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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