Organization - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2022 CreationUnit shares	Dec. 31, 2021 shares	Feb. 23, 2015 shares	Aug. 03, 2006 Trust
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of series of trust | Trust				7
General shares, shares issued	40	40	40
Treasury obligation measurement maximum maturity period	12 months
Number of shares issued per Creation Unit	100,000
Minimum number of Creation Units that can be purchased | CreationUnit	1
Invesco Capital Management LLC (Invesco) [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Purchase agreement transaction date	Feb. 23, 2015