v3.10.0.1
Statements of Operations - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2017
Investment Income          
Interest $ 7,534,434 $ 5,591,540 $ 14,858,313 $ 9,188,100  
Expenses          
Management fee 5,975,995 7,549,242 12,657,056 14,820,126  
Brokerage commissions 1,168,489 1,969,627 3,565,232 3,371,027  
Brokerage fees 120,133   147,190    
Offering costs   73,998 105,643 79,690 [1]  
Limitation by Sponsor   (26,550) (27,133) (30,418)  
Total expenses 7,264,617 9,566,317 16,447,988 18,240,425  
Net investment income (loss) 269,817 (3,974,777) (1,589,675) (9,052,325)  
Net realized gain (loss) on          
Foreign currency forward contracts 29,858,381 (50,239,329) 805,799 (35,541,123)  
Short-term U.S. government and agency obligations 3,515 (10,660) (271,404) (48,632)  
Net realized gain (loss) (92,105,498) (180,686,332) (1,429,012,426) (487,760,396)  
Change in net unrealized appreciation/depreciation on          
Futures contracts 24,097,957 21,378,764 54,193,458 (3,660,008)  
Foreign currency forward contracts (691,879) 20,314,099 8,484,633 (28,897,790)  
Short-term U.S. government and agency obligations 17,578 118,844 260,112 65,920  
Change in net unrealized appreciation/depreciation 55,779,535 1,161,431 40,482,655 (139,255,541)  
Net realized and unrealized gain (loss) (36,325,963) (179,524,901) (1,388,529,771) (627,015,937)  
Net income (loss) (36,056,146) (183,499,678) (1,390,119,446) (636,068,262)  
Futures Contracts [Member]          
Net realized gain (loss) on          
Gain (loss) on sale of derivatives (78,767,295) (33,094,001) (1,480,044,810) (385,348,278)  
Swap Agreements [Member]          
Net realized gain (loss) on          
Gain (loss) on sale of derivatives (33,772,186) (92,063,183) 43,335,610 (93,464,332)  
Change in net unrealized appreciation/depreciation on          
Unrealized gain (loss) on derivatives 39,843,849 4,047,462 17,293,931 (89,654,434)  
Forward Agreements [Member]          
Net realized gain (loss) on          
Gain (loss) on sale of derivatives (9,427,913) (5,279,159) 7,162,379 26,641,969  
Change in net unrealized appreciation/depreciation on          
Unrealized gain (loss) on derivatives (7,487,970) (44,697,738) (39,749,479) (17,109,229)  
ProShares Short Euro [Member]          
Investment Income          
Interest 27,459 22,784 47,026 38,480  
Expenses          
Management fee 19,231 34,086 37,581 70,653  
Brokerage commissions 320 453 603 1,103  
Total expenses 19,551 34,539 38,184 71,756  
Net investment income (loss) 7,908 (11,755) 8,842 (33,276)  
Net realized gain (loss) on          
Short-term U.S. government and agency obligations   (277)   (277)  
Net realized gain (loss) 443,811 (818,040) 64,225 (735,783)  
Change in net unrealized appreciation/depreciation on          
Futures contracts 16,282 (65,818) 253,501 (318,481)  
Short-term U.S. government and agency obligations 766 (231) 881 78  
Change in net unrealized appreciation/depreciation 17,048 (66,049) 254,382 (318,403)  
Net realized and unrealized gain (loss) 460,859 (884,089) 318,607 (1,054,186)  
Net income (loss) 468,767 (895,844) 327,449 (1,087,462)  
ProShares Short Euro [Member] | Futures Contracts [Member]          
Net realized gain (loss) on          
Gain (loss) on sale of derivatives 443,811 (817,763) 64,225 (735,506)  
ProShares Short VIX Short-Term Futures ETF [Member]          
Investment Income          
Interest 1,311,550 1,030,436 3,081,523 1,382,694  
Expenses          
Management fee 1,458,197 1,516,291 3,614,293 2,260,276  
Brokerage commissions 378,374 880,345 1,716,061 1,394,810  
Brokerage fees 120,133   146,922    
Total expenses 1,956,704 2,396,636 5,477,276 3,655,086  
Net investment income (loss) (645,154) (1,366,200) (2,395,753) (2,272,392)  
Net realized gain (loss) on          
Short-term U.S. government and agency obligations 1,119 (7,200) (259,112) (11,258)  
Net realized gain (loss) 56,009,496 182,927,300 (1,827,776,466) 282,816,334  
Change in net unrealized appreciation/depreciation on          
Futures contracts 14,232,558 (24,640,794) (39,569,847) 4,520,180  
Short-term U.S. government and agency obligations (13,111) 22,789 51,865 (1,151)  
Change in net unrealized appreciation/depreciation 14,219,447 (24,618,005) (39,517,982) 4,519,029  
Net realized and unrealized gain (loss) 70,228,943 158,309,295 (1,867,294,448) 287,335,363  
Net income (loss) 69,583,789 156,943,095 (1,869,690,201) 285,062,971  
ProShares Short VIX Short-Term Futures ETF [Member] | Futures Contracts [Member]          
Net realized gain (loss) on          
Gain (loss) on sale of derivatives 56,008,377 182,934,500 (1,827,517,354) 282,827,592  
ProShares Ultra Bloomberg Crude Oil [Member]          
Investment Income          
Interest 1,695,702 1,572,668 3,121,667 2,617,079  
Expenses          
Management fee 1,018,503 2,013,640 2,091,357 3,975,239  
Brokerage commissions 26,970 68,950 45,087 106,267  
Total expenses 1,045,473 2,082,590 2,136,444 4,081,506  
Net investment income (loss) 650,229 (509,922) 985,223 (1,464,427)  
Net realized gain (loss) on          
Short-term U.S. government and agency obligations   (1,238) (6) (6,249)  
Net realized gain (loss) 39,220,725 (168,598,236) 151,738,610 (169,015,334)  
Change in net unrealized appreciation/depreciation on          
Futures contracts 6,521,153 14,488,348 5,343,124 (4,990,300)  
Short-term U.S. government and agency obligations 17,685 28,195 53,468 29,262  
Change in net unrealized appreciation/depreciation 64,095,056 28,789,192 25,587,101 (119,075,048)  
Net realized and unrealized gain (loss) 103,315,781 (139,809,044) 177,325,711 (288,090,382)  
Net income (loss) 103,966,010 (140,318,966) 178,310,934 (289,554,809)  
ProShares Ultra Bloomberg Crude Oil [Member] | Futures Contracts [Member]          
Net realized gain (loss) on          
Gain (loss) on sale of derivatives 13,478,548 (32,269,690) 30,228,816 (34,964,008)  
ProShares Ultra Bloomberg Crude Oil [Member] | Swap Agreements [Member]          
Net realized gain (loss) on          
Gain (loss) on sale of derivatives 25,742,177 (136,327,308) 121,509,800 (134,045,077)  
Change in net unrealized appreciation/depreciation on          
Unrealized gain (loss) on derivatives 57,556,218 14,272,649 20,190,509 (114,114,010)  
ProShares Ultra Bloomberg Natural Gas [Member]          
Investment Income          
Interest 117,918 62,796 253,993 106,835  
Expenses          
Management fee 70,511 99,053 175,110 207,945  
Brokerage commissions 25,636 25,411 49,657 47,065  
Total expenses 96,147 124,464 224,767 255,010  
Net investment income (loss) 21,771 (61,668) 29,226 (148,175)  
Net realized gain (loss) on          
Short-term U.S. government and agency obligations (11) (253) (31) (672)  
Net realized gain (loss) 3,945,951 (4,648,302) 5,080,743 (19,026,437)  
Change in net unrealized appreciation/depreciation on          
Futures contracts (2,369,992) (3,330,323) (7,344,433) (2,429,899)  
Short-term U.S. government and agency obligations 775 (901) 4,217 (408)  
Change in net unrealized appreciation/depreciation (2,369,217) (3,331,224) (7,340,216) (2,430,307)  
Net realized and unrealized gain (loss) 1,576,734 (7,979,526) (2,259,473) (21,456,744)  
Net income (loss) 1,598,505 (8,041,194) (2,230,247) (21,604,919)  
ProShares Ultra Bloomberg Natural Gas [Member] | Futures Contracts [Member]          
Net realized gain (loss) on          
Gain (loss) on sale of derivatives 3,945,962 (4,648,049) 5,080,774 (19,025,765)  
ProShares Ultra Euro [Member]          
Investment Income          
Interest 24,676 24,972 49,755 39,752  
Expenses          
Management fee 21,340 34,480 44,932 64,547  
Total expenses 21,340 34,480 44,932 64,547  
Net investment income (loss) 3,336 (9,508) 4,823 (24,795)  
Net realized gain (loss) on          
Foreign currency forward contracts (1,110,032) 2,035,177 (309,519) 1,406,509  
Short-term U.S. government and agency obligations 7 147 7 147  
Net realized gain (loss) (1,110,025) 2,035,324 (309,512) 1,406,656  
Change in net unrealized appreciation/depreciation on          
Foreign currency forward contracts 46,013 (10,405) (436,206) 883,923  
Short-term U.S. government and agency obligations 333 345 568 536  
Change in net unrealized appreciation/depreciation 46,346 (10,060) (435,638) 884,459  
Net realized and unrealized gain (loss) (1,063,679) 2,025,264 (745,150) 2,291,115  
Net income (loss) (1,060,343) 2,015,756 (740,327) 2,266,320  
ProShares Ultra Gold [Member]          
Investment Income          
Interest 392,349 178,660 704,893 300,135  
Expenses          
Management fee 217,921 225,316 442,935 467,757  
Brokerage commissions 9 10 28 29  
Total expenses 217,930 225,326 442,963 467,786  
Net investment income (loss) 174,419 (46,666) 261,930 (167,651)  
Net realized gain (loss) on          
Short-term U.S. government and agency obligations   653 (172) 548  
Net realized gain (loss) (5,706,990) 8,452,994 2,948,113 17,900,379  
Change in net unrealized appreciation/depreciation on          
Futures contracts (14,680) (5,740) (20,600) 21,960  
Short-term U.S. government and agency obligations (4,670) 3,638 8,535 3,815  
Change in net unrealized appreciation/depreciation (5,803,829) (9,841,138) (10,811,316) (3,440,604)  
Net realized and unrealized gain (loss) (11,510,819) (1,388,144) (7,863,203) 14,459,775  
Net income (loss) (11,336,400) (1,434,810) (7,601,273) 14,292,124  
ProShares Ultra Gold [Member] | Futures Contracts [Member]          
Net realized gain (loss) on          
Gain (loss) on sale of derivatives (1,181) 3,280 6,179 (5,821)  
ProShares Ultra Gold [Member] | Forward Agreements [Member]          
Net realized gain (loss) on          
Gain (loss) on sale of derivatives (5,705,809) 8,449,061 2,942,106 17,905,652  
Change in net unrealized appreciation/depreciation on          
Unrealized gain (loss) on derivatives (5,784,479) (9,839,036) (10,799,251) (3,466,379)  
ProShares Ultra Silver [Member]          
Investment Income          
Interest 928,110 518,829 1,701,974 884,169  
Expenses          
Management fee 541,678 651,232 1,101,124 1,358,786  
Brokerage commissions 21 29 31 39  
Total expenses 541,699 651,261 1,101,155 1,358,825  
Net investment income (loss) 386,411 (132,432) 600,819 (474,656)  
Net realized gain (loss) on          
Short-term U.S. government and agency obligations   97 (372) 198  
Net realized gain (loss) (5,627,237) (10,939,045) 7,174,134 19,262,944  
Change in net unrealized appreciation/depreciation on          
Futures contracts (4,000) (4,740) (9,570) 24,980  
Short-term U.S. government and agency obligations 1,991 12,512 34,993 6,660  
Change in net unrealized appreciation/depreciation (4,041,572) (41,673,877) (35,858,622) (14,398,126)  
Net realized and unrealized gain (loss) (9,668,809) (52,612,922) (28,684,488) 4,864,818  
Net income (loss) (9,282,398) (52,745,354) (28,083,669) 4,390,162  
ProShares Ultra Silver [Member] | Futures Contracts [Member]          
Net realized gain (loss) on          
Gain (loss) on sale of derivatives 3,130 (13,026) (920) (20,826)  
ProShares Ultra Silver [Member] | Forward Agreements [Member]          
Net realized gain (loss) on          
Gain (loss) on sale of derivatives (5,630,367) (10,926,116) 7,175,426 19,283,572  
Change in net unrealized appreciation/depreciation on          
Unrealized gain (loss) on derivatives (4,039,563) (41,681,649) (35,884,045) (14,429,766)  
ProShares Ultra VIX Short-Term Futures ETF [Member]          
Investment Income          
Interest 573,151 595,569 1,239,894 966,554  
Expenses          
Management fee 1,004,304 918,110 1,847,115 1,839,772  
Brokerage commissions 651,493 901,683 1,542,921 1,668,516  
Total expenses 1,655,797 1,819,793 3,390,036 3,508,288  
Net investment income (loss) (1,082,646) (1,224,224) (2,150,142) (2,541,734)  
Net realized gain (loss) on          
Short-term U.S. government and agency obligations 1,878 1,564 (7,731) (20,751)  
Net realized gain (loss) (155,815,226) (153,987,419) 260,784,945 (519,524,922)  
Change in net unrealized appreciation/depreciation on          
Short-term U.S. government and agency obligations (6,630) 11,633 13,265 12,516  
Change in net unrealized appreciation/depreciation 7,064,911 30,330,056 74,541,294 1,737,284  
Net realized and unrealized gain (loss) (148,750,315) (123,657,363) 335,326,239 (517,787,638)  
Net income (loss) (149,832,961) (124,881,587) 333,176,097 (520,329,372)  
ProShares Ultra VIX Short-Term Futures ETF [Member] | Futures Contracts [Member]          
Net realized gain (loss) on          
Gain (loss) on sale of derivatives (118,198,965) (153,988,983) 271,337,181 (519,504,171)  
Change in net unrealized appreciation/depreciation on          
Futures contracts 5,613,735 30,318,423 74,263,549 1,724,768  
ProShares Ultra VIX Short-Term Futures ETF [Member] | Swap Agreements [Member]          
Net realized gain (loss) on          
Gain (loss) on sale of derivatives (37,618,139)   (10,544,505)    
Change in net unrealized appreciation/depreciation on          
Unrealized gain (loss) on derivatives 1,457,806   264,480    
ProShares Ultra Yen [Member]          
Investment Income          
Interest 4,582 6,876 8,736 11,186  
Expenses          
Management fee 7,109 14,326 14,332 27,969  
Total expenses 7,109 14,326 14,332 27,969  
Net investment income (loss) (2,527) (7,450) (5,596) (16,783)  
Net realized gain (loss) on          
Foreign currency forward contracts (299,704) 424,094 22,846 342,583  
Short-term U.S. government and agency obligations       (32)  
Net realized gain (loss) (299,704) 424,094 22,846 342,551  
Change in net unrealized appreciation/depreciation on          
Foreign currency forward contracts 22,366 (590,497) 10,565 (793)  
Short-term U.S. government and agency obligations 202 533 384 471  
Change in net unrealized appreciation/depreciation 22,568 (589,964) 10,949 (322)  
Net realized and unrealized gain (loss) (277,136) (165,870) 33,795 342,229  
Net income (loss) (279,663) (173,320) 28,199 325,446  
ProShares UltraPro 3x Crude Oil ETF [Member]          
Investment Income          
Interest 2,443   4,988    
Expenses          
Management fee 53,597   55,692    
Brokerage commissions 13,797 10,401 19,473   $ 11,274
Offering costs   36,999 52,846   39,845
Limitation by Sponsor   (6,401) (26,957)   (8,302)
Total expenses 67,394 40,999 101,054   42,817
Net investment income (loss) (64,951) (40,999) (96,066)   (42,817)
Net realized gain (loss) on          
Net realized gain (loss) 1,740,951 (1,832,876) 3,361,776   (1,833,835)
Change in net unrealized appreciation/depreciation on          
Futures contracts 6,901,529 (272,129) 8,487,486   578,453
Change in net unrealized appreciation/depreciation 6,901,529 (272,129) 8,487,486   578,453
Net realized and unrealized gain (loss) 8,642,480 (2,105,005) 11,849,262   (1,255,382)
Net income (loss) 8,577,529 (2,146,004) 11,753,196   (1,298,199)
ProShares UltraPro 3x Crude Oil ETF [Member] | Futures Contracts [Member]          
Net realized gain (loss) on          
Gain (loss) on sale of derivatives 1,740,951 (1,832,876) 3,361,776   (1,833,835)
ProShares UltraPro 3X Short Crude Oil ETF [Member]          
Investment Income          
Interest 2,063   6,267    
Expenses          
Management fee 52,273   55,810    
Brokerage commissions 15,245 6,949 30,505   7,901
Offering costs   36,999 52,797   39,845
Limitation by Sponsor   (20,149) (176)   (22,116)
Total expenses 67,518 23,799 138,936   25,630
Net investment income (loss) (65,455) (23,799) (132,669)   (25,630)
Net realized gain (loss) on          
Net realized gain (loss) (6,793,148) 1,878,109 (11,469,115)   1,772,343
Change in net unrealized appreciation/depreciation on          
Futures contracts (1,707,316) 416,232 (2,454,299)   (245,274)
Change in net unrealized appreciation/depreciation (1,707,316) 416,232 (2,454,299)   (245,274)
Net realized and unrealized gain (loss) (8,500,464) 2,294,341 (13,923,414)   1,527,069
Net income (loss) (8,565,919) 2,270,542 (14,056,083)   1,501,439
ProShares UltraPro 3X Short Crude Oil ETF [Member] | Futures Contracts [Member]          
Net realized gain (loss) on          
Gain (loss) on sale of derivatives (6,793,148) 1,878,109 (11,469,115)   $ 1,772,343
ProShares UltraShort Australian Dollar [Member]          
Investment Income          
Interest 23,124 21,253 44,263 35,524  
Expenses          
Management fee 17,184 34,714 36,668 69,846  
Brokerage commissions 1,190 2,065 2,710 4,533  
Total expenses 18,374 36,779 39,378 74,379  
Net investment income (loss) 4,750 (15,526) 4,885 (38,855)  
Net realized gain (loss) on          
Short-term U.S. government and agency obligations   (155) (247) (155)  
Net realized gain (loss) 415,369 64,821 (704,868) (467,406)  
Change in net unrealized appreciation/depreciation on          
Futures contracts 93,610 (208,036) 1,284,990 (1,640,650)  
Short-term U.S. government and agency obligations 539 570 1,288 857  
Change in net unrealized appreciation/depreciation 94,149 (207,466) 1,286,278 (1,639,793)  
Net realized and unrealized gain (loss) 509,518 (142,645) 581,410 (2,107,199)  
Net income (loss) 514,268 (158,171) 586,295 (2,146,054)  
ProShares UltraShort Australian Dollar [Member] | Futures Contracts [Member]          
Net realized gain (loss) on          
Gain (loss) on sale of derivatives 415,369 64,976 (704,621) (467,251)  
ProShares UltraShort Bloomberg Crude Oil [Member]          
Investment Income          
Interest 789,599 280,496 1,519,016 539,542  
Expenses          
Management fee 429,580 381,832 957,534 917,856  
Brokerage commissions 16,521 19,058 28,502 32,780  
Total expenses 446,101 400,890 986,036 950,636  
Net investment income (loss) 343,498 (120,394) 532,980 (411,094)  
Net realized gain (loss) on          
Short-term U.S. government and agency obligations 545 (1,875) 358 (1,483)  
Net realized gain (loss) (27,662,976) 60,374,329 (75,759,313) 59,224,854  
Change in net unrealized appreciation/depreciation on          
Short-term U.S. government and agency obligations 3,687 14,136 29,049 3,556  
Change in net unrealized appreciation/depreciation (21,638,603) (14,881,070) (6,331,310) 25,048,184  
Net realized and unrealized gain (loss) (49,301,579) 45,493,259 (82,090,623) 84,273,038  
Net income (loss) (48,958,081) 45,372,865 (81,557,643) 83,861,944  
ProShares UltraShort Bloomberg Crude Oil [Member] | Futures Contracts [Member]          
Net realized gain (loss) on          
Gain (loss) on sale of derivatives (5,767,297) 16,112,079 (8,129,986) 18,645,592  
Change in net unrealized appreciation/depreciation on          
Futures contracts (2,472,115) (4,670,019) (3,199,301) 585,052  
ProShares UltraShort Bloomberg Crude Oil [Member] | Swap Agreements [Member]          
Net realized gain (loss) on          
Gain (loss) on sale of derivatives (21,896,224) 44,264,125 (67,629,685) 40,580,745  
Change in net unrealized appreciation/depreciation on          
Unrealized gain (loss) on derivatives (19,170,175) (10,225,187) (3,161,058) 24,459,576  
ProShares UltraShort Bloomberg Natural Gas [Member]          
Investment Income          
Interest 15,929 9,532 31,067 14,473  
Expenses          
Management fee 12,902 17,846 29,447 33,091  
Brokerage commissions 5,591 6,845 13,771 12,357  
Total expenses 18,493 24,691 43,218 45,448  
Net investment income (loss) (2,564) (15,159) (12,151) (30,975)  
Net realized gain (loss) on          
Short-term U.S. government and agency obligations       (259)  
Net realized gain (loss) (759,484) 49,239 (12,513) 1,907,361  
Change in net unrealized appreciation/depreciation on          
Futures contracts 171,317 881,105 1,103,321 215,351  
Short-term U.S. government and agency obligations 273 (181) 189 (306)  
Change in net unrealized appreciation/depreciation 171,590 880,924 1,103,510 215,045  
Net realized and unrealized gain (loss) (587,894) 930,163 1,090,997 2,122,406  
Net income (loss) (590,458) 915,004 1,078,846 2,091,431  
ProShares UltraShort Bloomberg Natural Gas [Member] | Futures Contracts [Member]          
Net realized gain (loss) on          
Gain (loss) on sale of derivatives (759,484) 49,239 (12,513) 1,907,620  
ProShares UltraShort Euro [Member]          
Investment Income          
Interest 783,229 508,339 1,401,213 893,083  
Expenses          
Management fee 460,782 633,812 910,637 1,377,577  
Total expenses 460,782 633,812 910,637 1,377,577  
Net investment income (loss) 322,447 (125,473) 490,576 (484,494)  
Net realized gain (loss) on          
Foreign currency forward contracts 22,934,693 (36,508,674) 4,011,451 (20,829,055)  
Short-term U.S. government and agency obligations (47) (837) (228) (2,462)  
Net realized gain (loss) 22,934,646 (36,509,511) 4,011,223 (20,831,517)  
Change in net unrealized appreciation/depreciation on          
Foreign currency forward contracts (342,410) 1,694,586 9,744,219 (22,366,371)  
Short-term U.S. government and agency obligations 7,576 9,774 27,895 3,217  
Change in net unrealized appreciation/depreciation (334,834) 1,704,360 9,772,114 (22,363,154)  
Net realized and unrealized gain (loss) 22,599,812 (34,805,151) 13,783,337 (43,194,671)  
Net income (loss) 22,922,259 (34,930,624) 14,273,913 (43,679,165)  
ProShares UltraShort Gold [Member]          
Investment Income          
Interest 114,979 64,930 205,123 116,347  
Expenses          
Management fee 67,143 83,084 134,889 181,359  
Brokerage commissions 8 10 28 29  
Total expenses 67,151 83,094 134,917 181,388  
Net investment income (loss) 47,828 (18,164) 70,206 (65,041)  
Net realized gain (loss) on          
Short-term U.S. government and agency obligations 24 (71) 152 (1,072)  
Net realized gain (loss) 1,572,944 (3,423,708) (1,696,803) (8,295,869)  
Change in net unrealized appreciation/depreciation on          
Futures contracts 14,640 5,740 20,540 (22,000)  
Short-term U.S. government and agency obligations 1,859 (938) 4,028 (735)  
Change in net unrealized appreciation/depreciation 1,881,329 3,810,157 3,789,437 (400,322)  
Net realized and unrealized gain (loss) 3,454,273 386,449 2,092,634 (8,696,191)  
Net income (loss) 3,502,101 368,285 2,162,840 (8,761,232)  
ProShares UltraShort Gold [Member] | Futures Contracts [Member]          
Net realized gain (loss) on          
Gain (loss) on sale of derivatives 1,160 (3,321) (6,140) 5,759  
ProShares UltraShort Gold [Member] | Forward Agreements [Member]          
Net realized gain (loss) on          
Gain (loss) on sale of derivatives 1,571,760 (3,420,316) (1,690,815) (8,300,556)  
Change in net unrealized appreciation/depreciation on          
Unrealized gain (loss) on derivatives 1,864,830 3,805,355 3,764,869 (377,587)  
ProShares UltraShort Silver [Member]          
Investment Income          
Interest 84,825 36,403 143,417 58,906  
Expenses          
Management fee 51,734 50,752 97,129 96,805  
Brokerage commissions 16 19 26 29  
Total expenses 51,750 50,771 97,155 96,834  
Net investment income (loss) 33,075 (14,368) 46,262 (37,928)  
Net realized gain (loss) on          
Short-term U.S. government and agency obligations   (20) (2,032) (144)  
Net realized gain (loss) 334,485 631,092 (1,264,388) (2,226,293)  
Change in net unrealized appreciation/depreciation on          
Futures contracts 4,050 4,790 9,620 (24,930)  
Short-term U.S. government and agency obligations 1,498 376 4,272 (62)  
Change in net unrealized appreciation/depreciation 476,790 3,022,758 3,182,840 1,139,511  
Net realized and unrealized gain (loss) 811,275 3,653,850 1,918,452 (1,086,782)  
Net income (loss) 844,350 3,639,482 1,964,714 (1,124,710)  
ProShares UltraShort Silver [Member] | Futures Contracts [Member]          
Net realized gain (loss) on          
Gain (loss) on sale of derivatives (2,018) 12,900 1,982 20,550  
ProShares UltraShort Silver [Member] | Forward Agreements [Member]          
Net realized gain (loss) on          
Gain (loss) on sale of derivatives 336,503 618,212 (1,264,338) (2,246,699)  
Change in net unrealized appreciation/depreciation on          
Unrealized gain (loss) on derivatives 471,242 3,017,592 3,168,948 1,164,503  
ProShares UltraShort Yen [Member]          
Investment Income          
Interest 358,903 360,252 671,423 683,531  
Expenses          
Management fee 207,241 457,413 438,360 1,092,436  
Total expenses 207,241 457,413 438,360 1,092,436  
Net investment income (loss) 151,662 (97,161) 233,063 (408,905)  
Net realized gain (loss) on          
Foreign currency forward contracts 8,333,424 (16,189,926) (2,918,979) (16,461,160)  
Short-term U.S. government and agency obligations   (1,402) 3 (2,822)  
Net realized gain (loss) 8,333,424 (16,191,328) (2,918,976) (16,463,982)  
Change in net unrealized appreciation/depreciation on          
Foreign currency forward contracts (417,848) 19,220,415 (833,945) (7,414,549)  
Short-term U.S. government and agency obligations 2,983 10,384 15,236 3,499  
Change in net unrealized appreciation/depreciation (414,865) 19,230,799 (818,709) (7,411,050)  
Net realized and unrealized gain (loss) 7,918,559 3,039,471 (3,737,685) (23,875,032)  
Net income (loss) 8,070,221 2,942,310 (3,504,622) (24,283,937)  
ProShares VIX Mid-Term Futures ETF [Member]          
Investment Income          
Interest 48,342 48,327 110,046 92,587  
Expenses          
Management fee 42,445 70,059 97,404 155,244  
Brokerage commissions 3,126 1,409 14,358 5,051  
Total expenses 45,571 71,468 111,762 160,295  
Net investment income (loss) 2,771 (23,141) (1,716) (67,708)  
Net realized gain (loss) on          
Short-term U.S. government and agency obligations   73   (527)  
Net realized gain (loss) 247,018 (7,047,660) 3,967,454 (15,215,578)  
Change in net unrealized appreciation/depreciation on          
Futures contracts (3,080,525) 2,246,125 1,837,040 (1,018,010)  
Short-term U.S. government and agency obligations 911 632 (187) 825  
Change in net unrealized appreciation/depreciation (3,079,614) 2,246,757 1,836,853 (1,017,185)  
Net realized and unrealized gain (loss) (2,832,596) (4,800,903) 5,804,307 (16,232,763)  
Net income (loss) (2,829,825) (4,824,044) 5,802,591 (16,300,471)  
ProShares VIX Mid-Term Futures ETF [Member] | Futures Contracts [Member]          
Net realized gain (loss) on          
Gain (loss) on sale of derivatives 247,018 (7,047,733) 3,967,454 (15,215,051)  
ProShares VIX Short-Term Futures ETF [Member]          
Investment Income          
Interest 235,501 248,418 512,029 407,223  
Expenses          
Management fee 222,320 313,196 474,707 622,968  
Brokerage commissions 30,172 45,990 101,471 79,244  
Brokerage fees     268    
Total expenses 252,492 359,186 576,446 702,212  
Net investment income (loss) (16,991) (110,768) (64,417) (294,989)  
Net realized gain (loss) on          
Short-term U.S. government and agency obligations   134 (1,993) (1,362)  
Net realized gain (loss) (23,529,528) (33,527,509) 53,745,459 (98,756,862)  
Change in net unrealized appreciation/depreciation on          
Futures contracts 177,711 6,215,600 14,188,337 (641,208)  
Short-term U.S. government and agency obligations 911 5,578 10,166 3,290  
Change in net unrealized appreciation/depreciation 178,622 6,221,178 14,198,503 (637,918)  
Net realized and unrealized gain (loss) (23,350,906) (27,306,331) 67,943,962 (99,394,780)  
Net income (loss) (23,367,897) (27,417,099) 67,879,545 (99,689,769)  
ProShares VIX Short-Term Futures ETF [Member] | Futures Contracts [Member]          
Net realized gain (loss) on          
Gain (loss) on sale of derivatives $ (23,529,528) $ (33,527,643) $ 53,747,452 $ (98,755,500)  
[1] The operations include the activity of ProShares UltraPro 3x Crude Oil ETF and ProShares UltraPro 3x Short Crude Oil ETF since January 13, 2017 (inception date).