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Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Cash Flows from Operating Activities        
Net increase in net assets resulting from operations $ (36,143,954) $ 4,499,014 $ 9,414,990 $ 96,838,770
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     (3,115,374,791) (2,724,069,646)
Sales/maturities of short-term investments     3,135,976,753 2,622,172,455
Accretion of discount     (20,955,137) (27,093,638)
Net realized loss on short-term investments 2,912 11 (2,155) (204)
Net change in unrealized appreciation/depreciation on short-term investments (39,445) (324,741) 226,399 99,714
Change in operating assets and liabilities:        
Receivable for variation margin on open futures contracts     3,037,571 0
Payable for variation margin on open futures contracts     4,437,061 (1,893,774)
Sponsor’s fees payable     (14,681) 48,609
Net cash provided by (used in) operating activities     16,746,010 (33,897,714)
Cash Flows from Financing Activities        
Contributions for Shares issued     189,336,397 168,807,276
Distributions for Shares redeemed     (206,896,652) (135,178,020)
Net cash provided by (used in) financing activities     (17,560,255) 33,629,256
Net increase (decrease) in cash     (814,245) (268,458)
Cash        
Beginning of period, Unrestricted – cash     1,502,280 2,435,084
End of period, Unrestricted – cash $ 688,035 $ 2,166,626 $ 688,035 $ 2,166,626