Significant Accounting Policies - Valuation of Investments using Fair Value Hierarchy (Detail) - USD ($)
|
Jun. 30, 2018 |
Dec. 31, 2017 |
| ProShares Short Euro [Member] |
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| Significant Accounting Policies [Line Items] |
|
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| Investments, fair value disclosure |
$ 5,774,277
|
$ 6,829,947
|
| ProShares Short VIX Short-Term Futures ETF [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
70,467,597
|
511,952,093
|
| ProShares Ultra Bloomberg Crude Oil [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
465,673,601
|
533,700,242
|
| ProShares Ultra Bloomberg Natural Gas [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
17,841,803
|
58,187,166
|
| ProShares Ultra Euro [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
3,116,986
|
7,260,387
|
| ProShares Ultra Gold [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
80,679,374
|
92,536,679
|
| ProShares Ultra Silver [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
198,352,203
|
257,318,650
|
| ProShares Ultra VIX Short-Term Futures ETF [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
83,060,057
|
253,067,012
|
| ProShares Ultra Yen [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
973,825
|
1,963,109
|
| Proshares Ultra Pro 3x Crude Oil ETF [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
9,905,484
|
1,417,998
|
| ProShares UltraPro 3X Short Crude Oil ETF [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
(5,442,454)
|
(2,988,155)
|
| ProShares UltraShort Australian Dollar [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
5,380,099
|
11,090,684
|
| ProShares UltraShort Bloomberg Crude Oil [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
132,722,064
|
219,077,033
|
| ProShares UltraShort Bloomberg Natural Gas [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
4,099,474
|
2,902,702
|
| ProShares UltraShort Euro [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
145,052,935
|
198,425,897
|
| ProShares UltraShort Gold [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
25,246,424
|
30,484,181
|
| ProShares UltraShort Silver [Member] |
|
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| Significant Accounting Policies [Line Items] |
|
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| Investments, fair value disclosure |
21,433,180
|
16,632,048
|
| ProShares UltraShort Yen [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
81,530,454
|
133,361,615
|
| ProShares VIX Mid-Term Futures ETF [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
(378,240)
|
18,778,235
|
| ProShares VIX Short-Term Futures ETF [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
31,425,513
|
130,083,727
|
| Total Trust [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
1,376,914,656
|
2,482,081,250
|
| Level I - Quoted Prices [Member] | ProShares Short Euro [Member] | Short-Term U.S. Government and Agencies [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
5,687,064
|
6,996,235
|
| Level I - Quoted Prices [Member] | ProShares Short Euro [Member] | Futures Contracts [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
87,213
|
(166,288)
|
| Level I - Quoted Prices [Member] | ProShares Short VIX Short-Term Futures ETF [Member] | Short-Term U.S. Government and Agencies [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
92,995,995
|
494,910,644
|
| Level I - Quoted Prices [Member] | ProShares Short VIX Short-Term Futures ETF [Member] | Futures Contracts [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
(22,528,398)
|
17,041,449
|
| Level I - Quoted Prices [Member] | ProShares Ultra Bloomberg Crude Oil [Member] | Short-Term U.S. Government and Agencies [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
365,955,628
|
459,515,902
|
| Level I - Quoted Prices [Member] | ProShares Ultra Bloomberg Crude Oil [Member] | Futures Contracts [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
17,289,103
|
11,945,979
|
| Level I - Quoted Prices [Member] | ProShares Ultra Bloomberg Natural Gas [Member] | Short-Term U.S. Government and Agencies [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
17,960,426
|
50,961,356
|
| Level I - Quoted Prices [Member] | ProShares Ultra Bloomberg Natural Gas [Member] | Futures Contracts [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
(118,623)
|
7,225,810
|
| Level I - Quoted Prices [Member] | ProShares Ultra Euro [Member] | Short-Term U.S. Government and Agencies [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
3,289,040
|
6,996,235
|
| Level I - Quoted Prices [Member] | ProShares Ultra Gold [Member] | Short-Term U.S. Government and Agencies [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
87,847,390
|
88,884,844
|
| Level I - Quoted Prices [Member] | ProShares Ultra Gold [Member] | Futures Contracts [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
(15,120)
|
5,480
|
| Level I - Quoted Prices [Member] | ProShares Ultra Silver [Member] | Short-Term U.S. Government and Agencies [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
212,508,884
|
235,581,716
|
| Level I - Quoted Prices [Member] | ProShares Ultra Silver [Member] | Futures Contracts [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
(7,970)
|
1,600
|
| Level I - Quoted Prices [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member] | Short-Term U.S. Government and Agencies [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
42,998,148
|
287,533,132
|
| Level I - Quoted Prices [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member] | Futures Contracts [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
39,797,429
|
(34,466,120)
|
| Level I - Quoted Prices [Member] | ProShares Ultra Yen [Member] | Short-Term U.S. Government and Agencies [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
998,084
|
1,997,933
|
| Level I - Quoted Prices [Member] | Proshares Ultra Pro 3x Crude Oil ETF [Member] | Futures Contracts [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
9,905,484
|
1,417,998
|
| Level I - Quoted Prices [Member] | ProShares UltraPro 3X Short Crude Oil ETF [Member] | Futures Contracts [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
(5,442,454)
|
(2,988,155)
|
| Level I - Quoted Prices [Member] | ProShares UltraShort Australian Dollar [Member] | Short-Term U.S. Government and Agencies [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
4,988,329
|
11,983,904
|
| Level I - Quoted Prices [Member] | ProShares UltraShort Australian Dollar [Member] | Futures Contracts [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
391,770
|
(893,220)
|
| Level I - Quoted Prices [Member] | ProShares UltraShort Bloomberg Crude Oil [Member] | Short-Term U.S. Government and Agencies [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
173,652,213
|
253,646,823
|
| Level I - Quoted Prices [Member] | ProShares UltraShort Bloomberg Crude Oil [Member] | Futures Contracts [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
(7,161,949)
|
(3,962,648)
|
| Level I - Quoted Prices [Member] | ProShares UltraShort Bloomberg Natural Gas [Member] | Short-Term U.S. Government and Agencies [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
4,093,202
|
3,999,751
|
| Level I - Quoted Prices [Member] | ProShares UltraShort Bloomberg Natural Gas [Member] | Futures Contracts [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
6,272
|
(1,097,049)
|
| Level I - Quoted Prices [Member] | ProShares UltraShort Euro [Member] | Short-Term U.S. Government and Agencies [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
141,652,985
|
204,770,166
|
| Level I - Quoted Prices [Member] | ProShares UltraShort Gold [Member] | Short-Term U.S. Government and Agencies [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
22,954,734
|
31,977,900
|
| Level I - Quoted Prices [Member] | ProShares UltraShort Gold [Member] | Futures Contracts [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
15,080
|
(5,460)
|
| Level I - Quoted Prices [Member] | ProShares UltraShort Silver [Member] | Short-Term U.S. Government and Agencies [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
19,972,425
|
18,349,861
|
| Level I - Quoted Prices [Member] | ProShares UltraShort Silver [Member] | Futures Contracts [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
7,970
|
(1,650)
|
| Level I - Quoted Prices [Member] | ProShares UltraShort Yen [Member] | Short-Term U.S. Government and Agencies [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
80,837,136
|
131,834,352
|
| Level I - Quoted Prices [Member] | ProShares VIX Mid-Term Futures ETF [Member] | Short-Term U.S. Government and Agencies [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
|
20,993,515
|
| Level I - Quoted Prices [Member] | ProShares VIX Mid-Term Futures ETF [Member] | Futures Contracts [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
(378,240)
|
(2,215,280)
|
| Level I - Quoted Prices [Member] | ProShares VIX Short-Term Futures ETF [Member] | Short-Term U.S. Government and Agencies [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
21,999,053
|
134,845,604
|
| Level I - Quoted Prices [Member] | ProShares VIX Short-Term Futures ETF [Member] | Futures Contracts [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
9,426,460
|
(4,761,877)
|
| Level I - Quoted Prices [Member] | Total Trust [Member] | Short-Term U.S. Government and Agencies [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
1,300,390,736
|
2,445,779,873
|
| Level I - Quoted Prices [Member] | Total Trust [Member] | Futures Contracts [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
41,274,027
|
(12,919,431)
|
| Level II - Other Significant Observable Inputs [Member] | ProShares Ultra Bloomberg Crude Oil [Member] | Swap Agreements [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
82,428,870
|
62,238,361
|
| Level II - Other Significant Observable Inputs [Member] | ProShares Ultra Euro [Member] | Foreign Currency Forward Contracts [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
(172,054)
|
264,152
|
| Level II - Other Significant Observable Inputs [Member] | ProShares Ultra Gold [Member] | Forward Agreements [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
(7,152,896)
|
3,646,355
|
| Level II - Other Significant Observable Inputs [Member] | ProShares Ultra Silver [Member] | Forward Agreements [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
(14,148,711)
|
21,735,334
|
| Level II - Other Significant Observable Inputs [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member] | Swap Agreements [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
264,480
|
|
| Level II - Other Significant Observable Inputs [Member] | ProShares Ultra Yen [Member] | Foreign Currency Forward Contracts [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
(24,259)
|
(34,824)
|
| Level II - Other Significant Observable Inputs [Member] | ProShares UltraShort Bloomberg Crude Oil [Member] | Swap Agreements [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
(33,768,200)
|
(30,607,142)
|
| Level II - Other Significant Observable Inputs [Member] | ProShares UltraShort Euro [Member] | Foreign Currency Forward Contracts [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
3,399,950
|
(6,344,269)
|
| Level II - Other Significant Observable Inputs [Member] | ProShares UltraShort Gold [Member] | Forward Agreements [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
2,276,610
|
(1,488,259)
|
| Level II - Other Significant Observable Inputs [Member] | ProShares UltraShort Silver [Member] | Forward Agreements [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
1,452,785
|
(1,716,163)
|
| Level II - Other Significant Observable Inputs [Member] | ProShares UltraShort Yen [Member] | Foreign Currency Forward Contracts [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
693,318
|
1,527,263
|
| Level II - Other Significant Observable Inputs [Member] | Total Trust [Member] | Forward Agreements [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
(17,572,212)
|
22,177,267
|
| Level II - Other Significant Observable Inputs [Member] | Total Trust [Member] | Foreign Currency Forward Contracts [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
3,896,955
|
(4,587,678)
|
| Level II - Other Significant Observable Inputs [Member] | Total Trust [Member] | Swap Agreements [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
$ 48,925,150
|
$ 31,631,219
|