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Schedules of Investments (Unaudited) - Investments (Details) - USD ($)
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Total U.S. Treasury bills and notes [1],[2] $ 963,739,089   $ 963,610,158      
Other Assets, Less Liabilities (4,334,824)   3,939,372      
Net Assets – 100.00% 959,404,265 $ 1,053,139,808 967,549,530 $ 1,098,519,705 $ 1,034,489,890 $ 968,051,679
United States Treasury Bills 4.07% - 4.31% due 7/01/25 [Member]            
U.S. Treasury bills and notes, face amount [1],[2] 108,000,000          
U.S. Treasury bills and notes, fair value [1],[2] 108,000,000          
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 4.29% - 4.30% due 7/03/25 [Member]            
U.S. Treasury bills and notes, face amount [1],[2] 72,000,000          
U.S. Treasury bills and notes, fair value [1],[2] 71,983,237          
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 4.20% - 4.32% due 7/08/25 [Member]            
U.S. Treasury bills and notes, face amount [1],[2] 186,000,000          
U.S. Treasury bills and notes, fair value [1],[2] 185,850,089          
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 4.21% - 4.30% due 7/10/25 [Member]            
U.S. Treasury bills and notes, face amount [1],[2] 105,500,000          
U.S. Treasury bills and notes, fair value [1],[2] 105,389,444          
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 4.19% - 4.29% due 7/15/25 [Member]            
U.S. Treasury bills and notes, face amount [1],[2] 135,000,000          
U.S. Treasury bills and notes, fair value [1],[2] 134,781,994          
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 4.28% - 4.31% due 7/17/25 [Member]            
U.S. Treasury bills and notes, face amount [1],[2] 69,500,000          
U.S. Treasury bills and notes, fair value [1],[2] 69,372,120          
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 4.32% due 7/22/25 [Member]            
U.S. Treasury bills and notes, face amount [1],[2] 48,000,000          
U.S. Treasury bills and notes, fair value [1],[2] 47,883,464          
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 4.31% due 7/24/25 [Member]            
U.S. Treasury bills and notes, face amount [1],[2] 45,000,000          
U.S. Treasury bills and notes, fair value [1],[2] 44,880,256          
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 4.50% 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 4.19% - 4.31% due 7/29/25 [Member]            
U.S. Treasury bills and notes, face amount [1],[2] 83,500,000          
U.S. Treasury bills and notes, fair value [1],[2] 83,230,481          
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 4.29% due 7/31/25 [Member]            
U.S. Treasury bills and notes, face amount [1],[2] 25,000,000          
U.S. Treasury bills and notes, fair value [1],[2] 24,913,188          
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 4.33% due 10/07/25 [Member]            
U.S. Treasury bills and notes, face amount [1],[2] 30,000,000          
U.S. Treasury bills and notes, fair value [1],[2] 29,656,745          
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 4.27% due 10/09/25 [Member]            
U.S. Treasury bills and notes, face amount [1],[2] 25,000,000          
U.S. Treasury bills and notes, fair value [1],[2] 24,709,531          
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 4.32% due 10/14/25 [Member]            
U.S. Treasury bills and notes, face amount [1],[2] 28,000,000          
U.S. Treasury bills and notes, fair value [1],[2] 27,657,068          
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 4.30% 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] 5,431,472          
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 4.45% – 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      
US Treasury Bill Securities [Member]            
Total U.S. Treasury bills and notes $ 963,739,089   963,610,158      
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 4.35% 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 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      
[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.