3.24.2.u1 html 37 105 1 false 12 0 false 6 false false R1.htm 100000 - Document - Cover Page Sheet http://grayscale.com/20240630/taxonomy/role/Role_DocumentCoverPage Cover Page Cover 1 false false R2.htm 100010 - Statement - Statements of Assets and Liabilities Sheet http://grayscale.com/20240630/taxonomy/role/Role_StatementStatementsOfAssetsAndLiabilities Statements of Assets and Liabilities Statements 2 false false R3.htm 100020 - Statement - Statements of Assets and Liabilities (Parenthetical) Sheet http://grayscale.com/20240630/taxonomy/role/Role_StatementStatementsOfAssetsAndLiabilitiesParenthetical Statements of Assets and Liabilities (Parenthetical) Statements 3 false false R4.htm 100030 - Statement - Schedules of Investment Sheet http://grayscale.com/20240630/taxonomy/role/Role_StatementSchedulesOfInvestment Schedules of Investment Statements 4 false false R5.htm 100050 - Statement - Statements of Operations Sheet http://grayscale.com/20240630/taxonomy/role/Role_StatementStatementsOfOperations Statements of Operations Statements 5 false false R6.htm 100060 - Statement - Statement of Changes in Net Assets Sheet http://grayscale.com/20240630/taxonomy/role/Role_StatementStatementOfChangesInNetAssets Statement of Changes in Net Assets Statements 6 false false R7.htm 100070 - Disclosure - Organization Sheet http://grayscale.com/20240630/taxonomy/role/Role_DisclosureOrganization Organization Notes 7 false false R8.htm 100080 - Disclosure - Summary of Significant Accounting Policies Sheet http://grayscale.com/20240630/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 8 false false R9.htm 100090 - Disclosure - Fair Value of ETC Sheet http://grayscale.com/20240630/taxonomy/role/DisclosureFairValueOfEtc Fair Value of ETC Notes 9 false false R10.htm 100100 - Disclosure - Creations and Redemptions of Shares Sheet http://grayscale.com/20240630/taxonomy/role/Role_DisclosureCreationsAndRedemptionsOfShares Creations and Redemptions of Shares Notes 10 false false R11.htm 100110 - Disclosure - Income Taxes Sheet http://grayscale.com/20240630/taxonomy/role/Role_DisclosureIncomeTaxes Income Taxes Notes 11 false false R12.htm 100120 - Disclosure - Related Parties Sheet http://grayscale.com/20240630/taxonomy/role/Role_DisclosureRelatedParties Related Parties Notes 12 false false R13.htm 100130 - Disclosure - Risks and Uncertainties Sheet http://grayscale.com/20240630/taxonomy/role/Role_DisclosureRisksAndUncertainties Risks and Uncertainties Notes 13 false false R14.htm 100140 - Disclosure - Financial Highlights Per Share Performance Sheet http://grayscale.com/20240630/taxonomy/role/Role_DisclosureFinancialHighlightsPerSharePerformance Financial Highlights Per Share Performance Notes 14 false false R15.htm 100150 - Disclosure - Indemnifications Sheet http://grayscale.com/20240630/taxonomy/role/Role_DisclosureIndemnifications Indemnifications Notes 15 false false R16.htm 100160 - Disclosure - Subsequent Events Sheet http://grayscale.com/20240630/taxonomy/role/Role_DisclosureSubsequentEvents Subsequent Events Notes 16 false false R17.htm 100170 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://grayscale.com/20240630/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) Policies http://grayscale.com/20240630/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPolicies 17 false false R18.htm 100180 - Disclosure - Summary of Significant Accounting Policies (Tables) Sheet http://grayscale.com/20240630/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesTables Summary of Significant Accounting Policies (Tables) Tables http://grayscale.com/20240630/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPolicies 18 false false R19.htm 100190 - Disclosure - Fair Value of ETC (Tables) Sheet http://grayscale.com/20240630/taxonomy/role/DisclosureFairValueOfEtcTables Fair Value of ETC (Tables) Tables http://grayscale.com/20240630/taxonomy/role/DisclosureFairValueOfEtc 19 false false R20.htm 100200 - Disclosure - Financial Highlights Per Share Performance (Tables) Sheet http://grayscale.com/20240630/taxonomy/role/Role_DisclosureFinancialHighlightsPerSharePerformanceTables Financial Highlights Per Share Performance (Tables) Tables http://grayscale.com/20240630/taxonomy/role/Role_DisclosureFinancialHighlightsPerSharePerformance 20 false false R21.htm 100210 - Disclosure - Organization - Additional Information (Detail) Sheet http://grayscale.com/20240630/taxonomy/role/Role_DisclosureOrganizationAdditionalInformationDetail Organization - Additional Information (Detail) Details 21 false false R22.htm 100220 - Disclosure - Summary of Significant Accounting Policies - Summary of valuation techniques and observable inputs can vary by investment (Detail) Sheet http://grayscale.com/20240630/taxonomy/role/Role_DisclosureSummaryOfSignificantAccountingPoliciesSummaryOfValuationTechniquesAndObservableInputsCanVaryByInvestmentDetail Summary of Significant Accounting Policies - Summary of valuation techniques and observable inputs can vary by investment (Detail) Details 22 false false R23.htm 100230 - Disclosure - Fair Value of ETC - Additional Information (Detail) Sheet http://grayscale.com/20240630/taxonomy/role/DisclosureFairValueOfEtcAdditionalInformationDetail Fair Value of ETC - Additional Information (Detail) Details 23 false false R24.htm 100240 - Disclosure - Fair Value of ETC - Summary of changes in quantity of ETC and the respective fair value (Detail) Sheet http://grayscale.com/20240630/taxonomy/role/DisclosureFairValueOfEtcSummaryOfChangesInQuantityOfEtcAndTheRespectiveFairValueDetail Fair Value of ETC - Summary of changes in quantity of ETC and the respective fair value (Detail) Details 24 false false R25.htm 100250 - Disclosure - Creations and Redemptions of Shares - Additional Information (Detail) Sheet http://grayscale.com/20240630/taxonomy/role/Role_DisclosureCreationsAndRedemptionsOfSharesAdditionalInformationDetail Creations and Redemptions of Shares - Additional Information (Detail) Details 25 false false R26.htm 100260 - Disclosure - Income Taxes - Additional Information (Detail) Sheet http://grayscale.com/20240630/taxonomy/role/Role_DisclosureIncomeTaxesAdditionalInformationDetail Income Taxes - Additional Information (Detail) Details 26 false false R27.htm 100270 - Disclosure - Related Parties - Additional Information (Detail) Sheet http://grayscale.com/20240630/taxonomy/role/Role_DisclosureRelatedPartiesAdditionalInformationDetail Related Parties - Additional Information (Detail) Details 27 false false R28.htm 100280 - Disclosure - Financial Highlights Per Share Performance - Summary of Per Share Data (Detail) Sheet http://grayscale.com/20240630/taxonomy/role/DisclosureFinancialHighlightsPerSharePerformanceSummaryOfPerShareDataDetail Financial Highlights Per Share Performance - Summary of Per Share Data (Detail) Details 28 false false R29.htm 100290 - Disclosure - Subsequent Events - Additional Information (Detail) Sheet http://grayscale.com/20240630/taxonomy/role/Role_DisclosureSubsequentEventsAdditionalInformationDetail Subsequent Events - Additional Information (Detail) Details 29 false false All Reports Book All Reports etcg-20240630.htm etcg-20240630.xsd img27344669_0.jpg img27344669_1.jpg img27344669_2.jpg http://fasb.org/us-gaap/2024 http://xbrl.sec.gov/dei/2024 false false