v2.4.0.8

Schedule of Investments - Future Contracts Purchased (Parenthetical) (Detail) (USD $) | 3 Months Ended
--- | ---
Mar. 31, 2014
ProShares Ultra DJ-UBS Crude Oil [Member] |
Schedule of Investments [Line Items] |
Cash Collateral Pledged To Cover Margin Requirements | $ 2,925,780
ProShares Ultra DJ-UBS Natural Gas [Member] |
Schedule of Investments [Line Items] |
Cash Collateral Pledged To Cover Margin Requirements | 3,204,300
ProShares Ultra Gold [Member] |
Schedule of Investments [Line Items] |
Cash Collateral Pledged To Cover Margin Requirements | 15,950
ProShares Ultra Silver [Member] |
Schedule of Investments [Line Items] |
Cash Collateral Pledged To Cover Margin Requirements | 22,000
ProShares Ultra Australian Dollar [Member] |
Schedule of Investments [Line Items] |
Cash Collateral Pledged To Cover Margin Requirements | 152,625
ProShares VIX Short-Term Futures ETF [Member] |
Schedule of Investments [Line Items] |
Cash Collateral Pledged To Cover Margin Requirements | 24,889,000
ProShares VIX Mid-Term Futures ETF [Member] |
Schedule of Investments [Line Items] |
Cash Collateral Pledged To Cover Margin Requirements | 9,129,600
ProShares Ultra VIX Short-Term Futures ETF [Member] |
Schedule of Investments [Line Items] |
Cash Collateral Pledged To Cover Margin Requirements | $ 134,046,000

X
- Definition Cash collateral pledged to cover margin requirements. + References No definition available. + Details
Name: | ck0001415311_CashCollateralPledgedToCoverMarginRequirements
Namespace Prefix: | ck0001415311_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_ScheduleOfInvestmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration