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Schedules of Investments (Unaudited) - Investments (Details) - USD ($)
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Total U.S. Treasury bills and notes [1],[2] $ 999,246,373     $ 963,610,158        
Other Assets, Less Liabilities (5,176,151)     3,939,372        
Net Assets – 100.00% 994,070,222 $ 959,404,265 $ 1,053,139,808 967,549,530 $ 881,380,256 $ 1,098,519,705 $ 1,034,489,890 $ 968,051,679
United States Treasury Bills 4.30% due 10/02/25 [Member]                
U.S. Treasury bills and notes, face amount [1],[2] 42,800,000              
U.S. Treasury bills and notes, fair value [1],[2] 42,795,219              
United States Treasury Bills 4.17% – 4.59% due 1/02/25 [Member]                
U.S. Treasury bills and notes, face amount [1],[2]       37,500,000        
U.S. Treasury bills and notes, fair value [1],[2]       37,500,000        
United States Treasury Bills 4.34% – 4.62% due 1/07/25 [Member]                
U.S. Treasury bills and notes, face amount [1],[2]       98,000,000        
U.S. Treasury bills and notes, fair value [1],[2]       97,944,299        
United States Treasury Bills 4.31% – 4.33% due 10/07/25 [Member]                
U.S. Treasury bills and notes, face amount [1],[2] 86,500,000              
U.S. Treasury bills and notes, fair value [1],[2] 86,441,364              
United States Treasury Bills 4.57% due 1/09/25 [Member]                
U.S. Treasury bills and notes, face amount [1],[2]       43,000,000        
U.S. Treasury bills and notes, fair value [1],[2]       42,964,807        
United States Treasury Bills 4.29% – 4.51% due 1/14/25 [Member]                
U.S. Treasury bills and notes, face amount [1],[2]       89,000,000        
U.S. Treasury bills and notes, fair value [1],[2]       88,875,569        
United States Treasury Bills 4.27% – 4.34% due 10/09/25 [Member]                
U.S. Treasury bills and notes, face amount [1],[2] 34,000,000              
U.S. Treasury bills and notes, fair value [1],[2] 33,969,313              
United States Treasury Bills 4.53% due 1/16/25 [Member]                
U.S. Treasury bills and notes, face amount [1],[2]       56,000,000        
U.S. Treasury bills and notes, fair value [1],[2]       55,907,757        
United States Treasury Bills 4.07% – 4.32% due 10/14/25 [Member]                
U.S. Treasury bills and notes, face amount [1],[2] 43,000,000              
U.S. Treasury bills and notes, fair value [1],[2] 42,937,275              
United States Treasury Bills 4.61% due 1/21/25 [Member]                
U.S. Treasury bills and notes, face amount [1],[2]       30,000,000        
U.S. Treasury bills and notes, fair value [1],[2]       29,932,776        
United States Treasury Bills 4.30% due 10/16/25 [Member]                
U.S. Treasury bills and notes, face amount [1],[2] 5,500,000              
U.S. Treasury bills and notes, fair value [1],[2] 5,490,710              
United States Treasury Bills 4.62% due 1/23/25 [Member]                
U.S. Treasury bills and notes, face amount [1],[2]       30,000,000        
U.S. Treasury bills and notes, fair value [1],[2]       29,925,716        
United States Treasury Bills 4.14% – 4.29% due 10/21/25 [Member]                
U.S. Treasury bills and notes, face amount [1],[2] 43,300,000              
U.S. Treasury bills and notes, fair value [1],[2] 43,202,719              
United States Treasury Bills 4.48% due 1/28/25 [Member]                
U.S. Treasury bills and notes, face amount [1],[2]       36,000,000        
U.S. Treasury bills and notes, fair value [1],[2]       35,890,863        
United States Treasury Bills 4.22% due 10/28/25 [Member]                
U.S. Treasury bills and notes, face amount [1],[2] 140,500,000              
U.S. Treasury bills and notes, fair value [1],[2] 140,073,800              
United States Treasury Bills 4.51% due 1/30/25 [Member]                
U.S. Treasury bills and notes, face amount [1],[2]       50,000,000        
U.S. Treasury bills and notes, fair value [1],[2]       49,835,497        
United States Treasury Bills 4.21% due 10/30/25 [Member]                
U.S. Treasury bills and notes, face amount [1],[2] 50,000,000              
U.S. Treasury bills and notes, fair value [1],[2] 49,836,706              
United States Treasury Bills 4.50% due 2/04/25 [Member]                
U.S. Treasury bills and notes, face amount [1],[2]       55,000,000        
U.S. Treasury bills and notes, fair value [1],[2]       54,788,541        
United States Treasury Bills 4.14% due 11/04/25 [Member]                
U.S. Treasury bills and notes, face amount [1],[2] 2,500,000              
U.S. Treasury bills and notes, fair value [1],[2] 2,490,522              
United States Treasury Bills 4.35% – 4.47% due 2/06/25 [Member]                
U.S. Treasury bills and notes, face amount [1],[2]       42,500,000        
U.S. Treasury bills and notes, fair value [1],[2]       42,325,521        
United States Treasury Bills 4.18% – 4.24% due 11/06/25 [Member]                
U.S. Treasury bills and notes, face amount [1],[2] 95,400,000              
U.S. Treasury bills and notes, fair value [1],[2] 95,016,255              
United States Treasury Bills 4.34% due 2/11/25 [Member]                
U.S. Treasury bills and notes, face amount [1],[2]       75,000,000        
U.S. Treasury bills and notes, fair value [1],[2]       74,651,357        
United States Treasury Bills 4.08% due 11/12/25 [Member]                
U.S. Treasury bills and notes, face amount [1],[2] 63,000,000              
U.S. Treasury bills and notes, fair value [1],[2] 62,705,905              
United States Treasury Bills 4.50% due 2/13/25 [Member]                
U.S. Treasury bills and notes, face amount [1],[2]       82,000,000        
U.S. Treasury bills and notes, fair value [1],[2]       81,594,453        
United States Treasury Bills 4.30% due 2/18/25 [Member]                
U.S. Treasury bills and notes, face amount [1],[2]       5,000,000        
U.S. Treasury bills and notes, fair value [1],[2]       4,972,655        
United States Treasury Bills 4.22% – 4.23% due 11/13/25 [Member]                
U.S. Treasury bills and notes, face amount [1],[2] 87,100,000              
U.S. Treasury bills and notes, fair value [1],[2] 86,682,045              
United States Treasury Bills 4.53% due 2/20/25 [Member]                
U.S. Treasury bills and notes, face amount [1],[2]       64,000,000        
U.S. Treasury bills and notes, fair value [1],[2]       63,636,179        
United States Treasury Bills 4.05% due 11/18/25 [Member]                
U.S. Treasury bills and notes, face amount [1],[2] 34,300,000              
U.S. Treasury bills and notes, fair value [1],[2] 34,117,524              
United States Treasury Bills 4.29% due 2/25/25 [Member]                
U.S. Treasury bills and notes, face amount [1],[2]       9,500,000        
U.S. Treasury bills and notes, fair value [1],[2]       9,440,139        
United States Treasury Bills 4.23% due 11/20/25 [Member]                
U.S. Treasury bills and notes, face amount [1],[2] 40,000,000              
U.S. Treasury bills and notes, fair value [1],[2] 39,779,444              
United States Treasury Bills 4.45% – 4.50% due 2/27/25 [Member]                
U.S. Treasury bills and notes, face amount [1],[2]       25,000,000        
U.S. Treasury bills and notes, fair value [1],[2]       24,835,859        
United States Treasury Bills 4.03% – 4.18% due 11/28/25 [Member]                
U.S. Treasury bills and notes, face amount [1],[2] 47,400,000              
U.S. Treasury bills and notes, fair value [1],[2] 47,094,571              
United States Treasury Bills 4.46% due 3/06/25 [Member]                
U.S. Treasury bills and notes, face amount [1],[2]       28,750,000        
U.S. Treasury bills and notes, fair value [1],[2]       28,539,454        
United States Treasury Bills 4.11% due 12/04/25 [Member]                
U.S. Treasury bills and notes, face amount [1],[2] 48,000,000              
U.S. Treasury bills and notes, fair value [1],[2] 47,667,381              
United States Treasury Bills 4.35% due 3/13/25 [Member]                
U.S. Treasury bills and notes, face amount [1],[2]       50,000,000        
U.S. Treasury bills and notes, fair value [1],[2]       49,593,634        
United States Treasury Bills 3.92% – 4.04% due 12/11/25 [Member]                
U.S. Treasury bills and notes, face amount [1],[2] 65,000,000              
U.S. Treasury bills and notes, fair value [1],[2] 64,506,451              
United States Treasury Bills 4.34% due 3/20/25 [Member]                
U.S. Treasury bills and notes, face amount [1],[2]       61,000,000        
U.S. Treasury bills and notes, fair value [1],[2]       60,455,082        
United States Treasury Bills 3.98% due 12/18/25 [Member]                
U.S. Treasury bills and notes, face amount [1],[2] 22,500,000              
U.S. Treasury bills and notes, fair value [1],[2] 22,311,493              
US Treasury Bill Securities [Member]                
Total U.S. Treasury bills and notes 999,246,373     $ 963,610,158        
United States Treasury Bills 3.92% due 1/06/26 [Member]                
U.S. Treasury bills and notes, face amount [1],[2] 25,000,000              
U.S. Treasury bills and notes, fair value [1],[2] 24,741,839              
United States Treasury Bills 3.92% due 1/13/26 [Member]                
U.S. Treasury bills and notes, face amount [1],[2] 16,500,000              
U.S. Treasury bills and notes, fair value [1],[2] 16,317,754              
United States Treasury Bills 3.94% due 1/20/26 [Member]                
U.S. Treasury bills and notes, face amount [1],[2] 11,200,000              
U.S. Treasury bills and notes, fair value [1],[2] $ 11,068,083              
[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.