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STATEMENTS OF FINANCIAL CONDITION (Parenthetical) (USD $)
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Mar. 31, 2013
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Dec. 31, 2012
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|---|---|---|
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ProShares UltraShort DJ-UBS Commodity [Member]
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| Short-term U.S. government and agency obligations, cost | $ 3,062,693 | $ 2,803,598 |
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ProShares UltraShort DJ-UBS Crude Oil [Member]
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| Short-term U.S. government and agency obligations, cost | 145,470,481 | 87,042,320 |
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ProShares UltraShort DJ-UBS Natural Gas [Member]
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| Short-term U.S. government and agency obligations, cost | 21,192,907 | 10,042,198 |
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ProShares UltraShort Gold [Member]
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| Short-term U.S. government and agency obligations, cost | 108,154,807 | 88,573,928 |
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ProShares UltraShort Silver [Member]
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| Short-term U.S. government and agency obligations, cost | 105,343,764 | 86,199,868 |
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ProShares Short Euro [Member]
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| Short-term U.S. government and agency obligations, cost | 3,371,937 | 3,409,716 |
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ProShares UltraShort Australian Dollar [Member]
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| Short-term U.S. government and agency obligations, cost | 3,329,947 | 3,302,725 |
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ProShares UltraShort Euro [Member]
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| Short-term U.S. government and agency obligations, cost | 507,177,936 | 553,417,216 |
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ProShares UltraShort Yen [Member]
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| Short-term U.S. government and agency obligations, cost | 463,610,208 | 362,731,936 |
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ProShares Ultra DJ-UBS Commodity [Member]
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| Short-term U.S. government and agency obligations, cost | 3,350,591 | 6,240,818 |
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ProShares Ultra DJ-UBS Crude Oil [Member]
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| Short-term U.S. government and agency obligations, cost | 303,993,548 | 437,644,628 |
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ProShares Ultra DJ-UBS Natural Gas [Member]
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| Short-term U.S. government and agency obligations, cost | 53,700,121 | 64,312,441 |
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ProShares Ultra Gold [Member]
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| Short-term U.S. government and agency obligations, cost | 307,376,479 | 350,608,755 |
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ProShares Ultra Silver [Member]
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| Short-term U.S. government and agency obligations, cost | 754,938,086 | 891,006,493 |
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ProShares Ultra Australian Dollar [Member]
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| Short-term U.S. government and agency obligations, cost | 3,676,855 | 3,570,687 |
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ProShares Ultra Euro [Member]
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| Short-term U.S. government and agency obligations, cost | 4,478,870 | 4,546,872 |
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ProShares Ultra Yen [Member]
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| Short-term U.S. government and agency obligations, cost | 3,534,876 | 4,587,701 |
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ProShares VIX Short-Term Futures ETF [Member]
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| Short-term U.S. government and agency obligations, cost | 152,933,255 | 144,057,296 |
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ProShares VIX Mid-Term Futures ETF [Member]
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| Short-term U.S. government and agency obligations, cost | 49,700,662 | 79,927,870 |
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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 | 118,784,627 | 97,445,279 |
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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 | 45,829,953 | 53,683,800 |
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ProShares Trust II [Member]
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| Short-term U.S. government and agency obligations, cost | $ 3,163,012,603 | $ 3,335,156,145 |