v3.25.2
Investments - Fair Value of Derivative Instruments (Detail) - Not Designated as Hedging Instrument [Member] - USD ($)
Jun. 30, 2025
Dec. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items]    
Derivatives asset not accounted for as hedging instruments, Unrealized Appreciation [1] $ 78,043,753 $ 177,852,443
Derivatives liability not accounted for as hedging instruments, Unrealized Depreciation [1] 121,586,257 125,399,038
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] 10,392,342 482,967
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] 165,078 240,639
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] 55,376,766 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] 353,745 218,373
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] 10,141,713 1,550,606
Commodities 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] 7,306,161 49,079,695
Commodities 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
Commodities 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] 15,855,988 1,888,681
Commodities 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] 40,226,449  
Commodities 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] 1,870,449 262,637
Commodities 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] 905,332 3,465,933
Commodities 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] 29,767,704  
Commodities 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] 8,181,646 2,771,540
Commodities 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] 15,609,321 81,422,443
Commodities 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
Commodities 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
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 446,814 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 764,251 146,194
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 110,889 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   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 3,294 169,440
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 27,879 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 1,837,188 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 $ 287,001 $ 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.