v2.4.1.9

Statements of Cash Flows (USD $) | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
ProShares Managed Futures Strategy [Member] |  |  |
Cash flow from operating activities |  |  |
Net income (loss) | $ 82,137 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [1],[2] |
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |
Decrease (Increase) in segregated cash balances with brokers for futures contracts | (74,111)ck0001415311_DecreaseIncreaseInSegregatedCashBalancesWithBrokersForFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [2] |
Decrease (Increase) in receivable on futures contracts | (19,568)ck0001415311_DecreaseIncreaseInReceivableOnOpenFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [2] |
Decrease (Increase) in Limitation by Sponsor | (1,534)ck0001415311_DecreaseIncreaseInLimitationBySponsor / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [2] |
Change in offering cost | 16,220 ck0001415311_DecreaseIncreaseInOfferingCosts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [2] |
Net cash provided by (used in) operating activities | 3,144 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [2] |
Cash flow from financing activities |  |  |
Proceeds from addition of shares | 4,304,676 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [2] |
Payment on shares redeemed | (2,140,103)us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [2] |
Net cash provided by (used in) financing activities | 2,164,573 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [2] |
Net increase (decrease) in cash | 2,167,717 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [2] |
Cash, beginning of period | 6,135,185 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [2] |
Cash, end of period | 8,302,902 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesManagedFuturesStrategyMember | [2] |
ProShares VIX Short-Term Futures ETF [Member] |  |  |
Cash flow from operating activities |  |  |
Net income (loss) | (20,622,523)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember |  | 27,053,653 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |
Decrease (Increase) in segregated cash balances with brokers for futures contracts | 7,419,585 ck0001415311_DecreaseIncreaseInSegregatedCashBalancesWithBrokersForFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember |  | 39,131,350 ck0001415311_DecreaseIncreaseInSegregatedCashBalancesWithBrokersForFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember
Net sale (purchase) of short-term U.S. government and agency obligations | (49,096,865)ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember |  | 113,480,989 ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember
Change in unrealized appreciation/depreciation on investments | 1,144 ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember |  | 4,584 ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember
Decrease (Increase) in receivable on futures contracts | 4,098,028 ck0001415311_DecreaseIncreaseInReceivableOnOpenFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember |  | 3,179,017 ck0001415311_DecreaseIncreaseInReceivableOnOpenFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember
Increase (Decrease) in management fee payable | 20,605 ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember |  | (122,678)ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember
Increase (Decrease) in payable on futures contracts |  |  | 3,088,786 ck0001415311_IncreaseDecreaseInPayableOnFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember
Net cash provided by (used in) operating activities | (58,180,026)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember |  | 185,815,701 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember
Cash flow from financing activities |  |  |
Proceeds from addition of shares | 84,542,261 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember |  | 42,065,649 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember
Payment on shares redeemed | (25,891,554)us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember |  | (230,347,582)us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember
Net cash provided by (used in) financing activities | 58,650,707 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember |  | (188,281,933)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember
Net increase (decrease) in cash | 470,681 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember |  | (2,466,232)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember
Cash, beginning of period | 1,694,791 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember |  | 4,333,752 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember
Cash, end of period | 2,165,472 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember |  | 1,867,520 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixShortTermFuturesEtfMember
ProShares VIX Mid-Term Futures ETF [Member] |  |  |
Cash flow from operating activities |  |  |
Net income (loss) | (697,272)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember |  | (2,617,480)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |
Decrease (Increase) in segregated cash balances with brokers for futures contracts | (227,100)ck0001415311_DecreaseIncreaseInSegregatedCashBalancesWithBrokersForFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember |  | (675,210)ck0001415311_DecreaseIncreaseInSegregatedCashBalancesWithBrokersForFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember
Net sale (purchase) of short-term U.S. government and agency obligations | (3,570,073)ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember |  | (2,655,070)ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember
Change in unrealized appreciation/depreciation on investments | 567 ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember |  | (468)ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember
Decrease (Increase) in receivable on futures contracts | 1,462,009 ck0001415311_DecreaseIncreaseInReceivableOnOpenFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember |  | 100,734 ck0001415311_DecreaseIncreaseInReceivableOnOpenFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember
Increase (Decrease) in management fee payable | (1,158)ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember |  | (3,141)ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember
Increase (Decrease) in payable on futures contracts |  |  | 1,009,664 ck0001415311_IncreaseDecreaseInPayableOnFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember
Net cash provided by (used in) operating activities | (3,033,027)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember |  | (4,840,971)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember
Cash flow from financing activities |  |  |
Proceeds from addition of shares | 12,344,563 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember |  | 21,263,524 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember
Payment on shares redeemed | (9,641,724)us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember |  | (17,309,533)us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember
Net cash provided by (used in) financing activities | 2,702,839 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember |  | 3,953,991 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember
Net increase (decrease) in cash | (330,188)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember |  | (886,980)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember
Cash, beginning of period | 1,634,082 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember |  | 1,906,397 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember
Cash, end of period | 1,303,894 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember |  | 1,019,417 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesVixMidTermFuturesEtfMember
ProShares Short VIX Short-Term Futures ETF [Member] |  |  |
Cash flow from operating activities |  |  |
Net income (loss) | 45,686,713 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember |  | 1,930,964 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |
Decrease (Increase) in segregated cash balances with brokers for futures contracts | 29,744,690 ck0001415311_DecreaseIncreaseInSegregatedCashBalancesWithBrokersForFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember |  | (11,354,850)ck0001415311_DecreaseIncreaseInSegregatedCashBalancesWithBrokersForFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
Net sale (purchase) of short-term U.S. government and agency obligations | 224,055,795 ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember |  | (63,929,582)ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
Change in unrealized appreciation/depreciation on investments | (518)ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember |  | (1,509)ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
Decrease (Increase) in receivable on futures contracts |  |  | (5,880,498)ck0001415311_DecreaseIncreaseInReceivableOnOpenFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
Increase (Decrease) in management fee payable | (120,822)ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember |  | 64,588 ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
Increase (Decrease) in payable on futures contracts | (29,594,238)ck0001415311_IncreaseDecreaseInPayableOnFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember |  |
Net cash provided by (used in) operating activities | 269,771,620 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember |  | (79,170,887)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
Cash flow from financing activities |  |  |
Proceeds from addition of shares | 118,885,967 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember |  | 162,438,045 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
Payment on shares redeemed | (393,636,613)us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember |  | (80,333,451)us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
Net cash provided by (used in) financing activities | (274,750,646)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember |  | 82,104,594 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
Net increase (decrease) in cash | (4,979,026)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember |  | 2,933,707 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
Cash, beginning of period | 9,122,219 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember |  | 2,153,370 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
Cash, end of period | 4,143,193 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember |  | 5,087,077 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
ProShares Ultra VIX Short-Term Futures ETF [Member] |  |  |
Cash flow from operating activities |  |  |
Net income (loss) | (225,649,701)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember |  | (10,320,895)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |
Decrease (Increase) in segregated cash balances with brokers for futures contracts | 43,254,330 ck0001415311_DecreaseIncreaseInSegregatedCashBalancesWithBrokersForFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember |  | (26,944,250)ck0001415311_DecreaseIncreaseInSegregatedCashBalancesWithBrokersForFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
Net sale (purchase) of short-term U.S. government and agency obligations | (387,260,864)ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember |  | (64,317,479)ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
Change in unrealized appreciation/depreciation on investments | (12)ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember |  | (2,542)ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
Decrease (Increase) in receivable on futures contracts | 5,180,769 ck0001415311_DecreaseIncreaseInReceivableOnOpenFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember |  |
Increase (Decrease) in management fee payable | 260,562 ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember |  | 44,327 ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
Increase (Decrease) in payable on futures contracts |  |  | 21,168,707 ck0001415311_IncreaseDecreaseInPayableOnFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
Net cash provided by (used in) operating activities | (564,214,916)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember |  | (80,372,132)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
Cash flow from financing activities |  |  |
Proceeds from addition of shares | 970,798,327 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember |  | 302,055,786 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
Payment on shares redeemed | (404,841,950)us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember |  | (220,376,697)us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
Net cash provided by (used in) financing activities | 565,956,377 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember |  | 81,679,089 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
Net increase (decrease) in cash | 1,741,461 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember |  | 1,306,957 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
Cash, beginning of period | 3,737,292 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember |  | 2,240,977 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
Cash, end of period | 5,478,753 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember |  | 3,547,934 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
ProShares UltraShort Bloomberg Commodity [Member] |  |  |
Cash flow from operating activities |  |  |
Net income (loss) | 553,657 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCommodityMember |  | (513,697)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCommodityMember
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |
Net sale (purchase) of short-term U.S. government and agency obligations | (757,219)ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCommodityMember |  | 967,212 ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCommodityMember
Change in unrealized appreciation/depreciation on investments | 290,574 ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCommodityMember |  | (129,989)ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCommodityMember
Increase (Decrease) in management fee payable | 685 ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCommodityMember |  | (394)ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCommodityMember
Net cash provided by (used in) operating activities | 87,697 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCommodityMember |  | 323,132 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCommodityMember
Cash flow from financing activities |  |  |
Net increase (decrease) in cash | 87,697 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCommodityMember |  | 323,132 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCommodityMember
Cash, beginning of period | 467,766 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCommodityMember |  | 374,245 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCommodityMember
Cash, end of period | 555,463 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCommodityMember |  | 697,377 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCommodityMember
ProShares UltraShort Bloomberg Crude Oil [Member] |  |  |
Cash flow from operating activities |  |  |
Net income (loss) | 45,462,935 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCrudeOilMember |  | (16,265,435)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |
Decrease (Increase) in segregated cash balances with brokers for futures contracts | (8,301,630)ck0001415311_DecreaseIncreaseInSegregatedCashBalancesWithBrokersForFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCrudeOilMember |  | (1,750,925)ck0001415311_DecreaseIncreaseInSegregatedCashBalancesWithBrokersForFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
Net sale (purchase) of short-term U.S. government and agency obligations | (188,145,656)ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCrudeOilMember |  | (40,675,851)ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
Change in unrealized appreciation/depreciation on investments | 166,871 ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCrudeOilMember |  | (1,638,091)ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
Decrease (Increase) in receivable on futures contracts | (3,528,588)ck0001415311_DecreaseIncreaseInReceivableOnOpenFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCrudeOilMember |  | 1,158,118 ck0001415311_DecreaseIncreaseInReceivableOnOpenFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
Increase (Decrease) in management fee payable | 109,424 ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCrudeOilMember |  | 58,766 ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
Net cash provided by (used in) operating activities | (154,236,644)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCrudeOilMember |  | (59,113,418)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
Cash flow from financing activities |  |  |
Proceeds from addition of shares | 372,664,934 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCrudeOilMember |  | 214,164,184 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
Payment on shares redeemed | (212,552,651)us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCrudeOilMember |  | (152,942,823)us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
Net cash provided by (used in) financing activities | 160,112,283 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCrudeOilMember |  | 61,221,361 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
Net increase (decrease) in cash | 5,875,639 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCrudeOilMember |  | 2,107,943 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
Cash, beginning of period | 994,268 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCrudeOilMember |  | 1,872,915 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
Cash, end of period | 6,869,907 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCrudeOilMember |  | 3,980,858 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergCrudeOilMember
ProShares UltraShort Bloomberg Natural Gas [Member] |  |  |
Cash flow from operating activities |  |  |
Net income (loss) | 2,056,229 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergNaturalGasMember |  | (5,929,304)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |
Decrease (Increase) in segregated cash balances with brokers for futures contracts | 2,697,794 ck0001415311_DecreaseIncreaseInSegregatedCashBalancesWithBrokersForFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergNaturalGasMember |  | (8,719,700)ck0001415311_DecreaseIncreaseInSegregatedCashBalancesWithBrokersForFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
Net sale (purchase) of short-term U.S. government and agency obligations | (306,963)ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergNaturalGasMember |  | (38,476,294)ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
Change in unrealized appreciation/depreciation on investments | 175 ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergNaturalGasMember |  | (2,243)ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
Decrease (Increase) in receivable on futures contracts | 923,531 ck0001415311_DecreaseIncreaseInReceivableOnOpenFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergNaturalGasMember |  | (1,231,947)ck0001415311_DecreaseIncreaseInReceivableOnOpenFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
Increase (Decrease) in management fee payable | (1,889)ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergNaturalGasMember |  | 54,169 ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
Increase (Decrease) in payable on futures contracts | 5,985 ck0001415311_IncreaseDecreaseInPayableOnFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergNaturalGasMember |  |
Net cash provided by (used in) operating activities | 5,374,862 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergNaturalGasMember |  | (54,305,319)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
Cash flow from financing activities |  |  |
Proceeds from addition of shares | 10,858,377 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergNaturalGasMember |  | 89,514,809 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
Payment on shares redeemed | (16,671,600)us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergNaturalGasMember |  | (32,775,728)us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
Net cash provided by (used in) financing activities | (5,813,223)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergNaturalGasMember |  | 56,739,081 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
Net increase (decrease) in cash | (438,361)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergNaturalGasMember |  | 2,433,762 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
Cash, beginning of period | 696,743 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergNaturalGasMember |  | 564,647 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
Cash, end of period | 258,382 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergNaturalGasMember |  | 2,998,409 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortBloombergNaturalGasMember
ProShares UltraShort Gold [Member] |  |  |
Cash flow from operating activities |  |  |
Net income (loss) | 2,430,175 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortGoldMember |  | (19,493,987)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortGoldMember
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |
Net sale (purchase) of short-term U.S. government and agency obligations | 4,600,652 ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortGoldMember |  | 43,151,202 ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortGoldMember
Change in unrealized appreciation/depreciation on investments | (699,461)ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortGoldMember |  | (2,902,238)ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortGoldMember
Decrease (Increase) in receivable on futures contracts | 2,868 ck0001415311_DecreaseIncreaseInReceivableOnOpenFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortGoldMember |  | (1,800)ck0001415311_DecreaseIncreaseInReceivableOnOpenFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortGoldMember
Increase (Decrease) in management fee payable | (1,228)ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortGoldMember |  | (38,574)ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortGoldMember
Net cash provided by (used in) operating activities | 6,333,006 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortGoldMember |  | 20,714,603 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortGoldMember
Cash flow from financing activities |  |  |
Proceeds from addition of shares | 8,523,330 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortGoldMember |  | 27,505,358 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortGoldMember
Payment on shares redeemed | (14,854,653)us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortGoldMember |  | (48,205,557)us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortGoldMember
Net cash provided by (used in) financing activities | (6,331,323)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortGoldMember |  | (20,700,199)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortGoldMember
Net increase (decrease) in cash | 1,683 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortGoldMember |  | 14,404 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortGoldMember
Cash, beginning of period | 162,434 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortGoldMember |  | 197,647 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortGoldMember
Cash, end of period | 164,117 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortGoldMember |  | 212,051 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortGoldMember
ProShares UltraShort Silver [Member] |  |  |
Cash flow from operating activities |  |  |
Net income (loss) | (5,809,417)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember |  | (2,843,026)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |
Decrease (Increase) in segregated cash balances with brokers for futures contracts | (2,640)ck0001415311_DecreaseIncreaseInSegregatedCashBalancesWithBrokersForFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember |  |
Net sale (purchase) of short-term U.S. government and agency obligations | 2,225,289 ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember |  | 47,636,698 ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember
Change in unrealized appreciation/depreciation on investments | 4,330,869 ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember |  | (9,969,919)ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember
Decrease (Increase) in receivable on futures contracts | 6,010 ck0001415311_DecreaseIncreaseInReceivableOnOpenFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember |  | 2,450 ck0001415311_DecreaseIncreaseInReceivableOnOpenFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember
Increase (Decrease) in management fee payable | 696 ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember |  | (31,378)ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember
Increase (Decrease) in payable on futures contracts |  |  | 440 ck0001415311_IncreaseDecreaseInPayableOnFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember
Net cash provided by (used in) operating activities | 750,807 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember |  | 34,795,265 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember
Cash flow from financing activities |  |  |
Proceeds from addition of shares | 14,996,733 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember |  | 41,391,244 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember
Payment on shares redeemed | (15,809,627)us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember |  | (76,378,197)us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember
Net cash provided by (used in) financing activities | (812,894)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember |  | (34,986,953)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember
Net increase (decrease) in cash | (62,087)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember |  | (191,688)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember
Cash, beginning of period | 207,506 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember |  | 461,167 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember
Cash, end of period | 145,419 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember |  | 269,479 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortSilverMember
ProShares Short Euro [Member] |  |  |
Cash flow from operating activities |  |  |
Net income (loss) | 1,743,368 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortEuroMember |  | (1,988)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortEuroMember
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |
Decrease (Increase) in segregated cash balances with brokers for futures contracts | (268,620)ck0001415311_DecreaseIncreaseInSegregatedCashBalancesWithBrokersForFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortEuroMember |  | 27,225 ck0001415311_DecreaseIncreaseInSegregatedCashBalancesWithBrokersForFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortEuroMember
Net sale (purchase) of short-term U.S. government and agency obligations | (5,925,419)ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortEuroMember |  | 1,674,609 ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortEuroMember
Change in unrealized appreciation/depreciation on investments | (183)ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortEuroMember |  | 190 ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortEuroMember
Decrease (Increase) in receivable on futures contracts | (78,075)ck0001415311_DecreaseIncreaseInReceivableOnOpenFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortEuroMember |  | 9,100 ck0001415311_DecreaseIncreaseInReceivableOnOpenFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortEuroMember
Increase (Decrease) in management fee payable | 4,123 ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortEuroMember |  | (1,282)ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortEuroMember
Increase (Decrease) in payable on futures contracts |  |  | 12,300 ck0001415311_IncreaseDecreaseInPayableOnFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortEuroMember
Net cash provided by (used in) operating activities | (4,524,806)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortEuroMember |  | 1,720,154 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortEuroMember
Cash flow from financing activities |  |  |
Proceeds from addition of shares | 4,418,831 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortEuroMember |  |
Payment on shares redeemed |  |  | (1,792,584)us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortEuroMember
Net cash provided by (used in) financing activities | 4,418,831 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortEuroMember |  | (1,792,584)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortEuroMember
Net increase (decrease) in cash | (105,975)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortEuroMember |  | (72,430)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortEuroMember
Cash, beginning of period | 1,640,225 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortEuroMember |  | 863,980 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortEuroMember
Cash, end of period | 1,534,250 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortEuroMember |  | 791,550 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesShortEuroMember
ProShares UltraShort Australian Dollar [Member] |  |  |
Cash flow from operating activities |  |  |
Net income (loss) | 2,600,653 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortAustralianDollarMember |  | (2,277,282)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortAustralianDollarMember
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |
Decrease (Increase) in segregated cash balances with brokers for futures contracts | 638,092 ck0001415311_DecreaseIncreaseInSegregatedCashBalancesWithBrokersForFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortAustralianDollarMember |  | 207,570 ck0001415311_DecreaseIncreaseInSegregatedCashBalancesWithBrokersForFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortAustralianDollarMember
Net sale (purchase) of short-term U.S. government and agency obligations | 3,335,295 ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortAustralianDollarMember |  | 4,970,625 ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortAustralianDollarMember
Change in unrealized appreciation/depreciation on investments | (109)ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortAustralianDollarMember |  | 415 ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortAustralianDollarMember
Decrease (Increase) in receivable on futures contracts | (119,754)ck0001415311_DecreaseIncreaseInReceivableOnOpenFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortAustralianDollarMember |  |
Increase (Decrease) in management fee payable | (2,802)ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortAustralianDollarMember |  | (2,916)ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortAustralianDollarMember
Increase (Decrease) in payable on futures contracts |  |  | 2,933 ck0001415311_IncreaseDecreaseInPayableOnFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortAustralianDollarMember
Net cash provided by (used in) operating activities | 6,451,375 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortAustralianDollarMember |  | 2,901,345 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortAustralianDollarMember
Cash flow from financing activities |  |  |
Proceeds from addition of shares | 2,764,167 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortAustralianDollarMember |  |
Payment on shares redeemed | (8,380,675)us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortAustralianDollarMember |  | (4,540,263)us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortAustralianDollarMember
Net cash provided by (used in) financing activities | (5,616,508)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortAustralianDollarMember |  | (4,540,263)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortAustralianDollarMember
Net increase (decrease) in cash | 834,867 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortAustralianDollarMember |  | (1,638,918)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortAustralianDollarMember
Cash, beginning of period | 1,788,757 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortAustralianDollarMember |  | 2,751,320 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortAustralianDollarMember
Cash, end of period | 2,623,624 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortAustralianDollarMember |  | 1,112,402 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortAustralianDollarMember
ProShares UltraShort Euro [Member] |  |  |
Cash flow from operating activities |  |  |
Net income (loss) | 112,970,253 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortEuroMember |  | (3,067,792)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortEuroMember
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |
Net sale (purchase) of short-term U.S. government and agency obligations | (62,336,046)ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortEuroMember |  | 23,525,818 ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortEuroMember
Change in unrealized appreciation/depreciation on investments | (6,631,469)ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortEuroMember |  | (10,013,710)ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortEuroMember
Increase (Decrease) in management fee payable | 51,813 ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortEuroMember |  | (17,998)ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortEuroMember
Net cash provided by (used in) operating activities | 44,054,551 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortEuroMember |  | 10,426,318 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortEuroMember
Cash flow from financing activities |  |  |
Proceeds from addition of shares | 114,034,597 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortEuroMember |  | 3,360,054 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortEuroMember
Payment on shares redeemed | (158,560,439)us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortEuroMember |  | (13,798,403)us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortEuroMember
Net cash provided by (used in) financing activities | (44,525,842)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortEuroMember |  | (10,438,349)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortEuroMember
Net increase (decrease) in cash | (471,291)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortEuroMember |  | (12,031)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortEuroMember
Cash, beginning of period | 746,454 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortEuroMember |  | 218,940 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortEuroMember
Cash, end of period | 275,163 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortEuroMember |  | 206,909 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortEuroMember
ProShares UltraShort Yen [Member] |  |  |
Cash flow from operating activities |  |  |
Net income (loss) | (3,983,909)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortYenMember |  | (25,587,106)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortYenMember
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |
Net sale (purchase) of short-term U.S. government and agency obligations | 88,858,357 ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortYenMember |  | 157,858,611 ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortYenMember
Change in unrealized appreciation/depreciation on investments | (2,237,926)ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortYenMember |  | 24,542,413 ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortYenMember
Increase (Decrease) in management fee payable | (45,873)ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortYenMember |  | (105,150)ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortYenMember
Net cash provided by (used in) operating activities | 82,590,649 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortYenMember |  | 156,708,768 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortYenMember
Cash flow from financing activities |  |  |
Proceeds from addition of shares | 58,116,062 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortYenMember |  | 9,974,148 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortYenMember
Payment on shares redeemed | (140,793,326)us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortYenMember |  | (166,857,972)us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortYenMember
Net cash provided by (used in) financing activities | (82,677,264)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortYenMember |  | (156,883,824)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortYenMember
Net increase (decrease) in cash | (86,615)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortYenMember |  | (175,056)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortYenMember
Cash, beginning of period | 532,706 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortYenMember |  | 575,108 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortYenMember
Cash, end of period | 446,091 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortYenMember |  | 400,052 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltrashortYenMember
ProShares Ultra Bloomberg Commodity [Member] |  |  |
Cash flow from operating activities |  |  |
Net income (loss) | (324,012)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCommodityMember |  | 401,270 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCommodityMember
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |
Net sale (purchase) of short-term U.S. government and agency obligations | 512,138 ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCommodityMember |  | 405,883 ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCommodityMember
Change in unrealized appreciation/depreciation on investments | (201,952)ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCommodityMember |  | 129,115 ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCommodityMember
Increase (Decrease) in management fee payable | (415)ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCommodityMember |  | 309 ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCommodityMember
Net cash provided by (used in) operating activities | (14,241)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCommodityMember |  | 936,577 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCommodityMember
Cash flow from financing activities |  |  |
Net increase (decrease) in cash | (14,241)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCommodityMember |  | 936,577 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCommodityMember
Cash, beginning of period | 185,684 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCommodityMember |  | 85,642 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCommodityMember
Cash, end of period | 171,443 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCommodityMember |  | 1,022,219 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCommodityMember
ProShares Ultra Bloomberg Crude Oil [Member] |  |  |
Cash flow from operating activities |  |  |
Net income (loss) | (195,164,283)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCrudeOilMember |  | 21,342,810 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCrudeOilMember
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |
Decrease (Increase) in segregated cash balances with brokers for futures contracts | 21,184,809 ck0001415311_DecreaseIncreaseInSegregatedCashBalancesWithBrokersForFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCrudeOilMember |  | 896,115 ck0001415311_DecreaseIncreaseInSegregatedCashBalancesWithBrokersForFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCrudeOilMember
Net sale (purchase) of short-term U.S. government and agency obligations | (598,912,305)ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCrudeOilMember |  | 25,373,056 ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCrudeOilMember
Change in unrealized appreciation/depreciation on investments | 2,291,994 ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCrudeOilMember |  | 1,006,506 ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCrudeOilMember
Decrease (Increase) in receivable on futures contracts |  |  | (121,862)ck0001415311_DecreaseIncreaseInReceivableOnOpenFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCrudeOilMember
Increase (Decrease) in management fee payable | 469,641 ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCrudeOilMember |  | (46,160)ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCrudeOilMember
Increase (Decrease) in payable on futures contracts | 8,223,488 ck0001415311_IncreaseDecreaseInPayableOnFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCrudeOilMember |  | (997,210)ck0001415311_IncreaseDecreaseInPayableOnFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCrudeOilMember
Net cash provided by (used in) operating activities | (761,906,656)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCrudeOilMember |  | 47,453,255 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCrudeOilMember
Cash flow from financing activities |  |  |
Proceeds from addition of shares | 1,033,639,301 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCrudeOilMember |  | 127,214,584 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCrudeOilMember
Payment on shares redeemed | (269,057,623)us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCrudeOilMember |  | (173,675,237)us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCrudeOilMember
Net cash provided by (used in) financing activities | 764,581,678 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCrudeOilMember |  | (46,460,653)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCrudeOilMember
Net increase (decrease) in cash | 2,675,022 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCrudeOilMember |  | 992,602 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCrudeOilMember
Cash, beginning of period | 2,349,384 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCrudeOilMember |  | 689,596 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCrudeOilMember
Cash, end of period | 5,024,406 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCrudeOilMember |  | 1,682,198 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergCrudeOilMember
ProShares Ultra Bloomberg Natural Gas [Member] |  |  |
Cash flow from operating activities |  |  |
Net income (loss) | (18,588,424)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergNaturalGasMember |  | 18,491,246 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergNaturalGasMember
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |
Decrease (Increase) in segregated cash balances with brokers for futures contracts | 17,291,600 ck0001415311_DecreaseIncreaseInSegregatedCashBalancesWithBrokersForFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergNaturalGasMember |  | 3,397,900 ck0001415311_DecreaseIncreaseInSegregatedCashBalancesWithBrokersForFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergNaturalGasMember
Net sale (purchase) of short-term U.S. government and agency obligations | (3,760,303)ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergNaturalGasMember |  | 40,640,631 ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergNaturalGasMember
Change in unrealized appreciation/depreciation on investments | 689 ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergNaturalGasMember |  | 2,402 ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergNaturalGasMember
Increase (Decrease) in management fee payable | (10,942)ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergNaturalGasMember |  | (58,040)ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergNaturalGasMember
Increase (Decrease) in payable on futures contracts | (9,388,126)ck0001415311_IncreaseDecreaseInPayableOnFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergNaturalGasMember |  | (4,578,015)ck0001415311_IncreaseDecreaseInPayableOnFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergNaturalGasMember
Net cash provided by (used in) operating activities | (14,455,506)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergNaturalGasMember |  | 57,896,124 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergNaturalGasMember
Cash flow from financing activities |  |  |
Proceeds from addition of shares | 31,430,074 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergNaturalGasMember |  | 9,133,238 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergNaturalGasMember
Payment on shares redeemed | (18,115,142)us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergNaturalGasMember |  | (69,328,413)us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergNaturalGasMember
Net cash provided by (used in) financing activities | 13,314,932 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergNaturalGasMember |  | (60,195,175)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergNaturalGasMember
Net increase (decrease) in cash | (1,140,574)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergNaturalGasMember |  | (2,299,051)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergNaturalGasMember
Cash, beginning of period | 1,653,582 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergNaturalGasMember |  | 3,102,827 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergNaturalGasMember
Cash, end of period | 513,008 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergNaturalGasMember |  | 803,776 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraBloombergNaturalGasMember
ProShares Ultra Gold [Member] |  |  |
Cash flow from operating activities |  |  |
Net income (loss) | (3,601,964)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraGoldMember |  | 17,925,978 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraGoldMember
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |
Net sale (purchase) of short-term U.S. government and agency obligations | 7,693,644 ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraGoldMember |  | (7,448,937)ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraGoldMember
Change in unrealized appreciation/depreciation on investments | 389,813 ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraGoldMember |  | 5,187,733 ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraGoldMember
Increase (Decrease) in management fee payable | (8,971)ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraGoldMember |  | 8,545 ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraGoldMember
Increase (Decrease) in payable on futures contracts | (2,840)ck0001415311_IncreaseDecreaseInPayableOnFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraGoldMember |  | 1,900 ck0001415311_IncreaseDecreaseInPayableOnFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraGoldMember
Net cash provided by (used in) operating activities | 4,469,682 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraGoldMember |  | 15,675,219 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraGoldMember
Cash flow from financing activities |  |  |
Proceeds from addition of shares | 2,093,762 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraGoldMember |  | 4,708,180 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraGoldMember
Payment on shares redeemed | (6,545,401)us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraGoldMember |  | (20,378,685)us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraGoldMember
Net cash provided by (used in) financing activities | (4,451,639)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraGoldMember |  | (15,670,505)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraGoldMember
Net increase (decrease) in cash | 18,043 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraGoldMember |  | 4,714 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraGoldMember
Cash, beginning of period | 104,145 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraGoldMember |  | 142,566 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraGoldMember
Cash, end of period | 122,188 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraGoldMember |  | 147,280 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraGoldMember
ProShares Ultra Silver [Member] |  |  |
Cash flow from operating activities |  |  |
Net income (loss) | 16,550,946 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraSilverMember |  | 17,192,792 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraSilverMember
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |
Decrease (Increase) in segregated cash balances with brokers for futures contracts | (2,640)ck0001415311_DecreaseIncreaseInSegregatedCashBalancesWithBrokersForFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraSilverMember |  |
Net sale (purchase) of short-term U.S. government and agency obligations | 10,973,485 ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraSilverMember |  | (62,836,134)ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraSilverMember
Change in unrealized appreciation/depreciation on investments | (35,016,895)ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraSilverMember |  | 55,649,409 ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraSilverMember
Increase (Decrease) in management fee payable | (8,608)ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraSilverMember |  | 37,130 ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraSilverMember
Increase (Decrease) in payable on futures contracts | (6,010)ck0001415311_IncreaseDecreaseInPayableOnFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraSilverMember |  | (2,070)ck0001415311_IncreaseDecreaseInPayableOnFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraSilverMember
Net cash provided by (used in) operating activities | (7,509,722)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraSilverMember |  | 10,041,127 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraSilverMember
Cash flow from financing activities |  |  |
Proceeds from addition of shares | 28,733,984 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraSilverMember |  | 43,273,004 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraSilverMember
Payment on shares redeemed | (21,239,648)us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraSilverMember |  | (53,246,602)us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraSilverMember
Net cash provided by (used in) financing activities | 7,494,336 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraSilverMember |  | (9,973,598)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraSilverMember
Net increase (decrease) in cash | (15,386)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraSilverMember |  | 67,529 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraSilverMember
Cash, beginning of period | 305,004 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraSilverMember |  | 463,001 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraSilverMember
Cash, end of period | 289,618 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraSilverMember |  | 530,530 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraSilverMember
ProShares Ultra Australian Dollar [Member] |  |  |
Cash flow from operating activities |  |  |
Net income (loss) | (342,891)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraAustralianDollarMember |  | 276,371 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraAustralianDollarMember
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |
Decrease (Increase) in segregated cash balances with brokers for futures contracts | (32,329)ck0001415311_DecreaseIncreaseInSegregatedCashBalancesWithBrokersForFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraAustralianDollarMember |  | (23,760)ck0001415311_DecreaseIncreaseInSegregatedCashBalancesWithBrokersForFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraAustralianDollarMember
Net sale (purchase) of short-term U.S. government and agency obligations | 203,753 ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraAustralianDollarMember |  | (59,530)ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraAustralianDollarMember
Change in unrealized appreciation/depreciation on investments | 12 ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraAustralianDollarMember |  | 77 ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraAustralianDollarMember
Decrease (Increase) in receivable on futures contracts |  |  | (2,853)ck0001415311_DecreaseIncreaseInReceivableOnOpenFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraAustralianDollarMember
Increase (Decrease) in management fee payable | (252)ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraAustralianDollarMember |  | 69 ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraAustralianDollarMember
Increase (Decrease) in payable on futures contracts | 14,863 ck0001415311_IncreaseDecreaseInPayableOnFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraAustralianDollarMember |  |
Net cash provided by (used in) operating activities | (156,844)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraAustralianDollarMember |  | 190,374 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraAustralianDollarMember
Cash flow from financing activities |  |  |
Net increase (decrease) in cash | (156,844)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraAustralianDollarMember |  | 190,374 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraAustralianDollarMember
Cash, beginning of period | 222,968 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraAustralianDollarMember |  | 314,796 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraAustralianDollarMember
Cash, end of period | 66,124 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraAustralianDollarMember |  | 505,170 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraAustralianDollarMember
ProShares Ultra Euro [Member] |  |  |
Cash flow from operating activities |  |  |
Net income (loss) | (1,756,235)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraEuroMember |  | (545)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraEuroMember
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |
Net sale (purchase) of short-term U.S. government and agency obligations | (12,827,127)ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraEuroMember |  | 148,087 ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraEuroMember
Change in unrealized appreciation/depreciation on investments | 675,335 ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraEuroMember |  | 80,017 ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraEuroMember
Increase (Decrease) in management fee payable | 7,761 ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraEuroMember |  | (604)ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraEuroMember
Net cash provided by (used in) operating activities | (13,900,266)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraEuroMember |  | 226,955 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraEuroMember
Cash flow from financing activities |  |  |
Proceeds from addition of shares | 13,540,570 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraEuroMember |  |
Net cash provided by (used in) financing activities | 13,540,570 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraEuroMember |  |
Net increase (decrease) in cash | (359,696)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraEuroMember |  | 226,955 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraEuroMember
Cash, beginning of period | 671,117 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraEuroMember |  | 49,723 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraEuroMember
Cash, end of period | 311,421 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraEuroMember |  | 276,678 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraEuroMember
ProShares Ultra Yen [Member] |  |  |
Cash flow from operating activities |  |  |
Net income (loss) | (115,843)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraYenMember |  | 101,117 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraYenMember
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |
Net sale (purchase) of short-term U.S. government and agency obligations | (3,922,516)ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraYenMember |  | 456,603 ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraYenMember
Change in unrealized appreciation/depreciation on investments | 26,127 ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraYenMember |  | (117,978)ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraYenMember
Increase (Decrease) in management fee payable | 3,144 ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraYenMember |  | 46 ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraYenMember
Net cash provided by (used in) operating activities | (4,009,088)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraYenMember |  | 439,788 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraYenMember
Cash flow from financing activities |  |  |
Proceeds from addition of shares | 4,285,016 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraYenMember |  |
Payment on shares redeemed | (687,120)us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraYenMember |  |
Net cash provided by (used in) financing activities | 3,597,896 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraYenMember |  |
Net increase (decrease) in cash | (411,192)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraYenMember |  | 439,788 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraYenMember
Cash, beginning of period | 846,919 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraYenMember |  | 28,116 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraYenMember
Cash, end of period | 435,727 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraYenMember |  | 467,904 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesUltraYenMember
ProShares Trust II [Member] |  |  |
Cash flow from operating activities |  |  |
Net income (loss) | (246,519,408)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesTrustIiMember |  | 15,797,664 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesTrustIiMember
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |
Decrease (Increase) in segregated cash balances with brokers for futures contracts | 113,321,830 ck0001415311_DecreaseIncreaseInSegregatedCashBalancesWithBrokersForFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesTrustIiMember |  | (5,808,535)ck0001415311_DecreaseIncreaseInSegregatedCashBalancesWithBrokersForFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesTrustIiMember
Net sale (purchase) of short-term U.S. government and agency obligations | (974,362,948)ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesTrustIiMember |  | 179,891,147 ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesTrustIiMember
Change in unrealized appreciation/depreciation on investments | (36,614,355)ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesTrustIiMember |  | 61,824,174 ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesTrustIiMember
Decrease (Increase) in receivable on futures contracts | 7,927,230 ck0001415311_DecreaseIncreaseInReceivableOnOpenFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesTrustIiMember |  | (2,789,541)ck0001415311_DecreaseIncreaseInReceivableOnOpenFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesTrustIiMember
Decrease (Increase) in Limitation by Sponsor | (1,534)ck0001415311_DecreaseIncreaseInLimitationBySponsor / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesTrustIiMember |  |
Change in offering cost | 16,220 ck0001415311_DecreaseIncreaseInOfferingCosts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesTrustIiMember |  |
Increase (Decrease) in management fee payable | 725,494 ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesTrustIiMember |  | (160,366)ck0001415311_IncreaseDecreaseInManagementFeePayable / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesTrustIiMember
Increase (Decrease) in payable on futures contracts | (30,746,878)ck0001415311_IncreaseDecreaseInPayableOnFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesTrustIiMember |  | 19,707,435 ck0001415311_IncreaseDecreaseInPayableOnFuturesContracts / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesTrustIiMember
Net cash provided by (used in) operating activities | (1,166,254,349)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesTrustIiMember |  | 268,461,978 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesTrustIiMember
Cash flow from financing activities |  |  |
Proceeds from addition of shares | 2,890,975,532 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesTrustIiMember |  | 1,098,061,807 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesTrustIiMember
Payment on shares redeemed | (1,719,419,849)us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesTrustIiMember |  | (1,362,287,727)us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesTrustIiMember
Net cash provided by (used in) financing activities | 1,171,555,683 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesTrustIiMember |  | (264,225,920)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesTrustIiMember
Net increase (decrease) in cash | 5,301,334 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesTrustIiMember |  | 4,236,058 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesTrustIiMember
Cash, beginning of period | 35,899,231 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesTrustIiMember |  | 23,390,732 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesTrustIiMember
Cash, end of period | $ 41,200,565 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesTrustIiMember |  | $ 27,626,790 us-gaap_Cash / us-gaap_StatementBusinessSegmentsAxis = ck0001415311_ProsharesTrustIiMember
[1] | Since the Fund commenced investment operations on October 1, 2014, the Statement of Operations for the three months ended March 31, 2014 has not been provided.
[2] | 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.

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