v2.4.0.6
Schedule Of Investments (Short-Term U.S. Government And Agency Obligations) (Detail) (USD $)
Mar. 31, 2013
ProShares UltraShort DJ-UBS Commodity [Member]
  
Schedule of Investments [Line Items]  
Value $ 3,062,812
ProShares UltraShort DJ-UBS Commodity [Member] | U.S. Treasury Bills 0.096% Due 04/18/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 1,232,000 [1]
Value 1,231,980 [1]
ProShares UltraShort DJ-UBS Commodity [Member] | U.S. Treasury Bills 0.101% Due 05/16/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 1,413,000 [1]
Value 1,412,903 [1]
ProShares UltraShort DJ-UBS Commodity [Member] | U.S. Treasury Bills 0.072% due 06/27/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 418,000
Value 417,929
ProShares UltraShort DJ-UBS Crude Oil [Member]
  
Schedule of Investments [Line Items]  
Value 145,473,612
ProShares UltraShort DJ-UBS Crude Oil [Member] | U.S. Treasury Bills 0.055% Due 04/11/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 14,902,000
Value 14,901,876
ProShares UltraShort DJ-UBS Crude Oil [Member] | U.S. Treasury Bills 0.071% Due 04/18/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 63,145,000
Value 63,143,956
ProShares UltraShort DJ-UBS Crude Oil [Member] | U.S. Treasury Bills 0.074% Due 04/25/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 42,353,000 [1]
Value 42,352,012 [1]
ProShares UltraShort DJ-UBS Crude Oil [Member] | U.S. Treasury Bills 0.098% Due 05/16/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 107,000
Value 106,993
ProShares UltraShort DJ-UBS Crude Oil [Member] | U.S. Treasury Bills 0.084% Due 06/27/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 24,973,000 [1]
Value 24,968,775 [1]
ProShares UltraShort DJ-UBS Natural Gas [Member]
  
Schedule of Investments [Line Items]  
Value 21,193,216
ProShares UltraShort DJ-UBS Natural Gas [Member] | U.S. Treasury Bills 0.055% Due 04/11/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 573,000
Value 572,995
ProShares UltraShort DJ-UBS Natural Gas [Member] | U.S. Treasury Bills 0.091% due 04/18/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 744,000
Value 743,988
ProShares UltraShort DJ-UBS Natural Gas [Member] | U.S. Treasury Bills 0.050% Due 04/25/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 1,395,000
Value 1,394,967
ProShares UltraShort DJ-UBS Natural Gas [Member] | United States Treasury Bills 0.101% due 05/16/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 3,906,000
Value 3,905,732
ProShares UltraShort DJ-UBS Natural Gas [Member] | U.S. Treasury Bills 0.071% Due 06/27/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 14,578,000
Value 14,575,534
ProShares UltraShort Gold [Member]
  
Schedule of Investments [Line Items]  
Value 108,157,077
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.055% Due 04/11/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 11,800,000
Value 11,799,902
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.060% due 04/18/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 62,387,000 [2]
Value 62,385,969 [2]
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.062% due 04/25/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 8,084,000 [2]
Value 8,083,811 [2]
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.110% due 05/16/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 7,714,000
Value 7,713,470
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.087% due 06/27/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 18,177,000 [2]
Value 18,173,925 [2]
ProShares UltraShort Silver [Member]
  
Schedule of Investments [Line Items]  
Value 105,347,243
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.084% due 04/18/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 58,244,000 [2]
Value 58,243,037 [2]
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.063% Due 04/25/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 14,290,000 [2]
Value 14,289,667 [2]
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.105% Due 05/16/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 10,868,000
Value 10,867,253
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.093% due 06/27/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 21,951,000 [2]
Value 21,947,286 [2]
ProShares Short Euro [Member]
  
Schedule of Investments [Line Items]  
Value 3,371,965
ProShares Short Euro [Member] | U.S. Treasury Bills 0.101% Due 05/16/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 107,000
Value 106,992
ProShares Short Euro [Member] | U.S. Treasury Bills 0.055% Due 04/11/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 3,265,000
Value 3,264,973
ProShares UltraShort Australian Dollar [Member]
  
Schedule of Investments [Line Items]  
Value 3,329,970
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 0.055% Due 04/11/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 3,207,000
Value 3,206,973
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 0.050% Due 04/25/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 123,000
Value 122,997
ProShares UltraShort Euro [Member]
  
Schedule of Investments [Line Items]  
Value 507,190,542
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.055% Due 04/11/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 31,710,000
Value 31,709,736
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.054% Due 04/18/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 129,315,000
Value 129,312,863
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.068% Due 04/25/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 251,253,000 [3]
Value 251,247,138 [3]
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.104% Due 05/16/13[Member]
  
Schedule of Investments [Line Items]  
Principal amount 58,398,000
Value 58,393,985
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.095% Due 06/27/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 36,533,000 [3]
Value 36,526,820 [3]
ProShares UltraShort Yen [Member]
  
Schedule of Investments [Line Items]  
Value 463,617,695
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.055% Due 04/11/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 87,442,000
Value 87,441,272
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.063% Due 04/25/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 155,705,000 [3]
Value 155,701,367 [3]
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.105% Due 05/16/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 19,996,000
Value 19,994,625
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.056% Due 04/18/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 139,862,000
Value 139,859,688
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.079% Due 06/27/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 60,631,000 [3]
Value 60,620,743 [3]
ProShares Ultra DJ-UBS Commodity [Member]
  
Schedule of Investments [Line Items]  
Value 3,350,652
ProShares Ultra DJ-UBS Commodity [Member] | U.S. Treasury Bills 0.050% Due 04/25/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 374,000 [1]
Value 373,991 [1]
ProShares Ultra DJ-UBS Commodity [Member] | U.S. Treasury Bills 0.105% Due 05/16/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 406,000
Value 405,972
ProShares Ultra DJ-UBS Commodity [Member] | U.S. Treasury Bills 0.056% Due 04/18/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 808,000 [1]
Value 807,987 [1]
ProShares Ultra DJ-UBS Commodity [Member] | U.S. Treasury Bills 0.076% Due 06/27/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 1,763,000
Value 1,762,702
ProShares Ultra DJ-UBS Crude Oil [Member]
  
Schedule of Investments [Line Items]  
Value 304,000,111
ProShares Ultra DJ-UBS Crude Oil [Member] | U.S. Treasury Bills 0.055% Due 04/11/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 11,421,000
Value 11,420,905
ProShares Ultra DJ-UBS Crude Oil [Member] | U.S. Treasury Bills 0.105% Due 05/16/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 23,258,000
Value 23,256,401
ProShares Ultra DJ-UBS Crude Oil [Member] | U.S. Treasury Bills 0.079% Due 06/27/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 36,403,000 [1]
Value 36,396,842 [1]
ProShares Ultra DJ-UBS Crude Oil [Member] | U.S. Treasury Bills 0.103% Due 04/18/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 58,434,000
Value 58,433,034
ProShares Ultra DJ-UBS Crude Oil [Member] | U.S. Treasury Bills 0.055% Due 04/25/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 174,497,000 [1]
Value 174,492,929 [1]
ProShares Ultra DJ-UBS Natural Gas [Member]
  
Schedule of Investments [Line Items]  
Value 53,702,179
ProShares Ultra DJ-UBS Natural Gas [Member] | U.S. Treasury Bills 0.103% Due 04/18/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 1,097,000
Value 1,096,982
ProShares Ultra DJ-UBS Natural Gas [Member] | U.S. Treasury Bills 0.059% Due 04/25/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 13,254,000
Value 13,253,691
ProShares Ultra DJ-UBS Natural Gas [Member] | U.S. Treasury Bills 0.103% Due 05/16/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 21,550,000
Value 21,548,518
ProShares Ultra DJ-UBS Natural Gas [Member] | U.S. Treasury Bills 0.082% Due 06/27/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 17,806,000
Value 17,802,988
ProShares Ultra Gold [Member]
  
Schedule of Investments [Line Items]  
Value 307,384,042
ProShares Ultra Gold [Member] | U.S. Treasury Bills 0.050% Due 04/25/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 10,986,000 [2]
Value 10,985,744 [2]
ProShares Ultra Gold [Member] | U.S. Treasury Bills 0.056% Due 04/18/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 45,428,000 [2]
Value 45,427,249 [2]
ProShares Ultra Gold [Member] | U.S. Treasury Bills 0.076% Due 06/27/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 146,331,000
Value 146,306,245
ProShares Ultra Gold [Member] | U.S. Treasury Bills 0.094% Due 05/16/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 104,672,000 [2]
Value 104,664,804 [2]
ProShares Ultra Silver [Member]
  
Schedule of Investments [Line Items]  
Value 754,961,358
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.105% Due 05/16/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 273,524,000 [2]
Value 273,505,195 [2]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.055% Due 04/25/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 144,956,000 [2]
Value 144,952,618 [2]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.069% Due 04/11/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 264,072,000 [2]
Value 264,069,800 [2]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.078% Due 06/27/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 72,446,000 [2]
Value 72,433,745 [2]
ProShares Ultra Australian Dollar [Member]
  
Schedule of Investments [Line Items]  
Value 3,676,902
ProShares Ultra Australian Dollar [Member] | U.S. Treasury Bills 0.055% Due 04/11/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 82,000
Value 81,999
ProShares Ultra Australian Dollar [Member] | U.S. Treasury Bills 0.105% Due 05/16/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 370,000
Value 369,974
ProShares Ultra Australian Dollar [Member] | U.S. Treasury Bills 0.051% Due 04/18/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 3,096,000
Value 3,095,949
ProShares Ultra Australian Dollar [Member] | U.S. Treasury Bills 0.065% Due 04/25/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 10,000
Value 10,000
ProShares Ultra Australian Dollar [Member] | U.S. Treasury Bills 0.070% Due 06/27/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 119,000
Value 118,980
ProShares Ultra Euro [Member]
  
Schedule of Investments [Line Items]  
Value 4,478,920
ProShares Ultra Euro [Member] | U.S. Treasury Bills 0.105% Due 05/16/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 46,000
Value 45,997
ProShares Ultra Euro [Member] | U.S. Treasury Bills 0.056% Due 04/18/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 3,854,000 [3]
Value 3,853,936 [3]
ProShares Ultra Euro [Member] | U.S. Treasury Bills 0.058% Due 04/25/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 579,000 [3]
Value 578,987 [3]
ProShares Ultra Yen [Member]
  
Schedule of Investments [Line Items]  
Value 3,534,934
ProShares Ultra Yen [Member] | U.S. Treasury Bills 0.105% Due 05/16/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 140,000
Value 139,990
ProShares Ultra Yen [Member] | U.S. Treasury Bills 0.066% Due 04/18/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 3,395,000 [3]
Value 3,394,944 [3]
ProShares VIX Short-Term Futures ETF [Member]
  
Schedule of Investments [Line Items]  
Value 152,936,809
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.050% Due 04/25/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 15,369,000
Value 15,368,641
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.103% Due 04/18/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 37,311,000
Value 37,310,383
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.103% Due 05/16/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 35,438,000
Value 35,435,564
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.070% Due 06/27/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 63,658,000
Value 63,647,231
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.058% Due 04/11/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 1,175,000
Value 1,174,990
ProShares VIX Mid-Term Futures ETF [Member]
  
Schedule of Investments [Line Items]  
Value 49,702,438
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.103% Due 05/16/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 22,064,000
Value 22,062,483
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.078% Due 06/27/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 10,202,000
Value 10,200,274
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.068% Due 04/18/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 12,878,000
Value 12,877,787
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.051% Due 04/25/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 4,562,000
Value 4,561,894
ProShares Ultra VIX Short-Term Futures ETF [Member]
  
Schedule of Investments [Line Items]  
Value 118,784,756
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.101% Due 05/16/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 1,802,000
Value 1,801,876
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.103% Due 04/18/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 6,969,000
Value 6,968,885
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.056% Due 04/11/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 7,541,000
Value 7,540,937
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.052% Due 04/25/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 2,714,000
Value 2,713,937
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.069% Due 06/27/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 99,776,000
Value 99,759,121
ProShares Short VIX Short-Term Futures ETF [Member]
  
Schedule of Investments [Line Items]  
Value 45,830,843
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.072% due 06/27/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 30,947,000
Value 30,941,765
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.103% Due 04/18/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 1,862,000
Value 1,861,969
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.108% Due 04/25/13 [Member]
  
Schedule of Investments [Line Items]  
Principal amount 99,000
Value 98,998
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.096% Due 05/16/13[Member]
  
Schedule of Investments [Line Items]  
Principal amount 12,929,000
Value $ 12,928,111
[1] All or partial amount pledged as collateral for swap agreements.
[2] All or partial amount pledged as collateral for forward agreements.
[3] All or partial amount pledged as collateral for foreign currency forward contracts.