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Statements of Financial Condition (Parenthetical) (USD $)
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Jun. 30, 2014
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Dec. 31, 2013
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ProShares UltraShort Bloomberg Commodity [Member]
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| Short-term U.S. government and agency obligations, cost | $ 2,975,653 | $ 3,453,851 |
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ProShares UltraShort Bloomberg Crude Oil [Member]
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| Short-term U.S. government and agency obligations, cost | 364,432,294 | 247,573,678 |
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ProShares UltraShort Bloomberg Natural Gas [Member]
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| Short-term U.S. government and agency obligations, cost | 44,128,238 | 18,274,602 |
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ProShares UltraShort Gold [Member]
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| Short-term U.S. government and agency obligations, cost | 94,198,546 | 148,987,995 |
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ProShares UltraShort Silver [Member]
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| Short-term U.S. government and agency obligations, cost | 62,533,634 | 114,822,672 |
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ProShares Short Euro [Member]
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| Short-term U.S. government and agency obligations, cost | 12,789,830 | 7,901,405 |
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ProShares UltraShort Australian Dollar [Member]
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| Short-term U.S. government and agency obligations, cost | 17,768,447 | 24,197,046 |
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ProShares UltraShort Euro [Member]
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| Short-term U.S. government and agency obligations, cost | 445,858,348 | 437,821,545 |
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ProShares UltraShort Yen [Member]
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| Short-term U.S. government and agency obligations, cost | 363,182,251 | 558,563,134 |
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ProShares Ultra Bloomberg Commodity [Member]
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| Short-term U.S. government and agency obligations, cost | 3,166,718 | 2,816,627 |
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ProShares Ultra Bloomberg Crude Oil [Member]
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| Short-term U.S. government and agency obligations, cost | 92,958,183 | 137,423,179 |
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ProShares Ultra Bloomberg Natural Gas [Member]
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| Short-term U.S. government and agency obligations, cost | 15,519,408 | 58,918,095 |
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ProShares Ultra Gold [Member]
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| Short-term U.S. government and agency obligations, cost | 122,189,443 | 140,884,104 |
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ProShares Ultra Silver [Member]
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| Short-term U.S. government and agency obligations, cost | 424,513,295 | 467,849,038 |
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ProShares Ultra Australian Dollar [Member]
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| Short-term U.S. government and agency obligations, cost | 3,087,469 | 2,716,026 |
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ProShares Ultra Euro [Member]
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| Short-term U.S. government and agency obligations, cost | 2,486,757 | 2,455,715 |
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ProShares Ultra Yen [Member]
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| Short-term U.S. government and agency obligations, cost | 1,479,851 | 2,928,242 |
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ProShares VIX Short-Term Futures ETF [Member]
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| Short-term U.S. government and agency obligations, cost | 77,583,175 | 207,628,319 |
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ProShares VIX Mid-Term Futures ETF [Member]
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| Short-term U.S. government and agency obligations, cost | 34,381,059 | 46,039,268 |
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ProShares Ultra VIX Short-Term Futures ETF [Member]
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| Short-term U.S. government and agency obligations, cost | 177,917,757 | 109,530,861 |
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ProShares Short VIX Short-Term Futures ETF [Member]
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| Short-term U.S. government and agency obligations, cost | 150,294,074 | 105,554,675 |
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ProShares Trust II [Member]
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| Short-term U.S. government and agency obligations, cost | $ 2,513,444,430 | $ 2,846,340,077 |