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Financial Highlights - Schedule of Net Asset Value Per Share (Detail) - $ / shares | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Net Asset Value |  |  |  |  |
Net asset value per Share, beginning of period |  | $ 18.9 | $ 17.9 | $ 16.73 | $ 18.42
Net realized and change in unrealized gain (loss) on United States Treasury Obligations, Affiliated Investments and Currency Futures Contracts | [1] | (0.27) | 0.81 | 1.59 | (0.12)
Net investment income (loss) | [2] | 0.17 | 0.21 | 0.48 | 0.62
Net income (loss) |  | (0.1) | 1.02 | 2.07 | 0.5
Net asset value per Share, end of period |  | 18.80 | 18.92 | 18.80 | 18.92
Market value per Share, beginning of period | [3] | 18.92 | 17.9 | 16.71 | 18.43
Market value per Share, end of period | [3] | $ 18.81 | $ 18.93 | $ 18.81 | $ 18.93
Ratio to average Net Assets |  |  |  |  |
Net investment income (loss) | [4] | 3.51% | 4.49% | 3.52% | 4.55%
Expenses, after waivers | [4] | 0.68% | 0.74% | 0.69% | 0.73%
Expenses, prior to waivers | [4] | 0.77% | 0.78% | 0.77% | 0.78%
Total Return, at net asset value | [4],[5] | (0.53%) | 5.70% | 12.37% | 2.71%
Total Return, at market value | [4],[5] | (0.58%) | 5.75% | 12.57% | 2.71%
[1] | Net realized and change in unrealized gain (loss) on United States Treasury Obligations, Affiliated Investments and Currency Futures Contracts per share may not correlate with the Fund’s net realized and unrealized gain (loss) due to timing of shareholder transactions in relation to the fluctuating market values of the Fund’s investments.
[2] | Based on average shares outstanding.
[3] | The mean between the last bid and ask prices.
[4] | Annualized.
[5] | Total Return, at NAV is calculated assuming an initial investment made at the NAV at the beginning of the period, reinvestment of all dividends and distributions at NAV during the period, and redemption of Shares at NAV on the last day of the period. Total Return, at NAV includes adjustments in accordance with U.S. GAAP and as such, the NAV for financial reporting purposes and the returns based upon those NAVs may differ from the NAVs and returns for shareholder transactions. Total Return, at market value is calculated assuming an initial investment made at the market value at the beginning of the period, reinvestment of all dividends and distributions at market value during the period, and redemption of Shares at the market value on the last day of the period. Not annualized for periods less than one year, if applicable.

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