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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
Mar. 31, 2023
Mar. 31, 2022
Investments In And Advances To Affiliates [Line Items]    
Beginning Value $ 1,425,350,540  
Change in Unrealized Appreciation (Depreciation) 228,974 $ (172,385)
Ending Value 1,144,277,704  
Affiliated Investments [Member]    
Investments In And Advances To Affiliates [Line Items]    
Beginning Value 1,425,350,540 2,004,216,762
Purchases at Cost 1,180,865,932 2,696,272,106
Proceeds from Sales (1,462,193,539) (1,397,939,891)
Change in Unrealized Appreciation (Depreciation) 254,771 (136,942)
Ending Value 1,144,277,704 3,302,412,035
Dividend Income 14,369,104 472,527
Affiliated Investments [Member] | Invesco Government & Agency Portfolio, Institutional Class [Member]    
Investments In And Advances To Affiliates [Line Items]    
Beginning Value 1,284,100,134 1,811,356,075
Purchases at Cost 1,180,865,932 2,696,272,106
Proceeds from Sales (1,462,193,539) (1,397,939,891)
Ending Value 1,002,772,527 3,109,688,290
Dividend Income 13,010,611 460,914
Affiliated Investments [Member] | Invesco Treasury Collateral ETF [Member]    
Investments In And Advances To Affiliates [Line Items]    
Beginning Value 141,250,406 [1] 192,860,687
Change in Unrealized Appreciation (Depreciation) 254,771 (136,942)
Ending Value 141,505,177 [2] 192,723,745
Dividend Income $ 1,358,493 $ 11,613
[1] Affiliated issuer. The issuer and/or the Fund is a wholly-owned subsidiary of Invesco Ltd., or is affiliated by having an investment adviser that is under common control of Invesco Ltd. See Note 8.
[2] Affiliated issuer. The issuer and/or the Fund is a wholly-owned subsidiary of Invesco Ltd., or is affiliated by having an investment adviser that is under common control of Invesco Ltd. See Note 8.