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Investments - Effect of Derivative Instruments on Statements of Operations (Detail) - USD ($) | 12 Months Ended
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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

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