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Investments - Fair Value of Derivative Instruments (Detail) - Not Designated as Hedging Instrument [Member] - USD ($) | Dec. 31, 2025 | Dec. 31, 2024
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Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivatives asset not accounted for as hedging instruments, Unrealized Appreciation | [1] | $ 884,104,723 | $ 177,852,443
Derivatives liability not accounted for as hedging instruments, Unrealized Depreciation | [1] | 247,609,492 | 125,399,038
VIX Futures Contracts [Member] | Receivable on open futures contracts [Member] | ProShares Short VIX Short-Term Futures ETF [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivatives asset not accounted for as hedging instruments, Unrealized Appreciation | [1] | 15,699,597 | 482,967
VIX Futures Contracts [Member] | Receivable on open futures contracts [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivatives asset not accounted for as hedging instruments, Unrealized Appreciation | [1] |  | 15,626,836
VIX Futures Contracts [Member] | Receivable on open futures contracts [Member] | ProShares VIX Mid-Term Futures ETF [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivatives asset not accounted for as hedging instruments, Unrealized Appreciation | [1] | 33,097 | 240,639
VIX Futures Contracts [Member] | Receivable on open futures contracts [Member] | ProShares VIX Short-Term Futures ETF [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivatives asset not accounted for as hedging instruments, Unrealized Appreciation | [1] |  | 5,943,933
VIX Futures Contracts [Member] | Payable on open futures contracts [Member] | ProShares Short VIX Short-Term Futures ETF [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivatives liability not accounted for as hedging instruments, Unrealized Depreciation | [1] |  | 3,491,718
VIX Futures Contracts [Member] | Payable on open futures contracts [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivatives liability not accounted for as hedging instruments, Unrealized Depreciation | [1] | 56,075,162 | 1,650,844
VIX Futures Contracts [Member] | Payable on open futures contracts [Member] | ProShares VIX Mid-Term Futures ETF [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivatives liability not accounted for as hedging instruments, Unrealized Depreciation | [1] | 2,068,646 | 218,373
VIX Futures Contracts [Member] | Payable on open futures contracts [Member] | ProShares VIX Short-Term Futures ETF [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivatives liability not accounted for as hedging instruments, Unrealized Depreciation | [1] | 21,568,263 | 1,550,606
Commodity Contracts [Member] | Receivables on open futures contracts and/or unrealized appreciation on swap agreements [Member] | ProShares Ultra Bloomberg Crude Oil [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivatives asset not accounted for as hedging instruments, Unrealized Appreciation | [1] |  | 49,079,695
Commodity Contracts [Member] | Receivables on open futures contracts and/or unrealized appreciation on swap agreements [Member] | ProShares Ultra Bloomberg Natural Gas [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivatives asset not accounted for as hedging instruments, Unrealized Appreciation | [1] |  | 97,239,201
Commodity Contracts [Member] | Receivables on open futures contracts and/or unrealized appreciation on swap agreements [Member] | ProShares Ultra Gold [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivatives asset not accounted for as hedging instruments, Unrealized Appreciation | [1] | 65,974,734 |
Commodity Contracts [Member] | Receivables on open futures contracts and/or unrealized appreciation on swap agreements [Member] | ProShares Ultra Silver [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivatives asset not accounted for as hedging instruments, Unrealized Appreciation | [1] | 733,158,657 |
Commodity Contracts [Member] | Receivables on open futures contracts and/or unrealized appreciation on swap agreements [Member] | ProShares UltraShort Bloomberg Crude Oil [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivatives asset not accounted for as hedging instruments, Unrealized Appreciation | [1] | 12,025,118 | 1,888,681
Commodity Contracts [Member] | Receivables on open futures contracts and/or unrealized appreciation on swap agreements [Member] | ProShares UltraShort Bloomberg Natural Gas [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivatives asset not accounted for as hedging instruments, Unrealized Appreciation | [1] | 53,943,537 |
Commodity Contracts [Member] | Receivables on open futures contracts and/or unrealized appreciation on swap agreements [Member] | ProShares UltraShort Gold [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivatives asset not accounted for as hedging instruments, Unrealized Appreciation | [1] |  | 262,637
Commodity Contracts [Member] | Receivables on open futures contracts and/or unrealized appreciation on swap agreements [Member] | ProShares UltraShort Silver [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivatives asset not accounted for as hedging instruments, Unrealized Appreciation | [1] | 2,243,402 | 3,465,933
Commodity Contracts [Member] | Payable on open futures contracts and/or unrealized depreciation on swap agreements [Member] | ProShares Ultra Bloomberg Crude Oil [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivatives liability not accounted for as hedging instruments, Unrealized Depreciation | [1] | 14,840,228 |
Commodity Contracts [Member] | Payable on open futures contracts and/or unrealized depreciation on swap agreements [Member] | ProShares Ultra Bloomberg Natural Gas [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivatives liability not accounted for as hedging instruments, Unrealized Depreciation | [1] | 132,096,872 |
Commodity Contracts [Member] | Payable on open futures contracts and/or unrealized depreciation on swap agreements [Member] | ProShares Ultra Gold [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivatives liability not accounted for as hedging instruments, Unrealized Depreciation | [1] |  | 2,771,540
Commodity Contracts [Member] | Payable on open futures contracts and/or unrealized depreciation on swap agreements [Member] | ProShares Ultra Silver [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivatives liability not accounted for as hedging instruments, Unrealized Depreciation | [1] |  | 81,422,443
Commodity Contracts [Member] | Payable on open futures contracts and/or unrealized depreciation on swap agreements [Member] | ProShares UltraShort Bloomberg Crude Oil [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivatives liability not accounted for as hedging instruments, Unrealized Depreciation | [1] |  | 3,544,073
Commodity Contracts [Member] | Payable on open futures contracts and/or unrealized depreciation on swap agreements [Member] | ProShares UltraShort Bloomberg Natural Gas [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivatives liability not accounted for as hedging instruments, Unrealized Depreciation | [1] |  | 26,130,504
Commodity Contracts [Member] | Payable on open futures contracts and/or unrealized depreciation on swap agreements [Member] | ProShares UltraShort Gold [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivatives liability not accounted for as hedging instruments, Unrealized Depreciation | [1] | 3,423,243 |
Commodity Contracts [Member] | Payable on open futures contracts and/or unrealized depreciation on swap agreements [Member] | ProShares UltraShort Silver [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivatives liability not accounted for as hedging instruments, Unrealized Depreciation | [1] | 15,842,400 |
Foreign Exchange Contracts [Member] | Unrealized appreciation on foreign currency forward contracts [Member] | ProShares Ultra Euro [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivatives asset not accounted for as hedging instruments, Unrealized Appreciation |  | 62,719 | 2,312
Foreign Exchange Contracts [Member] | Unrealized appreciation on foreign currency forward contracts [Member] | ProShares Ultra Yen [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivatives asset not accounted for as hedging instruments, Unrealized Appreciation |  | 1,161 | 146,194
Foreign Exchange Contracts [Member] | Unrealized appreciation on foreign currency forward contracts [Member] | ProShares UltraShort Euro [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivatives asset not accounted for as hedging instruments, Unrealized Appreciation |  | 7,632 | 1,189,827
Foreign Exchange Contracts [Member] | Unrealized appreciation on foreign currency forward contracts [Member] | ProShares UltraShort Yen [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivatives asset not accounted for as hedging instruments, Unrealized Appreciation |  | 955,069 | 2,283,588
Foreign Exchange Contracts [Member] | Unrealized depreciation on foreign currency forward contracts [Member] | ProShares Ultra Euro [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivatives liability not accounted for as hedging instruments, Unrealized Depreciation |  | 29 | 169,440
Foreign Exchange Contracts [Member] | Unrealized depreciation on foreign currency forward contracts [Member] | ProShares Ultra Yen [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivatives liability not accounted for as hedging instruments, Unrealized Depreciation |  | 1,183,809 | 4,361,491
Foreign Exchange Contracts [Member] | Unrealized depreciation on foreign currency forward contracts [Member] | ProShares UltraShort Euro [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivatives liability not accounted for as hedging instruments, Unrealized Depreciation |  | 400,006 | 32,777
Foreign Exchange Contracts [Member] | Unrealized depreciation on foreign currency forward contracts [Member] | ProShares UltraShort Yen [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivatives liability not accounted for as hedging instruments, Unrealized Depreciation |  | $ 110,834 | $ 55,229
[1] | Includes cumulative appreciation (depreciation) of futures contracts as reported in the Schedule of Investments. Only current day’s variation margin is reported within the Statements of Financial Condition in receivable/payable on open futures.

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