v2.4.0.8

Statements of Financial Condition (Parenthetical) (USD $) | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
ProShares UltraShort DJ-UBS Commodity [Member] |  |
Short-term U.S. government and agency obligations, cost | $ 2,486,639 | $ 3,453,851
ProShares UltraShort DJ-UBS Crude Oil [Member] |  |
Short-term U.S. government and agency obligations, cost | 288,249,529 | 247,573,678
ProShares UltraShort DJ-UBS Natural Gas [Member] |  |
Short-term U.S. government and agency obligations, cost | 56,750,896 | 18,274,602
ProShares UltraShort Gold [Member] |  |
Short-term U.S. government and agency obligations, cost | 105,836,793 | 148,987,995
ProShares UltraShort Silver [Member] |  |
Short-term U.S. government and agency obligations, cost | 67,185,974 | 114,822,672
ProShares Short Euro [Member] |  |
Short-term U.S. government and agency obligations, cost | 6,226,796 | 7,901,405
ProShares UltraShort Australian Dollar [Member] |  |
Short-term U.S. government and agency obligations, cost | 19,226,421 | 24,197,046
ProShares UltraShort Euro [Member] |  |
Short-term U.S. government and agency obligations, cost | 414,295,727 | 437,821,545
ProShares UltraShort Yen [Member] |  |
Short-term U.S. government and agency obligations, cost | 400,704,523 | 558,563,134
ProShares Ultra DJ-UBS Commodity [Member] |  |
Short-term U.S. government and agency obligations, cost | 2,410,744 | 2,816,627
ProShares Ultra DJ-UBS Crude Oil [Member] |  |
Short-term U.S. government and agency obligations, cost | 112,050,123 | 137,423,179
ProShares Ultra DJ-UBS Natural Gas [Member] |  |
Short-term U.S. government and agency obligations, cost | 18,277,464 | 58,918,095
ProShares Ultra Gold [Member] |  |
Short-term U.S. government and agency obligations, cost | 148,333,041 | 140,884,104
ProShares Ultra Silver [Member] |  |
Short-term U.S. government and agency obligations, cost | 530,685,172 | 467,849,038
ProShares Ultra Australian Dollar [Member] |  |
Short-term U.S. government and agency obligations, cost | 2,775,556 | 2,716,026
ProShares Ultra Euro [Member] |  |
Short-term U.S. government and agency obligations, cost | 2,307,628 | 2,455,715
ProShares Ultra Yen [Member] |  |
Short-term U.S. government and agency obligations, cost | 2,471,639 | 2,928,242
ProShares VIX Short-Term Futures ETF [Member] |  |
Short-term U.S. government and agency obligations, cost | 94,147,330 | 207,628,319
ProShares VIX Mid-Term Futures ETF [Member] |  |
Short-term U.S. government and agency obligations, cost | 48,694,338 | 46,039,268
ProShares Ultra VIX Short-Term Futures ETF [Member] |  |
Short-term U.S. government and agency obligations, cost | 173,848,340 | 109,530,861
ProShares Short VIX Short-Term Futures ETF [Member] |  |
Short-term U.S. government and agency obligations, cost | 169,484,257 | 105,554,675
ProShares Trust II [Member] |  |
Short-term U.S. government and agency obligations, cost | $ 2,666,448,930 | $ 2,846,340,077

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- Definition Short-term U.S. government and agency obligations, cost. + References No definition available. + Details
Name: | ck0001415311_ShortTermUSGovernmentAndAgencyObligationsCost
Namespace Prefix: | ck0001415311_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant