v2.4.0.8

Organization - Additional Information (Detail) (USD $)	3 Months Ended
	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

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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