v3.8.0.1

Investments - Gross Amounts Not Offset in Statements of Financial Condition (Detail) - USD ($) | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
ProShares UltraShort Euro [Member] | Goldman Sachs International [Member] |  |
Derivative [Line Items] |  |
Amounts of Recognized Assets presented in the Statements of Financial Condition | $ 2,034,015 | $ 8,109,067
Financial Instruments for the Benefit of (the Funds) / the Counterparties | (2,034,015) | (8,109,067)
ProShares UltraShort Euro [Member] | UBS AG [Member] |  |
Derivative [Line Items] |  |
Amounts of Recognized Assets presented in the Statements of Financial Condition | 1,865,678 | 8,053,864
Cash Collateral for the Benefit of (the Funds) / the Counterparties | (1,865,678) | (8,053,864)
ProShares Ultra Bloomberg Crude Oil [Member] | Citibank N.A. [Member] |  |
Derivative [Line Items] |  |
Amounts of Recognized Assets presented in the Statements of Financial Condition | 13,855,515 | 18,427,009
Net Amounts of Assets presented in the Statements of Financial Condition | 13,855,515 | 18,427,009
ProShares Ultra Bloomberg Crude Oil [Member] | Goldman Sachs International [Member] |  |
Derivative [Line Items] |  |
Amounts of Recognized Assets presented in the Statements of Financial Condition | 11,965,958 | 14,016,906
Financial Instruments for the Benefit of (the Funds) / the Counterparties | (11,930,988) | (14,016,906)
Net Amounts of Assets presented in the Statements of Financial Condition | 34,970 |
ProShares Ultra Bloomberg Crude Oil [Member] | Societe Generale S.A. [Member] |  |
Derivative [Line Items] |  |
Amounts of Recognized Assets presented in the Statements of Financial Condition | 4,548,744 | 8,661,821
Financial Instruments for the Benefit of (the Funds) / the Counterparties | (4,548,744) | (8,661,821)
ProShares Ultra Bloomberg Crude Oil [Member] | UBS AG [Member] |  |
Derivative [Line Items] |  |
Amounts of Recognized Assets presented in the Statements of Financial Condition | 10,426,683 | 14,252,835
Cash Collateral for the Benefit of (the Funds) / the Counterparties | (9,900,000) | (14,252,835)
Net Amounts of Assets presented in the Statements of Financial Condition | 526,683 |
ProShares UltraShort Bloomberg Crude Oil [Member] | Citibank N.A. [Member] |  |
Derivative [Line Items] |  |
Amounts of Recognized Assets presented in the Statements of Financial Condition | (6,092,070) | (4,742,191)
Financial Instruments for the Benefit of (the Funds) / the Counterparties | 6,092,070 | 4,742,191
Cash Collateral for the Benefit of (the Funds) / the Counterparties | 0 | 0
ProShares UltraShort Bloomberg Crude Oil [Member] | Goldman Sachs International [Member] |  |
Derivative [Line Items] |  |
Amounts of Recognized Assets presented in the Statements of Financial Condition | (3,900,635) | (3,061,395)
Financial Instruments for the Benefit of (the Funds) / the Counterparties | 3,900,635 | 3,061,395
Cash Collateral for the Benefit of (the Funds) / the Counterparties | 0 | 0
ProShares UltraShort Bloomberg Crude Oil [Member] | Societe Generale S.A. [Member] |  |
Derivative [Line Items] |  |
Amounts of Recognized Assets presented in the Statements of Financial Condition | (514,835) | (1,050,699)
Financial Instruments for the Benefit of (the Funds) / the Counterparties | 514,835 | 1,050,699
Cash Collateral for the Benefit of (the Funds) / the Counterparties | 0 | 0
ProShares UltraShort Bloomberg Crude Oil [Member] | UBS AG [Member] |  |
Derivative [Line Items] |  |
Amounts of Recognized Assets presented in the Statements of Financial Condition | (3,170,837) | (3,352,596)
Financial Instruments for the Benefit of (the Funds) / the Counterparties | 3,170,837 | 3,352,596
Cash Collateral for the Benefit of (the Funds) / the Counterparties | 0 | 0
ProShares Ultra Gold [Member] | Citibank N.A. [Member] |  |
Derivative [Line Items] |  |
Amounts of Recognized Assets presented in the Statements of Financial Condition | (2,994,458) | (1,464,982)
Financial Instruments for the Benefit of (the Funds) / the Counterparties | 2,994,458 | 1,464,982
Cash Collateral for the Benefit of (the Funds) / the Counterparties | 0 | 0
ProShares Ultra Gold [Member] | Goldman Sachs International [Member] |  |
Derivative [Line Items] |  |
Amounts of Recognized Assets presented in the Statements of Financial Condition | (2,118,074) | (1,112,916)
Financial Instruments for the Benefit of (the Funds) / the Counterparties | 2,118,074 | 1,112,916
Cash Collateral for the Benefit of (the Funds) / the Counterparties | 0 | 0
ProShares Ultra Gold [Member] | Societe Generale S.A. [Member] |  |
Derivative [Line Items] |  |
Amounts of Recognized Assets presented in the Statements of Financial Condition | (1,015,643) | (643,587)
Financial Instruments for the Benefit of (the Funds) / the Counterparties | 1,015,643 | 643,587
Cash Collateral for the Benefit of (the Funds) / the Counterparties | 0 | 0
ProShares Ultra Gold [Member] | UBS AG [Member] |  |
Derivative [Line Items] |  |
Amounts of Recognized Assets presented in the Statements of Financial Condition | (2,325,252) | (1,209,622)
Financial Instruments for the Benefit of (the Funds) / the Counterparties | 2,325,252 | 1,209,622
Cash Collateral for the Benefit of (the Funds) / the Counterparties | 0 | 0
ProShares Ultra Silver [Member] | Citibank N.A. [Member] |  |
Derivative [Line Items] |  |
Amounts of Recognized Assets presented in the Statements of Financial Condition | (9,405,158) | (6,946,009)
Financial Instruments for the Benefit of (the Funds) / the Counterparties | 9,405,158 | 6,946,009
Cash Collateral for the Benefit of (the Funds) / the Counterparties | 0 | 0
ProShares Ultra Silver [Member] | Goldman Sachs International [Member] |  |
Derivative [Line Items] |  |
Amounts of Recognized Assets presented in the Statements of Financial Condition | (7,478,422) | (5,869,092)
Financial Instruments for the Benefit of (the Funds) / the Counterparties | 7,478,422 | 5,869,092
Cash Collateral for the Benefit of (the Funds) / the Counterparties | 0 | 0
ProShares Ultra Silver [Member] | Societe Generale S.A. [Member] |  |
Derivative [Line Items] |  |
Amounts of Recognized Assets presented in the Statements of Financial Condition | (3,531,263) | (2,532,729)
Financial Instruments for the Benefit of (the Funds) / the Counterparties | 3,531,263 | 2,532,729
Cash Collateral for the Benefit of (the Funds) / the Counterparties | 0 | 0
ProShares Ultra Silver [Member] | UBS AG [Member] |  |
Derivative [Line Items] |  |
Amounts of Recognized Assets presented in the Statements of Financial Condition | (7,828,959) | (5,628,359)
Financial Instruments for the Benefit of (the Funds) / the Counterparties | 7,828,959 | 5,628,359
Cash Collateral for the Benefit of (the Funds) / the Counterparties | 0 | 0
ProShares Ultra Yen [Member] | Goldman Sachs International [Member] |  |
Derivative [Line Items] |  |
Amounts of Recognized Assets presented in the Statements of Financial Condition | (216,458) | (219,736)
Financial Instruments for the Benefit of (the Funds) / the Counterparties | 216,458 | 219,736
Cash Collateral for the Benefit of (the Funds) / the Counterparties | 0 | 0
ProShares Ultra Yen [Member] | UBS AG [Member] |  |
Derivative [Line Items] |  |
Amounts of Recognized Assets presented in the Statements of Financial Condition | (178,851) | (122,340)
Financial Instruments for the Benefit of (the Funds) / the Counterparties | 27,993 | 122,340
Cash Collateral for the Benefit of (the Funds) / the Counterparties | 0 | 0
Net Amounts of Liabilities presented in the Statements of Financial Condition | (150,858) |
ProShares UltraShort Gold [Member] | Citibank N.A. [Member] |  |
Derivative [Line Items] |  |
Amounts of Recognized Assets presented in the Statements of Financial Condition | 1,045,390 | 1,147,811
Net Amounts of Assets presented in the Statements of Financial Condition | 1,045,390 | 1,147,811
ProShares UltraShort Gold [Member] | Goldman Sachs International [Member] |  |
Derivative [Line Items] |  |
Amounts of Recognized Assets presented in the Statements of Financial Condition | 835,086 | 881,454
Financial Instruments for the Benefit of (the Funds) / the Counterparties | (692,611) | (874,948)
Net Amounts of Assets presented in the Statements of Financial Condition | 142,475 | 6,506
ProShares UltraShort Gold [Member] | Societe Generale S.A. [Member] |  |
Derivative [Line Items] |  |
Amounts of Recognized Assets presented in the Statements of Financial Condition | 267,146 | 393,006
Financial Instruments for the Benefit of (the Funds) / the Counterparties | (267,146) | (393,006)
ProShares UltraShort Gold [Member] | UBS AG [Member] |  |
Derivative [Line Items] |  |
Amounts of Recognized Assets presented in the Statements of Financial Condition | 813,983 | 611,295
Cash Collateral for the Benefit of (the Funds) / the Counterparties | (660,000) | (611,295)
Net Amounts of Assets presented in the Statements of Financial Condition | 153,983 |
ProShares UltraShort Silver [Member] | Citibank N.A. [Member] |  |
Derivative [Line Items] |  |
Amounts of Recognized Assets presented in the Statements of Financial Condition | 775,445 | 610,478
Net Amounts of Assets presented in the Statements of Financial Condition | 775,445 | 610,478
ProShares UltraShort Silver [Member] | Goldman Sachs International [Member] |  |
Derivative [Line Items] |  |
Amounts of Recognized Assets presented in the Statements of Financial Condition | 671,956 | 323,829
Financial Instruments for the Benefit of (the Funds) / the Counterparties |  | (323,829)
Net Amounts of Assets presented in the Statements of Financial Condition | 671,956 |
ProShares UltraShort Silver [Member] | Societe Generale S.A. [Member] |  |
Derivative [Line Items] |  |
Amounts of Recognized Assets presented in the Statements of Financial Condition | 143,987 | 86,543
Financial Instruments for the Benefit of (the Funds) / the Counterparties |  | (86,543)
Net Amounts of Assets presented in the Statements of Financial Condition | 143,987 |
ProShares UltraShort Silver [Member] | UBS AG [Member] |  |
Derivative [Line Items] |  |
Amounts of Recognized Assets presented in the Statements of Financial Condition | 561,045 | 363,396
Cash Collateral for the Benefit of (the Funds) / the Counterparties | (350,000) | (363,396)
Net Amounts of Assets presented in the Statements of Financial Condition | 211,045 |
ProShares UltraShort Yen [Member] | Goldman Sachs International [Member] |  |
Derivative [Line Items] |  |
Amounts of Recognized Assets presented in the Statements of Financial Condition | 4,588,344 | 8,256,779
Financial Instruments for the Benefit of (the Funds) / the Counterparties | (4,588,344) | (7,771,819)
Net Amounts of Assets presented in the Statements of Financial Condition |  | 484,960
ProShares UltraShort Yen [Member] | UBS AG [Member] |  |
Derivative [Line Items] |  |
Amounts of Recognized Assets presented in the Statements of Financial Condition | 4,658,535 | 8,488,158
Cash Collateral for the Benefit of (the Funds) / the Counterparties | (4,550,000) | (7,980,000)
Net Amounts of Assets presented in the Statements of Financial Condition | 108,535 | 508,158
ProShares Ultra Euro [Member] | Goldman Sachs International [Member] |  |
Derivative [Line Items] |  |
Amounts of Recognized Assets presented in the Statements of Financial Condition | (103,093) | (239,256)
Financial Instruments for the Benefit of (the Funds) / the Counterparties | 103,093 | 239,256
Cash Collateral for the Benefit of (the Funds) / the Counterparties | 0 | 0
ProShares Ultra Euro [Member] | UBS AG [Member] |  |
Derivative [Line Items] |  |
Amounts of Recognized Assets presented in the Statements of Financial Condition | (106,267) | (334,754)
Financial Instruments for the Benefit of (the Funds) / the Counterparties | 106,267 | 334,754
Cash Collateral for the Benefit of (the Funds) / the Counterparties | $ 0 | $ 0

X
- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 + Details
Name: | us-gaap_DerivativeAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41678-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226016-175313 + Details
Name: | us-gaap_DerivativeCollateralObligationToReturnCash
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of obligation to return securities collateral under master netting arrangements that have not been offset against derivative assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226016-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
Name: | us-gaap_DerivativeCollateralObligationToReturnSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226016-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41678-113959 + Details
Name: | us-gaap_DerivativeCollateralRightToReclaimCash
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of right to receive securities collateral under master netting arrangements that have not been offset against derivative liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226016-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
Name: | us-gaap_DerivativeCollateralRightToReclaimSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226006-175313 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41678-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
Name: | us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value, after offset of derivative asset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41678-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226006-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 + Details
Name: | us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
Name: | us-gaap_DerivativeLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=ck0001415311_GoldmanSachsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=ck0001415311_UbsAgMember
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: | us-gaap_DerivativeInstrumentRiskAxis=ck0001415311_CitibankNaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=ck0001415311_SocieteGeneraleSaMember
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: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesUltraGoldMember
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: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesUltraYenMember
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: | us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesUltraShortYenMember
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: |