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STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (USD $)
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ProShares UltraShort DJ-UBS Commodity [Member]
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ProShares UltraShort DJ-UBS Crude Oil [Member]
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ProShares UltraShort DJ-UBS Natural Gas [Member]
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ProShares UltraShort Gold [Member]
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ProShares UltraShort Silver [Member]
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ProShares Short Euro [Member]
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ProShares UltraShort Australian Dollar [Member]
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ProShares UltraShort Euro [Member]
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ProShares UltraShort Yen [Member]
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ProShares Ultra DJ-UBS Commodity [Member]
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ProShares Ultra DJ-UBS Crude Oil [Member]
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ProShares Ultra DJ-UBS Natural Gas [Member]
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ProShares Ultra Gold [Member]
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ProShares Ultra Silver [Member]
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ProShares Ultra Australian Dollar [Member]
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ProShares Ultra Euro [Member]
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ProShares Ultra Yen [Member]
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ProShares VIX Short-Term Futures ETF [Member]
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ProShares VIX Mid-Term Futures ETF [Member]
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ProShares Ultra VIX Short-Term Futures ETF [Member]
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ProShares Short VIX Short-Term Futures ETF [Member]
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ProShares Trust II [Member]
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| Beginning balance at Dec. 31, 2012 | $ 3,245,965 | $ 89,481,266 | $ 12,768,340 | $ 92,416,742 | $ 100,656,703 | $ 3,763,040 | $ 3,780,999 | $ 526,778,026 | $ 408,563,630 | $ 6,097,211 | $ 483,508,964 | $ 73,019,370 | $ 335,054,752 | $ 747,725,400 | $ 4,150,068 | $ 4,870,316 | $ 4,227,995 | $ 137,657,464 | $ 37,302,992 | $ 84,716,132 | $ 82,663,633 | $ 3,242,449,608 | |||||||||||
| Addition of shares | 87,772,570 | 19,490,998 | 16,775,145 | 27,224,574 | 40,321,956 | 65,406,144 | 24,265,179 | 35,932,249 | 7,641,793 | 85,740,606 | 1,323,474 | 194,612,182 | 51,106,840 | 626,143,856 | 116,697,172 | 1,400,454,738 | |||||||||||||||||
| Redemption of shares | (28,133,016) | (1,383,116) | (9,881,815) | (31,911,371) | (73,520,826) | (62,493,620) | (1,275,613) | (218,628,671) | (81,111,888) | (7,301,114) | (1,180,652) | (50,019,401) | (9,572,962) | (221,613,980) | (158,975,995) | (957,004,640) | |||||||||||||||||
| Net addition (redemption) of shares | 59,639,554 | 18,107,882 | 6,893,330 | (4,686,797) | (33,198,870) | 2,912,524 | (194,363,492) | (45,179,639) | 78,439,492 | 142,822 | 144,592,781 | 41,533,878 | 404,529,876 | (42,278,823) | 443,450,098 | ||||||||||||||||||
| Net investment income (loss) | (6,860) | (321,310) | (43,566) | (210,717) | (228,180) | (8,405) | [1] | (8,669) | [2] | (1,093,113) | (935,606) | (11,629) | (792,030) | (197,871) | (703,550) | (1,624,407) | (9,492) | [2] | (10,724) | (10,060) | (327,343) | (97,496) | (1,072,705) | (213,419) | (7,927,152) | ||||||||
| Net realized gain (loss) | 308,500 | (6,125,829) | (1,773,525) | 12,883,068 | 29,205,653 | (7,858) | [1] | 112,165 | [2] | (2,950,073) | 96,885,635 | (508,881) | 66,563,292 | 5,749,387 | (50,412,546) | (215,674,335) | (149,370) | [2] | (65,348) | (1,217,929) | (55,410,711) | (10,259,685) | (122,685,938) | 25,204,187 | (230,330,141) | ||||||||
| Change in net unrealized appreciation/depreciation | (241,608) | (1,501,047) | (3,906,112) | (6,991,988) | (19,068,251) | 116,609 | [1] | (195,319) | [2] | 26,812,281 | (35,385,357) | 421,243 | (28,749,402) | 17,862,843 | 24,882,532 | 137,618,617 | 223,800 | [2] | (221,177) | 423,575 | (8,124,712) | (407,239) | (21,090,969) | 3,774,229 | 86,252,548 | ||||||||
| Net income (loss) | 60,032 | (7,948,186) | (5,723,203) | 5,680,363 | 9,909,222 | 100,346 | [1],[3] | (91,823) | [2],[4] | 22,769,095 | 60,564,672 | (99,267) | 37,021,860 | 23,414,359 | (26,233,564) | (79,680,125) | 64,938 | [2],[4] | (297,249) | (804,414) | (63,862,766) | (10,764,420) | (144,849,612) | 28,764,997 | (152,004,745) | ||||||||
| Redemptions related to de-registration | 600 | ||||||||||||||||||||||||||||||||
| Ending balance at Mar. 31, 2013 | $ 3,305,997 | $ 141,172,634 | $ 25,153,019 | $ 104,990,435 | $ 105,879,128 | $ 3,863,386 | $ 3,689,176 | $ 516,348,251 | $ 472,040,826 | $ 4,722,331 | $ 326,167,332 | $ 51,254,090 | $ 316,462,981 | $ 746,484,767 | $ 4,215,006 | $ 4,573,067 | $ 3,566,403 | $ 218,387,479 | $ 68,072,450 | $ 344,396,396 | $ 69,149,807 | $ 3,533,894,961 | |||||||||||
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