v3.25.2
Statements of Operations - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Investment Income        
Interest $ 31,608,406 $ 36,592,197 $ 62,559,311 $ 67,381,467
Expenses        
Management fee 8,240,705 7,448,120 16,091,243 14,618,380
Brokerage commissions 1,988,079 1,987,015 4,152,582 3,830,567
Futures account fees 222,750 169,922 549,450 400,385
Total expenses 10,451,534 9,605,057 20,793,275 18,849,332
Net investment income (loss) 21,156,872 26,987,140 41,766,036 48,532,135
Net realized gain (loss) on        
Net realized gain (loss) 406,051,436 340,305,548 653,081,996 140,335,396
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) (256,039,064) (127,143,015) (96,121,534) (180,306,004)
Net realized and unrealized gain (loss) 150,012,372 213,162,533 556,960,462 (39,970,608)
Net income (loss) 171,169,244 240,149,673 598,726,498 8,561,527
Futures Contracts [Member]        
Net realized gain (loss) on        
Net realized gain (loss) 328,054,378 192,957,311 513,310,950 (95,441,709)
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) (165,477,989) (68,861,582) (104,237,226) (169,234,257)
Swap Agreements [Member]        
Net realized gain (loss) on        
Net realized gain (loss) 81,036,670 147,613,685 142,797,216 237,098,199
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) (91,024,244) (58,891,791) 8,077,709 (13,314,347)
Foreign Currency Forward Contracts [Member]        
Net realized gain (loss) on        
Net realized gain (loss) (3,030,481) (266,644) (3,016,969) (1,392,235)
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) 450,161 550,617 163,608 2,368,057
Short-term U.S. Government and Agency Obligations [Member]        
Net realized gain (loss) on        
Net realized gain (loss) (9,131) 1,196 (9,201) 71,141
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) 13,008 59,741 (125,625) (125,457)
ProShares Short VIX Short-Term Futures ETF [Member]        
Investment Income        
Interest 3,664,726 3,457,223 5,820,643 6,766,508
Expenses        
Management fee 973,113 702,645 1,528,502 1,443,041
Brokerage commissions 205,533 170,317 332,745 341,916
Futures account fees 27,459 0 53,156 0
Total expenses 1,206,105 872,962 1,914,403 1,784,957
Net investment income (loss) 2,458,621 2,584,261 3,906,240 4,981,551
Net realized gain (loss) on        
Net realized gain (loss) 2,460 26,761,918 (17,634,393) 55,276,535
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) 13,637,223 (4,167,221) 13,394,285 (8,822,042)
Net realized and unrealized gain (loss) 13,639,683 22,594,697 (4,240,108) 46,454,493
Net income (loss) 16,098,304 25,178,958 (333,868) 51,436,044
ProShares Short VIX Short-Term Futures ETF [Member] | Futures Contracts [Member]        
Net realized gain (loss) on        
Net realized gain (loss) 2,005 26,761,918 (17,634,848) 55,258,866
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) 13,636,368 (4,177,838) 13,401,093 (8,805,425)
ProShares Short VIX Short-Term Futures ETF [Member] | Short-term U.S. Government and Agency Obligations [Member]        
Net realized gain (loss) on        
Net realized gain (loss) 455 0 455 17,669
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) 855 10,617 (6,808) (16,617)
ProShares Ultra Bloomberg Crude Oil [Member]        
Investment Income        
Interest 3,240,612 6,506,199 6,745,716 11,516,649
Expenses        
Management fee 951,694 1,344,787 1,916,607 2,821,804
Brokerage commissions 61,348 42,976 107,916 104,780
Total expenses 1,013,042 1,387,763 2,024,523 2,926,584
Net investment income (loss) 2,227,570 5,118,436 4,721,193 8,590,065
Net realized gain (loss) on        
Net realized gain (loss) (28,591,884) 6,957,617 (13,075,023) 100,088,722
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) (41,335,786) (738,826) (41,800,136) 54,345,016
Net realized and unrealized gain (loss) (69,927,670) 6,218,791 (54,875,159) 154,433,738
Net income (loss) (67,700,100) 11,337,227 (50,153,966) 163,023,803
ProShares Ultra Bloomberg Crude Oil [Member] | Futures Contracts [Member]        
Net realized gain (loss) on        
Net realized gain (loss) (14,353,923) 11,985,445 (3,195,195) 28,452,282
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) (8,595,750) (9,029,300) (7,581,547) 16,397,677
ProShares Ultra Bloomberg Crude Oil [Member] | Swap Agreements [Member]        
Net realized gain (loss) on        
Net realized gain (loss) (14,238,283) (5,028,524) (9,880,150) 71,623,239
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) (32,742,289) 8,281,227 (34,191,987) 37,992,657
ProShares Ultra Bloomberg Crude Oil [Member] | Short-term U.S. Government and Agency Obligations [Member]        
Net realized gain (loss) on        
Net realized gain (loss) 322 696 322 13,201
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) 2,253 9,247 (26,602) (45,318)
ProShares Ultra Bloomberg Natural Gas [Member]        
Investment Income        
Interest 2,079,577 6,418,687 4,980,630 12,870,827
Expenses        
Management fee 548,526 1,323,880 1,251,579 2,773,307
Brokerage commissions 288,858 785,377 571,013 1,488,469
Futures account fees 18,071 53,176 116,609 142,161
Total expenses 855,455 2,162,433 1,939,201 4,403,937
Net investment income (loss) 1,224,122 4,256,254 3,041,429 8,466,890
Net realized gain (loss) on        
Net realized gain (loss) (12,342,333) 211,772,181 210,262,895 (30,408,733)
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) (84,894,992) (60,263,391) (127,033,885) (196,656,346)
Net realized and unrealized gain (loss) (97,237,325) 151,508,790 83,229,010 (227,065,079)
Net income (loss) (96,013,203) 155,765,044 86,270,439 (218,598,189)
ProShares Ultra Bloomberg Natural Gas [Member] | Futures Contracts [Member]        
Net realized gain (loss) on        
Net realized gain (loss) (12,342,109) 211,772,181 210,263,119 (30,408,733)
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) (84,894,683) (60,263,391) (127,006,905) (196,642,739)
ProShares Ultra Bloomberg Natural Gas [Member] | Short-term U.S. Government and Agency Obligations [Member]        
Net realized gain (loss) on        
Net realized gain (loss) (224) 0 (224) 0
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) (309) 0 (26,980) (13,607)
ProShares Ultra Euro [Member]        
Investment Income        
Interest 68,572 70,817 114,044 149,303
Expenses        
Management fee 18,079 13,944 29,891 29,879
Total expenses 18,079 13,944 29,891 29,879
Net investment income (loss) 50,493 56,873 84,153 119,424
Net realized gain (loss) on        
Net realized gain (loss) 616,633 (219,350) 777,150 (74,776)
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) 415,771 62,167 610,648 (447,347)
Net realized and unrealized gain (loss) 1,032,404 (157,183) 1,387,798 (522,123)
Net income (loss) 1,082,897 (100,310) 1,471,951 (402,699)
ProShares Ultra Euro [Member] | Foreign Currency Forward Contracts [Member]        
Net realized gain (loss) on        
Net realized gain (loss) 616,633 (219,350) 777,150 (74,776)
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) 415,771 62,167 610,648 (447,347)
ProShares Ultra Gold [Member]        
Investment Income        
Interest 5,119,975 2,819,359 8,858,522 4,833,274
Expenses        
Management fee 1,197,578 546,388 2,061,122 982,991
Brokerage commissions 26,535 8,123 45,879 17,996
Total expenses 1,224,113 554,511 2,107,001 1,000,987
Net investment income (loss) 3,895,862 2,264,848 6,751,521 3,832,287
Net realized gain (loss) on        
Net realized gain (loss) 86,158,116 31,567,821 144,586,702 50,042,103
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) (61,454,302) (17,226,689) (5,429,584) (14,505,497)
Net realized and unrealized gain (loss) 24,703,814 14,341,132 139,157,118 35,536,606
Net income (loss) 28,599,676 16,605,980 145,908,639 39,368,893
ProShares Ultra Gold [Member] | Futures Contracts [Member]        
Net realized gain (loss) on        
Net realized gain (loss) 42,515,493 7,565,606 71,847,565 14,530,658
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) (33,165,219) (3,144,847) (3,032,218) (4,863,967)
ProShares Ultra Gold [Member] | Swap Agreements [Member]        
Net realized gain (loss) on        
Net realized gain (loss) 43,642,546 24,002,215 72,739,060 35,508,434
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) (28,291,491) (14,087,684) (2,377,888) (9,631,250)
ProShares Ultra Gold [Member] | Short-term U.S. Government and Agency Obligations [Member]        
Net realized gain (loss) on        
Net realized gain (loss) 77 0 77 3,011
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) 2,408 5,842 (19,478) (10,280)
ProShares Ultra Silver [Member]        
Investment Income        
Interest 6,095,350 6,245,723 12,115,255 9,880,580
Expenses        
Management fee 1,485,223 1,244,817 3,001,678 2,118,718
Brokerage commissions 58,272 56,180 104,828 84,222
Total expenses 1,543,495 1,300,997 3,106,506 2,202,940
Net investment income (loss) 4,551,855 4,944,726 9,008,749 7,677,640
Net realized gain (loss) on        
Net realized gain (loss) 99,198,831 220,680,441 153,909,618 216,214,526
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) (73,497,185) (87,279,257) 65,780,286 (65,670,658)
Net realized and unrealized gain (loss) 25,701,646 133,401,184 219,689,904 150,543,868
Net income (loss) 30,253,501 138,345,910 228,698,653 158,221,508
ProShares Ultra Silver [Member] | Futures Contracts [Member]        
Net realized gain (loss) on        
Net realized gain (loss) 45,180,695 81,641,058 68,353,031 76,002,276
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) (39,005,923) (29,355,888) 19,765,588 (19,075,042)
ProShares Ultra Silver [Member] | Swap Agreements [Member]        
Net realized gain (loss) on        
Net realized gain (loss) 54,018,148 139,039,383 85,556,599 140,207,453
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) (34,495,578) (57,934,788) 46,047,534 (46,575,112)
ProShares Ultra Silver [Member] | Short-term U.S. Government and Agency Obligations [Member]        
Net realized gain (loss) on        
Net realized gain (loss) (12) 0 (12) 4,797
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) 4,316 11,419 (32,836) (20,504)
ProShares Ultra VIX Short-Term Futures ETF [Member]        
Investment Income        
Interest 2,804,863 2,335,823 5,692,389 5,094,065
Expenses        
Management fee 906,425 553,814 1,742,735 1,221,345
Brokerage commissions 621,171 454,606 1,508,883 941,152
Futures account fees 126,256 63,964 213,163 150,134
Total expenses 1,653,852 1,072,384 3,464,781 2,312,631
Net investment income (loss) 1,151,011 1,263,439 2,227,608 2,781,434
Net realized gain (loss) on        
Net realized gain (loss) 56,043,330 (57,412,686) 155,964,717 (148,405,278)
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) (88,992,737) 11,698,440 (69,359,376) 24,979,009
Net realized and unrealized gain (loss) (32,949,407) (45,714,246) 86,605,341 (123,426,269)
Net income (loss) (31,798,396) (44,450,807) 88,832,949 (120,644,835)
ProShares Ultra VIX Short-Term Futures ETF [Member] | Futures Contracts [Member]        
Net realized gain (loss) on        
Net realized gain (loss) 56,045,179 (57,413,186) 155,966,636 (148,416,415)
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) (88,993,838) 11,693,863 (69,352,758) 24,978,991
ProShares Ultra VIX Short-Term Futures ETF [Member] | Short-term U.S. Government and Agency Obligations [Member]        
Net realized gain (loss) on        
Net realized gain (loss) (1,849) 500 (1,919) 11,137
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) 1,101 4,577 (6,618) 18
ProShares Ultra Yen [Member]        
Investment Income        
Interest 580,313 483,557 1,108,434 853,811
Expenses        
Management fee 153,765 99,372 290,779 176,608
Total expenses 153,765 99,372 290,779 176,608
Net investment income (loss) 426,548 384,185 817,655 677,203
Net realized gain (loss) on        
Net realized gain (loss) 1,428,203 (5,365,623) 3,070,845 (7,397,198)
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) 2,283,730 (842,412) 4,951,669 (4,421,343)
Net realized and unrealized gain (loss) 3,711,933 (6,208,035) 8,022,514 (11,818,541)
Net income (loss) 4,138,481 (5,823,850) 8,840,169 (11,141,338)
ProShares Ultra Yen [Member] | Foreign Currency Forward Contracts [Member]        
Net realized gain (loss) on        
Net realized gain (loss) 1,428,203 (5,365,623) 3,070,845 (7,397,198)
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) 2,283,730 (842,412) 4,951,669 (4,421,343)
ProShares UltraShort Bloomberg Crude Oil [Member]        
Investment Income        
Interest 1,176,354 2,290,280 3,111,177 4,533,047
Expenses        
Management fee 294,244 440,755 775,568 892,340
Brokerage commissions 62,422 43,839 123,198 97,800
Total expenses 356,666 484,594 898,766 990,140
Net investment income (loss) 819,688 1,805,686 2,212,411 3,542,907
Net realized gain (loss) on        
Net realized gain (loss) 32,209,630 (143,424) 41,143,529 (12,652,246)
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) 14,026,830 (1,552,095) 17,511,380 (36,001,228)
Net realized and unrealized gain (loss) 46,236,460 (1,695,519) 58,654,909 (48,653,474)
Net income (loss) 47,056,148 110,167 60,867,320 (45,110,567)
ProShares UltraShort Bloomberg Crude Oil [Member] | Futures Contracts [Member]        
Net realized gain (loss) on        
Net realized gain (loss) 32,210,113 (143,424) 41,144,012 (12,659,025)
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) 14,026,553 (1,560,618) 17,511,380 (35,992,048)
ProShares UltraShort Bloomberg Crude Oil [Member] | Short-term U.S. Government and Agency Obligations [Member]        
Net realized gain (loss) on        
Net realized gain (loss) (483) 0 (483) 6,779
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) 277 8,523 0 (9,180)
ProShares UltraShort Bloomberg Natural Gas [Member]        
Investment Income        
Interest 3,919,799 1,577,496 8,363,249 2,924,574
Expenses        
Management fee 972,550 310,060 2,059,769 572,504
Brokerage commissions 525,062 304,998 1,029,562 566,252
Futures account fees 26,697 10,978 72,737 27,011
Total expenses 1,524,309 626,036 3,162,068 1,165,767
Net investment income (loss) 2,395,490 951,460 5,201,181 1,758,807
Net realized gain (loss) on        
Net realized gain (loss) 124,592,646 (44,563,292) (97,235,066) 89,322
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) 80,955,495 20,550,559 66,357,458 44,377,047
Net realized and unrealized gain (loss) 205,548,141 (24,012,733) (30,877,608) 44,466,369
Net income (loss) 207,943,631 (23,061,273) (25,676,427) 46,225,176
ProShares UltraShort Bloomberg Natural Gas [Member] | Futures Contracts [Member]        
Net realized gain (loss) on        
Net realized gain (loss) 124,600,984 (44,563,292) (97,226,728) 91,065
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) 80,953,188 20,547,016 66,356,953 44,377,650
ProShares UltraShort Bloomberg Natural Gas [Member] | Short-term U.S. Government and Agency Obligations [Member]        
Net realized gain (loss) on        
Net realized gain (loss) (8,338) 0 (8,338) (1,743)
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) 2,307 3,543 505 (603)
ProShares UltraShort Euro [Member]        
Investment Income        
Interest 303,400 429,872 651,455 888,189
Expenses        
Management fee 79,062 90,978 169,010 186,228
Total expenses 79,062 90,978 169,010 186,228
Net investment income (loss) 224,338 338,894 482,445 701,961
Net realized gain (loss) on        
Net realized gain (loss) (3,936,874) 900,760 (5,567,827) (38,460)
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) (1,538,631) (199,005) (2,883,349) 2,768,728
Net realized and unrealized gain (loss) (5,475,505) 701,755 (8,451,176) 2,730,268
Net income (loss) (5,251,167) 1,040,649 (7,968,731) 3,432,229
ProShares UltraShort Euro [Member] | Foreign Currency Forward Contracts [Member]        
Net realized gain (loss) on        
Net realized gain (loss) (3,936,993) 900,760 (5,567,946) (43,101)
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) (1,538,631) (199,005) (2,883,349) 2,768,728
ProShares UltraShort Euro [Member] | Short-term U.S. Government and Agency Obligations [Member]        
Net realized gain (loss) on        
Net realized gain (loss) 119 0 119 4,641
ProShares UltraShort Gold [Member]        
Investment Income        
Interest 712,768 176,727 925,475 319,930
Expenses        
Management fee 198,669 39,309 256,449 71,710
Brokerage commissions 9,743 1,283 11,822 2,218
Total expenses 208,412 40,592 268,271 73,928
Net investment income (loss) 504,356 136,135 657,204 246,002
Net realized gain (loss) on        
Net realized gain (loss) 5,846,099 (2,516,474) 2,403,495 (3,914,287)
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) 5,933,528 1,264,436 1,607,812 919,857
Net realized and unrealized gain (loss) 11,779,627 (1,252,038) 4,011,307 (2,994,430)
Net income (loss) 12,283,983 (1,115,903) 4,668,511 (2,748,428)
ProShares UltraShort Gold [Member] | Futures Contracts [Member]        
Net realized gain (loss) on        
Net realized gain (loss) 5,683,372 (976,285) 4,105,748 (1,626,248)
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) 3,028,045 374,155 341,396 311,336
ProShares UltraShort Gold [Member] | Swap Agreements [Member]        
Net realized gain (loss) on        
Net realized gain (loss) 162,727 (1,540,189) (1,702,253) (2,288,039)
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) 2,905,483 890,281 1,266,416 608,521
ProShares UltraShort Silver [Member]        
Investment Income        
Interest 227,082 597,421 404,937 978,854
Expenses        
Management fee 72,877 139,041 134,248 230,179
Brokerage commissions 5,790 13,863 10,119 19,887
Total expenses 78,667 152,904 144,367 250,066
Net investment income (loss) 148,415 444,517 260,570 728,788
Net realized gain (loss) on        
Net realized gain (loss) (3,327,232) (16,070,138) (6,436,218) (10,290,118)
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) 2,491,447 4,902,824 (2,560,601) 3,484,222
Net realized and unrealized gain (loss) (835,785) (11,167,314) (8,996,819) (6,805,896)
Net income (loss) (687,370) (10,722,797) (8,736,249) (6,077,108)
ProShares UltraShort Silver [Member] | Futures Contracts [Member]        
Net realized gain (loss) on        
Net realized gain (loss) (778,764) (7,210,938) (2,520,178) (2,337,230)
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) 891,816 943,651 105,765 (806,615)
ProShares UltraShort Silver [Member] | Swap Agreements [Member]        
Net realized gain (loss) on        
Net realized gain (loss) (2,548,468) (8,859,200) (3,916,040) (7,952,888)
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) 1,599,631 3,959,173 (2,666,366) 4,290,837
ProShares UltraShort Yen [Member]        
Investment Income        
Interest 208,788 456,243 417,761 771,660
Expenses        
Management fee 53,166 96,949 107,103 163,082
Total expenses 53,166 96,949 107,103 163,082
Net investment income (loss) 155,622 359,294 310,658 608,578
Net realized gain (loss) on        
Net realized gain (loss) (1,138,233) 4,417,569 (1,296,927) 6,126,381
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) (710,709) 1,529,867 (2,515,360) 4,468,019
Net realized and unrealized gain (loss) (1,848,942) 5,947,436 (3,812,287) 10,594,400
Net income (loss) (1,693,320) 6,306,730 (3,501,629) 11,202,978
ProShares UltraShort Yen [Member] | Foreign Currency Forward Contracts [Member]        
Net realized gain (loss) on        
Net realized gain (loss) (1,138,324) 4,417,569 (1,297,018) 6,122,840
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) (710,709) 1,529,867 (2,515,360) 4,468,019
ProShares UltraShort Yen [Member] | Short-term U.S. Government and Agency Obligations [Member]        
Net realized gain (loss) on        
Net realized gain (loss) 91 0 91 3,541
ProShares VIX Mid-Term Futures ETF [Member]        
Investment Income        
Interest 216,994 1,106,849 498,093 1,622,013
Expenses        
Management fee 49,547 191,320 113,521 288,207
Brokerage commissions 5,909 66,049 18,454 86,212
Futures account fees 2,004 10,537 5,124 16,541
Total expenses 57,460 267,906 137,099 390,960
Net investment income (loss) 159,534 838,943 360,994 1,231,053
Net realized gain (loss) on        
Net realized gain (loss) 4,727,074 (8,949,418) 5,434,266 (15,054,609)
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) (1,835,417) 1,095,379 (210,933) 3,885,170
Net realized and unrealized gain (loss) 2,891,657 (7,854,039) 5,223,333 (11,169,439)
Net income (loss) 3,051,191 (7,015,096) 5,584,327 (9,938,386)
ProShares VIX Mid-Term Futures ETF [Member] | Futures Contracts [Member]        
Net realized gain (loss) on        
Net realized gain (loss) 4,726,990 (8,949,418) 5,434,182 (15,057,887)
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) (1,835,417) 1,092,860 (210,933) 3,882,651
ProShares VIX Mid-Term Futures ETF [Member] | Short-term U.S. Government and Agency Obligations [Member]        
Net realized gain (loss) on        
Net realized gain (loss) 84 0 84 3,278
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) 0 2,519 0 2,519
ProShares VIX Short-Term Futures ETF [Member]        
Investment Income        
Interest 1,189,233 1,619,921 2,751,531 3,378,183
Expenses        
Management fee 286,187 310,061 652,682 646,437
Brokerage commissions 117,436 39,404 288,163 79,663
Futures account fees 22,263 31,267 88,661 64,538
Total expenses 425,886 380,732 1,029,506 790,638
Net investment income (loss) 763,347 1,239,189 1,722,025 2,587,545
Net realized gain (loss) on        
Net realized gain (loss) 44,564,970 (27,512,354) 76,774,233 (59,266,488)
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) (21,523,329) 4,022,209 (14,541,848) 6,991,389
Net realized and unrealized gain (loss) 23,041,641 (23,490,145) 62,232,385 (52,275,099)
Net income (loss) 23,804,988 (22,250,956) 63,954,410 (49,687,554)
ProShares VIX Short-Term Futures ETF [Member] | Futures Contracts [Member]        
Net realized gain (loss) on        
Net realized gain (loss) 44,564,343 (27,512,354) 76,773,606 (59,271,318)
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) (21,523,129) 4,018,755 (14,535,040) 7,003,274
ProShares VIX Short-Term Futures ETF [Member] | Short-term U.S. Government and Agency Obligations [Member]        
Net realized gain (loss) on        
Net realized gain (loss) 627 0 627 4,830
Change in net unrealized appreciation (depreciation) on        
Change in net unrealized appreciation (depreciation) $ (200) $ 3,454 $ (6,808) $ (11,885)