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Condensed Statements of Cash Flows - USD ($)
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Cash Flows from Operating Activities:    
Net income (loss) $ (152,251,627) $ (25,187,996)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Change in unrealized (gain) loss on open commodity futures contracts 2,115,554 30,374,062
(Increase) decrease in dividends receivable 136,878 8,143
(Increase) decrease in interest receivable (45) 1,841
(Increase) decrease in prepaid insurance [1] (19,834) (7,104)
(Increase) decrease in prepaid registration fees 281,400 (461,476)
(Increase) decrease in ETF transaction fees receivable 1,000 1,000
Increase (decrease) in General Partner management fees payable (42,132) (29,620)
Increase (decrease) in professional fees payable (230,352) (237,165)
Increase (decrease) in brokerage commissions payable 123,977 0
Increase (decrease) in directors' fees payable [1] (5,732) (344)
Increase (decrease) in license fees payable 7,163 (3,480)
Net cash provided by (used in) operating activities (154,114,858) (56,290,263)
Cash Flows from Financing Activities:    
Addition of partnership shares 602,167,708 533,947,245
Redemption of partnership shares (564,300,356) (543,775,338)
Net cash provided by (used in) financing activities 37,867,352 (9,828,093)
Net Increase (Decrease) in Cash and Cash Equivalents (116,247,506) (66,118,356)
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of period 458,998,451 359,791,174
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of period $ 342,750,945 $ 293,672,818
[1] Certain prior year amounts have been reclassified for consistency with the current presentation.