v2.4.0.8

Organization - Additional Information (Detail) (USD $) | 3 Months Ended
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Mar. 31, 2014 Trust
Organization [Line Items] |
Number of series of Trust | 21
Number of shares of each Leveraged Fund | 14
Aggregate purchase price of each Leveraged Fund | $ 350
Number of days for expected multiple returns | 1 day
ProShares UltraShort DJ-UBS Commodity [Member] |
Organization [Line Items] |
Aggregate purchase price of each Leveraged Fund | 350
ProShares UltraShort DJ-UBS Crude Oil [Member] |
Organization [Line Items] |
Aggregate purchase price of each Leveraged Fund | 350
ProShares UltraShort Gold [Member] |
Organization [Line Items] |
Aggregate purchase price of each Leveraged Fund | 350
ProShares UltraShort Silver [Member] |
Organization [Line Items] |
Aggregate purchase price of each Leveraged Fund | 350
ProShares UltraShort Euro [Member] |
Organization [Line Items] |
Aggregate purchase price of each Leveraged Fund | 350
ProShares UltraShort Yen [Member] |
Organization [Line Items] |
Aggregate purchase price of each Leveraged Fund | 350
ProShares Ultra DJ-UBS Commodity [Member] |
Organization [Line Items] |
Aggregate purchase price of each Leveraged Fund | 350
ProShares Ultra DJ-UBS Crude Oil [Member] |
Organization [Line Items] |
Aggregate purchase price of each Leveraged Fund | 350
ProShares Ultra Gold [Member] |
Organization [Line Items] |
Aggregate purchase price of each Leveraged Fund | 350
ProShares Ultra Silver [Member] |
Organization [Line Items] |
Aggregate purchase price of each Leveraged Fund | 350
ProShares Ultra Euro [Member] |
Organization [Line Items] |
Aggregate purchase price of each Leveraged Fund | 350
ProShares Ultra Yen [Member] |
Organization [Line Items] |
Aggregate purchase price of each Leveraged Fund | $ 350

X
- Definition Aggregate purchase of each fund. + References No definition available. + Details
Name: | ck0001415311_AggregatePurchaseOfEachFund
Namespace Prefix: | ck0001415311_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of days for expected multiple returns + References No definition available. + Details
Name: | ck0001415311_NumberOfDaysForExpectedMultipleReturns
Namespace Prefix: | ck0001415311_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of series. + References No definition available. + Details
Name: | ck0001415311_NumberOfSeries
Namespace Prefix: | ck0001415311_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares of each fund. + References No definition available. + Details
Name: | ck0001415311_NumberOfSharesOfEachFund
Namespace Prefix: | ck0001415311_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ck0001415311_OrganizationLineItems
Namespace Prefix: | ck0001415311_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration