<?xml version="1.0" encoding="utf-8"?>
<xbrl
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:dei="http://xbrl.sec.gov/dei/2026"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:xlink="http://www.w3.org/1999/xlink">
    <link:schemaRef xlink:href="gtao-20261007.xsd" xlink:type="simple"/>
    <context id="C_d8010cff-e698-48be-a47e-d05148a47577">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0002029297</identifier>
        </entity>
        <period>
            <startDate>2026-10-07</startDate>
            <endDate>2026-10-07</endDate>
        </period>
    </context>
    <dei:EntityCentralIndexKey
      contextRef="C_d8010cff-e698-48be-a47e-d05148a47577"
      id="F_7195239e-320f-43d0-8042-b706562e329f">0002029297</dei:EntityCentralIndexKey>
    <dei:AmendmentFlag
      contextRef="C_d8010cff-e698-48be-a47e-d05148a47577"
      id="F_63859306-787e-468f-a883-ab9cac92443c">false</dei:AmendmentFlag>
    <dei:DocumentType
      contextRef="C_d8010cff-e698-48be-a47e-d05148a47577"
      id="F_70a58bd1-7b5b-4752-85a4-f48cf2b31960">8-K</dei:DocumentType>
    <dei:DocumentPeriodEndDate
      contextRef="C_d8010cff-e698-48be-a47e-d05148a47577"
      id="F_ed5b1687-ec95-4d45-a65f-675b336ce8a5">2026-10-07</dei:DocumentPeriodEndDate>
    <dei:EntityRegistrantName
      contextRef="C_d8010cff-e698-48be-a47e-d05148a47577"
      id="F_399ddb5a-1ba9-4b9c-8f4a-322e362b17ca">Grayscale Bittensor Trust (TAO)</dei:EntityRegistrantName>
    <dei:EntityIncorporationStateCountryCode
      contextRef="C_d8010cff-e698-48be-a47e-d05148a47577"
      id="F_79eee3fa-41d5-4bc6-a33b-e13a32c5230b">DE</dei:EntityIncorporationStateCountryCode>
    <dei:EntityFileNumber
      contextRef="C_d8010cff-e698-48be-a47e-d05148a47577"
      id="F_8e3add4b-9818-4f0a-8787-608a5490dcb5">000-56788</dei:EntityFileNumber>
    <dei:EntityTaxIdentificationNumber
      contextRef="C_d8010cff-e698-48be-a47e-d05148a47577"
      id="F_c6b126a7-1c3a-4db2-b338-35fe46ffaaed">99-6506784</dei:EntityTaxIdentificationNumber>
    <dei:EntityAddressAddressLine1
      contextRef="C_d8010cff-e698-48be-a47e-d05148a47577"
      id="F_da5eb168-7db0-4030-a363-c66cf1ec1e23">c/o Grayscale Investments Sponsors, LLC</dei:EntityAddressAddressLine1>
    <dei:EntityAddressAddressLine2
      contextRef="C_d8010cff-e698-48be-a47e-d05148a47577"
      id="F_95dfb175-dd23-4941-b2f3-351409737cf6">290 Harbor Drive, 4th Floor</dei:EntityAddressAddressLine2>
    <dei:EntityAddressCityOrTown
      contextRef="C_d8010cff-e698-48be-a47e-d05148a47577"
      id="F_1b026ff4-8822-455e-bdfb-8661599b378f">Stamford</dei:EntityAddressCityOrTown>
    <dei:EntityAddressStateOrProvince
      contextRef="C_d8010cff-e698-48be-a47e-d05148a47577"
      id="F_4e2a6ae9-4140-44ee-82eb-54253a2caa98">CT</dei:EntityAddressStateOrProvince>
    <dei:EntityAddressPostalZipCode
      contextRef="C_d8010cff-e698-48be-a47e-d05148a47577"
      id="F_c09c8a7d-22cf-4776-af96-6173fe510142">06902</dei:EntityAddressPostalZipCode>
    <dei:CityAreaCode
      contextRef="C_d8010cff-e698-48be-a47e-d05148a47577"
      id="F_1752800e-958a-4195-937e-fd588cf31abb">212</dei:CityAreaCode>
    <dei:LocalPhoneNumber
      contextRef="C_d8010cff-e698-48be-a47e-d05148a47577"
      id="F_8d57bed8-74af-4deb-8b14-b7e76f893a81">668-1427</dei:LocalPhoneNumber>
    <dei:WrittenCommunications
      contextRef="C_d8010cff-e698-48be-a47e-d05148a47577"
      id="F_9f5ac25f-bfd0-4c5b-9199-108aa75e9c6c">false</dei:WrittenCommunications>
    <dei:SolicitingMaterial
      contextRef="C_d8010cff-e698-48be-a47e-d05148a47577"
      id="F_ac3979c9-3586-4668-90f3-f64a05df9d9c">false</dei:SolicitingMaterial>
    <dei:PreCommencementTenderOffer
      contextRef="C_d8010cff-e698-48be-a47e-d05148a47577"
      id="F_9ee68ad1-d8f9-414d-91e9-315bc2f04cb6">false</dei:PreCommencementTenderOffer>
    <dei:PreCommencementIssuerTenderOffer
      contextRef="C_d8010cff-e698-48be-a47e-d05148a47577"
      id="F_d4365c16-f510-4130-9707-7c1fd29ec3f0">false</dei:PreCommencementIssuerTenderOffer>
    <dei:Security12gTitle
      contextRef="C_d8010cff-e698-48be-a47e-d05148a47577"
      id="F_f68aa55f-1e53-4fc1-b7db-08e6e882e640">Grayscale Bittensor Trust (TAO) Shares</dei:Security12gTitle>
    <dei:TradingSymbol
      contextRef="C_d8010cff-e698-48be-a47e-d05148a47577"
      id="F_ff279af1-999f-4d7a-bb1c-468f188be9d7">GTAO</dei:TradingSymbol>
    <dei:EntityEmergingGrowthCompany
      contextRef="C_d8010cff-e698-48be-a47e-d05148a47577"
      id="F_ec7414fb-11c9-4932-8074-67da2dcf8883">true</dei:EntityEmergingGrowthCompany>
    <dei:EntityExTransitionPeriod
      contextRef="C_d8010cff-e698-48be-a47e-d05148a47577"
      id="F_eda6d150-30d6-4bf4-9375-ecb18a5b500d">false</dei:EntityExTransitionPeriod>
</xbrl>
