Significant Accounting Policies - Valuation of Investments using Fair Value Hierarchy (Detail) - USD ($)
|
Sep. 30, 2017 |
Dec. 31, 2016 |
| ProShares VIX Short-Term Futures ETF [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
$ 168,387,108
|
$ 147,522,581
|
| ProShares VIX Mid-Term Futures ETF [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
34,013,638
|
44,197,990
|
| ProShares Short VIX Short-Term Futures ETF [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
864,378,556
|
160,086,825
|
| ProShares Ultra VIX Short-Term Futures ETF [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
419,552,069
|
426,699,558
|
| ProShares UltraShort Bloomberg Crude Oil [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
227,620,440
|
192,060,689
|
| Pro Shares UltraPro 3X Short Crude Oil ETF [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
(2,423,370)
|
|
| ProShares UltraShort Bloomberg Natural Gas [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
3,347,218
|
2,417,120
|
| ProShares UltraShort Gold [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
37,892,152
|
63,593,101
|
| ProShares UltraShort Silver [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
20,123,602
|
22,961,875
|
| ProShares Short Euro [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
6,104,639
|
13,297,728
|
| ProShares UltraShort Australian Dollar [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
8,377,401
|
14,091,959
|
| ProShares UltraShort Euro [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
223,584,243
|
353,538,718
|
| ProShares UltraShort Yen [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
147,065,796
|
273,847,250
|
| ProShares Ultra Bloomberg Crude Oil [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
616,974,290
|
945,945,743
|
| Proshares Ultra Pro 3X Crude Oil ETF [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
1,272,779
|
|
| ProShares Ultra Bloomberg Natural Gas [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
41,948,242
|
38,720,368
|
| ProShares Ultra Gold [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
93,456,673
|
90,906,554
|
| ProShares Ultra Silver [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
242,380,783
|
274,297,250
|
| ProShares Ultra Euro [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
10,786,405
|
11,317,821
|
| ProShares Ultra Yen [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
4,267,102
|
4,940,803
|
| Total Trust [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
3,169,109,766
|
3,080,443,933
|
| Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares VIX Short-Term Futures ETF [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
186,716,429
|
147,991,233
|
| Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares VIX Mid-Term Futures ETF [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
35,955,278
|
45,486,235
|
| Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares Short VIX Short-Term Futures ETF [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
770,134,521
|
170,396,436
|
| Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
521,315,100
|
434,671,795
|
| Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares UltraShort Bloomberg Crude Oil [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
246,666,306
|
205,694,385
|
| Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares UltraShort Bloomberg Natural Gas [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
2,998,697
|
2,899,151
|
| Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares UltraShort Gold [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
34,940,087
|
60,540,555
|
| Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares UltraShort Silver [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
17,966,229
|
21,550,319
|
| Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares Short Euro [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
5,998,433
|
13,164,828
|
| Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares UltraShort Australian Dollar [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
7,997,911
|
12,909,619
|
| Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares UltraShort Euro [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
219,684,550
|
337,375,787
|
| Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares UltraShort Yen [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
137,818,917
|
257,102,313
|
| Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares Ultra Bloomberg Crude Oil [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
562,359,737
|
885,050,007
|
| Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares Ultra Bloomberg Natural Gas [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
42,919,932
|
36,183,648
|
| Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares Ultra Gold [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
101,900,580
|
95,356,621
|
| Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares Ultra Silver [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
270,629,525
|
295,300,799
|
| Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares Ultra Euro [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
10,995,765
|
11,891,831
|
| Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares Ultra Yen [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
4,662,411
|
5,282,879
|
| Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | Total Trust [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
3,181,660,408
|
3,038,848,441
|
| Level I - Quoted Prices [Member] | Futures Contracts [Member] | ProShares VIX Short-Term Futures ETF [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
(18,329,321)
|
(468,652)
|
| Level I - Quoted Prices [Member] | Futures Contracts [Member] | ProShares VIX Mid-Term Futures ETF [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
(1,941,640)
|
(1,288,245)
|
| Level I - Quoted Prices [Member] | Futures Contracts [Member] | ProShares Short VIX Short-Term Futures ETF [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
94,244,035
|
(10,309,611)
|
| Level I - Quoted Prices [Member] | Futures Contracts [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
(101,763,031)
|
(7,972,237)
|
| Level I - Quoted Prices [Member] | Futures Contracts [Member] | ProShares UltraShort Bloomberg Crude Oil [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
(5,367,489)
|
(1,426,815)
|
| Level I - Quoted Prices [Member] | Futures Contracts [Member] | Pro Shares UltraPro 3X Short Crude Oil ETF [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
(2,423,370)
|
|
| Level I - Quoted Prices [Member] | Futures Contracts [Member] | ProShares UltraShort Bloomberg Natural Gas [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
348,521
|
(482,031)
|
| Level I - Quoted Prices [Member] | Futures Contracts [Member] | ProShares UltraShort Gold [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
(9,540)
|
18,980
|
| Level I - Quoted Prices [Member] | Futures Contracts [Member] | ProShares UltraShort Silver [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
4,940
|
27,310
|
| Level I - Quoted Prices [Member] | Futures Contracts [Member] | ProShares Short Euro [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
106,206
|
132,900
|
| Level I - Quoted Prices [Member] | Futures Contracts [Member] | ProShares UltraShort Australian Dollar [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
379,490
|
1,182,340
|
| Level I - Quoted Prices [Member] | Futures Contracts [Member] | ProShares Ultra Bloomberg Crude Oil [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
13,817,653
|
5,537,165
|
| Level I - Quoted Prices [Member] | Futures Contracts [Member] | Proshares Ultra Pro 3X Crude Oil ETF [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
1,272,779
|
|
| Level I - Quoted Prices [Member] | Futures Contracts [Member] | ProShares Ultra Bloomberg Natural Gas [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
(971,690)
|
2,536,720
|
| Level I - Quoted Prices [Member] | Futures Contracts [Member] | ProShares Ultra Gold [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
9,520
|
(18,960)
|
| Level I - Quoted Prices [Member] | Futures Contracts [Member] | ProShares Ultra Silver [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
(4,940)
|
(27,360)
|
| Level I - Quoted Prices [Member] | Futures Contracts [Member] | Total Trust [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
(20,627,877)
|
(12,558,496)
|
| Level II - Other Significant Observable Inputs [Member] | Forward Agreements [Member] | ProShares UltraShort Gold [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
2,961,605
|
3,033,566
|
| Level II - Other Significant Observable Inputs [Member] | Forward Agreements [Member] | ProShares UltraShort Silver [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
2,152,433
|
1,384,246
|
| Level II - Other Significant Observable Inputs [Member] | Forward Agreements [Member] | ProShares Ultra Gold [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
(8,453,427)
|
(4,431,107)
|
| Level II - Other Significant Observable Inputs [Member] | Forward Agreements [Member] | ProShares Ultra Silver [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
(28,243,802)
|
(20,976,189)
|
| Level II - Other Significant Observable Inputs [Member] | Forward Agreements [Member] | Total Trust [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
(31,583,191)
|
(20,989,484)
|
| Level II - Other Significant Observable Inputs [Member] | Foreign Currency Forward Contracts [Member] | ProShares UltraShort Euro [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
3,899,693
|
16,162,931
|
| Level II - Other Significant Observable Inputs [Member] | Foreign Currency Forward Contracts [Member] | ProShares UltraShort Yen [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
9,246,879
|
16,744,937
|
| Level II - Other Significant Observable Inputs [Member] | Foreign Currency Forward Contracts [Member] | ProShares Ultra Euro [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
(209,360)
|
(574,010)
|
| Level II - Other Significant Observable Inputs [Member] | Foreign Currency Forward Contracts [Member] | ProShares Ultra Yen [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
(395,309)
|
(342,076)
|
| Level II - Other Significant Observable Inputs [Member] | Foreign Currency Forward Contracts [Member] | Total Trust [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
12,541,903
|
31,991,782
|
| Level II - Other Significant Observable Inputs [Member] | Swap Agreements [Member] | ProShares UltraShort Bloomberg Crude Oil [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
(13,678,377)
|
(12,206,881)
|
| Level II - Other Significant Observable Inputs [Member] | Swap Agreements [Member] | ProShares Ultra Bloomberg Crude Oil [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
40,796,900
|
55,358,571
|
| Level II - Other Significant Observable Inputs [Member] | Swap Agreements [Member] | Total Trust [Member] |
|
|
| Significant Accounting Policies [Line Items] |
|
|
| Investments, fair value disclosure |
$ 27,118,523
|
$ 43,151,690
|