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      <startDate>2020-02-28</startDate>
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  <rr:ProspectusDate contextRef="Duration_28Feb2020_28Feb2020">2020-02-28</rr:ProspectusDate>
  <dei:DocumentType contextRef="Duration_28Feb2020_28Feb2020">497</dei:DocumentType>
  <dei:DocumentPeriodEndDate contextRef="Duration_28Feb2020_28Feb2020">2019-10-31</dei:DocumentPeriodEndDate>
  <dei:EntityRegistrantName contextRef="Duration_28Feb2020_28Feb2020">Voya MUTUAL FUNDS</dei:EntityRegistrantName>
  <dei:EntityCentralIndexKey contextRef="Duration_28Feb2020_28Feb2020">0000895430</dei:EntityCentralIndexKey>
  <dei:AmendmentFlag contextRef="Duration_28Feb2020_28Feb2020">false</dei:AmendmentFlag>
  <dei:DocumentCreationDate contextRef="Duration_28Feb2020_28Feb2020">2020-08-20</dei:DocumentCreationDate>
  <dei:DocumentEffectiveDate contextRef="Duration_28Feb2020_28Feb2020">2020-08-20</dei:DocumentEffectiveDate>
  <rr:SupplementToProspectusTextBlock contextRef="Duration_28Feb2020_28Feb2020">&lt;center&gt;&lt;p style="padding-left: 0px;margin-top: 0px;margin-bottom: 0px;"&gt;&lt;b&gt;VOYA MUTUAL FUNDS&lt;/b&gt;&lt;br/&gt; Voya Global Bond&lt;br/&gt; Fund (the "Fund")&lt;/p&gt;
&lt;p style="padding-left: 0px;margin-top: 27px;margin-bottom: 0px;"&gt;Supplement dated August 20, 2020&lt;/p&gt;
&lt;p style="padding-left: 0px;margin: 0px;"&gt;to the Fund's Class A, Class C, Class I, Class P, Class R, Class R6, Class T and&lt;/p&gt;
&lt;p style="padding-left: 0px;margin: 0px;"&gt;Class W shares Prospectus dated February 28, 2020&lt;/p&gt;
&lt;p style="padding-left: 0px;margin-top: 2px;margin-bottom: 0px;"&gt;(the "Prospectus")&lt;/p&gt;&lt;/center&gt;
&lt;p style="padding-right: 103px;margin-top: 18px;margin-bottom: 0px;"&gt;On May 14, 2020, the Board of Trustees of Voya Mutual Funds approved modification to the contingent deferred sales charge ("CDSC") schedule for the Fund's Class A shares, increasing the Class A CDSC holding period from 6 months to 12 months effective July 31, 2020.&lt;/p&gt;
&lt;p style="margin-top: 18px;margin-bottom: 0px;"&gt;Effective immediately, the Fund's Prospectus is revised as follows:&lt;/p&gt;
&lt;p style="text-align: justify;padding-left: 48px;padding-right: 96px;margin-top: 17px;margin-bottom: 0px;text-indent: -24px;"&gt;1.&amp;nbsp;&amp;nbsp;&amp;nbsp;Footnote 1 following the table in the sub-section entitled "Fees and Expenses of the Fund &amp;#150; Annual Fund Operating Expenses" of the Fund's Prospectus is deleted in its entirety and replaced with the following:&lt;/p&gt;
&lt;p style="text-align: justify;padding-left: 96px;padding-right: 96px;margin-top: 15px;margin-bottom: 0px;text-indent: -48px;"&gt;1.&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;A contingent deferred sales charge applies to shares purchased without an initial sales charge, as part of an investment of $500,000 or more, and redeemed within 12 months of purchase.&lt;/p&gt;</rr:SupplementToProspectusTextBlock>
  <rr:SupplementToProspectusTextBlock contextRef="Duration_28Feb2020_28Feb2020S000012534_Member">&lt;center&gt;&lt;p style="padding-left: 0px;margin-top: 0px;margin-bottom: 0px;"&gt;&lt;b&gt;VOYA MUTUAL FUNDS&lt;/b&gt;&lt;br/&gt; Voya Global Bond&lt;br/&gt; Fund (the "Fund")&lt;/p&gt;
&lt;p style="padding-left: 0px;margin-top: 27px;margin-bottom: 0px;"&gt;Supplement dated August 20, 2020&lt;/p&gt;
&lt;p style="padding-left: 0px;margin: 0px;"&gt;to the Fund's Class A, Class C, Class I, Class P, Class R, Class R6, Class T and&lt;/p&gt;
&lt;p style="padding-left: 0px;margin: 0px;"&gt;Class W shares Prospectus dated February 28, 2020&lt;/p&gt;
&lt;p style="padding-left: 0px;margin-top: 2px;margin-bottom: 0px;"&gt;(the "Prospectus")&lt;/p&gt;&lt;/center&gt;
&lt;p style="padding-right: 103px;margin-top: 18px;margin-bottom: 0px;"&gt;On May 14, 2020, the Board of Trustees of Voya Mutual Funds approved modification to the contingent deferred sales charge ("CDSC") schedule for the Fund's Class A shares, increasing the Class A CDSC holding period from 6 months to 12 months effective July 31, 2020.&lt;/p&gt;
&lt;p style="margin-top: 18px;margin-bottom: 0px;"&gt;Effective immediately, the Fund's Prospectus is revised as follows:&lt;/p&gt;
&lt;p style="text-align: justify;padding-left: 48px;padding-right: 96px;margin-top: 17px;margin-bottom: 0px;text-indent: -24px;"&gt;1.&amp;nbsp;&amp;nbsp;&amp;nbsp;Footnote 1 following the table in the sub-section entitled "Fees and Expenses of the Fund &amp;#150; Annual Fund Operating Expenses" of the Fund's Prospectus is deleted in its entirety and replaced with the following:&lt;/p&gt;
&lt;p style="text-align: justify;padding-left: 96px;padding-right: 96px;margin-top: 15px;margin-bottom: 0px;text-indent: -48px;"&gt;1.&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;A contingent deferred sales charge applies to shares purchased without an initial sales charge, as part of an investment of $500,000 or more, and redeemed within 12 months of purchase.&lt;/p&gt;</rr:SupplementToProspectusTextBlock>
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