v2.4.1.9

Schedule of Investments - Futures Contracts Purchased (Detail) (USD $) | 3 Months Ended
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Mar. 31, 2015 Contract
ProShares Managed Futures Strategy [Member] | Futures Contracts Purchased [Member] |  |
Schedule of Investments [Line Items] |  |
Unrealized Appreciation (Depreciation) | $ (45,184)us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
ProShares Managed Futures Strategy [Member] | Cocoa Futures - ICE, Expires May 2015 [Member] | Futures Contracts Purchased [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 16 ck0001415311_NumberOfContracts / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_CocoaFuturesIceExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Notional Amount at Value | 431,840 ck0001415311_LongShortInvestmentOwnedUnderlyingFaceAmountAtMarketValue / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_CocoaFuturesIceExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Unrealized Appreciation (Depreciation) | (39,713)us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_CocoaFuturesIceExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
ProShares Managed Futures Strategy [Member] | Cotton No. 2 Futures - ICE, Expires May 2015 [Member] | Futures Contracts Purchased [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 8 ck0001415311_NumberOfContracts / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_CottonNoTwoFuturesIceExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Notional Amount at Value | 252,400 ck0001415311_LongShortInvestmentOwnedUnderlyingFaceAmountAtMarketValue / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_CottonNoTwoFuturesIceExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Unrealized Appreciation (Depreciation) | (633)us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_CottonNoTwoFuturesIceExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
ProShares Managed Futures Strategy [Member] | Soybean Futures - CBT, Expires May 2015 [Member] | Futures Contracts Purchased [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 5 ck0001415311_NumberOfContracts / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_SoybeanFuturesCbtExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Notional Amount at Value | 243,313 ck0001415311_LongShortInvestmentOwnedUnderlyingFaceAmountAtMarketValue / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_SoybeanFuturesCbtExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Unrealized Appreciation (Depreciation) | (3,244)us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_SoybeanFuturesCbtExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
ProShares Managed Futures Strategy [Member] | US 10 YR Note Futures - CBT, Expires June 2015 [Member] | Futures Contracts Purchased [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 10 ck0001415311_NumberOfContracts / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_UsTenYrNoteFuturesCbtExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Notional Amount at Value | 1,289,063 ck0001415311_LongShortInvestmentOwnedUnderlyingFaceAmountAtMarketValue / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_UsTenYrNoteFuturesCbtExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
Unrealized Appreciation (Depreciation) | (1,594)us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_UsTenYrNoteFuturesCbtExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1]
ProShares VIX Short-Term Futures ETF [Member] | Futures Contracts Purchased [Member] |  |
Schedule of Investments [Line Items] |  |
Unrealized Appreciation (Depreciation) | (5,106,111)us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember | [2]
ProShares VIX Short-Term Futures ETF [Member] | VIX Futures - CBOE, Expires April 2015 [Member] | Futures Contracts Purchased [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 4,166 ck0001415311_NumberOfContracts / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_VixFuturesCboeExpiresAprilTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember | [2]
Notional Amount at Value | 67,801,650 ck0001415311_LongShortInvestmentOwnedUnderlyingFaceAmountAtMarketValue / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_VixFuturesCboeExpiresAprilTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember | [2]
Unrealized Appreciation (Depreciation) | (5,816,262)us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_VixFuturesCboeExpiresAprilTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember | [2]
ProShares VIX Short-Term Futures ETF [Member] | VIX Futures - CBOE, Expires May 2015 [Member] | Futures Contracts Purchased [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 4,594 ck0001415311_NumberOfContracts / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_VixFuturesCboeExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember | [2]
Notional Amount at Value | 81,888,050 ck0001415311_LongShortInvestmentOwnedUnderlyingFaceAmountAtMarketValue / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_VixFuturesCboeExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember | [2]
Unrealized Appreciation (Depreciation) | 710,151 us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_VixFuturesCboeExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember | [2]
ProShares VIX Mid-Term Futures ETF [Member] | Futures Contracts Purchased [Member] |  |
Schedule of Investments [Line Items] |  |
Unrealized Appreciation (Depreciation) | (500,390)us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember | [3]
ProShares VIX Mid-Term Futures ETF [Member] | VIX Futures - CBOE, Expires July 2015 [Member ] | Futures Contracts Purchased [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 235 ck0001415311_NumberOfContracts / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_VixFuturesCboeExpiresJulyTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember | [3]
Notional Amount at Value | 4,388,625 ck0001415311_LongShortInvestmentOwnedUnderlyingFaceAmountAtMarketValue / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_VixFuturesCboeExpiresJulyTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember | [3]
Unrealized Appreciation (Depreciation) | (167,050)us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_VixFuturesCboeExpiresJulyTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember | [3]
ProShares VIX Mid-Term Futures ETF [Member] | VIX Futures - CBOE, Expires August 2015 [Member] | Futures Contracts Purchased [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 497 ck0001415311_NumberOfContracts / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_VixFuturesCboeExpiresAugustTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember | [3]
Notional Amount at Value | 9,380,875 ck0001415311_LongShortInvestmentOwnedUnderlyingFaceAmountAtMarketValue / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_VixFuturesCboeExpiresAugustTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember | [3]
Unrealized Appreciation (Depreciation) | (449,540)us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_VixFuturesCboeExpiresAugustTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember | [3]
ProShares VIX Mid-Term Futures ETF [Member] | VIX Futures - CBOE, Expires September 2015 [Member] | Futures Contracts Purchased [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 497 ck0001415311_NumberOfContracts / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_VixFuturesCboeExpiresSeptemberTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember | [3]
Notional Amount at Value | 9,529,975 ck0001415311_LongShortInvestmentOwnedUnderlyingFaceAmountAtMarketValue / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_VixFuturesCboeExpiresSeptemberTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember | [3]
Unrealized Appreciation (Depreciation) | 57,125 us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_VixFuturesCboeExpiresSeptemberTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember | [3]
ProShares VIX Mid-Term Futures ETF [Member] | VIX Futures - CBOE, Expires October 2015 [Member] | Futures Contracts Purchased [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 261 ck0001415311_NumberOfContracts / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_VixFuturesCboeExpiresOctoberTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember | [3]
Notional Amount at Value | 5,082,975 ck0001415311_LongShortInvestmentOwnedUnderlyingFaceAmountAtMarketValue / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_VixFuturesCboeExpiresOctoberTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember | [3]
Unrealized Appreciation (Depreciation) | 59,075 us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_VixFuturesCboeExpiresOctoberTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember | [3]
ProShares Ultra VIX Short-Term Futures ETF [Member] | Futures Contracts Purchased [Member] |  |
Schedule of Investments [Line Items] |  |
Unrealized Appreciation (Depreciation) | (48,925,693)us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember | [4]
ProShares Ultra VIX Short-Term Futures ETF [Member] | VIX Futures - CBOE, Expires April 2015 [Member] | Futures Contracts Purchased [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 38,547 ck0001415311_NumberOfContracts / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_VixFuturesCboeExpiresAprilTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember | [4]
Notional Amount at Value | 627,352,425 ck0001415311_LongShortInvestmentOwnedUnderlyingFaceAmountAtMarketValue / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_VixFuturesCboeExpiresAprilTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember | [4]
Unrealized Appreciation (Depreciation) | (55,127,903)us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_VixFuturesCboeExpiresAprilTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember | [4]
ProShares Ultra VIX Short-Term Futures ETF [Member] | VIX Futures - CBOE, Expires May 2015 [Member] | Futures Contracts Purchased [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 42,693 ck0001415311_NumberOfContracts / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_VixFuturesCboeExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember | [4]
Notional Amount at Value | 761,002,725 ck0001415311_LongShortInvestmentOwnedUnderlyingFaceAmountAtMarketValue / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_VixFuturesCboeExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember | [4]
Unrealized Appreciation (Depreciation) | 6,202,210 us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_VixFuturesCboeExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember | [4]
ProShares Ultra Bloomberg Crude Oil [Member] |  |
Schedule of Investments [Line Items] |  |
Unrealized Appreciation (Depreciation) | (78,474,219)us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCrudeOilMember | [5]
ProShares Ultra Bloomberg Crude Oil [Member] | Crude Oil - NYMEX, Expires May 2015 [Member] | Futures Contracts Purchased [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 13,821 ck0001415311_NumberOfContracts / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_CrudeOilNymexExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCrudeOilMember | [6]
Notional Amount at Value | 657,879,600 ck0001415311_LongShortInvestmentOwnedUnderlyingFaceAmountAtMarketValue / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_CrudeOilNymexExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCrudeOilMember | [6]
Unrealized Appreciation (Depreciation) | (63,863,441)us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_CrudeOilNymexExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCrudeOilMember | [6]
ProShares Ultra Bloomberg Natural Gas [Member] | Natural Gas-NYMEX, Expires May 2015 [Member] | Futures Contracts Purchased [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 4,644 ck0001415311_NumberOfContracts / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_NaturalGasNymexExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergNaturalGasMember | [7]
Notional Amount at Value | 122,601,600 ck0001415311_LongShortInvestmentOwnedUnderlyingFaceAmountAtMarketValue / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_NaturalGasNymexExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergNaturalGasMember | [7]
Unrealized Appreciation (Depreciation) | (7,437,631)us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_NaturalGasNymexExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergNaturalGasMember | [7]
ProShares Ultra Gold [Member] |  |
Schedule of Investments [Line Items] |  |
Unrealized Appreciation (Depreciation) | 1,660,968 us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraGoldMember | [5]
ProShares Ultra Gold [Member] | Gold Futures-COMEX, Expires June 2015 [Member] | Futures Contracts Purchased [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 2 ck0001415311_NumberOfContracts / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_GoldFuturesComexExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraGoldMember | [8]
Notional Amount at Value | 236,640 ck0001415311_LongShortInvestmentOwnedUnderlyingFaceAmountAtMarketValue / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_GoldFuturesComexExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraGoldMember | [8]
Unrealized Appreciation (Depreciation) | 6,020 us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_GoldFuturesComexExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraGoldMember | [8]
ProShares Ultra Silver [Member] |  |
Schedule of Investments [Line Items] |  |
Unrealized Appreciation (Depreciation) | 22,620,868 us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraSilverMember | [5]
ProShares Ultra Silver [Member] | Silver Futures-COMEX, Expires May 2015 [Member] | Futures Contracts Purchased [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 2 ck0001415311_NumberOfContracts / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_SilverFuturesComexExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraSilverMember | [9]
Notional Amount at Value | 165,980 ck0001415311_LongShortInvestmentOwnedUnderlyingFaceAmountAtMarketValue / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_SilverFuturesComexExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraSilverMember | [9]
Unrealized Appreciation (Depreciation) | (3,320)us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_SilverFuturesComexExpiresMayTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraSilverMember | [9]
ProShares Ultra Australian Dollar [Member] | Australian Dollar Fx Currency Futures - CME, Expires June 2015 [Member] | Futures Contracts Purchased [Member] |  |
Schedule of Investments [Line Items] |  |
Number of Contracts | 63 ck0001415311_NumberOfContracts / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_AustralianDollarFxCurrencyFuturesCmeExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraAustralianDollarMember | [10]
Notional Amount at Value | 4,776,030 ck0001415311_LongShortInvestmentOwnedUnderlyingFaceAmountAtMarketValue / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_AustralianDollarFxCurrencyFuturesCmeExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraAustralianDollarMember | [10]
Unrealized Appreciation (Depreciation) | $ (57,414)us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet / us-gaap_DerivativeInstrumentRiskAxis = ck0001415311_FuturesContractsPurchasedMember / us-gaap_InvestmentTypeAxis = ck0001415311_AustralianDollarFxCurrencyFuturesCmeExpiresJuneTwoThousandAndFifteenMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraAustralianDollarMember | [10]
[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 $11,020,165 was pledged to cover margin requirements for open futures contracts as of March 31, 2015.
[3] | Cash collateral in the amount of $2,134,050 was pledged to cover margin requirements for open futures contracts as of March 31, 2015.
[4] | Cash collateral in the amount of $73,653,370 was pledged to cover margin requirements for open futures contracts as of March 31, 2015.
[5] | 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.
[6] | Cash collateral in the amount of $13,420,311 was pledged to cover margin requirements for open futures contracts as of March 31, 2015.
[7] | Cash collateral in the amount of $3,842,480 was pledged to cover margin requirements for open futures contracts as of March 31, 2015.
[8] | Cash collateral in the amount of $8,800 was pledged to cover margin requirements for open futures contracts as of March 31, 2015.
[9] | Cash collateral in the amount of $16,940 was pledged to cover margin requirements for open futures contracts as of March 31, 2015.
[10] | Cash collateral in the amount of $152,460 was pledged to cover margin requirements for open futures contracts as of March 31, 2015.

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