v2.4.0.8
Schedule of Investments - Short-Term U.S. Government and Agency Obligations (Parenthetical) (Detail) (USD $)
 3 Months Ended
Mar. 31, 2014
ProShares UltraShort DJ-UBS Commodity [Member]
  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 76.00%
Debt instrument, maturity date $ 2,486,639
ProShares UltraShort DJ-UBS Commodity [Member] | U.S. Treasury Bills 0.061% Due 04/10/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.061% [1]
Debt instrument, maturity date Apr. 10, 2014 [1]
ProShares UltraShort DJ-UBS Commodity [Member] | U.S. Treasury Bills 0.046% Due 06/05/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.046%
Debt instrument, maturity date Jun. 05, 2014
ProShares UltraShort DJ-UBS Commodity [Member] | U.S.Treasury Bills 0.045% Due 06/19/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.045% [1]
Debt instrument, maturity date Jun. 19, 2014 [1]
ProShares UltraShort DJ-UBS Commodity [Member] | U.S. Treasury Bills 0.070% Due 08/14/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.07% [1]
Debt instrument, maturity date Aug. 14, 2014 [1]
ProShares UltraShort DJ-UBS Crude Oil [Member]
  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 91.00%
Debt instrument, maturity date 288,249,529
ProShares UltraShort DJ-UBS Crude Oil [Member] | U.S. Treasury Bills 0.061% Due 04/10/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.061%
Debt instrument, maturity date Apr. 10, 2014
ProShares UltraShort DJ-UBS Crude Oil [Member] | U,.S. Treasury Bills 0.075% Due 04/03/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.075%
Debt instrument, maturity date Apr. 03, 2014
ProShares UltraShort DJ-UBS Crude Oil [Member] | U.S. Treasury Bills 0.080% Due 04/17/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.08%
Debt instrument, maturity date Apr. 17, 2014
ProShares UltraShort DJ-UBS Crude Oil [Member] | U.S. Treasury Bills 0.093% Due 04/24/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.093%
Debt instrument, maturity date Apr. 24, 2014
ProShares UltraShort DJ-UBS Crude Oil [Member] | U.S. Treasury Bills 0.080% due 05/01/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.08% [1]
Debt instrument, maturity date May 01, 2014 [1]
ProShares UltraShort DJ-UBS Crude Oil [Member] | U.S. Treasury Bills 0.088% Due 05/08/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.088% [1]
Debt instrument, maturity date May 08, 2014 [1]
ProShares UltraShort DJ-UBS Crude Oil [Member] | U.S. Treasury Bills 0.034% due 05/22/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.034%
Debt instrument, maturity date May 22, 2014
ProShares UltraShort DJ-UBS Crude Oil [Member] | U.S.Treasury Bills 0.076% Due 06/05/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.076%
Debt instrument, maturity date Jun. 05, 2014
ProShares UltraShort DJ-UBS Crude Oil [Member] | U.S. Treasury Bills 0.043% Due 06/12/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.043%
Debt instrument, maturity date Jun. 12, 2014
ProShares UltraShort DJ-UBS Crude Oil [Member] | U.S. Treasury Bills 0.054% due 06/19/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.054%
Debt instrument, maturity date Jun. 19, 2014
ProShares UltraShort DJ-UBS Crude Oil [Member] | U.S. Treasury Bills 0.046% due 06/26/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.046% [1]
Debt instrument, maturity date Jun. 14, 2014 [1]
ProShares UltraShort DJ-UBS Crude Oil [Member] | U.S. Treasury Bills 0.049% Due 07/10/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.049% [1]
Debt instrument, maturity date Jul. 10, 2014 [1]
ProShares UltraShort DJ-UBS Crude Oil [Member] | U.S.Treasury Bills 0.056% due 08/07/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.056%
Debt instrument, maturity date Aug. 07, 2014
ProShares UltraShort DJ-UBS Crude Oil [Member] | U.S. Treasury Bills 0.068% Due 08/14/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.068% [1]
Debt instrument, maturity date Aug. 14, 2014 [1]
ProShares UltraShort DJ-UBS Crude Oil [Member] | U.S.Treasury Bills 0.071% Due 08/21/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.071% [1]
Debt instrument, maturity date Aug. 21, 2014 [1]
ProShares UltraShort DJ-UBS Crude Oil [Member] | U.S. Treasury Bills 0.071% Due 09/04/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.071% [1]
Debt instrument, maturity date Sep. 04, 2014 [1]
ProShares UltraShort DJ-UBS Natural Gas [Member]
  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 77.00%
Debt instrument, maturity date 56,750,896
ProShares UltraShort DJ-UBS Natural Gas [Member] | U.S. Treasury Bills 0.059% Due 04/10/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.059%
Debt instrument, maturity date Apr. 10, 2014
ProShares UltraShort DJ-UBS Natural Gas [Member] | U.S. Treasury Bills 0.075% Due 04/17/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.075%
Debt instrument, maturity date Apr. 17, 2014
ProShares UltraShort DJ-UBS Natural Gas [Member] | U.S. Treasury Bills 0.081% Due 05/01/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.081%
Debt instrument, maturity date May 01, 2014
ProShares UltraShort DJ-UBS Natural Gas [Member] | U.S. Treasury Bills 0.068% Due 05/08/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.068%
Debt instrument, maturity date May 08, 2014
ProShares UltraShort DJ-UBS Natural Gas [Member] | U.S.Treasury Bills 0.036% Due 05/22/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.036%
Debt instrument, maturity date Jun. 22, 2014
ProShares UltraShort DJ-UBS Natural Gas [Member] | U.S Treasury Bills 0.047% Due 06/12/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.047%
Debt instrument, maturity date Jun. 12, 2014
ProShares UltraShort DJ-UBS Natural Gas [Member] | U.S. Treasury Bills 0.049% Due 06/19/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.049%
Debt instrument, maturity date Jun. 19, 2014
ProShares UltraShort DJ-UBS Natural Gas [Member] | U.S.Treasury Bills 0.045% Due 06/26/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.045%
Debt instrument, maturity date Jun. 26, 2014
ProShares UltraShort DJ-UBS Natural Gas [Member] | U.S. Treasury Bills 0.050% Due 07/10/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.05%
Debt instrument, maturity date Jul. 10, 2014
ProShares UltraShort DJ-UBS Natural Gas [Member] | U.S. Treasury Bills 0.050% Due 08/07/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.05%
Debt instrument, maturity date Aug. 07, 2014
ProShares UltraShort DJ-UBS Natural Gas [Member] | U.S. Treasury Bills 0.067% Due 08/14/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.067%
Debt instrument, maturity date Aug. 14, 2014
ProShares UltraShort DJ-UBS Natural Gas [Member] | U.S. Treasury Bills 0.072% Due 08/21/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.072%
Debt instrument, maturity date Aug. 21, 2014
ProShares UltraShort Gold [Member]
  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 92.00%
Debt instrument, maturity date 105,836,793
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.070% Due 08/14/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.07% [2]
Debt instrument, maturity date Aug. 14, 2014 [2]
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.070% Due 04/03/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.07%
Debt instrument, maturity date Apr. 03, 2014
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.070% Due 05/01/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.07%
Debt instrument, maturity date May 01, 2014
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.075% Due 05/08/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.075% [2]
Debt instrument, maturity date May 08, 2014 [2]
ProShares UltraShort Gold [Member] | U.S. Treasury Bills Zero 0.054% Due 06/05/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.054% [2]
Debt instrument, maturity date Jun. 05, 2014 [2]
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.037% Due 06/12/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.037% [2]
Debt instrument, maturity date Jun. 12, 2014 [2]
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.070% Due 06/19/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.07% [2]
Debt instrument, maturity date Jun. 19, 2014 [2]
ProShares UltraShort Gold [Member] | U.S Treasury Bills 0.058% Due 08/07/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.058% [2]
Debt instrument, maturity date Aug. 07, 2014 [2]
ProShares UltraShort Silver [Member]
  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 95.00%
Debt instrument, maturity date 67,185,974
ProShares UltraShort Silver [Member] | U.S.Treasury Bills 0.045% Due 06/19/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.045% [2]
Debt instrument, maturity date Jun. 19, 2014 [2]
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.070% Due 08/14/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.07% [2]
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.043% Due 06/12/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.043%
Debt instrument, maturity date Jun. 12, 2014
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.081% Due 05/01/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.081% [2]
Debt instrument, maturity date May 01, 2014 [2]
ProShares UltraShort Silver [Member] | U.S Treasury Bills 0.058% Due 08/07/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.058% [2]
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.074% Due 04/17/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.074%
Debt instrument, maturity date Apr. 17, 2014
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.052% Due 05/22/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.052% [2]
Debt instrument, maturity date May 22, 2014 [2]
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.073% Due 08/21/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.073% [2]
ProShares Short Euro [Member]
  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 88.00%
Debt instrument, maturity date 6,226,796
ProShares Short Euro [Member] | U.S. Treasury Bills 0.046% Due 06/05/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.046%
Debt instrument, maturity date Jun. 05, 2014
ProShares Short Euro [Member] | U.S.Treasury Bills 0.045% Due 06/19/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.045%
Debt instrument, maturity date Jun. 19, 2014
ProShares Short Euro [Member] | U.S.Treasury Bills 0.071% Due 08/21/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.071%
Debt instrument, maturity date Aug. 21, 2014
ProShares Short Euro [Member] | U.S. Treasury Bills 0.086% Due 06/12/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.086%
Debt instrument, maturity date Jun. 12, 2014
ProShares UltraShort Australian Dollar [Member]
  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 91.00%
Debt instrument, maturity date 19,226,421
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 0.088% Due 05/08/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.088%
Debt instrument, maturity date May 08, 2014
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 0.073% Due 04/03/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.073%
Debt instrument, maturity date Apr. 03, 2014
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 0.066% Due 04/17/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.066%
Debt instrument, maturity date Apr. 17, 2014
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 0.085% Due 04/24/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.085%
Debt instrument, maturity date Apr. 24, 2014
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 0.076% Due 05/01/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.076%
Debt instrument, maturity date May 01, 2014
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 0.067% Due 05/22/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.067%
Debt instrument, maturity date May 22, 2014
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 0.045% Due 06/12/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.045%
Debt instrument, maturity date Jun. 12, 2014
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 0.045% Due 06/19/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.045%
Debt instrument, maturity date Jun. 19, 2014
ProShares UltraShort Euro [Member]
  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 101.00%
Debt instrument, maturity date 414,295,727
ProShares UltraShort Euro [Member] | U.S.Treasury Bills 0.071% Due 08/21/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.071% [3]
Debt instrument, maturity date Aug. 21, 2014 [3]
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.081% Due 05/01/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.081%
Debt instrument, maturity date May 01, 2014
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.050% Due 07/10/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.05% [3]
Debt instrument, maturity date Jul. 10, 2014 [3]
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.070% Due 04/03/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.07%
Debt instrument, maturity date Apr. 03, 2014
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.086% Due 06/12/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.086% [3]
Debt instrument, maturity date Jun. 12, 2014 [3]
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.083% Due 05/08/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.083% [3]
Debt instrument, maturity date May 08, 2014 [3]
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.066% Due 08/07/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.066%
Debt instrument, maturity date Aug. 07, 2014
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.061% Due 08/14/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.061%
Debt instrument, maturity date Aug. 14, 2014
ProShares UltraShort Yen [Member]
  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 99.00%
Debt instrument, maturity date 400,704,523
ProShares UltraShort Yen [Member] | U.S.Treasury Bills 0.076% Due 06/05/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.076%
Debt instrument, maturity date Jun. 05, 2014
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.050% Due 07/10/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.05% [3]
Debt instrument, maturity date Jul. 10, 2014 [3]
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.052% Due 05/22/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.052%
Debt instrument, maturity date May 22, 2014
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.086% Due 06/12/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.086% [3]
Debt instrument, maturity date Jun. 12, 2014 [3]
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.087% Due 04/17/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.087%
Debt instrument, maturity date Apr. 17, 2014
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.093% Due 04/24/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.093%
Debt instrument, maturity date May 01, 2014
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.086% Due 05/08/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.086% [3]
Debt instrument, maturity date May 08, 2014 [3]
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.061% Due 06/26/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.061% [3]
Debt instrument, maturity date Jun. 26, 2014 [3]
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.057% Due 08/07/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.057% [3]
Debt instrument, maturity date Aug. 07, 2014 [3]
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.070% Due 08/28/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.07% [3]
Debt instrument, maturity date Aug. 28, 2014 [3]
ProShares Ultra DJ-UBS Commodity [Member]
  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 73.00%
Debt instrument, maturity date 2,410,744
ProShares Ultra DJ-UBS Commodity [Member] | U.S.Treasury Bills 0.045% Due 06/19/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.045% [1]
Debt instrument, maturity date Jun. 19, 2014 [1]
ProShares Ultra DJ-UBS Commodity [Member] | U.S. Treasury Bills 0.081% Due 05/01/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.081% [1]
Debt instrument, maturity date May 01, 2014 [1]
ProShares Ultra DJ-UBS Commodity [Member] | U.S. Treasury Bills 0.066% Due 06/05/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.066% [1]
Debt instrument, maturity date Jun. 05, 2014 [1]
ProShares Ultra DJ-UBS Crude Oil [Member]
  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 110.00%
Debt instrument, maturity date 112,050,123
ProShares Ultra DJ-UBS Crude Oil [Member] | U.S. Treasury Bills 0.080% Due 04/17/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.08% [1]
Debt instrument, maturity date Apr. 17, 2014 [1]
ProShares Ultra DJ-UBS Crude Oil [Member] | U.S.Treasury Bills 0.076% Due 06/05/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.076%
Debt instrument, maturity date Jun. 05, 2014
ProShares Ultra DJ-UBS Crude Oil [Member] | U.S. Treasury Bills 0.049% Due 07/10/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.049% [1]
Debt instrument, maturity date Jul. 10, 2014 [1]
ProShares Ultra DJ-UBS Crude Oil [Member] | U.S. Treasury Bills 0.073% Due 04/03/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.073%
Debt instrument, maturity date Apr. 03, 2014
ProShares Ultra DJ-UBS Crude Oil [Member] | U.S. Treasury Bills 0.085% Due 04/24/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.085%
Debt instrument, maturity date Apr. 24, 2014
ProShares Ultra DJ-UBS Crude Oil [Member] | U.S. Treasury Bills 0.070% Due 08/28/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.07% [1]
Debt instrument, maturity date Aug. 28, 2014 [1]
ProShares Ultra DJ-UBS Crude Oil [Member] | U.S. Treasury Bills 0.077% Due 04/10/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.077%
Debt instrument, maturity date Apr. 10, 2014
ProShares Ultra DJ-UBS Crude Oil [Member] | U.S. Treasury Bills 0.082% Due 05/01/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.082% [1]
Debt instrument, maturity date May 01, 2014 [1]
ProShares Ultra DJ-UBS Crude Oil [Member] | U.S. Treasury Bills 0.035% Due 05/08/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.035% [1]
Debt instrument, maturity date May 08, 2014 [1]
ProShares Ultra DJ-UBS Crude Oil [Member] | U.S. Treasury Bills 0.037% Due 05/22/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.037% [1]
Debt instrument, maturity date May 22, 2014 [1]
ProShares Ultra DJ-UBS Crude Oil [Member] | U.S. Treasury Bills 0.035% Due 06/12/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.035% [1]
Debt instrument, maturity date Jun. 12, 2014 [1]
ProShares Ultra DJ-UBS Crude Oil [Member] | U.S. Treasury Bills 0.056% Due 06/19/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.056% [1]
Debt instrument, maturity date Jun. 19, 2014 [1]
ProShares Ultra DJ-UBS Crude Oil [Member] | U.S. Treasury Bills 0.035% Due 06/26/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.035%
Debt instrument, maturity date Jun. 26, 2014
ProShares Ultra DJ-UBS Crude Oil [Member] | U.S. Treasury Bills 0.060% Due 08/07/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.06% [1]
Debt instrument, maturity date Aug. 07, 2014 [1]
ProShares Ultra DJ-UBS Crude Oil [Member] | U.S. Treasury Bills 0.067% Due 08/21/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.067% [1]
Debt instrument, maturity date Aug. 21, 2014 [1]
ProShares Ultra DJ-UBS Natural Gas [Member]
  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 86.00%
Debt instrument, maturity date 18,277,464
ProShares Ultra DJ-UBS Natural Gas [Member] | U.S. Treasury Bills 0.061% Due 04/10/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.061%
Debt instrument, maturity date Apr. 10, 2014
ProShares Ultra DJ-UBS Natural Gas [Member] | U.S. Treasury Bills 0.080% Due 04/17/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.08%
Debt instrument, maturity date Apr. 17, 2014
ProShares Ultra DJ-UBS Natural Gas [Member] | U.S.Treasury Bills 0.076% Due 06/05/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.076%
Debt instrument, maturity date Jun. 05, 2014
ProShares Ultra DJ-UBS Natural Gas [Member] | U.S. Treasury Bills 0.049% Due 07/10/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.049%
Debt instrument, maturity date Jul. 10, 2014
ProShares Ultra DJ-UBS Natural Gas [Member] | U.S. Treasury Bills 0.093% Due 04/24/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.093%
Debt instrument, maturity date May 01, 2014
ProShares Ultra DJ-UBS Natural Gas [Member] | U.S. Treasury Bills 0.057% Due 08/07/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.057%
Debt instrument, maturity date Aug. 07, 2014
ProShares Ultra DJ-UBS Natural Gas [Member] | U.S. Treasury Bills 0.035% Due 05/08/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.035%
Debt instrument, maturity date May 08, 2014
ProShares Ultra DJ-UBS Natural Gas [Member] | U.S.Treasury Bills 0.074% Due 04/03/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.074%
Debt instrument, maturity date Apr. 03, 2014
ProShares Ultra DJ-UBS Natural Gas [Member] | U.S. Treasury Bills 0.082% Due 04/24/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.082%
Debt instrument, maturity date Apr. 24, 2014
ProShares Ultra DJ-UBS Natural Gas [Member] | U.S. Treasury Bills 0.058% Due 05/22/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.058%
Debt instrument, maturity date May 22, 2014
ProShares Ultra DJ-UBS Natural Gas [Member] | U.S. Treasury Bills 0.048% Due 06/12/1 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.048%
Debt instrument, maturity date Jun. 12, 2014
ProShares Ultra DJ-UBS Natural Gas [Member] | U.S. Treasury Bills 0.073% Due 08/14/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.073%
Debt instrument, maturity date Aug. 14, 2014
ProShares Ultra Gold [Member]
  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 109.00%
Debt instrument, maturity date 148,333,041
ProShares Ultra Gold [Member] | U.S. Treasury Bills 0.046% Due 06/05/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.046%
Debt instrument, maturity date Jun. 05, 2014
ProShares Ultra Gold [Member] | U.S.Treasury Bills 0.045% Due 06/19/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.045% [2]
Debt instrument, maturity date Jun. 19, 2014 [2]
ProShares Ultra Gold [Member] | U.S. Treasury Bills 0.080% Due 04/17/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.08% [2]
Debt instrument, maturity date Apr. 17, 2014 [2]
ProShares Ultra Gold [Member] | U.S. Treasury Bills 0.086% Due 06/12/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.086%
Debt instrument, maturity date Jun. 12, 2014
ProShares Ultra Gold [Member] | U.S. Treasury Bills 0.057% Due 08/07/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.057% [2]
Debt instrument, maturity date Aug. 07, 2014 [2]
ProShares Ultra Gold [Member] | U.S. Treasury Bills 0.070% Due 08/28/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.07% [2]
Debt instrument, maturity date Aug. 24, 2014 [2]
ProShares Ultra Gold [Member] | U.S. Treasury Bills 0.070% Due 05/22/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.07% [2]
Debt instrument, maturity date May 22, 2014 [2]
ProShares Ultra Silver [Member]
  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 110.00%
Debt instrument, maturity date 530,685,172
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.046% Due 06/05/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.046%
Debt instrument, maturity date Jun. 05, 2014
ProShares Ultra Silver [Member] | U.S.Treasury Bills 0.045% Due 06/19/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.045% [2]
Debt instrument, maturity date Jun. 19, 2014 [2]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.070% Due 08/14/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.07% [2]
Debt instrument, maturity date Aug. 14, 2014 [2]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.080% Due 04/17/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.08% [2]
Debt instrument, maturity date Apr. 17, 2014 [2]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.093% Due 04/24/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.093% [2]
Debt instrument, maturity date Apr. 24, 2014 [2]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.088% Due 05/08/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.088% [2]
Debt instrument, maturity date May 08, 2014 [2]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.071% Due 09/04/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.071% [2]
Debt instrument, maturity date Sep. 04, 2014 [2]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.070% Due 04/03/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.07%
Debt instrument, maturity date Apr. 03, 2014
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.093% Due 04/24/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.093%
Debt instrument, maturity date May 01, 2014
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.070% Due 08/28/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.07% [2]
Debt instrument, maturity date Aug. 28, 2014 [2]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.066% Due 04/10/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.066% [2]
Debt instrument, maturity date Apr. 10, 2014 [2]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.033% due 05/22/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.033% [2]
Debt instrument, maturity date May 22, 2014 [2]
ProShares Ultra Silver [Member] | U.S.Treasury Bills 0.046% due 07/10/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.046% [2]
Debt instrument, maturity date Jul. 10, 2014 [2]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.067% due 08/07/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.067% [2]
Debt instrument, maturity date Aug. 07, 2014 [2]
ProShares Ultra Australian Dollar [Member]
  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 81.00%
Debt instrument, maturity date 2,775,556
ProShares Ultra Australian Dollar [Member] | U.S. Treasury Bills 0.046% Due 06/05/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.046%
Debt instrument, maturity date Jun. 05, 2014
ProShares Ultra Australian Dollar [Member] | U.S. Treasury Bills 0.086% Due 06/12/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.086%
Debt instrument, maturity date Jun. 12, 2014
ProShares Ultra Australian Dollar [Member] | U.S. Treasury Bills 0.065% Due 04/17/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.065%
Debt instrument, maturity date Apr. 17, 2014
ProShares Ultra Euro [Member]
  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 89.00%
Debt instrument, maturity date 2,307,628
ProShares Ultra Euro [Member] | U.S.Treasury Bills 0.045% Due 06/19/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.045% [3]
Debt instrument, maturity date Jun. 19, 2014 [3]
ProShares Ultra Euro [Member] | U.S. Treasury Bills 0.060% Due 08/07/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.06%
Debt instrument, maturity date Aug. 07, 2014
ProShares Ultra Euro [Member] | U.S. Treasury Bills 0.061% Due 06/05/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.061% [3]
Debt instrument, maturity date Jun. 05, 2014 [3]
ProShares Ultra Yen [Member]
  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 85.00%
Debt instrument, maturity date 2,471,639
ProShares Ultra Yen [Member] | U.S.Treasury Bills 0.045% Due 06/19/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.045%
Debt instrument, maturity date Jun. 19, 2014
ProShares Ultra Yen [Member] | U.S.Treasury Bills 0.045% Due 06/26/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.045%
Debt instrument, maturity date Jun. 26, 2014
ProShares Ultra Yen [Member] | U.S. Treasury Bills 0.050% Due 07/10/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.05% [3]
Debt instrument, maturity date Jul. 10, 2014 [3]
ProShares Ultra Yen [Member] | U.S. Treasury Bills 0.086% Due 06/12/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.086% [3]
Debt instrument, maturity date Jun. 12, 2014 [3]
ProShares VIX Short-Term Futures ETF [Member]
  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 80.00%
Debt instrument, maturity date 94,147,330
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.046% Due 06/05/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.046%
Debt instrument, maturity date Jun. 05, 2014
ProShares VIX Short-Term Futures ETF [Member] | U,.S. Treasury Bills 0.075% Due 04/03/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.075%
Debt instrument, maturity date Apr. 03, 2014
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.068% Due 05/08/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.068%
Debt instrument, maturity date May 08, 2014
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.045% Due 06/12/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.045%
Debt instrument, maturity date Jun. 12, 2014
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.035% Due 06/26/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.035%
Debt instrument, maturity date Jun. 26, 2014
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.067% Due 08/21/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.067%
Debt instrument, maturity date Aug. 21, 2014
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.082% Due 04/24/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.082%
Debt instrument, maturity date Apr. 24, 2014
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.067% Due 04/10/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.067%
Debt instrument, maturity date Apr. 10, 2014
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.077% Due 04/17/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.077%
Debt instrument, maturity date Apr. 17, 2014
ProShares VIX Short-Term Futures ETF [Member] | U.S Treasury Bills 0.048% Due 07/10/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.048%
Debt instrument, maturity date Jul. 10, 2014
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.055% Due 08/07/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.055%
Debt instrument, maturity date Aug. 07, 2014
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.069% Due 08/14/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.069%
Debt instrument, maturity date Aug. 14, 2014
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.066% Due 09/04/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.066%
Debt instrument, maturity date Sep. 04, 2014
ProShares VIX Mid-Term Futures ETF [Member]
  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 84.00%
Debt instrument, maturity date 48,694,338
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.071% Due 09/04/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.071%
Debt instrument, maturity date Sep. 04, 2014
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.050% Due 07/10/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.05%
Debt instrument, maturity date Jul. 10, 2014
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.066% Due 04/17/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.066%
Debt instrument, maturity date Apr. 17, 2014
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.045% Due 06/12/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.045%
Debt instrument, maturity date Jun. 12, 2014
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.086% Due 05/08/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.086%
Debt instrument, maturity date May 08, 2014
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.057% Due 08/07/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.057%
Debt instrument, maturity date Aug. 07, 2014
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.067% Due 08/21/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.067%
Debt instrument, maturity date Aug. 21, 2014
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.069% Due 08/14/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.069%
Debt instrument, maturity date Aug. 14, 2014
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.071% Due 04/10/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.071%
Debt instrument, maturity date Apr. 10, 2014
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.077% Due 05/01/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.077%
Debt instrument, maturity date May 01, 2014
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.045% Due 05/22/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.045%
Debt instrument, maturity date May 22, 2014
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.037% Due 06/26/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.037%
Debt instrument, maturity date Jun. 26, 2014
ProShares Ultra VIX Short-Term Futures ETF [Member]
  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 55.00%
Debt instrument, maturity date 173,848,340
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S.Treasury Bills 0.045% Due 06/19/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.045%
Debt instrument, maturity date Jun. 19, 2014
ProShares Ultra VIX Short-Term Futures ETF [Member] | U,.S. Treasury Bills 0.075% Due 04/03/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.075%
Debt instrument, maturity date Apr. 03, 2014
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.087% Due 04/17/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.087%
Debt instrument, maturity date Apr. 17, 2014
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.035% Due 06/26/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.035%
Debt instrument, maturity date Jun. 26, 2014
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.069% Due 08/14/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.069%
Debt instrument, maturity date Aug. 14, 2014
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.068% Due 04/10/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.068%
Debt instrument, maturity date Apr. 10, 2014
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.091% Due 05/08/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.091%
Debt instrument, maturity date May 08, 2014
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.054% Due 08/07/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.054%
Debt instrument, maturity date Aug. 07, 2014
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.063% Due 09/04/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.063%
Debt instrument, maturity date Sep. 04, 2014
ProShares Short VIX Short-Term Futures ETF [Member]
  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 79.00%
Debt instrument, maturity date $ 169,484,257
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.043% Due 06/12/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.043%
Debt instrument, maturity date Jun. 12, 2014
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.046% due 06/26/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.046%
Debt instrument, maturity date Jun. 26, 2014
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.068% Due 08/14/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.068%
Debt instrument, maturity date Aug. 14, 2014
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.081% Due 05/01/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.081%
Debt instrument, maturity date May 01, 2014
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.049% Due 06/19/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.049%
Debt instrument, maturity date Jun. 19, 2014
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.050% Due 07/10/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.05%
Debt instrument, maturity date Jul. 10, 2014
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.073% Due 04/03/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.073%
Debt instrument, maturity date Apr. 03, 2014
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.070% Due 08/28/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.07%
Debt instrument, maturity date Aug. 28, 2014
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.068% Due 04/10/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.068%
Debt instrument, maturity date Apr. 10, 2014
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.070% Due 04/17/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.07%
Debt instrument, maturity date Apr. 17, 2014
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.084% Due 04/24/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.084%
Debt instrument, maturity date Apr. 24, 2014
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.047% Due 05/08/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.047%
Debt instrument, maturity date May 08, 2014
ProShares Short VIX Short-Term Futures ETF [Member] | US Treasury Bills 0.059% Due 05/22/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.059%
Debt instrument, maturity date May 22, 2014
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.053% due 08/07/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.053%
Debt instrument, maturity date Aug. 07, 2014
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.069% due 08/21/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.069%
Debt instrument, maturity date Aug. 21, 2014
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.061% Due 09/04/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.061%
Debt instrument, maturity date Sep. 04, 2014
[1] All or partial amount pledged as collateral for swap agreements.
[2] All or partial amount pledged as collateral for forward agreements.
[3] All or partial amount pledged as collateral for foreign currency forward contracts.