v3.26.1
Investments - Fair Value of Derivative Instruments (Detail) - Not Designated as Hedging Instrument [Member] - USD ($)
Jun. 30, 2026
Dec. 31, 2025
Derivative Instruments, Gain (Loss) [Line Items]    
Derivatives asset not accounted for as hedging instruments, Unrealized Appreciation [1] $ 343,094,923 $ 884,104,723
Derivatives liability not accounted for as hedging instruments, Unrealized Depreciation [1] 399,058,517 247,609,492
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] 11,931,229 15,699,597
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] 0  
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] 0 33,097
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] 0  
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] 0  
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] 32,887,617 56,075,162
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] 3,601,639 2,068,646
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] 17,083,960 21,568,263
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] 2,087,777  
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] 4,878,818  
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] 0 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] 2,869,644 733,158,657
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] 285,027,123 12,025,118
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] 577,621 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] 17,917,713  
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] 15,939,794 2,243,402
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] 81,039,404 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] 0 132,096,872
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] 75,965,022  
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] 187,174,913  
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] 0  
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] 0 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] 171,104 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 576 62,719
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 7,708 1,161
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 943,149 7,632
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 913,771 955,069
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 126,416 29
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 958,033 1,183,809
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 44,573 400,006
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 $ 5,836 $ 110,834
[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.