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Investments in Affiliates - Summary of Transactions in, and Earnings from, Investments in Affiliates (Excluding Affiliated Money Market Funds) (Detail) - USD ($) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Investments In And Advances To Affiliates [Line Items] |  |  |  |
Beginning Value |  |  | $ 1,269,897,511 |
Change in Unrealized Appreciation (Depreciation) | $ (111,502) | $ 128,688 | (418,539) | $ (554,636)
Ending Value | 1,002,334,244 |  | 1,002,334,244 |
Dividend Income | 8,497,747 | 13,546,440 | 18,108,485 | 25,434,009
Investment, Affiliated Issuer [Member] |  |  |  |
Investments In And Advances To Affiliates [Line Items] |  |  |  |
Beginning Value |  |  | 876,644,367 |
Ending Value | 1,002,334,244 |  | 1,002,334,244 |
Affiliated Investments [Member] |  |  |  |
Investments In And Advances To Affiliates [Line Items] |  |  |  |
Beginning Value |  |  | 876,644,367 |
Ending Value | 1,002,334,244 |  | 1,002,334,244 |
Affiliated Investments [Member] | Investment, Affiliated Issuer [Member] |  |  |  |
Investments In And Advances To Affiliates [Line Items] |  |  |  |
Beginning Value | 799,613,441 | 1,008,453,788 | 876,644,367 | 908,120,125
Purchases at Cost | 399,788,197 | 736,035,413 | 604,887,271 | 1,161,205,568
Proceeds from Sales | (197,077,591) | (697,831,485) | (479,075,024) | (1,022,392,644)
Change in Unrealized Appreciation (Depreciation) | 10,197 | 0 | (122,370) | (275,333)
Ending Value | 1,002,334,244 | 1,046,657,716 | 1,002,334,244 | 1,046,657,716
Dividend Income | 8,497,747 | 13,546,440 | 18,108,485 | 25,434,009
Affiliated Investments [Member] | Invesco Government & Agency Portfolio, Institutional Class [Member] | Investment, Affiliated Issuer [Member] |  |  |  |
Investments In And Advances To Affiliates [Line Items] |  |  |  |
Beginning Value | 584,374,808 | 793,347,723 | 661,273,167 | 692,738,727
Purchases at Cost | 399,788,197 | 736,035,413 | 604,887,271 | 1,161,205,568
Proceeds from Sales | (197,077,591) | (697,831,485) | (479,075,024) | (1,022,392,644)
Ending Value | 787,085,414 | 831,551,651 | 787,085,414 | 831,551,651
Dividend Income | 6,345,911 | 10,868,169 | 13,645,080 | 19,989,299
Affiliated Investments [Member] | Invesco Short Term Treasury ETF [Member] | Investment, Affiliated Issuer [Member] |  |  |  |
Investments In And Advances To Affiliates [Line Items] |  |  |  |
Beginning Value | 215,238,633 | 215,106,065 | 215,371,200 | 215,381,398
Change in Unrealized Appreciation (Depreciation) | 10,197 | 0 | (122,370) | (275,333)
Ending Value | 215,248,830 | 215,106,065 | 215,248,830 | 215,106,065
Dividend Income | $ 2,151,836 | $ 2,678,271 | $ 4,463,405 | $ 5,444,710

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