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Investments in Affiliates -Summary of Transactions in, and Earnings from, Investments in Affiliates (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Investments In And Advances To Affiliates [Line Items]        
Beginning Value     $ 626,458,758  
United States Treasury Obligations $ (1,320,328) $ (18,230) (1,372,163) $ (3,554)
Ending Value 1,088,529,034   1,088,529,034  
Affiliated Investments [Member]        
Investments In And Advances To Affiliates [Line Items]        
Beginning Value 780,011,295 232,267,665 626,458,758 245,409,996
Purchases at Cost 917,758,776 135,306,617 1,326,583,519 448,948,844
Proceeds from Sales (609,264,637) (84,096,480) (864,501,443) (410,888,118)
United States Treasury Obligations 23,600 (7,080) (11,800)  
Ending Value 1,088,529,034 283,470,722 1,088,529,034 283,470,722
Dividend Income 1,740,933 13,773 1,852,946 35,325
Affiliated Investments [Member] | Exchange-Traded Fund [Member]        
Investments In And Advances To Affiliates [Line Items]        
Beginning Value 49,819,600 49,883,320 49,855,000 [1] 49,876,240
United States Treasury Obligations 23,600 (7,080) (11,800)  
Ending Value 49,843,200 [2] 49,876,240 49,843,200 [2] 49,876,240
Dividend Income 33,734 655 36,736 8,075
Affiliated Investments [Member] | Money Market Mutual Fund - Invesco Government & Agency Portfolio, Institutional Class [Member]        
Investments In And Advances To Affiliates [Line Items]        
Beginning Value 730,191,695 182,384,345 576,603,758 195,533,756
Purchases at Cost 917,758,776 135,306,617 1,326,583,519 448,948,844
Proceeds from Sales (609,264,637) (84,096,480) (864,501,443) (410,888,118)
Ending Value 1,038,685,834 233,594,482 1,038,685,834 233,594,482
Dividend Income $ 1,707,199 $ 13,118 $ 1,816,210 $ 27,250
[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