v3.25.2
Agreements - Additional Information (Detail)
 6 Months Ended
Jun. 30, 2025
USD ($)
Summary of Investment Holdings [Line Items]  
Ceiling for legal fees $ 100,000
Percentage of annual NAV as limit to pay SEC registration fees incurred 0.021%
Ceiling for per annum K-1 preparation and mailing fees against annual net assets of Fund 0.10%
Leveraged Fund [Member]  
Summary of Investment Holdings [Line Items]  
Management Fee paid to sponsor, percent per annum of the average daily NAV of each Geared Fund 0.95%
GearedVix Funds [Member]  
Summary of Investment Holdings [Line Items]  
Management Fee paid to sponsor, percent per annum of the average daily NAV of each Geared Fund 0.95%
ProShares Short Euro [Member]  
Summary of Investment Holdings [Line Items]  
Management Fee paid to sponsor, percent per annum of the average daily NAV of each Geared Fund 0.95%
Matching VIX Funds [Member]  
Summary of Investment Holdings [Line Items]  
Management Fee paid to sponsor, percent per annum of the average daily NAV of each Geared Fund 0.85%