Investments in Affiliates - Summary of Transactions in, and Earnings from, Investments in Affiliates (Excluding Affiliated Money Market Funds) (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				$ 2,004,216,762
Change in Unrealized Appreciation (Depreciation)	$ (3,487,144)		$ (142,303)	(3,659,529)		$ (43,271)
Ending Value	2,667,017,135			2,667,017,135
Affiliated Investments [Member]
Investments In And Advances To Affiliates [Line Items]
Beginning Value	3,302,412,035		978,309,593	2,004,216,762		891,104,755
Purchases at Cost	2,170,355,736		1,093,405,462	4,866,627,842		2,059,503,193
Proceeds from Sales	(2,805,841,931)		(584,305,334)	(4,203,781,822)		(1,463,223,913)
Change in Unrealized Appreciation (Depreciation)	91,295		(25,686)	(45,647)
Ending Value	2,667,017,135		1,487,384,035	2,667,017,135		1,487,384,035
Dividend Income	5,137,747		81,416	5,610,274		170,993
Affiliated Investments [Member] | Invesco Government & Agency Portfolio, Institutional Class [Member]
Investments In And Advances To Affiliates [Line Items]
Beginning Value	3,109,688,290		797,334,599	1,811,356,075		710,155,447
Purchases at Cost	2,170,355,736		1,093,405,462	4,866,627,842		2,059,503,193
Proceeds from Sales	(2,805,841,931)		(584,305,334)	(4,203,781,822)		(1,463,223,913)
Ending Value	2,474,202,095		1,306,434,727	2,474,202,095		1,306,434,727
Dividend Income	5,007,250		79,036	5,468,164		141,694
Affiliated Investments [Member] | Invesco Treasury Collateral ETF [Member]
Investments In And Advances To Affiliates [Line Items]
Beginning Value	192,723,745		180,974,994	192,860,687	[1]	180,949,308
Change in Unrealized Appreciation (Depreciation)	91,295		(25,686)	(45,647)
Ending Value	192,815,040	[1]	180,949,308	192,815,040	[1]	180,949,308
Dividend Income	$ 130,497		$ 2,380	$ 142,110		$ 29,299

[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.