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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 | 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 |  |  | $ 1,692,470,773 |
Change in Unrealized Appreciation (Depreciation) | $ 487,288 | $ (386,778) | (67,348) | $ (248,036)
Ending Value | 1,412,195,428 |  | 1,412,195,428 |
Dividend Income | 11,324,043 | 17,257,593 | 36,758,052 | 45,303,312
Investment, Affiliated Issuer [Member] |  |  |  |
Investments In And Advances To Affiliates [Line Items] |  |  |  |
Beginning Value |  |  | 908,120,125 |
Ending Value | 717,613,302 |  | 717,613,302 |
Affiliated Investments [Member] |  |  |  |
Investments In And Advances To Affiliates [Line Items] |  |  |  |
Purchases at Cost | 249,837,211 | 565,257,450 | 1,411,042,779 | 2,865,333,743
Proceeds from Sales | (579,269,130) | (335,185,223) | (1,601,661,774) | (2,879,370,126)
Change in Unrealized Appreciation (Depreciation) | 387,505 | 65,377 | 112,172 | 239,694
Affiliated Investments [Member] | Investment, Affiliated Issuer [Member] |  |  |  |
Investments In And Advances To Affiliates [Line Items] |  |  |  |
Beginning Value | 1,046,657,716 | 1,181,416,247 | 908,120,125 | 1,425,350,540
Ending Value | 717,613,302 | 1,411,553,851 | 717,613,302 | 1,411,553,851
Dividend Income | 11,324,043 | 17,257,593 | 36,758,052 | 45,303,312
Affiliated Investments [Member] | Invesco Government & Agency Portfolio, Institutional Class [Member] |  |  |  |
Investments In And Advances To Affiliates [Line Items] |  |  |  |
Purchases at Cost | 249,837,211 | 491,580,300 | 1,411,042,779 | 2,791,656,593
Proceeds from Sales | (579,269,130) | (335,185,223) | (1,601,661,774) | (2,879,370,126)
Affiliated Investments [Member] | Invesco Government & Agency Portfolio, Institutional Class [Member] | Investment, Affiliated Issuer [Member] |  |  |  |
Investments In And Advances To Affiliates [Line Items] |  |  |  |
Beginning Value | 831,551,651 | 1,039,991,524 | 692,738,727 | 1,284,100,134
Ending Value | 502,119,732 | 1,196,386,601 | 502,119,732 | 1,196,386,601
Dividend Income | 8,519,057 | 14,895,087 | 28,508,356 | 40,031,375
Affiliated Investments [Member] | Invesco Short Term Treasury ETF [Member] |  |  |  |
Investments In And Advances To Affiliates [Line Items] |  |  |  |
Purchases at Cost |  | 73,677,150 |  | 73,677,150
Change in Unrealized Appreciation (Depreciation) | 387,505 | 65,377 | 112,172 | 239,694
Affiliated Investments [Member] | Invesco Short Term Treasury ETF [Member] | Investment, Affiliated Issuer [Member] |  |  |  |
Investments In And Advances To Affiliates [Line Items] |  |  |  |
Beginning Value | 215,106,065 | 141,424,723 | 215,381,398 | 141,250,406
Ending Value | 215,493,570 | 215,167,250 | 215,493,570 | 215,167,250
Dividend Income | $ 2,804,986 | $ 2,362,506 | $ 8,249,696 | $ 5,271,937

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