v2.4.0.6

Significant Accounting Policies (Calculation of Funds' Final Net Asset Value for Creation and Redemption of Fund Shares) (Detail) | Mar. 31, 2013
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ProShares UltraShort Silver [Member] |
Significant Accounting Policies [Line Items] |
NAV Calculation Time | 7:00 A.M.
NAV Calculation Date | March 28
ProShares Ultra Silver [Member] |
Significant Accounting Policies [Line Items] |
NAV Calculation Time | 7:00 A.M.
NAV Calculation Date | March 28
ProShares UltraShort Gold [Member] |
Significant Accounting Policies [Line Items] |
NAV Calculation Time | 10:00 A.M.
NAV Calculation Date | March 28
ProShares Ultra Gold [Member] |
Significant Accounting Policies [Line Items] |
NAV Calculation Time | 10:00 A.M.
NAV Calculation Date | March 28
ProShares UltraShort DJ-UBS Crude Oil [Member] |
Significant Accounting Policies [Line Items] |
NAV Calculation Time | 2:30 P.M.
NAV Calculation Date | March 28
ProShares Ultra DJ-UBS Crude Oil [Member] |
Significant Accounting Policies [Line Items] |
NAV Calculation Time | 2:30 P.M.
NAV Calculation Date | March 28
ProShares UltraShort DJ-UBS Natural Gas [Member] |
Significant Accounting Policies [Line Items] |
NAV Calculation Time | 2:30 P.M.
NAV Calculation Date | March 28
ProShares Ultra DJ-UBS Natural Gas [Member] |
Significant Accounting Policies [Line Items] |
NAV Calculation Time | 2:30 P.M.
NAV Calculation Date | March 28
ProShares UltraShort DJ-UBS Commodity [Member] |
Significant Accounting Policies [Line Items] |
NAV Calculation Time | 3:00 P.M.
NAV Calculation Date | March 28
ProShares Ultra DJ-UBS Commodity [Member] |
Significant Accounting Policies [Line Items] |
NAV Calculation Time | 3:00 P.M.
NAV Calculation Date | March 28
ProShares UltraShort Australian Dollar [Member] |
Significant Accounting Policies [Line Items] |
NAV Calculation Time | 4:00 P.M.
NAV Calculation Date | March 28
ProShares Ultra Australian Dollar [Member] |
Significant Accounting Policies [Line Items] |
NAV Calculation Time | 4:00 P.M.
NAV Calculation Date | March 28
ProShares Short Euro [Member] |
Significant Accounting Policies [Line Items] |
NAV Calculation Time | 4:00 P.M.
NAV Calculation Date | March 28
ProShares UltraShort Euro [Member] |
Significant Accounting Policies [Line Items] |
NAV Calculation Time | 4:00 P.M.
NAV Calculation Date | March 28
ProShares Ultra Euro [Member] |
Significant Accounting Policies [Line Items] |
NAV Calculation Time | 4:00 P.M.
NAV Calculation Date | March 28
ProShares UltraShort Yen [Member] |
Significant Accounting Policies [Line Items] |
NAV Calculation Time | 4:00 P.M.
NAV Calculation Date | March 28
ProShares Ultra Yen [Member] |
Significant Accounting Policies [Line Items] |
NAV Calculation Time | 4:00 P.M.
NAV Calculation Date | March 28
ProShares VIX Short-Term Futures ETF [Member] |
Significant Accounting Policies [Line Items] |
NAV Calculation Time | 4:15 P.M.
NAV Calculation Date | March 28
ProShares Ultra VIX Short-Term Futures ETF [Member] |
Significant Accounting Policies [Line Items] |
NAV Calculation Time | 4:15 P.M.
NAV Calculation Date | March 28
ProShares Short VIX Short-Term Futures ETF [Member] |
Significant Accounting Policies [Line Items] |
NAV Calculation Time | 4:15 P.M.
NAV Calculation Date | March 28
ProShares VIX Mid-Term Futures ETF [Member] |
Significant Accounting Policies [Line Items] |
NAV Calculation Time | 4:15 P.M.
NAV Calculation Date | March 28

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Namespace Prefix: | ck0001415311_
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X
- Definition Net Asset Value Calculation Time + References No definition available. + Details
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Namespace Prefix: | ck0001415311_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | instant

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