Organization - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2022 CreationUnit shares	Dec. 31, 2021 shares
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
General shares, shares issued	40	40
Treasury obligation measurement maximum maturity period	12 months
Minimum number of Creation Units that can be purchased | CreationUnit	1
Number of shares issued per Creation Unit	100,000
Invesco Capital Management LLC [Member]
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Purchase agreement transaction date	Feb. 23, 2015