v2.4.0.8
Investments - Gross Amounts not Offset in the Statement of Financial Condition (Detail) (USD $)
Jun. 30, 2014
Dec. 31, 2013
ProShares UltraShort Bloomberg Commodity [Member] | Deutsche Bank AG [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition $ (20,115) $ (11,710)
Financial Instruments for the Benefit of /the Counterparties 20,115 11,710
Cash Collateral for the Benefit of / the Counterparties 0 0
Net Amount 0 0
ProShares UltraShort Bloomberg Commodity [Member] | Goldman Sachs International [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition (17,081) (12,945)
Financial Instruments for the Benefit of /the Counterparties 17,081 12,945
Cash Collateral for the Benefit of / the Counterparties 0 0
Net Amount 0 0
ProShares UltraShort Bloomberg Commodity [Member] | UBS AG [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition (12,523) (3,010)
Financial Instruments for the Benefit of /the Counterparties 12,523 3,010
Cash Collateral for the Benefit of / the Counterparties 0 0
Net Amount 0 0
ProShares UltraShort Bloomberg Crude Oil [Member] | Deutsche Bank AG [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition (4,518,754) (570,114)
Financial Instruments for the Benefit of /the Counterparties 4,518,754 570,114
Cash Collateral for the Benefit of / the Counterparties 0 0
Net Amount 0 0
ProShares UltraShort Bloomberg Crude Oil [Member] | Goldman Sachs International [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition (4,396,306) (632,990)
Financial Instruments for the Benefit of /the Counterparties 4,396,306 632,990
Cash Collateral for the Benefit of / the Counterparties 0 0
Net Amount 0 0
ProShares UltraShort Bloomberg Crude Oil [Member] | UBS AG [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition (4,474,983) (727,210)
Financial Instruments for the Benefit of /the Counterparties 4,474,983 727,210
Cash Collateral for the Benefit of / the Counterparties 0 0
Net Amount 0 0
ProShares UltraShort Bloomberg Crude Oil [Member] | Societe Generale S.A. [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition (2,715,109) (402,586)
Financial Instruments for the Benefit of /the Counterparties 2,715,109 402,586
Cash Collateral for the Benefit of / the Counterparties 0 0
Net Amount 0 0
ProShares UltraShort Bloomberg Crude Oil [Member] | Goldman Sachs & Co. [Member]
   
Derivative [Line Items]    
Amounts of Recognized Assets presented in the Statement of Financial Condition 778,232 1,503,943
Financial Instruments for the Funds /the Counterparties 0 0
Cash Collateral for the Funds / the Counterparties 0 0
Net Amount 778,232 1,503,943
ProShares UltraShort Silver [Member] | Deutsche Bank AG [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition (5,772,553) (445,752)
Financial Instruments for the Benefit of /the Counterparties 5,772,553 445,752
Cash Collateral for the Benefit of / the Counterparties 0 0
Net Amount 0 0
ProShares UltraShort Silver [Member] | Goldman Sachs International [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition (1,869,870) (1,257,636)
Financial Instruments for the Benefit of /the Counterparties 1,869,870 1,257,636
Cash Collateral for the Benefit of / the Counterparties 0 0
Net Amount 0 0
ProShares UltraShort Silver [Member] | UBS AG [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition (1,961,018) (517,110)
Financial Instruments for the Benefit of /the Counterparties 1,961,018 517,110
Cash Collateral for the Benefit of / the Counterparties 0 0
Net Amount 0 0
ProShares UltraShort Silver [Member] | Societe Generale S.A. [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition (959,772) (7,359)
Financial Instruments for the Benefit of /the Counterparties 959,772 7,359
Cash Collateral for the Benefit of / the Counterparties 0 0
Net Amount 0 0
ProShares UltraShort Silver [Member] | Goldman Sachs & Co. [Member]
   
Derivative [Line Items]    
Amounts of Recognized Assets presented in the Statement of Financial Condition 780 2,450
Financial Instruments for the Funds /the Counterparties 0 0
Cash Collateral for the Funds / the Counterparties 0 0
Net Amount 780 2,450
ProShares UltraShort Australian Dollar [Member] | RBC Capital Markets [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition (17,160) (86,166)
Financial Instruments for the Benefit of /the Counterparties 0 0
Cash Collateral for the Benefit of / the Counterparties 17,160 86,166
Net Amount 0 0
ProShares UltraShort Euro [Member] | Goldman Sachs International [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition (2,728,154) (6,820,802)
Financial Instruments for the Benefit of /the Counterparties 2,728,154 6,820,802
Cash Collateral for the Benefit of / the Counterparties 0 0
Net Amount 0 0
Amounts of Recognized Assets presented in the Statement of Financial Condition   64,104
Financial Instruments for the Funds /the Counterparties   0
Cash Collateral for the Funds / the Counterparties   0
Net Amount   64,104
ProShares UltraShort Euro [Member] | UBS AG [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition (2,859,187) (7,079,056)
Financial Instruments for the Benefit of /the Counterparties 2,859,187 7,079,056
Cash Collateral for the Benefit of / the Counterparties 0 0
Net Amount 0 0
Amounts of Recognized Assets presented in the Statement of Financial Condition   87,247
Financial Instruments for the Funds /the Counterparties   0
Cash Collateral for the Funds / the Counterparties   0
Net Amount   87,247
ProShares UltraShort Yen [Member] | Goldman Sachs International [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition (4,793,422) (884,849)
Financial Instruments for the Benefit of /the Counterparties 4,793,422 884,849
Cash Collateral for the Benefit of / the Counterparties 0 0
Net Amount 0 0
Amounts of Recognized Assets presented in the Statement of Financial Condition   15,716,318
Financial Instruments for the Funds /the Counterparties   (13,635,426)
Cash Collateral for the Funds / the Counterparties   0
Net Amount   2,080,892
ProShares UltraShort Yen [Member] | UBS AG [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition (4,854,188) (1,046,035)
Financial Instruments for the Benefit of /the Counterparties 4,854,188 1,046,035
Cash Collateral for the Benefit of / the Counterparties 0 0
Net Amount 0 0
Amounts of Recognized Assets presented in the Statement of Financial Condition   15,601,250
Financial Instruments for the Funds /the Counterparties   (14,004,926)
Cash Collateral for the Funds / the Counterparties   0
Net Amount   1,596,324
ProShares Ultra Bloomberg Crude Oil [Member] | Deutsche Bank AG [Member]
   
Derivative [Line Items]    
Amounts of Recognized Assets presented in the Statement of Financial Condition 1,035,637 622,117
Financial Instruments for the Funds /the Counterparties 0 0
Cash Collateral for the Funds / the Counterparties (1,035,637) (622,117)
Net Amount 0 0
ProShares Ultra Bloomberg Crude Oil [Member] | Goldman Sachs International [Member]
   
Derivative [Line Items]    
Amounts of Recognized Assets presented in the Statement of Financial Condition 1,328,164 576,723
Financial Instruments for the Funds /the Counterparties (1,328,164) (576,723)
Cash Collateral for the Funds / the Counterparties 0 0
Net Amount 0 0
ProShares Ultra Bloomberg Crude Oil [Member] | UBS AG [Member]
   
Derivative [Line Items]    
Amounts of Recognized Assets presented in the Statement of Financial Condition 1,117,318 483,237
Financial Instruments for the Funds /the Counterparties (1,117,318) (483,237)
Cash Collateral for the Funds / the Counterparties 0 0
Net Amount 0 0
ProShares Ultra Bloomberg Crude Oil [Member] | Societe Generale S.A. [Member]
   
Derivative [Line Items]    
Amounts of Recognized Assets presented in the Statement of Financial Condition 629,911 275,816
Financial Instruments for the Funds /the Counterparties (629,911) (275,816)
Cash Collateral for the Funds / the Counterparties 0 0
Net Amount 0 0
ProShares Ultra Bloomberg Crude Oil [Member] | Goldman Sachs & Co. [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition (313,787) (997,210)
Financial Instruments for the Benefit of /the Counterparties 0 0
Cash Collateral for the Benefit of / the Counterparties 313,787 997,210
Net Amount 0 0
ProShares Ultra Bloomberg Natural Gas [Member] | Goldman Sachs & Co. [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition   (5,628,532)
Financial Instruments for the Benefit of /the Counterparties   0
Cash Collateral for the Benefit of / the Counterparties   4,630,277
Net Amount   (998,255)
Amounts of Recognized Assets presented in the Statement of Financial Condition 111,842  
Financial Instruments for the Funds /the Counterparties 0  
Cash Collateral for the Funds / the Counterparties 0  
Net Amount 111,842  
ProShares Ultra Gold [Member] | Deutsche Bank AG [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition   (3,543,937)
Financial Instruments for the Benefit of /the Counterparties   3,543,937
Cash Collateral for the Benefit of / the Counterparties   0
Net Amount   0
Amounts of Recognized Assets presented in the Statement of Financial Condition 7,156,303  
Financial Instruments for the Funds /the Counterparties 0  
Cash Collateral for the Funds / the Counterparties (7,156,303)  
Net Amount 0  
ProShares Ultra Gold [Member] | Goldman Sachs International [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition   (1,327,335)
Financial Instruments for the Benefit of /the Counterparties   1,327,335
Cash Collateral for the Benefit of / the Counterparties   0
Net Amount   0
Amounts of Recognized Assets presented in the Statement of Financial Condition 2,462,460  
Financial Instruments for the Funds /the Counterparties (2,440,832)  
Cash Collateral for the Funds / the Counterparties 0  
Net Amount 21,628  
ProShares Ultra Gold [Member] | UBS AG [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition   (1,156,664)
Financial Instruments for the Benefit of /the Counterparties   1,156,664
Cash Collateral for the Benefit of / the Counterparties   0
Net Amount   0
Amounts of Recognized Assets presented in the Statement of Financial Condition 2,229,899  
Financial Instruments for the Funds /the Counterparties (2,229,899)  
Cash Collateral for the Funds / the Counterparties 0  
Net Amount 0  
ProShares Ultra Gold [Member] | Societe Generale S.A. [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition   (785,038)
Financial Instruments for the Benefit of /the Counterparties   785,038
Cash Collateral for the Benefit of / the Counterparties   0
Net Amount   0
Amounts of Recognized Assets presented in the Statement of Financial Condition 1,379,253  
Financial Instruments for the Funds /the Counterparties (1,379,253)  
Cash Collateral for the Funds / the Counterparties 0  
Net Amount 0  
ProShares Ultra Gold [Member] | Goldman Sachs & Co. [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition (120) (300)
Financial Instruments for the Benefit of /the Counterparties 0 0
Cash Collateral for the Benefit of / the Counterparties 120 300
Net Amount 0 0
ProShares Ultra Silver [Member] | Deutsche Bank AG [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition   (350,663)
Financial Instruments for the Benefit of /the Counterparties   350,663
Cash Collateral for the Benefit of / the Counterparties   0
Net Amount   0
Amounts of Recognized Assets presented in the Statement of Financial Condition 45,349,782  
Financial Instruments for the Funds /the Counterparties 0  
Cash Collateral for the Funds / the Counterparties (45,349,782)  
Net Amount 0  
ProShares Ultra Silver [Member] | Goldman Sachs International [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition   (1,345,433)
Financial Instruments for the Benefit of /the Counterparties   1,345,433
Cash Collateral for the Benefit of / the Counterparties   0
Net Amount   0
Amounts of Recognized Assets presented in the Statement of Financial Condition 16,680,099  
Financial Instruments for the Funds /the Counterparties (16,680,099)  
Cash Collateral for the Funds / the Counterparties 0  
Net Amount 0  
ProShares Ultra Silver [Member] | UBS AG [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition   (768,203)
Financial Instruments for the Benefit of /the Counterparties   768,203
Cash Collateral for the Benefit of / the Counterparties   0
Net Amount   0
Amounts of Recognized Assets presented in the Statement of Financial Condition 15,649,421  
Financial Instruments for the Funds /the Counterparties (15,649,421)  
Cash Collateral for the Funds / the Counterparties 0  
Net Amount 0  
ProShares Ultra Silver [Member] | Societe Generale S.A. [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition   (28,581)
Financial Instruments for the Benefit of /the Counterparties   28,581
Cash Collateral for the Benefit of / the Counterparties   0
Net Amount   0
Amounts of Recognized Assets presented in the Statement of Financial Condition 9,222,909  
Financial Instruments for the Funds /the Counterparties (9,222,909)  
Cash Collateral for the Funds / the Counterparties 0  
Net Amount 0  
ProShares Ultra Silver [Member] | Goldman Sachs & Co. [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition (575) (2,450)
Financial Instruments for the Benefit of /the Counterparties 0 0
Cash Collateral for the Benefit of / the Counterparties 45 2,450
Net Amount (530) 0
ProShares Ultra Euro [Member] | Goldman Sachs International [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition   (19,770)
Financial Instruments for the Benefit of /the Counterparties   19,770
Cash Collateral for the Benefit of / the Counterparties   0
Net Amount   0
Amounts of Recognized Assets presented in the Statement of Financial Condition 5,649 56,991
Financial Instruments for the Funds /the Counterparties 0 0
Cash Collateral for the Funds / the Counterparties 0 0
Net Amount 5,649 56,991
ProShares Ultra Euro [Member] | UBS AG [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition   (176)
Financial Instruments for the Benefit of /the Counterparties   176
Cash Collateral for the Benefit of / the Counterparties   0
Net Amount   0
Amounts of Recognized Assets presented in the Statement of Financial Condition 25,078 63,917
Financial Instruments for the Funds /the Counterparties 0 0
Cash Collateral for the Funds / the Counterparties 0 0
Net Amount 25,078 63,917
ProShares Ultra Yen [Member] | Goldman Sachs International [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition   (78,309)
Financial Instruments for the Benefit of /the Counterparties   78,309
Cash Collateral for the Benefit of / the Counterparties   0
Net Amount   0
Amounts of Recognized Assets presented in the Statement of Financial Condition   2,462
Financial Instruments for the Funds /the Counterparties   0
Cash Collateral for the Funds / the Counterparties   0
Net Amount   2,462
ProShares Ultra Yen [Member] | UBS AG [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition   (85,052)
Financial Instruments for the Benefit of /the Counterparties   85,052
Cash Collateral for the Benefit of / the Counterparties   0
Net Amount   0
Amounts of Recognized Assets presented in the Statement of Financial Condition 40,546 1,590
Financial Instruments for the Funds /the Counterparties 0 0
Cash Collateral for the Funds / the Counterparties 0 0
Net Amount 40,546 1,590
ProShares Ultra Yen [Member] | RBC Capital Markets [Member]
   
Derivative [Line Items]    
Amounts of Recognized Assets presented in the Statement of Financial Condition 12,173  
Financial Instruments for the Funds /the Counterparties 0  
Cash Collateral for the Funds / the Counterparties 0  
Net Amount 12,173  
ProShares Ultra VIX Short-Term Futures ETF [Member] | RBC Capital Markets [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition (5,702,682) (3,356,803)
Financial Instruments for the Benefit of /the Counterparties 0 0
Cash Collateral for the Benefit of / the Counterparties 5,702,682 3,356,803
Net Amount 0 0
ProShares Ultra Bloomberg Commodity [Member] | Deutsche Bank AG [Member]
   
Derivative [Line Items]    
Amounts of Recognized Assets presented in the Statement of Financial Condition 7,260 6,454
Financial Instruments for the Funds /the Counterparties 0 0
Cash Collateral for the Funds / the Counterparties 0 0
Net Amount 7,260 6,454
ProShares Ultra Bloomberg Commodity [Member] | Goldman Sachs International [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition (5,077)  
Financial Instruments for the Benefit of /the Counterparties 5,077  
Cash Collateral for the Benefit of / the Counterparties 0  
Net Amount 0  
Amounts of Recognized Assets presented in the Statement of Financial Condition   4,974
Financial Instruments for the Funds /the Counterparties   0
Cash Collateral for the Funds / the Counterparties   0
Net Amount   4,974
ProShares Ultra Bloomberg Commodity [Member] | UBS AG [Member]
   
Derivative [Line Items]    
Amounts of Recognized Assets presented in the Statement of Financial Condition 6,861 3,650
Financial Instruments for the Funds /the Counterparties 0 0
Cash Collateral for the Funds / the Counterparties 0 0
Net Amount 6,861 3,650
ProShares Ultra Australian Dollar [Member] | RBC Capital Markets [Member]
   
Derivative [Line Items]    
Amounts of Recognized Assets presented in the Statement of Financial Condition 3,080 10,650
Financial Instruments for the Funds /the Counterparties 0 0
Cash Collateral for the Funds / the Counterparties 0 0
Net Amount 3,080 10,650
ProShares UltraShort Bloomberg Natural Gas [Member] | Goldman Sachs & Co. [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition (730,316)  
Financial Instruments for the Benefit of /the Counterparties 0  
Cash Collateral for the Benefit of / the Counterparties 730,316  
Net Amount 0  
Amounts of Recognized Assets presented in the Statement of Financial Condition   1,520,548
Financial Instruments for the Funds /the Counterparties   0
Cash Collateral for the Funds / the Counterparties   0
Net Amount   1,520,548
ProShares UltraShort Gold [Member] | Deutsche Bank AG [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition (5,448,091)  
Financial Instruments for the Benefit of /the Counterparties 5,448,091  
Cash Collateral for the Benefit of / the Counterparties 0  
Net Amount 0  
Amounts of Recognized Assets presented in the Statement of Financial Condition   2,258,281
Financial Instruments for the Funds /the Counterparties   0
Cash Collateral for the Funds / the Counterparties   (2,258,281)
Net Amount   0
ProShares UltraShort Gold [Member] | Goldman Sachs International [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition (2,015,729)  
Financial Instruments for the Benefit of /the Counterparties 2,015,729  
Cash Collateral for the Benefit of / the Counterparties 0  
Net Amount 0  
Amounts of Recognized Assets presented in the Statement of Financial Condition   1,411,290
Financial Instruments for the Funds /the Counterparties   (1,411,290)
Cash Collateral for the Funds / the Counterparties   0
Net Amount   0
ProShares UltraShort Gold [Member] | UBS AG [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition (2,001,545)  
Financial Instruments for the Benefit of /the Counterparties 2,001,545  
Cash Collateral for the Benefit of / the Counterparties 0  
Net Amount 0  
Amounts of Recognized Assets presented in the Statement of Financial Condition   1,298,438
Financial Instruments for the Funds /the Counterparties   (1,298,438)
Cash Collateral for the Funds / the Counterparties   0
Net Amount   0
ProShares UltraShort Gold [Member] | Societe Generale S.A. [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition (1,118,143)  
Financial Instruments for the Benefit of /the Counterparties 1,118,143  
Cash Collateral for the Benefit of / the Counterparties 0  
Net Amount 0  
Amounts of Recognized Assets presented in the Statement of Financial Condition   665,044
Financial Instruments for the Funds /the Counterparties   (665,044)
Cash Collateral for the Funds / the Counterparties   0
Net Amount   0
ProShares UltraShort Gold [Member] | Goldman Sachs & Co. [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition (1,000)  
Financial Instruments for the Benefit of /the Counterparties 0  
Cash Collateral for the Benefit of / the Counterparties 1,000  
Net Amount 0  
Amounts of Recognized Assets presented in the Statement of Financial Condition   300
Financial Instruments for the Funds /the Counterparties   0
Cash Collateral for the Funds / the Counterparties   0
Net Amount   300
ProShares Short Euro [Member] | RBC Capital Markets [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition (49,240)  
Financial Instruments for the Benefit of /the Counterparties 0  
Cash Collateral for the Benefit of / the Counterparties 49,240  
Net Amount 0  
Amounts of Recognized Assets presented in the Statement of Financial Condition   9,100
Financial Instruments for the Funds /the Counterparties   0
Cash Collateral for the Funds / the Counterparties   0
Net Amount   9,100
ProShares VIX Short-Term Futures ETF [Member] | RBC Capital Markets [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition (1,041,667)  
Financial Instruments for the Benefit of /the Counterparties 0  
Cash Collateral for the Benefit of / the Counterparties 1,041,667  
Net Amount 0  
Amounts of Recognized Assets presented in the Statement of Financial Condition   3,179,017
Financial Instruments for the Funds /the Counterparties   0
Cash Collateral for the Funds / the Counterparties   0
Net Amount   3,179,017
ProShares VIX Mid-Term Futures ETF [Member] | RBC Capital Markets [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition (522,035)  
Financial Instruments for the Benefit of /the Counterparties 0  
Cash Collateral for the Benefit of / the Counterparties 522,035  
Net Amount 0  
Amounts of Recognized Assets presented in the Statement of Financial Condition   100,734
Financial Instruments for the Funds /the Counterparties   0
Cash Collateral for the Funds / the Counterparties   0
Net Amount   100,734
ProShares Short VIX Short-Term Futures ETF [Member] | RBC Capital Markets [Member]
   
Derivative [Line Items]    
Amounts of Recognized Liabilities presented in the Statement of Financial Condition (14,181)  
Financial Instruments for the Benefit of /the Counterparties 0  
Cash Collateral for the Benefit of / the Counterparties 14,181  
Net Amount 0  
Amounts of Recognized Assets presented in the Statement of Financial Condition   603,833
Financial Instruments for the Funds /the Counterparties   0
Cash Collateral for the Funds / the Counterparties   0
Net Amount   $ 603,833