Document And Entity Information
Note To Financial Statement Details Textual
Significant Accounting Policies
Schedules of Investments (Unaudited)
Note 8 - Financial Highlights
Note 9 - Investing in Index Futures
Note 10 - Investment Valuation
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)
Note 8 - Financial Highlights - Net Asset Value and Financial Highlights (Details)
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)
Note 10 - Investment Valuation - Valuation of the Trust's Investments by the Fair Value Hierarchy (Details)
Notes To Financial Statements
Notes To Financial Statements [Abstract]
Futures [Member]
This item represents futures.
us-gaap_Revenues
Total investment income
United States Treasury Bills 0.05% – 0.08% Due 1/05/21 [Member]
Represents information pertaining to United States Treasury Bills 0.05% – 0.08% due 1/05/21.
Expenses
United States Treasury Bills 0.06% – 0.10% Due 1/07/21 [Member]
Represents information pertaining to United States Treasury Bills 0.06% – 0.10% due 1/07/21.
Accretion of discount
Income Tax, Policy [Policy Text Block]
us-gaap_AssetsFairValueDisclosure
Total Assets
Interest
United States Treasury Bills 0.08% – 0.09% Due 1/28/21 [Member]
Represents information pertaining to United States Treasury Bills 0.08% – 0.09% due 1/28/21.
United States Treasury Bills 0.07% – 0.09% Due 2/04/21 [Member]
Represents information pertaining to United States Treasury Bills 0.07% – 0.09% due 2/04/21.
Number of contracts
United States Treasury Bills 0.06% – 0.07% Due 2/09/21 [Member]
Represents information pertaining to United States Treasury Bills 0.06% – 0.07% due 2/09/21.
United States Treasury Bills 0.11% Due 2/11/21 [Member]
Represents information pertaining to United States Treasury Bills 0.11% due 2/11/21.
United States Treasury Bills 0.07% – 0.08% Due 1/12/21 [Member]
Represents information pertaining to United States Treasury Bills 0.07% – 0.08% due 1/12/21.
Net Assets – 100.00%
Net Assets
Net Assets, Beginning of Period
Net Assets, End of Period
United States Treasury Bills 0.07% – 0.10% Due 1/14/21 [Member]
Represents information pertaining to United States Treasury Bills 0.07% – 0.10% due 1/14/21.
United States Treasury Bills 0.07% Due 1/19/21 [Member]
Represents information pertaining to United States Treasury Bills 0.07% due 1/19/21.
United States Treasury Bills 0.07% – 0.11% Due 1/21/21 [Member]
Represents information pertaining to United States Treasury Bills 0.07% – 0.11% due 1/21/21.
Schedule of Derivative Instruments [Table Text Block]
United States Treasury Bills 0.08% Due 3/23/21 [Member]
Represents information pertaining to United States Treasury Bills 0.08% due 3/23/21.
United States Treasury Bills 0.06% Due 4/15/21 [Member]
Represents information pertaining to United States Treasury Bills 0.06% due 4/15/21.
Net change in unrealized appreciation/depreciation on:
us-gaap_LiabilitiesFairValueDisclosure
Total Liabilities
United States Treasury Bills 0.07% – 0.11% Due 2/18/21 [Member]
Represents information pertaining to United States Treasury Bills 0.07% – 0.11% due 2/18/21.
United States Treasury Bills 0.09% Due 2/25/21 [Member]
Represents information pertaining to United States Treasury Bills 0.09% due 2/25/21.
United States Treasury Bills 0.10% Due 3/04/21 [Member]
Represents information pertaining to United States Treasury Bills 0.10% due 3/04/21.
United States Treasury Bills 0.07% Due 3/11/21 [Member]
Represents information pertaining to United States Treasury Bills 0.07% due 3/11/21.
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
Cash
us-gaap_CashAndCashEquivalentsFairValueDisclosure
Futures contracts
Net change in unrealized appreciation/depreciation on futures contracts
Stockholders' Equity Note Disclosure [Text Block]
Investment, fair value
us-gaap_RealizedInvestmentGainsLosses
Net realized gain (loss)
Net realized gain (loss)
Commodity Contract [Member]
Net realized gain (loss) from futures contracts
Futures contracts
Other Assets, Less Liabilities
Liabilities percentage of net asset value
Sales/maturities of short-term investments
Net Realized and Unrealized Gain (Loss)
us-gaap_PaymentsToAcquireShortTermInvestments
Purchases of short-term investments
us-gaap_InvestmentOwnedAtFairValue
U.S. Treasury bills, fair value
Adjustments to reconcile net increase (decrease) in net assets resulting from operations to net cash provided by (used in) operating activities:
Statistical Measurement [Domain]
Maximum [Member]
Minimum [Member]
Statistical Measurement [Axis]
us-gaap_PolicyTextBlockAbstract
Accounting Policies
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table Text Block]
Fair Value, Inputs, Level 3 [Member]
Payable for capital shares redeemed
Carrying value as of the balance sheet date of liabilities incurred and payable for capital shares redeemed.
Fair Value Hierarchy and NAV [Domain]
Fair Value, Inputs, Level 1 [Member]
Fair Value, Inputs, Level 2 [Member]
Fair Value Hierarchy and NAV [Axis]
Liabilities
gsg_ValueOfStockClassifiedAsTemporaryEquitySurrenderedDuringReportingPeriod
Distributions for Shares redeemed
Value of stock classified as temporary equity surrendered during the reporting period.
U.S. Treasury bills, due date
Cash Flows from Operating Activities
Investment [Table Text Block]
Statement [Line Items]
Short-term investments, at fair value
Business Description and Basis of Presentation [Text Block]
Net asset value per Share (Note 2G) (in dollars per share)
Net asset value per Share, beginning of period (in dollars per share)
Net asset value per Share, end of period (in dollars per share)
Fair Value Disclosures [Text Block]
Shares issued and outstanding (in shares)
Shares, outstanding (in shares)
Net increase (decrease) in net assets resulting from operations
Net increase in net assets resulting from operations
Net increase (decrease) in net assets resulting from operations
Short-term investments held at the broker (restricted), at fair value
Deposits with Clearing Organizations and Others, Securities
Shares, par value (in dollars per share)
Assets
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
Net increase (decrease) in cash
United States Treasury Bills 0.01% Due 7/13/21 [Member]
Represents information pertaining to United States Treasury Bills 0.01% Due 7/13/21.
us-gaap_NetCashProvidedByUsedInFinancingActivities
Net cash provided by (used in) financing activities
United States Treasury Bills 0.00% due 7/15/21 [Member]
Represents information pertaining to United States Treasury Bills 0.00% due 7/15/21.
Commitments and contingent liabilities (Note 7)
United States Treasury Bills 0.00% due 7/20/21 [Member]
Represents information pertaining to United States Treasury Bills 0.00% due 7/20/21.
United States Treasury Bills 0.01% due 7/22/21 [Member]
Represents information pertaining to United States Treasury Bills 0.01% due 7/22/21.
Net investment income (loss)
Net Investment income (loss)
us-gaap_NetCashProvidedByUsedInOperatingActivities
Net cash provided by (used in) operating activities
United States Treasury Bills 0.03% due 8/10/21 [Member]
Represents information pertaining to United States Treasury Bills 0.03% due 8/10/21.
United States Treasury Bills 0.01% due 8/12/21 [Member]
Represents information pertaining to United States Treasury Bills 0.01% due 8/12/21.
Derivatives, Methods of Accounting, Derivatives Not Designated or Qualifying as Hedges [Policy Text Block]
United States Treasury Bills 0.01% – 0.04% due 8/17/21 [Member]
Represents information pertaining to United States Treasury Bills 0.01% – 0.04% due 8/17/21.
United States Treasury Bills 0.02% due 8/19/21 [Member]
Represents information pertaining to United States Treasury Bills 0.02% due 8/19/21.
United States Treasury Bills 0.01% due 7/27/21 [Member]
Represents information pertaining to United States Treasury Bills 0.01% due 7/27/21.
United States Treasury Bills 0.02% due 8/03/21 [Member]
Represents information pertaining to United States Treasury Bills 0.02% due 8/03/21.
United States Treasury Bills 0.01% – 0.04% due 8/05/21 [Member]
Represents information pertaining to United States Treasury Bills 0.01% – 0.04% due 8/05/21.
gsg_Redemptions
Distributions for Shares redeemed
The cash outflow to surrender redeemable capital shares in connection with a redemption order.
United States Treasury Bills 0.02% – 0.03% due 9/09/21 [Member]
Represents information pertaining to United States Treasury Bills 0.02% – 0.03% due 9/09/21.
United States Treasury Bills 0.03% due 9/16/21 [Member]
Represents information pertaining to United States Treasury Bills 0.03% due 9/16/21.
United States Treasury Bills 0.02% due 9/21/21 [Member]
Represents information pertaining to United States Treasury Bills 0.02% due 9/21/21.
Commitments and Contingencies Disclosure [Text Block]
United States Treasury Bills 0.01% – 0.05% due 8/24/21 [Member]
Represents information pertaining to United States Treasury Bills 0.01% – 0.05% due 8/24/21.
United States Treasury Bills 0.01% due 8/26/21 [Member]
Represents information pertaining to United States Treasury Bills 0.01% due 8/26/21.
United States Treasury Bills 0.04% due 8/31/21 [Member]
Represents information pertaining to United States Treasury Bills 0.04% due 8/31/21.
United States Treasury Bills 0.02% due 9/02/21 [Member]
Represents information pertaining to United States Treasury Bills 0.02% due 9/02/21.
Securities Transactions Income and Expense Recognition [Policy Text Block]
Describes the entity's accounting policy for securities transactions and recognition of income and expense.
Calculation of Net Asset Value [Policy Text Block]
The method used by the entity to calculate the net asset value.
Distributions [Policy Text Block]
Describes the entity's accounting policy regarding distributions to shareholders.
Investment, Policy [Policy Text Block]
Net increase in net assets from capital share transactions
Contributions for Shares issued
gsg_SharesPrescribedAggregation
Shares Prescribed Aggregation (in shares)
Prescribed aggregation at which shares are issued and redeemed.
Expenses [Text Block]
The entire disclosure for expenses.
gsg_SponsorsFeeAnnualizedAccrualRateBasedOnNetAssetValueOfTrust
Sponsors Fee Annualized Accrual Rate Based on Net Asset Value of Trust
Annualized sponsor's fee rate accrued daily based on the net asset value of the trust.
gsg_LegalFeesPerYearMaximum
Legal Fees Per Year Maximum
Maximum per annum in legal fees and expenses the sponsor has agreed to assume.
Payable for variation margin on open futures contracts
srt_PayablesToBrokerDealersAndClearingOrganizations
Indemnification [Text Block]
The entire disclosure for indemnification.
Current notional amount
Financial Highlights [Text Block]
Presentation of financial highlights related to investment performance and operations.
gsg_ExpensesToAverageNetAssetsRatio
Expenses
Ratio of expenses to average net assets.
gsg_AverageMonthEndNotionalAmountOfDerivativeContracts
Average Month-End Notional Amount of Derivative Contracts
Average month end notional amount specified by the derivative contracts.
us-gaap_CostsAndExpenses
Total expenses
Contributions for Shares issued
us-gaap_ProceedsFromOtherEquity
Investment Income
Related Party Transactions Disclosure [Text Block]
Expiration date
Contract expiration date.
Equity Components [Axis]
Equity Component [Domain]
Short-term investments
us-gaap_MarketableSecuritiesUnrealizedGainLossExcludingOtherThanTemporaryImpairments
Net change in unrealized appreciation/depreciation on short-term investments
us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments
Short-term investments
Net realized (gain) loss on short-term investments
us-gaap_GainLossOnInvestments
Net realized and unrealized gain (loss)
Sponsor’s fees payable
us-gaap_IncreaseDecreaseInAccountsPayableRelatedParties
Total return, at net asset value
Represents total return at net asset value based on the change in net asset value of a share during the period.
us-gaap_CashAndCashEquivalentsAtCarryingValue
Beginning of year, Unrestricted — cash
End of year, Unrestricted — cash
Cash and Cash Equivalents, Policy [Policy Text Block]
Balance Sheet Location [Axis]
Balance Sheet Location [Domain]
Document Quarterly Report
Amendment Flag
Entity Incorporation, State or Country Code
Accounting Policies [Abstract]
Significant Accounting Policies [Text Block]
Document Transition Report
City Area Code
Basis of Accounting, Policy [Policy Text Block]
Operations:
gsg_IncreaseDecreaseInNetAssets
Increase (decrease) in net assets
Increase (decrease) in net assets during the period.
Entity Interactive Data Current
Capital Share Transactions:
Shares issued and redeemed
U.S. Treasury bills, effective rate
Represents the effective yield for the U.S. Treasury Bill.
Shares redeemed (in shares)
Number of stock classified as temporary equity surrendered during the reporting period.
Total percentage of net asset value
The percentage of net assets of net assets.
Security Exchange Name
Title of 12(b) Security
U.S. Treasury bills, fair value
Current Fiscal Year End Date
us-gaap_StockIssuedDuringPeriodSharesPeriodIncreaseDecrease
Net increase (decrease) in Shares issued and outstanding (in shares)
Net Realized Gain Loss from Futures Contracts [Member]
Represents Statements of Operations location - Net realized gain or loss from futures contracts.
Document Fiscal Period Focus
Document Fiscal Year Focus
Cost of short-term investments held at broker (restricted)
Document Period End Date
Income Statement Location [Axis]
Receivable for variation margin on open futures contracts
Receivable for variation margin on open futures contracts (Note 9)
Income Statement Location [Domain]
Entity File Number
Net unrealized appreciation (depreciation)
Entity Emerging Growth Company
Document Type
Cost of short-term investments
Entity Small Business
Entity Shell Company
Document Information [Line Items]
Document Information [Table]
Percentage of net asset value
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.
Entity Filer Category
Entity Current Reporting Status
U.S. Treasury bills, face amount
Entity Tax Identification Number
us-gaap_IncreaseDecreaseInBrokerageReceivables
Receivable for variation margin on open futures contracts
Entity Central Index Key
Entity Registrant Name
Entity [Domain]
Legal Entity [Axis]
Statement [Table]
Entity Address, Address Line One
Statement of Financial Position [Abstract]
Entity Address, City or Town
Entity Address, Postal Zip Code
Net increase (decrease) in net assets per Share (in dollars per share)
Entity Address, State or Province
Sponsor’s fees payable
Statement of Cash Flows [Abstract]
Investment Holdings, Schedule of Investments [Text Block]
Entity Common Stock, Shares Outstanding
Statement of Stockholders' Equity [Abstract]
Income Statement [Abstract]
US Treasury Bill Securities [Member]
Investments [Domain]
Trading Symbol
Investment Type [Axis]
Local Phone Number
Brokerage commissions and fees
us-gaap_TableTextBlock
Notes Tables
Financial Highlights [Table Text Block]
Tabular disclosure of financial highlights.
Net investment income (loss) (in dollars per share)
Net investment income (loss) per share during the period.
Cash Flows from Financing Activities
Net realized and unrealized gain (loss) (in dollars per share)
Net realized and unrealized gain (loss) per share during the period.
gsg_NetIncreaseDecreaseInNetAssetsFromOperationsPerShare
Net increase (decrease) in net assets from operations (in dollars per share)
Net increase (decrease) in net assets from operations per Share during the period.
Ratio to average net assets:
This item represents the header for the ration to average net assets.
Shares issued (in shares)
gsg_NetInvestmentGainLossToAverageNetAssetsRatio
Net investment income (loss)
Ratio of net investment gain (loss) to average net assets.
Receivable for Variation Margin on Open Futures Contracts [Member]
This item represents the r?c?ivabl? for variation margin on op?n futur?s contracts.
Payable for Variation Margin on Open Futures Contracts [Member]
This item represents the payabl? for variation margin on op?n futur?s contracts.
Sponsor's fees
Net Change in Unrealized Appreciation Depreciation on Futures Contracts [Member]
This item represents amounts included in the net change in unrealized appreciation/depreciation on futures contracts on the statement of operations.
Derivative Instruments, Gain (Loss) [Table Text Block]
Change in operating assets and liabilities:
us-gaap_DisclosureTextBlockAbstract
Notes to Financial Statements
Derivative Instruments and Hedging Activities Disclosure [Text Block]
Class of Stock [Axis]
Cash
Net change in unrealized appreciation/depreciation
Net change in unrealized appreciation/depreciation