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      id="t_1_07bc7037_8bfe_456b_8b8f_cdd772055d6e">This annual shareholder report contains important information about BlackRock Exchange Portfolio (the &#x201c;Fund&#x201d;) for the period of January 1, 2025 to December 31, 2025.</oef:AnnlOrSemiAnnlStatementTextBlock>
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      id="t_3_b07fb635_c04d_46df_9405_b8633e24cfb6">You can find additional information about the Fund at &lt;span style="color: rgb(0, 0, 0); font-weight: bold; text-decoration-line: none; font-family: 'arial'; font-size: 8pt; line-height: 10.4pt; text-align: justify;"&gt;blackrock.com/fundreports&lt;/span&gt;. You can also request this information by contacting us at (800) 441&#x2011;7762.</oef:AddlInfoTextBlock>
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      id="t_6_0d6f3e23_74e0_4ea0_b90e_2de55b0dfe66"> &lt;div style="font-kerning: none; font-family: 'arial'; font-weight: bold; font-size: 8pt; color: rgb(0, 0, 0); margin-bottom: 5pt; margin-top: 5pt;"&gt;This report describes changes to the Fund that occurred during the reporting period.&lt;/div&gt; </oef:MaterialFundChngNoticeTextBlock>
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      id="t_17_2332921e_8dcb_23cf_59c0_3bb357ce48d4"> &lt;div style="margin-top: 0px; font-kerning: none; font-family: 'arial'; font-weight: bold; font-size: 10pt; color: rgb(0, 0, 0); margin-bottom: -0.18pt;"&gt;What were the Fund costs for the last year?&lt;/div&gt;  &lt;div style="margin-top: 0px; margin-bottom: 0px; font-kerning: none; font-family: 'arial'; font-size: 9pt; color: rgb(0, 0, 0);"&gt;(based on a hypothetical $10,000 investment)&lt;/div&gt;
&lt;table style="break-inside: avoid; margin-top: 2pt; table-layout: auto; width: 100%; border-collapse: collapse;"&gt;
&lt;tr style="break-after: avoid; border-bottom-style: solid; border-bottom-width: 0.5pt; break-inside: avoid-page; height: auto; border-bottom-color: rgb(0, 0, 0);"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; font-family: 'Arial'; font-weight: bold; font-size: 9pt; line-height: 11pt; color: rgb(0, 0, 0); background-color: rgb(255, 206, 0); vertical-align: bottom; text-align: left; padding: 2pt 0 2pt 0;"&gt;Class name&lt;/td&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; font-family: 'Arial'; font-weight: bold; font-size: 9pt; line-height: 11pt; color: rgb(0, 0, 0); background-color: rgb(255, 206, 0); text-align: center; vertical-align: bottom; padding: 2pt 0 2pt 0;"&gt;Costs of a $10,000&lt;br/&gt;investment&lt;/td&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; font-family: 'Arial'; font-weight: bold; font-size: 9pt; line-height: 11pt; color: rgb(0, 0, 0); background-color: rgb(255, 206, 0); text-align: center; vertical-align: bottom; padding: 2pt 0 2pt 0;"&gt;Costs paid as a percentage of a &lt;br/&gt;$10,000 investment&lt;/td&gt; &lt;/tr&gt;
&lt;tr style="border-bottom-width: initial; border-bottom-style: none; break-inside: avoid-page; height: auto; border-bottom-color: initial;"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; font-family: 'Arial'; color: rgb(0, 0, 0); overflow-x: hidden; font-size: 8pt; line-height: 10pt; text-align: left; vertical-align: bottom; padding: 4pt 0 2pt 0;"&gt;BlackRock Shares&lt;/td&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: center; font-size: 8pt; line-height: 10pt; vertical-align: bottom; padding: 4pt 0 2pt 0;"&gt;&lt;span style="float: none;"&gt;$&lt;/span&gt;109&lt;/td&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; white-space: nowrap; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: center; font-size: 8pt; line-height: 10pt; vertical-align: bottom; padding: 4pt 0 2pt 0;"&gt;0.99&lt;span&gt;%&lt;/span&gt;&lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; </oef:ExpensesTextBlock>
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    <oef:FactorsAffectingPerfTextBlock
      contextRef="FY2025_C000004917Member"
      id="t_18_ab7800c2_94e2_08d8_70fa_7308d0b902b6"> &lt;div style="margin-bottom: 0px;"&gt; &lt;div style="break-inside: avoid; margin-bottom: 3.5pt;"&gt; &lt;div style="font-kerning: none; font-family: 'arial'; font-weight: bold; font-size: 10pt; color: rgb(0, 0, 0); margin-bottom: -0.18pt; margin-top: 0px;"&gt;How did the Fund perform last year?&lt;/div&gt; &lt;/div&gt; &lt;ul style="break-inside: avoid; padding: 0; margin: 3.5pt 0 3.5pt 0;"&gt; &lt;li style="padding-left: 4pt; font-family: 'Arial'; font-size: 8pt; line-height: 12.32pt; text-align: justify; list-style-type: disc; color: rgb(0, 0, 0); margin-left: 34px;"&gt; &lt;div style="margin-top: 0px; margin-bottom: 0px; font-kerning: none;"&gt;For the reporting period ended December 31, 2025, the Fund's BlackRock Shares returned 19.42%.&lt;/div&gt; &lt;/li&gt; &lt;li style="padding-left: 4pt; font-family: 'Arial'; font-size: 8pt; line-height: 12.32pt; text-align: justify; list-style-type: disc; color: rgb(0, 0, 0); margin-left: 34px;"&gt; &lt;div style="margin-top: 0px; margin-bottom: 0px; font-kerning: none;"&gt;For the same period, the Fund&#x2019;s benchmark, the S&amp;amp;P 500&lt;sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;"&gt;&#xae;&lt;/sup&gt; Index, returned 17.88%.&lt;/div&gt; &lt;/li&gt; &lt;/ul&gt; &lt;div style="break-inside: avoid; margin-bottom: 3.5pt;"&gt; &lt;div style="margin-top: 0px; font-kerning: none; font-family: 'arial'; font-weight: normal; font-size: 10pt; letter-spacing: normal; text-transform: none; color: rgb(0, 0, 0); margin-bottom: 5pt;"&gt;What contributed to performance?&lt;/div&gt; &lt;div style="margin-top: 0px; font-kerning: none; font-family: 'arial'; font-size: 8pt; line-height: 10.4pt; text-align: justify; color: rgb(0, 0, 0); margin-bottom: 3.5pt;"&gt;Investment decisions in the financials, health care and information technology sectors contributed to absolute performance. Holdings in the banking industry proved beneficial in financials, led by JPMorgan Chase &amp;amp; Co. Positioning in pharmaceuticals was most additive in health care, with Johnson &amp;amp; Johnson making the strongest contribution. In information technology, positioning in the software industry contributed due in part to a position in Microsoft Corp.&lt;/div&gt; &lt;/div&gt; &lt;div style="break-inside: avoid; margin-bottom: 3.5pt;"&gt; &lt;div style="margin-top: 0px; font-kerning: none; font-family: 'arial'; font-weight: normal; font-size: 10pt; letter-spacing: normal; text-transform: none; color: rgb(0, 0, 0); margin-bottom: 5pt;"&gt;What detracted from performance?&lt;/div&gt; &lt;div style="margin-top: 0px; font-kerning: none; font-family: 'arial'; font-size: 8pt; line-height: 10.4pt; text-align: justify; color: rgb(0, 0, 0); margin-bottom: 3.5pt;"&gt;There were no sector-level detractors from absolute performance at a time of positive returns for the U.S. equity market, but certain individual holdings hurt results.&lt;/div&gt; &lt;/div&gt; &lt;div style="margin-top: 0px; font-kerning: none; font-family: 'arial'; font-size: 8pt; line-height: 10.4pt; text-align: justify; color: rgb(0, 0, 0); margin-bottom: 3.5pt;"&gt;&lt;i&gt;The views expressed reflect the opinions of BlackRock as of the date of this report and are subject to change based on changes in market, economic or other conditions. These views are not intended to be a forecast of future events and are no guarantee of future results.&lt;/i&gt;&lt;/div&gt; &lt;/div&gt; </oef:FactorsAffectingPerfTextBlock>
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      id="t_29_7f701179_87a4_1d61_5b1f_272b208736fe">&lt;div style="break-inside: avoid;"&gt; &lt;div style="margin-bottom: 5pt;"&gt; &lt;div style="break-inside: avoid;"&gt; &lt;div style="margin-top: 0px; font-kerning: none; font-family: 'arial'; font-weight: bold; font-size: 10pt; color: rgb(0, 0, 0); margin-bottom: -0.18pt;"&gt;Fund performance&lt;/div&gt; &lt;div style="margin-top: 0px; font-kerning: none; font-family: 'arial'; text-align: justify; font-size: 9pt; line-height: 11.4pt; color: rgb(0, 0, 0); margin-bottom: 0px;"&gt;Cumulative performance: January 1, 2016 through December 31, 2025&lt;/div&gt; &lt;/div&gt; &lt;div style="margin-top: 0px; font-kerning: none; font-family: 'arial'; text-align: justify; font-size: 9pt; line-height: 11.4pt; color: rgb(0, 0, 0); margin-bottom: 0px;"&gt;Initial investment of $10,000&lt;/div&gt; &lt;/div&gt; &lt;div style="margin-top: 5pt; margin-bottom: 5pt;"&gt;
&lt;img alt="Fund Performance - Growth of 10K" src="g60011chartimages_11219453.jpg" style="display: block; margin-left: auto; margin-right: auto; width: 525pt;"/&gt; &lt;/div&gt; &lt;div style="padding-left: 10pt; margin-bottom: 7.2pt;"&gt; &lt;div style="margin-top: 0px; font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; text-indent: -10pt; color: rgb(0, 0, 0); margin-bottom: 0px; padding: 0px;"&gt;See &#x201c;Average annual total returns&#x201d; for additional information on fund performance.&lt;/div&gt; &lt;/div&gt; &lt;/div&gt;</oef:LineGraphTableTextBlock>
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      id="t_9_bdc20fae_4620_429c_bc4f_284d6f62ee2e"> &lt;div style="border-bottom-width: 0.5pt; border-bottom-style: solid; font-family: 'arial'; font-weight: bold; font-size: 10pt; text-align: left; letter-spacing: normal; text-transform: none; font-kerning: none; color: rgb(0, 0, 0); background-color: rgb(255, 206, 0); border-bottom-color: rgb(0, 0, 0); margin-top: 0px; margin-bottom: 0px; padding: 2pt 0px 1.5pt 0px;"&gt;Average annual total returns&lt;/div&gt;
&lt;table style="break-inside: avoid; table-layout: auto; width: 100%; border-collapse: collapse; margin-top: 0px;"&gt;
&lt;tr style="border-bottom-width: initial; border-bottom-style: none; break-inside: avoid-page; height: auto; border-bottom-color: initial;"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; text-align: left; overflow-x: hidden; width: 100%; text-indent: -6pt; font-family: 'Arial'; font-weight: normal; font-style: italic; font-size: 8pt; line-height: 10pt; vertical-align: bottom; white-space: nowrap; color: rgb(0, 0, 0); border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"&gt;&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; font-kerning: none; width: auto; font-family: 'Arial'; font-weight: normal; font-style: italic; font-size: 8pt; line-height: 10pt; vertical-align: bottom; white-space: nowrap; color: rgb(0, 0, 0); border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt; padding: 1.6pt 0 0 0;"&gt;1 Year&lt;/td&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; text-align: left; width: auto; font-family: 'Arial'; font-weight: normal; font-style: italic; font-size: 8pt; line-height: 10pt; vertical-align: bottom; white-space: nowrap; color: rgb(0, 0, 0); border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt; padding: 1.6pt 0 0 0;"&gt;&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; font-kerning: none; width: auto; font-family: 'Arial'; font-weight: normal; font-style: italic; font-size: 8pt; line-height: 10pt; vertical-align: bottom; white-space: nowrap; color: rgb(0, 0, 0); border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt; padding: 1.6pt 0 0 0;"&gt;5 Years&lt;/td&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; text-align: left; width: auto; font-family: 'Arial'; font-weight: normal; font-style: italic; font-size: 8pt; line-height: 10pt; vertical-align: bottom; white-space: nowrap; color: rgb(0, 0, 0); border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt; padding: 1.6pt 0 0 0;"&gt;&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; font-kerning: none; width: auto; font-family: 'Arial'; font-weight: normal; font-style: italic; font-size: 8pt; line-height: 10pt; vertical-align: bottom; white-space: nowrap; color: rgb(0, 0, 0); border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt; padding: 1.6pt 0 0 0;"&gt;10 Years&lt;/td&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; text-align: left; width: auto; font-family: 'Arial'; font-weight: normal; font-style: italic; font-size: 8pt; line-height: 10pt; vertical-align: bottom; white-space: nowrap; color: rgb(0, 0, 0); border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt; padding: 1.6pt 0 0 0;"&gt;&lt;/td&gt; &lt;/tr&gt;
&lt;tr style="border-bottom-width: initial; border-bottom-style: none; break-inside: avoid-page; height: auto; border-bottom-color: initial;"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; text-align: left; color: rgb(0, 0, 0); overflow-x: hidden; font-family: 'Arial'; width: 100%; vertical-align: bottom; text-indent: -6pt; font-size: 8pt; line-height: 10pt; padding: 2pt 0 0 6pt;"&gt;BlackRock Shares&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: bottom; font-kerning: none; font-family: 'Arial'; color: rgb(0, 0, 0); width: auto; font-size: 8pt; line-height: 10pt; padding: 2pt 0 0 0;"&gt;19.42&lt;/td&gt;
&lt;td style="break-inside: avoid-page; vertical-align: bottom; font-kerning: none; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: left; white-space: nowrap; width: auto; font-size: 8pt; line-height: 10pt; padding: 1.6pt 6pt 0 0;"&gt;&lt;span style="display: inline; visibility: initial; margin-left: initial;"&gt;%&lt;/span&gt;&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: bottom; font-kerning: none; font-family: 'Arial'; color: rgb(0, 0, 0); width: auto; font-size: 8pt; line-height: 10pt; padding: 2pt 0 0 0;"&gt;15.69&lt;/td&gt;
&lt;td style="break-inside: avoid-page; vertical-align: bottom; font-kerning: none; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: left; white-space: nowrap; width: auto; font-size: 8pt; line-height: 10pt; padding: 1.6pt 6pt 0 0;"&gt;&lt;span style="display: inline; visibility: initial; margin-left: initial;"&gt;%&lt;/span&gt;&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: bottom; font-kerning: none; font-family: 'Arial'; color: rgb(0, 0, 0); width: auto; font-size: 8pt; line-height: 10pt; padding: 2pt 0 0 0;"&gt;14.00&lt;/td&gt;
&lt;td style="break-inside: avoid-page; vertical-align: bottom; font-kerning: none; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: left; white-space: nowrap; width: auto; font-size: 8pt; line-height: 10pt; padding: 1.6pt 0 0 0;"&gt;&lt;span style="display: inline; visibility: initial; margin-left: initial;"&gt;%&lt;/span&gt;&lt;/td&gt; &lt;/tr&gt;
&lt;tr style="border-bottom-width: 0.5pt; border-bottom-style: solid; break-inside: avoid-page; height: auto; border-bottom-color: rgb(0, 0, 0);"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; text-align: left; color: rgb(0, 0, 0); overflow-x: hidden; font-family: 'Arial'; width: 100%; vertical-align: bottom; text-indent: -6pt; font-size: 8pt; line-height: 10pt; padding: 2pt 0 1.6pt 6pt;"&gt;S&amp;amp;P 500&lt;sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;"&gt;&#xae;&lt;/sup&gt; Index&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: bottom; font-kerning: none; font-family: 'Arial'; color: rgb(0, 0, 0); width: auto; font-size: 8pt; line-height: 10pt; padding: 2pt 0 1.6pt 0;"&gt;17.88&lt;/td&gt;
&lt;td style="break-inside: avoid-page; vertical-align: bottom; font-kerning: none; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: left; white-space: nowrap; width: auto; font-size: 8pt; line-height: 10pt; padding: 1.6pt 6pt 1.6pt 0;"&gt;&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: bottom; font-kerning: none; font-family: 'Arial'; color: rgb(0, 0, 0); width: auto; font-size: 8pt; line-height: 10pt; padding: 2pt 0 1.6pt 0;"&gt;14.42&lt;/td&gt;
&lt;td style="break-inside: avoid-page; vertical-align: bottom; font-kerning: none; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: left; white-space: nowrap; width: auto; font-size: 8pt; line-height: 10pt; padding: 1.6pt 6pt 1.6pt 0;"&gt;&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: bottom; font-kerning: none; font-family: 'Arial'; color: rgb(0, 0, 0); width: auto; font-size: 8pt; line-height: 10pt; padding: 2pt 0 1.6pt 0;"&gt;14.82&lt;/td&gt;
&lt;td style="break-inside: avoid-page; vertical-align: bottom; font-kerning: none; font-family: 'Arial'; color: rgb(0, 0, 0); text-align: left; white-space: nowrap; width: auto; font-size: 8pt; line-height: 10pt; padding: 1.6pt 0 1.6pt 0;"&gt;&lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; </oef:AvgAnnlRtrTableTextBlock>
    <oef:LineGraphAndTableMeasureName
      contextRef="FY2025_C000004917Member"
      id="t_27_f3cefc00_3082_635a_9f77_9ebf6ff60e8f">BlackRock Shares</oef:LineGraphAndTableMeasureName>
    <oef:AvgAnnlRtrPct
      contextRef="FY2025_C000004917Member"
      decimals="4"
      id="h_3_0d1cd851_7c0e_4399_b6e6_2bdabc07b89a"
      unitRef="pure">0.1942</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="FiveY2025_C000004917Member"
      decimals="4"
      id="h_4_e1632480_643f_47fd_8f78_73cd4404e9ae"
      unitRef="pure">0.1569</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="TenY2025_C000004917Member"
      decimals="4"
      id="h_5_32c633a0_5eea_43e7_a56a_ff376f35e89e"
      unitRef="pure">0.1400</oef:AvgAnnlRtrPct>
    <oef:LineGraphAndTableMeasureName
      contextRef="FY2025_StandardPoors500IndexMember"
      id="t_28_10f0267b_036a_55bc_bc7a_ffe14d8d87db">S&amp;P 500&#xae; Index</oef:LineGraphAndTableMeasureName>
    <oef:AvgAnnlRtrPct
      contextRef="FY2025_StandardPoors500IndexMember"
      decimals="4"
      id="h_6_eff96170_1433_4bdd_a80a_3ba941fb8cf2"
      unitRef="pure">0.1788</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="FiveY2025_StandardPoors500IndexMember"
      decimals="4"
      id="h_7_10bc6e62_102d_41aa_984c_8169c269b1bb"
      unitRef="pure">0.1442</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="TenY2025_StandardPoors500IndexMember"
      decimals="4"
      id="h_8_9710d1ce_2894_4a7e_8bb3_3945e4299633"
      unitRef="pure">0.1482</oef:AvgAnnlRtrPct>
    <oef:AddlFundStatisticsTextBlock
      contextRef="FY2025_C000004917Member"
      id="t_19_3895e1a6_72b9_50f9_9a3b_eb6c698a62af"> &lt;div style="border-bottom-width: 0.5pt; border-bottom-style: solid; font-family: 'arial'; font-weight: bold; font-size: 10pt; text-align: left; letter-spacing: normal; text-transform: none; font-kerning: none; color: rgb(0, 0, 0); background-color: rgb(255, 206, 0); border-bottom-color: rgb(0, 0, 0); margin-top: 0px; margin-bottom: 0px; padding: 2pt 0px 1.5pt 0px;"&gt;Key Fund statistics&lt;/div&gt;
&lt;table style="break-inside: avoid; table-layout: auto; width: 100%; border-collapse: collapse; margin-top: 0px;"&gt;
&lt;tr style="border-bottom-width: initial; border-bottom-style: none; break-inside: avoid-page; height: auto; border-bottom-color: initial;"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; color: rgb(0, 0, 0); overflow-x: hidden; font-family: 'Arial'; font-size: 8pt; line-height: 10pt; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 6pt 0 6pt;"&gt;Net Assets&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; font-kerning: none; white-space: nowrap; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 8pt; line-height: 10pt; width: 12%; vertical-align: bottom; padding: 1.6pt 6pt 0 6pt;"&gt;&lt;span style="float: none;"&gt;$&lt;/span&gt;276,253,482&lt;/td&gt; &lt;/tr&gt;
&lt;tr style="border-bottom-width: initial; border-bottom-style: none; break-inside: avoid-page; height: auto; border-bottom-color: initial;"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; color: rgb(0, 0, 0); overflow-x: hidden; font-family: 'Arial'; font-size: 8pt; line-height: 10pt; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 6pt 0 6pt;"&gt;Number of Portfolio Holdings&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; font-kerning: none; white-space: nowrap; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 8pt; line-height: 10pt; width: 12%; vertical-align: bottom; padding: 1.6pt 6pt 0 6pt;"&gt;25&lt;/td&gt; &lt;/tr&gt;
&lt;tr style="border-bottom-width: initial; border-bottom-style: none; break-inside: avoid-page; height: auto; border-bottom-color: initial;"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; color: rgb(0, 0, 0); overflow-x: hidden; font-family: 'Arial'; font-size: 8pt; line-height: 10pt; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 6pt 0 6pt;"&gt;Net Investment Advisory Fees&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; font-kerning: none; white-space: nowrap; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 8pt; line-height: 10pt; width: 12%; vertical-align: bottom; padding: 1.6pt 6pt 0 6pt;"&gt;&lt;span style="float: none;"&gt;$&lt;/span&gt;1,343,074&lt;/td&gt; &lt;/tr&gt;
&lt;tr style="border-bottom-width: 0.5pt; border-bottom-style: solid; break-inside: avoid-page; height: auto; border-bottom-color: rgb(0, 0, 0);"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; color: rgb(0, 0, 0); overflow-x: hidden; font-family: 'Arial'; font-size: 8pt; line-height: 10pt; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 6pt 1.6pt 6pt;"&gt;Portfolio Turnover Rate&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; font-kerning: none; white-space: nowrap; font-family: 'Arial'; color: rgb(0, 0, 0); font-size: 8pt; line-height: 10pt; width: 12%; vertical-align: bottom; padding: 1.6pt 6pt 1.6pt 6pt;"&gt;&lt;span class="sec-hidden" style="-sec-ix-hidden: h_30_574e3fc2_af77_cef1_7f3c_fffa994e0269;"&gt;&#x2014;&lt;/span&gt;&lt;span&gt;%&lt;/span&gt;&lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; </oef:AddlFundStatisticsTextBlock>
    <us-gaap:AssetsNet
      contextRef="TI20251231_C000004917Member"
      decimals="INF"
      id="h_9_f88e46ef_87a6_47ec_9723_e98a3ea07a28"
      unitRef="USD">276253482</us-gaap:AssetsNet>
    <oef:HoldingsCount
      contextRef="TI20251231_C000004917Member"
      decimals="INF"
      id="h_10_c3029062_0032_4516_bba9_c96a6de18d1b"
      unitRef="Holding">25</oef:HoldingsCount>
    <oef:AdvisoryFeesPaidAmt
      contextRef="FY2025_C000004917Member"
      decimals="INF"
      id="h_11_bb34c67a_20a2_40bb_9533_c8f027a10dda"
      unitRef="USD">1343074</oef:AdvisoryFeesPaidAmt>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="FY2025_C000004917Member"
      id="t_20_6af75f6f_2e32_844f_44df_ef351be08298">Past performance is not an indication of future results.</oef:PerformancePastDoesNotIndicateFuture>
    <oef:NoDeductionOfTaxesTextBlock
      contextRef="FY2025_C000004917Member"
      id="t_21_86b7e03d_fde6_a933_49da_e185fbd11fd5">Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or on the redemption or sale of fund shares.</oef:NoDeductionOfTaxesTextBlock>
    <oef:UpdPerfInfoLocationTextBlock
      contextRef="FY2025_C000004917Member"
      id="t_22_5d4b01c7_f09b_7f79_3d98_80489b942c0c">Visit &lt;span style="color: rgb(0, 0, 0); font-weight: bold; text-decoration-line: none; font-family: 'arial'; font-size: 8pt; line-height: 10.4pt; text-align: justify;"&gt;blackrock.com&lt;/span&gt; for more recent performance information.</oef:UpdPerfInfoLocationTextBlock>
    <oef:HoldingsTableTextBlock
      contextRef="FY2025_C000004917Member"
      id="t_11_14026cb4_51c0_4988_ad39_95c8ea36e3be"> &lt;div style="margin-top: 0px; font-kerning: none; font-family: 'arial'; font-weight: bold; font-size: 10pt; color: rgb(0, 0, 0); margin-bottom: -0.18pt;"&gt;What did the Fund invest in?&lt;/div&gt;  &lt;div style="margin-top: 0px; font-kerning: none; font-family: 'arial'; text-align: justify; font-size: 9pt; line-height: 11.4pt; color: rgb(0, 0, 0); margin-bottom: 0px;"&gt;(as of December 31, 2025)&lt;/div&gt;  &lt;div style="border-bottom-width: 0.5pt; border-bottom-style: solid; font-family: 'arial'; font-weight: bold; font-size: 10pt; text-align: left; letter-spacing: normal; text-transform: none; font-kerning: none; color: rgb(0, 0, 0); background-color: rgb(255, 206, 0); border-bottom-color: rgb(0, 0, 0); margin-top: 0px; margin-bottom: 0px; padding: 2pt 0px 1.5pt 0px;"&gt;&lt;b&gt;Sector allocation&lt;/b&gt;&lt;/div&gt;
&lt;table style="break-inside: avoid; table-layout: auto; width: 100%; border-collapse: collapse; margin-top: 0px;"&gt;
&lt;tr style="break-after: avoid; border-bottom-style: solid; border-bottom-width: 0.5pt; break-inside: avoid-page; height: auto; font-family: 'arial'; font-style: italic; font-size: 8pt; line-height: 10pt; border-bottom-color: rgb(0, 0, 0);"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; white-space: nowrap; font-weight: normal; text-align: left; vertical-align: bottom; text-indent: -6pt; width: auto; padding: 1.6pt 0 0 6pt;"&gt;&lt;em&gt;Sector&lt;sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;"&gt;(a)&lt;/sup&gt;&lt;/em&gt;&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; font-kerning: none; white-space: nowrap; vertical-align: bottom; padding: 1.6pt 0 0 6pt;"&gt;&lt;em&gt;Percent of&lt;br/&gt;Net Assets&lt;/em&gt;&lt;/td&gt;
&lt;td style="width: auto; break-inside: avoid-page; font-kerning: none; text-align: left; white-space: nowrap; vertical-align: bottom; padding: 1.6pt 0 0 6pt;"&gt;&lt;/td&gt; &lt;/tr&gt;
&lt;tr style="border-bottom-width: initial; border-bottom-style: none; break-inside: avoid-page; height: auto; font-family: 'arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial;"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; color: rgb(0, 0, 0); overflow-x: hidden; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;"&gt;Financials&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: bottom; font-kerning: none; width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;"&gt;33.3&lt;/td&gt;
&lt;td style="break-inside: avoid-page; vertical-align: bottom; font-kerning: none; text-align: left; white-space: nowrap; width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"&gt;&lt;span&gt;%&lt;/span&gt;&lt;/td&gt; &lt;/tr&gt;
&lt;tr style="border-bottom-width: initial; border-bottom-style: none; break-inside: avoid-page; height: auto; font-family: 'arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial;"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; color: rgb(0, 0, 0); overflow-x: hidden; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;"&gt;Information Technology&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: bottom; font-kerning: none; width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;"&gt;28.6&lt;/td&gt;
&lt;td style="break-inside: avoid-page; vertical-align: bottom; font-kerning: none; text-align: left; white-space: nowrap; width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"&gt;&lt;span style="visibility: hidden; margin-left: -7pt;"&gt;%&lt;/span&gt;&lt;/td&gt; &lt;/tr&gt;
&lt;tr style="border-bottom-width: initial; border-bottom-style: none; break-inside: avoid-page; height: auto; font-family: 'arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial;"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; color: rgb(0, 0, 0); overflow-x: hidden; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;"&gt;Health Care&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: bottom; font-kerning: none; width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;"&gt;16.0&lt;/td&gt;
&lt;td style="break-inside: avoid-page; vertical-align: bottom; font-kerning: none; text-align: left; white-space: nowrap; width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"&gt;&lt;span style="visibility: hidden; margin-left: -7pt;"&gt;%&lt;/span&gt;&lt;/td&gt; &lt;/tr&gt;
&lt;tr style="border-bottom-width: initial; border-bottom-style: none; break-inside: avoid-page; height: auto; font-family: 'arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial;"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; color: rgb(0, 0, 0); overflow-x: hidden; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;"&gt;Industrials&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: bottom; font-kerning: none; width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;"&gt;9.5&lt;/td&gt;
&lt;td style="break-inside: avoid-page; vertical-align: bottom; font-kerning: none; text-align: left; white-space: nowrap; width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"&gt;&lt;span style="visibility: hidden; margin-left: -7pt;"&gt;%&lt;/span&gt;&lt;/td&gt; &lt;/tr&gt;
&lt;tr style="border-bottom-width: initial; border-bottom-style: none; break-inside: avoid-page; height: auto; font-family: 'arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial;"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; color: rgb(0, 0, 0); overflow-x: hidden; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;"&gt;Consumer Staples&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: bottom; font-kerning: none; width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;"&gt;8.9&lt;/td&gt;
&lt;td style="break-inside: avoid-page; vertical-align: bottom; font-kerning: none; text-align: left; white-space: nowrap; width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"&gt;&lt;span style="visibility: hidden; margin-left: -7pt;"&gt;%&lt;/span&gt;&lt;/td&gt; &lt;/tr&gt;
&lt;tr style="border-bottom-width: initial; border-bottom-style: none; break-inside: avoid-page; height: auto; font-family: 'arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial;"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; color: rgb(0, 0, 0); overflow-x: hidden; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;"&gt;Energy&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: bottom; font-kerning: none; width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;"&gt;3.8&lt;/td&gt;
&lt;td style="break-inside: avoid-page; vertical-align: bottom; font-kerning: none; text-align: left; white-space: nowrap; width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"&gt;&lt;span style="visibility: hidden; margin-left: -7pt;"&gt;%&lt;/span&gt;&lt;/td&gt; &lt;/tr&gt;
&lt;tr style="border-bottom-width: initial; border-bottom-style: none; break-inside: avoid-page; height: auto; font-family: 'arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial;"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; color: rgb(0, 0, 0); overflow-x: hidden; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;"&gt;Short-Term Securities&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: bottom; font-kerning: none; width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;"&gt;0.2&lt;/td&gt;
&lt;td style="break-inside: avoid-page; vertical-align: bottom; font-kerning: none; text-align: left; white-space: nowrap; width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"&gt;&lt;span style="visibility: hidden; margin-left: -7pt;"&gt;%&lt;/span&gt;&lt;/td&gt; &lt;/tr&gt;
&lt;tr style="border-bottom-width: 0.5pt; border-bottom-style: solid; break-inside: avoid-page; height: auto; font-family: 'arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: rgb(0, 0, 0);"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; color: rgb(0, 0, 0); overflow-x: hidden; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 1.6pt 6pt;"&gt;Liabilities in Excess of Other Assets&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: bottom; font-kerning: none; width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 1.6pt 0;"&gt;(0.3&lt;/td&gt;
&lt;td style="break-inside: avoid-page; vertical-align: bottom; font-kerning: none; text-align: left; white-space: nowrap; width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 1.6pt 0;"&gt;&lt;span&gt;)&lt;/span&gt;&lt;span style="visibility: hidden; margin-left: -7pt;"&gt;%&lt;/span&gt;&lt;/td&gt; &lt;/tr&gt; &lt;/table&gt;   &lt;div style="border-bottom-width: 0.5pt; border-bottom-style: solid; font-family: 'arial'; font-weight: bold; font-size: 10pt; text-align: left; letter-spacing: normal; text-transform: none; font-kerning: none; color: rgb(0, 0, 0); background-color: rgb(255, 206, 0); border-bottom-color: rgb(0, 0, 0); margin-top: 0px; margin-bottom: 0px; padding: 2pt 0px 1.5pt 0px;"&gt;&lt;b&gt;Ten largest holdings&lt;/b&gt;&lt;/div&gt;
&lt;table style="break-inside: avoid; table-layout: auto; width: 100%; border-collapse: collapse; margin-top: 0px;"&gt;
&lt;tr style="break-after: avoid; border-bottom-style: solid; border-bottom-width: 0.5pt; break-inside: avoid-page; height: auto; font-family: 'arial'; font-style: italic; font-size: 8pt; line-height: 10pt; border-bottom-color: rgb(0, 0, 0);"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; white-space: nowrap; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;"&gt;&lt;em&gt;Security&lt;sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;"&gt;(b)&lt;/sup&gt;&lt;/em&gt;&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; font-kerning: none; white-space: nowrap; vertical-align: bottom; padding: 1.6pt 0 0 0;"&gt;&lt;em&gt;Percent of&lt;br/&gt;Net Assets&lt;/em&gt;&lt;/td&gt;
&lt;td style="width: auto; break-inside: avoid-page; font-kerning: none; text-align: left; white-space: nowrap; vertical-align: bottom; padding: 1.6pt 0 0 0;"&gt;&lt;/td&gt; &lt;/tr&gt;
&lt;tr style="border-bottom-width: initial; border-bottom-style: none; break-inside: avoid-page; height: auto; font-family: 'arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial;"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; color: rgb(0, 0, 0); overflow-x: hidden; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;"&gt;Microsoft Corp.&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;"&gt;27.5&lt;/td&gt;
&lt;td style="break-inside: avoid-page; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); text-align: left; white-space: nowrap; width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"&gt;&lt;span&gt;%&lt;/span&gt;&lt;/td&gt; &lt;/tr&gt;
&lt;tr style="border-bottom-width: initial; border-bottom-style: none; break-inside: avoid-page; height: auto; font-family: 'arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial;"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; color: rgb(0, 0, 0); overflow-x: hidden; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;"&gt;Berkshire Hathaway, Inc., Class B&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;"&gt;10.1&lt;/td&gt;
&lt;td style="break-inside: avoid-page; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); text-align: left; white-space: nowrap; width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"&gt;&lt;span style="visibility: hidden; margin-left: -7pt;"&gt;%&lt;/span&gt;&lt;/td&gt; &lt;/tr&gt;
&lt;tr style="border-bottom-width: initial; border-bottom-style: none; break-inside: avoid-page; height: auto; font-family: 'arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial;"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; color: rgb(0, 0, 0); overflow-x: hidden; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;"&gt;JPMorgan Chase &amp;amp; Co.&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;"&gt;10.0&lt;/td&gt;
&lt;td style="break-inside: avoid-page; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); text-align: left; white-space: nowrap; width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"&gt;&lt;span style="visibility: hidden; margin-left: -7pt;"&gt;%&lt;/span&gt;&lt;/td&gt; &lt;/tr&gt;
&lt;tr style="border-bottom-width: initial; border-bottom-style: none; break-inside: avoid-page; height: auto; font-family: 'arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial;"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; color: rgb(0, 0, 0); overflow-x: hidden; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;"&gt;General Dynamics Corp.&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;"&gt;9.5&lt;/td&gt;
&lt;td style="break-inside: avoid-page; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); text-align: left; white-space: nowrap; width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"&gt;&lt;span style="visibility: hidden; margin-left: -7pt;"&gt;%&lt;/span&gt;&lt;/td&gt; &lt;/tr&gt;
&lt;tr style="border-bottom-width: initial; border-bottom-style: none; break-inside: avoid-page; height: auto; font-family: 'arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial;"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; color: rgb(0, 0, 0); overflow-x: hidden; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;"&gt;American Express Co.&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;"&gt;8.2&lt;/td&gt;
&lt;td style="break-inside: avoid-page; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); text-align: left; white-space: nowrap; width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"&gt;&lt;span style="visibility: hidden; margin-left: -7pt;"&gt;%&lt;/span&gt;&lt;/td&gt; &lt;/tr&gt;
&lt;tr style="border-bottom-width: initial; border-bottom-style: none; break-inside: avoid-page; height: auto; font-family: 'arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial;"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; color: rgb(0, 0, 0); overflow-x: hidden; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;"&gt;Visa, Inc., Class A&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;"&gt;5.0&lt;/td&gt;
&lt;td style="break-inside: avoid-page; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); text-align: left; white-space: nowrap; width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"&gt;&lt;span style="visibility: hidden; margin-left: -7pt;"&gt;%&lt;/span&gt;&lt;/td&gt; &lt;/tr&gt;
&lt;tr style="border-bottom-width: initial; border-bottom-style: none; break-inside: avoid-page; height: auto; font-family: 'arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial;"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; color: rgb(0, 0, 0); overflow-x: hidden; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;"&gt;AstraZeneca PLC, ADR&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;"&gt;4.3&lt;/td&gt;
&lt;td style="break-inside: avoid-page; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); text-align: left; white-space: nowrap; width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"&gt;&lt;span style="visibility: hidden; margin-left: -7pt;"&gt;%&lt;/span&gt;&lt;/td&gt; &lt;/tr&gt;
&lt;tr style="border-bottom-width: initial; border-bottom-style: none; break-inside: avoid-page; height: auto; font-family: 'arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial;"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; color: rgb(0, 0, 0); overflow-x: hidden; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;"&gt;Johnson &amp;amp; Johnson&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;"&gt;4.2&lt;/td&gt;
&lt;td style="break-inside: avoid-page; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); text-align: left; white-space: nowrap; width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"&gt;&lt;span style="visibility: hidden; margin-left: -7pt;"&gt;%&lt;/span&gt;&lt;/td&gt; &lt;/tr&gt;
&lt;tr style="border-bottom-width: initial; border-bottom-style: none; break-inside: avoid-page; height: auto; font-family: 'arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial;"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; color: rgb(0, 0, 0); overflow-x: hidden; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;"&gt;Novartis AG, ADR&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;"&gt;3.4&lt;/td&gt;
&lt;td style="break-inside: avoid-page; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); text-align: left; white-space: nowrap; width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"&gt;&lt;span style="visibility: hidden; margin-left: -7pt;"&gt;%&lt;/span&gt;&lt;/td&gt; &lt;/tr&gt;
&lt;tr style="border-bottom-width: 0.5pt; border-bottom-style: solid; break-inside: avoid-page; height: auto; font-family: 'arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: rgb(0, 0, 0);"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; color: rgb(0, 0, 0); overflow-x: hidden; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 1.6pt 6pt;"&gt;Walmart, Inc.&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 1.6pt 0;"&gt;3.3&lt;/td&gt;
&lt;td style="break-inside: avoid-page; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); text-align: left; white-space: nowrap; width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 1.6pt 0;"&gt;&lt;span style="visibility: hidden; margin-left: -7pt;"&gt;%&lt;/span&gt;&lt;/td&gt; &lt;/tr&gt; &lt;/table&gt;
&lt;table style="border-collapse: collapse; break-inside: avoid; width: 100%; margin-top: 0px;"&gt;
&lt;tr style="border-bottom-width: initial; border-bottom-style: none; break-inside: avoid-page; height: auto; border-bottom-color: initial;"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; overflow-x: hidden; font-family: 'Arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; width: initial; text-indent: 0; color: rgb(0, 0, 0); padding: 1.6pt 6pt 0 0;"&gt; &lt;div style="margin-top: 0px; font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; color: rgb(0, 0, 0); margin-bottom: 0px; padding: 0px;"&gt;&#x200b;&lt;sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;"&gt;(a)&lt;/sup&gt;&lt;/div&gt; &lt;/td&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; font-family: 'Arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; text-indent: 0; color: rgb(0, 0, 0); width: 100%; padding: 1.6pt 0 0 0;"&gt; &lt;div style="margin-top: 0px; font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; color: rgb(0, 0, 0); margin-bottom: 0px; padding: 0px;"&gt;For purposes of this report, sector sub-classifications may differ from those utilized by the Fund for compliance purposes.&lt;/div&gt; &lt;/td&gt; &lt;/tr&gt;
&lt;tr style="border-bottom-width: initial; border-bottom-style: none; break-inside: avoid-page; height: auto; border-bottom-color: initial;"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; overflow-x: hidden; font-family: 'Arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; color: rgb(0, 0, 0); width: initial; vertical-align: top; text-indent: 0; padding: 0 6pt 0 0;"&gt; &lt;div style="margin-top: 0px; font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; color: rgb(0, 0, 0); margin-bottom: 0px; padding: 0px;"&gt;&#x200b;&lt;sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;"&gt;(b)&lt;/sup&gt;&lt;/div&gt; &lt;/td&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; font-family: 'Arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; color: rgb(0, 0, 0); width: 100%; padding: 0;"&gt; &lt;div style="margin-top: 0px; font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; color: rgb(0, 0, 0); margin-bottom: 0px; padding: 0px;"&gt;Excludes short-term securities.&lt;/div&gt; &lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; </oef:HoldingsTableTextBlock>
    <oef:PctOfNav
      contextRef="TI20251231_C000004917Member_FinancialServicesSectorMember"
      decimals="4"
      id="h_12_9cec9265_2165_4dd6_aa2b_49e84b8c740a"
      unitRef="pure">0.333</oef:PctOfNav>
    <oef:PctOfNav
      contextRef="TI20251231_C000004917Member_InformationTechnologySectorMember"
      decimals="4"
      id="h_13_9b2e7c9e_483b_4c07_9ac2_8223b643ab14"
      unitRef="pure">0.286</oef:PctOfNav>
    <oef:PctOfNav
      contextRef="TI20251231_C000004917Member_HealthcareSectorMember"
      decimals="4"
      id="h_14_7f60c7d8_0d16_4e41_bee1_34d96fc3dd36"
      unitRef="pure">0.160</oef:PctOfNav>
    <oef:PctOfNav
      contextRef="TI20251231_C000004917Member_IndustrialSectorMember"
      decimals="4"
      id="h_15_b4d1bc96_9a44_456c_996a_a626e28180a5"
      unitRef="pure">0.095</oef:PctOfNav>
    <oef:PctOfNav
      contextRef="TI20251231_C000004917Member_ConsumerStaplesSectorMember"
      decimals="4"
      id="h_16_cee5ada7_2712_4605_9b4a_21fd8a1a0b81"
      unitRef="pure">0.089</oef:PctOfNav>
    <oef:PctOfNav
      contextRef="TI20251231_C000004917Member_EnergySectorMember"
      decimals="4"
      id="h_17_dfcb2fa2_c23d_4fd2_8096_ed5045e226ba"
      unitRef="pure">0.038</oef:PctOfNav>
    <oef:PctOfNav
      contextRef="TI20251231_C000004917Member_ShortTermInvestmentsMember"
      decimals="4"
      id="h_18_23ef2679_7d46_4c1a_90d3_7bd1b11e69f0"
      unitRef="pure">0.002</oef:PctOfNav>
    <oef:PctOfNav
      contextRef="TI20251231_C000004917Member_LiabilitiesInExcessOfOtherAssetsMember"
      decimals="4"
      id="h_19_7185c56b_079c_4811_aa21_5a72ea5ebd0d"
      unitRef="pure">-0.003</oef:PctOfNav>
    <oef:LargestHoldingsTableTextBlock
      contextRef="FY2025_C000004917Member"
      id="t_23_c1614be2_1204_6b61_b9d9_75c469f33e60"> &lt;div style="border-bottom-width: 0.5pt; border-bottom-style: solid; font-family: 'arial'; font-weight: bold; font-size: 10pt; text-align: left; letter-spacing: normal; text-transform: none; font-kerning: none; color: rgb(0, 0, 0); background-color: rgb(255, 206, 0); border-bottom-color: rgb(0, 0, 0); margin-top: 0px; margin-bottom: 0px; padding: 2pt 0px 1.5pt 0px;"&gt;&lt;b&gt;Ten largest holdings&lt;/b&gt;&lt;/div&gt;
&lt;table style="break-inside: avoid; table-layout: auto; width: 100%; border-collapse: collapse; margin-top: 0px;"&gt;
&lt;tr style="break-after: avoid; border-bottom-style: solid; border-bottom-width: 0.5pt; break-inside: avoid-page; height: auto; font-family: 'arial'; font-style: italic; font-size: 8pt; line-height: 10pt; border-bottom-color: rgb(0, 0, 0);"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; white-space: nowrap; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;"&gt;&lt;em&gt;Security&lt;sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;"&gt;(b)&lt;/sup&gt;&lt;/em&gt;&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; font-kerning: none; white-space: nowrap; vertical-align: bottom; padding: 1.6pt 0 0 0;"&gt;&lt;em&gt;Percent of&lt;br/&gt;Net Assets&lt;/em&gt;&lt;/td&gt;
&lt;td style="width: auto; break-inside: avoid-page; font-kerning: none; text-align: left; white-space: nowrap; vertical-align: bottom; padding: 1.6pt 0 0 0;"&gt;&lt;/td&gt; &lt;/tr&gt;
&lt;tr style="border-bottom-width: initial; border-bottom-style: none; break-inside: avoid-page; height: auto; font-family: 'arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial;"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; color: rgb(0, 0, 0); overflow-x: hidden; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;"&gt;Microsoft Corp.&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;"&gt;27.5&lt;/td&gt;
&lt;td style="break-inside: avoid-page; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); text-align: left; white-space: nowrap; width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"&gt;&lt;span&gt;%&lt;/span&gt;&lt;/td&gt; &lt;/tr&gt;
&lt;tr style="border-bottom-width: initial; border-bottom-style: none; break-inside: avoid-page; height: auto; font-family: 'arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial;"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; color: rgb(0, 0, 0); overflow-x: hidden; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;"&gt;Berkshire Hathaway, Inc., Class B&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;"&gt;10.1&lt;/td&gt;
&lt;td style="break-inside: avoid-page; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); text-align: left; white-space: nowrap; width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"&gt;&lt;span style="visibility: hidden; margin-left: -7pt;"&gt;%&lt;/span&gt;&lt;/td&gt; &lt;/tr&gt;
&lt;tr style="border-bottom-width: initial; border-bottom-style: none; break-inside: avoid-page; height: auto; font-family: 'arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial;"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; color: rgb(0, 0, 0); overflow-x: hidden; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;"&gt;JPMorgan Chase &amp;amp; Co.&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;"&gt;10.0&lt;/td&gt;
&lt;td style="break-inside: avoid-page; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); text-align: left; white-space: nowrap; width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"&gt;&lt;span style="visibility: hidden; margin-left: -7pt;"&gt;%&lt;/span&gt;&lt;/td&gt; &lt;/tr&gt;
&lt;tr style="border-bottom-width: initial; border-bottom-style: none; break-inside: avoid-page; height: auto; font-family: 'arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial;"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; color: rgb(0, 0, 0); overflow-x: hidden; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;"&gt;General Dynamics Corp.&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;"&gt;9.5&lt;/td&gt;
&lt;td style="break-inside: avoid-page; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); text-align: left; white-space: nowrap; width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"&gt;&lt;span style="visibility: hidden; margin-left: -7pt;"&gt;%&lt;/span&gt;&lt;/td&gt; &lt;/tr&gt;
&lt;tr style="border-bottom-width: initial; border-bottom-style: none; break-inside: avoid-page; height: auto; font-family: 'arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial;"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; color: rgb(0, 0, 0); overflow-x: hidden; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;"&gt;American Express Co.&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;"&gt;8.2&lt;/td&gt;
&lt;td style="break-inside: avoid-page; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); text-align: left; white-space: nowrap; width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"&gt;&lt;span style="visibility: hidden; margin-left: -7pt;"&gt;%&lt;/span&gt;&lt;/td&gt; &lt;/tr&gt;
&lt;tr style="border-bottom-width: initial; border-bottom-style: none; break-inside: avoid-page; height: auto; font-family: 'arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial;"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; color: rgb(0, 0, 0); overflow-x: hidden; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;"&gt;Visa, Inc., Class A&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;"&gt;5.0&lt;/td&gt;
&lt;td style="break-inside: avoid-page; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); text-align: left; white-space: nowrap; width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"&gt;&lt;span style="visibility: hidden; margin-left: -7pt;"&gt;%&lt;/span&gt;&lt;/td&gt; &lt;/tr&gt;
&lt;tr style="border-bottom-width: initial; border-bottom-style: none; break-inside: avoid-page; height: auto; font-family: 'arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial;"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; color: rgb(0, 0, 0); overflow-x: hidden; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;"&gt;AstraZeneca PLC, ADR&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;"&gt;4.3&lt;/td&gt;
&lt;td style="break-inside: avoid-page; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); text-align: left; white-space: nowrap; width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"&gt;&lt;span style="visibility: hidden; margin-left: -7pt;"&gt;%&lt;/span&gt;&lt;/td&gt; &lt;/tr&gt;
&lt;tr style="border-bottom-width: initial; border-bottom-style: none; break-inside: avoid-page; height: auto; font-family: 'arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial;"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; color: rgb(0, 0, 0); overflow-x: hidden; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;"&gt;Johnson &amp;amp; Johnson&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;"&gt;4.2&lt;/td&gt;
&lt;td style="break-inside: avoid-page; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); text-align: left; white-space: nowrap; width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"&gt;&lt;span style="visibility: hidden; margin-left: -7pt;"&gt;%&lt;/span&gt;&lt;/td&gt; &lt;/tr&gt;
&lt;tr style="border-bottom-width: initial; border-bottom-style: none; break-inside: avoid-page; height: auto; font-family: 'arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial;"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; color: rgb(0, 0, 0); overflow-x: hidden; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;"&gt;Novartis AG, ADR&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;"&gt;3.4&lt;/td&gt;
&lt;td style="break-inside: avoid-page; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); text-align: left; white-space: nowrap; width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"&gt;&lt;span style="visibility: hidden; margin-left: -7pt;"&gt;%&lt;/span&gt;&lt;/td&gt; &lt;/tr&gt;
&lt;tr style="border-bottom-width: 0.5pt; border-bottom-style: solid; break-inside: avoid-page; height: auto; font-family: 'arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: rgb(0, 0, 0);"&gt;
&lt;td style="break-inside: avoid-page; font-kerning: none; color: rgb(0, 0, 0); overflow-x: hidden; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 1.6pt 6pt;"&gt;Walmart, Inc.&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 1.6pt 0;"&gt;3.3&lt;/td&gt;
&lt;td style="break-inside: avoid-page; vertical-align: bottom; font-kerning: none; color: rgb(0, 0, 0); text-align: left; white-space: nowrap; width: auto; font-family: 'Arial'; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 1.6pt 0;"&gt;&lt;span style="visibility: hidden; margin-left: -7pt;"&gt;%&lt;/span&gt;&lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; (b)Excludes short-term securities.</oef:LargestHoldingsTableTextBlock>
    <oef:PctOfNav
      contextRef="TI20251231_C000004917Member_MicrosoftCorpMember"
      decimals="4"
      id="h_20_b6c1a5d9_f927_42d3_a882_533301a5d9b3"
      unitRef="pure">0.275</oef:PctOfNav>
    <oef:PctOfNav
      contextRef="TI20251231_C000004917Member_BerkshireHathawayIncClassBMember"
      decimals="4"
      id="h_21_d5d90d81_3eca_40b7_9d8d_333cc6a5a6b9"
      unitRef="pure">0.101</oef:PctOfNav>
    <oef:PctOfNav
      contextRef="TI20251231_C000004917Member_JPMorganChaseAndCoMember"
      decimals="4"
      id="h_22_1bc7f7f8_a907_4961_84a7_c27fadf04a8f"
      unitRef="pure">0.100</oef:PctOfNav>
    <oef:PctOfNav
      contextRef="TI20251231_C000004917Member_GeneralDynamicsCorpMember"
      decimals="4"
      id="h_23_9df15dcf_07ad_4885_839b_dff121ef4cee"
      unitRef="pure">0.095</oef:PctOfNav>
    <oef:PctOfNav
      contextRef="TI20251231_C000004917Member_AmericanExpressCoMember"
      decimals="4"
      id="h_24_ed7a5eb0_9026_4a95_86e7_bbc5fa2e50b4"
      unitRef="pure">0.082</oef:PctOfNav>
    <oef:PctOfNav
      contextRef="TI20251231_C000004917Member_VisaIncClassAMember"
      decimals="4"
      id="h_25_b593bee7_8a76_449a_9d1c_572deea0b09f"
      unitRef="pure">0.050</oef:PctOfNav>
    <oef:PctOfNav
      contextRef="TI20251231_C000004917Member_AstraZenecaPLCADRMember"
      decimals="4"
      id="h_26_cb9d6c3f_6c47_4799_a75e_e796392564af"
      unitRef="pure">0.043</oef:PctOfNav>
    <oef:PctOfNav
      contextRef="TI20251231_C000004917Member_JohnsonAndJohnsonMember"
      decimals="4"
      id="h_27_739108d4_0cad_4732_a77d_50f6b61a80b1"
      unitRef="pure">0.042</oef:PctOfNav>
    <oef:PctOfNav
      contextRef="TI20251231_C000004917Member_NovartisAGADRMember"
      decimals="4"
      id="h_28_3f2152fe_e644_46d5_8a31_cf0547a09b90"
      unitRef="pure">0.034</oef:PctOfNav>
    <oef:PctOfNav
      contextRef="TI20251231_C000004917Member_WalmartIncMember"
      decimals="4"
      id="h_29_baeca2c4_16ac_45e3_acaa_b3d1dc07ff4c"
      unitRef="pure">0.033</oef:PctOfNav>
    <oef:MaterialFundChngTextBlock
      contextRef="FY2025_C000004917Member"
      id="t_30_a7ef81f4_d5de_2b47_a278_e80fa596a37f">&lt;div style="font-kerning: none; font-family: 'arial'; font-weight: bold; font-size: 10pt; color: rgb(0, 0, 0); margin-bottom: -0.18pt; margin-top: 0px;"&gt;Material fund changes&lt;/div&gt;&lt;div style="margin-top: 0px; font-kerning: none; font-family: 'arial'; font-size: 8pt; line-height: 10.4pt; text-align: justify; color: rgb(0, 0, 0); margin-bottom: 3.5pt;"&gt;This is a summary of certain changes to the Fund since December 31, 2024. For more complete information, you may review the Fund&#x2019;s next prospectus, which we expect to be available approximately 120 days after December 31, 2025 at &lt;span style="color: rgb(0, 0, 0); font-weight: bold; text-decoration-line: none; font-family: 'arial'; font-size: 8pt; line-height: 10.4pt; text-align: justify;"&gt;blackrock.com/fundreports&lt;/span&gt; or upon request by contacting us at (800) 441-7762.&lt;/div&gt;&lt;div style="margin-top: 0px; font-kerning: none; font-family: 'arial'; font-size: 8pt; line-height: 10.4pt; text-align: justify; color: rgb(0, 0, 0); margin-bottom: 3.5pt;"&gt;The net expense ratio increased from the prior fiscal year primarily due to a change in the Fund&#x2019;s operating expenses.&lt;/div&gt;</oef:MaterialFundChngTextBlock>
    <oef:SummaryOfChngLegendTextBlock
      contextRef="FY2025_C000004917Member"
      id="t_31_42e8549b_bdd0_53b7_3df6_97b2038b59cc">&lt;div style="margin-top: 0px; font-kerning: none; font-family: 'arial'; font-size: 8pt; line-height: 10.4pt; text-align: justify; color: rgb(0, 0, 0); margin-bottom: 3.5pt;"&gt;This is a summary of certain changes to the Fund since December 31, 2024. For more complete information, you may review the Fund&#x2019;s next prospectus, which we expect to be available approximately 120 days after December 31, 2025 at &lt;span style="color: rgb(0, 0, 0); font-weight: bold; text-decoration-line: none; font-family: 'arial'; font-size: 8pt; line-height: 10.4pt; text-align: justify;"&gt;blackrock.com/fundreports&lt;/span&gt; or upon request by contacting us at (800) 441-7762.&lt;/div&gt;</oef:SummaryOfChngLegendTextBlock>
    <oef:UpdProspectusWebAddress
      contextRef="FY2025_C000004917Member"
      id="t_24_fcdbaa29_75a7_898c_daaf_eec21fd68e4c">blackrock.com/fundreports</oef:UpdProspectusWebAddress>
    <oef:UpdProspectusPhoneNumber
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