Investments in Affiliates -Summary of Transactions in, and Earnings from, Investments in Affiliates (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Investments in and Advances to Affiliates [Line Items]
Change in Unrealized Appreciation (Depreciation)	$ (276,037)	$ 67,543
Dividend Income	2,267,969	8,329,172
Invesco Short Term Treasury ETF
Investments in and Advances to Affiliates [Line Items]
Investment Owned, at Fair Value, Beginning Balance		73,590,524
Change in Unrealized Appreciation (Depreciation)		132,734
Investment Owned, at Fair Value, Ending Balance		73,723,258
Dividend Income		707,766
Affiliated Investments [Member]
Investments in and Advances to Affiliates [Line Items]
Investment Owned, at Fair Value, Beginning Balance	111,534,057	983,150,588
Purchases at Cost	230,844,037	333,149,680
Proceeds from Sales	(208,212,022)	(756,596,676)
Change in Unrealized Appreciation (Depreciation)		132,734
Investment Owned, at Fair Value, Ending Balance	134,166,072	559,836,326
Dividend Income	2,267,969	8,329,172
Affiliated Investments [Member] | Invesco Government & Agency Portfolio, Institutional Class
Investments in and Advances to Affiliates [Line Items]
Investment Owned, at Fair Value, Beginning Balance		909,560,064
Purchases at Cost		333,149,680
Proceeds from Sales		(756,596,676)
Investment Owned, at Fair Value, Ending Balance		486,113,068
Dividend Income		$ 7,621,406
Affiliated Investments [Member] | Money Market Mutual Fund - Invesco Government & Agency Portfolio, Institutional Class [Member]
Investments in and Advances to Affiliates [Line Items]
Investment Owned, at Fair Value, Beginning Balance	111,534,057
Purchases at Cost	230,844,037
Proceeds from Sales	(208,212,022)
Investment Owned, at Fair Value, Ending Balance	134,166,072
Dividend Income	$ 2,267,969