Investments in Affiliates -Summary of Transactions in, and Earnings from, Investments in Affiliates (Detail) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2022		Sep. 30, 2021	Sep. 30, 2022		Sep. 30, 2021
Investments In And Advances To Affiliates [Line Items]
Beginning Value				$ 626,458,758
United States Treasury Obligations	$ 482,703		$ 1,225	(889,460)		$ (2,329)
Ending Value	1,158,319,001			1,158,319,001
Affiliated Investments [Member]
Investments In And Advances To Affiliates [Line Items]
Beginning Value	1,088,529,034		283,470,722	626,458,758		245,409,996
Purchases at Cost	1,449,819,215		156,907,514	2,776,402,734		605,856,358
Proceeds from Sales	(1,379,905,241)		(134,229,066)	(2,244,406,684)		(545,117,184)
United States Treasury Obligations	(124,007)		(4,720)	(135,807)		(4,720)
Ending Value	1,158,319,001		306,144,450	1,158,319,001		306,144,450
Dividend Income	5,705,962		15,820	7,558,908		51,145
Affiliated Investments [Member] | Exchange-Traded Fund [Member]
Investments In And Advances To Affiliates [Line Items]
Beginning Value	49,843,200		49,876,240	49,855,000	[1]	49,876,240
Purchases at Cost	23,899,275			23,899,275
United States Treasury Obligations	(124,007)		(4,720)	(135,807)		(4,720)
Ending Value	73,618,468	[1]	49,871,520	73,618,468	[1]	49,871,520
Dividend Income	304,995			341,731		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	1,038,685,834		233,594,482	576,603,758		195,533,756
Purchases at Cost	1,425,919,940		156,907,514	2,752,503,459		605,856,358
Proceeds from Sales	(1,379,905,241)		(134,229,066)	(2,244,406,684)		(545,117,184)
Ending Value	1,084,700,533		256,272,930	1,084,700,533		256,272,930
Dividend Income	$ 5,400,967		$ 15,820	$ 7,217,177		$ 43,070

[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.