v3.10.0.1
Schedule of Investments - Short-Term U.S. Government and Agency Obligations (Detail) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Schedule of Investments [Line Items]    
Total short-term U.S. government and agency obligations, value $ 1,300,390,736 $ 2,445,779,873
ProShares Short Euro [Member]    
Schedule of Investments [Line Items]    
Total short-term U.S. government and agency obligations, value 5,687,064 6,996,235
ProShares Short Euro [Member] | U.S Treasury Bills 1.771% due 07/19/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 400,000  
Total short-term U.S. government and agency obligations, value [1] 399,669  
ProShares Short Euro [Member] | U.S. Treasury Bills 1.831% due 08/02/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 300,000  
Total short-term U.S. government and agency obligations, value [1] 299,541  
ProShares Short Euro [Member] | U.S. Treasury Bills 1.871% due 08/09/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 4,000,000  
Total short-term U.S. government and agency obligations, value [1] 3,992,337  
ProShares Short Euro [Member] | U.S. Treasury Bills 1.907% due 08/30/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 400,000  
Total short-term U.S. government and agency obligations, value [1] 398,781  
ProShares Short Euro [Member] | U.S. Treasury Bills 1.886% due 09/13/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 200,000  
Total short-term U.S. government and agency obligations, value [1] 199,238  
ProShares Short Euro [Member] | U.S. Treasury Bills 1.934% due 10/11/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 200,000  
Total short-term U.S. government and agency obligations, value [1] 198,917  
ProShares Short Euro [Member] | U.S. Treasury Bills 1.990% due 11/08/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 200,000  
Total short-term U.S. government and agency obligations, value [1] 198,581  
ProShares Short VIX Short-Term Futures ETF [Member]    
Schedule of Investments [Line Items]    
Total short-term U.S. government and agency obligations, value 92,995,995 494,910,644
ProShares Short VIX Short-Term Futures ETF [Member] | Federal Home Loan Discount Notes 1.551% due 07/02/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 93,000,000  
Total short-term U.S. government and agency obligations, value [1] 92,995,995  
ProShares Ultra Bloomberg Crude Oil [Member]    
Schedule of Investments [Line Items]    
Total short-term U.S. government and agency obligations, value 365,955,628 459,515,902
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.831% due 08/02/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 23,000,000  
Total short-term U.S. government and agency obligations, value [1] 22,964,845  
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.871% due 08/09/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[2] 110,000,000  
Total short-term U.S. government and agency obligations, value [1],[2] 109,789,262  
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.934% due 10/11/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[2] 16,000,000  
Total short-term U.S. government and agency obligations, value [1],[2] 15,913,365  
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.990% due 11/08/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[2] 15,000,000  
Total short-term U.S. government and agency obligations, value [1],[2] 14,893,575  
ProShares Ultra Bloomberg Crude Oil [Member] | Federal Home Loan Discount Notes 1.551% due 07/02/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 14,000,000  
Total short-term U.S. government and agency obligations, value [1] 13,999,397  
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.741% due 07/05/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 37,000,000  
Total short-term U.S. government and agency obligations, value [1] 36,994,790  
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.787% due 07/19/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 40,000,000  
Total short-term U.S. government and agency obligations, value [1] 39,966,944  
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.884% due 08/16/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 3,000,000  
Total short-term U.S. government and agency obligations, value [1] 2,993,175  
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.907% due 08/30/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[2] 27,000,000  
Total short-term U.S. government and agency obligations, value [1],[2] 26,917,696  
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.888% due 09/13/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[2] 30,000,000  
Total short-term U.S. government and agency obligations, value [1],[2] 29,885,634  
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.895% due 09/27/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 13,000,000  
Total short-term U.S. government and agency obligations, value [1] 12,940,780  
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.946% due 10/25/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 12,000,000  
Total short-term U.S. government and agency obligations, value [1] 11,925,442  
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 2.036% due 11/23/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 12,000,000  
Total short-term U.S. government and agency obligations, value [1] 11,903,520  
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 2.049% due 12/06/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[2] 15,000,000  
Total short-term U.S. government and agency obligations, value [1],[2] 14,867,203  
ProShares Ultra Bloomberg Natural Gas [Member]    
Schedule of Investments [Line Items]    
Total short-term U.S. government and agency obligations, value 17,960,426 50,961,356
ProShares Ultra Bloomberg Natural Gas [Member] | U.S Treasury Bills 1.771% due 07/19/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 1,000,000  
Total short-term U.S. government and agency obligations, value [1] 999,174  
ProShares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 1.831% due 08/02/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 1,000,000  
Total short-term U.S. government and agency obligations, value [1] 998,471  
ProShares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 1.871% due 08/09/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 2,000,000  
Total short-term U.S. government and agency obligations, value [1] 1,996,168  
ProShares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 1.884% due 08/16/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 13,000,000  
Total short-term U.S. government and agency obligations, value [1] 12,970,425  
ProShares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 1.890% due 09/13/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 1,000,000  
Total short-term U.S. government and agency obligations, value [1] 996,188  
ProShares Ultra Euro [Member]    
Schedule of Investments [Line Items]    
Total short-term U.S. government and agency obligations, value 3,289,040 6,996,235
ProShares Ultra Euro [Member] | U.S. Treasury Bills 1.831% due 08/02/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 300,000  
Total short-term U.S. government and agency obligations, value [1] 299,541  
ProShares Ultra Euro [Member] | U.S. Treasury Bills 1.907% due 08/30/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 300,000  
Total short-term U.S. government and agency obligations, value [1] 299,085  
ProShares Ultra Euro [Member] | U.S. Treasury Bills 1.934% due 10/11/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 200,000  
Total short-term U.S. government and agency obligations, value [1] 198,917  
ProShares Ultra Euro [Member] | U.S. Treasury Bills 1.990% due 11/08/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 200,000  
Total short-term U.S. government and agency obligations, value [1] 198,581  
ProShares Ultra Euro [Member] | U.S. Treasury Bills 1.888% due 09/13/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 400,000  
Total short-term U.S. government and agency obligations, value [1] 398,475  
ProShares Ultra Euro [Member] | U.S. Treasury Bills 1.895% due 09/27/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 200,000  
Total short-term U.S. government and agency obligations, value [1] 199,089  
ProShares Ultra Euro [Member] | U.S. Treasury Bills 1.946% due 10/25/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 100,000  
Total short-term U.S. government and agency obligations, value [1] 99,379  
ProShares Ultra Euro [Member] | U.S. Treasury Bills 2.036% due 11/23/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 200,000  
Total short-term U.S. government and agency obligations, value [1] 198,392  
ProShares Ultra Euro [Member] | United States Treasury Bills One Point Seven Three Seven Percentage Due July Five Two Thousand And Eighteen [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 500,000  
Total short-term U.S. government and agency obligations, value [1] 499,930  
ProShares Ultra Euro [Member] | U.S. Treasury Bills 1.795% due 07/19/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 700,000  
Total short-term U.S. government and agency obligations, value [1] 699,422  
ProShares Ultra Euro [Member] | U.S. Treasury Bills 2.049% due 12/06/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 200,000  
Total short-term U.S. government and agency obligations, value [1] 198,229  
ProShares Ultra Gold [Member]    
Schedule of Investments [Line Items]    
Total short-term U.S. government and agency obligations, value 87,847,390 88,884,844
ProShares Ultra Gold [Member] | U.S. Treasury Bills 1.831% due 08/02/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[3] 5,000,000  
Total short-term U.S. government and agency obligations, value [1],[3] 4,992,357  
ProShares Ultra Gold [Member] | U.S. Treasury Bills 1.907% due 08/30/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[3] 6,000,000  
Total short-term U.S. government and agency obligations, value [1],[3] 5,981,710  
ProShares Ultra Gold [Member] | U.S. Treasury Bills 1.934% due 10/11/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[3] 3,000,000  
Total short-term U.S. government and agency obligations, value [1],[3] 2,983,756  
ProShares Ultra Gold [Member] | U.S. Treasury Bills 1.990% due 11/08/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[3] 3,000,000  
Total short-term U.S. government and agency obligations, value [1],[3] 2,978,715  
ProShares Ultra Gold [Member] | Federal Home Loan Discount Notes 1.551% due 07/02/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[4] 41,000,000  
Total short-term U.S. government and agency obligations, value [1] 40,998,234  
ProShares Ultra Gold [Member] | U.S. Treasury Bills 1.741% due 07/05/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 8,000,000  
Total short-term U.S. government and agency obligations, value [1] 7,998,874  
ProShares Ultra Gold [Member] | U.S. Treasury Bills 1.884% due 08/16/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[3] 1,000,000  
Total short-term U.S. government and agency obligations, value [1],[3] 997,725  
ProShares Ultra Gold [Member] | U.S. Treasury Bills 1.888% due 09/13/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[3] 6,000,000  
Total short-term U.S. government and agency obligations, value [1],[3] 5,977,127  
ProShares Ultra Gold [Member] | U.S. Treasury Bills 1.895% due 09/27/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[3] 2,000,000  
Total short-term U.S. government and agency obligations, value [1],[3] 1,990,889  
ProShares Ultra Gold [Member] | U.S. Treasury Bills 1.946% due 10/25/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[3] 2,000,000  
Total short-term U.S. government and agency obligations, value [1],[3] 1,987,574  
ProShares Ultra Gold [Member] | U.S. Treasury Bills 2.036% due 11/23/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[3] 2,000,000  
Total short-term U.S. government and agency obligations, value [1],[3] 1,983,920  
ProShares Ultra Gold [Member] | U.S. Treasury Bills 2.049% due 12/06/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[3] 2,000,000  
Total short-term U.S. government and agency obligations, value [1],[3] 1,982,294  
ProShares Ultra Gold [Member] | U.S. Treasury Bills 1.783% due 07/19/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 7,000,000  
Total short-term U.S. government and agency obligations, value [1] 6,994,215  
ProShares Ultra Silver [Member]    
Schedule of Investments [Line Items]    
Total short-term U.S. government and agency obligations, value 212,508,884 235,581,716
ProShares Ultra Silver [Member] | U.S. Treasury Bills 1.831% due 08/02/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 12,000,000  
Total short-term U.S. government and agency obligations, value [1] 11,981,658  
ProShares Ultra Silver [Member] | U.S. Treasury Bills 1.871% due 08/09/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[3] 20,000,000  
Total short-term U.S. government and agency obligations, value [1],[3] 19,961,684  
ProShares Ultra Silver [Member] | U.S. Treasury Bills 1.907% due 08/30/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[3] 14,000,000  
Total short-term U.S. government and agency obligations, value [1],[3] 13,957,324  
ProShares Ultra Silver [Member] | U.S. Treasury Bills 1.934% due 10/11/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[3] 8,000,000  
Total short-term U.S. government and agency obligations, value [1],[3] 7,956,683  
ProShares Ultra Silver [Member] | U.S. Treasury Bills 1.990% due 11/08/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[3] 8,000,000  
Total short-term U.S. government and agency obligations, value [1],[3] 7,943,240  
ProShares Ultra Silver [Member] | Federal Home Loan Discount Notes 1.551% due 07/02/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 56,000,000  
Total short-term U.S. government and agency obligations, value [1] 55,997,588  
ProShares Ultra Silver [Member] | U.S. Treasury Bills 1.741% due 07/05/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 20,000,000  
Total short-term U.S. government and agency obligations, value [1] 19,997,184  
ProShares Ultra Silver [Member] | U.S. Treasury Bills 1.884% due 08/16/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[3] 13,000,000  
Total short-term U.S. government and agency obligations, value [1],[3] 12,970,425  
ProShares Ultra Silver [Member] | U.S. Treasury Bills 1.888% due 09/13/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[3] 16,000,000  
Total short-term U.S. government and agency obligations, value [1],[3] 15,939,005  
ProShares Ultra Silver [Member] | U.S. Treasury Bills 1.895% due 09/27/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[3] 7,000,000  
Total short-term U.S. government and agency obligations, value [1],[3] 6,968,112  
ProShares Ultra Silver [Member] | U.S. Treasury Bills 1.946% due 10/25/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[3] 6,000,000  
Total short-term U.S. government and agency obligations, value [1],[3] 5,962,721  
ProShares Ultra Silver [Member] | U.S. Treasury Bills 2.036% due 11/23/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 6,000,000  
Total short-term U.S. government and agency obligations, value [1] 5,951,760  
ProShares Ultra Silver [Member] | U.S. Treasury Bills 2.049% due 12/06/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[3] 7,000,000  
Total short-term U.S. government and agency obligations, value [1],[3] 6,938,028  
ProShares Ultra Silver [Member] | U.S. Treasury Bills 1.785% due 07/19/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 20,000,000  
Total short-term U.S. government and agency obligations, value [1] 19,983,472  
ProShares Ultra Yen [Member]    
Schedule of Investments [Line Items]    
Total short-term U.S. government and agency obligations, value 998,084 1,997,933
ProShares Ultra Yen [Member] | U.S. Treasury Bills 1.871% due 08/09/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 1,000,000  
Total short-term U.S. government and agency obligations, value [1] 998,084  
ProShares UltraShort Australian Dollar [Member]    
Schedule of Investments [Line Items]    
Total short-term U.S. government and agency obligations, value 4,988,329 11,983,904
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 1.934% due 10/11/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 200,000  
Total short-term U.S. government and agency obligations, value [1] 198,917  
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 1.990% due 11/08/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 100,000  
Total short-term U.S. government and agency obligations, value [1] 99,291  
ProShares UltraShort Australian Dollar [Member] | Federal Home Loan Discount Notes 1.551% due 07/02/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 1,000,000  
Total short-term U.S. government and agency obligations, value [1] 999,957  
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 1.888% due 09/13/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 400,000  
Total short-term U.S. government and agency obligations, value [1] 398,475  
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 1.895% due 09/27/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 100,000  
Total short-term U.S. government and agency obligations, value [1] 99,544  
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 1.946% due 10/25/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 100,000  
Total short-term U.S. government and agency obligations, value [1] 99,379  
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 2.036% due 11/23/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 200,000  
Total short-term U.S. government and agency obligations, value [1] 198,392  
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 2.049% due 12/06/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 200,000  
Total short-term U.S. government and agency obligations, value [1] 198,229  
ProShares UltraShort Australian Dollar [Member] | US Treasury Bills 1.737% due 07/05/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 500,000  
Total short-term U.S. government and agency obligations, value [1] 499,930  
ProShares UltraShort Australian Dollar [Member] | United States Treasury Bills 1.792% due 07/19/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 600,000  
Total short-term U.S. government and agency obligations, value [1] 599,504  
ProShares UltraShort Australian Dollar [Member] | US Treasury Bills 1.831% due 08/02/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 300,000  
Total short-term U.S. government and agency obligations, value [1] 299,541  
ProShares UltraShort Australian Dollar [Member] | US Treasury Bills 1.871% due 08/09/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 1,000,000  
Total short-term U.S. government and agency obligations, value [1] 998,084  
ProShares UltraShort Australian Dollar [Member] | US Treasury Bills 1.907% due 08/30/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 300,000  
Total short-term U.S. government and agency obligations, value [1] 299,086  
ProShares UltraShort Bloomberg Crude Oil [Member]    
Schedule of Investments [Line Items]    
Total short-term U.S. government and agency obligations, value 173,652,213 253,646,823
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.831% due 08/02/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 10,000,000  
Total short-term U.S. government and agency obligations, value [1],[2] 9,984,715  
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.871% due 08/09/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[2] 5,000,000  
Total short-term U.S. government and agency obligations, value [1],[2] 4,990,421  
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.907% due 08/30/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[2] 12,000,000  
Total short-term U.S. government and agency obligations, value [1],[2] 11,963,420  
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.934% due 10/11/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[2] 7,000,000  
Total short-term U.S. government and agency obligations, value [1],[2] 6,962,097  
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.990% due 11/08/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[2] 6,000,000  
Total short-term U.S. government and agency obligations, value [1],[2] 5,957,430  
ProShares UltraShort Bloomberg Crude Oil [Member] | Federal Home Loan Discount Notes 1.551% due 07/02/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 70,000,000  
Total short-term U.S. government and agency obligations, value [1] 69,996,985  
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.741% due 07/05/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 15,000,000  
Total short-term U.S. government and agency obligations, value [1],[2] 14,997,888  
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.888% due 09/13/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[2] 12,000,000  
Total short-term U.S. government and agency obligations, value [1],[2] 11,954,254  
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.895% due 09/27/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[2] 5,000,000  
Total short-term U.S. government and agency obligations, value [1],[2] 4,977,223  
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.946% due 10/25/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[2] 4,000,000  
Total short-term U.S. government and agency obligations, value [1],[2] 3,975,147  
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 2.049% due 12/06/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[2] 6,000,000  
Total short-term U.S. government and agency obligations, value [1],[2] 5,946,882  
ProShares UltraShort Bloomberg Crude Oil [Member] | United States Treasury Bills 1.786% due 07/19/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 17,000,000  
Total short-term U.S. government and agency obligations, value [1],[2] 16,985,951  
ProShares UltraShort Bloomberg Crude Oil [Member] | United States Treasury Bills 2.036% due 11/23/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[2] 5,000,000  
Total short-term U.S. government and agency obligations, value [1],[2] 4,959,800  
ProShares UltraShort Bloomberg Natural Gas [Member]    
Schedule of Investments [Line Items]    
Total short-term U.S. government and agency obligations, value 4,093,202 3,999,751
ProShares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 1.934% due 10/11/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 100,000  
Total short-term U.S. government and agency obligations, value [1] 99,458  
ProShares UltraShort Bloomberg Natural Gas [Member] | Federal Home Loan Discount Notes 1.551% due 07/02/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 1,000,000  
Total short-term U.S. government and agency obligations, value [1] 999,957  
ProShares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 1.888% due 09/13/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 200,000  
Total short-term U.S. government and agency obligations, value [1] 199,238  
ProShares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 2.049% due 12/06/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 100,000  
Total short-term U.S. government and agency obligations, value [1] 99,115  
ProShares UltraShort Bloomberg Natural Gas [Member] | US Treasury Bills 1.737% due 07/05/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 200,000  
Total short-term U.S. government and agency obligations, value [1] 199,972  
ProShares UltraShort Bloomberg Natural Gas [Member] | US Treasury Bills 1.831% due 08/02/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 100,000  
Total short-term U.S. government and agency obligations, value [1] 99,847  
ProShares UltraShort Bloomberg Natural Gas [Member] | US Treasury Bills 1.871% due 08/09/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 2,000,000  
Total short-term U.S. government and agency obligations, value [1] 1,996,168  
ProShares UltraShort Bloomberg Natural Gas [Member] | US Treasury Bills 1.907% due 08/30/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 100,000  
Total short-term U.S. government and agency obligations, value [1] 99,695  
ProShares UltraShort Bloomberg Natural Gas [Member] | US Treasury Bills 1.799% due 07/19/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 300,000  
Total short-term U.S. government and agency obligations, value [1] 299,752  
ProShares UltraShort Euro [Member]    
Schedule of Investments [Line Items]    
Total short-term U.S. government and agency obligations, value 141,652,985 204,770,166
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 1.831% due 08/02/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 11,000,000  
Total short-term U.S. government and agency obligations, value [1] 10,983,187  
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 1.871% due 08/09/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 30,000,000  
Total short-term U.S. government and agency obligations, value [1] 29,942,526  
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 1.907% due 08/30/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 8,000,000  
Total short-term U.S. government and agency obligations, value [1] 7,975,614  
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 1.934% due 10/11/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[5] 7,000,000  
Total short-term U.S. government and agency obligations, value [1],[5] 6,962,097  
ProShares UltraShort Euro [Member] | Federal Home Loan Discount Notes 1.551% due 07/02/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 14,000,000  
Total short-term U.S. government and agency obligations, value [1] 13,999,397  
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 1.741% due 07/05/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 16,000,000  
Total short-term U.S. government and agency obligations, value [1] 15,997,747  
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 1.884% due 08/16/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[5] 8,000,000  
Total short-term U.S. government and agency obligations, value [1],[5] 7,981,800  
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 1.888% due 09/13/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[5] 13,000,000  
Total short-term U.S. government and agency obligations, value [1],[5] 12,950,441  
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 1.895% due 09/27/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 5,000,000  
Total short-term U.S. government and agency obligations, value [1] 4,977,223  
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 2.036% due 11/23/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 5,000,000  
Total short-term U.S. government and agency obligations, value [1] 4,959,800  
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 2.049% due 12/06/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[5] 7,000,000  
Total short-term U.S. government and agency obligations, value [1],[5] 6,938,028  
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 1.785% due 07/19/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 18,000,000  
Total short-term U.S. government and agency obligations, value [1] 17,985,125  
ProShares UltraShort Gold [Member]    
Schedule of Investments [Line Items]    
Total short-term U.S. government and agency obligations, value 22,954,734 31,977,900
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 1.831% due 08/02/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 1,000,000  
Total short-term U.S. government and agency obligations, value [1] 998,471  
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 1.871% due 08/09/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[2] 10,000,000  
Total short-term U.S. government and agency obligations, value [1],[2] 9,980,842  
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 1.907% due 08/30/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[2] 1,000,000  
Total short-term U.S. government and agency obligations, value [1],[2] 996,952  
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 1.886% due 09/13/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[2] 1,000,000  
Total short-term U.S. government and agency obligations, value [1],[2] 996,188  
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 1.884% due 08/16/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 7,000,000  
Total short-term U.S. government and agency obligations, value [1] 6,984,075  
ProShares UltraShort Gold [Member] | US Treasury Bills 1.737% due 07/05/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 1,000,000  
Total short-term U.S. government and agency obligations, value [1] 999,859  
ProShares UltraShort Gold [Member] | United States Treasury Bills 1.792% due 07/19/18 [Member]    
Schedule of Investments [Line Items]    
Total short-term U.S. government and agency obligations, value [1] 1,998,347  
ProShares UltraShort Gold [Member] | US Treasury Bills One Point Seven Nine Five Percentage Due July Nineteen Two Thousand and Eighteen [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 2,000,000  
ProShares UltraShort Silver [Member]    
Schedule of Investments [Line Items]    
Total short-term U.S. government and agency obligations, value 19,972,425 18,349,861
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 1.831% due 08/02/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 1,000,000  
Total short-term U.S. government and agency obligations, value [1] 998,471  
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 1.871% due 08/09/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[2] 7,000,000  
Total short-term U.S. government and agency obligations, value [1],[2] 6,986,589  
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 1.907% due 08/30/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[2] 1,000,000  
Total short-term U.S. government and agency obligations, value [1],[2] 996,952  
ProShares UltraShort Silver [Member] | Federal Home Loan Discount Notes 1.551% due 07/02/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 6,000,000  
Total short-term U.S. government and agency obligations, value [1] 5,999,742  
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 1.884% due 08/16/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[2] 2,000,000  
Total short-term U.S. government and agency obligations, value [1],[2] 1,995,450  
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 1.890% due 09/13/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[2] 1,000,000  
Total short-term U.S. government and agency obligations, value [1],[2] 996,188  
ProShares UltraShort Silver [Member] | US Treasury Bills 1.743% due 07/05/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 1,000,000  
Total short-term U.S. government and agency obligations, value [1] 999,859  
ProShares UltraShort Silver [Member] | US Treasury Bills 1.771% due 07/19/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 1,000,000  
Total short-term U.S. government and agency obligations, value [1] 999,174  
ProShares UltraShort Yen [Member]    
Schedule of Investments [Line Items]    
Total short-term U.S. government and agency obligations, value 80,837,136 131,834,352
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 1.871% due 08/09/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 10,000,000  
Total short-term U.S. government and agency obligations, value [1] 9,980,842  
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 1.934% due 10/11/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[5] 3,000,000  
Total short-term U.S. government and agency obligations, value [1],[5] 2,983,756  
ProShares UltraShort Yen [Member] | Federal Home Loan Discount Notes 1.551% due 07/02/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 22,000,000  
Total short-term U.S. government and agency obligations, value [1] 21,999,053  
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 1.741% due 07/05/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 6,000,000  
Total short-term U.S. government and agency obligations, value [1] 5,999,155  
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 1.884% due 08/16/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[2] 20,000,000  
Total short-term U.S. government and agency obligations, value [1],[5] 19,954,500  
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 1.888% due 09/13/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[5] 5,000,000  
Total short-term U.S. government and agency obligations, value [1],[5] 4,980,939  
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 1.895% due 09/27/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[5] 2,000,000  
Total short-term U.S. government and agency obligations, value [1],[5] 1,990,889  
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 1.946% due 10/25/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[5] 2,000,000  
Total short-term U.S. government and agency obligations, value [1],[5] 1,987,573  
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 2.049% due 12/06/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[5] 2,000,000  
Total short-term U.S. government and agency obligations, value [1],[5] 1,982,294  
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 1.783% due 07/19/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 7,000,000  
Total short-term U.S. government and agency obligations, value [1] 6,994,215  
ProShares UltraShort Yen [Member] | United States Treasury Bills 2.036% due 11/23/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1],[5] 2,000,000  
Total short-term U.S. government and agency obligations, value [1] 1,983,920  
ProShares VIX Short-Term Futures ETF [Member]    
Schedule of Investments [Line Items]    
Total short-term U.S. government and agency obligations, value 21,999,053 134,845,604
ProShares VIX Short-Term Futures ETF [Member] | Federal Home Loan Discount Notes 1.551% due 07/02/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 22,000,000  
Total short-term U.S. government and agency obligations, value [1] 21,999,053  
ProShares Ultra VIX Short-Term Futures ETF [Member]    
Schedule of Investments [Line Items]    
Total short-term U.S. government and agency obligations, value 42,998,148 $ 287,533,132
ProShares Ultra VIX Short-Term Futures ETF [Member] | Federal Home Loan Discount Notes 1.551% due 07/02/18 [Member]    
Schedule of Investments [Line Items]    
Principal Amount [1] 43,000,000  
Total short-term U.S. government and agency obligations, value [1] $ 42,998,148  
[1] Rates shown represent discount rate at the time of purchase.
[2] All or partial amount pledged as collateral for swap agreements.
[3] All or partial amount pledged as collateral for forward agreements.
[4] For forward agreements, a positive amount represents "long" exposure to the underlying commodity. A negative amount represents "short" exposure to the underlying commodity.
[5] All or partial amount pledged as collateral for foreign currency forward contracts.