v2.4.1.9

Significant Accounting Policies - Valuation of Investments using Fair Value Hierarchy (Detail) (USD $) | Mar. 31, 2015 | Dec. 31, 2014
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ProShares Managed Futures Strategy [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | $ 83,233 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | $ 104,327 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember
ProShares VIX Short-Term Futures ETF [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 126,077,909 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember | 88,352,919 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember
ProShares VIX Mid-Term Futures ETF [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 27,175,022 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember | 24,366,571 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember
ProShares Short VIX Short-Term Futures ETF [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 229,911,927 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember | 430,623,071 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
ProShares Ultra VIX Short-Term Futures ETF [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 520,974,371 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember | 222,224,441 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
ProShares UltraShort Bloomberg Commodity [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 5,267,452 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCommodityMember | 4,800,807 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCommodityMember
ProShares UltraShort Bloomberg Crude Oil [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 363,997,731 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCrudeOilMember | 174,419,288 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
ProShares UltraShort Bloomberg Natural Gas [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 9,839,238 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergNaturalGasMember | 12,614,175 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
ProShares UltraShort Gold [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 77,850,098 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortGoldMember | 81,752,809 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortGoldMember
ProShares UltraShort Silver [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 46,268,582 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember | 52,823,205 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember
ProShares Short Euro [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 18,121,948 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortEuroMember | 12,471,908 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortEuroMember
ProShares UltraShort Australian Dollar [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 17,352,343 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortAustralianDollarMember | 21,011,160 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortAustralianDollarMember
ProShares UltraShort Euro [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 572,841,626 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortEuroMember | 503,874,111 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortEuroMember
ProShares UltraShort Yen [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 444,758,540 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortYenMember | 531,378,971 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortYenMember
ProShares Ultra Bloomberg Commodity [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 2,113,376 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCommodityMember | 2,423,562 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCommodityMember
ProShares Ultra Bloomberg Crude Oil [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 923,776,509 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCrudeOilMember | 344,544,852 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCrudeOilMember
ProShares Ultra Bloomberg Natural Gas [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 49,732,210 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergNaturalGasMember | 18,520,944 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergNaturalGasMember
ProShares Ultra Gold [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 95,901,574 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraGoldMember | 103,983,591 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraGoldMember
ProShares Ultra Silver [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 317,119,181 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraSilverMember | 293,077,531 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraSilverMember
ProShares Ultra Australian Dollar [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 2,144,506 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraAustralianDollarMember | 2,308,860 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraAustralianDollarMember
ProShares Ultra Euro [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 14,464,119 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraEuroMember | 2,312,327 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraEuroMember
ProShares Ultra Yen [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 5,169,013 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraYenMember | 1,272,624 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraYenMember
Total Trust [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 3,870,940,508 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_TrustMember | 2,929,262,054 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_TrustMember
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares VIX Short-Term Futures ETF [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 131,184,020 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember | 82,088,299 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares VIX Mid-Term Futures ETF [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 27,675,412 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember | 24,105,906 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares Short VIX Short-Term Futures ETF [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 222,919,943 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember | 446,975,220 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 569,900,064 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember | 182,639,188 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares UltraShort Bloomberg Commodity [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 4,990,827 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCommodityMember | 4,233,548 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCommodityMember
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares UltraShort Bloomberg Crude Oil [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 319,733,997 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCrudeOilMember | 131,594,608 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares UltraShort Bloomberg Natural Gas [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 8,979,498 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergNaturalGasMember | 8,672,710 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares UltraShort Gold [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 79,438,219 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortGoldMember | 84,040,107 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortGoldMember
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares UltraShort Silver [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 50,001,670 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember | 52,226,692 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares Short Euro [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 18,012,179 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortEuroMember | 12,086,577 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortEuroMember
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares UltraShort Australian Dollar [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 16,932,493 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortAustralianDollarMember | 20,267,679 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortAustralianDollarMember
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares UltraShort Euro [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 549,451,431 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortEuroMember | 487,111,117 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortEuroMember
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares UltraShort Yen [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 444,090,783 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortYenMember | 532,957,746 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortYenMember
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares Ultra Bloomberg Commodity [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 2,242,809 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCommodityMember | 2,754,900 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCommodityMember
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares Ultra Bloomberg Crude Oil [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 1,066,114,169 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCrudeOilMember | 467,200,736 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCrudeOilMember
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares Ultra Bloomberg Natural Gas [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 57,169,841 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergNaturalGasMember | 53,410,227 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergNaturalGasMember
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares Ultra Gold [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 94,234,586 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraGoldMember | 101,927,857 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraGoldMember
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares Ultra Silver [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 294,501,633 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraSilverMember | 305,474,211 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraSilverMember
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares Ultra Australian Dollar [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 2,201,920 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraAustralianDollarMember | 2,405,685 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraAustralianDollarMember
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares Ultra Euro [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 15,242,869 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraEuroMember | 2,415,698 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraEuroMember
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares Ultra Yen [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 5,210,191 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraYenMember | 1,287,869 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraYenMember
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | Total Trust [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 3,980,228,554 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_TrustMember | 3,005,876,580 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentShorttermDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_TrustMember
Level I - Quoted Prices [Member] | VIX Futures Contracts [Member] | ProShares Managed Futures Strategy [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 83,233 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_FutureMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | 104,327 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_FutureMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember
Level I - Quoted Prices [Member] | VIX Futures Contracts [Member] | ProShares VIX Short-Term Futures ETF [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | (5,106,111)us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_FutureMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember | 6,264,620 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_FutureMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember
Level I - Quoted Prices [Member] | VIX Futures Contracts [Member] | ProShares VIX Mid-Term Futures ETF [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | (500,390)us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_FutureMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember | 260,665 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_FutureMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember
Level I - Quoted Prices [Member] | VIX Futures Contracts [Member] | ProShares Short VIX Short-Term Futures ETF [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 6,991,984 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_FutureMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember | (16,352,149)us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_FutureMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
Level I - Quoted Prices [Member] | VIX Futures Contracts [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | (48,925,693)us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_FutureMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember | 39,585,253 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_FutureMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
Level I - Quoted Prices [Member] | VIX Futures Contracts [Member] | ProShares UltraShort Bloomberg Crude Oil [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 17,406,261 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_FutureMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCrudeOilMember | 15,806,603 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_FutureMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
Level I - Quoted Prices [Member] | VIX Futures Contracts [Member] | ProShares UltraShort Bloomberg Natural Gas [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 859,740 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_FutureMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergNaturalGasMember | 3,941,465 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_FutureMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
Level I - Quoted Prices [Member] | VIX Futures Contracts [Member] | ProShares UltraShort Gold [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | (6,040)us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_FutureMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortGoldMember | (4,520)us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_FutureMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortGoldMember
Level I - Quoted Prices [Member] | VIX Futures Contracts [Member] | ProShares UltraShort Silver [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 3,095 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_FutureMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember | 1,560 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_FutureMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember
Level I - Quoted Prices [Member] | VIX Futures Contracts [Member] | ProShares Short Euro [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 109,769 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_FutureMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortEuroMember | 385,331 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_FutureMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortEuroMember
Level I - Quoted Prices [Member] | VIX Futures Contracts [Member] | ProShares UltraShort Australian Dollar [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 419,850 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_FutureMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortAustralianDollarMember | 743,481 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_FutureMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortAustralianDollarMember
Level I - Quoted Prices [Member] | VIX Futures Contracts [Member] | ProShares Ultra Bloomberg Crude Oil [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | (63,863,441)us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_FutureMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCrudeOilMember | (46,474,787)us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_FutureMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCrudeOilMember
Level I - Quoted Prices [Member] | VIX Futures Contracts [Member] | ProShares Ultra Bloomberg Natural Gas [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | (7,437,631)us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_FutureMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergNaturalGasMember | (34,889,283)us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_FutureMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergNaturalGasMember
Level I - Quoted Prices [Member] | VIX Futures Contracts [Member] | ProShares Ultra Gold [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 6,020 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_FutureMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraGoldMember | 4,580 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_FutureMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraGoldMember
Level I - Quoted Prices [Member] | VIX Futures Contracts [Member] | ProShares Ultra Silver [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | (3,320)us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_FutureMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraSilverMember | (1,560)us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_FutureMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraSilverMember
Level I - Quoted Prices [Member] | VIX Futures Contracts [Member] | ProShares Ultra Australian Dollar [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | (57,414)us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_FutureMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraAustralianDollarMember | (96,825)us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_FutureMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraAustralianDollarMember
Level I - Quoted Prices [Member] | VIX Futures Contracts [Member] | Total Trust [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | (100,020,088)us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_FutureMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_TrustMember | (30,721,239)us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_FutureMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_TrustMember
Level II - Other Significant Observable Inputs [Member] | Forward Agreements [Member] | ProShares UltraShort Gold [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | (1,582,081)us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_ForwardContractsMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortGoldMember | (2,282,778)us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_ForwardContractsMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortGoldMember
Level II - Other Significant Observable Inputs [Member] | Forward Agreements [Member] | ProShares UltraShort Silver [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | (3,736,183)us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_ForwardContractsMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember | 594,953 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_ForwardContractsMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember
Level II - Other Significant Observable Inputs [Member] | Forward Agreements [Member] | ProShares Ultra Gold [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 1,660,968 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_ForwardContractsMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraGoldMember | 2,051,154 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_ForwardContractsMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraGoldMember
Level II - Other Significant Observable Inputs [Member] | Forward Agreements [Member] | ProShares Ultra Silver [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 22,620,868 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_ForwardContractsMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraSilverMember | (12,395,120)us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_ForwardContractsMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraSilverMember
Level II - Other Significant Observable Inputs [Member] | Forward Agreements [Member] | Total Trust [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 18,963,572 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_ForwardContractsMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_TrustMember | (12,031,791)us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_ForwardContractsMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_TrustMember
Level II - Other Significant Observable Inputs [Member] | Foreign Currency Forward Contracts [Member] | ProShares UltraShort Euro [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 23,390,195 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortEuroMember | 16,762,994 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortEuroMember
Level II - Other Significant Observable Inputs [Member] | Foreign Currency Forward Contracts [Member] | ProShares UltraShort Yen [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 667,757 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortYenMember | (1,578,775)us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortYenMember
Level II - Other Significant Observable Inputs [Member] | Foreign Currency Forward Contracts [Member] | ProShares Ultra Euro [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | (778,750)us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraEuroMember | (103,371)us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraEuroMember
Level II - Other Significant Observable Inputs [Member] | Foreign Currency Forward Contracts [Member] | ProShares Ultra Yen [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | (41,178)us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraYenMember | (15,245)us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraYenMember
Level II - Other Significant Observable Inputs [Member] | Foreign Currency Forward Contracts [Member] | Total Trust [Member] |  |
Significant Accounting Policies [Line Items] |  |
Investments, fair value disclosure | 23,238,024 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_TrustMember | 15,065,603 us-gaap_AlternativeInvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_TrustMember
Level II - Other Significant Observable Inputs [Member] | Swap Agreements [Member] | ProShares UltraShort Bloomberg Commodity [Member] |  |
Significant Accounting Policies [Line Items] |  |
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