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Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Cash Flows from Operating Activities        
Net increase in net assets resulting from operations $ 38,642,473 $ (59,879,999) $ 48,057,463 $ 36,958,771
Adjustments to reconcile net increase (decrease) in net assets resulting from operations to net cash provided by (used in) operating activities:        
Purchases of short-term investments     (5,188,864,448) (3,775,956,226)
Sales/maturities of short-term investments     5,184,854,412 3,906,743,937
Accretion of discount     (31,786,399) (40,105,867)
Net realized loss on short-term investments (1,244) (1,222) (3,399) (1,426)
Net change in unrealized appreciation/depreciation on short-term investments (62,780) 71,699 163,619 171,413
Change in operating assets and liabilities:        
Receivable for variation margin on open futures contracts     3,037,571 (2,735,539)
Payable for variation margin on open futures contracts     8,121,169 (5,873,212)
Payable for investment securities purchased     0 2,098,511
Sponsor’s fees payable     11,239 (90,199)
Net cash provided by (used in) operating activities     23,591,227 121,210,163
Cash Flows from Financing Activities        
Contributions for Shares issued     267,867,132 176,152,666
Distributions for Shares redeemed     (292,839,628) (299,782,860)
Net cash provided by (used in) financing activities     (24,972,496) (123,630,194)
Net decrease in cash     (1,381,269) (2,420,031)
Cash        
Beginning of period, Unrestricted – cash     1,502,280 2,435,084
End of period, Unrestricted – cash $ 121,011 $ 15,053 $ 121,011 $ 15,053