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Condensed Statements of Cash Flows - USD ($)
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash Flows from Operating Activities:    
Net income (loss) $ 238,518,329 $ (152,251,627)
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 (44,687,969) (2,115,554)
(Increase) decrease in dividends receivable (3,545) 136,878
(Increase) decrease in interest receivable 8,270 (45)
(Increase) decrease in prepaid insurance [1] (14,408) (19,834)
(Increase) decrease in prepaid registration fees 103,290 281,400
(Increase) decrease in ETF transaction fees receivable 1,000 1,000
Increase (decrease) in General Partner management fees payable (65,274) (42,132)
Increase (decrease) in professional fees payable (148,944) (230,352)
Increase (decrease) in brokerage commissions payable 19,727 123,977
Increase (decrease) in directors' fees payable [1] (729) (5,732)
Increase (decrease) in license fees payable (4,799) 7,163
Net cash provided by (used in) operating activities 193,724,948 (154,114,858)
Cash Flows from Financing Activities:    
Addition of partnership shares 171,545,597 602,167,708
Redemption of partnership shares (421,529,581) (564,300,356)
Net cash provided by (used in) financing activities (249,983,984) 37,867,352
Net Increase (Decrease) in Cash and Cash Equivalents (56,259,036) (116,247,506)
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of period 440,482,567 458,998,451
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of period $ 384,223,531 $ 342,750,945
[1] Certain prior year amounts have been reclassified for consistency with the current presentation.