v2.4.1.9
Statements of Financial Condition (USD $)
Mar. 31, 2015
Dec. 31, 2014
ProShares Managed Futures Strategy [Member]    
Assets    
Cash $ 8,302,902us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesManagedFuturesStrategyMember
[1] $ 6,135,185us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesManagedFuturesStrategyMember
[1]
Segregated cash balances with brokers for futures contracts 269,253ck0001415311_SegregatedCashBalancesWithBrokersForFuturesContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesManagedFuturesStrategyMember
195,142ck0001415311_SegregatedCashBalancesWithBrokersForFuturesContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesManagedFuturesStrategyMember
Receivable on open futures contracts 37,013us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesManagedFuturesStrategyMember
17,445us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesManagedFuturesStrategyMember
Offering costs 33,164ck0001415311_OfferingCosts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesManagedFuturesStrategyMember
49,384ck0001415311_OfferingCosts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesManagedFuturesStrategyMember
Limitation by Sponsor 11,008ck0001415311_LimitationBySponsor
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesManagedFuturesStrategyMember
9,474ck0001415311_LimitationBySponsor
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesManagedFuturesStrategyMember
Total assets 8,653,340us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesManagedFuturesStrategyMember
6,406,630us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesManagedFuturesStrategyMember
Liabilities    
Payable for offering costs 65,785ck0001415311_PayableForOfferingCosts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesManagedFuturesStrategyMember
65,785ck0001415311_PayableForOfferingCosts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesManagedFuturesStrategyMember
Total liabilities 65,785us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesManagedFuturesStrategyMember
65,785us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesManagedFuturesStrategyMember
Commitments and Contingencies      
Shareholders' equity    
Shareholders' equity 8,587,555us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesManagedFuturesStrategyMember
6,340,845us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesManagedFuturesStrategyMember
Total liabilities and shareholders' equity 8,653,340us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesManagedFuturesStrategyMember
6,406,630us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesManagedFuturesStrategyMember
Shares outstanding 400,010us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesManagedFuturesStrategyMember
300,010us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesManagedFuturesStrategyMember
Net asset value per share $ 21.4684ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesManagedFuturesStrategyMember
$ 21.1354ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesManagedFuturesStrategyMember
Market value per share $ 21.50ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesManagedFuturesStrategyMember
$ 21.28ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesManagedFuturesStrategyMember
ProShares VIX Short-Term Futures ETF [Member]    
Assets    
Cash 2,165,472us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixShortTermFuturesEtfMember
1,694,791us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixShortTermFuturesEtfMember
Segregated cash balances with brokers for futures contracts 11,020,165ck0001415311_SegregatedCashBalancesWithBrokersForFuturesContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixShortTermFuturesEtfMember
18,439,750ck0001415311_SegregatedCashBalancesWithBrokersForFuturesContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixShortTermFuturesEtfMember
Short-term U.S. government and agency obligations 131,184,020us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixShortTermFuturesEtfMember
82,088,299us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixShortTermFuturesEtfMember
Receivable on open futures contracts 5,219,208us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixShortTermFuturesEtfMember
9,317,236us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixShortTermFuturesEtfMember
Total assets 149,588,865us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixShortTermFuturesEtfMember
111,540,076us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixShortTermFuturesEtfMember
Liabilities    
Management fee payable 101,356us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixShortTermFuturesEtfMember
80,751us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixShortTermFuturesEtfMember
Total liabilities 101,356us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixShortTermFuturesEtfMember
80,751us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixShortTermFuturesEtfMember
Commitments and Contingencies      
Shareholders' equity    
Shareholders' equity 149,487,509us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixShortTermFuturesEtfMember
111,459,325us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixShortTermFuturesEtfMember
Total liabilities and shareholders' equity 149,588,865us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixShortTermFuturesEtfMember
111,540,076us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixShortTermFuturesEtfMember
Shares outstanding 8,749,812us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixShortTermFuturesEtfMember
5,324,812us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixShortTermFuturesEtfMember
Net asset value per share $ 17.0847ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixShortTermFuturesEtfMember
$ 20.9321ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixShortTermFuturesEtfMember
Market value per share $ 17.01ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixShortTermFuturesEtfMember
$ 20.99ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixShortTermFuturesEtfMember
ProShares VIX Mid-Term Futures ETF [Member]    
Assets    
Cash 1,303,894us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixMidTermFuturesEtfMember
1,634,082us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixMidTermFuturesEtfMember
Segregated cash balances with brokers for futures contracts 2,134,050ck0001415311_SegregatedCashBalancesWithBrokersForFuturesContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixMidTermFuturesEtfMember
1,906,950ck0001415311_SegregatedCashBalancesWithBrokersForFuturesContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixMidTermFuturesEtfMember
Short-term U.S. government and agency obligations 27,675,412us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixMidTermFuturesEtfMember
24,105,906us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixMidTermFuturesEtfMember
Receivable on open futures contracts 321,319us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixMidTermFuturesEtfMember
1,783,328us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixMidTermFuturesEtfMember
Total assets 31,434,675us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixMidTermFuturesEtfMember
29,430,266us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixMidTermFuturesEtfMember
Liabilities    
Payable for capital shares redeemed 3,034,067ck0001415311_PayableForCapitalSharesRedeemed
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixMidTermFuturesEtfMember
7,947,955ck0001415311_PayableForCapitalSharesRedeemed
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixMidTermFuturesEtfMember
Management fee payable 21,578us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixMidTermFuturesEtfMember
22,736us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixMidTermFuturesEtfMember
Total liabilities 3,055,645us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixMidTermFuturesEtfMember
7,970,691us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixMidTermFuturesEtfMember
Commitments and Contingencies      
Shareholders' equity    
Shareholders' equity 28,379,030us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixMidTermFuturesEtfMember
21,459,575us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixMidTermFuturesEtfMember
Total liabilities and shareholders' equity 31,434,675us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixMidTermFuturesEtfMember
29,430,266us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixMidTermFuturesEtfMember
Shares outstanding 462,404us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixMidTermFuturesEtfMember
337,404us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixMidTermFuturesEtfMember
Net asset value per share $ 61.3728ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixMidTermFuturesEtfMember
$ 63.6020ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixMidTermFuturesEtfMember
Market value per share $ 61.09ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixMidTermFuturesEtfMember
$ 63.89ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesVixMidTermFuturesEtfMember
ProShares Short VIX Short-Term Futures ETF [Member]    
Assets    
Cash 4,143,193us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
9,122,219us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
Segregated cash balances with brokers for futures contracts 55,500,260ck0001415311_SegregatedCashBalancesWithBrokersForFuturesContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
85,244,950ck0001415311_SegregatedCashBalancesWithBrokersForFuturesContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
Short-term U.S. government and agency obligations 222,919,943us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
446,975,220us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
Total assets 282,563,396us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
541,342,389us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
Liabilities    
Payable for capital shares redeemed   3,358,781ck0001415311_PayableForCapitalSharesRedeemed
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
Payable on open futures contracts 1,425,781us-gaap_PayablesToBrokerDealersAndClearingOrganizations
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
31,020,019us-gaap_PayablesToBrokerDealersAndClearingOrganizations
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
Management fee payable 286,643us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
407,465us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
Total liabilities 1,712,424us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
34,786,265us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
Commitments and Contingencies      
Shareholders' equity    
Shareholders' equity 280,850,972us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
506,556,124us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
Total liabilities and shareholders' equity 282,563,396us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
541,342,389us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
Shares outstanding 4,150,040us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
8,250,040us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
Net asset value per share $ 67.6743ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
$ 61.4004ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
Market value per share $ 68.04ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
$ 61.16ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
ProShares Ultra VIX Short-Term Futures ETF [Member]    
Assets    
Cash 5,478,753us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
3,737,292us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
Segregated cash balances with brokers for futures contracts 73,653,370ck0001415311_SegregatedCashBalancesWithBrokersForFuturesContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
116,907,700ck0001415311_SegregatedCashBalancesWithBrokersForFuturesContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
Short-term U.S. government and agency obligations 569,900,064us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
182,639,188us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
Receivable from capital shares sold 7,900,647ck0001415311_ReceivableForCapitalSharesSold
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
12,549,248ck0001415311_ReceivableForCapitalSharesSold
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
Receivable on open futures contracts 37,350,672us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
42,531,441us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
Total assets 694,283,506us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
358,364,869us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
Liabilities    
Payable for capital shares redeemed   6,272,056ck0001415311_PayableForCapitalSharesRedeemed
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
Management fee payable 563,422us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
302,860us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
Total liabilities 563,422us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
6,574,916us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
Commitments and Contingencies      
Shareholders' equity    
Shareholders' equity 693,720,084us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
351,789,953us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
Total liabilities and shareholders' equity 694,283,506us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
358,364,869us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
Shares outstanding 45,670,099us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
14,020,099us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
Net asset value per share $ 15.1898ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
$ 25.0918ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
Market value per share $ 15.05ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
$ 25.15ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
ProShares UltraShort Bloomberg Commodity [Member]    
Assets    
Cash 555,463us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCommodityMember
467,766us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCommodityMember
Short-term U.S. government and agency obligations 4,990,827us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCommodityMember
4,233,548us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCommodityMember
Unrealized appreciation on swap agreements 276,625us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciation
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCommodityMember
567,259us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciation
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCommodityMember
Total assets 5,822,915us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCommodityMember
5,268,573us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCommodityMember
Liabilities    
Management fee payable 4,552us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCommodityMember
3,867us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCommodityMember
Total liabilities 4,552us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCommodityMember
3,867us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCommodityMember
Commitments and Contingencies      
Shareholders' equity    
Shareholders' equity 5,818,363us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCommodityMember
5,264,706us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCommodityMember
Total liabilities and shareholders' equity 5,822,915us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCommodityMember
5,268,573us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCommodityMember
Shares outstanding 59,997us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCommodityMember
59,997us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCommodityMember
Net asset value per share $ 96.9776ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCommodityMember
$ 87.7495ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCommodityMember
Market value per share $ 98.25ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCommodityMember
$ 87.44ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCommodityMember
ProShares UltraShort Bloomberg Crude Oil [Member]    
Assets    
Cash 6,869,907us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
994,268us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
Segregated cash balances with brokers for futures contracts 20,594,295ck0001415311_SegregatedCashBalancesWithBrokersForFuturesContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
12,292,665ck0001415311_SegregatedCashBalancesWithBrokersForFuturesContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
Short-term U.S. government and agency obligations 319,733,997us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
131,594,608us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
Unrealized appreciation on swap agreements 26,857,473us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciation
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
27,018,077us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciation
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
Receivable on open futures contracts 4,822,119us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
1,293,531us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
Total assets 378,877,791us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
173,193,149us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
Liabilities    
Payable for capital shares redeemed 8,302,977ck0001415311_PayableForCapitalSharesRedeemed
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
3,854,654ck0001415311_PayableForCapitalSharesRedeemed
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
Management fee payable 237,809us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
128,385us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
Total liabilities 8,540,786us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
3,983,039us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
Commitments and Contingencies      
Shareholders' equity    
Shareholders' equity 370,337,005us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
169,210,110us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
Total liabilities and shareholders' equity 378,877,791us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
173,193,149us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
Shares outstanding 4,269,944us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
2,169,944us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
Net asset value per share $ 86.7311ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
$ 77.9790ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
Market value per share $ 87.14ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
$ 76.52ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
ProShares UltraShort Bloomberg Natural Gas [Member]    
Assets    
Cash 258,382us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
696,743us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
Segregated cash balances with brokers for futures contracts 1,708,036ck0001415311_SegregatedCashBalancesWithBrokersForFuturesContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
4,405,830ck0001415311_SegregatedCashBalancesWithBrokersForFuturesContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
Short-term U.S. government and agency obligations 8,979,498us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
8,672,710us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
Receivable on open futures contracts   923,531us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
Total assets 10,945,916us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
14,698,814us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
Liabilities    
Payable on open futures contracts 5,985us-gaap_PayablesToBrokerDealersAndClearingOrganizations
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
 
Management fee payable 8,361us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
10,250us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
Total liabilities 14,346us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
10,250us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
Commitments and Contingencies      
Shareholders' equity    
Shareholders' equity 10,931,570us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
14,688,564us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
Total liabilities and shareholders' equity 10,945,916us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
14,698,814us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
Shares outstanding 124,952us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
174,952us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
Net asset value per share $ 87.4862ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
$ 83.9577ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
Market value per share $ 87.54ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
$ 82.03ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
ProShares UltraShort Gold [Member]    
Assets    
Cash 164,117us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortGoldMember
162,434us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortGoldMember
Segregated cash balances with brokers for futures contracts 8,800ck0001415311_SegregatedCashBalancesWithBrokersForFuturesContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortGoldMember
8,800ck0001415311_SegregatedCashBalancesWithBrokersForFuturesContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortGoldMember
Short-term U.S. government and agency obligations 79,438,219us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortGoldMember
84,040,107us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortGoldMember
Receivable on open futures contracts 392us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortGoldMember
3,260us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortGoldMember
Total assets 79,611,528us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortGoldMember
84,214,601us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortGoldMember
Liabilities    
Management fee payable 68,833us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortGoldMember
70,061us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortGoldMember
Unrealized depreciation on forward agreements 1,582,081ck0001415311_UnrealizedDepreciationOnForwardAgreements
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortGoldMember
2,282,778ck0001415311_UnrealizedDepreciationOnForwardAgreements
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortGoldMember
Total liabilities 1,650,914us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortGoldMember
2,352,839us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortGoldMember
Commitments and Contingencies      
Shareholders' equity    
Shareholders' equity 77,960,614us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortGoldMember
81,861,762us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortGoldMember
Total liabilities and shareholders' equity 79,611,528us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortGoldMember
84,214,601us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortGoldMember
Shares outstanding 796,978us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortGoldMember
846,978us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortGoldMember
Net asset value per share $ 97.8203ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortGoldMember
$ 96.6516ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortGoldMember
Market value per share $ 98.18ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortGoldMember
$ 100.22ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortGoldMember
ProShares UltraShort Silver [Member]    
Assets    
Cash 145,419us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortSilverMember
207,506us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortSilverMember
Segregated cash balances with brokers for futures contracts 16,940ck0001415311_SegregatedCashBalancesWithBrokersForFuturesContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortSilverMember
14,300ck0001415311_SegregatedCashBalancesWithBrokersForFuturesContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortSilverMember
Short-term U.S. government and agency obligations 50,001,670us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortSilverMember
52,226,692us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortSilverMember
Unrealized appreciation on forward agreements   799,523ck0001415311_UnrealizedAppreciationOnForwardAgreements
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortSilverMember
Receivable from capital shares sold 10,118,943ck0001415311_ReceivableForCapitalSharesSold
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortSilverMember
 
Receivable on open futures contracts 760us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortSilverMember
6,770us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortSilverMember
Total assets 60,283,732us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortSilverMember
53,254,791us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortSilverMember
Liabilities    
Management fee payable 43,050us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortSilverMember
42,354us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortSilverMember
Unrealized depreciation on forward agreements 3,736,183ck0001415311_UnrealizedDepreciationOnForwardAgreements
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortSilverMember
204,570ck0001415311_UnrealizedDepreciationOnForwardAgreements
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortSilverMember
Total liabilities 3,779,233us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortSilverMember
246,924us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortSilverMember
Commitments and Contingencies      
Shareholders' equity    
Shareholders' equity 56,504,499us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortSilverMember
53,007,867us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortSilverMember
Total liabilities and shareholders' equity 60,283,732us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortSilverMember
53,254,791us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortSilverMember
Shares outstanding 558,489us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortSilverMember
458,489us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortSilverMember
Net asset value per share $ 101.1739ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortSilverMember
$ 115.6143ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortSilverMember
Market value per share $ 100.85ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortSilverMember
$ 119.39ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortSilverMember
ProShares Short Euro [Member]    
Assets    
Cash 1,534,250us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortEuroMember
1,640,225us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortEuroMember
Segregated cash balances with brokers for futures contracts 511,500ck0001415311_SegregatedCashBalancesWithBrokersForFuturesContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortEuroMember
242,880ck0001415311_SegregatedCashBalancesWithBrokersForFuturesContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortEuroMember
Short-term U.S. government and agency obligations 18,012,179us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortEuroMember
12,086,577us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortEuroMember
Receivable on open futures contracts 141,325us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortEuroMember
63,250us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortEuroMember
Total assets 20,199,254us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortEuroMember
14,032,932us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortEuroMember
Liabilities    
Management fee payable 15,251us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortEuroMember
11,128us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortEuroMember
Total liabilities 15,251us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortEuroMember
11,128us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortEuroMember
Commitments and Contingencies      
Shareholders' equity    
Shareholders' equity 20,184,003us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortEuroMember
14,021,804us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortEuroMember
Total liabilities and shareholders' equity 20,199,254us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortEuroMember
14,032,932us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortEuroMember
Shares outstanding 450,005us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortEuroMember
350,005us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortEuroMember
Net asset value per share $ 44.8528ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortEuroMember
$ 40.0617ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortEuroMember
Market value per share $ 44.87ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortEuroMember
$ 40.03ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesShortEuroMember
ProShares UltraShort Australian Dollar [Member]    
Assets    
Cash 2,623,624us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortAustralianDollarMember
1,788,757us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortAustralianDollarMember
Segregated cash balances with brokers for futures contracts 382,125ck0001415311_SegregatedCashBalancesWithBrokersForFuturesContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortAustralianDollarMember
1,020,217ck0001415311_SegregatedCashBalancesWithBrokersForFuturesContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortAustralianDollarMember
Short-term U.S. government and agency obligations 16,932,493us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortAustralianDollarMember
20,267,679us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortAustralianDollarMember
Receivable on open futures contracts 182,288us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortAustralianDollarMember
62,534us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortAustralianDollarMember
Total assets 20,120,530us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortAustralianDollarMember
23,139,187us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortAustralianDollarMember
Liabilities    
Management fee payable 15,595us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortAustralianDollarMember
18,397us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortAustralianDollarMember
Total liabilities 15,595us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortAustralianDollarMember
18,397us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortAustralianDollarMember
Commitments and Contingencies      
Shareholders' equity    
Shareholders' equity 20,104,935us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortAustralianDollarMember
23,120,790us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortAustralianDollarMember
Total liabilities and shareholders' equity 20,120,530us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortAustralianDollarMember
23,139,187us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortAustralianDollarMember
Shares outstanding 350,005us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortAustralianDollarMember
450,005us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortAustralianDollarMember
Net asset value per share $ 57.4419ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortAustralianDollarMember
$ 51.3790ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortAustralianDollarMember
Market value per share $ 57.34ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortAustralianDollarMember
$ 51.37ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortAustralianDollarMember
ProShares UltraShort Euro [Member]    
Assets    
Cash 275,163us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortEuroMember
746,454us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortEuroMember
Short-term U.S. government and agency obligations 549,451,431us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortEuroMember
487,111,117us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortEuroMember
Unrealized appreciation on foreign currency forward contracts 25,478,862ck0001415311_UnrealizedAppreciationOnForeignCurrencyForwardContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortEuroMember
19,019,765ck0001415311_UnrealizedAppreciationOnForeignCurrencyForwardContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortEuroMember
Receivable from capital shares sold 47,160,400ck0001415311_ReceivableForCapitalSharesSold
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortEuroMember
12,956,604ck0001415311_ReceivableForCapitalSharesSold
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortEuroMember
Total assets 622,365,856us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortEuroMember
519,833,940us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortEuroMember
Liabilities    
Management fee payable 437,633us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortEuroMember
385,820us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortEuroMember
Unrealized depreciation on foreign currency forward contracts 2,088,667ck0001415311_UnrealizedDepreciationOnForeignCurrencyForwardContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortEuroMember
2,256,771ck0001415311_UnrealizedDepreciationOnForeignCurrencyForwardContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortEuroMember
Total liabilities 2,526,300us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortEuroMember
2,642,591us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortEuroMember
Commitments and Contingencies      
Shareholders' equity    
Shareholders' equity 619,839,556us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortEuroMember
517,191,349us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortEuroMember
Total liabilities and shareholders' equity 622,365,856us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortEuroMember
519,833,940us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortEuroMember
Shares outstanding 23,000,014us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortEuroMember
23,950,014us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortEuroMember
Net asset value per share $ 26.9495ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortEuroMember
$ 21.5946ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortEuroMember
Market value per share $ 26.95ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortEuroMember
$ 21.61ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortEuroMember
ProShares UltraShort Yen [Member]    
Assets    
Cash 446,091us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortYenMember
532,706us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortYenMember
Short-term U.S. government and agency obligations 444,090,783us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortYenMember
532,957,746us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortYenMember
Unrealized appreciation on foreign currency forward contracts 725,490ck0001415311_UnrealizedAppreciationOnForeignCurrencyForwardContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortYenMember
571,149ck0001415311_UnrealizedAppreciationOnForeignCurrencyForwardContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortYenMember
Total assets 445,262,364us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortYenMember
534,061,601us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortYenMember
Liabilities    
Payable for capital shares redeemed 4,448,693ck0001415311_PayableForCapitalSharesRedeemed
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortYenMember
 
Management fee payable 393,931us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortYenMember
439,804us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortYenMember
Unrealized depreciation on foreign currency forward contracts 57,733ck0001415311_UnrealizedDepreciationOnForeignCurrencyForwardContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortYenMember
2,149,924ck0001415311_UnrealizedDepreciationOnForeignCurrencyForwardContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortYenMember
Total liabilities 4,900,357us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortYenMember
2,589,728us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortYenMember
Commitments and Contingencies      
Shareholders' equity    
Shareholders' equity 440,362,007us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortYenMember
531,471,873us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortYenMember
Total liabilities and shareholders' equity 445,262,364us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortYenMember
534,061,601us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortYenMember
Shares outstanding 4,949,294us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortYenMember
5,949,294us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortYenMember
Net asset value per share $ 88.9747ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortYenMember
$ 89.3336ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortYenMember
Market value per share $ 88.91ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortYenMember
$ 89.30ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltrashortYenMember
ProShares Ultra Bloomberg Commodity [Member]    
Assets    
Cash 171,443us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCommodityMember
185,684us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCommodityMember
Short-term U.S. government and agency obligations 2,242,809us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCommodityMember
2,754,900us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCommodityMember
Total assets 2,414,252us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCommodityMember
2,940,584us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCommodityMember
Liabilities    
Management fee payable 1,911us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCommodityMember
2,326us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCommodityMember
Unrealized depreciation on swap agreements 129,433us-gaap_InvestmentOwnedUnrecognizedUnrealizedDepreciation
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCommodityMember
331,338us-gaap_InvestmentOwnedUnrecognizedUnrealizedDepreciation
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCommodityMember
Total liabilities 131,344us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCommodityMember
333,664us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCommodityMember
Commitments and Contingencies      
Shareholders' equity    
Shareholders' equity 2,282,908us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCommodityMember
2,606,920us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCommodityMember
Total liabilities and shareholders' equity 2,414,252us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCommodityMember
2,940,584us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCommodityMember
Shares outstanding 200,014us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCommodityMember
200,014us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCommodityMember
Net asset value per share $ 11.4137ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCommodityMember
$ 13.0337ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCommodityMember
Market value per share $ 11.70ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCommodityMember
$ 12.86ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCommodityMember
ProShares Ultra Bloomberg Crude Oil [Member]    
Assets    
Cash 5,024,406us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCrudeOilMember
2,349,384us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCrudeOilMember
Segregated cash balances with brokers for futures contracts 13,420,311ck0001415311_SegregatedCashBalancesWithBrokersForFuturesContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCrudeOilMember
34,605,120ck0001415311_SegregatedCashBalancesWithBrokersForFuturesContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCrudeOilMember
Short-term U.S. government and agency obligations 1,066,114,169us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCrudeOilMember
467,200,736us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCrudeOilMember
Receivable from capital shares sold 18,414,719ck0001415311_ReceivableForCapitalSharesSold
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCrudeOilMember
28,726,173ck0001415311_ReceivableForCapitalSharesSold
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCrudeOilMember
Total assets 1,102,973,605us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCrudeOilMember
532,881,413us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCrudeOilMember
Liabilities    
Payable for capital shares redeemed 5,037,901ck0001415311_PayableForCapitalSharesRedeemed
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCrudeOilMember
 
Payable on open futures contracts 14,040,754us-gaap_PayablesToBrokerDealersAndClearingOrganizations
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCrudeOilMember
5,817,266us-gaap_PayablesToBrokerDealersAndClearingOrganizations
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCrudeOilMember
Management fee payable 789,703us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCrudeOilMember
320,062us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCrudeOilMember
Unrealized depreciation on swap agreements 78,474,219us-gaap_InvestmentOwnedUnrecognizedUnrealizedDepreciation
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCrudeOilMember
76,181,097us-gaap_InvestmentOwnedUnrecognizedUnrealizedDepreciation
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCrudeOilMember
Total liabilities 98,342,577us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCrudeOilMember
82,318,425us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCrudeOilMember
Commitments and Contingencies      
Shareholders' equity    
Shareholders' equity 1,004,631,028us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCrudeOilMember
450,562,988us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCrudeOilMember
Total liabilities and shareholders' equity 1,102,973,605us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCrudeOilMember
532,881,413us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCrudeOilMember
Shares outstanding 147,199,170us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCrudeOilMember
44,399,170us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCrudeOilMember
Net asset value per share $ 6.8250ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCrudeOilMember
$ 10.1480ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCrudeOilMember
Market value per share $ 6.79ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCrudeOilMember
$ 10.37ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergCrudeOilMember
ProShares Ultra Bloomberg Natural Gas [Member]    
Assets    
Cash 513,008us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergNaturalGasMember
1,653,582us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergNaturalGasMember
Segregated cash balances with brokers for futures contracts 3,842,480ck0001415311_SegregatedCashBalancesWithBrokersForFuturesContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergNaturalGasMember
21,134,080ck0001415311_SegregatedCashBalancesWithBrokersForFuturesContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergNaturalGasMember
Short-term U.S. government and agency obligations 57,169,841us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergNaturalGasMember
53,410,227us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergNaturalGasMember
Receivable from capital shares sold   3,853,422ck0001415311_ReceivableForCapitalSharesSold
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergNaturalGasMember
Total assets 61,525,329us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergNaturalGasMember
80,051,311us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergNaturalGasMember
Liabilities    
Payable on open futures contracts 164,188us-gaap_PayablesToBrokerDealersAndClearingOrganizations
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergNaturalGasMember
9,552,314us-gaap_PayablesToBrokerDealersAndClearingOrganizations
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergNaturalGasMember
Management fee payable 54,848us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergNaturalGasMember
65,790us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergNaturalGasMember
Total liabilities 219,036us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergNaturalGasMember
9,618,104us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergNaturalGasMember
Commitments and Contingencies      
Shareholders' equity    
Shareholders' equity 61,306,293us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergNaturalGasMember
70,433,207us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergNaturalGasMember
Total liabilities and shareholders' equity 61,525,329us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergNaturalGasMember
80,051,311us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergNaturalGasMember
Shares outstanding 5,369,941us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergNaturalGasMember
4,569,941us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergNaturalGasMember
Net asset value per share $ 11.4166ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergNaturalGasMember
$ 15.4123ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergNaturalGasMember
Market value per share $ 11.39ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergNaturalGasMember
$ 15.78ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraBloombergNaturalGasMember
ProShares Ultra Gold [Member]    
Assets    
Cash 122,188us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraGoldMember
104,145us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraGoldMember
Segregated cash balances with brokers for futures contracts 8,800ck0001415311_SegregatedCashBalancesWithBrokersForFuturesContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraGoldMember
8,800ck0001415311_SegregatedCashBalancesWithBrokersForFuturesContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraGoldMember
Short-term U.S. government and agency obligations 94,234,586us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraGoldMember
101,927,857us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraGoldMember
Unrealized appreciation on forward agreements 1,660,968ck0001415311_UnrealizedAppreciationOnForwardAgreements
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraGoldMember
2,051,154ck0001415311_UnrealizedAppreciationOnForwardAgreements
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraGoldMember
Total assets 96,026,542us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraGoldMember
104,091,956us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraGoldMember
Liabilities    
Payable for capital shares redeemed   1,999,718ck0001415311_PayableForCapitalSharesRedeemed
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraGoldMember
Payable on open futures contracts 420us-gaap_PayablesToBrokerDealersAndClearingOrganizations
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraGoldMember
3,260us-gaap_PayablesToBrokerDealersAndClearingOrganizations
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraGoldMember
Management fee payable 76,662us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraGoldMember
85,633us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraGoldMember
Total liabilities 77,082us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraGoldMember
2,088,611us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraGoldMember
Commitments and Contingencies      
Shareholders' equity    
Shareholders' equity 95,949,460us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraGoldMember
102,003,345us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraGoldMember
Total liabilities and shareholders' equity 96,026,542us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraGoldMember
104,091,956us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraGoldMember
Shares outstanding 2,500,014us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraGoldMember
2,550,014us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraGoldMember
Net asset value per share $ 38.3796ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraGoldMember
$ 40.0011ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraGoldMember
Market value per share $ 38.14ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraGoldMember
$ 38.41ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraGoldMember
ProShares Ultra Silver [Member]    
Assets    
Cash 289,618us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraSilverMember
305,004us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraSilverMember
Segregated cash balances with brokers for futures contracts 16,940ck0001415311_SegregatedCashBalancesWithBrokersForFuturesContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraSilverMember
14,300ck0001415311_SegregatedCashBalancesWithBrokersForFuturesContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraSilverMember
Short-term U.S. government and agency obligations 294,501,633us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraSilverMember
305,474,211us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraSilverMember
Unrealized appreciation on forward agreements 22,620,868ck0001415311_UnrealizedAppreciationOnForwardAgreements
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraSilverMember
 
Total assets 317,429,059us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraSilverMember
305,793,515us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraSilverMember
Liabilities    
Payable for capital shares redeemed   1,967,832ck0001415311_PayableForCapitalSharesRedeemed
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraSilverMember
Payable on open futures contracts 760us-gaap_PayablesToBrokerDealersAndClearingOrganizations
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraSilverMember
6,770us-gaap_PayablesToBrokerDealersAndClearingOrganizations
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraSilverMember
Management fee payable 245,442us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraSilverMember
254,050us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraSilverMember
Unrealized depreciation on forward agreements   12,395,120ck0001415311_UnrealizedDepreciationOnForwardAgreements
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraSilverMember
Total liabilities 246,202us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraSilverMember
14,623,772us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraSilverMember
Commitments and Contingencies      
Shareholders' equity    
Shareholders' equity 317,182,857us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraSilverMember
291,169,743us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraSilverMember
Total liabilities and shareholders' equity 317,429,059us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraSilverMember
305,793,515us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraSilverMember
Shares outstanding 7,646,533us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraSilverMember
7,396,533us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraSilverMember
Net asset value per share $ 41.4806ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraSilverMember
$ 39.3657ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraSilverMember
Market value per share $ 41.69ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraSilverMember
$ 38.05ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraSilverMember
ProShares Ultra Australian Dollar [Member]    
Assets    
Cash 66,124us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraAustralianDollarMember
222,968us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraAustralianDollarMember
Segregated cash balances with brokers for futures contracts 152,460ck0001415311_SegregatedCashBalancesWithBrokersForFuturesContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraAustralianDollarMember
120,131ck0001415311_SegregatedCashBalancesWithBrokersForFuturesContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraAustralianDollarMember
Short-term U.S. government and agency obligations 2,201,920us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraAustralianDollarMember
2,405,685us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraAustralianDollarMember
Total assets 2,420,504us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraAustralianDollarMember
2,748,784us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraAustralianDollarMember
Liabilities    
Payable on open futures contracts 21,232us-gaap_PayablesToBrokerDealersAndClearingOrganizations
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraAustralianDollarMember
6,369us-gaap_PayablesToBrokerDealersAndClearingOrganizations
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraAustralianDollarMember
Management fee payable 1,996us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraAustralianDollarMember
2,248us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraAustralianDollarMember
Total liabilities 23,228us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraAustralianDollarMember
8,617us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraAustralianDollarMember
Commitments and Contingencies      
Shareholders' equity    
Shareholders' equity 2,397,276us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraAustralianDollarMember
2,740,167us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraAustralianDollarMember
Total liabilities and shareholders' equity 2,420,504us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraAustralianDollarMember
2,748,784us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraAustralianDollarMember
Shares outstanding 100,005us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraAustralianDollarMember
100,005us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraAustralianDollarMember
Net asset value per share $ 23.9716ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraAustralianDollarMember
$ 27.4003ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraAustralianDollarMember
Market value per share $ 24.20ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraAustralianDollarMember
$ 27.43ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraAustralianDollarMember
ProShares Ultra Euro [Member]    
Assets    
Cash 311,421us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraEuroMember
671,117us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraEuroMember
Short-term U.S. government and agency obligations 15,242,869us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraEuroMember
2,415,698us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraEuroMember
Unrealized appreciation on foreign currency forward contracts 2,045ck0001415311_UnrealizedAppreciationOnForeignCurrencyForwardContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraEuroMember
2,921ck0001415311_UnrealizedAppreciationOnForeignCurrencyForwardContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraEuroMember
Total assets 15,556,335us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraEuroMember
3,089,736us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraEuroMember
Liabilities    
Management fee payable 9,764us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraEuroMember
2,003us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraEuroMember
Unrealized depreciation on foreign currency forward contracts 780,795ck0001415311_UnrealizedDepreciationOnForeignCurrencyForwardContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraEuroMember
106,292ck0001415311_UnrealizedDepreciationOnForeignCurrencyForwardContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraEuroMember
Total liabilities 790,559us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraEuroMember
108,295us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraEuroMember
Commitments and Contingencies      
Shareholders' equity    
Shareholders' equity 14,765,776us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraEuroMember
2,981,441us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraEuroMember
Total liabilities and shareholders' equity 15,556,335us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraEuroMember
3,089,736us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraEuroMember
Shares outstanding 950,014us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraEuroMember
150,014us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraEuroMember
Net asset value per share $ 15.5427ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraEuroMember
$ 19.8744ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraEuroMember
Market value per share $ 15.54ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraEuroMember
$ 19.80ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraEuroMember
ProShares Ultra Yen [Member]    
Assets    
Cash 435,727us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraYenMember
846,919us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraYenMember
Short-term U.S. government and agency obligations 5,210,191us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraYenMember
1,287,869us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraYenMember
Unrealized appreciation on foreign currency forward contracts   404ck0001415311_UnrealizedAppreciationOnForeignCurrencyForwardContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraYenMember
Total assets 5,645,918us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraYenMember
2,135,192us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraYenMember
Liabilities    
Management fee payable 4,659us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraYenMember
1,515us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraYenMember
Unrealized depreciation on foreign currency forward contracts 41,178ck0001415311_UnrealizedDepreciationOnForeignCurrencyForwardContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraYenMember
15,649ck0001415311_UnrealizedDepreciationOnForeignCurrencyForwardContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraYenMember
Total liabilities 45,837us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraYenMember
17,164us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraYenMember
Commitments and Contingencies      
Shareholders' equity    
Shareholders' equity 5,600,081us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraYenMember
2,118,028us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraYenMember
Total liabilities and shareholders' equity 5,645,918us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraYenMember
2,135,192us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraYenMember
Shares outstanding 400,014us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraYenMember
150,014us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraYenMember
Net asset value per share $ 13.9997ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraYenMember
$ 14.1189ck0001415311_NetAssetValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraYenMember
Market value per share $ 13.99ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraYenMember
$ 14.12ck0001415311_MarketValuePerShare
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesUltraYenMember
ProShares Trust II [Member]    
Assets    
Cash 41,200,565us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
35,899,231us-gaap_Cash
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
Segregated cash balances with brokers for futures contracts 183,239,785ck0001415311_SegregatedCashBalancesWithBrokersForFuturesContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
296,561,615ck0001415311_SegregatedCashBalancesWithBrokersForFuturesContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
Short-term U.S. government and agency obligations 3,980,228,554us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
3,005,876,580us-gaap_FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
Unrealized appreciation on swap agreements 27,134,098us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciation
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
27,585,336us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciation
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
Unrealized appreciation on forward agreements 24,281,836ck0001415311_UnrealizedAppreciationOnForwardAgreements
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
2,850,677ck0001415311_UnrealizedAppreciationOnForwardAgreements
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
Unrealized appreciation on foreign currency forward contracts 26,206,397ck0001415311_UnrealizedAppreciationOnForeignCurrencyForwardContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
19,594,239ck0001415311_UnrealizedAppreciationOnForeignCurrencyForwardContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
Receivable from capital shares sold 83,594,709ck0001415311_ReceivableForCapitalSharesSold
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
58,085,447ck0001415311_ReceivableForCapitalSharesSold
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
Receivable on open futures contracts 48,075,096us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
56,002,326us-gaap_ReceivablesFromBrokersDealersAndClearingOrganizations
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
Offering costs 33,164ck0001415311_OfferingCosts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
49,384ck0001415311_OfferingCosts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
Limitation by Sponsor 11,008ck0001415311_LimitationBySponsor
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
9,474ck0001415311_LimitationBySponsor
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
Total assets 4,414,005,212us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
3,502,514,309us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
Liabilities    
Payable for capital shares redeemed 20,823,638ck0001415311_PayableForCapitalSharesRedeemed
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
25,400,996ck0001415311_PayableForCapitalSharesRedeemed
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
Payable on open futures contracts 15,659,120us-gaap_PayablesToBrokerDealersAndClearingOrganizations
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
46,405,998us-gaap_PayablesToBrokerDealersAndClearingOrganizations
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
Management fee payable 3,382,999us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
2,657,505us-gaap_ManagementFeePayable
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
Payable for offering costs 65,785ck0001415311_PayableForOfferingCosts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
65,785ck0001415311_PayableForOfferingCosts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
Unrealized depreciation on swap agreements 78,603,652us-gaap_InvestmentOwnedUnrecognizedUnrealizedDepreciation
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
76,512,435us-gaap_InvestmentOwnedUnrecognizedUnrealizedDepreciation
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
Unrealized depreciation on forward agreements 5,318,264ck0001415311_UnrealizedDepreciationOnForwardAgreements
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
14,882,468ck0001415311_UnrealizedDepreciationOnForwardAgreements
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
Unrealized depreciation on foreign currency forward contracts 2,968,373ck0001415311_UnrealizedDepreciationOnForeignCurrencyForwardContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
4,528,636ck0001415311_UnrealizedDepreciationOnForeignCurrencyForwardContracts
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
Total liabilities 126,821,831us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
170,453,823us-gaap_Liabilities
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
Commitments and Contingencies      
Shareholders' equity    
Shareholders' equity 4,287,183,381us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
3,332,060,486us-gaap_StockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
Total liabilities and shareholders' equity $ 4,414,005,212us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
$ 3,502,514,309us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
Shares outstanding 258,357,748us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
122,157,748us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= ck0001415311_ProsharesTrustIiMember
[1] Since the Fund commenced investment operations on October 1, 2014, the Statement of Cash Flows for the three months ended March 31, 2014 has not been provided.