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Schedules of Investments (Unaudited) - Investments (Details) (Parentheticals) - USD ($)
Mar. 31, 2026
Dec. 31, 2025
Cost of short-term investments $ 954,008,649 $ 1,040,196,644
Liabilities percentage of net asset value (4.11%) (1.07%)
Total percentage of net asset value 100.00% 100.00%
United States Treasury Bills 3.66% – 3.68% due 4/02/26 [Member]    
U.S. Treasury bills and notes, due date [1],[2] Apr. 02, 2026  
United States Treasury Bills 3.66% – 3.68% due 4/02/26 [Member] | Minimum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 3.66%  
United States Treasury Bills 3.66% – 3.68% due 4/02/26 [Member] | Maximum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 3.68%  
United States Treasury Bills 3.92% – 3.94% due 1/02/26 [Member]    
U.S. Treasury bills and notes, due date [1],[2]   Jan. 02, 2026
United States Treasury Bills 3.92% – 3.94% due 1/02/26 [Member] | Minimum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   3.92%
United States Treasury Bills 3.92% – 3.94% due 1/02/26 [Member] | Maximum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   3.94%
United States Treasury Bills 3.60% – 3.69% due 4/07/26 [Member]    
U.S. Treasury bills and notes, due date [1],[2] Apr. 07, 2026  
United States Treasury Bills 3.60% – 3.69% due 4/07/26 [Member] | Minimum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 3.60%  
United States Treasury Bills 3.60% – 3.69% due 4/07/26 [Member] | Maximum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 3.69%  
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 3.88% – 3.94% due 1/08/26 [Member]    
U.S. Treasury bills and notes, due date [1],[2]   Jan. 08, 2026
United States Treasury Bills 3.88% – 3.94% due 1/08/26 [Member] | Minimum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   3.88%
United States Treasury Bills 3.88% – 3.94% due 1/08/26 [Member] | Maximum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   3.94%
United States Treasury Bills 3.66% – 3.68% due 4/09/26 [Member]    
U.S. Treasury bills and notes, due date [1],[2] Apr. 09, 2026  
United States Treasury Bills 3.66% – 3.68% due 4/09/26 [Member] | Minimum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 3.66%  
United States Treasury Bills 3.66% – 3.68% due 4/09/26 [Member] | Maximum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 3.68%  
United States Treasury Bills 3.91% – 3.92% due 1/13/26 [Member]    
U.S. Treasury bills and notes, due date [1],[2]   Jan. 13, 2026
United States Treasury Bills 3.91% – 3.92% due 1/13/26 [Member] | Minimum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   3.91%
United States Treasury Bills 3.91% – 3.92% due 1/13/26 [Member] | Maximum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   3.92%
United States Treasury Bills 3.66% – 3.69% due 4/14/26 [Member]    
U.S. Treasury bills and notes, due date [1],[2] Apr. 14, 2026  
United States Treasury Bills 3.66% – 3.69% due 4/14/26 [Member] | Minimum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 3.66%  
United States Treasury Bills 3.66% – 3.69% due 4/14/26 [Member] | Maximum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 3.69%  
United States Treasury Bills 3.57% – 3.95% due 1/15/26 [Member]    
U.S. Treasury bills and notes, due date [1],[2]   Jan. 15, 2026
United States Treasury Bills 3.57% – 3.95% due 1/15/26 [Member] | Minimum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   3.57%
United States Treasury Bills 3.57% – 3.95% due 1/15/26 [Member] | Maximum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   3.95%
United States Treasury Bills 3.68% due 4/16/26 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 3.68%  
U.S. Treasury bills and notes, due date [1],[2] Apr. 16, 2026  
United States Treasury Bills 3.89% – 3.94% due 1/20/26 [Member]    
U.S. Treasury bills and notes, due date [1],[2]   Jan. 20, 2026
United States Treasury Bills 3.89% – 3.94% due 1/20/26 [Member] | Minimum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   3.89%
United States Treasury Bills 3.89% – 3.94% due 1/20/26 [Member] | Maximum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   3.94%
United States Treasury Bills 3.68% – 3.69% due 4/21/26 [Member]    
U.S. Treasury bills and notes, due date [1],[2] Apr. 21, 2026  
United States Treasury Bills 3.68% – 3.69% due 4/21/26 [Member] | Minimum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 3.68%  
United States Treasury Bills 3.68% – 3.69% due 4/21/26 [Member] | Maximum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 3.69%  
United States Treasury Bills 3.58% – 3.86% due 1/22/26 [Member]    
U.S. Treasury bills and notes, due date [1],[2]   Jan. 22, 2026
United States Treasury Bills 3.58% – 3.86% due 1/22/26 [Member] | Minimum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   3.58%
United States Treasury Bills 3.58% – 3.86% due 1/22/26 [Member] | Maximum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   3.86%
United States Treasury Bills 3.68% – 3.69% due 4/23/26 [Member]    
U.S. Treasury bills and notes, due date [1],[2] Apr. 23, 2026  
United States Treasury Bills 3.68% – 3.69% due 4/23/26 [Member] | Minimum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 3.68%  
United States Treasury Bills 3.68% – 3.69% due 4/23/26 [Member] | Maximum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 3.69%  
United States Treasury Bills 3.86% – 3.89% due 1/27/26 [Member]    
U.S. Treasury bills and notes, due date [1],[2]   Jan. 27, 2026
United States Treasury Bills 3.86% – 3.89% due 1/27/26 [Member] | Minimum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   3.86%
United States Treasury Bills 3.86% – 3.89% due 1/27/26 [Member] | Maximum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   3.89%
United States Treasury Bills 3.70% due 4/28/26 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 3.70%  
U.S. Treasury bills and notes, due date [1],[2] Apr. 28, 2026  
United States Treasury Bills 3.61% – 3.86% due 1/29/26 [Member]    
U.S. Treasury bills and notes, due date [1],[2]   Jan. 29, 2026
United States Treasury Bills 3.61% – 3.86% due 1/29/26 [Member] | Minimum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   3.61%
United States Treasury Bills 3.61% – 3.86% due 1/29/26 [Member] | Maximum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   3.86%
United States Treasury Bills 3.66% due 5/07/26 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 3.66%  
U.S. Treasury bills and notes, due date [1],[2] May 07, 2026  
United States Treasury Bills 3.87% due 2/05/26 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   3.87%
U.S. Treasury bills and notes, due date [1],[2]   Feb. 05, 2026
United States Treasury Bills 3.67% – 3.68% due 5/14/26 [Member]    
U.S. Treasury bills and notes, due date [1],[2] May 14, 2026  
United States Treasury Bills 3.67% – 3.68% due 5/14/26 [Member] | Minimum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 3.67%  
United States Treasury Bills 3.67% – 3.68% due 5/14/26 [Member] | Maximum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 3.68%  
United States Treasury Bills 3.64% – 3.67% due 2/10/26 [Member]    
U.S. Treasury bills and notes, due date [1],[2]   Feb. 10, 2026
United States Treasury Bills 3.64% – 3.67% due 2/10/26 [Member] | Minimum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   3.64%
United States Treasury Bills 3.64% – 3.67% due 2/10/26 [Member] | Maximum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   3.67%
United States Treasury Bills 3.66% – 3.68% due 5/21/26 [Member]    
U.S. Treasury bills and notes, due date [1],[2] May 21, 2026  
United States Treasury Bills 3.66% – 3.68% due 5/21/26 [Member] | Minimum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 3.66%  
United States Treasury Bills 3.66% – 3.68% due 5/21/26 [Member] | Maximum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 3.68%  
United States Treasury Bills 3.63% – 3.89% due 2/12/26 [Member]    
U.S. Treasury bills and notes, due date [1],[2]   Feb. 12, 2026
United States Treasury Bills 3.63% – 3.89% due 2/12/26 [Member] | Minimum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   3.63%
United States Treasury Bills 3.63% – 3.89% due 2/12/26 [Member] | Maximum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   3.89%
United States Treasury Bills 3.70% due 5/26/26 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 3.70%  
U.S. Treasury bills and notes, due date [1],[2] May 26, 2026  
United States Treasury Bills 3.79% due 2/17/26 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   3.79%
U.S. Treasury bills and notes, due date [1],[2]   Feb. 17, 2026
United States Treasury Bills 3.68% due 5/28/26 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 3.68%  
U.S. Treasury bills and notes, due date [1],[2] May 28, 2026  
United States Treasury Bills 3.82% due 2/19/26 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   3.82%
U.S. Treasury bills and notes, due date [1],[2]   Feb. 19, 2026
United States Treasury Bills 3.67% due 6/02/26 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 3.67%  
U.S. Treasury bills and notes, due date [1],[2] Jun. 02, 2026  
United States Treasury Bills 3.81% due 2/24/26 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   3.81%
U.S. Treasury bills and notes, due date [1],[2]   Feb. 24, 2026
United States Treasury Bills 3.67% due 6/04/26 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 3.67%  
U.S. Treasury bills and notes, due date [1],[2] Jun. 04, 2026  
United States Treasury Bills 3.75% – 3.81% due 2/26/26 [Member]    
U.S. Treasury bills and notes, due date [1],[2]   Feb. 26, 2026
United States Treasury Bills 3.75% – 3.81% due 2/26/26 [Member] | Minimum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   3.75%
United States Treasury Bills 3.75% – 3.81% due 2/26/26 [Member] | Maximum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   3.81%
United States Treasury Bills 3.69% due 6/11/26 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 3.69%  
U.S. Treasury bills and notes, due date [1],[2] Jun. 11, 2026  
United States Treasury Bills 3.69% – 3.71% due 3/05/26 [Member]    
U.S. Treasury bills and notes, due date [1],[2]   Mar. 05, 2026
United States Treasury Bills 3.69% – 3.71% due 3/05/26 [Member] | Minimum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   3.69%
United States Treasury Bills 3.69% – 3.71% due 3/05/26 [Member] | Maximum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   3.71%
United States Treasury Bills 3.70% due 6/18/26 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 3.70%  
U.S. Treasury bills and notes, due date [1],[2] Jun. 18, 2026  
United States Treasury Bills 3.69% – 3.82% due 3/10/26 [Member]    
U.S. Treasury bills and notes, due date [1],[2]   Mar. 10, 2026
United States Treasury Bills 3.69% – 3.82% due 3/10/26 [Member] | Minimum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   3.69%
United States Treasury Bills 3.69% – 3.82% due 3/10/26 [Member] | Maximum [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   3.82%
United States Treasury Bills 3.66% due 6/23/26 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 3.66%  
U.S. Treasury bills and notes, due date [1],[2] Jun. 23, 2026  
United States Treasury Bills 3.66% due 3/12/26 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   3.66%
U.S. Treasury bills and notes, due date [1],[2]   Mar. 12, 2026
United States Treasury Bills 3.67% due 6/30/26 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 3.67%  
U.S. Treasury bills and notes, due date [1],[2] Jun. 30, 2026  
United States Treasury Bills 3.74% due 3/17/26 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   3.74%
U.S. Treasury bills and notes, due date [1],[2]   Mar. 17, 2026
United States Treasury Bills 3.69% due 7/07/26 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2] 3.69%  
U.S. Treasury bills and notes, due date [1],[2] Jul. 07, 2026  
United States Treasury Bills 3.61% due 3/19/26 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   3.61%
U.S. Treasury bills and notes, due date [1],[2]   Mar. 19, 2026
US Treasury Bill Securities [Member]    
Cost of short-term investments [1],[2] $ 1,038,462,634 $ 1,092,971,218
Percentage of net asset value 104.11% 101.07%
United States Treasury Bills 3.70% due 3/24/26 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   3.70%
U.S. Treasury bills and notes, due date [1],[2]   Mar. 24, 2026
United States Treasury Bills 3.60% due 4/07/26 [Member]    
U.S. Treasury bills and notes, effective rate [1],[2]   3.60%
U.S. Treasury bills and notes, due date [1],[2]   Apr. 07, 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.