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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

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