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Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Cash flows from operating activities:      
Net Income (Loss) $ 210,394,674 $ 60,577,234 $ (67,969,260)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:      
Cost of securities purchased (536,666,095) (1,077,203,551) (1,643,746,028)
Proceeds from securities sold and matured 650,000,000 1,325,000,074 1,284,011,601
Cost of affiliated investments purchased (1,088,771,837) (1,461,510,451) (3,155,758,046)
Proceeds from affiliated investments sold 934,677,851 1,611,536,659 3,465,598,343
Net accretion of discount on United States Treasury Obligations (16,251,221) (18,883,103) (8,776,905)
Net realized (gain) loss on United States Treasury Obligations (2) (74) (1)
Net change in unrealized (gain) loss on United States Treasury Obligations and Affiliated Investments 96,416 (450,868) 62,103
Change in operating assets and liabilities:      
Variation margin- Commodity Futures Contracts (15,849,265) 9,327,401 (10,364,071)
Dividends from affiliates (190,355) 363,052 (1,750,392)
Management fees 8,340 (305,927) 87,663
Brokerage commissions and fees 1,591 533 (2,866)
Net cash provided by (used in) operating activities 137,450,097 448,450,979 (138,607,859)
Cash flows from financing activities:      
Distributions paid to shareholders (32,099,744) (33,903,924) (5,670,088)
Proceeds from purchases of Shares 148,655,948 133,371,678 1,560,144,663
Redemption of Shares (245,255,151) (543,197,667) (1,415,866,716)
Net cash provided by (used in) financing activities (128,698,947) (443,729,913) 138,607,859
Net change in cash 8,751,150 4,721,066  
Cash at beginning of period 4,721,066    
Cash at end of period 13,472,216 4,721,066  
Supplemental disclosure of cash flow information      
Cash paid for interest $ 206,850 $ 148,839 $ 97,198