v2.4.0.8
Statements of Financial Condition (Parenthetical) (USD $)
Jun. 30, 2014
Dec. 31, 2013
ProShares UltraShort Bloomberg Commodity [Member]
   
Short-term U.S. government and agency obligations, cost $ 2,975,653 $ 3,453,851
ProShares UltraShort Bloomberg Crude Oil [Member]
   
Short-term U.S. government and agency obligations, cost 364,432,294 247,573,678
ProShares UltraShort Bloomberg Natural Gas [Member]
   
Short-term U.S. government and agency obligations, cost 44,128,238 18,274,602
ProShares UltraShort Gold [Member]
   
Short-term U.S. government and agency obligations, cost 94,198,546 148,987,995
ProShares UltraShort Silver [Member]
   
Short-term U.S. government and agency obligations, cost 62,533,634 114,822,672
ProShares Short Euro [Member]
   
Short-term U.S. government and agency obligations, cost 12,789,830 7,901,405
ProShares UltraShort Australian Dollar [Member]
   
Short-term U.S. government and agency obligations, cost 17,768,447 24,197,046
ProShares UltraShort Euro [Member]
   
Short-term U.S. government and agency obligations, cost 445,858,348 437,821,545
ProShares UltraShort Yen [Member]
   
Short-term U.S. government and agency obligations, cost 363,182,251 558,563,134
ProShares Ultra Bloomberg Commodity [Member]
   
Short-term U.S. government and agency obligations, cost 3,166,718 2,816,627
ProShares Ultra Bloomberg Crude Oil [Member]
   
Short-term U.S. government and agency obligations, cost 92,958,183 137,423,179
ProShares Ultra Bloomberg Natural Gas [Member]
   
Short-term U.S. government and agency obligations, cost 15,519,408 58,918,095
ProShares Ultra Gold [Member]
   
Short-term U.S. government and agency obligations, cost 122,189,443 140,884,104
ProShares Ultra Silver [Member]
   
Short-term U.S. government and agency obligations, cost 424,513,295 467,849,038
ProShares Ultra Australian Dollar [Member]
   
Short-term U.S. government and agency obligations, cost 3,087,469 2,716,026
ProShares Ultra Euro [Member]
   
Short-term U.S. government and agency obligations, cost 2,486,757 2,455,715
ProShares Ultra Yen [Member]
   
Short-term U.S. government and agency obligations, cost 1,479,851 2,928,242
ProShares VIX Short-Term Futures ETF [Member]
   
Short-term U.S. government and agency obligations, cost 77,583,175 207,628,319
ProShares VIX Mid-Term Futures ETF [Member]
   
Short-term U.S. government and agency obligations, cost 34,381,059 46,039,268
ProShares Ultra VIX Short-Term Futures ETF [Member]
   
Short-term U.S. government and agency obligations, cost 177,917,757 109,530,861
ProShares Short VIX Short-Term Futures ETF [Member]
   
Short-term U.S. government and agency obligations, cost 150,294,074 105,554,675
ProShares Trust II [Member]
   
Short-term U.S. government and agency obligations, cost $ 2,513,444,430 $ 2,846,340,077