v3.8.0.1
Schedule of Investments - Short-Term U.S. Government and Agency Obligations (Detail)
Sep. 30, 2017
USD ($)
Schedule of Investments [Line Items]  
Total short-term U.S. government and agency obligations, value $ 3,181,660,408
ProShares VIX Short-Term Futures ETF [Member]  
Schedule of Investments [Line Items]  
Total short-term U.S. government and agency obligations, value 186,716,429
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.998% due 10/05/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 7,000,000 [1]
Total short-term U.S. government and agency obligations, value 6,999,568 [1]
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.043% due 10/12/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 18,000,000 [1]
Total short-term U.S. government and agency obligations, value 17,995,300 [1]
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.928% due 10/19/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 11,000,000 [1]
Total short-term U.S. government and agency obligations, value 10,995,222 [1]
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.037% due 10/26/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 35,000,000 [1],[2]
Total short-term U.S. government and agency obligations, value 34,978,185 [1],[2]
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.013% due 11/02/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 7,000,000 [1],[2]
Total short-term U.S. government and agency obligations, value 6,994,243 [1],[2]
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.023% due 11/09/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 4,000,000 [1],[2]
Total short-term U.S. government and agency obligations, value 3,995,947 [1],[2]
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.988% due 11/16/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 29,000,000 [1],[2]
Total short-term U.S. government and agency obligations, value 28,965,383 [1],[2]
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.962% due 11/30/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 13,000,000 [1],[2]
Total short-term U.S. government and agency obligations, value 12,979,014 [1],[2]
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.033% due 12/07/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 7,000,000 [1],[2]
Total short-term U.S. government and agency obligations, value 6,987,359 [1],[2]
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.987% due 12/14/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 11,000,000 [1],[2]
Total short-term U.S. government and agency obligations, value 10,978,586 [1],[2]
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.001% due 01/11/18 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 12,000,000 [1]
Total short-term U.S. government and agency obligations, value 11,966,165 [1]
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.040% due 02/01/18 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 33,000,000 [1]
Total short-term U.S. government and agency obligations, value 32,881,457 [1]
ProShares VIX Mid-Term Futures ETF [Member]  
Schedule of Investments [Line Items]  
Total short-term U.S. government and agency obligations, value 35,955,278
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 1.013% due 11/02/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 5,000,000 [1]
Total short-term U.S. government and agency obligations, value 4,995,888 [1]
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 1.023% due 11/09/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 2,000,000 [1]
Total short-term U.S. government and agency obligations, value 1,997,973 [1]
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.992% due 10/26/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 13,000,000 [1]
Total short-term U.S. government and agency obligations, value 12,991,897 [1]
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.977% due 11/16/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 9,000,000 [1]
Total short-term U.S. government and agency obligations, value 8,989,257 [1]
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 1.001% due 01/11/18 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 7,000,000 [1]
Total short-term U.S. government and agency obligations, value 6,980,263 [1]
ProShares Short VIX Short-Term Futures ETF [Member]  
Schedule of Investments [Line Items]  
Total short-term U.S. government and agency obligations, value 770,134,521
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.987% due 12/14/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 50,000,000 [1],[2]
Total short-term U.S. government and agency obligations, value 49,902,665 [1],[2]
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.001% due 01/11/18 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 9,000,000 [1]
Total short-term U.S. government and agency obligations, value 8,974,624 [1]
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills1.041% due 10/19/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 47,000,000 [1]
Total short-term U.S. government and agency obligations, value 46,979,583 [1]
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.048% due 10/26/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 78,000,000 [1]
Total short-term U.S. government and agency obligations, value 77,951,383 [1]
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.001% due 11/02/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 115,000,000 [1]
Total short-term U.S. government and agency obligations, value 114,905,424 [1]
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.029% due 11/09/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 199,000,000 [1]
Total short-term U.S. government and agency obligations, value 198,798,353 [1]
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.986% due 11/16/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 160,000,000 [1],[2]
Total short-term U.S. government and agency obligations, value 159,809,008 [1],[2]
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.999% due 11/24/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 10,000,000 [1]
Total short-term U.S. government and agency obligations, value 9,985,499 [1]
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.005% due 11/30/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 73,000,000 [1],[2]
Total short-term U.S. government and agency obligations, value 72,882,156 [1],[2]
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.023% due 12/07/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 30,000,000 [1],[2]
Total short-term U.S. government and agency obligations, value 29,945,826 [1],[2]
ProShares Ultra VIX Short-Term Futures ETF [Member]  
Schedule of Investments [Line Items]  
Total short-term U.S. government and agency obligations, value 521,315,100
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.013% due 11/02/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 13,000,000 [1],[2]
Total short-term U.S. government and agency obligations, value 12,989,309 [1],[2]
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.001% due 01/11/18 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 50,000,000 [1],[2]
Total short-term U.S. government and agency obligations, value 49,859,020 [1],[2]
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.986% due 11/16/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 97,000,000 [1],[2]
Total short-term U.S. government and agency obligations, value 96,884,211 [1],[2]
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.011% due 10/05/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 15,023,000 [1],[2]
Total short-term U.S. government and agency obligations, value 15,022,073 [1],[2]
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.067% due 10/12/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 20,000,000 [1],[2]
Total short-term U.S. government and agency obligations, value 19,994,778 [1],[2]
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.081% due 10/19/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 46,000,000 [1],[2]
Total short-term U.S. government and agency obligations, value 45,980,017 [1],[2]
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.000% due 10/26/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 47,000,000 [1],[2]
Total short-term U.S. government and agency obligations, value 46,970,705 [1],[2]
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.957% due 11/09/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 20,000,000 [1],[2]
Total short-term U.S. government and agency obligations, value 19,979,734 [1],[2]
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.999% due 11/30/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 128,000,000 [1],[2]
Total short-term U.S. government and agency obligations, value 127,793,370 [1],[2]
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.002% due 12/07/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 66,000,000 [1],[2]
Total short-term U.S. government and agency obligations, value 65,880,817 [1],[2]
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.000% due 12/14/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 20,000,000 [1],[2]
Total short-term U.S. government and agency obligations, value 19,961,066 [1],[2]
ProShares UltraShort Bloomberg Crude Oil [Member]  
Schedule of Investments [Line Items]  
Total short-term U.S. government and agency obligations, value 246,666,306
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.013% due 11/02/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 6,000,000 [1],[3]
Total short-term U.S. government and agency obligations, value 5,995,066 [1],[3]
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.962% due 11/30/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 22,000,000 [1],[3]
Total short-term U.S. government and agency obligations, value 21,964,485 [1],[3]
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.040% due 02/01/18 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 28,000,000 [1]
Total short-term U.S. government and agency obligations, value 27,899,418 [1]
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.986% due 11/16/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 11,000,000 [1],[3]
Total short-term U.S. government and agency obligations, value 10,986,869 [1],[3]
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.062% due 10/05/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 16,000,000 [1]
Total short-term U.S. government and agency obligations, value 15,999,013 [1]
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.002% due 01/04/18 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 14,000,000 [1]
Total short-term U.S. government and agency obligations, value 13,962,714 [1]
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.079% due 11/09/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 11,000,000 [1],[3]
Total short-term U.S. government and agency obligations, value 10,988,854 [1],[3]
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.065% due 10/12/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 19,000,000 [1]
Total short-term U.S. government and agency obligations, value 18,995,039 [1]
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.070% due 10/19/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 53,000,000 [1],[3]
Total short-term U.S. government and agency obligations, value 52,976,977 [1],[3]
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.042% due 10/26/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 20,000,000 [1],[3]
Total short-term U.S. government and agency obligations, value 19,987,534 [1],[3]
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.991% due 12/07/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 13,000,000 [1],[3]
Total short-term U.S. government and agency obligations, value 12,976,525 [1],[3]
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.989% due 12/14/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 34,000,000 [1],[3]
Total short-term U.S. government and agency obligations, value 33,933,812 [1],[3]
ProShares UltraShort Bloomberg Natural Gas [Member]  
Schedule of Investments [Line Items]  
Total short-term U.S. government and agency obligations, value 2,998,697
ProShares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 1.013% due 10/19/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 3,000,000 [1]
Total short-term U.S. government and agency obligations, value 2,998,697 [1]
ProShares UltraShort Gold [Member]  
Schedule of Investments [Line Items]  
Total short-term U.S. government and agency obligations, value 34,940,087
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.987% due 12/14/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 5,000,000 [1],[4]
Total short-term U.S. government and agency obligations, value 4,990,267 [1],[4]
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 1.001% due 01/11/18 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 5,000,000 [1]
Total short-term U.S. government and agency obligations, value 4,985,902 [1]
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 1.040% due 02/01/18 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 3,000,000 [1]
Total short-term U.S. government and agency obligations, value 2,989,223 [1]
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 1.062% due 10/05/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 11,000,000 [1],[4]
Total short-term U.S. government and agency obligations, value 10,999,321 [1],[4]
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.991% due 11/30/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 2,000,000 [1],[4]
Total short-term U.S. government and agency obligations, value 1,996,771 [1],[4]
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.972% due 12/07/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 3,000,000 [1],[4]
Total short-term U.S. government and agency obligations, value 2,994,583 [1],[4]
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 1.002% due 01/04/18 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 6,000,000 [1]
Total short-term U.S. government and agency obligations, value 5,984,020 [1]
ProShares UltraShort Silver [Member]  
Schedule of Investments [Line Items]  
Total short-term U.S. government and agency obligations, value 17,966,229
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.962% due 11/30/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 6,000,000 [1],[4]
Total short-term U.S. government and agency obligations, value 5,990,314 [1],[4]
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 1.088% due 10/26/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 4,000,000 [1],[4]
Total short-term U.S. government and agency obligations, value 3,997,507 [1],[4]
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 1.012% due 12/07/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 4,000,000 [1],[4]
Total short-term U.S. government and agency obligations, value 3,992,777 [1],[4]
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 1.040% due 02/01/18 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 4,000,000 [1]
Total short-term U.S. government and agency obligations, value 3,985,631 [1]
ProShares Short Euro [Member]  
Schedule of Investments [Line Items]  
Total short-term U.S. government and agency obligations, value 5,998,433
ProShares Short Euro [Member] | U.S. Treasury Bills 1.089% due 10/12/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 6,000,000 [1]
Total short-term U.S. government and agency obligations, value 5,998,433 [1]
ProShares UltraShort Australian Dollar [Member]  
Schedule of Investments [Line Items]  
Total short-term U.S. government and agency obligations, value 7,997,911
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 1.089% due 10/12/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 8,000,000 [1]
Total short-term U.S. government and agency obligations, value 7,997,911 [1]
ProShares UltraShort Euro [Member]  
Schedule of Investments [Line Items]  
Total short-term U.S. government and agency obligations, value 219,684,550
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.998% due 10/05/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 9,000,000 [1]
Total short-term U.S. government and agency obligations, value 8,999,445 [1]
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.987% due 12/14/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 18,000,000 [1],[5]
Total short-term U.S. government and agency obligations, value 17,964,959 [1],[5]
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 1.001% due 01/11/18 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 25,000,000 [1]
Total short-term U.S. government and agency obligations, value 24,929,510 [1]
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 1.002% due 01/04/18 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 7,000,000 [1]
Total short-term U.S. government and agency obligations, value 6,981,357 [1]
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 1.057% due 10/12/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 40,000,000 [1],[5]
Total short-term U.S. government and agency obligations, value 39,989,556 [1],[5]
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 1.013% due 10/19/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 11,000,000 [1],[5]
Total short-term U.S. government and agency obligations, value 10,995,221 [1],[5]
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 1.015% due 10/26/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 41,000,000 [1],[5]
Total short-term U.S. government and agency obligations, value 40,974,445 [1],[5]
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.998% due 11/02/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 10,000,000 [1]
Total short-term U.S. government and agency obligations, value 9,991,776 [1]
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 1.079% due 11/09/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 20,000,000 [1],[5]
Total short-term U.S. government and agency obligations, value 19,979,734 [1],[5]
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.982% due 11/16/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 2,000,000 [1],[5]
Total short-term U.S. government and agency obligations, value 1,997,613 [1],[5]
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.962% due 11/30/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 7,000,000 [1],[5]
Total short-term U.S. government and agency obligations, value 6,988,700 [1],[5]
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 1.040% due 02/01/18 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 30,000,000 [1]
Total short-term U.S. government and agency obligations, value 29,892,234 [1]
ProShares UltraShort Yen [Member]  
Schedule of Investments [Line Items]  
Total short-term U.S. government and agency obligations, value 137,818,917
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.998% due 10/05/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 15,000,000 [1]
Total short-term U.S. government and agency obligations, value 14,999,075 [1]
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 1.001% due 01/11/18 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 9,000,000 [1]
Total short-term U.S. government and agency obligations, value 8,974,624 [1]
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.992% due 10/26/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 9,000,000 [1]
Total short-term U.S. government and agency obligations, value 8,994,390 [1]
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 1.079% due 11/09/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 25,000,000 [1],[5]
Total short-term U.S. government and agency obligations, value 24,974,667 [1],[5]
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.962% due 11/30/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 17,000,000 [1],[5]
Total short-term U.S. government and agency obligations, value 16,972,557 [1],[5]
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 1.040% due 02/01/18 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 24,000,000 [1]
Total short-term U.S. government and agency obligations, value 23,913,787 [1]
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 1.075% due 10/12/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 39,000,000 [1],[5]
Total short-term U.S. government and agency obligations, value 38,989,817 [1],[5]
ProShares Ultra Bloomberg Crude Oil [Member]  
Schedule of Investments [Line Items]  
Total short-term U.S. government and agency obligations, value 562,359,737
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.987% due 12/14/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 22,000,000 [1],[3]
Total short-term U.S. government and agency obligations, value 21,957,173 [1],[3]
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.001% due 01/11/18 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 40,000,000 [1]
Total short-term U.S. government and agency obligations, value 39,887,216 [1]
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.002% due 01/04/18 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 40,000,000 [1]
Total short-term U.S. government and agency obligations, value 39,893,468 [1]
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.089% due 10/12/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 50,000,000 [1]
Total short-term U.S. government and agency obligations, value 49,986,945 [1]
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.053% due 10/05/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 43,000,000 [1]
Total short-term U.S. government and agency obligations, value 42,997,347 [1]
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.077% due 10/19/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 78,000,000 [1],[3]
Total short-term U.S. government and agency obligations, value 77,966,117 [1],[3]
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.055% due 10/26/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 92,000,000 [1],[3]
Total short-term U.S. government and agency obligations, value 91,942,656 [1],[3]
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.062% due 11/02/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 45,000,000 [1],[3]
Total short-term U.S. government and agency obligations, value 44,962,992 [1],[3]
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.077% due 11/09/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 52,000,000 [1],[3]
Total short-term U.S. government and agency obligations, value 51,947,309 [1],[3]
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.977% due 11/16/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 27,000,000 [1],[3]
Total short-term U.S. government and agency obligations, value 26,967,770 [1],[3]
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.982% due 11/30/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 49,000,000 [1],[3]
Total short-term U.S. government and agency obligations, value 48,920,899 [1],[3]
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.970% due 12/07/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 11,000,000 [1],[3]
Total short-term U.S. government and agency obligations, value 10,980,136 [1],[3]
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.040% due 02/01/18 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 14,000,000 [1]
Total short-term U.S. government and agency obligations, value 13,949,709 [1]
ProShares Ultra Bloomberg Natural Gas [Member]  
Schedule of Investments [Line Items]  
Total short-term U.S. government and agency obligations, value 42,919,932
ProShares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 1.013% due 11/02/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 5,000,000 [1]
Total short-term U.S. government and agency obligations, value 4,995,888 [1]
ProShares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 1.023% due 11/09/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 2,000,000 [1]
Total short-term U.S. government and agency obligations, value 1,997,973 [1]
ProShares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.987% due 12/14/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 7,000,000 [1]
Total short-term U.S. government and agency obligations, value 6,986,373 [1]
ProShares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 1.001% due 01/11/18 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 9,000,000 [1]
Total short-term U.S. government and agency obligations, value 8,974,624 [1]
ProShares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 1.040% due 02/01/18 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 8,000,000 [1]
Total short-term U.S. government and agency obligations, value 7,971,262 [1]
ProShares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.992% due 10/26/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 7,000,000 [1]
Total short-term U.S. government and agency obligations, value 6,995,637 [1]
ProShares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 1.013% due 10/19/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 3,000,000 [1]
Total short-term U.S. government and agency obligations, value 2,998,697 [1]
ProShares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 1.108% due 10/12/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 2,000,000 [1]
Total short-term U.S. government and agency obligations, value 1,999,478 [1]
ProShares Ultra Gold [Member]  
Schedule of Investments [Line Items]  
Total short-term U.S. government and agency obligations, value 101,900,580
ProShares Ultra Gold [Member] | U.S. Treasury Bills 0.987% due 12/14/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 12,000,000 [1],[4]
Total short-term U.S. government and agency obligations, value 11,976,639 [1],[4]
ProShares Ultra Gold [Member] | U.S. Treasury Bills 1.001% due 01/11/18 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 12,000,000 [1]
Total short-term U.S. government and agency obligations, value 11,966,165 [1]
ProShares Ultra Gold [Member] | U.S. Treasury Bills 1.023% due 12/07/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 10,000,000 [1],[4]
Total short-term U.S. government and agency obligations, value 9,981,942 [1],[4]
ProShares Ultra Gold [Member] | U.S. Treasury Bills 1.013% due 10/19/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 12,000,000 [1],[4]
Total short-term U.S. government and agency obligations, value 11,994,787 [1],[4]
ProShares Ultra Gold [Member] | U.S. Treasury Bills 1.079% due 11/09/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 10,000,000 [1],[4]
Total short-term U.S. government and agency obligations, value 9,989,867 [1],[4]
ProShares Ultra Gold [Member] | U.S. Treasury Bills 1.018% due 10/05/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 16,000,000 [1]
Total short-term U.S. government and agency obligations, value 15,999,013 [1]
ProShares Ultra Gold [Member] | U.S. Treasury Bills 1.046% due 10/12/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 30,000,000 [1],[4]
Total short-term U.S. government and agency obligations, value 29,992,167 [1],[4]
ProShares Ultra Silver [Member]  
Schedule of Investments [Line Items]  
Total short-term U.S. government and agency obligations, value 270,629,525
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.962% due 11/30/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 12,000,000 [1],[4]
Total short-term U.S. government and agency obligations, value 11,980,629 [1],[4]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 1.001% due 01/11/18 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 15,000,000 [1]
Total short-term U.S. government and agency obligations, value 14,957,706 [1]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 1.040% due 02/01/18 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 14,000,000 [1]
Total short-term U.S. government and agency obligations, value 13,949,709 [1]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 1.002% due 01/04/18 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 9,000,000 [1]
Total short-term U.S. government and agency obligations, value 8,976,030 [1]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 1.013% due 10/19/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 20,000,000 [1],[4]
Total short-term U.S. government and agency obligations, value 19,991,312 [1],[4]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 1.079% due 11/09/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 13,000,000 [1],[4]
Total short-term U.S. government and agency obligations, value 12,986,827 [1],[4]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.977% due 11/16/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 7,000,000 [1],[4]
Total short-term U.S. government and agency obligations, value 6,991,644 [1],[4]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 1.015% due 10/05/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 23,000,000 [1]
Total short-term U.S. government and agency obligations, value 22,998,581 [1]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 1.056% due 10/12/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 31,000,000 [1],[4]
Total short-term U.S. government and agency obligations, value 30,991,906 [1],[4]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 1.036% due 10/26/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 26,000,000 [1],[4]
Total short-term U.S. government and agency obligations, value 25,983,794 [1],[4]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 1.076% due 11/02/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 11,000,000 [1],[4]
Total short-term U.S. government and agency obligations, value 10,990,954 [1],[4]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 1.004% due 12/07/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 40,000,000 [1],[4]
Total short-term U.S. government and agency obligations, value 39,927,768 [1],[4]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.987% due 12/14/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 50,000,000 [1],[4]
Total short-term U.S. government and agency obligations, value 49,902,665 [1],[4]
ProShares Ultra Euro [Member]  
Schedule of Investments [Line Items]  
Total short-term U.S. government and agency obligations, value 10,995,765
ProShares Ultra Euro [Member] | U.S. Treasury Bills 1.070% due 10/19/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 5,000,000 [1],[5]
Total short-term U.S. government and agency obligations, value 4,997,331 [1],[5]
ProShares Ultra Euro [Member] | U.S. Treasury Bills 1.025% due 10/12/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 6,000,000 [1],[5]
Total short-term U.S. government and agency obligations, value 5,998,434 [1],[5]
ProShares Ultra Yen [Member]  
Schedule of Investments [Line Items]  
Total short-term U.S. government and agency obligations, value 4,662,411
ProShares Ultra Yen [Member] | U.S. Treasury Bills 0.962% due 11/30/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 2,000,000 [1]
Total short-term U.S. government and agency obligations, value 1,996,771 [1]
ProShares Ultra Yen [Member] | U.S. Treasury Bills 1.040% due 02/01/18 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 2,000,000 [1]
Total short-term U.S. government and agency obligations, value 1,992,816 [1]
ProShares Ultra Yen [Member] | U.S. Treasury Bills 1.089% due 10/12/17 [Member]  
Schedule of Investments [Line Items]  
Principal Amount 673,000 [1],[5]
Total short-term U.S. government and agency obligations, value $ 672,824 [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.