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Organization - Additional Information (Detail) | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2025 CreationUnit shares | Dec. 31, 2024 shares | Feb. 23, 2015 shares | Aug. 03, 2006 Series
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |
Number of series of trusts | Series |  |  |  | 5
General shares, shares issued | 40 | 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 | 50,000 |  |  |
Invesco Capital Management LLC [Member] |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |
Purchase agreement transaction date | Feb. 23, 2015 |  |  |

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