v2.4.0.6

Creation and Redemption of Creation Units (Schedule of Transaction Fees) (Detail) (USD $) | 3 Months Ended
--- | ---
Mar. 31, 2013
ProShares UltraShort DJ-UBS Commodity [Member] |
Creation And Redemption Of Creation Units [Line Items] |
Transaction fees |
ProShares UltraShort DJ-UBS Crude Oil [Member] |
Creation And Redemption Of Creation Units [Line Items] |
Transaction fees | 25,356
ProShares UltraShort DJ-UBS Natural Gas [Member] |
Creation And Redemption Of Creation Units [Line Items] |
Transaction fees | 2,081
ProShares UltraShort Gold [Member] |
Creation And Redemption Of Creation Units [Line Items] |
Transaction fees | 5,859
ProShares UltraShort Silver [Member] |
Creation And Redemption Of Creation Units [Line Items] |
Transaction fees | 13,038
ProShares Short Euro [Member] |
Creation And Redemption Of Creation Units [Line Items] |
Transaction fees |
ProShares UltraShort Australian Dollar [Member] |
Creation And Redemption Of Creation Units [Line Items] |
Transaction fees |
ProShares UltraShort Euro [Member] |
Creation And Redemption Of Creation Units [Line Items] |
Transaction fees |
ProShares UltraShort Yen [Member] |
Creation And Redemption Of Creation Units [Line Items] |
Transaction fees |
ProShares Ultra DJ-UBS Commodity [Member] |
Creation And Redemption Of Creation Units [Line Items] |
Transaction fees | 283
ProShares Ultra DJ-UBS Crude Oil [Member] |
Creation And Redemption Of Creation Units [Line Items] |
Transaction fees | 53,244
ProShares Ultra DJ-UBS Natural Gas [Member] |
Creation And Redemption Of Creation Units [Line Items] |
Transaction fees | 11,710
ProShares Ultra Gold [Member] |
Creation And Redemption Of Creation Units [Line Items] |
Transaction fees | 1,715
ProShares Ultra Silver [Member] |
Creation And Redemption Of Creation Units [Line Items] |
Transaction fees | 20,251
ProShares Ultra Australian Dollar [Member] |
Creation And Redemption Of Creation Units [Line Items] |
Transaction fees |
ProShares Ultra Euro [Member] |
Creation And Redemption Of Creation Units [Line Items] |
Transaction fees |
ProShares Ultra Yen [Member] |
Creation And Redemption Of Creation Units [Line Items] |
Transaction fees |
ProShares VIX Short-Term Futures ETF [Member] |
Creation And Redemption Of Creation Units [Line Items] |
Transaction fees |
ProShares VIX Mid-Term Futures ETF [Member] |
Creation And Redemption Of Creation Units [Line Items] |
Transaction fees |
ProShares Ultra VIX Short-Term Futures ETF [Member] |
Creation And Redemption Of Creation Units [Line Items] |
Transaction fees | 213,290
ProShares Short VIX Short-Term Futures ETF [Member] |
Creation And Redemption Of Creation Units [Line Items] |
Transaction fees | 32,376
Total Trust [Member] |
Creation And Redemption Of Creation Units [Line Items] |
Transaction fees | $ 379,203

X
- Details
Name: | ck0001415311_CreationAndRedemptionOfCreationUnitsLineItems
Namespace Prefix: | ck0001415311_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Transaction Fees + References No definition available. + Details
Name: | ck0001415311_TransactionFees
Namespace Prefix: | ck0001415311_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration