v3.21.1

Schedule of Investments - Short-Term U.S. Government and Agency Obligations (Parenthetical) (Detail) - U.S. Government Agencies Short-term Debt Securities [Member] - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Schedule of Investments [Line Items] |  |
Total short-term U.S. government and agency obligations, cost | $ 2,026,810,504 | $ 1,034,967,523
ProShares Short Euro [Member] |  |
Schedule of Investments [Line Items] |  |
Short-term U.S. government and agency obligations percentage of shareholders' equity | 46.00% |
Total short-term U.S. government and agency obligations, cost | $ 999,885 |
ProShares Short Euro [Member] | U.S. Treasury Bills 0.086% due 05/20/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.086% |
Discount rate at the time of purchase | true |
Investment, maturity date | May 20, 2021 |
ProShares Short VIX Short-Term Futures ETF [Member] |  |
Schedule of Investments [Line Items] |  |
Short-term U.S. government and agency obligations percentage of shareholders' equity | 17.00% |
Total short-term U.S. government and agency obligations, cost | $ 91,994,322 | 69,998,727
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.086% due 05/20/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.086% |
Discount rate at the time of purchase | true |
Investment, maturity date | May 20, 2021 |
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.041% due 06/17/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.041% |
Discount rate at the time of purchase | true |
Investment, maturity date | Jun. 17, 2021 |
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.075% due 04/15/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.075% |
Discount rate at the time of purchase | true |
Investment, maturity date | Apr. 15, 2021 |
ProShares Ultra Bloomberg Crude Oil [Member] |  |
Schedule of Investments [Line Items] |  |
Short-term U.S. government and agency obligations percentage of shareholders' equity | 63.00% |
Total short-term U.S. government and agency obligations, cost | $ 689,932,775 | 219,996,153
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.060% due 04/15/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.06% |
Discount rate at the time of purchase | true |
Investment, maturity date | Apr. 15, 2021 |
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.048% due 05/20/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.048% |
Discount rate at the time of purchase | true |
Investment, maturity date | May 20, 2021 |
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.045% due 06/17/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.045% |
Discount rate at the time of purchase | true |
Investment, maturity date | Jun. 17, 2021 |
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.061% due 07/15/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.061% |
Discount rate at the time of purchase | true |
Investment, maturity date | Jul. 15, 2021 |
ProShares Ultra Bloomberg Natural Gas [Member] |  |
Schedule of Investments [Line Items] |  |
Short-term U.S. government and agency obligations percentage of shareholders' equity | 46.00% |
Total short-term U.S. government and agency obligations, cost | $ 33,996,891 | 29,999,585
ProShares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.041% due 04/15/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.041% |
Discount rate at the time of purchase | true |
Investment, maturity date | Apr. 15, 2021 |
ProShares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.076% due 05/20/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.076% |
Discount rate at the time of purchase | true |
Investment, maturity date | May 20, 2021 |
ProShares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.040% due 06/17/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.04% |
Discount rate at the time of purchase | true |
Investment, maturity date | Jun. 17, 2021 |
ProShares Ultra Euro [Member] |  |
Schedule of Investments [Line Items] |  |
Short-term U.S. government and agency obligations percentage of shareholders' equity | 28.00% |
Total short-term U.S. government and agency obligations, cost | $ 999,885 |
ProShares Ultra Euro [Member] | U.S. Treasury Bills 0.086% due 05/20/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.086% |
Discount rate at the time of purchase | true |
Investment, maturity date | May 20, 2021 |
ProShares Ultra Gold [Member] |  |
Schedule of Investments [Line Items] |  |
Short-term U.S. government and agency obligations percentage of shareholders' equity | 41.00% |
Total short-term U.S. government and agency obligations, cost | $ 86,995,913 | 74,998,283
ProShares Ultra Gold [Member] | U.S. Treasury Bills 0.069% due 04/15/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.069% |
Discount rate at the time of purchase | true |
Investment, maturity date | Apr. 15, 2021 |
ProShares Ultra Gold [Member] | U.S. Treasury Bills 0.070% due 05/20/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.07% |
Discount rate at the time of purchase | true |
Investment, maturity date | May 20, 2021 |
ProShares Ultra Gold [Member] | U.S. Treasury Bills 0.037% due 06/17/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.037% |
Discount rate at the time of purchase | true |
Investment, maturity date | Jun. 17, 2021 |
ProShares Ultra Silver [Member] |  |
Schedule of Investments [Line Items] |  |
Short-term U.S. government and agency obligations percentage of shareholders' equity | 73.00% |
Total short-term U.S. government and agency obligations, cost | $ 419,957,178 | 244,987,251
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.062% due 04/15/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.062% |
Discount rate at the time of purchase | true |
Investment, maturity date | Apr. 15, 2021 |
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.051% due 05/20/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.051% |
Discount rate at the time of purchase | true |
Investment, maturity date | May 20, 2021 |
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.057% due 06/17/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.057% |
Discount rate at the time of purchase | true |
Investment, maturity date | Jun. 17, 2021 |
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.056% due 07/15/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.056% |
Discount rate at the time of purchase | true |
Investment, maturity date | Jul. 15, 2021 |
ProShares Ultra VIX Short-Term Futures ETF [Member] |  |
Schedule of Investments [Line Items] |  |
Short-term U.S. government and agency obligations percentage of shareholders' equity | 29.00% |
Total short-term U.S. government and agency obligations, cost | $ 376,960,550 | 244,990,791
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.061% due 05/20/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.061% |
Discount rate at the time of purchase | true |
Investment, maturity date | May 20, 2021 |
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.063% due 04/15/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.063% |
Discount rate at the time of purchase | true |
Investment, maturity date | Apr. 15, 2021 |
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.051% due 07/15/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.051% |
Discount rate at the time of purchase | true |
Investment, maturity date | Jul. 15, 2021 |
ProShares Ultra Yen [Member] |  |
Schedule of Investments [Line Items] |  |
Short-term U.S. government and agency obligations percentage of shareholders' equity | 19.00% |
Total short-term U.S. government and agency obligations, cost | $ 499,942 |
ProShares Ultra Yen [Member] | U.S. Treasury Bills 0.086% due 05/20/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.086% |
Discount rate at the time of purchase | true |
Investment, maturity date | May 20, 2021 |
ProShares UltraShort Bloomberg Crude Oil [Member] |  |
Schedule of Investments [Line Items] |  |
Short-term U.S. government and agency obligations percentage of shareholders' equity | 38.00% |
Total short-term U.S. government and agency obligations, cost | $ 34,996,872 |
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.041% due 04/15/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.041% |
Discount rate at the time of purchase | true |
Investment, maturity date | Apr. 15, 2021 |
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.086% due 05/20/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.086% |
Discount rate at the time of purchase | true |
Investment, maturity date | May 20, 2021 |
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.042% due 06/17/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.042% |
Discount rate at the time of purchase | true |
Investment, maturity date | Jun. 17, 2021 |
ProShares UltraShort Bloomberg Natural Gas [Member] |  |
Schedule of Investments [Line Items] |  |
Short-term U.S. government and agency obligations percentage of shareholders' equity | 63.00% |
Total short-term U.S. government and agency obligations, cost | $ 43,997,035 | 9,999,612
ProShares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.041% due 04/15/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.041% |
Discount rate at the time of purchase | true |
Investment, maturity date | Apr. 15, 2021 |
ProShares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.047% due 05/20/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.047% |
Discount rate at the time of purchase | true |
Investment, maturity date | May 20, 2021 |
ProShares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.040% due 06/17/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.04% |
Discount rate at the time of purchase | true |
Investment, maturity date | Jun. 17, 2021 |
ProShares UltraShort Euro [Member] |  |
Schedule of Investments [Line Items] |  |
Short-term U.S. government and agency obligations percentage of shareholders' equity | 33.00% |
Total short-term U.S. government and agency obligations, cost | $ 17,998,447 | 9,999,612
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.041% due 04/15/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.041% |
Discount rate at the time of purchase | true |
Investment, maturity date | Apr. 15, 2021 |
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.086% due 05/20/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.086% |
Discount rate at the time of purchase | true |
Investment, maturity date | May 20, 2021 |
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.041% due 06/17/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.041% |
Discount rate at the time of purchase | true |
Investment, maturity date | Jun. 17, 2021 |
ProShares UltraShort Gold [Member] |  |
Schedule of Investments [Line Items] |  |
Short-term U.S. government and agency obligations percentage of shareholders' equity | 32.00% |
Total short-term U.S. government and agency obligations, cost | $ 12,998,786 |
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.086% due 05/20/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.086% |
Discount rate at the time of purchase | true |
Investment, maturity date | May 20, 2021 |
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.041% due 06/17/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.041% |
Discount rate at the time of purchase | true |
Investment, maturity date | Jun. 17, 2021 |
ProShares UltraShort Silver [Member] |  |
Schedule of Investments [Line Items] |  |
Short-term U.S. government and agency obligations percentage of shareholders' equity | 33.00% |
Total short-term U.S. government and agency obligations, cost | $ 14,998,873 |
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.041% due 04/15/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.041% |
Discount rate at the time of purchase | true |
Investment, maturity date | Apr. 15, 2021 |
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.044% due 06/17/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.044% |
Discount rate at the time of purchase | true |
Investment, maturity date | Jun. 17, 2021 |
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.061% due 05/20/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.061% |
Discount rate at the time of purchase | true |
Investment, maturity date | May 20, 2021 |
ProShares UltraShort Yen [Member] |  |
Schedule of Investments [Line Items] |  |
Short-term U.S. government and agency obligations percentage of shareholders' equity | 42.00% |
Total short-term U.S. government and agency obligations, cost | $ 14,498,781 |
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.041% due 04/15/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.041% |
Discount rate at the time of purchase | true |
Investment, maturity date | Apr. 15, 2021 |
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.086% due 05/20/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.086% |
Discount rate at the time of purchase | true |
Investment, maturity date | May 20, 2021 |
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.044% due 06/17/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.044% |
Discount rate at the time of purchase | true |
Investment, maturity date | Jun. 17, 2021 |
ProShares VIX Mid-Term Futures ETF [Member] |  |
Schedule of Investments [Line Items] |  |
Short-term U.S. government and agency obligations percentage of shareholders' equity | 43.00% |
Total short-term U.S. government and agency obligations, cost | $ 31,997,344 | 44,999,073
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.041% due 04/15/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.041% |
Discount rate at the time of purchase | true |
Investment, maturity date | Apr. 15, 2021 |
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.086% due 05/20/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.086% |
Discount rate at the time of purchase | true |
Investment, maturity date | May 20, 2021 |
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.040% due 06/17/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.04% |
Discount rate at the time of purchase | true |
Investment, maturity date | Jun. 17, 2021 |
ProShares VIX Short-Term Futures ETF [Member] |  |
Schedule of Investments [Line Items] |  |
Short-term U.S. government and agency obligations percentage of shareholders' equity | 44.00% |
Total short-term U.S. government and agency obligations, cost | $ 152,987,025 | $ 84,998,436
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.086% due 05/20/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.086% |
Discount rate at the time of purchase | true |
Investment, maturity date | May 20, 2021 |
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.067% due 04/15/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.067% |
Discount rate at the time of purchase | true |
Investment, maturity date | Apr. 15, 2021 |
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.040% due 06/17/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.04% |
Discount rate at the time of purchase | true |
Investment, maturity date | Jun. 17, 2021 |
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.075% due 07/15/21 [Member] |  |
Schedule of Investments [Line Items] |  |
Interest rate | 0.075% |
Discount rate at the time of purchase | true |
Investment, maturity date | Jul. 15, 2021 |

X
- Definition Investment interest rate is discount rate on purchase flag. + References No definition available. + Details
Name: | ck0001415311_InvestmentInterestRateIsDiscountRateOnPurchaseFlag
Namespace Prefix: | ck0001415311_
Data Type: | xbrli:booleanItemType
Balance Type: | na
Period Type: | duration

X
- Definition Rate of interest on investment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
Name: | us-gaap_InvestmentInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Maturity date of investment, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
Name: | us-gaap_InvestmentMaturityDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | instant

X
- Definition Cost of the investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99383244&loc=d3e12121-115841 + Details
Name: | us-gaap_InvestmentOwnedAtCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Percent of net assets at close of period. For schedules of investments that are categorized, each category has a percent of net assets for the aggregated value of the Investments in the category. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column D)) -URI http://asc.fasb.org/extlink&oid=120401592&loc=d3e611197-123010 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99383244&loc=d3e12121-115841 + Details
Name: | us-gaap_InvestmentOwnedPercentOfNetAssets
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ScheduleOfInvestmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_USGovernmentAgenciesShorttermDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesShortEuroMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ck0001415311_InvestmentsHoldingAxis=ck0001415311_UnitedStatesTreasuryBillsZeroPointZeroEightSixPercentageDueTwentiethMayTwoThousandAndTwentyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesShortVixShortTermFuturesEtfMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ck0001415311_InvestmentsHoldingAxis=ck0001415311_UnitedStatesTreasuryBillsZeroPointZeroFourOnePercentageDueSeventeenthJuneTwoThousandAndTwentyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ck0001415311_InvestmentsHoldingAxis=ck0001415311_UnitedStatesTreasuryBillsZeroPointZeroSevenFivePercentageDueFifteenthAprilTwoThousandAndTwentyOnememberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesUltraBloombergCrudeOilMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ck0001415311_InvestmentsHoldingAxis=ck0001415311_UnitedStatesTreasuryBillsZeroPointZeroSixZeroPercentDueFifteenthAprilTwoThousandAndTwentyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ck0001415311_InvestmentsHoldingAxis=ck0001415311_UnitedStatesTreasuryBillsZeroPointZeroFourEightPercentageDueTwentiethMayTwoThousandAndTwentyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ck0001415311_InvestmentsHoldingAxis=ck0001415311_UnitedStatesTreasuryBillsZeroPointZeroFourFivePercentageDueSeventeenthJuneTwoThousandAndTwentyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ck0001415311_InvestmentsHoldingAxis=ck0001415311_UnitedStatesTreasuryBillsZeroPointZeroSixOnePercentageDueFifteenthJulyTwoThousandAndTwentyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesUltraBloombergNaturalGasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ck0001415311_InvestmentsHoldingAxis=ck0001415311_UnitedStatesTreasuryBillsZeroPointZeroFourOnePercentDueFifteenthAprilTwoThousandAndTwentyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ck0001415311_InvestmentsHoldingAxis=ck0001415311_UnitedStatesTreasuryBillsZeroPointZeroSevenSixPercentageDueTwentiethMayTwoThousandAndTwentyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ck0001415311_InvestmentsHoldingAxis=ck0001415311_UnitedStatesTreasuryBillsZeroPointZeroFourZeroPercentDueSeventeenthJuneTwoThousandAndTwentyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesUltraEuroMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesUltraGoldMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ck0001415311_InvestmentsHoldingAxis=ck0001415311_UnitedStatesTreasuryBillsZeroPointZeroSixNinePercentDueFifteenthAprilTwoThousandAndTwentyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ck0001415311_InvestmentsHoldingAxis=ck0001415311_UnitedStatesTreasuryBillsZeroPointZeroSevenZeroPercentDueTwentiethMayTwoThousandAndTwentyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ck0001415311_InvestmentsHoldingAxis=ck0001415311_UnitedStatesTreasuryBillsZeroPointZeroThreeSevenPercentDueSeventeenthJuneTwoThousandAndTwentyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesUltraSilverMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ck0001415311_InvestmentsHoldingAxis=ck0001415311_UnitedStatesTreasuryBillsZeoPointZeroSixTwoPercentageDueFifteenthAprilTwoThousandAndTwentyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ck0001415311_InvestmentsHoldingAxis=ck0001415311_UnitedStatesTreasuryBillsZeroPointZeroFiveOnePercentageDueTwentiethMayTwoThousandAndTwentyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ck0001415311_InvestmentsHoldingAxis=ck0001415311_UnitedStatesTreasuryBillsZeroFiveSevenPercentageDueSeventeenthJuneTwoThousandAndTwentyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ck0001415311_InvestmentsHoldingAxis=ck0001415311_UnitedStatesTreasuryBillsZeroPointZeroFiveSixPercentageDueFifteenthJulyTwoThousandAndTwentyOnememberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesUltraVixShortTermFuturesEtfMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ck0001415311_InvestmentsHoldingAxis=ck0001415311_UnitedStatesTreasuryBillsZeroPointZeroSixOnePercentageDueTwentyMayTwoThousandAndTwentyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ck0001415311_InvestmentsHoldingAxis=ck0001415311_UnitedStatesTreasuryBillsZeroPointZeroSixThreePercentDueFifteenthAprilTwoThousandAndTwentyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ck0001415311_InvestmentsHoldingAxis=ck0001415311_UnitedStatesTreasuryBillsZeroPointZeroFiveOnePercentageDueFifteenthJulyTwoThousandAndTwentyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesUltraYenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesUltraShortBloombergCrudeOilMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ck0001415311_InvestmentsHoldingAxis=ck0001415311_UnitedStatesTreasuryBillsZeroPointZeroFourTwoPercentageDueJuneSeventeenThTwoThousandAndTwentyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesUltraShortBloombergNaturalGasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ck0001415311_InvestmentsHoldingAxis=ck0001415311_UnitedStatesTreasuryBillsZeroPointZeroFourSevenPercentDueMayTwentiethTwoThousandAndTwentyOneMemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesUltraShortEuroMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesUltraShortGoldMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesUltraShortSilverMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ck0001415311_InvestmentsHoldingAxis=ck0001415311_UnitedStatesTreasuryBillsZeroPointZeroFourFourPercentageDueSeventeenthJuneTwoThousandAndTwentyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesUltraShortYenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesVixMidTermFuturesEtfMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesVixShortTermFuturesEtfMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ck0001415311_InvestmentsHoldingAxis=ck0001415311_UnitedStatesTreasuryBillsZeroPointZeroSixSevenPercentageDueFifteenthAprilTwoThousandAndTwentyOneMembermemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ck0001415311_InvestmentsHoldingAxis=ck0001415311_UnitedStatesTreasuryBillsZeroPointZeroSevenFivePercentageDueFifteenthJulyTwoThousandAndTwentyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |