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Investments in Affiliates - Summary of Transactions in, and Earnings from, Investments in Affiliates (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Investments in and Advances to Affiliates [Line Items] |  |  |
Beginning Value | $ 710,772,102 |  |
Change in Unrealized Appreciation (Depreciation) | (90,747) | $ 171,804 | $ 178,637
Ending Value | 767,686,990 | 710,772,102 |
Dividend Income | 21,577,336 | 24,359,948 | 12,480,118
Investment, Affiliated Issuer [Member] |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Beginning Value | 367,815,458 |  |
Ending Value | 521,903,775 | 367,815,458 |
Affiliated Investments [Member] |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Purchases at Cost | 1,088,771,837 | 1,461,510,451 | 3,155,758,046
Proceeds from Sales | (934,677,851) | (1,611,536,659) | (3,465,598,343)
Change in Unrealized Appreciation (Depreciation) | (5,669) | 279,064 | (240,740)
Realized Gain (Loss) |  |  | 0
Affiliated Investments [Member] | Investment, Affiliated Issuer [Member] |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Beginning Value | 367,815,458 | 517,562,602 | 827,643,639
Ending Value | 521,903,775 | 367,815,458 | 517,562,602
Dividend Income | 21,577,336 | 24,359,948 | 12,480,118
Affiliated Investments [Member] | Invesco Government & Agency Portfolio, Institutional Class [Member] |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Purchases at Cost | 1,088,771,837 | 1,431,035,264 | 3,155,758,046
Proceeds from Sales | (934,677,851) | (1,611,536,659) | (3,465,598,343)
Affiliated Investments [Member] | Invesco Government & Agency Portfolio, Institutional Class [Member] | Investment, Affiliated Issuer [Member] |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Beginning Value | 248,080,509 | 428,581,904 | 738,422,201
Ending Value | 402,174,495 | 248,080,509 | 428,581,904
Dividend Income | 15,604,807 | 19,001,072 | 11,257,863
Affiliated Investments [Member] | Invesco Treasury Collateral ETF [Member] |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Purchases at Cost |  | 30,475,187 |
Change in Unrealized Appreciation (Depreciation) | (5,669) | 279,064 | (240,740)
Affiliated Investments [Member] | Invesco Treasury Collateral ETF [Member] | Investment, Affiliated Issuer [Member] |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |
Beginning Value | 119,734,949 | 88,980,698 | 89,221,438
Ending Value | 119,729,280 | 119,734,949 | 88,980,698
Dividend Income | $ 5,972,529 | $ 5,358,876 | $ 1,222,255

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