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Investments in Affiliates - Summary of Transactions in, and Earnings from, Investments in Affiliates (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Investments in and Advances to Affiliates [Line Items]        
Beginning Value     $ 710,772,102  
Change in Unrealized Appreciation (Depreciation) $ 199,797 $ (178,241) (56,817) $ (96,119)
Ending Value 751,154,945   751,154,945  
Dividend Income 5,213,894 6,380,385 16,090,976 18,235,721
Investment, Affiliated Issuer [Member]        
Investments in and Advances to Affiliates [Line Items]        
Beginning Value     367,815,458  
Ending Value 453,468,420   453,468,420  
Affiliated Investments [Member]        
Investments in and Advances to Affiliates [Line Items]        
Purchases at Cost 227,671,661 158,979,371 744,541,217 1,305,351,780
Proceeds from Sales (181,780,880) (161,653,379) (658,950,614) (1,336,838,339)
Change in Unrealized Appreciation (Depreciation) 215,423 34,014 62,359 160,015
Affiliated Investments [Member] | Investment, Affiliated Issuer [Member]        
Investments in and Advances to Affiliates [Line Items]        
Beginning Value 407,362,216 488,876,052 367,815,458 517,562,602
Ending Value 453,468,420 486,236,058 453,468,420 486,236,058
Dividend Income 5,213,894 6,380,385 16,090,976 18,235,721
Affiliated Investments [Member] | Invesco Government & Agency Portfolio, Institutional Class [Member]        
Investments in and Advances to Affiliates [Line Items]        
Purchases at Cost 227,671,661 158,979,371 744,541,217 1,274,876,593
Proceeds from Sales (181,780,880) (161,653,379) (658,950,614) (1,336,838,339)
Affiliated Investments [Member] | Invesco Government & Agency Portfolio, Institutional Class [Member] | Investment, Affiliated Issuer [Member]        
Investments in and Advances to Affiliates [Line Items]        
Beginning Value 287,780,331 369,294,166 248,080,509 428,581,904
Ending Value 333,671,112 366,620,158 333,671,112 366,620,158
Dividend Income 3,654,545 4,898,554 11,504,801 14,479,210
Affiliated Investments [Member] | Invesco Short Term Treasury ETF [Member]        
Investments in and Advances to Affiliates [Line Items]        
Purchases at Cost       30,475,187
Change in Unrealized Appreciation (Depreciation) 215,423 34,014 62,359 160,015
Affiliated Investments [Member] | Invesco Short Term Treasury ETF [Member] | Investment, Affiliated Issuer [Member]        
Investments in and Advances to Affiliates [Line Items]        
Beginning Value 119,581,885 119,581,886 119,734,949 88,980,698
Ending Value 119,797,308 119,615,900 119,797,308 119,615,900
Dividend Income $ 1,559,349 $ 1,481,831 $ 4,586,175 $ 3,756,511