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Significant Accounting Policies - Valuation of Investments using Fair Value Hierarchy (Detail) - USD ($)
Dec. 31, 2025
Dec. 31, 2024
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure $ 2,895,530,209 $ 526,273,030
ProShares Short VIX Short-Term Futures ETF [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure 75,607,395 21,929,124
ProShares Ultra Bloomberg Crude Oil [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure 134,735,261 148,831,195
ProShares Ultra Bloomberg Natural Gas [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure 102,176,162 196,990,701
ProShares Ultra Euro [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure 62,690 (167,128)
ProShares Ultra Gold [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure 614,680,893 72,042,085
ProShares Ultra Silver [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure 1,700,469,631 43,266,932
ProShares Ultra VIX Short-Term Futures ETF [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure 43,700,404 38,913,867
ProShares Ultra Yen [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure (1,182,648) (4,215,297)
ProShares UltraShort Bloomberg Crude Oil [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure 56,938,717 (1,655,392)
ProShares UltraShort Bloomberg Natural Gas [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure 123,764,630 (26,130,504)
ProShares UltraShort Euro [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure (392,374) 1,157,050
ProShares UltraShort Gold [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure (3,423,243) 262,637
ProShares UltraShort Silver [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure (13,598,998) 3,465,933
ProShares UltraShort Yen [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure 844,235 2,228,359
ProShares VIX Mid-Term Futures ETF [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure (2,035,549) 22,266
ProShares VIX Short-Term Futures ETF [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure 63,183,003 29,331,202
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure 2,259,034,978 473,819,625
Level I - Quoted Prices [Member] | Futures Contracts [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure [1] 312,613,079 67,006,252
Level I - Quoted Prices [Member] | ProShares Short VIX Short-Term Futures ETF [Member] | Short-Term U.S. Government and Agencies [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure 59,907,798 24,937,875
Level I - Quoted Prices [Member] | ProShares Short VIX Short-Term Futures ETF [Member] | Futures Contracts [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure [1] 15,699,597 (3,008,751)
Level I - Quoted Prices [Member] | ProShares Ultra Bloomberg Crude Oil [Member] | Short-Term U.S. Government and Agencies [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure 149,575,489 99,751,500
Level I - Quoted Prices [Member] | ProShares Ultra Bloomberg Crude Oil [Member] | Futures Contracts [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure [1] (3,689,107) 10,864,085
Level I - Quoted Prices [Member] | ProShares Ultra Bloomberg Natural Gas [Member] | Short-Term U.S. Government and Agencies [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure 234,273,034 99,751,500
Level I - Quoted Prices [Member] | ProShares Ultra Bloomberg Natural Gas [Member] | Futures Contracts [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure [1] (132,096,872) 97,239,201
Level I - Quoted Prices [Member] | ProShares Ultra Gold [Member] | Short-Term U.S. Government and Agencies [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure 548,706,159 74,813,625
Level I - Quoted Prices [Member] | ProShares Ultra Gold [Member] | Futures Contracts [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure [1] 37,298,279 (423,408)
Level I - Quoted Prices [Member] | ProShares Ultra Silver [Member] | Short-Term U.S. Government and Agencies [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure 967,310,974 124,689,375
Level I - Quoted Prices [Member] | ProShares Ultra Silver [Member] | Futures Contracts [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure [1] 419,245,399 (28,903,535)
Level I - Quoted Prices [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member] | Short-Term U.S. Government and Agencies [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure 99,775,566 24,937,875
Level I - Quoted Prices [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member] | Futures Contracts [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure [1] (56,075,162) 13,975,992
Level I - Quoted Prices [Member] | ProShares UltraShort Bloomberg Crude Oil [Member] | Short-Term U.S. Government and Agencies [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure 44,913,599  
Level I - Quoted Prices [Member] | ProShares UltraShort Bloomberg Crude Oil [Member] | Futures Contracts [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure [1] 12,025,118 (1,655,392)
Level I - Quoted Prices [Member] | ProShares UltraShort Bloomberg Natural Gas [Member] | Short-Term U.S. Government and Agencies [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure 69,821,093  
Level I - Quoted Prices [Member] | ProShares UltraShort Bloomberg Natural Gas [Member] | Futures Contracts [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure [1] 53,943,537 (26,130,504)
Level I - Quoted Prices [Member] | ProShares UltraShort Gold [Member] | Futures Contracts [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure [1] (855,047) 121,056
Level I - Quoted Prices [Member] | ProShares UltraShort Silver [Member] | Futures Contracts [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure [1] (9,278,851) 511,915
Level I - Quoted Prices [Member] | ProShares VIX Mid-Term Futures ETF [Member] | Futures Contracts [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure [1] (2,035,549) 22,266
Level I - Quoted Prices [Member] | ProShares VIX Short-Term Futures ETF [Member] | Short-Term U.S. Government and Agencies [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure 84,751,266 24,937,875
Level I - Quoted Prices [Member] | ProShares VIX Short-Term Futures ETF [Member] | Futures Contracts [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure [1] (21,568,263) 4,393,327
Level II - Other Significant Observable Inputs [Member] | Foreign Currency Forward Contracts [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure (668,097) (997,016)
Level II - Other Significant Observable Inputs [Member] | Swap Agreements [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure 324,550,249 (13,555,831)
Level II - Other Significant Observable Inputs [Member] | ProShares Ultra Bloomberg Crude Oil [Member] | Swap Agreements [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure (11,151,121) 38,215,610
Level II - Other Significant Observable Inputs [Member] | ProShares Ultra Euro [Member] | Foreign Currency Forward Contracts [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure 62,690 (167,128)
Level II - Other Significant Observable Inputs [Member] | ProShares Ultra Gold [Member] | Swap Agreements [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure 28,676,455 (2,348,132)
Level II - Other Significant Observable Inputs [Member] | ProShares Ultra Silver [Member] | Swap Agreements [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure 313,913,258 (52,518,908)
Level II - Other Significant Observable Inputs [Member] | ProShares Ultra Yen [Member] | Foreign Currency Forward Contracts [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure (1,182,648) (4,215,297)
Level II - Other Significant Observable Inputs [Member] | ProShares UltraShort Euro [Member] | Foreign Currency Forward Contracts [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure (392,374) 1,157,050
Level II - Other Significant Observable Inputs [Member] | ProShares UltraShort Gold [Member] | Swap Agreements [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure (2,568,196) 141,581
Level II - Other Significant Observable Inputs [Member] | ProShares UltraShort Silver [Member] | Swap Agreements [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure (4,320,147) 2,954,018
Level II - Other Significant Observable Inputs [Member] | ProShares UltraShort Yen [Member] | Foreign Currency Forward Contracts [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investments, fair value disclosure $ 844,235 $ 2,228,359
[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.