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Investments - Fair Value of Derivative Instruments (Detail) - Not Designated as Hedging Instrument [Member] - USD ($)
Dec. 31, 2025
Dec. 31, 2024
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.