v3.21.1

Investments - Effect of Derivative Instruments on Statements of Operations (Detail) - USD ($) | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized Gain (Loss) on Derivatives Recognized in Income |  | $ (477,186,271) | $ 26,787,188 | [1]
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income |  | (389,847,943) | (58,422,629) | [1]
ProShares VIX Short-Term Futures ETF [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized Gain (Loss) on Derivatives Recognized in Income |  | (76,634,593) | 325,737,788 |
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income |  | (53,430,854) | 67,902,244 |
ProShares VIX Mid-Term Futures ETF [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized Gain (Loss) on Derivatives Recognized in Income |  | 3,539,316 | 7,756,525 |
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income |  | (8,275,522) | 15,982,870 |
ProShares Short VIX Short-Term Futures ETF [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized Gain (Loss) on Derivatives Recognized in Income |  | 24,209,417 | (244,300,604) |
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income |  | 42,125,118 | 21,055,658 |
ProShares Ultra VIX Short-Term Futures ETF [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized Gain (Loss) on Derivatives Recognized in Income |  | (704,499,504) | 726,085,231 |
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income |  | (284,359,331) | 176,516,915 |
ProShares UltraShort Bloomberg Crude Oil [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized Gain (Loss) on Derivatives Recognized in Income |  | (49,177,765) | 51,674,002 |
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income |  | 5,638,844 | 76,581,357 |
ProShares UltraShort Bloomberg Natural Gas [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized Gain (Loss) on Derivatives Recognized in Income |  | (6,359,394) | 5,626,177 |
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income |  | 15,895,064 | 3,335,611 |
ProShares UltraShort Gold [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized Gain (Loss) on Derivatives Recognized in Income |  | 4,003,359 | (5,930,882) |
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income |  | (179,853) | 2,676,974 |
ProShares UltraShort Silver [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized Gain (Loss) on Derivatives Recognized in Income |  | (2,932,266) | 842,240 |
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income |  | 7,466,511 | 4,190,456 |
ProShares Ultra Bloomberg Crude Oil [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized Gain (Loss) on Derivatives Recognized in Income |  | 334,351,228 | (505,553,797) |
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income |  | 35,035,656 | (322,421,661) |
ProShares Ultra Bloomberg Natural Gas [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized Gain (Loss) on Derivatives Recognized in Income |  | 41,582,936 | (22,818,551) |
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income |  | (17,798,868) | (4,437,037) |
ProShares Ultra Gold [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized Gain (Loss) on Derivatives Recognized in Income |  | (51,247,887) | 21,498,056 |
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income |  | (1,232,503) | (19,097,360) |
ProShares Ultra Silver [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized Gain (Loss) on Derivatives Recognized in Income |  | 4,910,742 | (3,697,654) |
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income |  | (137,743,781) | (85,061,831) |
ProShares Short Euro [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized Gain (Loss) on Derivatives Recognized in Income |  | 69,393 | (18,638) |
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income |  | 78,642 | 67,294 |
ProShares UltraShort Australian Dollar [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized Gain (Loss) on Derivatives Recognized in Income |  | (164,544) | 670,950 |
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income |  | 206,052 | 947,380 |
ProShares UltraShort Euro [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized Gain (Loss) on Derivatives Recognized in Income |  | 70,527 | 1,047,283 |
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income |  | 4,392,237 | 3,190,251 |
ProShares UltraShort Yen [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized Gain (Loss) on Derivatives Recognized in Income |  | 1,259,573 | (506,520) |
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income |  | 2,901,742 | (697,069) |
ProShares Ultra Euro [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized Gain (Loss) on Derivatives Recognized in Income |  | (27,342) | (53,268) |
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income |  | (311,052) | (221,542) |
ProShares Ultra Yen [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized Gain (Loss) on Derivatives Recognized in Income |  | (139,467) | (8,483) |
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income |  | (256,045) | (19,313) |
Not Designated as Hedging Instrument [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized Gain (Loss) on Derivatives Recognized in Income |  | (477,206,032) | 26,610,754 |
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income |  | (389,954,228) | (59,383,746) |
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 |  | (76,634,593) | 325,737,788 |
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income |  | (53,438,914) | 67,783,030 |
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 |  | 3,539,316 | 7,756,525 |
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income |  | (8,276,672) | 15,963,130 |
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 |  | 24,209,417 | (244,300,604) |
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income |  | 42,121,892 | 20,973,802 |
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 |  | (704,518,024) | 726,085,231 |
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income |  | (284,378,776) | 176,381,861 |
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Net realized gain (loss) on futures contracts and swap agreements/changes in unrealized appreciation (depreciation) on futures contracts and swap agreements [Member] | ProShares UltraShort Bloomberg Crude Oil [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized Gain (Loss) on Derivatives Recognized in Income |  | (49,177,765) | 51,674,022 |
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income |  | 5,636,634 | 76,578,230 |
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Net realized gain (loss) on futures contracts and swap agreements/changes in unrealized appreciation (depreciation) on futures contracts and swap agreements [Member] | ProShares UltraShort Bloomberg Natural Gas [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized Gain (Loss) on Derivatives Recognized in Income |  | (6,359,394) | 5,626,177 |
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income |  | 15,893,547 | 3,334,986 |
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Net realized gain (loss) on futures contracts and swap agreements/changes in unrealized appreciation (depreciation) on futures contracts and swap agreements [Member] | ProShares UltraShort Gold [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized Gain (Loss) on Derivatives Recognized in Income |  | 4,003,190 | (5,930,882) |
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income |  | (180,664) | 2,675,796 |
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Net realized gain (loss) on futures contracts and swap agreements/changes in unrealized appreciation (depreciation) on futures contracts and swap agreements [Member] | ProShares UltraShort Silver [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized Gain (Loss) on Derivatives Recognized in Income |  | (2,932,351) | 842,240 |
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income |  | 7,465,764 | 4,190,271 |
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Net realized gain (loss) on futures contracts and swap agreements/changes in unrealized appreciation (depreciation) on futures contracts and swap agreements [Member] | ProShares Ultra Bloomberg Crude Oil [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized Gain (Loss) on Derivatives Recognized in Income |  | 334,351,228 | (505,591,266) |
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income |  | 34,994,083 | (322,776,550) |
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Net realized gain (loss) on futures contracts and swap agreements/changes in unrealized appreciation (depreciation) on futures contracts and swap agreements [Member] | ProShares Ultra Bloomberg Natural Gas [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized Gain (Loss) on Derivatives Recognized in Income |  | 41,582,385 | (22,819,605) |
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income |  | (17,800,783) | (4,466,823) |
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Net realized gain (loss) on futures contracts and swap agreements/changes in unrealized appreciation (depreciation) on futures contracts and swap agreements [Member] | ProShares Ultra Gold [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized Gain (Loss) on Derivatives Recognized in Income |  | (51,248,132) | 21,498,056 |
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income |  | (1,234,299) | (19,153,296) |
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Net realized gain (loss) on futures contracts and swap agreements/changes in unrealized appreciation (depreciation) on futures contracts and swap agreements [Member] | ProShares Ultra Silver [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized Gain (Loss) on Derivatives Recognized in Income |  | 4,910,551 | (3,697,654) |
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income |  | (137,765,702) | (85,172,612) |
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Net realized gain (loss) on futures contracts and swap agreements/changes in unrealized appreciation (depreciation) on futures contracts and swap agreements [Member] | Proshares UltraPro 3X Crude Oil ETF [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized Gain (Loss) on Derivatives Recognized in Income | [2] |  | (414,693,599) |
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income | [2] |  | (7,266,550) |
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Net realized gain (loss) on futures contracts and swap agreements/changes in unrealized appreciation (depreciation) on futures contracts and swap agreements [Member] | ProShares UltraPro 3X Short Crude Oil ETF [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized Gain (Loss) on Derivatives Recognized in Income | [2] |  | 83,293,001 |
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income | [2] |  | 8,358,056 |
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 futures and/or foreign currency forward contracts [Member] | ProShares Short Euro [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized Gain (Loss) on Derivatives Recognized in Income |  | 69,393 | (18,638) |
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income |  | 78,554 | 67,324 |
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 futures and/or foreign currency forward contracts [Member] | ProShares UltraShort Australian Dollar [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized Gain (Loss) on Derivatives Recognized in Income |  | (164,544) | 670,950 |
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income |  | 206,052 | 947,586 |
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 futures and/or foreign currency forward contracts [Member] | ProShares UltraShort Euro [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized Gain (Loss) on Derivatives Recognized in Income |  | 70,527 | 1,047,283 |
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income |  | 4,391,397 | 3,137,931 |
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 futures and/or foreign currency forward contracts [Member] | ProShares UltraShort Yen [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized Gain (Loss) on Derivatives Recognized in Income |  | 1,259,573 | (506,520) |
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income |  | 2,900,888 | (699,345) |
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 futures and/or foreign currency forward contracts [Member] | ProShares Ultra Euro [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized Gain (Loss) on Derivatives Recognized in Income |  | (27,342) | (53,268) |
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income |  | (311,140) | (221,334) |
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 futures and/or foreign currency forward contracts [Member] | ProShares Ultra Yen [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Realized Gain (Loss) on Derivatives Recognized in Income |  | (139,467) | (8,483) |
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income |  | $ (256,089) | $ (19,239) |
[1] | The operations include the activity of ProShares UltraPro 3x Crude Oil ETF and ProShares UltraPro 3x Short Crude Oil ETF through March 27, 2020, the date liquidation was determined to be imminent.
[2] | The operations include the activity through March 27, 2020, the date liquidation was determined to be imminent.

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