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Investments in Affiliates - Summary of Transactions in, and Earnings from, Investments in Affiliates (Detail) - USD ($)
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Investments In And Advances To Affiliates [Line Items]    
Beginning Value $ 827,643,639  
Change in Unrealized Appreciation (Depreciation) (153,184) $ 39,941
Ending Value 1,587,418,783  
Affiliated Investments [Member]    
Investments In And Advances To Affiliates [Line Items]    
Beginning Value 827,643,639 425,809,714
Purchases at Cost 1,190,169,072 394,242,761
Proceeds from Sales (430,330,575) (371,558,777)
Change in Unrealized Appreciation (Depreciation) (63,353) 12,671
Ending Value 1,587,418,783 448,506,369
Dividend Income 198,867 43,692
Exchange-Traded Fund [Member] | Affiliated Investments [Member]    
Investments In And Advances To Affiliates [Line Items]    
Beginning Value 89,221,438 [1] 89,259,449
Change in Unrealized Appreciation (Depreciation) (63,353) 12,671
Ending Value 89,158,085 [1] 89,272,120
Dividend Income 5,372 13,279
Money Market Mutual Fund - Invesco Government & Agency Portfolio - Institutional Class [Member] | Invesco Government And Agency Portfolio - Institutional Class [Member] | Affiliated Investments [Member]    
Investments In And Advances To Affiliates [Line Items]    
Beginning Value [1],[2] 738,422,201  
Ending Value [1],[3] 1,498,260,698  
Institutional Class [Member] | Invesco Government And Agency Portfolio - Institutional Class [Member] | Affiliated Investments [Member]    
Investments In And Advances To Affiliates [Line Items]    
Beginning Value 738,422,201 336,550,265
Purchases at Cost 1,190,169,072 394,242,761
Proceeds from Sales (430,330,575) (371,558,777)
Ending Value 1,498,260,698 359,234,249
Dividend Income $ 193,495 $ 30,413
[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] The rate shown is the 7-day SEC standardized yield as of December 31, 2021.
[3] The rate shown is the 7-day SEC standardized yield as of March 31, 2022.