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Investments - Effect of Derivative Instruments on Statements of Operations (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items]      
Realized Gain (Loss) on Derivatives Recognized in Income $ 1,036,108,135 $ (134,354,034) $ (2,716,520,875)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income 584,376,924 (8,466,544) 143,926,302
ProShares Short VIX Short-Term Futures ETF [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized Gain (Loss) on Derivatives Recognized in Income 36,989,198 42,054,765 160,494,706
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income 18,711,268 (15,661,228) 1,542,809
ProShares Ultra VIX Short-Term Futures ETF [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized Gain (Loss) on Derivatives Recognized in Income (366,306,992) (136,416,002) (940,103,052)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income (70,035,993) 45,166,711 5,368,159
ProShares VIX Mid-Term Futures ETF [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized Gain (Loss) on Derivatives Recognized in Income 2,901,125 (13,692,881) (38,709,532)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income (2,057,815) 3,767,942 1,039,896
ProShares VIX Short-Term Futures ETF [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized Gain (Loss) on Derivatives Recognized in Income (66,466,384) (23,816,423) (275,363,159)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income (25,947,419) 14,052,632 126,426
ProShares Ultra Bloomberg Crude Oil [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized Gain (Loss) on Derivatives Recognized in Income (28,212,710) 47,314,191 100,808,721
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income (63,916,460) 34,625,310 (86,020,999)
ProShares Ultra Bloomberg Natural Gas [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized Gain (Loss) on Derivatives Recognized in Income 140,707,507 (398,290,574) (2,080,655,811)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income (229,307,553) 53,645,757 354,183,787
ProShares Ultra Gold [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized Gain (Loss) on Derivatives Recognized in Income 419,725,491 85,341,533 21,400,830
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income 68,830,455 (9,937,400) (2,575,471)
ProShares Ultra Silver [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized Gain (Loss) on Derivatives Recognized in Income 870,715,186 176,632,029 7,175,146
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income 814,747,030 (90,982,802) (59,096,598)
ProShares UltraShort Bloomberg Crude Oil [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized Gain (Loss) on Derivatives Recognized in Income 59,511,109 4,436,570 12,367,670
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income 13,688,036 (24,101,673) 12,181,761
ProShares UltraShort Bloomberg Natural Gas [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized Gain (Loss) on Derivatives Recognized in Income 41,448,849 96,486,398 306,795,581
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income 80,087,267 (22,576,997) (89,455,705)
ProShares UltraShort Gold [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized Gain (Loss) on Derivatives Recognized in Income (24,038,943) (6,246,384) (2,180,686)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income (3,685,880) 606,689 347,791
ProShares UltraShort Silver [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized Gain (Loss) on Derivatives Recognized in Income (42,610,029) (8,286,334) 13,437,583
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income (17,064,931) 2,591,061 3,537,995
ProShares Ultra Euro [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized Gain (Loss) on Derivatives Recognized in Income 852,316 (576,761) 293,493
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income 229,818 (474,077) (108,707)
ProShares Ultra Yen [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized Gain (Loss) on Derivatives Recognized in Income (6,455,940) (6,562,004) (2,637,502)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income 3,032,649 (5,734,582) 534,736
ProShares UltraShort Euro [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized Gain (Loss) on Derivatives Recognized in Income (6,435,931) 2,514,606 (2,624,737)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income (1,549,424) 3,005,829 607,675
ProShares UltraShort Yen [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized Gain (Loss) on Derivatives Recognized in Income 3,784,283 4,753,237 2,979,874
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income (1,384,124) 3,540,284 1,712,747
Not Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized Gain (Loss) on Derivatives Recognized in Income 1,036,103,218 (134,427,155) (2,716,361,247)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income 584,041,826 (8,467,868) 144,054,886
Not Designated as Hedging Instrument [Member] | VIX Futures Contracts [Member] | Net realized gain (loss) on futures contracts/ changes in unrealized appreciation (depreciation) on futures contracts [Member] | ProShares Short VIX Short-Term Futures ETF [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized Gain (Loss) on Derivatives Recognized in Income 36,988,593 42,037,096 160,516,553
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income 18,708,348 (15,649,375) 1,548,243
Not Designated as Hedging Instrument [Member] | VIX Futures Contracts [Member] | Net realized gain (loss) on futures contracts/ changes in unrealized appreciation (depreciation) on futures contracts [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized Gain (Loss) on Derivatives Recognized in Income (366,312,175) (136,430,513) (940,116,773)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income (70,051,154) 45,159,903 5,371,542
Not Designated as Hedging Instrument [Member] | VIX Futures Contracts [Member] | Net realized gain (loss) on futures contracts/ changes in unrealized appreciation (depreciation) on futures contracts [Member] | ProShares VIX Mid-Term Futures ETF [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized Gain (Loss) on Derivatives Recognized in Income 2,901,041 (13,696,430) (38,709,532)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income (2,057,815) 3,767,942 1,045,547
Not Designated as Hedging Instrument [Member] | VIX Futures Contracts [Member] | Net realized gain (loss) on futures contracts/ changes in unrealized appreciation (depreciation) on futures contracts [Member] | ProShares VIX Short-Term Futures ETF [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized Gain (Loss) on Derivatives Recognized in Income (66,467,112) (23,820,030) (275,353,500)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income (25,961,590) 14,057,421 132,729
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Net realized gain (loss) on futures contracts and/or swap agreements/ changes in unrealized appreciation (depreciation) on futures contracts and/or swap agreements [Member] | ProShares Ultra Bloomberg Crude Oil [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized Gain (Loss) on Derivatives Recognized in Income (28,213,219) 47,301,021 100,867,538
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income (63,919,923) 34,639,992 (86,011,590)
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Net realized gain (loss) on futures contracts and/or swap agreements/ changes in unrealized appreciation (depreciation) on futures contracts and/or swap agreements [Member] | ProShares Ultra Bloomberg Natural Gas [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized Gain (Loss) on Derivatives Recognized in Income 140,707,545 (398,292,227) (2,080,656,703)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income (229,336,073) 53,632,131 354,221,039
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Net realized gain (loss) on futures contracts and/or swap agreements/ changes in unrealized appreciation (depreciation) on futures contracts and/or swap agreements [Member] | ProShares Ultra Gold [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized Gain (Loss) on Derivatives Recognized in Income 419,725,039 85,338,522 21,429,154
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income 68,746,274 (9,946,408) (2,563,686)
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Net realized gain (loss) on futures contracts and/or swap agreements/ changes in unrealized appreciation (depreciation) on futures contracts and/or swap agreements [Member] | ProShares Ultra Silver [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized Gain (Loss) on Derivatives Recognized in Income 870,714,831 176,627,257 7,222,003
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income 814,581,100 (90,995,970) (59,077,259)
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Net realized gain (loss) on futures contracts and/or swap agreements/ changes in unrealized appreciation (depreciation) on futures contracts and/or swap agreements [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized Gain (Loss) on Derivatives Recognized in Income 59,511,592 4,429,612 12,379,340
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income 13,680,510 (24,091,711) 12,191,426
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Net realized gain (loss) on futures contracts and/or swap agreements/ changes in unrealized appreciation (depreciation) on futures contracts and/or swap agreements [Member] | ProShares UltraShort Bloomberg Natural Gas [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized Gain (Loss) on Derivatives Recognized in Income 41,451,537 96,490,359 306,791,742
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income 80,074,041 (22,576,997) (89,442,905)
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Net realized gain (loss) on futures contracts and/or swap agreements/ changes in unrealized appreciation (depreciation) on futures contracts and/or swap agreements [Member] | ProShares UltraShort Gold [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized Gain (Loss) on Derivatives Recognized in Income (24,038,943) (6,246,384) (2,180,686)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income (3,685,880) 606,689 347,791
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Net realized gain (loss) on futures contracts and/or swap agreements/ changes in unrealized appreciation (depreciation) on futures contracts and/or swap agreements [Member] | ProShares UltraShort Silver [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized Gain (Loss) on Derivatives Recognized in Income (42,610,029) (8,286,334) 13,438,489
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income (17,064,931) 2,591,061 3,537,995
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contracts [Member] | Net realized gain (loss) on foreign currency forward contracts/ changes in unrealized appreciation (depreciation) on foreign currency forward contracts [Member] | ProShares Ultra Euro [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized Gain (Loss) on Derivatives Recognized in Income 852,316 (576,761)  
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income 229,818 (474,077)  
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contracts [Member] | Net realized gain (loss) on foreign currency forward contracts/ changes in unrealized appreciation (depreciation) on foreign currency forward contracts [Member] | ProShares Ultra Yen [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized Gain (Loss) on Derivatives Recognized in Income (6,455,940) (6,562,004)  
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income 3,032,649 (5,734,582)  
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contracts [Member] | Net realized gain (loss) on foreign currency forward contracts/ changes in unrealized appreciation (depreciation) on foreign currency forward contracts [Member] | ProShares UltraShort Euro [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized Gain (Loss) on Derivatives Recognized in Income (6,436,050) 2,509,965  
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income (1,549,424) 3,005,829  
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contracts [Member] | Net realized gain (loss) on foreign currency forward contracts/ changes in unrealized appreciation (depreciation) on foreign currency forward contracts [Member] | ProShares UltraShort Yen [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized Gain (Loss) on Derivatives Recognized in Income 3,784,192 4,749,696  
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income $ (1,384,124) $ 3,540,284  
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contracts [Member] | Net realized gain (loss) on futures and/ or foreign currency forward contracts/ changes in unrealized appreciation (depreciation) on foreign currency forward contracts | ProShares Ultra Euro [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized Gain (Loss) on Derivatives Recognized in Income     293,493
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income     (108,707)
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contracts [Member] | Net realized gain (loss) on futures and/ or foreign currency forward contracts/ changes in unrealized appreciation (depreciation) on foreign currency forward contracts | ProShares Ultra Yen [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized Gain (Loss) on Derivatives Recognized in Income     (2,637,502)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income     534,736
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contracts [Member] | Net realized gain (loss) on futures and/ or foreign currency forward contracts/ changes in unrealized appreciation (depreciation) on foreign currency forward contracts | ProShares UltraShort Euro [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized Gain (Loss) on Derivatives Recognized in Income     (2,624,737)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income     612,477
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contracts [Member] | Net realized gain (loss) on futures and/ or foreign currency forward contracts/ changes in unrealized appreciation (depreciation) on foreign currency forward contracts | ProShares UltraShort Yen [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized Gain (Loss) on Derivatives Recognized in Income     2,979,874
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income     $ 1,715,508