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Schedules of Investments (Unaudited) - Investments (Details) - USD ($)
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Dec. 31, 2024
Total U.S. Treasury bills and notes [1],[2] $ 1,038,441,951 $ 1,093,235,756    
Other Assets, Less Liabilities (41,027,462) (11,561,055)    
Net Assets – 100.00% 997,414,489 1,081,674,701 $ 1,053,139,808 $ 967,549,530
United States Treasury Bills 3.66% – 3.68% due 4/02/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2] 76,070,000      
U.S. Treasury bills and notes, fair value [1],[2] 76,062,332      
United States Treasury Bills 3.92% – 3.94% due 1/02/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2]   66,900,000    
U.S. Treasury bills and notes, fair value [1],[2]   66,900,000    
United States Treasury Bills 3.60% – 3.69% due 4/07/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2] 103,200,000      
U.S. Treasury bills and notes, fair value [1],[2] 103,137,823      
United States Treasury Bills 3.92% due 1/06/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2]   34,200,000    
U.S. Treasury bills and notes, fair value [1],[2]   34,186,871    
United States Treasury Bills 3.88% – 3.94% due 1/08/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2]   68,500,000    
U.S. Treasury bills and notes, fair value [1],[2]   68,460,347    
United States Treasury Bills 3.66% – 3.68% due 4/09/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2] 61,200,000      
U.S. Treasury bills and notes, fair value [1],[2] 61,150,897      
United States Treasury Bills 3.91% – 3.92% due 1/13/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2]   67,750,000    
U.S. Treasury bills and notes, fair value [1],[2]   67,677,470    
United States Treasury Bills 3.66% – 3.69% due 4/14/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2] 40,000,000      
U.S. Treasury bills and notes, fair value [1],[2] 39,947,566      
United States Treasury Bills 3.57% – 3.95% due 1/15/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2]   11,150,000    
U.S. Treasury bills and notes, fair value [1],[2]   11,135,749    
United States Treasury Bills 3.68% due 4/16/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2] 43,600,000      
U.S. Treasury bills and notes, fair value [1],[2] 43,534,128      
United States Treasury Bills 3.89% – 3.94% due 1/20/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2]   56,200,000    
U.S. Treasury bills and notes, fair value [1],[2]   56,100,686    
United States Treasury Bills 3.68% – 3.69% due 4/21/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2] 68,070,000      
U.S. Treasury bills and notes, fair value [1],[2] 67,932,801      
United States Treasury Bills 3.58% – 3.86% due 1/22/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2]   49,200,000    
U.S. Treasury bills and notes, fair value [1],[2]   49,102,876    
United States Treasury Bills 3.68% – 3.69% due 4/23/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2] 72,600,000      
U.S. Treasury bills and notes, fair value [1],[2] 72,438,964      
United States Treasury Bills 3.86% – 3.89% due 1/27/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2]   42,800,000    
U.S. Treasury bills and notes, fair value [1],[2]   42,695,099    
United States Treasury Bills 3.70% due 4/28/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2] 30,000,000      
U.S. Treasury bills and notes, fair value [1],[2] 29,918,314      
United States Treasury Bills 3.61% – 3.86% due 1/29/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2]   55,500,000    
U.S. Treasury bills and notes, fair value [1],[2]   55,353,436    
United States Treasury Bills 3.66% due 5/07/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2] 15,000,000      
U.S. Treasury bills and notes, fair value [1],[2] 14,945,363      
United States Treasury Bills 3.87% due 2/05/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2]   40,000,000    
U.S. Treasury bills and notes, fair value [1],[2]   39,866,217    
United States Treasury Bills 3.67% – 3.68% due 5/14/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2] 88,484,000      
U.S. Treasury bills and notes, fair value [1],[2] 88,099,242      
United States Treasury Bills 3.64% – 3.67% due 2/10/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2]   48,000,000    
U.S. Treasury bills and notes, fair value [1],[2]   47,815,993    
United States Treasury Bills 3.66% – 3.68% due 5/21/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2] 99,447,000      
U.S. Treasury bills and notes, fair value [1],[2] 98,945,897      
United States Treasury Bills 3.63% – 3.89% due 2/12/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2]   70,500,000    
U.S. Treasury bills and notes, fair value [1],[2]   70,211,804    
United States Treasury Bills 3.70% due 5/26/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2] 42,000,000      
U.S. Treasury bills and notes, fair value [1],[2] 41,766,116      
United States Treasury Bills 3.79% due 2/17/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2]   36,400,000    
U.S. Treasury bills and notes, fair value [1],[2]   36,235,646    
United States Treasury Bills 3.68% due 5/28/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2] 30,000,000      
U.S. Treasury bills and notes, fair value [1],[2] 29,827,228      
United States Treasury Bills 3.82% due 2/19/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2]   45,000,000    
U.S. Treasury bills and notes, fair value [1],[2]   44,786,195    
United States Treasury Bills 3.67% due 6/02/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2] 35,000,000      
U.S. Treasury bills and notes, fair value [1],[2] 34,782,297      
United States Treasury Bills 3.81% due 2/24/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2]   50,000,000    
U.S. Treasury bills and notes, fair value [1],[2]   49,739,917    
United States Treasury Bills 3.67% due 6/04/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2] 47,000,000      
U.S. Treasury bills and notes, fair value [1],[2] 46,698,048      
United States Treasury Bills 3.75% – 3.81% due 2/26/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2]   46,100,000    
U.S. Treasury bills and notes, fair value [1],[2]   45,847,244    
United States Treasury Bills 3.69% due 6/11/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2] 60,500,000      
U.S. Treasury bills and notes, fair value [1],[2] 60,070,772      
United States Treasury Bills 3.69% – 3.71% due 3/05/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2]   48,600,000    
U.S. Treasury bills and notes, fair value [1],[2]   48,304,152    
United States Treasury Bills 3.70% due 6/18/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2] 40,000,000      
U.S. Treasury bills and notes, fair value [1],[2] 39,688,260      
United States Treasury Bills 3.69% – 3.82% due 3/10/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2]   72,800,000    
U.S. Treasury bills and notes, fair value [1],[2]   72,328,753    
United States Treasury Bills 3.66% due 6/23/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2] 35,000,000      
U.S. Treasury bills and notes, fair value [1],[2] 34,711,478      
United States Treasury Bills 3.66% due 3/12/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2]   74,000,000    
U.S. Treasury bills and notes, fair value [1],[2]   73,497,006    
United States Treasury Bills 3.67% due 6/30/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2] 30,300,000      
U.S. Treasury bills and notes, fair value [1],[2] 30,027,565      
United States Treasury Bills 3.74% due 3/17/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2]   35,000,000    
U.S. Treasury bills and notes, fair value [1],[2]   34,748,257    
United States Treasury Bills 3.69% due 7/07/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2] 25,000,000      
U.S. Treasury bills and notes, fair value [1],[2] 24,756,860      
United States Treasury Bills 3.61% due 3/19/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2]   30,000,000    
U.S. Treasury bills and notes, fair value [1],[2]   29,776,646    
United States Treasury Bills 3.70% due 3/24/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2]   14,700,000    
U.S. Treasury bills and notes, fair value [1],[2]   14,583,440    
US Treasury Bill Securities [Member]        
Total U.S. Treasury bills and notes $ 1,038,441,951 1,093,235,756    
United States Treasury Bills 3.60% due 4/07/26 [Member]        
U.S. Treasury bills and notes, face amount [1],[2]   34,200,000    
U.S. Treasury bills and notes, fair value [1],[2]   $ 33,881,952    
[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.