v3.8.0.1

Financial Highlights - Per Share Operating Performance (Detail) - $ / shares | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
ProShares VIX Short-Term Futures ETF [Member] |  |  |  |  |  |  |  |  |
Investment Company, Financial Highlights [Line Items] |  |  |  |  |  |  |  |  |
Net asset value, beginning balance | [1] | $ 42.69 |  | $ 180.57 |  | $ 84.86 |  | $ 264.84 |
Net investment income (loss) | [1] | (0.01) |  | (0.24) |  | (0.11) |  | (1.03) |
Net realized and unrealized gain (loss) | [1],[2] | (10.11) |  | (66.20) |  | (52.18) |  | (149.68) |
Change in net asset value from operations | [1] | (10.12) |  | (66.44) |  | (52.29) |  | (150.71) |
Net asset value, ending balance | [1] | 32.57 |  | 114.13 |  | 32.57 |  | 114.13 |
Market value per share, beginning balance | [1],[3] | 42.52 |  | 183.20 |  | 85.04 |  | 266.60 |
Market value per share, ending balance | [1],[3] | $ 32.53 |  | $ 113.32 |  | $ 32.53 |  | $ 113.32 |
Total Return, at net asset value | [1] | (23.70%) | [4] | (36.80%) | [5] | (61.60%) | [4] | (56.90%) | [5]
Total Return, at market value | [1] | (23.50%) | [4] | (38.10%) | [5] | (61.70%) | [4] | (57.50%) | [5]
Ratios to Average Net Assets |  |  |  |  |  |  |  |  |
Expense ratio | [1],[6] | 0.98% |  | 0.99% |  | 0.97% |  | 1.01% |
Expense ratio, excluding brokerage commissions | [1],[6] | 0.85% |  | 0.85% |  | 0.85% |  | 0.85% |
Net investment income (loss) | [1],[6] | (0.14%) |  | (0.73%) |  | (0.30%) |  | (0.78%) |
ProShares VIX Mid-Term Futures ETF [Member] |  |  |  |  |  |  |  |  |
Investment Company, Financial Highlights [Line Items] |  |  |  |  |  |  |  |  |
Net asset value, beginning balance |  | $ 27.46 |  | $ 51.98 |  | $ 42.14 |  | $ 53.96 |
Net investment income (loss) |  | (0.01) |  | (0.09) |  | (0.07) |  | (0.28) |
Net realized and unrealized gain (loss) | [2] | (2.25) |  | (6.14) |  | (16.87) |  | (7.93) |
Change in net asset value from operations |  | (2.26) |  | (6.23) |  | (16.94) |  | (8.21) |
Net asset value, ending balance |  | 25.20 |  | 45.75 |  | 25.20 |  | 45.75 |
Market value per share, beginning balance | [3] | 27.43 |  | 52.53 |  | 42.34 |  | 53.99 |
Market value per share, ending balance | [3] | $ 25.17 |  | $ 45.69 |  | $ 25.17 |  | $ 45.69 |
Total Return, at net asset value |  | (8.20%) | [4] | (12.00%) | [5] | (40.20%) | [4] | (15.20%) | [5]
Total Return, at market value |  | (8.20%) | [4] | (13.00%) | [5] | (40.60%) | [4] | (15.40%) | [5]
Ratios to Average Net Assets |  |  |  |  |  |  |  |  |
Expense ratio | [6] | 0.92% |  | 0.94% |  | 0.89% |  | 0.93% |
Expense ratio, excluding brokerage commissions | [6] | 0.85% |  | 0.85% |  | 0.85% |  | 0.85% |
Net investment income (loss) | [6] | (0.17%) |  | (0.70%) |  | (0.30%) |  | (0.71%) |
ProShares Short VIX Short-Term Futures ETF [Member] |  |  |  |  |  |  |  |  |
Investment Company, Financial Highlights [Line Items] |  |  |  |  |  |  |  |  |
Net asset value, beginning balance | [1] | $ 80.11 |  | $ 24.92 |  | $ 45.62 |  | $ 25.41 |
Net investment income (loss) | [1] | (0.13) |  | (0.09) |  | (0.45) |  | (0.21) |
Net realized and unrealized gain (loss) | [1],[2] | 13.70 |  | 11.49 |  | 48.51 |  | 11.12 |
Change in net asset value from operations | [1] | 13.57 |  | 11.40 |  | 48.06 |  | 10.91 |
Net asset value, ending balance | [1] | 93.68 |  | 36.32 |  | 93.68 |  | 36.32 |
Market value per share, beginning balance | [1],[3] | 80.64 |  | 24.53 |  | 45.49 |  | 25.23 |
Market value per share, ending balance | [1],[3] | $ 93.75 |  | $ 36.61 |  | $ 93.75 |  | $ 36.61 |
Total Return, at net asset value | [1] | 16.90% | [4] | 45.70% | [5] | 105.30% | [4] | 42.90% | [5]
Total Return, at market value | [1] | 16.30% | [4] | 49.20% | [5] | 106.10% | [4] | 45.10% | [5]
Ratios to Average Net Assets |  |  |  |  |  |  |  |  |
Expense ratio | [1],[6] | 1.50% |  | 1.42% |  | 1.52% |  | 1.36% |
Expense ratio, excluding brokerage commissions | [1],[6] | 0.95% |  | 0.95% |  | 0.95% |  | 0.95% |
Net investment income (loss) | [1],[6] | (0.66%) |  | (1.17%) |  | (0.80%) |  | (1.13%) |
ProShares Ultra VIX Short-Term Futures ETF [Member] |  |  |  |  |  |  |  |  |
Investment Company, Financial Highlights [Line Items] |  |  |  |  |  |  |  |  |
Net asset value, beginning balance | [1] | $ 39.32 |  | $ 912.60 |  | $ 173.93 |  | $ 2,808.40 |
Net investment income (loss) | [1] | (0.09) |  | (1.64) |  | (0.43) |  | (9.40) |
Net realized and unrealized gain (loss) | [1],[2] | (18.59) |  | (572.92) |  | (152.86) |  | (2,460.96) |
Change in net asset value from operations | [1] | (18.68) |  | (574.56) |  | (153.29) |  | (2,470.36) |
Net asset value, ending balance | [1] | 20.64 |  | 338.04 |  | 20.64 |  | 338.04 |
Market value per share, beginning balance | [1],[3] | 38.96 |  | 943.00 |  | 175.00 |  | 2,835.00 |
Market value per share, ending balance | [1],[3] | $ 20.60 |  | $ 333.00 |  | $ 20.60 |  | $ 333.00 |
Total Return, at net asset value | [1] | (47.50%) | [4] | (63.00%) | [5] | (88.10%) | [4] | (88.00%) | [5]
Total Return, at market value | [1] | (47.10%) | [4] | (64.70%) | [5] | (88.20%) | [4] | (88.30%) | [5]
Ratios to Average Net Assets |  |  |  |  |  |  |  |  |
Expense ratio | [1],[6] | 2.00% |  | 1.59% |  | 1.88% |  | 1.56% |
Expense ratio, excluding brokerage commissions | [1],[6] | 0.95% |  | 0.95% |  | 0.95% |  | 0.95% |
Net investment income (loss) | [1],[6] | (1.21%) |  | (1.36%) |  | (1.28%) |  | (1.33%) |
ProShares UltraShort Bloomberg Crude Oil [Member] |  |  |  |  |  |  |  |  |
Investment Company, Financial Highlights [Line Items] |  |  |  |  |  |  |  |  |
Net asset value, beginning balance |  | $ 43.43 |  | $ 40.97 | [1] | $ 31.70 |  | $ 66.60 | [1]
Net investment income (loss) |  | 0.00 | [7] | (0.09) | [1] | (0.08) |  | (0.31) | [1]
Net realized and unrealized gain (loss) | [2] | (9.83) |  | (0.88) | [1] | 1.98 |  | (26.29) | [1]
Change in net asset value from operations |  | (9.83) |  | (0.97) | [1] | 1.90 |  | (26.60) | [1]
Net asset value, ending balance |  | 33.60 |  | 40.00 | [1] | 33.60 |  | 40.00 | [1]
Market value per share, beginning balance | [3] | 43.21 |  | 40.81 | [1] | 31.65 |  | 66.82 | [1]
Market value per share, ending balance | [3] | $ 33.73 |  | $ 40.45 | [1] | $ 33.73 |  | $ 40.45 | [1]
Total Return, at net asset value |  | (22.60%) | [4] | (2.40%) | [1],[5] | 6.00% | [4] | (39.90%) | [1],[5]
Total Return, at market value |  | (21.90%) | [4] | (0.90%) | [1],[5] | 6.60% | [4] | (39.50%) | [1],[5]
Ratios to Average Net Assets |  |  |  |  |  |  |  |  |
Expense ratio | [6] | 0.99% |  | 1.01% | [1] | 0.99% |  | 1.04% | [1]
Expense ratio, excluding brokerage commissions | [6] | 0.95% |  | 0.95% | [1] | 0.95% |  | 0.95% | [1]
Net investment income (loss) | [6] | (0.03%) |  | (0.75%) | [1] | (0.29%) |  | (0.79%) | [1]
Pro Shares UltraPro 3X Short Crude Oil ETF [Member] |  |  |  |  |  |  |  |  |
Investment Company, Financial Highlights [Line Items] |  |  |  |  |  |  |  |  |
Net asset value, beginning balance |  | $ 26.46 |  |  |  | $ 25.00 | [8] |  |
Net investment income (loss) |  | (0.07) |  |  |  | (0.16) | [8] |  |
Net realized and unrealized gain (loss) | [2] | (8.87) |  |  |  | (7.32) | [8] |  |
Change in net asset value from operations |  | (8.94) |  |  |  | (7.48) | [8] |  |
Net asset value, ending balance | [8],[9] | 17.52 |  |  |  | 17.52 |  |  |
Market value per share, beginning balance | [3] | 26.24 |  |  |  | 25.00 | [8] |  |
Market value per share, ending balance | [3],[8],[9] | $ 17.63 |  |  |  | $ 17.63 |  |  |
Total Return, at net asset value | [4] | (33.80%) |  |  |  | (29.90%) | [8] |  |
Total Return, at market value | [4] | (32.80%) |  |  |  | (29.50%) | [8] |  |
Ratios to Average Net Assets |  |  |  |  |  |  |  |  |
Expense ratio | [6] | 1.31% |  |  |  | 1.34% | [8] |  |
Expense ratio, excluding brokerage commissions | [6] | 0.95% |  |  |  | 0.95% | [8] |  |
Net investment income (loss) | [6] | (1.31%) |  |  |  | (1.34%) | [8] |  |
ProShares UltraShort Yen [Member] |  |  |  |  |  |  |  |  |
Investment Company, Financial Highlights [Line Items] |  |  |  |  |  |  |  |  |
Net asset value, beginning balance |  | $ 74.07 |  | $ 63.53 |  | $ 80.24 |  | $ 87.94 |
Net investment income (loss) |  | 0.01 |  | (0.11) |  | (0.14) |  | (0.38) |
Net realized and unrealized gain (loss) | [2] | 0.18 |  | (2.74) |  | (5.84) |  | (26.88) |
Change in net asset value from operations |  | 0.19 |  | (2.85) |  | (5.98) |  | (27.26) |
Net asset value, ending balance |  | 74.26 |  | 60.68 |  | 74.26 |  | 60.68 |
Market value per share, beginning balance | [3] | 74.05 |  | 63.53 |  | 80.25 |  | 87.89 |
Market value per share, ending balance | [3] | $ 74.21 |  | $ 60.64 |  | $ 74.21 |  | $ 60.64 |
Total Return, at net asset value |  | 0.30% | [4] | (4.50%) | [5] | (7.50%) | [4] | (31.00%) | [5]
Total Return, at market value |  | 0.20% | [4] | (4.50%) | [5] | (7.50%) | [4] | (31.00%) | [5]
Ratios to Average Net Assets |  |  |  |  |  |  |  |  |
Expense ratio | [6] | 0.95% |  | 0.95% |  | 0.95% |  | 0.95% |
Expense ratio, excluding brokerage commissions | [6] | 0.95% |  | 0.95% |  | 0.95% |  | 0.95% |
Net investment income (loss) | [6] | 0.03% |  | (0.69%) |  | (0.26%) |  | (0.74%) |
ProShares Ultra Bloomberg Crude Oil [Member] |  |  |  |  |  |  |  |  |
Investment Company, Financial Highlights [Line Items] |  |  |  |  |  |  |  |  |
Net asset value, beginning balance |  | $ 14.80 |  | $ 24.33 | [1] | $ 23.34 |  | $ 25.15 | [1]
Net investment income (loss) |  | 0.00 | [10] | (0.04) | [1] | (0.03) |  | (0.12) | [1]
Net realized and unrealized gain (loss) | [2] | 3.10 |  | (3.27) | [1] | (5.41) |  | (4.01) | [1]
Change in net asset value from operations |  | 3.10 |  | (3.31) | [1] | (5.44) |  | (4.13) | [1]
Net asset value, ending balance |  | 17.90 |  | 21.02 | [1] | 17.90 |  | 21.02 | [1]
Market value per share, beginning balance | [3] | 14.86 |  | 24.44 | [1] | 23.36 |  | 25.08 | [1]
Market value per share, ending balance | [3] | $ 17.82 |  | $ 20.76 | [1] | $ 17.82 |  | $ 20.76 | [1]
Total Return, at net asset value |  | 20.90% | [4] | (13.60%) | [1],[5] | (23.30%) | [4] | (16.40%) | [1],[5]
Total Return, at market value |  | 19.90% | [4] | (15.10%) | [1],[5] | (23.70%) | [4] | (17.20%) | [1],[5]
Ratios to Average Net Assets |  |  |  |  |  |  |  |  |
Expense ratio | [6] | 0.97% |  | 1.00% | [1] | 0.97% |  | 1.02% | [1]
Expense ratio, excluding brokerage commissions | [6] | 0.95% |  | 0.95% | [1] | 0.95% |  | 0.95% | [1]
Net investment income (loss) | [6] | (0.01%) |  | (0.75%) | [1] | (0.24%) |  | (0.78%) | [1]
Proshares Ultra Pro 3X Crude Oil ETF [Member] |  |  |  |  |  |  |  |  |
Investment Company, Financial Highlights [Line Items] |  |  |  |  |  |  |  |  |
Net asset value, beginning balance |  | $ 19.52 |  |  |  | $ 25.00 |  |  |
Net investment income (loss) |  | (0.07) |  |  |  | (0.14) |  |  |
Net realized and unrealized gain (loss) | [2] | 5.82 |  |  |  | 0.41 |  |  |
Change in net asset value from operations |  | 5.75 |  |  |  | 0.27 |  |  |
Net asset value, ending balance |  | 25.27 |  |  |  | 25.27 |  |  |
Market value per share, beginning balance | [3] | 19.68 |  |  |  | 25.00 |  |  |
Market value per share, ending balance | [3] | $ 25.09 |  |  |  | $ 25.09 |  |  |
Total Return, at net asset value | [4] | 29.50% |  |  |  | 1.10% |  |  |
Total Return, at market value | [4] | 27.50% |  |  |  | 0.40% |  |  |
Ratios to Average Net Assets |  |  |  |  |  |  |  |  |
Expense ratio | [6] | 1.24% |  |  |  | 1.26% |  |  |
Expense ratio, excluding brokerage commissions | [6] | 0.95% |  |  |  | 0.95% |  |  |
Net investment income (loss) | [6] | (1.24%) |  |  |  | (1.26%) |  |  |
ProShares Ultra Bloomberg Natural Gas [Member] |  |  |  |  |  |  |  |  |
Investment Company, Financial Highlights [Line Items] |  |  |  |  |  |  |  |  |
Net asset value, beginning balance |  | $ 9.77 |  | $ 17.75 |  | $ 18.85 |  | $ 18.57 |
Net investment income (loss) |  | (0.01) |  | (0.04) |  | (0.05) |  | (0.12) |
Net realized and unrealized gain (loss) | [2] | (1.02) |  | (3.23) |  | (10.06) |  | (3.97) |
Change in net asset value from operations |  | (1.03) |  | (3.27) |  | (10.11) |  | (4.09) |
Net asset value, ending balance |  | 8.74 |  | 14.48 |  | 8.74 |  | 14.48 |
Market value per share, beginning balance | [3] | 9.74 |  | 17.65 |  | 18.96 |  | 18.48 |
Market value per share, ending balance | [3] | $ 8.80 |  | $ 14.58 |  | $ 8.80 |  | $ 14.58 |
Total Return, at net asset value |  | (10.50%) | [4] | (18.40%) | [5] | (53.60%) | [4] | (22.00%) | [5]
Total Return, at market value |  | (9.70%) | [4] | (17.40%) | [5] | (53.60%) | [4] | (21.10%) | [5]
Ratios to Average Net Assets |  |  |  |  |  |  |  |  |
Expense ratio | [6] | 1.16% |  | 1.23% |  | 1.16% |  | 1.36% |
Expense ratio, excluding brokerage commissions | [6] | 0.95% |  | 0.95% |  | 0.95% |  | 0.95% |
Net investment income (loss) | [6] | (0.37%) |  | (1.03%) |  | (0.57%) |  | (1.17%) |
ProShares Ultra Gold [Member] |  |  |  |  |  |  |  |  |
Investment Company, Financial Highlights [Line Items] |  |  |  |  |  |  |  |  |
Net asset value, beginning balance |  | $ 37.75 |  | $ 44.80 |  | $ 32.90 |  | $ 29.73 |
Net investment income (loss) |  | 0.00 | [7] | (0.08) |  | (0.06) |  | (0.21) |
Net realized and unrealized gain (loss) | [2] | 2.07 |  | (0.30) |  | 6.98 |  | 14.90 |
Change in net asset value from operations |  | 2.07 |  | (0.38) |  | 6.92 |  | 14.69 |
Net asset value, ending balance |  | 39.82 |  | 44.42 |  | 39.82 |  | 44.42 |
Market value per share, beginning balance | [3] | 37.68 |  | 45.03 |  | 33.20 |  | 29.73 |
Market value per share, ending balance | [3] | $ 39.60 |  | $ 44.01 |  | $ 39.60 |  | $ 44.01 |
Total Return, at net asset value |  | 5.50% | [4] | (0.80%) | [5] | 21.00% | [4] | 49.40% | [5]
Total Return, at market value |  | 5.10% | [4] | (2.30%) | [5] | 19.30% | [4] | 48.00% | [5]
Ratios to Average Net Assets |  |  |  |  |  |  |  |  |
Expense ratio | [6] | 0.95% |  | 0.95% |  | 0.95% |  | 0.95% |
Expense ratio, excluding brokerage commissions | [6] | 0.95% |  | 0.95% |  | 0.95% |  | 0.95% |
Net investment income (loss) | [6] | 0.03% |  | (0.67%) |  | (0.22%) |  | (0.69%) |
ProShares Ultra Silver [Member] |  |  |  |  |  |  |  |  |
Investment Company, Financial Highlights [Line Items] |  |  |  |  |  |  |  |  |
Net asset value, beginning balance |  | $ 33.23 |  | $ 45.53 |  | $ 33.44 |  | $ 27.06 |
Net investment income (loss) |  | 0.00 | [7] | (0.09) |  | (0.06) |  | (0.21) |
Net realized and unrealized gain (loss) | [2] | 0.79 |  | 3.56 |  | 0.64 |  | 22.15 |
Change in net asset value from operations |  | 0.79 |  | 3.47 |  | 0.58 |  | 21.94 |
Net asset value, ending balance |  | 34.02 |  | 49.00 |  | 34.02 |  | 49.00 |
Market value per share, beginning balance | [3] | 33.82 |  | 47.67 |  | 32.09 |  | 27.08 |
Market value per share, ending balance | [3] | $ 33.15 |  | $ 48.11 |  | $ 33.15 |  | $ 48.11 |
Total Return, at net asset value |  | 2.40% | [4] | 7.60% | [5] | 1.70% | [4] | 81.10% | [5]
Total Return, at market value |  | (2.00%) | [4] | 0.90% | [5] | 3.30% | [4] | 77.70% | [5]
Ratios to Average Net Assets |  |  |  |  |  |  |  |  |
Expense ratio | [6] | 0.95% |  | 0.95% |  | 0.95% |  | 0.95% |
Expense ratio, excluding brokerage commissions | [6] | 0.95% |  | 0.95% |  | 0.95% |  | 0.95% |
Net investment income (loss) | [6] | 0.00% | [11] | (0.68%) |  | (0.23%) |  | (0.71%) |
ProShares Ultra Euro [Member] |  |  |  |  |  |  |  |  |
Investment Company, Financial Highlights [Line Items] |  |  |  |  |  |  |  |  |
Net asset value, beginning balance |  | $ 16.16 |  | $ 15.89 |  | $ 14.02 |  | $ 15.51 |
Net investment income (loss) |  | 0.00 | [10] | (0.03) |  | (0.03) |  | (0.08) |
Net realized and unrealized gain (loss) | [2] | 0.97 |  | 0.27 |  | 3.14 |  | 0.70 |
Change in net asset value from operations |  | 0.97 |  | 0.24 |  | 3.11 |  | 0.62 |
Net asset value, ending balance |  | 17.13 |  | 16.13 |  | 17.13 |  | 16.13 |
Market value per share, beginning balance | [3] | 16.17 |  | 15.86 |  | 14.09 |  | 15.51 |
Market value per share, ending balance | [3] | $ 17.10 |  | $ 16.12 |  | $ 17.10 |  | $ 16.12 |
Total Return, at net asset value |  | 6.00% | [4] | 1.50% | [5] | 22.20% | [4] | 4.00% | [5]
Total Return, at market value |  | 5.80% | [4] | 1.60% | [5] | 21.40% | [4] | 3.90% | [5]
Ratios to Average Net Assets |  |  |  |  |  |  |  |  |
Expense ratio | [6] | 0.95% |  | 0.95% |  | 0.95% |  | 0.95% |
Expense ratio, excluding brokerage commissions | [6] | 0.95% |  | 0.95% |  | 0.95% |  | 0.95% |
Net investment income (loss) | [6] | (0.04%) |  | (0.69%) |  | (0.26%) |  | (0.71%) |
ProShares Ultra Yen [Member] |  |  |  |  |  |  |  |  |
Investment Company, Financial Highlights [Line Items] |  |  |  |  |  |  |  |  |
Net asset value, beginning balance |  | $ 58.68 |  | $ 72.67 |  | $ 55.43 |  | $ 54.75 |
Net investment income (loss) |  | (0.04) |  | (0.13) |  | (0.21) |  | (0.36) |
Net realized and unrealized gain (loss) | [2] | (0.57) |  | 1.92 |  | 2.85 |  | 20.07 |
Change in net asset value from operations |  | (0.61) |  | 1.79 |  | 2.64 |  | 19.71 |
Net asset value, ending balance |  | 58.07 |  | 74.46 |  | 58.07 |  | 74.46 |
Market value per share, beginning balance | [3] | 58.68 |  | 72.71 |  | 55.52 |  | 54.70 |
Market value per share, ending balance | [3] | $ 58.17 |  | $ 74.48 |  | $ 58.17 |  | $ 74.48 |
Total Return, at net asset value |  | (1.00%) | [4] | 2.50% | [5] | 4.80% | [4] | 36.00% | [5]
Total Return, at market value |  | (0.90%) | [4] | 2.40% | [5] | 4.80% | [4] | 36.20% | [5]
Ratios to Average Net Assets |  |  |  |  |  |  |  |  |
Expense ratio | [6] | 0.95% |  | 0.95% |  | 0.95% |  | 0.95% |
Expense ratio, excluding brokerage commissions | [6] | 0.95% |  | 0.95% |  | 0.95% |  | 0.95% |
Net investment income (loss) | [6] | (0.28%) |  | (0.70%) |  | (0.47%) |  | (0.71%) |
ProShares UltraShort Bloomberg Natural Gas [Member] |  |  |  |  |  |  |  |  |
Investment Company, Financial Highlights [Line Items] |  |  |  |  |  |  |  |  |
Net asset value, beginning balance |  | $ 33.16 |  | $ 34.09 |  | $ 23.10 |  | $ 46.53 |
Net investment income (loss) |  | (0.06) |  | (0.13) |  | (0.20) |  | (0.57) |
Net realized and unrealized gain (loss) | [2] | 0.77 |  | 2.36 |  | 10.97 |  | (9.64) |
Change in net asset value from operations |  | 0.71 |  | 2.23 |  | 10.77 |  | (10.21) |
Net asset value, ending balance |  | 33.87 |  | 36.32 |  | 33.87 |  | 36.32 |
Market value per share, beginning balance | [3] | 33.33 |  | 34.06 |  | 23.05 |  | 46.55 |
Market value per share, ending balance | [3] | $ 33.64 |  | $ 36.14 |  | $ 33.64 |  | $ 36.14 |
Total Return, at net asset value |  | 2.10% | [4] | 6.50% | [5] | 46.60% | [4] | (22.00%) | [5]
Total Return, at market value |  | 0.90% | [4] | 6.10% | [5] | 45.90% | [4] | (22.40%) | [5]
Ratios to Average Net Assets |  |  |  |  |  |  |  |  |
Expense ratio | [6] | 1.34% |  | 1.58% |  | 1.32% |  | 1.68% |
Expense ratio, excluding brokerage commissions | [6] | 0.95% |  | 0.95% |  | 0.95% |  | 0.95% |
Net investment income (loss) | [6] | (0.73%) |  | (1.40%) |  | (0.83%) |  | (1.46%) |
ProShares UltraShort Gold [Member] |  |  |  |  |  |  |  |  |
Investment Company, Financial Highlights [Line Items] |  |  |  |  |  |  |  |  |
Net asset value, beginning balance |  | $ 76.30 |  | $ 70.31 |  | $ 91.33 |  | $ 115.88 |
Net investment income (loss) |  | 0.00 | [10] | (0.12) |  | (0.13) |  | (0.42) |
Net realized and unrealized gain (loss) | [2] | (5.02) |  | (0.58) |  | (19.92) |  | (45.85) |
Change in net asset value from operations |  | (5.02) |  | (0.70) |  | (20.05) |  | (46.27) |
Net asset value, ending balance |  | 71.28 |  | 69.61 |  | 71.28 |  | 69.61 |
Market value per share, beginning balance | [3] | 76.37 |  | 70.00 |  | 90.54 |  | 115.83 |
Market value per share, ending balance | [3] | $ 71.55 |  | $ 70.19 |  | $ 71.55 |  | $ 70.19 |
Total Return, at net asset value |  | (6.60%) | [4] | (1.00%) | [5] | (22.00%) | [4] | (39.90%) | [5]
Total Return, at market value |  | (6.30%) | [4] | 0.30% | [5] | (21.00%) | [4] | (39.40%) | [5]
Ratios to Average Net Assets |  |  |  |  |  |  |  |  |
Expense ratio | [6] | 0.95% |  | 0.95% |  | 0.95% |  | 0.95% |
Expense ratio, excluding brokerage commissions | [6] | 0.95% |  | 0.95% |  | 0.95% |  | 0.95% |
Net investment income (loss) | [6] | (0.01%) |  | (0.69%) |  | (0.23%) |  | (0.71%) |
ProShares UltraShort Silver [Member] |  |  |  |  |  |  |  |  |
Investment Company, Financial Highlights [Line Items] |  |  |  |  |  |  |  |  |
Net asset value, beginning balance |  | $ 34.75 |  | $ 33.16 |  | $ 37.31 |  | $ 64.58 |
Net investment income (loss) |  | 0.00 | [10] | (0.05) |  | (0.06) |  | (0.21) |
Net realized and unrealized gain (loss) | [2] | (2.76) |  | (5.17) |  | (5.26) |  | (36.43) |
Change in net asset value from operations |  | (2.76) |  | (5.22) |  | (5.32) |  | (36.64) |
Net asset value, ending balance |  | 31.99 |  | 27.94 |  | 31.99 |  | 27.94 |
Market value per share, beginning balance | [3] | 34.09 |  | 31.65 |  | 38.76 |  | 64.55 |
Market value per share, ending balance | [3] | $ 32.78 |  | $ 28.41 |  | $ 32.78 |  | $ 28.41 |
Total Return, at net asset value |  | (7.90%) | [4] | (15.80%) | [5] | (14.30%) | [4] | (56.70%) | [5]
Total Return, at market value |  | (3.80%) | [4] | (10.20%) | [5] | (15.40%) | [4] | (56.00%) | [5]
Ratios to Average Net Assets |  |  |  |  |  |  |  |  |
Expense ratio | [6] | 0.95% |  | 0.95% |  | 0.95% |  | 0.95% |
Expense ratio, excluding brokerage commissions | [6] | 0.95% |  | 0.95% |  | 0.95% |  | 0.95% |
Net investment income (loss) | [6] | (0.05%) |  | (0.70%) |  | (0.27%) |  | (0.71%) |
ProShares Short Euro [Member] |  |  |  |  |  |  |  |  |
Investment Company, Financial Highlights [Line Items] |  |  |  |  |  |  |  |  |
Net asset value, beginning balance |  | $ 41.74 |  | $ 42.81 |  | $ 45.06 |  | $ 43.78 |
Net investment income (loss) |  | (0.01) |  | (0.08) |  | (0.12) |  | (0.25) |
Net realized and unrealized gain (loss) | [2] | (1.26) |  | (0.51) |  | (4.47) |  | (1.31) |
Change in net asset value from operations |  | (1.27) |  | (0.59) |  | (4.59) |  | (1.56) |
Net asset value, ending balance |  | 40.47 |  | 42.22 |  | 40.47 |  | 42.22 |
Market value per share, beginning balance | [3] | 41.71 |  | 42.81 |  | 45.12 |  | 43.74 |
Market value per share, ending balance | [3] | $ 40.56 |  | $ 42.22 |  | $ 40.56 |  | $ 42.22 |
Total Return, at net asset value |  | (3.00%) | [4] | (1.40%) | [5] | (10.20%) | [4] | (3.60%) | [5]
Total Return, at market value |  | (2.80%) | [4] | (1.40%) | [5] | (10.10%) | [4] | (3.50%) | [5]
Ratios to Average Net Assets |  |  |  |  |  |  |  |  |
Expense ratio | [6] | 0.96% |  | 0.96% |  | 0.96% |  | 0.97% |
Expense ratio, excluding brokerage commissions | [6] | 0.95% |  | 0.95% |  | 0.95% |  | 0.95% |
Net investment income (loss) | [6] | (0.14%) |  | (0.75%) |  | (0.37%) |  | (0.78%) |
ProShares UltraShort Australian Dollar [Member] |  |  |  |  |  |  |  |  |
Investment Company, Financial Highlights [Line Items] |  |  |  |  |  |  |  |  |
Net asset value, beginning balance |  | $ 47.90 |  | $ 53.47 |  | $ 55.38 |  | $ 58.46 |
Net investment income (loss) |  | (0.01) |  | (0.10) |  | (0.15) |  | (0.33) |
Net realized and unrealized gain (loss) | [2] | (2.26) |  | (3.69) |  | (9.60) |  | (8.45) |
Change in net asset value from operations |  | (2.27) |  | (3.79) |  | (9.75) |  | (8.78) |
Net asset value, ending balance |  | 45.63 |  | 49.68 |  | 45.63 |  | 49.68 |
Market value per share, beginning balance | [3] | 47.80 |  | 53.47 |  | 55.24 |  | 58.15 |
Market value per share, ending balance | [3] | $ 45.85 |  | $ 49.67 |  | $ 45.85 |  | $ 49.67 |
Total Return, at net asset value |  | (4.70%) | [4] | (7.10%) | [5] | (17.60%) | [4] | (15.00%) | [5]
Total Return, at market value |  | (4.10%) | [4] | (7.10%) | [5] | (17.00%) | [4] | (14.60%) | [5]
Ratios to Average Net Assets |  |  |  |  |  |  |  |  |
Expense ratio | [6] | 1.01% |  | 1.02% |  | 1.01% |  | 1.03% |
Expense ratio, excluding brokerage commissions | [6] | 0.95% |  | 0.95% |  | 0.95% |  | 0.95% |
Net investment income (loss) | [6] | (0.13%) |  | (0.75%) |  | (0.42%) |  | (0.80%) |
ProShares UltraShort Euro [Member] |  |  |  |  |  |  |  |  |
Investment Company, Financial Highlights [Line Items] |  |  |  |  |  |  |  |  |
Net asset value, beginning balance |  | $ 23.12 |  | $ 24.32 |  | $ 27.08 |  | $ 25.54 |
Net investment income (loss) |  | 0.00 | [7] | (0.04) |  | (0.04) |  | (0.13) |
Net realized and unrealized gain (loss) | [2] | (1.43) |  | (0.50) |  | (5.35) |  | (1.63) |
Change in net asset value from operations |  | (1.43) |  | (0.54) |  | (5.39) |  | (1.76) |
Net asset value, ending balance |  | 21.69 |  | 23.78 |  | 21.69 |  | 23.78 |
Market value per share, beginning balance | [3] | 23.12 |  | 24.32 |  | 27.08 |  | 25.53 |
Market value per share, ending balance | [3] | $ 21.68 |  | $ 23.76 |  | $ 21.68 |  | $ 23.76 |
Total Return, at net asset value |  | (6.20%) | [4] | (2.20%) | [5] | (19.90%) | [4] | (6.90%) | [5]
Total Return, at market value |  | (6.20%) | [4] | (2.30%) | [5] | (19.90%) | [4] | (6.90%) | [5]
Ratios to Average Net Assets |  |  |  |  |  |  |  |  |
Expense ratio | [6] | 0.95% |  | 0.95% |  | 0.95% |  | 0.95% |
Expense ratio, excluding brokerage commissions | [6] | 0.95% |  | 0.95% |  | 0.95% |  | 0.95% |
Net investment income (loss) | [6] | 0.04% |  | (0.69%) |  | (0.23%) |  | (0.70%) |
[1] | See Note 1 of these Notes to Financial Statements.
[2] | The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period.
[3] | Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds' net asset value is calculated.
[4] | Percentages are not annualized for the period ended September 30, 2017.
[5] | Percentages are not annualized for the period ended September 30, 2016.
[6] | Percentages are annualized.
[7] | Amount represents less than $0.005.
[8] | From commencement of operations, March 24, 2017 through September 30, 2017.
[9] | Since the Fund's inception date was January 13, 2017, the Statement of Financial Condition as of December 31, 2016 has not been provided. See Note 1.
[10] | Amount represents less than $(0.005).
[11] | Amount represents less than 0.005%.

X
- Definition Expense ratio to average net assets. + References No definition available. + Details
Name: | ck0001415311_ExpenseRatioToAverageNetAssets
Namespace Prefix: | ck0001415311_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Expense ratio to average net assets, excluding brokerage commissions. + References No definition available. + Details
Name: | ck0001415311_ExpenseRatioToAverageNetAssetsExcludingBrokerageCommissions
Namespace Prefix: | ck0001415311_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Market value per share. + References No definition available. + Details
Name: | ck0001415311_MarketValuePerShare
Namespace Prefix: | ck0001415311_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Total return, at market value, per share. + References No definition available. + Details
Name: | ck0001415311_ReturnAtMarketValuePerShare
Namespace Prefix: | ck0001415311_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total return, at net asset value, per share. + References No definition available. + Details
Name: | ck0001415311_ReturnAtNetAssetValuePerShare
Namespace Prefix: | ck0001415311_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_InvestmentCompanyFinancialHighlightsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InvestmentCompanyFinancialRatiosAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Per share or unit amount of realized and unrealized gain (loss) on investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 205 -Section 50 -Paragraph 7 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25866437&loc=d3e10246-115837 + Details
Name: | us-gaap_InvestmentCompanyGainLossOnInvestmentPerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Per share or unit amount of investment income (loss) and realized and unrealized gain (loss) on investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 205 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=25866437&loc=d3e10246-115837 + Details
Name: | us-gaap_InvestmentCompanyInvestmentIncomeLossFromOperationsPerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Per share or unit amount, after investment expense, of dividend and interest investment income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 205 -Section 50 -Paragraph 7 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25866437&loc=d3e10246-115837 + Details
Name: | us-gaap_InvestmentCompanyInvestmentIncomeLossPerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of investment income (loss) to average net assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 205 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=25866437&loc=d3e10328-115837 + Details
Name: | us-gaap_InvestmentCompanyInvestmentIncomeLossRatio
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Net asset value per share or per unit of investments in certain entities that calculate net asset value per share. Includes, but is not limited to, by unit, membership interest, or other ownership interest. Investment includes, but is not limited to, investment in certain hedge funds, venture capital funds, private equity funds, real estate partnerships or funds. Excludes fair value disclosure. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 35 -Paragraph 54B -URI http://asc.fasb.org/extlink&oid=65894324&loc=SL7495116-110257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -URI http://asc.fasb.org/extlink&oid=66048111&loc=SL6742756-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 35 -Paragraph 59 -URI http://asc.fasb.org/extlink&oid=65894324&loc=SL6740821-110257 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 205 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25866437&loc=d3e10246-115837 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 205 -Section 50 -Paragraph 7 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=25866437&loc=d3e10246-115837 + Details
Name: | us-gaap_NetAssetValuePerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesVixShortTermFuturesEtfMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesVixMidTermFuturesEtfMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesUltraShortBloombergCrudeOilMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesUltraProThreeXShortCrudeOilEtfMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesUltraShortYenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesUltraBloombergCrudeOilMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesUltraProThreexCrudeOilEtfMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesUltraBloombergNaturalGasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesUltraGoldMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesUltraSilverMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesUltraEuroMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesUltraYenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesUltraShortBloombergNaturalGasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesUltraShortGoldMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesUltraShortSilverMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesShortEuroMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesUltraShortAustralianDollarMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesUltraShortEuroMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |