v2.4.0.8
Schedule of Investments - Short-Term U.S. Government and Agency Obligations (Parenthetical) (Detail) (USD $)
 6 Months Ended
Jun. 30, 2014
ProShares UltraShort Bloomberg Commodity [Member]
  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 91.00%
Total short-term U.S. government and agency obligations, cost $ 2,975,653
ProShares UltraShort Bloomberg 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 Bloomberg Commodity [Member] | U.S. Treasury Bills 0.037% Due 10/23/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.037% [1]
Debt instrument, maturity date Oct. 23, 2014 [1]
ProShares UltraShort Bloomberg Commodity [Member] | U.S. Treasury Bills 0.036% Due 11/13/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.036%
Debt instrument, maturity date Nov. 13, 2014
ProShares UltraShort Bloomberg Crude Oil [Member]
  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 101.00%
Total short-term U.S. government and agency obligations, cost 364,432,294
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.037% Due 10/23/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.037% [1]
Debt instrument, maturity date Oct. 23, 2014 [1]
ProShares UltraShort Bloomberg Crude Oil [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 UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.044% Due 08/07/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.044%
Debt instrument, maturity date Aug. 07, 2014
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.046% Due 08/14/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.046% [1]
Debt instrument, maturity date Aug. 14, 2014 [1]
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.044% Due 08/21/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.044% [1]
Debt instrument, maturity date Aug. 21, 2014 [1]
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.032% Due 08/28/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.032% [1]
Debt instrument, maturity date Aug. 28, 2014 [1]
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.040% Due 09/04/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.04% [1]
Debt instrument, maturity date Sep. 04, 2014 [1]
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.036% Due 09/11/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.036% [1]
Debt instrument, maturity date Sep. 11, 2014 [1]
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.034% Due 09/18/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.034% [1]
Debt instrument, maturity date Sep. 18, 2014 [1]
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.027% Due 09/25/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.027% [1]
Debt instrument, maturity date Sep. 25, 2014 [1]
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.036% Due 11/06/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.036%
Debt instrument, maturity date Nov. 06, 2014
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.046% Due 11/13/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.046%
Debt instrument, maturity date Nov. 13, 2014
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.045% Due 11/20/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.045% [1]
Debt instrument, maturity date Nov. 20, 2014 [1]
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.042% Due 12/11/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.042% [1]
Debt instrument, maturity date Dec. 11, 2014 [1]
ProShares UltraShort Bloomberg Natural Gas [Member]
  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 89.00%
Total short-term U.S. government and agency obligations, cost 44,128,238
ProShares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.027% Due 09/25/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.027%
Debt instrument, maturity date Sep. 25, 2014
ProShares UltraShort Bloomberg 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 Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.042% Due 08/07/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.042%
Debt instrument, maturity date Aug. 07, 2014
ProShares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.035% Due 08/14/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.035%
Debt instrument, maturity date Aug. 14, 2014
ProShares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.063% Due 08/21/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.063%
Debt instrument, maturity date Aug. 21, 2014
ProShares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.035% Due 09/11/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.035%
Debt instrument, maturity date Sep. 11, 2014
ProShares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.026% Due 09/18/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.026%
Debt instrument, maturity date Sep. 18, 2014
ProShares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.035% Due 10/23/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.035%
Debt instrument, maturity date Oct. 23, 2014
ProShares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.038% Due 11/06/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.038%
Debt instrument, maturity date Nov. 06, 2014
ProShares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.033% Due 11/13/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.033%
Debt instrument, maturity date Nov. 13, 2014
ProShares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.045% Due 11/20/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.045%
Debt instrument, maturity date Nov. 20, 2014
ProShares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.034% Due 12/11/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.034%
Debt instrument, maturity date Dec. 11, 2014
ProShares UltraShort Gold [Member]
  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 112.00%
Total short-term U.S. government and agency obligations, cost 94,198,546
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 0.045% Due 11/20/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.045% [2]
Debt instrument, maturity date Nov. 20, 2014 [2]
ProShares UltraShort 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 UltraShort Gold [Member] | U.S. Treasury Bills 0.039% Due 08/21/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.039% [2]
Debt instrument, maturity date Aug. 21, 2014 [2]
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.039% Due 08/28/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.039% [2]
Debt instrument, maturity date Aug. 28, 2014 [2]
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.032% Due 09/04/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.032%
Debt instrument, maturity date Sep. 04, 2014
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.025% Due 09/18/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.025% [2]
Debt instrument, maturity date Sep. 18, 2014 [2]
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.037% Due 11/13/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.037% [2]
Debt instrument, maturity date Nov. 13, 2014 [2]
ProShares UltraShort Silver [Member]
  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 120.00%
Total short-term U.S. government and agency obligations, cost 62,533,634
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]
Debt instrument, maturity date Aug. 14, 2014 [2]
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.037% Due 10/23/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.037%
Debt instrument, maturity date Oct. 23, 2014
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.045% Due 11/20/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.045% [2]
Debt instrument, maturity date Nov. 20, 2014 [2]
ProShares UltraShort Silver [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 UltraShort Silver [Member] | U.S. Treasury Bills 0.073% Due 08/21/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.073% [2]
Debt instrument, maturity date Aug. 21, 2014 [2]
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.033% Due 08/28/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.033% [2]
Debt instrument, maturity date Aug. 28, 2014 [2]
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.029% Due 09/11/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.029% [2]
Debt instrument, maturity date Sep. 11, 2014 [2]
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.039% Due 11/06/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.039%
Debt instrument, maturity date Nov. 06, 2014
ProShares UltraShort Silver [Member] | U.S Treasury Bills 0.052% Due 12/11/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.052% [2]
Debt instrument, maturity date Dec. 11, 2014 [2]
ProShares Short Euro [Member]
  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 90.00%
Total short-term U.S. government and agency obligations, cost 12,789,830
ProShares Short Euro [Member] | U.S. Treasury Bills 0.036% Due 11/13/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.036%
Debt instrument, maturity date Nov. 13, 2014
ProShares Short Euro [Member] | U.S. Treasury Bills 0.045% Due 11/20/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.045%
Debt instrument, maturity date Nov. 20, 2014
ProShares Short Euro [Member] | U.S. Treasury Bills 0.039% Due 11/06/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.039%
Debt instrument, maturity date Nov. 06, 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 0.031% Due 09/04/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.031%
Debt instrument, maturity date Sep. 04, 2014
ProShares Short Euro [Member] | U.S. Treasury Bills 0.034% Due 09/11/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.034%
Debt instrument, maturity date Sep. 11, 2014
ProShares UltraShort Australian Dollar [Member]
  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 88.00%
Total short-term U.S. government and agency obligations, cost 17,768,447
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 0.027% Due 09/25/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.027%
Debt instrument, maturity date Sep. 25, 2014
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 0.035% Due 10/23/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.035%
Debt instrument, maturity date Oct. 23, 2014
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 0.029% Due 09/11/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.029%
Debt instrument, maturity date Sep. 11, 2014
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 0.048% Due 12/11/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.048%
Debt instrument, maturity date Dec. 11, 2014
ProShares UltraShort Euro [Member]
  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 101.00%
Total short-term U.S. government and agency obligations, cost 445,858,348
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.027% Due 09/25/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.027% [3]
Debt instrument, maturity date Sep. 25, 2014 [3]
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 0.035% Due 10/23/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.035% [3]
Debt instrument, maturity date Oct. 23, 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 Euro [Member] | U.S. Treasury Bills 0.060% Due 08/21/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.06% [3]
Debt instrument, maturity date Aug. 21, 2014 [3]
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.024% Due 08/28/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.024%
Debt instrument, maturity date Aug. 28, 2014
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.029% Due 10/09/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.029% [3]
Debt instrument, maturity date Oct. 09, 2014 [3]
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.037% Due 11/06/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.037% [3]
Debt instrument, maturity date Nov. 06, 2014 [3]
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.040% Due 11/13/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.04% [3]
Debt instrument, maturity date Nov. 13, 2014 [3]
ProShares UltraShort Yen [Member]
  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 103.00%
Total short-term U.S. government and agency obligations, cost 363,182,251
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.027% Due 09/25/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.027% [3]
Debt instrument, maturity date Sep. 25, 2014 [3]
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 0.045% Due 11/20/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.045% [3]
Debt instrument, maturity date Nov. 20, 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 0.031% Due 09/04/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.031%
Debt instrument, maturity date Sep. 04, 2014
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.029% Due 10/09/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.029% [3]
Debt instrument, maturity date Oct. 09, 2014 [3]
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.044% Due 08/28/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.044% [3]
Debt instrument, maturity date Aug. 28, 2014 [3]
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.028% Due 09/18/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.028% [3]
Debt instrument, maturity date Sep. 18, 2014 [3]
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.048% Due 11/06/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.048%
Debt instrument, maturity date Nov. 06, 2014
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.045% Due 11/13/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.045% [3]
Debt instrument, maturity date Nov. 13, 2014 [3]
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.030% Due 12/11/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.03% [3]
Debt instrument, maturity date Dec. 11, 2014 [3]
ProShares Ultra Bloomberg Commodity [Member]
  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 72.00%
Total short-term U.S. government and agency obligations, cost 3,166,718
ProShares Ultra Bloomberg Commodity [Member] | U.S. Treasury Bills 0.036% Due 11/13/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.036% [1]
Debt instrument, maturity date Nov. 13, 2014 [1]
ProShares Ultra Bloomberg Commodity [Member] | U.S. Treasury Bills 0.031% Due 09/04/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.031%
Debt instrument, maturity date Sep. 04, 2014
ProShares Ultra Bloomberg Commodity [Member] | U.S. Treasury Bills 0.041% Due 09/11/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.041% [1]
Debt instrument, maturity date Sep. 11, 2014 [1]
ProShares Ultra Bloomberg Crude Oil [Member]
  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 95.00%
Total short-term U.S. government and agency obligations, cost 92,958,183
ProShares Ultra Bloomberg 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 Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.040% Due 09/04/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.04% [1]
Debt instrument, maturity date Sep. 04, 2014 [1]
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.036% Due 11/06/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.036% [1]
Debt instrument, maturity date Nov. 06, 2014 [1]
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.045% Due 11/20/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.045% [1]
Debt instrument, maturity date Nov. 20, 2014 [1]
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.025% Due 09/18/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.025% [1]
Debt instrument, maturity date Sep. 18, 2014 [1]
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.048% Due 12/11/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.048% [1]
Debt instrument, maturity date Dec. 11, 2014 [1]
ProShares Ultra Bloomberg 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 Bloomberg 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 Bloomberg 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 Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.026% Due 09/11/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.026% [1]
Debt instrument, maturity date Sep. 11, 2014 [1]
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.031% Due 10/23/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.031%
Debt instrument, maturity date Oct. 23, 2014
ProShares Ultra Bloomberg Natural Gas [Member]
  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 73.00%
Total short-term U.S. government and agency obligations, cost 15,519,408
ProShares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.040% Due 09/04/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.04%
Debt instrument, maturity date Sep. 04, 2014
ProShares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.035% Due 09/11/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.035%
Debt instrument, maturity date Sep. 11, 2014
ProShares Ultra Bloomberg 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 Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.039% Due 08/28/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.039%
Debt instrument, maturity date Aug. 28, 2014
ProShares Ultra Bloomberg Natural Gas [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 Ultra Bloomberg 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 Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.036% Due 10/23/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.036%
Debt instrument, maturity date Oct. 23, 2014
ProShares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.040% Due 11/06/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.04%
Debt instrument, maturity date Nov. 06, 2014
ProShares Ultra Gold [Member]
  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 90.00%
Total short-term U.S. government and agency obligations, cost 122,189,443
ProShares Ultra Gold [Member] | U.S. Treasury Bills 0.027% Due 09/25/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.027% [2]
Debt instrument, maturity date Sep. 25, 2014 [2]
ProShares Ultra Gold [Member] | U.S. Treasury Bills 0.035% Due 10/23/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.035% [2]
Debt instrument, maturity date Oct. 23, 2014 [2]
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 0.031% Due 09/04/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.031%
Debt instrument, maturity date Sep. 04, 2014
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. 28, 2014 [2]
ProShares Ultra Gold [Member] | U.S. Treasury Bills 0.038% Due 09/18/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.038% [2]
Debt instrument, maturity date Sep. 18, 2014 [2]
ProShares Ultra Gold [Member] | U.S. Treasury Bills 0.046% Due 12/11/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.046% [2]
Debt instrument, maturity date Dec. 11, 2014 [2]
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 83.00%
Total short-term U.S. government and agency obligations, cost 150,294,074
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.027% Due 09/25/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.027%
Debt instrument, maturity date Sep. 25, 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 0.035% Due 09/11/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.035%
Debt instrument, maturity date Sep. 11, 2014
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.045% Due 11/20/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.045%
Debt instrument, maturity date Nov. 20, 2014
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.029% Due 10/09/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.029%
Debt instrument, maturity date Oct. 09, 2014
ProShares Short VIX Short-Term Futures ETF [Member] | US Treasury Bills 0.040% Due 08/07/2014 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.04%
Debt instrument, maturity date Aug. 07, 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] | US Treasury Bills 0.035% Due 08/21/2014 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.035%
Debt instrument, maturity date Aug. 21, 2014
ProShares Short VIX Short-Term Futures ETF [Member] | US Treasury Bills 0.034% Due 08/28/2014 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.034%
Debt instrument, maturity date Aug. 28, 2014
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.029% Due 09/18/2014 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.029%
Debt instrument, maturity date Sep. 18, 2014
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.030% due 10/23/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.03%
Debt instrument, maturity date Oct. 23, 2014
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.035% due 11/06/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.035%
Debt instrument, maturity date Nov. 06, 2014
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.026% Due 11/13/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.026%
Debt instrument, maturity date Nov. 13, 2014
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.049% Due 12/11/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.049%
Debt instrument, maturity date Dec. 11, 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 60.00%
Total short-term U.S. government and agency obligations, cost 177,917,757
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.037% Due 10/23/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.037%
Debt instrument, maturity date Oct. 23, 2014
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.046% Due 11/13/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.046%
Debt instrument, maturity date Nov. 13, 2014
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.035% Due 08/14/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.035%
Debt instrument, maturity date Aug. 14, 2014
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.035% Due 09/11/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.035%
Debt instrument, maturity date Sep. 11, 2014
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.045% Due 11/20/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.045%
Debt instrument, maturity date Nov. 20, 2014
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.039% Due 08/21/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.039%
Debt instrument, maturity date Aug. 21, 2014
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.048% Due 11/06/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.048%
Debt instrument, maturity date Nov. 06, 2014
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.030% Due 12/11/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.03%
Debt instrument, maturity date Dec. 11, 2014
ProShares Ultra 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 Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.030% due 08/28/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.03%
Debt instrument, maturity date Aug. 28, 2014
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S Treasury Bills 0.039% Due 09/04/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.039%
Debt instrument, maturity date Sep. 04, 2014
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S Treasury Bills 0.037% Due 09/18/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.037%
Debt instrument, maturity date Sep. 18, 2014
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S Treasury Bills 0.026% Due 09/25/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.026%
Debt instrument, maturity date Sep. 25, 2014
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S Treasury Bills 0.033% Due 01/08/15 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.033%
Debt instrument, maturity date Jan. 08, 2015
ProShares VIX Mid-Term Futures ETF [Member]
  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 85.00%
Total short-term U.S. government and agency obligations, cost 34,381,059
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.036% Due 11/13/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.036%
Debt instrument, maturity date Nov. 13, 2014
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.027% Due 09/25/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.027%
Debt instrument, maturity date Sep. 25, 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 0.045% Due 11/20/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.045%
Debt instrument, maturity date Nov. 20, 2014
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.034% Due 12/11/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.034%
Debt instrument, maturity date Dec. 11, 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 0.039% Due 08/28/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.039%
Debt instrument, maturity date Aug. 28, 2014
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.031% Due 09/04/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.031%
Debt instrument, maturity date Sep. 04, 2014
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.029% Due 10/09/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.029%
Debt instrument, maturity date Oct. 09, 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 0.036% Due 10/23/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.036%
Debt instrument, maturity date Oct. 23, 2014
ProShares VIX Mid-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 VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.038% Due 09/11/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.038%
Debt instrument, maturity date Sep. 11, 2014
ProShares Ultra Silver [Member]
  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 85.00%
Total short-term U.S. government and agency obligations, cost 424,513,295
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 0.036% Due 11/13/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.036% [2]
Debt instrument, maturity date Nov. 13, 2014 [2]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.038% Due 11/06/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.038% [2]
Debt instrument, maturity date Nov. 06, 2014 [2]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.025% Due 09/18/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.025%
Debt instrument, maturity date Sep. 18, 2014
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.031% Due 09/04/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.031% [2]
Debt instrument, maturity date Sep. 04, 2014 [2]
ProShares Ultra Silver [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 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 0.036% Due 10/23/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.036% [2]
Debt instrument, maturity date Oct. 23, 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%
Debt instrument, maturity date Jul. 10, 2014
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.040% Due 08/21/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.04% [2]
Debt instrument, maturity date Aug. 21, 2014 [2]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.030% Due 09/11/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.03% [2]
Debt instrument, maturity date Sep. 11, 2014 [2]
ProShares Ultra Australian Dollar [Member]
  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 86.00%
Total short-term U.S. government and agency obligations, cost 3,087,469
ProShares Ultra Australian Dollar [Member] | U.S. Treasury Bills 0.037% Due 10/23/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.037%
Debt instrument, maturity date Oct. 23, 2014
ProShares Ultra Australian Dollar [Member] | U.S. Treasury Bills 0.045% Due 11/20/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.045%
Debt instrument, maturity date Nov. 20, 2014
ProShares Ultra Euro [Member]
  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 97.00%
Total short-term U.S. government and agency obligations, cost 2,486,757
ProShares Ultra Euro [Member] | U.S. Treasury Bills 0.037% Due 10/23/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.037% [3]
Debt instrument, maturity date Oct. 23, 2014 [3]
ProShares Ultra Euro [Member] | U.S. Treasury Bills 0.036% Due 11/13/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.036%
Debt instrument, maturity date Nov. 13, 2014
ProShares Ultra Euro [Member] | U.S. Treasury Bills 0.060% Due 08/07/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.06% [3]
Debt instrument, maturity date Aug. 07, 2014 [3]
ProShares Ultra Yen [Member]
  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 74.00%
Total short-term U.S. government and agency obligations, cost 1,479,851
ProShares Ultra Yen [Member] | U.S. Treasury Bills 0.037% Due 10/23/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.037% [3]
Debt instrument, maturity date Oct. 23, 2014 [3]
ProShares Ultra Yen [Member] | U.S. Treasury Bills 0.036% Due 11/13/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.036%
Debt instrument, maturity date Nov. 13, 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 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%
Total short-term U.S. government and agency obligations, cost $ 77,583,175
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.035% Due 08/14/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.035%
Debt instrument, maturity date Aug. 14, 2014
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.035% Due 09/11/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.035%
Debt instrument, maturity date Sep. 11, 2014
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.045% Due 11/20/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.045%
Debt instrument, maturity date Nov. 20, 2014
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.039% Due 08/28/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.039%
Debt instrument, maturity date Aug. 28, 2014
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.048% Due 11/06/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.048%
Debt instrument, maturity date Nov. 06, 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 0.048% 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 0.026% Due 09/25/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.026%
Debt instrument, maturity date Sep. 25, 2014
ProShares VIX Short-Term Futures ETF [Member] | U.S Treasury Bills 0.033% Due 01/08/15 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.033%
Debt instrument, maturity date Jan. 08, 2015
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 0.036% Due 09/04/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.036%
Debt instrument, maturity date Sep. 04, 2014
ProShares VIX Short-Term Futures ETF [Member] | U.S Treasury Bills 0.040% Due 09/18/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.04%
Debt instrument, maturity date Sep. 18, 2014
ProShares VIX Short-Term Futures ETF [Member] | U.S Treasury Bills 0.033% Due 10/23/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.033%
Debt instrument, maturity date Oct. 23, 2014
ProShares VIX Short-Term Futures ETF [Member] | U.S Treasury Bills 0.044% Due 11/13/14 [Member]
  
Schedule of Investments [Line Items]  
Interest rate 0.044%
Debt instrument, maturity date Nov. 13, 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.