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Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash Flows from Operating Activities:      
Net income (loss) $ (202,815,769) $ (77,617,254) $ 110,037,462
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 (6,313,791) (46,252,567) 122,742,937
(Increase) decrease in dividends receivable 140,084 (62,127) (61,099)
(Increase) decrease in interest receivable (8,959) 4,443 1,903
(Increase) decrease in prepaid insurance [1] (6,015) 635 (3,646)
(Increase) decrease in prepaid registration fees 364,200 (392,476) 83,258
(Increase) decrease in ETF transaction fees receivable 0 0 1,000
Increase (decrease) in General Partner management fees payable 4,957 26,513 (131,834)
Increase (decrease) in professional fees payable (122,717) (77,219) (28,822)
Increase (decrease) in brokerage commissions payable 107,693 0 (36,500)
Increase (decrease) in directors' fees payable [1] (5,124) 2,089 (4,301)
Increase (decrease) in license fees payable 8,180 (2,045) (8,116)
Net cash provided by (used in) operating activities (208,647,261) (124,370,008) 232,592,242
Cash Flows from Financing Activities:      
Addition of partnership shares 1,003,414,098 914,876,988 1,744,841,011
Redemption of partnership shares (813,282,721) (691,299,703) (2,269,580,373)
Net cash provided by (used in) financing activities 190,131,377 223,577,285 (524,739,362)
Net Increase (Decrease) in Cash and Cash Equivalents (18,515,884) 99,207,277 (292,147,120)
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of year 458,998,451 359,791,174 651,938,294
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of year $ 440,482,567 $ 458,998,451 $ 359,791,174
[1] Certain prior year amounts have been reclassified for consistency with the current presentation.