v2.4.1.9

Schedule of Investments - Futures Contracts Sold (Detail) (USD $) | Mar. 31, 2015
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ProShares Managed Futures Strategy [Member] | Futures Contracts Sold [Member] |  |
Schedule of Investments [Line Items] |  |
Unrealized Appreciation (Depreciation) | $ 128,417 us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
ProShares Managed Futures Strategy [Member] | Coffee 'C' Futures - ICE, Expires May 2015 [Member] | Futures Contracts Sold [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 2 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_CoffeeCFuturesIceExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Notional Amount at Value | 99,675 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_CoffeeCFuturesIceExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Unrealized Appreciation (Depreciation) | 26,006 us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_CoffeeCFuturesIceExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
ProShares Managed Futures Strategy [Member] | Copper Futures - COMEX, Expires May 2015 [Member] | Futures Contracts Sold [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 4 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_CopperFuturesComexExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Notional Amount at Value | 274,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_CopperFuturesComexExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Unrealized Appreciation (Depreciation) | (16,262)us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_CopperFuturesComexExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
ProShares Managed Futures Strategy [Member] | Copper Mini Futures - COMEX, Expires May 2015 [Member] | Futures Contracts Sold [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 1 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_CopperMiniFuturesComexExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Notional Amount at Value | 34,250 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_CopperMiniFuturesComexExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Unrealized Appreciation (Depreciation) | 775 us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_CopperMiniFuturesComexExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
ProShares Managed Futures Strategy [Member] | Corn Futures - CBT, Expires May 2015 [Member] | Futures Contracts Sold [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 10 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_CornFuturesCbtExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Notional Amount at Value | 188,125 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_CornFuturesCbtExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Unrealized Appreciation (Depreciation) | 8,675 us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_CornFuturesCbtExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
ProShares Managed Futures Strategy [Member] | Natural Gas Futures - NYMEX, Expires May 2015 [Member] | Futures Contracts Sold [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 6 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_NaturalGasFuturesNymexExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Notional Amount at Value | 158,400 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_NaturalGasFuturesNymexExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Unrealized Appreciation (Depreciation) | 9,950 us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_NaturalGasFuturesNymexExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
ProShares Managed Futures Strategy [Member] | Natural Gas Mini Futures - NYMEX, Expires May 2015 [Member] | Futures Contracts Sold [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 2 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_NaturalGasMiniFuturesNymexExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Notional Amount at Value | 13,200 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_NaturalGasMiniFuturesNymexExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Unrealized Appreciation (Depreciation) | 1,200 us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_NaturalGasMiniFuturesNymexExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
ProShares Managed Futures Strategy [Member] | NY Harbor ULSD Futures-NYMEX, May 2015 [Member] | Futures Contracts Sold [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 2 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_NyHarborUlsdFuturesNymexMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Notional Amount at Value | 143,472 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_NyHarborUlsdFuturesNymexMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Unrealized Appreciation (Depreciation) | 14,330 us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_NyHarborUlsdFuturesNymexMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
ProShares Managed Futures Strategy [Member] | RBOB Gasoline Futures - NYMEX, Expires May 2015 [Member] | Futures Contracts Sold [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 2 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_RbobGasolineFuturesNymexExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Notional Amount at Value | 148,680 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_RbobGasolineFuturesNymexExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Unrealized Appreciation (Depreciation) | 7,543 us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_RbobGasolineFuturesNymexExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
ProShares Managed Futures Strategy [Member] | Silver Mini Futures - ICE, Expires May 2015 [Member] | Futures Contracts Sold [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 8 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_SilverMiniFuturesIceExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Notional Amount at Value | 132,784 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_SilverMiniFuturesIceExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Unrealized Appreciation (Depreciation) | 4,544 us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_SilverMiniFuturesIceExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
ProShares Managed Futures Strategy [Member] | Sugar #11 Futures - CBT, Expires May 2015 [Member] | Futures Contracts Sold [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 13 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_SugarElevenFuturesCbtExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Notional Amount at Value | 173,701 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_SugarElevenFuturesCbtExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Unrealized Appreciation (Depreciation) | 34,600 us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_SugarElevenFuturesCbtExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
ProShares Managed Futures Strategy [Member] | Wheat Futures - CBT, Expires May 2015 [Member] | Futures Contracts Sold [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 9 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_WheatFuturesCbtExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Notional Amount at Value | 230,288 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_WheatFuturesCbtExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Unrealized Appreciation (Depreciation) | 6,700 us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_WheatFuturesCbtExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
ProShares Managed Futures Strategy [Member] | WTI Crude Oil Futures - NYMEX, Expires May 2015 [Member] | Futures Contracts Sold [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 2 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_WtiCrudeOilFuturesNymexExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Notional Amount at Value | 95,200 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_WtiCrudeOilFuturesNymexExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Unrealized Appreciation (Depreciation) | 11,260 us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_WtiCrudeOilFuturesNymexExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
ProShares Managed Futures Strategy [Member] | Australian Dollar Fx Currency Futures - CME, Expires June 2015 [Member] | Futures Contracts Sold [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 5 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_AustralianDollarFxCurrencyFuturesCmeExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Notional Amount at Value | 379,050 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_AustralianDollarFxCurrencyFuturesCmeExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Unrealized Appreciation (Depreciation) | 9,500 us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_AustralianDollarFxCurrencyFuturesCmeExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
ProShares Managed Futures Strategy [Member] | British Pound Fx Currency Futures - CME, Expires June 2015 [Member] | Futures Contracts Sold [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 7 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_BritishPoundFxCurrencyFuturesCmeExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Notional Amount at Value | 649,119 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_BritishPoundFxCurrencyFuturesCmeExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Unrealized Appreciation (Depreciation) | 15,419 us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_BritishPoundFxCurrencyFuturesCmeExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
ProShares Managed Futures Strategy [Member] | Canadian Dollar Fx Currency Futures - CME, Expires June 2015 [Member] | Futures Contracts Sold [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 5 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_CanadianDollarFxCurrencyFuturesCmeExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Notional Amount at Value | 394,600 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_CanadianDollarFxCurrencyFuturesCmeExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Unrealized Appreciation (Depreciation) | 7,000 us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_CanadianDollarFxCurrencyFuturesCmeExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
ProShares Managed Futures Strategy [Member] | Gold Mini Futures - ICE, Expires June 2015 [Member] | Futures Contracts Sold [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 6 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_GoldMiniFuturesIceExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Notional Amount at Value | 228,239 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_GoldMiniFuturesIceExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Unrealized Appreciation (Depreciation) | 694 us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_GoldMiniFuturesIceExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
ProShares Managed Futures Strategy [Member] | Euro Fx Currency Mini Futures - CME, Expires June 2015 [Member] | Futures Contracts Sold [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 8 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_EuroFxCurrencyMiniFuturesCmeExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Notional Amount at Value | 537,700 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_EuroFxCurrencyMiniFuturesCmeExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Unrealized Appreciation (Depreciation) | 15,619 us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_EuroFxCurrencyMiniFuturesCmeExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
ProShares Managed Futures Strategy [Member] | Lean Hogs Futures - CME, Expires June 2015 [Member] | Futures Contracts Sold [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 8 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_LeanHogsFuturesCmeExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Notional Amount at Value | 242,560 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_LeanHogsFuturesCmeExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Unrealized Appreciation (Depreciation) | 15,910 us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_LeanHogsFuturesCmeExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
ProShares Managed Futures Strategy [Member] | Live Cattle Futures - CME, Expires June 2015 [Member] | Futures Contracts Sold [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 6 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_LiveCattleFuturesCmeExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Notional Amount at Value | 365,580 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_LiveCattleFuturesCmeExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Unrealized Appreciation (Depreciation) | (15,290)us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_LiveCattleFuturesCmeExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
ProShares Managed Futures Strategy [Member] | Japanese Yen Fx Currency Futures - CME, Expires June 2015 [Member] | Futures Contracts Sold [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 4 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_JapaneseYenFxCurrencyFuturesCmeExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Notional Amount at Value | 417,300 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_JapaneseYenFxCurrencyFuturesCmeExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Unrealized Appreciation (Depreciation) | 850 us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_JapaneseYenFxCurrencyFuturesCmeExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
ProShares Managed Futures Strategy [Member] | Swiss Franc Fx Currency Futures - CME, Expires June 2015 [Member] | Futures Contracts Sold [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 2 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_SwissFrancFxCurrencyFuturesCmeExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Notional Amount at Value | 257,875 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_SwissFrancFxCurrencyFuturesCmeExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Unrealized Appreciation (Depreciation) | (200)us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_SwissFrancFxCurrencyFuturesCmeExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
ProShares Managed Futures Strategy [Member] | US Treasury Long Bond Futures - CBT, Expires June 2015 [Member] | Futures Contracts Sold [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 6 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_UsTreasuryLongBondFuturesCbtExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Notional Amount at Value | 983,250 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_UsTreasuryLongBondFuturesCbtExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Unrealized Appreciation (Depreciation) | (30,406)us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_UsTreasuryLongBondFuturesCbtExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
ProShares Short VIX Short-Term Futures ETF [Member] | Futures Contracts Sold [Member] |  |
Schedule of Investments [Line Items] |  |
Unrealized Appreciation (Depreciation) | 6,991,984 us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember | [2]
ProShares Short VIX Short-Term Futures ETF [Member] | VIX Futures - CBOE, Expires April 2015 [Member] | Futures Contracts Sold [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 7,729 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_VixFuturesCboeExpiresAprilTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember | [2]
Notional Amount at Value | 125,789,475 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_VixFuturesCboeExpiresAprilTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember | [2]
Unrealized Appreciation (Depreciation) | 8,591,734 us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_VixFuturesCboeExpiresAprilTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember | [2]
ProShares Short VIX Short-Term Futures ETF [Member] | VIX Futures - CBOE, Expires May 2015 [Member] | Futures Contracts Sold [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 8,675 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_VixFuturesCboeExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember | [2]
Notional Amount at Value | 154,631,875 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_VixFuturesCboeExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember | [2]
Unrealized Appreciation (Depreciation) | (1,599,750)us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_VixFuturesCboeExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember | [2]
ProShares UltraShort Bloomberg Crude Oil [Member] |  |
Schedule of Investments [Line Items] |  |
Unrealized Appreciation (Depreciation) | 26,857,473 us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCrudeOilMember | [3]
ProShares UltraShort Bloomberg Crude Oil [Member] | Crude Oil - NYMEX, Expires May 2015 [Member] | Futures Contracts Sold [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 6,624 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_CrudeOilNymexExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCrudeOilMember | [4]
Notional Amount at Value | 315,302,400 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_CrudeOilNymexExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCrudeOilMember | [4]
Unrealized Appreciation (Depreciation) | 17,406,261 us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_CrudeOilNymexExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCrudeOilMember | [4]
ProShares UltraShort Bloomberg Natural Gas [Member] | Natural Gas-NYMEX, Expires May 2015 [Member] | Futures Contracts Sold [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 828 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_NaturalGasNymexExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergNaturalGasMember | [5]
Notional Amount at Value | 21,859,200 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_NaturalGasNymexExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergNaturalGasMember | [5]
Unrealized Appreciation (Depreciation) | 859,740 us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_NaturalGasNymexExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergNaturalGasMember | [5]
ProShares UltraShort Gold [Member] |  |
Schedule of Investments [Line Items] |  |
Unrealized Appreciation (Depreciation) | (1,582,081)us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortGoldMember | [3]
ProShares UltraShort Gold [Member] | Gold Futures-COMEX, Expires June 2015 [Member] | Futures Contracts Sold [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 2 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_GoldFuturesComexExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortGoldMember | [6]
Notional Amount at Value | 236,640 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_GoldFuturesComexExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortGoldMember | [6]
Unrealized Appreciation (Depreciation) | (6,040)us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_GoldFuturesComexExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortGoldMember | [6]
ProShares UltraShort Silver [Member] |  |
Schedule of Investments [Line Items] |  |
Unrealized Appreciation (Depreciation) | (3,736,183)us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember | [3]
ProShares UltraShort Silver [Member] | Silver Futures-COMEX, Expires May 2015 [Member] | Futures Contracts Sold [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 2 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_SilverFuturesComexExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember | [7]
Notional Amount at Value | 165,980 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_SilverFuturesComexExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember | [7]
Unrealized Appreciation (Depreciation) | 3,095 us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_SilverFuturesComexExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember | [7]
ProShares Short Euro [Member] | Euro Fx Currency Futures - CME, Expires June 2015 [Member] | Futures Contracts Sold [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 150 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_EuroFxCurrencyFuturesCmeExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortEuroMember | [8]
Notional Amount at Value | 20,163,750 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_EuroFxCurrencyFuturesCmeExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortEuroMember | [8]
Unrealized Appreciation (Depreciation) | 109,769 us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_EuroFxCurrencyFuturesCmeExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortEuroMember | [8]
ProShares UltraShort Australian Dollar [Member] | Australian Dollar Fx Currency Futures - CME, Expires June 2015 [Member] | Futures Contracts Sold [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 530 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_AustralianDollarFxCurrencyFuturesCmeExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortAustralianDollarMember | [9]
Notional Amount at Value | 40,179,300 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_AustralianDollarFxCurrencyFuturesCmeExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortAustralianDollarMember | [9]
Unrealized Appreciation (Depreciation) | $ 419,850 us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsSoldMember / us-gaap_InvestmentTypeAxis = ck0001415311_AustralianDollarFxCurrencyFuturesCmeExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortAustralianDollarMember | [9]
[1] | Cash collateral in the amount of $269,253 was pledged to cover margin requirements for open futures contracts as of March 31, 2015.
[2] | Cash collateral in the amount of $55,500,260 was pledged to cover margin requirements for open futures contracts as of March 31, 2015.
[3] | The positions and counterparties herein are as of March 31, 2015. The Funds continually evaluate different counterparties for their transactions and counterparties are subject to change. New counterparties can be added at anytime.
[4] | Cash collateral in the amount of $ 20,594,295 was pledged to cover margin requirements for open futures contracts as of March 31, 2015.
[5] | Cash collateral in the amount of $1,708,036 was pledged to cover margin requirements for open futures contracts as of March 31, 2015.
[6] | Cash collateral in the amount of $8,800 was pledged to cover margin requirements for open futures contracts as of March 31, 2015.
[7] | Cash collateral in the amount of $16,940 was pledged to cover margin requirements for open futures contracts as of March 31, 2015.
[8] | Cash collateral in the amount of $511,500 was pledged to cover margin requirements for open futures contracts as of March 31, 2015.
[9] | Cash collateral in the amount of $382,125 was pledged to cover margin requirements for open futures contracts as of March 31, 2015.

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