v3.8.0.1
Schedule of Investments - Short-Term U.S. Government and Agency Obligations (Parenthetical) (Detail)
 9 Months Ended
Sep. 30, 2017
USD ($)
Schedule of Investments [Line Items]  
Total short-term U.S. government and agency obligations, cost $ 3,181,464,501
ProShares VIX Short-Term Futures ETF [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 98.00%
Total short-term U.S. government and agency obligations, cost $ 186,708,857
ProShares VIX Mid-Term Futures ETF [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 80.00%
Total short-term U.S. government and agency obligations, cost $ 35,953,365
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 74.00%
Total short-term U.S. government and agency obligations, cost $ 770,073,989
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 97.00%
Total short-term U.S. government and agency obligations, cost $ 521,285,333
ProShares UltraShort Bloomberg Crude Oil [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 104.00%
Total short-term U.S. government and agency obligations, cost $ 246,653,071
ProShares UltraShort Bloomberg Natural Gas [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 51.00%
Total short-term U.S. government and agency obligations, cost $ 2,998,485
ProShares UltraShort Gold [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 99.00%
Total short-term U.S. government and agency obligations, cost $ 34,939,314
ProShares UltraShort Silver [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 78.00%
Total short-term U.S. government and agency obligations, cost $ 17,965,709
ProShares Short Euro [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 $ 5,998,008
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 $ 7,997,344
ProShares UltraShort 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 $ 219,674,153
ProShares UltraShort Yen [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 93.00%
Total short-term U.S. government and agency obligations, cost $ 137,812,663
ProShares Ultra Bloomberg Crude Oil [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 $ 562,320,399
ProShares Ultra Bloomberg Natural Gas [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 84.00%
Total short-term U.S. government and agency obligations, cost $ 42,918,384
ProShares Ultra Gold [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 114.00%
Total short-term U.S. government and agency obligations, cost $ 101,893,747
ProShares Ultra Silver [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 111.00%
Total short-term U.S. government and agency obligations, cost $ 270,613,725
ProShares Ultra Euro [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 80.00%
Total short-term U.S. government and agency obligations, cost $ 10,995,458
ProShares Ultra Yen [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 80.00%
Total short-term U.S. government and agency obligations, cost $ 4,662,497
U.S. Treasury Bills 0.998% due 10/05/17 [Member] | ProShares VIX Short-Term Futures ETF [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 0.998% [1]
Debt instrument, maturity date Oct. 05, 2017 [1]
U.S. Treasury Bills 0.998% due 10/05/17 [Member] | ProShares UltraShort Euro [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 0.998% [1]
Debt instrument, maturity date Oct. 05, 2017 [1]
U.S. Treasury Bills 0.998% due 10/05/17 [Member] | ProShares UltraShort Yen [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 0.998% [1]
Debt instrument, maturity date Oct. 05, 2017 [1]
U.S. Treasury Bills 1.043% due 10/12/17 [Member] | ProShares VIX Short-Term Futures ETF [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.043% [1]
Debt instrument, maturity date Oct. 12, 2017 [1]
U.S. Treasury Bills 0.928% due 10/19/17 [Member] | ProShares VIX Short-Term Futures ETF [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 0.928% [1]
Debt instrument, maturity date Oct. 19, 2017 [1]
U.S. Treasury Bills 1.037% due 10/26/17 [Member] | ProShares VIX Short-Term Futures ETF [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.037% [1],[2]
Debt instrument, maturity date Oct. 26, 2017 [1],[2]
U.S. Treasury Bills 1.013% due 11/02/17 [Member] | ProShares VIX Short-Term Futures ETF [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.013% [1],[2]
Debt instrument, maturity date Nov. 02, 2017 [1],[2]
U.S. Treasury Bills 1.013% due 11/02/17 [Member] | ProShares VIX Mid-Term Futures ETF [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.013% [1]
Debt instrument, maturity date Nov. 02, 2017 [1]
U.S. Treasury Bills 1.013% due 11/02/17 [Member] | 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 1.013% [1],[2]
Debt instrument, maturity date Nov. 02, 2017 [1],[2]
U.S. Treasury Bills 1.013% due 11/02/17 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.013% [1],[3]
Debt instrument, maturity date Nov. 02, 2017 [1],[3]
U.S. Treasury Bills 1.013% due 11/02/17 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.013% [1]
Debt instrument, maturity date Nov. 02, 2017 [1]
U.S. Treasury Bills 1.023% due 11/09/17 [Member] | ProShares VIX Short-Term Futures ETF [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.023% [1],[2]
Debt instrument, maturity date Nov. 09, 2017 [1],[2]
U.S. Treasury Bills 1.023% due 11/09/17 [Member] | ProShares VIX Mid-Term Futures ETF [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.023% [1]
Debt instrument, maturity date Nov. 09, 2017 [1]
U.S. Treasury Bills 1.023% due 11/09/17 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.023% [1]
Debt instrument, maturity date Nov. 09, 2017 [1]
U.S. Treasury Bills 0.988% due 11/16/17 [Member] | ProShares VIX Short-Term Futures ETF [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 0.988% [1],[2]
Debt instrument, maturity date Nov. 16, 2017 [1],[2]
U.S. Treasury Bills 0.962% due 11/30/17 [Member] | ProShares VIX Short-Term Futures ETF [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 0.962% [1],[2]
Debt instrument, maturity date Nov. 30, 2017 [1],[2]
U.S. Treasury Bills 0.962% due 11/30/17 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 0.962% [1],[3]
Debt instrument, maturity date Nov. 30, 2017 [1],[3]
U.S. Treasury Bills 0.962% due 11/30/17 [Member] | ProShares UltraShort Silver [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 0.962% [1],[4]
Debt instrument, maturity date Nov. 30, 2017 [1],[4]
U.S. Treasury Bills 0.962% due 11/30/17 [Member] | ProShares Ultra Silver [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 0.962% [1],[4]
Debt instrument, maturity date Nov. 30, 2017 [1],[4]
U.S. Treasury Bills 0.962% due 11/30/17 [Member] | ProShares Ultra Yen [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 0.962% [1]
Debt instrument, maturity date Nov. 30, 2017 [1]
U.S. Treasury Bills 1.033% due 12/07/17 [Member] | ProShares VIX Short-Term Futures ETF [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.033% [1],[2]
Debt instrument, maturity date Dec. 07, 2017 [1],[2]
U.S. Treasury Bills 0.987% due 12/14/17 [Member] | ProShares VIX Short-Term Futures ETF [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 0.987% [1],[2]
Debt instrument, maturity date Dec. 14, 2017 [1],[2]
U.S. Treasury Bills 0.987% due 12/14/17 [Member] | 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 0.987% [1],[2]
Debt instrument, maturity date Dec. 14, 2017 [1],[2]
U.S. Treasury Bills 0.987% due 12/14/17 [Member] | ProShares UltraShort Gold [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 0.987% [1],[4]
Debt instrument, maturity date Dec. 14, 2017 [1],[4]
U.S. Treasury Bills 0.987% due 12/14/17 [Member] | ProShares UltraShort Euro [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 0.987% [1],[5]
Debt instrument, maturity date Dec. 14, 2017 [1],[5]
U.S. Treasury Bills 0.987% due 12/14/17 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 0.987% [1],[3]
Debt instrument, maturity date Dec. 14, 2017 [1],[3]
U.S. Treasury Bills 0.987% due 12/14/17 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 0.987% [1]
Debt instrument, maturity date Dec. 14, 2017 [1]
U.S. Treasury Bills 0.987% due 12/14/17 [Member] | ProShares Ultra Gold [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 0.987% [1],[4]
Debt instrument, maturity date Dec. 14, 2017 [1],[4]
U.S. Treasury Bills 1.001% due 01/11/18 [Member] | ProShares VIX Short-Term Futures ETF [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.001% [1]
Debt instrument, maturity date Jan. 11, 2018 [1]
U.S. Treasury Bills 1.001% due 01/11/18 [Member] | 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 1.001% [1]
Debt instrument, maturity date Jan. 11, 2018 [1]
U.S. Treasury Bills 1.001% due 01/11/18 [Member] | 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 1.001% [1],[2]
Debt instrument, maturity date Jan. 11, 2018 [1],[2]
U.S. Treasury Bills 1.001% due 01/11/18 [Member] | ProShares UltraShort Gold [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.001% [1]
Debt instrument, maturity date Jan. 11, 2018 [1]
U.S. Treasury Bills 1.001% due 01/11/18 [Member] | ProShares UltraShort Euro [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.001% [1]
Debt instrument, maturity date Jan. 11, 2018 [1]
U.S. Treasury Bills 1.001% due 01/11/18 [Member] | ProShares UltraShort Yen [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.001% [1]
Debt instrument, maturity date Jan. 11, 2018 [1]
U.S. Treasury Bills 1.001% due 01/11/18 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.001% [1]
Debt instrument, maturity date Jan. 11, 2018 [1]
U.S. Treasury Bills 1.001% due 01/11/18 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.001% [1]
Debt instrument, maturity date Jan. 11, 2018 [1]
U.S. Treasury Bills 1.001% due 01/11/18 [Member] | ProShares Ultra Gold [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.001% [1]
Debt instrument, maturity date Jan. 11, 2018 [1]
U.S. Treasury Bills 1.001% due 01/11/18 [Member] | ProShares Ultra Silver [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.001% [1]
Debt instrument, maturity date Jan. 11, 2018 [1]
U.S. Treasury Bills 1.040% due 02/01/18 [Member] | ProShares VIX Short-Term Futures ETF [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.04% [1]
Debt instrument, maturity date Feb. 01, 2018 [1]
U.S. Treasury Bills 1.040% due 02/01/18 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.04% [1]
Debt instrument, maturity date Feb. 01, 2018 [1]
U.S. Treasury Bills 1.040% due 02/01/18 [Member] | ProShares UltraShort Gold [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.04% [1]
Debt instrument, maturity date Feb. 01, 2018 [1]
U.S. Treasury Bills 1.040% due 02/01/18 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.04% [1]
Debt instrument, maturity date Feb. 01, 2018 [1]
U.S. Treasury Bills 1.040% due 02/01/18 [Member] | ProShares Ultra Silver [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.04% [1]
Debt instrument, maturity date Feb. 01, 2018 [1]
U.S. Treasury Bills 1.040% due 02/01/18 [Member] | ProShares Ultra Yen [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.04% [1]
Debt instrument, maturity date Feb. 01, 2018 [1]
U.S. Treasury Bills 0.992% due 10/26/17 [Member] | ProShares VIX Mid-Term Futures ETF [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 0.992% [1]
Debt instrument, maturity date Oct. 26, 2017 [1]
U.S. Treasury Bills 0.992% due 10/26/17 [Member] | ProShares UltraShort Yen [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 0.992% [1]
Debt instrument, maturity date Oct. 26, 2017 [1]
U.S. Treasury Bills 0.992% due 10/26/17 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 0.992% [1]
Debt instrument, maturity date Oct. 26, 2017 [1]
U.S. Treasury Bills 0.977% due 11/16/17 [Member] | ProShares VIX Mid-Term Futures ETF [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 0.977% [1]
Debt instrument, maturity date Nov. 16, 2017 [1]
U.S. Treasury Bills 1.001% due 01/11/18 [Member] | ProShares VIX Mid-Term Futures ETF [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.001% [1]
Debt instrument, maturity date Jan. 11, 2018 [1]
U.S. Treasury Bills1.041% due 10/19/17 [Member] | 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 1.041% [1]
Debt instrument, maturity date Oct. 19, 2017 [1]
U.S. Treasury Bills 1.048% due 10/26/17 [Member] | 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 1.048% [1]
Debt instrument, maturity date Oct. 26, 2017 [1]
U.S. Treasury Bills 1.001% due 11/02/17 [Member] | 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 1.001% [1]
Debt instrument, maturity date Nov. 02, 2017 [1]
U.S. Treasury Bills 1.029% due 11/09/17 [Member] | 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 1.029% [1]
Debt instrument, maturity date Nov. 09, 2017 [1]
U.S. Treasury Bills 0.986% due 11/16/17 [Member] | 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 0.986% [1],[2]
Debt instrument, maturity date Nov. 16, 2017 [1],[2]
U.S. Treasury Bills 0.986% due 11/16/17 [Member] | 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 0.986% [1],[2]
Debt instrument, maturity date Nov. 16, 2017 [1],[2]
U.S. Treasury Bills 0.986% due 11/16/17 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 0.986% [1],[3]
Debt instrument, maturity date Nov. 16, 2017 [1],[3]
U.S. Treasury Bills 0.999% due 11/24/17 [Member] | 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 0.999% [1]
Debt instrument, maturity date Nov. 24, 2017 [1]
U.S. Treasury Bills 1.005% due 11/30/17 [Member] | 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 1.005% [1],[2]
Debt instrument, maturity date Nov. 30, 2017 [1],[2]
U.S. Treasury Bills 1.023% due 12/07/17 [Member] | 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 1.023% [1],[2]
Debt instrument, maturity date Dec. 07, 2017 [1],[2]
U.S. Treasury Bills 1.023% due 12/07/17 [Member] | ProShares Ultra Gold [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.023% [1],[4]
Debt instrument, maturity date Dec. 07, 2017 [1],[4]
U.S. Treasury Bills 1.013% due 10/19/17 [Member] | ProShares UltraShort Bloomberg Natural Gas [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.013% [1]
Debt instrument, maturity date Oct. 19, 2017 [1]
U.S. Treasury Bills 1.013% due 10/19/17 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.013% [1]
Debt instrument, maturity date Oct. 19, 2017 [1]
U.S. Treasury Bills 1.062% due 10/05/17 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.062% [1]
Debt instrument, maturity date Oct. 05, 2017 [1]
U.S. Treasury Bills 1.062% due 10/05/17 [Member] | ProShares UltraShort Gold [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.062% [1],[4]
Debt instrument, maturity date Oct. 05, 2017 [1],[4]
U.S. Treasury Bills 0.991% due 11/30/17 [Member] | ProShares UltraShort Gold [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 0.991% [1],[4]
Debt instrument, maturity date Nov. 30, 2017 [1],[4]
U.S. Treasury Bills 0.972% due 12/07/17 [Member] | ProShares UltraShort Gold [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 0.972% [1],[4]
Debt instrument, maturity date Dec. 07, 2017 [1],[4]
U.S. Treasury Bills 1.002% due 01/04/18 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.002% [1]
Debt instrument, maturity date Jan. 04, 2018 [1]
U.S. Treasury Bills 1.002% due 01/04/18 [Member] | ProShares UltraShort Gold [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.002% [1]
Debt instrument, maturity date Jan. 04, 2018 [1]
U.S. Treasury Bills 1.002% due 01/04/18 [Member] | ProShares UltraShort Euro [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.002% [1]
Debt instrument, maturity date Jan. 04, 2018 [1]
U.S. Treasury Bills 1.002% due 01/04/18 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.002% [1]
Debt instrument, maturity date Jan. 04, 2018 [1]
U.S. Treasury Bills 1.002% due 01/04/18 [Member] | ProShares Ultra Silver [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.002% [1]
Debt instrument, maturity date Jan. 04, 2018 [1]
U.S. Treasury Bills 1.088% due 10/26/17 [Member] | ProShares UltraShort Silver [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.088% [1],[4]
Debt instrument, maturity date Oct. 26, 2017 [1],[4]
U.S. Treasury Bills 1.012% due 12/07/17 [Member] | ProShares UltraShort Silver [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.012% [1],[4]
Debt instrument, maturity date Dec. 07, 2017 [1],[4]
U.S. Treasury Bills 1.040% due 02/01/18 [Member] | ProShares UltraShort Silver [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.04% [1]
Debt instrument, maturity date Feb. 01, 2018 [1]
U.S. Treasury Bills 1.089% due 10/12/17 [Member] | ProShares Short Euro [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.089% [1]
Debt instrument, maturity date Oct. 12, 2017 [1]
U.S. Treasury Bills 1.089% due 10/12/17 [Member] | ProShares UltraShort Australian Dollar [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.089% [1]
Debt instrument, maturity date Oct. 12, 2017 [1]
U.S. Treasury Bills 1.089% due 10/12/17 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.089% [1]
Debt instrument, maturity date Oct. 12, 2017 [1]
U.S. Treasury Bills 1.089% due 10/12/17 [Member] | ProShares Ultra Yen [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.089% [1],[5]
Debt instrument, maturity date Oct. 12, 2017 [1],[5]
U.S. Treasury Bills 1.057% due 10/12/17 [Member] | ProShares UltraShort Euro [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.057% [1],[5]
Debt instrument, maturity date Oct. 12, 2017 [1],[5]
U.S. Treasury Bills 1.013% due 10/19/17 [Member] | ProShares UltraShort Euro [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.013% [1],[5]
Debt instrument, maturity date Oct. 19, 2017 [1],[5]
U.S. Treasury Bills 1.013% due 10/19/17 [Member] | ProShares Ultra Gold [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.013% [1],[4]
Debt instrument, maturity date Oct. 19, 2017 [1],[4]
U.S. Treasury Bills 1.013% due 10/19/17 [Member] | ProShares Ultra Silver [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.013% [1],[4]
Debt instrument, maturity date Oct. 19, 2017 [1],[4]
U.S. Treasury Bills 1.015% due 10/26/17 [Member] | ProShares UltraShort Euro [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.015% [1],[5]
Debt instrument, maturity date Oct. 26, 2017 [1],[5]
U.S. Treasury Bills 0.998% due 11/02/17 [Member] | ProShares UltraShort Euro [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 0.998% [1]
Debt instrument, maturity date Nov. 02, 2017 [1]
U.S. Treasury Bills 1.079% due 11/09/17 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.079% [1],[3]
Debt instrument, maturity date Nov. 09, 2017 [1],[3]
U.S. Treasury Bills 1.079% due 11/09/17 [Member] | ProShares UltraShort Euro [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.079% [1],[5]
Debt instrument, maturity date Nov. 09, 2017 [1],[5]
U.S. Treasury Bills 1.079% due 11/09/17 [Member] | ProShares UltraShort Yen [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.079% [1],[5]
Debt instrument, maturity date Nov. 09, 2017 [1],[5]
U.S. Treasury Bills 1.079% due 11/09/17 [Member] | ProShares Ultra Gold [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.079% [1],[4]
Debt instrument, maturity date Nov. 09, 2017 [1],[4]
U.S. Treasury Bills 1.079% due 11/09/17 [Member] | ProShares Ultra Silver [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.079% [1],[4]
Debt instrument, maturity date Nov. 09, 2017 [1],[4]
U.S. Treasury Bills 0.982% due 11/16/17 [Member] | ProShares UltraShort Euro [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 0.982% [1],[5]
Debt instrument, maturity date Nov. 16, 2017 [1],[5]
U.S. Treasury Bills 0.962% due 11/30/17 [Member] | ProShares UltraShort Euro [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 0.962% [1],[5]
Debt instrument, maturity date Nov. 30, 2017 [1],[5]
U.S. Treasury Bills 0.962% due 11/30/17 [Member] | ProShares UltraShort Yen [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 0.962% [1],[5]
Debt instrument, maturity date Nov. 30, 2017 [1],[5]
U.S. Treasury Bills 1.040% due 02/01/18 [Member] | ProShares UltraShort Euro [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.04% [1]
Debt instrument, maturity date Feb. 01, 2018 [1]
U.S. Treasury Bills 1.040% due 02/01/18 [Member] | ProShares UltraShort Yen [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.04% [1]
Debt instrument, maturity date Feb. 01, 2018 [1]
U.S. Treasury Bills 1.011% due 10/05/17 [Member] | 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 1.011% [1],[2]
Debt instrument, maturity date Oct. 05, 2017 [1],[2]
U.S. Treasury Bills 1.067% due 10/12/17 [Member] | 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 1.067% [1],[2]
Debt instrument, maturity date Oct. 12, 2017 [1],[2]
U.S. Treasury Bills 1.081% due 10/19/17 [Member] | 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 1.081% [1],[2]
Debt instrument, maturity date Oct. 19, 2017 [1],[2]
U.S. Treasury Bills 1.000% due 10/26/17 [Member] | 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 1.00% [1],[2]
Debt instrument, maturity date Oct. 26, 2017 [1],[2]
U.S. Treasury Bills 0.957% due 11/09/17 [Member] | 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 0.957% [1],[2]
Debt instrument, maturity date Nov. 09, 2017 [1],[2]
U.S. Treasury Bills 0.999% due 11/30/17 [Member] | 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 0.999% [1],[2]
Debt instrument, maturity date Nov. 30, 2017 [1],[2]
U.S. Treasury Bills 1.002% due 12/07/17 [Member] | 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 1.002% [1],[2]
Debt instrument, maturity date Dec. 07, 2017 [1],[2]
U.S. Treasury Bills 1.000% due 12/14/17 [Member] | 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 1.00% [1],[2]
Debt instrument, maturity date Dec. 14, 2017 [1],[2]
U.S. Treasury Bills 1.065% due 10/12/17 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.065% [1]
Debt instrument, maturity date Oct. 12, 2017 [1]
U.S. Treasury Bills 1.070% due 10/19/17 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.07% [1],[3]
Debt instrument, maturity date Oct. 19, 2017 [1],[3]
U.S. Treasury Bills 1.070% due 10/19/17 [Member] | ProShares Ultra Euro [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.07% [1],[5]
Debt instrument, maturity date Oct. 19, 2017 [1],[5]
U.S. Treasury Bills 1.042% due 10/26/17 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.042% [1],[3]
Debt instrument, maturity date Oct. 26, 2017 [1],[3]
U.S. Treasury Bills 0.991% due 12/07/17 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 0.991% [1],[3]
Debt instrument, maturity date Dec. 07, 2017 [1],[3]
U.S. Treasury Bills 0.989% due 12/14/17 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 0.989% [1],[3]
Debt instrument, maturity date Dec. 14, 2017 [1],[3]
U.S. Treasury Bills 1.053% due 10/05/17 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.053% [1]
Debt instrument, maturity date Oct. 05, 2017 [1]
U.S. Treasury Bills 1.077% due 10/19/17 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.077% [1],[3]
Debt instrument, maturity date Oct. 19, 2017 [1],[3]
U.S. Treasury Bills 1.055% due 10/26/17 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.055% [1],[3]
Debt instrument, maturity date Oct. 26, 2017 [1],[3]
U.S. Treasury Bills 1.062% due 11/02/17 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.062% [1],[3]
Debt instrument, maturity date Nov. 02, 2017 [1],[3]
U.S. Treasury Bills 1.077% due 11/09/17 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.077% [1],[3]
Debt instrument, maturity date Nov. 09, 2017 [1],[3]
U.S. Treasury Bills 0.977% due 11/16/17 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 0.977% [1],[3]
Debt instrument, maturity date Nov. 16, 2017 [1],[3]
U.S. Treasury Bills 0.977% due 11/16/17 [Member] | ProShares Ultra Silver [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 0.977% [1],[4]
Debt instrument, maturity date Nov. 16, 2017 [1],[4]
U.S. Treasury Bills 0.982% due 11/30/17 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 0.982% [1],[3]
Debt instrument, maturity date Nov. 30, 2017 [1],[3]
U.S. Treasury Bills 0.970% due 12/07/17 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 0.97% [1],[3]
Debt instrument, maturity date Dec. 07, 2017 [1],[3]
U.S. Treasury Bills 1.040% due 02/01/18 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.04% [1]
Debt instrument, maturity date Feb. 01, 2018 [1]
U.S. Treasury Bills 1.108% due 10/12/17 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.108% [1]
Debt instrument, maturity date Oct. 12, 2017 [1]
U.S. Treasury Bills 1.018% due 10/05/17 [Member] | ProShares Ultra Gold [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.018% [1]
Debt instrument, maturity date Oct. 05, 2017 [1]
U.S. Treasury Bills 1.046% due 10/12/17 [Member] | ProShares Ultra Gold [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.046% [1],[4]
Debt instrument, maturity date Oct. 12, 2017 [1],[4]
U.S. Treasury Bills 1.015% due 10/05/17 [Member] | ProShares Ultra Silver [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.015% [1]
Debt instrument, maturity date Oct. 05, 2015 [1]
U.S. Treasury Bills 1.056% due 10/12/17 [Member] | ProShares Ultra Silver [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.056% [1],[4]
Debt instrument, maturity date Oct. 12, 2017 [1],[4]
U.S. Treasury Bills 1.036% due 10/26/17 [Member] | ProShares Ultra Silver [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.036% [1],[4]
Debt instrument, maturity date Oct. 26, 2017 [1],[4]
U.S. Treasury Bills 1.076% due 11/02/17 [Member] | ProShares Ultra Silver [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.076% [1],[4]
Debt instrument, maturity date Nov. 02, 2017 [1],[4]
U.S. Treasury Bills 1.004% due 12/07/17 [Member] | ProShares Ultra Silver [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.004% [1],[4]
Debt instrument, maturity date Dec. 07, 2017 [1],[4]
U.S. Treasury Bills 0.987% due 12/14/17 [Member] | ProShares Ultra Silver [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 0.987% [1],[4]
Debt instrument, maturity date Dec. 14, 2017 [1],[4]
U.S. Treasury Bills 1.025% due 10/12/17 [Member] | ProShares Ultra Euro [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.025% [1],[5]
Debt instrument, maturity date Oct. 12, 2017 [1],[5]
U.S. Treasury Bills 1.075% due 10/12/17 [Member] | ProShares UltraShort Yen [Member]  
Schedule of Investments [Line Items]  
Short-term U.S. government and agency obligations percentage of shareholders' equity 1.075% [1],[5]
Debt instrument, maturity date Oct. 12, 2017 [1],[5]
[1] Rates shown represents discount rate at the time of purchase.
[2] All or partial amount pledged as collateral for futures contracts.
[3] All or partial amount pledged as collateral for swap agreements and/or futures contracts.
[4] All or partial amount pledged as collateral for forward agreements and/or futures contracts.
[5] All or partial amount pledged as collateral for foreign currency forward contracts.