Agreements - Additional Information (Detail)	9 Months Ended
Agreements - Additional Information (Detail)	Sep. 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%

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

ProShares Trust II 10-Q