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Statements of Financial Condition (Parenthetical) (USD $)
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Mar. 31, 2014
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Dec. 31, 2013
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ProShares UltraShort DJ-UBS Commodity [Member]
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| Short-term U.S. government and agency obligations, cost | $ 2,486,639 | $ 3,453,851 |
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ProShares UltraShort DJ-UBS Crude Oil [Member]
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| Short-term U.S. government and agency obligations, cost | 288,249,529 | 247,573,678 |
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ProShares UltraShort DJ-UBS Natural Gas [Member]
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| Short-term U.S. government and agency obligations, cost | 56,750,896 | 18,274,602 |
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ProShares UltraShort Gold [Member]
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| Short-term U.S. government and agency obligations, cost | 105,836,793 | 148,987,995 |
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ProShares UltraShort Silver [Member]
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| Short-term U.S. government and agency obligations, cost | 67,185,974 | 114,822,672 |
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ProShares Short Euro [Member]
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| Short-term U.S. government and agency obligations, cost | 6,226,796 | 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 | 19,226,421 | 24,197,046 |
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ProShares UltraShort Euro [Member]
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| Short-term U.S. government and agency obligations, cost | 414,295,727 | 437,821,545 |
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ProShares UltraShort Yen [Member]
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| Short-term U.S. government and agency obligations, cost | 400,704,523 | 558,563,134 |
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ProShares Ultra DJ-UBS Commodity [Member]
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| Short-term U.S. government and agency obligations, cost | 2,410,744 | 2,816,627 |
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ProShares Ultra DJ-UBS Crude Oil [Member]
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| Short-term U.S. government and agency obligations, cost | 112,050,123 | 137,423,179 |
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ProShares Ultra DJ-UBS Natural Gas [Member]
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| Short-term U.S. government and agency obligations, cost | 18,277,464 | 58,918,095 |
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ProShares Ultra Gold [Member]
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| Short-term U.S. government and agency obligations, cost | 148,333,041 | 140,884,104 |
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ProShares Ultra Silver [Member]
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| Short-term U.S. government and agency obligations, cost | 530,685,172 | 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 | 2,775,556 | 2,716,026 |
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ProShares Ultra Euro [Member]
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| Short-term U.S. government and agency obligations, cost | 2,307,628 | 2,455,715 |
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ProShares Ultra Yen [Member]
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| Short-term U.S. government and agency obligations, cost | 2,471,639 | 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 | 94,147,330 | 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 | 48,694,338 | 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 | 173,848,340 | 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 | 169,484,257 | 105,554,675 |
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ProShares Trust II [Member]
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| Short-term U.S. government and agency obligations, cost | $ 2,666,448,930 | $ 2,846,340,077 |