75000 - Document - Document and Entity Information link:presentationLink link:calculationLink link:definitionLink 75010 - Statement - Statements of Financial Condition (Unaudited) link:presentationLink link:calculationLink link:definitionLink 75020 - Statement - Statements of Financial Condition (Unaudited) (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 75030 - Statement - Schedule of Investments (Unaudited) - Treasury Bills and Money Market Fund link:presentationLink link:calculationLink link:definitionLink 75030 - Statement - Schedule of Investments (Unaudited) - Treasury Bills and Money Market Fund [Default] link:presentationLink link:calculationLink link:definitionLink 75040 - Statement - Schedule of Investments (Unaudited) - Futures Contracts link:presentationLink link:calculationLink link:definitionLink 75040 - Statement - Schedule of Investments (Unaudited) - Futures Contracts [Default] link:presentationLink link:calculationLink link:definitionLink 75050 - Statement - Statements of Income and Expenses (Unaudited) link:presentationLink link:calculationLink link:definitionLink 75060 - Statement - Statements of Changes in Shareholders' Equity (Unaudited) link:presentationLink link:calculationLink link:definitionLink 75070 - Statement - Statements of Cash Flows (Unaudited) link:presentationLink link:calculationLink link:definitionLink 995455 - Disclosure - Organization link:presentationLink link:calculationLink link:definitionLink 995465 - Disclosure - Summary of Significant Accounting Policies link:presentationLink link:calculationLink link:definitionLink 995475 - Disclosure - Financial Instrument Risk link:presentationLink link:calculationLink link:definitionLink 995485 - Disclosure - Service Providers and Related Party Agreements link:presentationLink link:calculationLink link:definitionLink 995495 - Disclosure - Deposits with Commodity Broker and Custodian link:presentationLink link:calculationLink link:definitionLink 995505 - Disclosure - Additional Valuation Information link:presentationLink link:calculationLink link:definitionLink 995515 - Disclosure - Derivative Instruments link:presentationLink link:calculationLink link:definitionLink 995525 - Disclosure - Investments in Affiliates link:presentationLink link:calculationLink link:definitionLink 995535 - Disclosure - Share Purchases and Redemptions link:presentationLink link:calculationLink link:definitionLink 995545 - Disclosure - Commitments and Contingencies link:presentationLink link:calculationLink link:definitionLink 995555 - Disclosure - Financial Highlights link:presentationLink link:calculationLink link:definitionLink 995565 - Disclosure - Summary of Significant Accounting Policies (Policies) link:presentationLink link:calculationLink link:definitionLink 995575 - Disclosure - Additional Valuation Information (Tables) link:presentationLink link:calculationLink link:definitionLink 995585 - Disclosure - Derivative Instruments (Tables) link:presentationLink link:calculationLink link:definitionLink 995595 - Disclosure - Investments in Affiliates (Tables) link:presentationLink link:calculationLink link:definitionLink 995605 - Disclosure - Financial Highlights (Tables) link:presentationLink link:calculationLink link:definitionLink 995615 - Disclosure - Organization - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 995625 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 995635 - Disclosure - Service Providers and Related Party Agreements - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 995645 - Disclosure - Deposits with Commodity Broker and Custodian - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 995655 - Disclosure - Additional Valuation Information - Summary of the Tiered Valuation Input Levels (Detail) link:presentationLink link:calculationLink link:definitionLink 995665 - Disclosure - Derivative Instruments - Fair Value of Derivative Instruments (Detail) link:presentationLink link:calculationLink link:definitionLink 995675 - Disclosure - Derivative Instruments - Effect of Derivative Instruments on Statements of Income and Expenses (Detail) link:presentationLink link:calculationLink link:definitionLink 995685 - Disclosure - Derivative Instruments - Summary of Average Monthly and Quarterly Notional Value of Future Contracts Held (Detail) link:presentationLink link:calculationLink link:definitionLink 995695 - Disclosure - Investments in Affiliates - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 995705 - Disclosure - Investments in Affiliates - Summary of Transactions in, and Earnings from, Investments in Affiliates (Detail) link:presentationLink link:calculationLink link:definitionLink 995715 - Disclosure - Share Purchases and Redemptions - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 995725 - Disclosure - Financial Highlights - Schedule of Net Asset Value Per Share (Detail) link:presentationLink link:calculationLink link:definitionLink General Partners' Capital Account, Units Outstanding General Shares outstanding General shares, shares issued Investment company realized gain loss on investment. Investment Company Realized Gain Loss On Investment [Abstract] Net Realized Gain (Loss) on Dividend Income, Operating Dividends from Affiliates Dividend Income, Operating, Total Dividend Income Financial instruments owned money market mutual fund at fair value. Financial Instruments Owned Money Market Mutual Fund At Fair Value Money Market Mutual Fund Commissions, Policy [Policy Text Block] Brokerage Commissions and Fees Limited Partners' Capital Account, Units Outstanding Shares outstanding Commitments and Contingencies Commitments and Contingencies (Note 10) Commodity Contract [Member] Commodity Futures Contract [Member] Not Designated as Hedging Instrument [Member] Not Designated as Hedging Instrument [Member] Minimum [Member] Minimum [Member] Floor Brokerage, Exchange and Clearance Fees Brokerage Commissions and Fees Floor Brokerage, Exchange and Clearance Fees, Total Investment Company, Contractual Fee Waived Managing owner waived fees Less: Waivers Consolidated Entities [Domain] Consolidated Entities Dividends Receivable Dividends from affiliates Investment Securities, Unrecognized Unrealized Appreciation (Depreciation), Net Investment securities, unrecognized unrealized appreciation (depreciation), net. Commodity Futures Contracts US Treasury Bill Securities [Member] US Treasury Bill Securities [Member] Stockholders equity period increase (decrease) due to share transactions. Stockholders Equity Period Increase Decrease Due To Share Transactions Net Increase (Decrease) due to Share Transactions, value Investment Owned, Face Amount United States Treasury Obligations, Principal Value Commodity Futures Contracts, Notional Value Investment Company, General Partner, Advisory Service Expense Management Fees Increase (Decrease) in Payable to Broker-Dealer and Clearing Organization Brokerage commissions and fees Investment Maturity Date Investment Maturity Date Distributed Earnings Distributed earnings Distributed Earnings, Total Income Statement [Abstract] Total Other Investments Financial Instruments Owned Investment Total Commodity Futures Contracts Financial Instruments Owned Investment Total Commodity Futures Contracts. Total Other Investments Proceeds from Sale of Securities, Operating Activities Proceeds from securities sold and matured Increase (Decrease) in Dividends Receivable Dividends from affiliates Variation margin receivable- Commodity Futures Contracts Receivables from Clearing Organizations Document Period End Date Document Period End Date Investment Owned, Balance, Shares Investments in Securities, Shares Investment Company, Financial Ratios [Abstract] Ratio to average Net Assets Statement of Stockholders' Equity [Abstract] Schedule of Investments [Abstract] Investments [Domain] Investments Assets Total assets Title of 12(b) Security Title of 12(b) Security Investment Company, Fee Waiver Terms Fees waiver terms Payments for Repurchase of Common Stock Redemption of Shares Broker-Dealer [Abstract] Interest Paid, Excluding Capitalized Interest, Operating Activity Cash paid for interest Investment Company, Investment Income (Loss), Per Share, Basic Net investment income (loss) Cash and Cash Equivalents [Domain] Cash and Cash Equivalents Interest Expense, Operating Interest Expense, Operating, Total Interest Expense Cash Cash held by Custodian Equity, Attributable to Parent Balance - Value Balance - Value Total shareholders' equity Investment, Issuer Affiliation [Domain] Entity Address, Address Line Two Entity Address, Address Line Two Management Fee Payable Management fees Derivative Instruments, Gain (Loss) [Table] Derivative Instruments Gain Loss By Hedging Relationship By Income Statement Location By Derivative Instrument Risk [Table] Basis of Accounting, Policy [Policy Text Block] Basis of Presentation Investments in and Advances to Affiliates [Table Text Block] Summary of Transactions in, and Earnings from, Investments in Affiliates Proceeds from affiliated investments sold. Proceeds From Affiliated Investments Sold Proceeds from affiliated investments sold Investments valuation. Investment Valuations Policy [Text Block] Investment Valuations Statistical Measurement [Axis] Statistical Measurement Entity Interactive Data Current Entity Interactive Data Current Liabilities Total liabilities Other Investments [Abstract] Other investments: United States Treasury Obligations United States Treasury Obligations, Value United States Treasury Obligations, at value (cost $58,762,747 and $39,815,185, respectively) Number of shares issued per creation unit. Number Of Shares Issued Per Creation Unit Number of shares issued per Creation Unit Fair Value, Inputs, Level 3 [Member] Level 3 [Member] Text Block [Abstract] Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] Summary of Average Monthly Notional Value of Future Contracts Held Operating Expenses Total Expenses Routine operational administrative and other ordinary expenses. Routine Operational Administrative And Other Ordinary Expenses Policy Policy [Text Block] Routine Operational, Administrative And Other Ordinary Expenses Revenues [Abstract] Income Investment Company, Gain (Loss) on Investment, Per Share Net realized and change in unrealized gain (loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Organization Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Change in operating assets and liabilities: Stock Issued During Period, Shares, New Issues Purchases of Shares - Shares Increase (decrease) in payable for amount due to custodian Increase Decrease In Payable For Amount Increase (decrease) in payable for amount due to custodian. Marketable Security, Unrealized Gain (Loss) United States Treasury Obligations Change in Unrealized Appreciation (Depreciation) Investment Company, Investment Income (Loss) Ratio Net investment income (loss) Treasury obligation measurement maximum maturity period. Treasury Obligation Measurement Maximum Maturity Period Treasury obligation measurement maximum maturity period Average net assets to expenses prior to waivers. Average Net Assets To Expenses Prior To Waivers Expenses, prior to waivers Increase (Decrease) in Accounts Payable, Related Parties Management fees Related Party Transactions [Abstract] Investment Company, Financial Highlights [Table Text Block] Schedule of Net Asset Value Per Share Income Tax, Policy [Policy Text Block] Income Taxes Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV Gain (Loss), Investment and Derivative, Operating, and Foreign Currency Transaction, before Tax Net Realized and Net Change in Unrealized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts Investment Owned, Net Assets, Percentage Percentage of Shareholders' Equity Partner Type [Axis] Partner Type Investments in and Advances to Affiliates, at Fair Value, Gross Additions Purchases at Cost Derivative [Line Items] Derivative [Line Items] Investment Owned, Balance, Contracts Commodity Futures Contracts, Number of Contracts Payments for (Proceeds from) Investments Proceeds from Sales Payments for (Proceeds from) Investments, Total Liabilities and Equity Total liabilities and equity Nontrade Receivables, Unclassified [Abstract] Receivable for: Document Fiscal Period Focus Document Fiscal Period Focus Derivatives, Fair Value [Line Items] Derivatives Fair Value [Line Items] Entity Current Reporting Status Entity Current Reporting Status Use of Estimates, Policy [Policy Text Block] Accounting Estimates Fair Value, Inputs, Level 1 [Member] Level 1 [Member] Investment Company, Financial Highlights [Text Block] Financial Highlights Management fee percentage per annum of daily NAV Management Fee Per Annum Of Daily Net Assets Management fee per annum of daily net assets. Net Realized Gain (Loss) Realized Investment Gains (Losses) Investment Type [Axis] Investment Type Financial Instrument [Axis] Interest Income, Operating Interest Income Interest Income, Operating, Total Document Transition Report Document Transition Report Increase (Decrease) in Deposit Assets Increase (Decrease) in Deposit Assets, Total Deposit with Commodity Broker Commitments and Contingencies Disclosure [Abstract] Gain (Loss) on Sale of Investments Realized Gain (Loss) Gain (Loss) on Sale of Investments, Total Investment Company, Investment Income (Loss) from Operations, Per Share Net income (loss) Derivative Instruments and Hedging Activities Disclosure [Text Block] Derivative Instruments Statistical Measurement [Domain] Statistical Measurement Assets [Abstract] Assets Due to Custodian Due to custodian. Due to Custodian Entity Central Index Key Entity Central Index Key Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives Balance Sheet Location By Derivative Contract Type By Hedging Designation [Table] US Treasury and Government [Member] 'United States Treasury Obligations [Member] Unrealized Gain (Loss) on Commodity Contracts Commodity Futures Contracts Futures Contracts, Net Unrealized Gain (Loss) Forward Contract Indexed to Issuer's Equity, Settlement Date Commodity Futures Contracts, Expiration Date Current Fiscal Year End Date Current Fiscal Year End Date Average charges paid to broker per round turn trade maximum. Average Charges Paid To Broker Per Round Turn Trade Maximum Average charges paid to broker per round-turn trade, maximum Derivative [Table] Derivative [Table] Document Quarterly Report Document Quarterly Report Realized gain (loss) on marketable securities and affiliated investments. Realized Gain Loss On Marketable Securities And Affiliated Investments Net realized (gain) loss on United States Treasury Obligations and Affiliated Investments Investments in and Advances to Affiliates [Table] Investments In And Advances To Affiliates [Table] Entity Address, Address Line Three Entity Address, Address Line Three Cash and Cash Equivalents [Axis] Cash and Cash Equivalents Fair Value, Inputs, Level 2 [Member] Level 2 [Member] Unrealized Gain (Loss) on Investments Net Change in Unrealized Gain (Loss) Rule 10b5-1 Arrangement [Flag] Rule 10b5-1 arrangement modified flag. Rule 10b5-1 Arrangement Modified Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Net cash provided by (used in) operating activities Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Net Income (Loss) Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies Non recurring and unusual fees and expenses. Non Recurring And Unusual Fees And Expenses Policy [Text Block] Non-Recurring Fees And Expenses Payments for Purchase of Securities, Operating Activities Cost of securities purchased Increase decrease in variation margin. Increase Decrease In Variation Margin Variation margin- Commodity Futures Contracts Stock Issued During Period, Shares, Period Increase (Decrease) Net Change in Shareholders' Equity, shares Net Income (Loss), Including Portion Attributable to Noncontrolling Interest [Abstract] Net Income (Loss) Investment, Tax Basis, Unrealized Gain (Loss) Commodity Futures Contracts, Unrealized Appreciation (Depreciation) Tax Basis of Investments, Unrealized Appreciation (Depreciation), Net, Total Investment Company, Total Return Total Return, at net asset value Gain (Loss) on Investments Future Contracts, Net Realized and Unrealized Gain (Loss) Unrealized gain loss on marketable securities affiliated investments and derivatives and LME commodity contracts. Unrealized Gain Loss On Marketable Securities Affiliated Investments And Derivatives And L M E Commodity Contracts Net change in unrealized (gain) loss on United States Treasury Obligations and Affiliated Investments Profit and loss allocations and distributions. Profit And Loss Allocations And Distributions Policy [Text Block] Profit and Loss Allocations and Distributions Statement of Cash Flows [Abstract] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV Non-Rule 10b5-1 Arrangement [Flag] Non-rule 10b5-1 arrangement modified flag. Non-Rule 10b5-1 Arrangement Modified Schedule of Investments [Line Items] Schedule of Investments [Line Items] Summary of the Tiered Valuation Input Levels Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Fair Value Disclosures [Text Block] Additional Valuation Information Investment Interest Rate Investment Interest Rate Number of series of trusts. Number Of Series Of Trusts Number of series of trusts Derivative Contract [Domain] Derivative Contract Number of Operating Segments Segment Reporting Segment Reporting, Policy [Policy Text Block] Increase (Decrease) in Payable for Investment Purchased Investments purchased Financial instruments owned exchange traded fund. Financial Instruments Owned Exchange Traded Fund Exchange-Traded Fund Hedging Designation [Axis] Hedging Designation Hedging Designation Hedging Designation [Domain] Net asset value per share Net Asset Value Per Share Net asset value per Share, end of period Net asset value per Share, beginning of period Document Type Document Type Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Cash flows from operating activities: Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration] Investments in and Advances to Affiliates, Schedule of Investments [Abstract] Accounting Standards Update [Extensible Enumeration] Operating Income (Loss) Net Investment Income (Loss) Net Investment Income (Loss) Investment company contractual fee waiver termination period. Investment Company Contractual Fee Waiver Termination Period Investment company contractual fee waiver termination period Increase (decrease) in payable for amount due to custodian Increase (Decrease) in payable for amount due to custodians Increase (Decrease) in payable for amount due to custodian. Market value per share. Market Value Per Share Market value per Share, end of period Market value per Share, beginning of period Market value per share Stock Redeemed or Called During Period, Value Redemption of Shares - Value Securities Act File Number Entity File Number Open Futures Contract, Identifier [Axis] Investment, Issuer Affiliation [Axis] Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] Investment in Debt and Equity Securities and Other Trading Assets [Text Block] Financial Instrument Risk Entity Registrant Name Entity Registrant Name Accounting Policies [Abstract] Partners' Capital Account, Units Balance - Shares Balance - Shares Entity Address, Address Line One Entity Address, Address Line One Commission Payable to Broker-Dealer and Clearing Organization Brokerage commissions and fees Fair Value, Recurring and Nonrecurring [Table] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Derivatives, Policy [Policy Text Block] Commodity Futures Contracts Supplemental Cash Flow Information [Abstract] Supplemental disclosure of cash flow information Return at market value. Return At Market Value Total Return, at market value Related Party Transactions Disclosure [Text Block] Service Providers and Related Party Agreements Commodity Futures Contracts Gain (Loss) on Sale of Commodity Contracts Futures contracts, realized gain (loss) Entity Small Business Entity Small Business Treasury Obligation Measurement Minimum Maturity Period Treasury obligation measurement minimum maturity period. Treasury obligation measurement minimum maturity period Significant Accounting Policies [Text Block] Summary of Significant Accounting Policies Average notional value of derivative. Average Notional Value Of Derivative Average Notional Value Earnings Per Share [Abstract] Investment, Policy [Policy Text Block] Investment Transactions and Investment Income Investment, Affiliated Issuer [Member] Investment, Affiliated Issuer [Member] Affiliated Investments [Member] Partners' Capital [Abstract] Equity Equity [Abstract] Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Cash flows from financing activities: Consolidated Entities [Axis] Consolidated Entities Financial Instruments, Owned, at Fair Value Total Investments Liabilities [Abstract] Liabilities Minimum number of creation units of shares that can be redeemed. Minimum Number Of Creation Units Of Shares That Can Be Redeemed Minimum number of Creation Units that can be redeemed Interest and Dividend Income, Operating Total Income Entity Tax Identification Number Entity Tax Identification Number Derivative Instrument [Axis] Derivative Instrument Entity Address, City or Town Entity Address, City or Town Stock Redeemed or Called During Period, Shares Redemption of Shares - Shares Stock Issued During Period, Value, New Issues Purchases of Shares - Value Exchange Traded Funds [Member] Exchange Traded Funds [Member] Exchange Traded Funds [Member] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Segment Reporting, Expense Information Used by CODM, Description Segment Reporting, Expense Information Used by CODM, Description Derivative Asset, Subject to Master Netting Arrangement, before Offset Assets Statement [Table] Statement [Table] Affiliated Entity [Member] Affiliated Investments [Member] Entity Shell Company Entity Shell Company Statement [Line Items] Statement [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] Maximum [Member] Maximum [Member] Investment Owned, Cost Investments in Securities, cost Investments in Securities, Cost Investments in and Advances to Affiliates, Schedule of Investments [Text Block] Investments in Affiliates General Partner [Member] General Shares [Member] Partner Type of Partners' Capital Account, Name [Domain] Partner Type of Partners' Capital Account, Name Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Excluding Exchange Rate Effect, Including Discontinued Operation Net change in cash Minimum number of creation units of shares that can be purchased. Minimum Number Of Creation Units Of Shares That Can Be Purchased Minimum number of Creation Units that can be purchased Investments, Debt and Equity Securities [Abstract] Unrealized gain (loss) on marketable securities and affiliated investments. Unrealized Gain Loss On Marketable Securities And Affiliated Investments Net change in unrealized (gain) loss on United States Treasury Obligations and Affiliated Investments Stock issued during period shares period increase decrease due to share transactions. Stock Issued During Period Shares Period Increase Decrease Due To Share Transactions Net Increase (Decrease) due to Share Transactions, shares Good Faith and Margin Deposit with Broker-Dealer Restricted for maintenance margin Deposit with Commodity Broker Document Fiscal Year Focus Document Fiscal Year Focus Financial Instruments [Domain] Commodity Futures Contracts Financial Instruments Owned Investment Commodity Futures Contracts Liabilities Financial Instruments Owned Investment Commodity Futures Contracts Liabilities. Commodity Futures Contracts Investment Company, Expense Ratio, after Voluntary Fee Waiver Deduction Expenses, after waivers Change in Accounting Principle, Accounting Standards Update, Adopted [true false] Net Change in Marketable Securities Unrealized Gain Loss Excluding Other Than Temporary Impairments Net change in marketable securities unrealized gain loss excluding other than temporary impairments. Net Change in Unrealized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts Security Exchange Name Security Exchange Name Entity Address, State or Province Entity Address, State or Province Share purchases and redemptions disclosure. Share Purchases And Redemptions Disclosure [Text Block] Share Purchases And Redemptions Amendment Flag Amendment Flag Cash at end of period Cash at beginning of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Total City Area Code City Area Code General Partners' Capital Account Shareholder's equity—General Shares General Partners' Capital Account, Total Unrecognized Tax Benefits Unrecognized tax benefit Unrecognized Tax Benefits, Beginning Balance Unrecognized Tax Benefits, Ending Balance Organization, Consolidation and Presentation of Financial Statements [Abstract] Derivatives Not Designated as Hedging Instruments [Table Text Block] Fair Value of Derivative Instruments and Effect of Derivative Instruments on Statements of Income and Expenses Proceeds from Issuance of Common Stock Proceeds from purchases of Shares Marketable Security, Realized Gain (Loss) Net Realized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Commodity Futures Contracts Investment, Identifier [Axis] Schedule of Investments [Table] Schedule Of Investments [Table] Cost of affiliated investments purchased. Cost Of Affiliated Investments Purchased Cost of affiliated investments purchased Operating Expenses [Abstract] Expenses Investment company unrealized gain loss on investment. Investment Company Unrealized Gain Loss On Investment [Abstract] Net Change in Unrealized Gain (Loss) on Unrealized gain (loss) on affiliated investments. Unrealized Gain Loss On Affiliated Investments Affiliated Investments US Government Corporations and Agencies Securities [Member] Invesco Government & Agency Portfolio, Institutional Class [Member] Depreciation, Amortization and Accretion, Net Net accretion of discount on United States Treasury Obligations Depreciation, Amortization and Accretion, Net, Total Derivative Instruments and Hedging Activities Disclosure [Abstract] Trading Symbol Trading Symbol Entity Emerging Growth Company Entity Emerging Growth Company Cover [Abstract] Stockholders' Equity, Period Increase (Decrease) Net Change in Shareholders' Equity, value Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: Fair Value Disclosures [Abstract] Due to and from Broker-Dealers and Clearing Organizations Disclosure [Text Block] Deposits with Commodity Broker and Custodian Limited Partner [Member] Shares [Member] Broker-Dealer, Payable to Other Broker-Dealer and Clearing Organization [Abstract] Payable for: Operating Cash Flows, Direct Method [Abstract] Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Net cash provided by (used in) financing activities Cash Equivalents, at Carrying Value Cash equivalents held by fund Cash Equivalents, at Carrying Value, Total Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments Gain Loss [Line Items] Entity Filer Category Entity Filer Category Investment Company, Financial Highlights [Abstract] Net Asset Value Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description Limited Partners' Capital Account Shareholders' equity—Shares Limited Partners' Capital Account, Total Total Investments in Securities Beginning Value Ending Value Investments in Securities, Value Commodity Futures Contracts, Value Affiliated investments, at value (cost $221,624,246 and $145,529,042, respectively) Operating expenses net. Operating Expenses Net Net Expenses Derivative Liability, Subject to Master Netting Arrangement, before Offset Liabilities Entity Address, Postal Zip Code Entity Address, Postal Zip Code Statement of Financial Position [Abstract] Local Phone Number Local Phone Number