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Schedules of Investments (Unaudited) - Investments (Details) (Parentheticals) - USD ($)
Sep. 30, 2025
Dec. 31, 2024
Cost of short-term investments $ 950,835,419 $ 927,149,956
Liabilities percentage of net asset value (0.52%) 0.41%
Total percentage of net asset value 100.00% 100.00%
United States Treasury Bills 4.17% – 4.59% due 1/02/25 [Member]    
U.S. Treasury bills and notes, due date [1],[2]   Jan. 02, 2025
United States Treasury Bills 4.17% – 4.59% due 1/02/25 [Member] | Minimum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   4.17%
United States Treasury Bills 4.17% – 4.59% due 1/02/25 [Member] | Maximum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   4.59%
United States Treasury Bills 4.30% due 10/02/25 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 4.30%  
U.S. Treasury bills and notes, due date [1],[2] Oct. 02, 2025  
United States Treasury Bills 4.34% – 4.62% due 1/07/25 [Member]    
U.S. Treasury bills and notes, due date [1],[2]   Jan. 07, 2025
United States Treasury Bills 4.34% – 4.62% due 1/07/25 [Member] | Minimum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   4.34%
United States Treasury Bills 4.34% – 4.62% due 1/07/25 [Member] | Maximum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   4.62%
United States Treasury Bills 4.31% – 4.33% due 10/07/25 [Member]    
U.S. Treasury bills and notes, due date [1],[2] Oct. 07, 2025  
United States Treasury Bills 4.31% – 4.33% due 10/07/25 [Member] | Minimum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 4.31%  
United States Treasury Bills 4.31% – 4.33% due 10/07/25 [Member] | Maximum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 4.33%  
United States Treasury Bills 4.57% due 1/09/25 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   4.57%
U.S. Treasury bills and notes, due date [1],[2]   Jan. 09, 2025
United States Treasury Bills 4.29% – 4.51% due 1/14/25 [Member]    
U.S. Treasury bills and notes, due date [1],[2]   Jan. 14, 2025
United States Treasury Bills 4.29% – 4.51% due 1/14/25 [Member] | Minimum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   4.29%
United States Treasury Bills 4.29% – 4.51% due 1/14/25 [Member] | Maximum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   4.51%
United States Treasury Bills 4.27% – 4.34% due 10/09/25 [Member]    
U.S. Treasury bills and notes, due date [1],[2] Oct. 09, 2025  
United States Treasury Bills 4.27% – 4.34% due 10/09/25 [Member] | Minimum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 4.27%  
United States Treasury Bills 4.27% – 4.34% due 10/09/25 [Member] | Maximum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 4.34%  
United States Treasury Bills 4.53% due 1/16/25 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   4.53%
U.S. Treasury bills and notes, due date [1],[2]   Jan. 16, 2025
United States Treasury Bills 4.07% – 4.32% due 10/14/25 [Member]    
U.S. Treasury bills and notes, due date [1],[2] Oct. 14, 2025  
United States Treasury Bills 4.07% – 4.32% due 10/14/25 [Member] | Minimum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 4.07%  
United States Treasury Bills 4.07% – 4.32% due 10/14/25 [Member] | Maximum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 4.32%  
United States Treasury Bills 4.61% due 1/21/25 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   4.61%
U.S. Treasury bills and notes, due date [1],[2]   Jan. 21, 2025
United States Treasury Bills 4.30% due 10/16/25 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 4.30%  
U.S. Treasury bills and notes, due date [1],[2] Oct. 16, 2025  
United States Treasury Bills 4.62% due 1/23/25 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   4.62%
U.S. Treasury bills and notes, due date [1],[2]   Jan. 23, 2025
United States Treasury Bills 4.14% – 4.29% due 10/21/25 [Member]    
U.S. Treasury bills and notes, due date [1],[2] Oct. 21, 2025  
United States Treasury Bills 4.14% – 4.29% due 10/21/25 [Member] | Minimum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 4.14%  
United States Treasury Bills 4.14% – 4.29% due 10/21/25 [Member] | Maximum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 4.29%  
United States Treasury Bills 4.48% due 1/28/25 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   4.48%
U.S. Treasury bills and notes, due date [1],[2]   Jan. 28, 2025
United States Treasury Bills 4.22% due 10/28/25 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 4.22%  
U.S. Treasury bills and notes, due date [1],[2] Oct. 28, 2025  
United States Treasury Bills 4.51% due 1/30/25 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   4.51%
U.S. Treasury bills and notes, due date [1],[2]   Jan. 30, 2025
United States Treasury Bills 4.21% due 10/30/25 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 4.21%  
U.S. Treasury bills and notes, due date [1],[2] Oct. 30, 2025  
United States Treasury Bills 4.50% due 2/04/25 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   4.50%
U.S. Treasury bills and notes, due date [1],[2]   Feb. 04, 2025
United States Treasury Bills 4.14% due 11/04/25 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 4.14%  
U.S. Treasury bills and notes, due date [1],[2] Nov. 04, 2025  
United States Treasury Bills 4.35% – 4.47% due 2/06/25 [Member]    
U.S. Treasury bills and notes, due date [1],[2]   Feb. 06, 2025
United States Treasury Bills 4.35% – 4.47% due 2/06/25 [Member] | Minimum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   4.35%
United States Treasury Bills 4.35% – 4.47% due 2/06/25 [Member] | Maximum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   4.47%
United States Treasury Bills 4.18% – 4.24% due 11/06/25 [Member]    
U.S. Treasury bills and notes, due date [1],[2] Nov. 06, 2025  
United States Treasury Bills 4.18% – 4.24% due 11/06/25 [Member] | Minimum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 4.18%  
United States Treasury Bills 4.18% – 4.24% due 11/06/25 [Member] | Maximum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 4.24%  
United States Treasury Bills 4.34% due 2/11/25 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   4.34%
U.S. Treasury bills and notes, due date [1],[2]   Feb. 11, 2025
United States Treasury Bills 4.08% due 11/12/25 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 4.08%  
U.S. Treasury bills and notes, due date [1],[2] Nov. 12, 2025  
United States Treasury Bills 4.50% due 2/13/25 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   4.50%
U.S. Treasury bills and notes, due date [1],[2]   Feb. 13, 2025
United States Treasury Bills 4.30% due 2/18/25 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   4.30%
U.S. Treasury bills and notes, due date [1],[2]   Feb. 18, 2025
United States Treasury Bills 4.22% – 4.23% due 11/13/25 [Member]    
U.S. Treasury bills and notes, due date [1],[2] Nov. 13, 2025  
United States Treasury Bills 4.22% – 4.23% due 11/13/25 [Member] | Minimum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 4.22%  
United States Treasury Bills 4.22% – 4.23% due 11/13/25 [Member] | Maximum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 4.23%  
United States Treasury Bills 4.53% due 2/20/25 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   4.53%
U.S. Treasury bills and notes, due date [1],[2]   Feb. 20, 2025
United States Treasury Bills 4.05% due 11/18/25 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 4.05%  
U.S. Treasury bills and notes, due date [1],[2] Nov. 18, 2025  
United States Treasury Bills 4.29% due 2/25/25 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   4.29%
U.S. Treasury bills and notes, due date [1],[2]   Feb. 25, 2025
United States Treasury Bills 4.23% due 11/20/25 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 4.23%  
U.S. Treasury bills and notes, due date [1],[2] Nov. 20, 2025  
United States Treasury Bills 4.45% – 4.50% due 2/27/25 [Member]    
U.S. Treasury bills and notes, due date [1],[2]   Feb. 27, 2025
United States Treasury Bills 4.45% – 4.50% due 2/27/25 [Member] | Minimum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   4.45%
United States Treasury Bills 4.45% – 4.50% due 2/27/25 [Member] | Maximum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   4.50%
United States Treasury Bills 4.03% – 4.18% due 11/28/25 [Member]    
U.S. Treasury bills and notes, due date [1],[2] Nov. 28, 2025  
United States Treasury Bills 4.03% – 4.18% due 11/28/25 [Member] | Minimum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 4.03%  
United States Treasury Bills 4.03% – 4.18% due 11/28/25 [Member] | Maximum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 4.18%  
United States Treasury Bills 4.46% due 3/06/25 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   4.46%
U.S. Treasury bills and notes, due date [1],[2]   Mar. 06, 2025
United States Treasury Bills 4.11% due 12/04/25 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 4.11%  
U.S. Treasury bills and notes, due date [1],[2] Dec. 04, 2025  
United States Treasury Bills 4.35% due 3/13/25 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   4.35%
U.S. Treasury bills and notes, due date [1],[2]   Mar. 13, 2025
United States Treasury Bills 3.92% – 4.04% due 12/11/25 [Member]    
U.S. Treasury bills and notes, due date [1],[2] Dec. 11, 2025  
United States Treasury Bills 3.92% – 4.04% due 12/11/25 [Member] | Minimum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 3.98%  
United States Treasury Bills 3.92% – 4.04% due 12/11/25 [Member] | Maximum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 4.04%  
United States Treasury Bills 4.34% due 3/20/25 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   4.34%
U.S. Treasury bills and notes, due date [1],[2]   Mar. 20, 2025
United States Treasury Bills 3.98% due 12/18/25 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 3.98%  
U.S. Treasury bills and notes, due date [1],[2] Dec. 18, 2025  
US Treasury Bill Securities [Member]    
Cost of short-term investments [1],[2] $ 999,173,257 $ 963,373,422
Percentage of net asset value 100.52% 99.59%
United States Treasury Bills 3.92% due 1/06/26 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 3.92%  
U.S. Treasury bills and notes, due date [1],[2] Jan. 06, 2026  
United States Treasury Bills 3.92% due 1/13/26 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 3.92%  
U.S. Treasury bills and notes, due date [1],[2] Jan. 13, 2026  
United States Treasury Bills 3.94% due 1/20/26 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 3.94%  
U.S. Treasury bills and notes, due date [1],[2] Jan. 20, 2026  
[1] A portion of the above U.S. Treasury bills are posted as margin for the Trust’s Index Futures positions as described in Note 2D.
[2] Rates shown are discount rates paid at the time of purchase.