Document And Entity Information Statistical Measurement [Axis] Note To Financial Statement Details Textual Significant Accounting Policies Investment, Policy [Policy Text Block] Schedules of Investments (Unaudited) ecd_NonRule10b51ArrTrmntdFlag Non-Rule 10b5-1 Arrangement Terminated [Flag] Note 8 - Financial Highlights ecd_NonRule10b51ArrAdoptedFlag Non-Rule 10b5-1 Arrangement Adopted [Flag] Note 9 - Investing in Index Futures Trading Arrangements, by Individual [Table] Note 10 - Investment Valuation Material Terms of Trading Arrangement [Text Block] Schedules of Investments (Unaudited) - Investments (Details) Schedules of Investments (Unaudited) - Investments (Details) (Parentheticals) Schedules of Investments (Unaudited) - Open S&P GSCI ER Index Futures Contracts (Details) Financial Instrument [Axis] Schedules of Investments (Unaudited) - Open S&P GSCI ER Index Futures Contracts (Details) (Parentheticals) Note 8 - Financial Highlights - Net Asset Value and Financial Highlights (Details) Minimum [Member] Note 9 - Investing in Index Futures - Effect of the Futures Contracts, by Risk Exposure Category, on the Statements of Financial Condition (Details) Note 9 - Investing in Index Futures - Effect of the Futures Contracts, by Risk Exposure Category, on the Statements of Operations (Details) Statistical Measurement [Domain] Note 10 - Investment Valuation - Valuation of the Trust's Investments by the Fair Value Hierarchy (Details) Maximum [Member] Notes To Financial Statements United States Treasury Bills 3.71% – 3.79% due 10/13/26 [Member] Represents information pertaining to United States Treasury Bills 3.71% – 3.79% due 10/13/26. Net asset value per Share (Note 2G) (in dollars per share) Notes To Financial Statements [Abstract] United States Treasury Bills 3.75% – 3.76% due 10/15/26 [Member] Represents information pertaining to United States Treasury Bills 3.75% – 3.76% due 10/15/26. United States Treasury Bills 3.71% – 3.76% due 10/06/26 [Member] Represents information pertaining to United States Treasury Bills 3.71% – 3.76% due 10/06/26. United States Treasury Bills 3.75% – 3.79% due 10/08/26 [Member] Represents information pertaining to United States Treasury Bills 3.75% – 3.79% due 10/08/26. Percentage of net asset value Futures [Member] This item represents futures. Shares, par value (in dollars per share) United States Treasury Bills 3.79% due 11/12/26 [Member] Represents information pertaining to United States Treasury Bills 3.79% due 11/12/26. Cash Flows from Operating Activities United States Treasury Bills 3.99% – 4.01% due 11/17/26 [Member] Represents information pertaining to United States Treasury Bills 3.99% – 4.01% due 11/17/26. United States Treasury Bills 3.79% – 3.82% due 11/05/26 [Member] Represents information pertaining to United States Treasury Bills 3.79% – 3.82% due 11/05/26. United States Treasury Bills 3.93% due 11/10/26 [Member] Represents information pertaining to United States Treasury Bills 3.93% due 11/10/26. us-gaap_NetCashProvidedByUsedInOperatingActivities Net cash provided by (used in) operating activities United States Treasury Bills 3.79% – 3.81% due 10/27/26 [Member] Represents information pertaining to United States Treasury Bills 3.79% – 3.81% due 10/27/26. Cash Flows from Financing Activities Business Description and Basis of Presentation [Text Block] United States Treasury Bills 3.80% – 3.81% due 11/03/26 [Member] Represents information pertaining to United States Treasury Bills 3.80% – 3.81% due 11/03/26. United States Treasury Bills 3.72% – 3.84% due 10/20/26 [Member] Represents information pertaining to United States Treasury Bills 3.72% – 3.84% due 10/20/26. United States Treasury Bills 3.87% due 10/22/26 [Member] Represents information pertaining to United States Treasury Bills 3.87% due 10/22/26. us-gaap_NetCashProvidedByUsedInFinancingActivities Net cash provided by (used in) financing activities United States Treasury Bills 4.01% – 4.14% due 1/05/27 [Member] Represents information pertaining to United States Treasury Bills 4.01% – 4.14% due 1/05/27. us-gaap_ManagementAndServiceFeesBaseRate Management and Service Fees, Base Rate United States Treasury Bills 4.18% due 1/19/27 [Member] Represents information pertaining to United States Treasury Bills 4.18% due 1/19/27. United States Treasury Bills 4.06% due 12/17/26 [Member] Represents information pertaining to United States Treasury Bills 4.06% due 12/17/26. United States Treasury Bills 4.10% due 12/24/26 [Member] Represents information pertaining to United States Treasury Bills 4.10% due 12/24/26. United States Treasury Bills 3.83% due 12/03/26 [Member] Represents information pertaining to United States Treasury Bills 3.83% due 12/03/26. us-gaap_LiabilitiesFairValueDisclosure Total Liabilities United States Treasury Bills 3.93% – 4.09% due 12/10/26 [Member] Represents information pertaining to United States Treasury Bills 3.93% – 4.09% due 12/10/26. United States Treasury Bills 3.77% – 3.79% due 11/19/26 [Member] Represents information pertaining to United States Treasury Bills 3.77% – 3.79% due 11/19/26. United States Treasury Bills 3.78% – 3.99% due 11/27/26 [Member] Represents information pertaining to United States Treasury Bills 3.78% – 3.99% due 11/27/26. us-gaap_AssetsFairValueDisclosure Total Assets Futures contracts Net change in unrealized appreciation (depreciation) on futures contracts us-gaap_StockIssuedDuringPeriodSharesPeriodIncreaseDecrease Net decrease in Shares issued and outstanding (in shares) Net investment income Sales/maturities of short-term investments United States Treasury Bills 4.25% due 1/26/27 [Member] Represents information pertaining to United States Treasury Bills 4.25% due 1/26/27. us-gaap_RealizedGainLossInvestmentAndDerivativeOperatingAfterTax Net realized gain (loss) Accounting Policies [Abstract] us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments Short-term investments Net realized gain on short-term investments gsg_PolicyTable Financial Instruments [Domain] us-gaap_GrossInvestmentIncomeOperating Total investment income Net change in unrealized appreciation/depreciation Contributions for Shares issued Income Statement [Abstract] Cash Net increase (decrease) in net assets from capital share transactions Net increase in net assets resulting from operations Net increase (decrease) in net assets resulting from operations Adjustments to reconcile net increase (decrease) in net assets resulting from operations to net cash provided by (used in) operating activities: Liabilities us-gaap_NetInvestmentIncome Net investment income us-gaap_CostsAndExpenses Total expenses Investment Company, Distribution [Policy Text Block] us-gaap_IncreaseDecreaseInAccountsPayableRelatedParties Sponsor’s fee payable Change in operating assets and liabilities: Accounting Standards Update and Change in Accounting Principle [Table] Income Tax, Policy [Policy Text Block] gsg_ValueOfStockClassifiedAsTemporaryEquitySurrenderedDuringReportingPeriod Distributions for Shares redeemed Value of stock classified as temporary equity surrendered during the reporting period. Fair Value, by Balance Sheet Grouping [Table] us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect Net decrease in cash Cash us-gaap_CashAndCashEquivalentsFairValueDisclosure Related Party Transaction [Table] Related Party Transactions Disclosure [Text Block] us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations Beginning of period, Unrestricted – cash End of period, Unrestricted – cash us-gaap_IncreaseDecreaseInBrokerageReceivables Receivable for variation margin on open futures contracts Statement [Table] Fair Value Hierarchy and NAV [Domain] Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table] Statement of Financial Position [Abstract] Investment, fair value Expiration date Financial Support for Nonconsolidated Legal Entity [Table] Sponsor’s fee payable Receivable for variation margin on open futures contracts Receivable for variation margin on open futures contracts (Note 9) Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table Text Block] gsg_Redemptions Distributions for Shares redeemed The cash outflow to surrender redeemable capital shares in connection with a redemption order. us-gaap_UnrealizedGainLossInvestmentDerivativeAndForeignCurrencyTransactionPriceChangeOperatingBeforeTax Net change in unrealized appreciation/depreciation Net unrealized appreciation (depreciation) us-gaap_NetAssetValuePerShare Net asset value per Share, beginning of period (in dollars per share) Net asset value per Share, end of period (in dollars per share) us-gaap_RealizedGainLossInvestmentDerivativeAndForeignCurrencyTransactionPriceChangeOperatingBeforeTax Net realized gain Document Type Securities Transactions Income and Expense Recognition [Policy Text Block] Describes the entity's accounting policy for securities transactions and recognition of income and expense. Expenses Document Information [Line Items] Document Quarterly Report Calculation of Net Asset Value [Policy Text Block] The method used by the entity to calculate the net asset value. Document Information [Table] us-gaap_RealizedAndUnrealizedGainLossInvestmentDerivativeAndForeignCurrencyTransactionPriceChangeOperatingBeforeTax Net realized and unrealized gain Entity Interactive Data Current Assets [Abstract] Commitments and Contingencies Disclosure [Text Block] Document Transition Report Statement [Line Items] Net Assets – 100.00% Net Assets Net Assets, Beginning of Period Net Assets, End of Period Net Realized and Unrealized Gain (Loss) gsg_SharesPrescribedAggregation Shares Prescribed Aggregation (in shares) Prescribed aggregation at which shares are issued and redeemed. Net change in unrealized appreciation/depreciation on: Fair Value Hierarchy and NAV [Axis] Expenses [Text Block] The entire disclosure for expenses. gsg_LegalFeesPerYearMaximum Legal Fees Per Year Maximum Maximum per annum in legal fees and expenses the sponsor has agreed to assume. Indemnification [Text Block] The entire disclosure for indemnification. Net increase in net assets per Share (in dollars per share) gsg_AverageMonthEndNotionalAmountOfDerivativeContracts Average Month-End Notional Amount of Derivative Contracts Average month end notional amount specified by the derivative contracts. Contributions for Shares issued us-gaap_ProceedsFromOtherEquity us-gaap_PolicyTextBlockAbstract Accounting Policies Accretion of discount us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements us-gaap_TableTextBlock Notes Tables Document Fiscal Period Focus Short-term investments held at the broker (restricted), at fair value Deposits with Clearing Organizations and Others, Securities Document Fiscal Year Focus Amendment Flag Short-term investments, at fair value Short-Term Investments U.S. Treasury bills and notes, due date Document Period End Date Investment [Table Text Block] Legal Entity [Axis] Significant Accounting Policies [Text Block] Entity File Number Entity Tax Identification Number Entity [Domain] Entity Central Index Key Entity Registrant Name Entity Current Reporting Status Entity Incorporation, State or Country Code Payable for variation margin on open futures contracts Payable for variation margin on open futures contracts (Note 9) Current Fiscal Year End Date Entity Filer Category Entity Shell Company Entity Emerging Growth Company Derivative Asset, Statement of Financial Position [Extensible Enumeration] Entity Small Business Number of contracts Investments [Domain] Investment Income Current notional amount Sponsor’s fee Derivative Instruments and Hedging Activities Disclosure [Text Block] United States Treasury Bills 3.92% due 1/06/26 [Member] Represents information pertaining to United States Treasury Bills 3.92% due 1/06/26. Loss Contingencies [Table] Entity Address, State or Province Statement of Stockholders' Equity [Abstract] Entity Address, City or Town Operations Entity Address, Address Line One gsg_IncreaseDecreaseInNetAssets Increase (decrease) in net assets Increase (decrease) in net assets during the period. Statement of Cash Flows [Abstract] City Area Code Shares issued and redeemed U.S. Treasury bills and notes, effective rate Represents the effective yield for the U.S. Treasury Bill. Local Phone Number gsg_SharesOfStockClassifedAsTemporaryEquitySurrenderedDuringReportingPeriod Shares redeemed (in shares) Number of stock classified as temporary equity surrendered during the reporting period. Brokerage commissions and fees Entity Address, Postal Zip Code Total percentage of net asset value The percentage of net assets of net assets. Derivative [Table] Title of 12(b) Security Equity Components [Axis] Security Exchange Name Trading Symbol Derivatives, Policy [Policy Text Block] Class of Stock [Axis] United States Treasury Bills 3.91% – 3.92% due 1/13/26 [Member] Represents information pertaining to United States Treasury Bills 3.91% – 3.92% due 1/13/26. Equity Component [Domain] United States Treasury Bills 3.88% – 3.94% due 1/08/26 [Member] Represents information pertaining to United States Treasury Bills 3.88% – 3.94% due 1/08/26. United States Treasury Bills 3.89% – 3.94% due 1/20/26 [Member] Represents information pertaining to United States Treasury Bills 3.89% – 3.94% due 1/20/26. Fair Value, Inputs, Level 2 [Member] Commodity Contract [Member] United States Treasury Bills 3.57% – 3.95% due 1/15/26 [Member] Represents information pertaining to United States Treasury Bills 3.57% – 3.95% due 1/15/26. Fair Value, Inputs, Level 3 [Member] Equity [Text Block] Fair Value, Inputs, Level 1 [Member] Entity Common Stock, Shares Outstanding United States Treasury Bills 3.92% – 3.94% due 1/02/26 [Member] Represents information pertaining to United States Treasury Bills 3.92% – 3.94% due 1/02/26. United States Treasury Bills 3.63% – 3.89% due 2/12/26 [Member] Represents information pertaining to United States Treasury Bills 3.63% – 3.89% due 2/12/26. United States Treasury Bills 3.64% – 3.67% due 2/10/26 [Member] Represents information pertaining to United States Treasury Bills 3.64% – 3.67% due 2/10/26. United States Treasury Bills 3.79% due 2/17/26 [Member] Represents information pertaining to United States Treasury Bills 3.79% due 2/17/26. United States Treasury Bills 3.86% – 3.89% due 1/27/26 [Member] Represents information pertaining to United States Treasury Bills 3.86% – 3.89% due 1/27/26. United States Treasury Bills 3.58% – 3.86% due 1/22/26 [Member] Represents information pertaining to United States Treasury Bills 3.58% – 3.86% due 1/22/26. United States Treasury Bills 3.87% due 2/05/26 [Member] Represents information pertaining to United States Treasury Bills 3.87% due 2/05/26. United States Treasury Bills 3.61% – 3.86% due 1/29/26 [Member] Represents information pertaining to United States Treasury Bills 3.61% – 3.86% due 1/29/26. United States Treasury Bills 3.66% due 3/12/26 [Member] Represents information pertaining to United States Treasury Bills 3.66% due 3/12/26. United States Treasury Bills 3.69% – 3.82% due 3/10/26 [Member] Represents information pertaining to United States Treasury Bills 3.69% – 3.82% due 3/10/26. United States Treasury Bills 3.61% due 3/19/26 [Member] Represents information pertaining to United States Treasury Bills 3.61% due 3/19/26. United States Treasury Bills 3.74% due 3/17/26 [Member] Represents information pertaining to United States Treasury Bills 3.74% due 3/17/26. gsg_IncreaseDecreaseInPayableForVariationMarginOnOpenFuturesContracts Payable for variation margin on open futures contracts The increase (decrease) during the reporting period in payable for variable for variation margin on open futures contracts. United States Treasury Bills 3.81% due 2/24/26 [Member] Represents information pertaining to United States Treasury Bills 3.81% due 2/24/26. United States Treasury Bills 3.82% due 2/19/26 [Member] Represents information pertaining to United States Treasury Bills 3.82% due 2/19/26. United States Treasury Bills 3.69% – 3.71% due 3/05/26 [Member] Represents information pertaining to United States Treasury Bills 3.69% – 3.71% due 3/05/26. United States Treasury Bills 3.75% – 3.81% due 2/26/26 [Member] Represents information pertaining to United States Treasury Bills 3.75% – 3.81% due 2/26/26. United States Treasury Bills 3.60% due 4/07/26 [Member] Represents information pertaining to United States Treasury Bills 3.60% due 4/07/26. United States Treasury Bills 3.70% due 3/24/26 [Member] Represents information pertaining to United States Treasury Bills 3.70% due 3/24/26. Derivative Instruments, Gain (Loss) [Table Text Block] Derivative Instruments, Gain (Loss) [Table] Basis of Accounting, Policy [Policy Text Block] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Cash and Cash Equivalents, Policy [Policy Text Block] Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Interest Fair Value Disclosures [Text Block] us-gaap_InvestmentOwnedAtFairValue Total U.S. Treasury bills and notes Shares issued and outstanding (in shares) Shares, outstanding (in shares) Schedule of Investments [Text Block] Investment Company, Financial Highlights [Text Block] Investment Holdings [Table] Investment Company, Financial Highlights [Table Text Block] Schedule of Derivative Instruments [Table Text Block] Investment Type [Axis] Short-term investments us-gaap_MarketableSecuritiesUnrealizedGainLoss Net change in unrealized appreciation/depreciation on short-term investments us-gaap_InvestmentCompanyInvestmentIncomeLossFromOperationsPerShare Net increase in net assets from operations (in dollars per share) Net investment income (in dollars per share) U.S. Treasury bills and notes, face amount Net realized and unrealized gain (loss) (in dollars per share) Investment Company, Financial Highlights [Table] Cost of short-term investments Total return, at net asset value Liabilities percentage of net asset value us-gaap_InvestmentCompanyInvestmentIncomeLossRatio Net investment income Other Assets, Less Liabilities Ratio to average net assets: us-gaap_InvestmentCompanyExpenseRatioAfterIncentiveAllocation Expenses Other Commitments [Table] Cost of short-term investments held at broker (restricted) Capital Share Transactions Segment Reporting, Policy [Policy Text Block] US Treasury Bill Securities [Member] Stock, Class of Stock [Table] U.S. Treasury bills and notes, fair value us-gaap_PaymentsToAcquireShortTermInvestments Purchases of short-term investments Nature of Operation, Product Information, Concentration of Risk [Table] ecd_Rule10b51ArrTrmntdFlag Rule 10b5-1 Arrangement Terminated [Flag] ecd_Rule10b51ArrAdoptedFlag Rule 10b5-1 Arrangement Adopted [Flag] Net realized gain (loss) from futures contracts Futures contracts Commitments and contingent liabilities (Note 7) Shares issued (in shares)