="display:flex;margin-left:auto;width:25.53pt;"&gt; &lt;div style="display:flex;white-space:nowrap;width:25.53pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:8pt;width:25.53pt"&gt;$&#x2009;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:8pt;width:25.53pt"&gt;16.17&lt;/span&gt;&lt;/div&gt; &lt;/div&gt; &lt;/div&gt; &lt;/td&gt; 
&lt;td style="background-color:azure;vertical-align:Bottom;white-space:nowrap;width:45.53pt;"&gt; &lt;div style="line-height:10pt;margin-left:10pt;margin-right:10pt;text-align:right;width:25.53pt;"&gt; &lt;div style="display:flex;margin-left:auto;width:25.53pt;"&gt; &lt;div style="display:flex;white-space:nowrap;width:25.53pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:8pt;width:25.53pt"&gt;$&#x2009;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:8pt;width:25.53pt"&gt;16.32&lt;/span&gt;&lt;/div&gt; &lt;/div&gt; &lt;/div&gt; &lt;/td&gt; 
&lt;td style="background-color:azure;vertical-align:Bottom;white-space:nowrap;width:42.97pt;"&gt; &lt;div style="line-height:10pt;margin-left:10pt;margin-right:10pt;text-align:right;width:22.97pt;"&gt; &lt;div style="display:flex;margin-left:auto;width:22.97pt;"&gt; &lt;div style="display:flex;white-space:nowrap;width:22.97pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:8pt;width:22.97pt"&gt;(0.92&lt;/span&gt;&lt;/div&gt; &lt;div style="display:flex;width:22.97pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:8pt;width:auto"&gt;)&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:8pt;width:auto"&gt;%&#x2009;&lt;/span&gt;&lt;/div&gt; &lt;/div&gt; &lt;/div&gt; &lt;/td&gt; 
&lt;td style="background-color:azure;vertical-align:Bottom;white-space:nowrap;width:41.89pt;"&gt; &lt;div style="line-height:10pt;margin-left:10pt;margin-right:10pt;text-align:right;width:21.89pt;"&gt; &lt;div style="display:flex;margin-left:auto;width:21.89pt;"&gt; &lt;div style="display:flex;white-space:nowrap;width:21.89pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:8pt;width:21.89pt"&gt;$&#x2009;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:8pt;width:21.89pt"&gt;16.73&lt;/span&gt;&lt;/div&gt; &lt;/div&gt; &lt;/div&gt; &lt;/td&gt; 
&lt;td style="background-color:azure;vertical-align:Bottom;white-space:nowrap;width:39.89pt;"&gt; &lt;div style="line-height:10pt;margin-left:10pt;margin-right:4pt;text-align:right;width:21.89pt;"&gt; &lt;div style="display:flex;margin-left:auto;width:21.89pt;"&gt; &lt;div style="display:flex;white-space:nowrap;width:21.89pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:8pt;width:21.89pt"&gt;$&#x2009;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:8pt;width:21.89pt"&gt;15.52&lt;/span&gt;&lt;/div&gt; &lt;/div&gt; &lt;/div&gt; &lt;/td&gt; &lt;/tr&gt; 
&lt;tr style="height:10.5pt"&gt; 
&lt;td style="vertical-align:Bottom;width:323.19pt;"&gt; &lt;div style="line-height:10pt;text-align:left;"&gt; &lt;div style="margin-right:6pt;text-align:left;white-space:nowrap;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:8pt;margin-left:0.0pt"&gt;Net Asset Value&lt;/span&gt;&lt;/div&gt; &lt;/div&gt; &lt;/td&gt; 
&lt;td style="vertical-align:Bottom;white-space:nowrap;width:41.53pt;"&gt; &lt;div style="line-height:10pt;margin-left:6pt;margin-right:10pt;text-align:right;width:25.53pt;"&gt; &lt;div style="display:flex;margin-left:auto;width:25.53pt;"&gt; &lt;div style="display:flex;white-space:nowrap;width:25.53pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:8pt;width:25.53pt"&gt;17.01&lt;/span&gt;&lt;/div&gt; &lt;/div&gt; &lt;/div&gt; &lt;/td&gt; 
&lt;td style="vertical-align:Bottom;white-space:nowrap;width:45.53pt;"&gt; &lt;div style="line-height:10pt;margin-left:10pt;margin-right:10pt;text-align:right;width:25.53pt;"&gt; &lt;div style="display:flex;margin-left:auto;width:25.53pt;"&gt; &lt;div style="display:flex;white-space:nowrap;width:25.53pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:8pt;width:25.53pt"&gt;17.28&lt;/span&gt;&lt;/div&gt; &lt;/div&gt; &lt;/div&gt; &lt;/td&gt; 
&lt;td style="vertical-align:Bottom;white-space:nowrap;width:42.97pt;"&gt; &lt;div style="line-height:10pt;margin-left:10pt;margin-right:10pt;text-align:right;width:22.97pt;"&gt; &lt;div style="display:flex;margin-left:auto;width:22.97pt;"&gt; &lt;div style="display:flex;white-space:nowrap;width:22.97pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:8pt;width:22.97pt"&gt;(1.56&lt;/span&gt;&lt;/div&gt; &lt;div style="display:flex;width:22.97pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:8pt;width:auto"&gt;)&lt;/span&gt;&lt;/div&gt; &lt;/div&gt; &lt;/div&gt; &lt;/td&gt; 
&lt;td style="vertical-align:Bottom;white-space:nowrap;width:41.89pt;"&gt; &lt;div style="line-height:10pt;margin-left:10pt;margin-right:10pt;text-align:right;width:21.89pt;"&gt; &lt;div style="display:flex;margin-left:auto;width:21.89pt;"&gt; &lt;div style="display:flex;white-space:nowrap;width:21.89pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:8pt;width:21.89pt"&gt;17.80&lt;/span&gt;&lt;/div&gt; &lt;/div&gt; &lt;/div&gt; &lt;/td&gt; 
&lt;td style="vertical-align:Bottom;white-space:nowrap;width:39.89pt;"&gt; &lt;div style="line-height:10pt;margin-left:10pt;margin-right:4pt;text-align:right;width:21.89pt;"&gt; &lt;div style="display:flex;margin-left:auto;width:21.89pt;"&gt; &lt;div style="display:flex;white-space:nowrap;width:21.89pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:8pt;width:21.89pt"&gt;16.54&lt;/span&gt;&lt;/div&gt; &lt;/div&gt; &lt;/div&gt; &lt;/td&gt; &lt;/tr&gt; &lt;/table&gt;</cef:SharePriceTableTextBlock>
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      id="t_6_b79d5f1e_0cd3_404f_9130_ea7fd483dbfe">&lt;div style="float:left;line-height:13.50pt;text-align:left;width:7.87pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:11.5pt;font-style:italic;font-weight:bold"&gt;9.&lt;/span&gt;&lt;/div&gt;&lt;div style="float:left;line-height:13.50pt;margin-left:8.13pt;text-align:left;width:538.00pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:11.5pt;font-style:italic;font-weight:bold"&gt;PRINCIPAL RISKS&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:16.5pt"&gt; &lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:8pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;In the normal course of business, the&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt;&#x2009;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;Trust&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt;&#x2009;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;invests in securities or other instruments and may enter into certain transactions, and such activities subject the&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt;&#x2009;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;Trust to various &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;risks, including among others, fluctuations in the market (market risk) or failure of an issuer to meet all of its obligations. The value of securities or other instruments may also &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;be affected by various factors, including, without limitation: (i) the general economy; (ii) the overall market as well as local, regional or global political and/or social instability; &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;(iii) regulation, taxation, tariffs or international tax treaties between various countries; or (iv) currency, interest rate or price fluctuations. Local, regional or global events such as &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;war, acts of terrorism, the spread of infectious illness or other public health issues, recessions, or other events could have a significant impact on the Trust and its investments.&lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:8pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;The Trust&#160;may hold a significant amount of bonds subject to calls by the issuers at defined dates and prices. When bonds are called by issuers and the Trust&#160;reinvests the &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;proceeds received, such investments may be in securities with lower yields than the bonds originally held, and correspondingly, could adversely impact the yield and total &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;return performance of the&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt;&#x2009;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;Trust.&lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:8pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;The Build America Bonds (&#x201c;BABs&#x201d;) market is smaller, less diverse and less liquid than other types of municipal securities. Since the BABs program expired on December 31, &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;2010 and was not extended, BABs may be less actively traded, which may negatively affect the value of BABs held by the Trust.&lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:8pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;The Trust may invest in BABs. Issuers of direct pay BABs held in the Trust&#x2019;s portfolio receive a subsidy from the U.S. Treasury with respect to interest payment on bonds. There &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;is no assurance that an issuer will comply with the requirements to receive such subsidy or that such subsidy will not be reduced or terminated altogether in the future. As of &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;period end, the subsidy that issuers of direct payment BABs receive from the U.S. Treasury has been reduced as the result of budgetary sequestration, which has resulted, and &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;which may continue to result, in early redemptions of BABs at par value. The early redemption of BABs at par value may result in a potential loss in value for investors of such &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;BABs, including the Trust, who may have purchased the securities at prices above par, and may require the Trust to reinvest redemption proceeds in lower-yielding securities &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;which could reduce the Trust&#x2019;s income and distributions. Moreover, the elimination or reduction in subsidy from the federal government may adversely affect an issuer&#x2019;s ability &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;to repay or refinance BABs and the BABs&#x2019; credit ratings, which, in turn, may adversely affect the value of the BABs held by the Trust and the Trust&#x2019;s NAV.&lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:8pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;font-weight:bold;margin-left:0%"&gt;Illiquidity Risk:&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;&#160;The&#160;Trust may invest without limitation in illiquid or less liquid investments or investments in which no secondary market is readily available or which are &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;otherwise illiquid, including private placement securities. The&#160;Trust may not be able to readily dispose of such investments at prices that approximate those at which the&#160;Trust &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;could sell such investments if they were more widely traded and, as a result of such illiquidity, the&#160;Trust may have to sell other investments or engage in borrowing transactions &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;if necessary to raise funds to meet its obligations. Limited liquidity can also affect the market price of investments, thereby adversely affecting the&#160;Trust&#x2019;s NAV and ability to &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;make dividend distributions. Privately issued debt securities are often of below investment grade quality, frequently are unrated and present many of the same risks as &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;investing in below investment grade public debt securities.&lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:8pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;font-weight:bold;margin-left:0%"&gt;Market Risk:&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt; &#x200a;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;The&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt;&#x2009;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;Trust may be exposed to prepayment risk, which is the risk that borrowers may exercise their option to prepay principal earlier than scheduled during periods &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;of declining interest rates, which would force the&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt;&#x2009;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;Trust to reinvest in lower yielding securities. The&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt;&#x2009;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;Trust&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt;&#x2009;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;may also be exposed to reinvestment risk, which is the risk that income &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;from the&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt;&#x2009;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;Trust&#x2019;s portfolio will decline if the&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt;&#x2009;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;Trust invests the proceeds from matured, traded or called fixed-income securities at market interest rates that are below the&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt;&#x2009;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;Trust &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;portfolio&#x2019;s current earnings rate.&lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:8pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;Municipal securities are subject to the risk that litigation, legislation or other political events, local business or economic conditions, credit rating downgrades, or the bankruptcy &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;of the issuer could have a significant effect on an issuer&#x2019;s ability to make payments of principal and/or interest or otherwise affect the value of such securities. Municipal &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;securities can be significantly affected by political or economic changes, including changes made in the law after issuance of the securities, as well as uncertainties in the &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;municipal market related to, taxation, legislative changes or the rights of municipal security holders, including in connection with an issuer insolvency. Municipal securities &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;backed by current or anticipated revenues from a specific project or specific assets can be negatively affected by the discontinuance of the tax benefits supporting the project &lt;/span&gt;&lt;/div&gt;&lt;div style="line-height:11.00pt;margin-top:0.00pt;text-align:justify;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;or assets or the inability to collect revenues for the project or from the assets. Municipal securities may be less liquid than taxable bonds, and there may be less publicly &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;available information on the financial condition of municipal security issuers than for issuers of other securities.&lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:8pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;font-weight:bold;margin-left:0%"&gt;Valuation Risk: &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt; &#x200a;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;The price the Trust could receive upon the sale of any particular portfolio investment may differ from the Trust&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;&#x2019;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;s valuation of the investment, particularly for &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;securities that trade in thin or volatile markets or that are valued using a fair valuation technique or a price provided by an independent pricing service. Changes to significant &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;unobservable inputs and assumptions (i.e., publicly traded company multiples, growth rate, time to exit) due to the lack of observable inputs may significantly impact the &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;resulting fair value and therefore the Trust&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;&#x2019;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;s results of operations. As a result, the price received upon the sale of an investment may be less than the value ascribed by the &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;Trust, and the Trust could realize a greater than expected loss or lesser than expected gain upon the sale of the investment.&lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:8pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;font-weight:bold;margin-left:0%"&gt;Counterparty Credit Risk:&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt;&#x2009;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;The Trust may be exposed to counterparty credit risk, or the risk that an entity may fail to or be unable to perform on its commitments related to &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;unsettled or open transactions, including making timely interest and/or principal payments or otherwise honoring its obligations. The Trust manages counterparty credit risk by &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;entering into transactions only with counterparties that the Manager believes have the financial resources to honor their obligations and by monitoring the financial stability of &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;those counterparties. Financial assets, which potentially expose the Trust to market, issuer and counterparty credit risks, consist principally of financial instruments and &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;receivables due from counterparties. The extent of the Trust&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;&#x2019;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;s exposure to market, issuer and counterparty credit risks with respect to these financial assets is approximately &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;their value recorded in the Statement of Assets and Liabilities, less any collateral held by the Trust.&lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:8pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;A derivative contract may suffer a mark-to-market loss if the value of the contract decreases due to an unfavorable change in the market rates or values of the underlying &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;instrument. Losses can also occur if the counterparty does not perform under the contract.&lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:8pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;With exchange-traded futures, there is less counterparty credit risk to the Trust since the exchange or clearinghouse, as counterparty to such instruments, guarantees against &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;a possible default. The clearinghouse stands between the buyer and the seller of the contract; therefore, credit risk is limited to failure of the clearinghouse. While offset rights &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;may exist under applicable law, the Trust does not have a contractual right of offset against a clearing broker or clearinghouse in the event of a default (including the bankruptcy &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;or insolvency). Additionally, credit risk exists in exchange-traded futures with respect to initial and variation margin that is held in a clearing broker&#x2019;s customer accounts. While &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;clearing brokers are required to segregate customer margin from their own assets, in the event that a clearing broker becomes insolvent or goes into bankruptcy and at that &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;time there is a shortfall in the aggregate amount of margin held by the clearing broker for all its clients, typically the shortfall would be allocated on a pro rata basis across all &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;the clearing broker&#x2019;s customers, potentially resulting in losses to the Trust.&lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:8pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;font-weight:bold;margin-left:0%"&gt;Geographic/Asset Class&#160;Risk:&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt;&#x2009;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;A diversified portfolio, where this is appropriate and consistent with a fund&#x2019;s objectives, minimizes the risk that a price change of a particular &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;investment will have a material impact on the NAV of a fund. The investment concentrations within the&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt;&#x2009;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;Trust&#x2019;s portfolio are disclosed in its Schedule of Investments.&lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:8pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;The&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt;&#x2009;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;Trust&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt;&#x2009;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;invests a significant portion of its assets in securities within a single or limited number of market sectors. When a fund concentrates its investments in this manner, &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;it assumes the risk that economic, regulatory, political and social conditions affecting such sectors may have a significant impact on the Trust and could affect the income from, &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;or the value or liquidity of, the Trust&#x2019;s portfolio. Investment percentages in specific sectors are presented in the Schedule of Investments.&lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:8pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;The&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt;&#x2009;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;Trust invests a significant portion of its assets in fixed-income securities and/or uses derivatives tied to the fixed-income markets. Changes in market interest rates or &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;economic conditions may affect the value and/or liquidity of such investments. Interest rate risk is the risk that prices of bonds and other fixed-income securities will decrease &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;as interest rates rise and increase as interest rates fall. The Trust may be subject to a greater risk of rising interest rates during a period of historically low interest &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;rates.&#160;Changing interest rates may have unpredictable effects on markets, may result in heightened market volatility, and could negatively impact the Trust&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;&#x2019;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;s performance.&lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:8pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;The&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt;&#x2009;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;Trust&#160;invests a significant portion of its assets in securities of issuers located in the United States.&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt;&#x2009;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;A decrease in imports or exports, changes in trade regulations, inflation &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;and/or an economic recession in the United States may have a material adverse effect on the U.S. economy and the securities listed on U.S. exchanges. Proposed and &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;adopted policy and legislative changes in the United States may also have a significant effect on U.S. markets generally, as well as on the value of certain securities. &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;Governmental agencies project that the United States will continue to maintain elevated public debt levels for the foreseeable future which may constrain future economic &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;growth. Circumstances could arise that could prevent the timely payment of interest or principal on U.S. government debt, such as reaching the legislative &#x201c;debt ceiling.&#x201d; Such &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;non-payment would result in substantial negative consequences for the U.S. economy and the global financial system. If U.S. relations with certain countries deteriorate, it &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;could adversely affect issuers that rely on the United States for trade. The United States has also experienced increased internal unrest and discord. If these trends were to &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;continue, they may have an adverse impact on the U.S. economy and the issuers in which the Trust invests.&lt;/span&gt;&lt;/div&gt;</cef:RiskFactorsTableTextBlock>
    <cef:RiskTextBlock
      contextRef="Q12026_IlliquidityRiskMember"
      id="t_1_80e74888_ec3e_375d_fe35_913bf5d4021a">&lt;div style="margin-top:8pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;font-weight:bold;margin-left:0%"&gt;Illiquidity Risk:&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;&#160;The&#160;Trust may invest without limitation in illiquid or less liquid investments or investments in which no secondary market is readily available or which are &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;otherwise illiquid, including private placement securities. The&#160;Trust may not be able to readily dispose of such investments at prices that approximate those at which the&#160;Trust &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;could sell such investments if they were more widely traded and, as a result of such illiquidity, the&#160;Trust may have to sell other investments or engage in borrowing transactions &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;if necessary to raise funds to meet its obligations. Limited liquidity can also affect the market price of investments, thereby adversely affecting the&#160;Trust&#x2019;s NAV and ability to &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;make dividend distributions. Privately issued debt securities are often of below investment grade quality, frequently are unrated and present many of the same risks as &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;investing in below investment grade public debt securities.&lt;/span&gt;&lt;/div&gt;</cef:RiskTextBlock>
    <cef:RiskTextBlock
      contextRef="Q12026_MarketRisksMember"
      id="t_2_270bf787_e4ae_e893_507d_17d04e114a72">&lt;div style="margin-top:8pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;font-weight:bold;margin-left:0%"&gt;Market Risk:&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt; &#x200a;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;The&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt;&#x2009;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;Trust may be exposed to prepayment risk, which is the risk that borrowers may exercise their option to prepay principal earlier than scheduled during periods &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;of declining interest rates, which would force the&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt;&#x2009;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;Trust to reinvest in lower yielding securities. The&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt;&#x2009;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;Trust&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt;&#x2009;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;may also be exposed to reinvestment risk, which is the risk that income &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;from the&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt;&#x2009;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;Trust&#x2019;s portfolio will decline if the&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt;&#x2009;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;Trust invests the proceeds from matured, traded or called fixed-income securities at market interest rates that are below the&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt;&#x2009;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;Trust &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;portfolio&#x2019;s current earnings rate.&lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:8pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;Municipal securities are subject to the risk that litigation, legislation or other political events, local business or economic conditions, credit rating downgrades, or the bankruptcy &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;of the issuer could have a significant effect on an issuer&#x2019;s ability to make payments of principal and/or interest or otherwise affect the value of such securities. Municipal &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;securities can be significantly affected by political or economic changes, including changes made in the law after issuance of the securities, as well as uncertainties in the &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;municipal market related to, taxation, legislative changes or the rights of municipal security holders, including in connection with an issuer insolvency. Municipal securities &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;backed by current or anticipated revenues from a specific project or specific assets can be negatively affected by the discontinuance of the tax benefits supporting the project &lt;/span&gt;&lt;/div&gt;&lt;div style="line-height:11.00pt;margin-top:0.00pt;text-align:justify;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;or assets or the inability to collect revenues for the project or from the assets. Municipal securities may be less liquid than taxable bonds, and there may be less publicly &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;available information on the financial condition of municipal security issuers than for issuers of other securities.&lt;/span&gt;&lt;/div&gt;</cef:RiskTextBlock>
    <cef:RiskTextBlock
      contextRef="Q12026_ValuationRiskMember"
      id="t_3_8c1a796b_5de1_9cbd_0e3d_71163fd485b3">&lt;div style="margin-top:8pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;font-weight:bold;margin-left:0%"&gt;Valuation Risk: &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt; &#x200a;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;The price the Trust could receive upon the sale of any particular portfolio investment may differ from the Trust&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;&#x2019;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;s valuation of the investment, particularly for &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;securities that trade in thin or volatile markets or that are valued using a fair valuation technique or a price provided by an independent pricing service. Changes to significant &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;unobservable inputs and assumptions (i.e., publicly traded company multiples, growth rate, time to exit) due to the lack of observable inputs may significantly impact the &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;resulting fair value and therefore the Trust&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;&#x2019;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;s results of operations. As a result, the price received upon the sale of an investment may be less than the value ascribed by the &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;Trust, and the Trust could realize a greater than expected loss or lesser than expected gain upon the sale of the investment.&lt;/span&gt;&lt;/div&gt;</cef:RiskTextBlock>
    <cef:RiskTextBlock
      contextRef="Q12026_CounterpartyCreditRiskMember"
      id="t_4_0b06495c_c14f_5c55_94f7_f6c2cf6054ad">&lt;div style="margin-top:8pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;font-weight:bold;margin-left:0%"&gt;Counterparty Credit Risk:&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt;&#x2009;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;The Trust may be exposed to counterparty credit risk, or the risk that an entity may fail to or be unable to perform on its commitments related to &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;unsettled or open transactions, including making timely interest and/or principal payments or otherwise honoring its obligations. The Trust manages counterparty credit risk by &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;entering into transactions only with counterparties that the Manager believes have the financial resources to honor their obligations and by monitoring the financial stability of &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;those counterparties. Financial assets, which potentially expose the Trust to market, issuer and counterparty credit risks, consist principally of financial instruments and &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;receivables due from counterparties. The extent of the Trust&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;&#x2019;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;s exposure to market, issuer and counterparty credit risks with respect to these financial assets is approximately &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;their value recorded in the Statement of Assets and Liabilities, less any collateral held by the Trust.&lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:8pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;A derivative contract may suffer a mark-to-market loss if the value of the contract decreases due to an unfavorable change in the market rates or values of the underlying &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;instrument. Losses can also occur if the counterparty does not perform under the contract.&lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:8pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;With exchange-traded futures, there is less counterparty credit risk to the Trust since the exchange or clearinghouse, as counterparty to such instruments, guarantees against &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;a possible default. The clearinghouse stands between the buyer and the seller of the contract; therefore, credit risk is limited to failure of the clearinghouse. While offset rights &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;may exist under applicable law, the Trust does not have a contractual right of offset against a clearing broker or clearinghouse in the event of a default (including the bankruptcy &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;or insolvency). Additionally, credit risk exists in exchange-traded futures with respect to initial and variation margin that is held in a clearing broker&#x2019;s customer accounts. While &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;clearing brokers are required to segregate customer margin from their own assets, in the event that a clearing broker becomes insolvent or goes into bankruptcy and at that &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;time there is a shortfall in the aggregate amount of margin held by the clearing broker for all its clients, typically the shortfall would be allocated on a pro rata basis across all &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;the clearing broker&#x2019;s customers, potentially resulting in losses to the Trust.&lt;/span&gt;&lt;/div&gt;</cef:RiskTextBlock>
    <cef:RiskTextBlock
      contextRef="Q12026_GeographicAssetClassRiskMember"
      id="t_5_8359938c_fde5_17b3_e4c3_a69bdc05a675">&lt;div style="margin-top:8pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;font-weight:bold;margin-left:0%"&gt;Geographic/Asset Class&#160;Risk:&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt;&#x2009;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;A diversified portfolio, where this is appropriate and consistent with a fund&#x2019;s objectives, minimizes the risk that a price change of a particular &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;investment will have a material impact on the NAV of a fund. The investment concentrations within the&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt;&#x2009;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;Trust&#x2019;s portfolio are disclosed in its Schedule of Investments.&lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:8pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;The&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt;&#x2009;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;Trust&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt;&#x2009;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;invests a significant portion of its assets in securities within a single or limited number of market sectors. When a fund concentrates its investments in this manner, &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;it assumes the risk that economic, regulatory, political and social conditions affecting such sectors may have a significant impact on the Trust and could affect the income from, &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;or the value or liquidity of, the Trust&#x2019;s portfolio. Investment percentages in specific sectors are presented in the Schedule of Investments.&lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:8pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;The&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt;&#x2009;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;Trust invests a significant portion of its assets in fixed-income securities and/or uses derivatives tied to the fixed-income markets. Changes in market interest rates or &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;economic conditions may affect the value and/or liquidity of such investments. Interest rate risk is the risk that prices of bonds and other fixed-income securities will decrease &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;as interest rates rise and increase as interest rates fall. The Trust may be subject to a greater risk of rising interest rates during a period of historically low interest &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;rates.&#160;Changing interest rates may have unpredictable effects on markets, may result in heightened market volatility, and could negatively impact the Trust&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;&#x2019;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;s performance.&lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:8pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;The&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt;&#x2009;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;Trust&#160;invests a significant portion of its assets in securities of issuers located in the United States.&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt;&#x2009;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;A decrease in imports or exports, changes in trade regulations, inflation &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;and/or an economic recession in the United States may have a material adverse effect on the U.S. economy and the securities listed on U.S. exchanges. Proposed and &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;adopted policy and legislative changes in the United States may also have a significant effect on U.S. markets generally, as well as on the value of certain securities. &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;Governmental agencies project that the United States will continue to maintain elevated public debt levels for the foreseeable future which may constrain future economic &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;growth. Circumstances could arise that could prevent the timely payment of interest or principal on U.S. government debt, such as reaching the legislative &#x201c;debt ceiling.&#x201d; Such &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;non-payment would result in substantial negative consequences for the U.S. economy and the global financial system. If U.S. relations with certain countries deteriorate, it &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;could adversely affect issuers that rely on the United States for trade. The United States has also experienced increased internal unrest and discord. If these trends were to &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;continue, they may have an adverse impact on the U.S. economy and the issuers in which the Trust invests.&lt;/span&gt;&lt;/div&gt;</cef:RiskTextBlock>
    <cef:CapitalStockTableTextBlock
      contextRef="Q12026"
      id="t_8_d93fdb62_5bda_136c_439c_c3fc8d20803a">&lt;div style="float:left;line-height:13.50pt;text-align:left;width:13.11pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:11.5pt;font-style:italic;font-weight:bold"&gt;10.&lt;/span&gt;&lt;/div&gt;&lt;div style="float:left;line-height:13.50pt;margin-left:2.89pt;text-align:left;width:538.00pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:11.5pt;font-style:italic;font-weight:bold"&gt;CAPITAL SHARE TRANSACTIONS&#160;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:16.5pt"&gt; &lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:8pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;The Trust is authorized to issue an unlimited number of shares, all of which were initially classified as Common Shares.&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt; &#x200a;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;The par value for the Trust&#x2019;s Common Shares is $0.001.&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt; &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;line-height:11.00pt"&gt;&#x200a;&lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;The Board is authorized, however, to reclassify any unissued Common Shares to Preferred Shares without the approval of Common Shareholders.&lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:8pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;font-weight:bold"&gt;Common Shares&lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:8pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;For the six months ended June 30, 2026, and the year ended December 31, 2025, shares issued and outstanding remained constant.&lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:8pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;BBN has filed a prospectus with the SEC allowing it to issue an additional 21,000,000 Common Shares through an equity Shelf Offering. Under the Shelf Offering, BBN, subject &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;to market conditions, may raise additional equity capital from time to time in varying amounts and utilizing various offering methods at a net price at or above the Trust&#x2019;s NAV &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;per Common Share (calculated within 48 hours of pricing). As of period end, 21,000,000 Common Shares remain available for issuance under the Shelf Offering. During the &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;period ended June 30, 2026, BBN issued 0 shares under the Shelf Offering. See Additional Information - Shelf Offering Program for additional information.&lt;/span&gt;&lt;/div&gt;&lt;div style="margin-top:8pt;"&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;Initial costs incurred by BBN in connection with its Shelf Offering are recorded as &#x201c;Deferred offering costs&#x201d; in the Statement of Assets and Liabilities. As shares are sold, a &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt;margin-left:0%"&gt;portion of the costs attributable to the shares sold will be charged against paid-in-capital. Any remaining deferred charges at the end of the Shelf Offering period will be charged &lt;/span&gt;&lt;span style="color:#000000;font-family:arial narrow;font-size:9pt"&gt;to expense.&lt;/span&gt;&lt;/div&gt;</cef:CapitalStockTableTextBlock>
    <cef:OutstandingSecuritiesTableTextBlock
      contextRef="Q12026"
      id="t_7_20520ae6_6694_2381_5c04_989ac9d5b869">The Trust is authorized to issue an unlimited number of shares, all of which were initially classified as Common Shares.</cef:OutstandingSecuritiesTableTextBlock>
</xbrl>
