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Statements of Operations - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Investment Income      
Interest $ 138,146,117 $ 142,663,792 $ 136,369,286
Expenses      
Management fee 37,349,047 30,596,625 35,112,338
Brokerage commissions 8,156,439 7,879,443 8,606,195
Futures account fees 1,210,166 738,895 1,467,200
Total expenses 46,715,652 39,214,963 45,185,733
Net investment income (loss) 91,430,465 103,448,829 91,183,553
Net realized gain (loss) on      
Net realized gain (loss) 1,036,108,135 (134,354,034) (2,716,520,875)
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) 584,376,924 (8,466,544) 143,926,302
Net realized and unrealized gain (loss) 1,620,485,059 (142,820,578) (2,572,594,573)
Net income (loss) 1,711,915,524 (39,371,749) (2,481,411,020)
Futures Contracts [Member]      
Net realized gain (loss) on      
Net realized gain (loss) 352,443,815 (318,107,709) (2,752,823,603)
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) 245,606,827 21,942,821 241,673,235
Swap Agreements [Member]      
Net realized gain (loss) on      
Net realized gain (loss) 691,914,885 183,559,658 38,451,228
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) 338,106,080 (30,748,143) (100,372,363)
Foreign Currency Forward Contracts [Member]      
Net realized gain (loss) on      
Net realized gain (loss) (8,255,482) 120,896 (1,988,872)
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) 328,919 337,454 2,754,014
Short-term U.S. Government and Agency Obligations [Member]      
Net realized gain (loss) on      
Net realized gain (loss) 4,917 73,121 (159,628)
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) 335,098 1,324 (128,584)
ProShares Short VIX Short-Term Futures ETF [Member]      
Investment Income      
Interest 9,893,892 15,966,194 10,251,068
Expenses      
Management fee 2,660,501 3,421,991 2,500,560
Brokerage commissions 571,296 899,331 543,461
Futures account fees 84,599 44,627 0
Total expenses 3,316,396 4,365,949 3,044,021
Net investment income (loss) 6,577,496 11,600,245 7,207,047
Net realized gain (loss) on      
Net realized gain (loss) 36,989,198 42,054,765 160,494,706
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) 18,711,268 (15,661,228) 1,542,809
Net realized and unrealized gain (loss) 55,700,466 26,393,537 162,037,515
Net income (loss) 62,277,962 37,993,782 169,244,562
ProShares Short VIX Short-Term Futures ETF [Member] | Futures Contracts [Member]      
Net realized gain (loss) on      
Net realized gain (loss) 36,988,593 42,037,096 160,516,553
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) 18,708,348 (15,649,375) 1,548,243
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) 605 17,669 (21,847)
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) 2,920 (11,853) (5,434)
ProShares Ultra Bloomberg Crude Oil [Member]      
Investment Income      
Interest 11,978,374 24,269,178 22,579,489
Expenses      
Management fee 3,783,619 5,484,869 6,801,744
Brokerage commissions 215,212 250,960 317,243
Total expenses 3,998,831 5,735,829 7,118,987
Net investment income (loss) 7,979,543 18,533,349 15,460,502
Net realized gain (loss) on      
Net realized gain (loss) (28,212,710) 47,314,191 100,808,721
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) (63,916,460) 34,625,310 (86,020,999)
Net realized and unrealized gain (loss) (92,129,170) 81,939,501 14,787,722
Net income (loss) (84,149,627) 100,472,850 30,248,224
ProShares Ultra Bloomberg Crude Oil [Member] | Futures Contracts [Member]      
Net realized gain (loss) on      
Net realized gain (loss) 4,616,862 29,612,774 62,486,794
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) (14,553,192) 14,379,317 (29,806,948)
ProShares Ultra Bloomberg Crude Oil [Member] | Swap Agreements [Member]      
Net realized gain (loss) on      
Net realized gain (loss) (32,830,081) 17,688,247 38,380,744
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) (49,366,731) 20,260,675 (56,204,642)
ProShares Ultra Bloomberg Crude Oil [Member] | Short-term U.S. Government and Agency Obligations [Member]      
Net realized gain (loss) on      
Net realized gain (loss) 509 13,170 (58,817)
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) 3,463 (14,682) (9,409)
ProShares Ultra Bloomberg Natural Gas [Member]      
Investment Income      
Interest 13,541,816 25,765,554 34,926,670
Expenses      
Management fee 3,588,538 5,578,019 9,157,296
Brokerage commissions 1,459,746 2,815,764 3,527,713
Futures account fees 205,749 227,465 662,807
Total expenses 5,254,033 8,621,248 13,347,816
Net investment income (loss) 8,287,783 17,144,306 21,578,854
Net realized gain (loss) on      
Net realized gain (loss) 140,707,507 (398,290,574) (2,080,655,811)
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) (229,307,553) 53,645,757 354,183,787
Net realized and unrealized gain (loss) (88,600,046) (344,644,817) (1,726,472,024)
Net income (loss) (80,312,263) (327,500,511) (1,704,893,170)
ProShares Ultra Bloomberg Natural Gas [Member] | Futures Contracts [Member]      
Net realized gain (loss) on      
Net realized gain (loss) 140,707,545 (398,292,227) (2,054,254,551)
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) (229,336,073) 53,632,131 354,221,039
ProShares Ultra Bloomberg Natural Gas [Member] | Swap Agreements [Member]      
Net realized gain (loss) on      
Net realized gain (loss) 0 0 (26,402,152)
ProShares Ultra Bloomberg Natural Gas [Member] | Short-term U.S. Government and Agency Obligations [Member]      
Net realized gain (loss) on      
Net realized gain (loss) (38) 1,653 892
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) 28,520 13,626 (37,252)
ProShares Ultra Euro [Member]      
Investment Income      
Interest 238,995 270,617 343,876
Expenses      
Management fee 63,712 56,629 77,062
Total expenses 63,712 56,629 77,062
Net investment income (loss) 175,283 213,988 266,814
Net realized gain (loss) on      
Net realized gain (loss) 852,316 (576,761) 293,493
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) 229,818 (474,077) (108,707)
Net realized and unrealized gain (loss) 1,082,134 (1,050,838) 184,786
Net income (loss) 1,257,417 (836,850) 451,600
ProShares Ultra Euro [Member] | Foreign Currency Forward Contracts [Member]      
Net realized gain (loss) on      
Net realized gain (loss) 852,316 (576,761) 293,493
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) 229,818 (474,077) (108,707)
ProShares Ultra Gold [Member]      
Investment Income      
Interest 23,331,406 11,701,123 7,285,355
Expenses      
Management fee 5,753,407 2,352,382 1,735,128
Brokerage commissions 92,349 39,518 26,654
Total expenses 5,845,756 2,391,900 1,761,782
Net investment income (loss) 17,485,650 9,309,223 5,523,573
Net realized gain (loss) on      
Net realized gain (loss) 419,725,491 85,341,533 21,400,830
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) 68,830,455 (9,937,400) (2,575,471)
Net realized and unrealized gain (loss) 488,555,946 75,404,133 18,825,359
Net income (loss) 506,041,596 84,713,356 24,348,932
ProShares Ultra Gold [Member] | Futures Contracts [Member]      
Net realized gain (loss) on      
Net realized gain (loss) 223,495,311 25,752,832 849,905
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) 37,721,687 (4,519,683) 854,187
ProShares Ultra Gold [Member] | Swap Agreements [Member]      
Net realized gain (loss) on      
Net realized gain (loss) 196,229,728 59,585,690 20,579,249
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) 31,024,587 (5,426,725) (3,417,873)
ProShares Ultra Gold [Member] | Short-term U.S. Government and Agency Obligations [Member]      
Net realized gain (loss) on      
Net realized gain (loss) 452 3,011 (28,324)
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) 84,181 9,008 (11,785)
ProShares Ultra Silver [Member]      
Investment Income      
Interest 31,030,869 24,945,342 13,905,665
Expenses      
Management fee 8,259,769 5,144,179 3,644,422
Brokerage commissions 223,054 178,278 130,997
Total expenses 8,482,823 5,322,457 3,775,419
Net investment income (loss) 22,548,046 19,622,885 10,130,246
Net realized gain (loss) on      
Net realized gain (loss) 870,715,186 176,632,029 7,175,146
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) 814,747,030 (90,982,802) (59,096,598)
Net realized and unrealized gain (loss) 1,685,462,216 85,649,227 (51,921,452)
Net income (loss) 1,708,010,262 105,272,112 (41,791,206)
ProShares Ultra Silver [Member] | Futures Contracts [Member]      
Net realized gain (loss) on      
Net realized gain (loss) 300,868,418 60,089,642 (223,436)
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) 448,148,934 (41,304,283) (17,025,826)
ProShares Ultra Silver [Member] | Swap Agreements [Member]      
Net realized gain (loss) on      
Net realized gain (loss) 569,846,413 116,537,615 7,445,439
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) 366,432,166 (49,691,687) (42,051,433)
ProShares Ultra Silver [Member] | Short-term U.S. Government and Agency Obligations [Member]      
Net realized gain (loss) on      
Net realized gain (loss) 355 4,772 (46,857)
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) 165,930 13,168 (19,339)
ProShares Ultra VIX Short-Term Futures ETF [Member]      
Investment Income      
Interest 14,858,287 10,412,156 15,951,926
Expenses      
Management fee 4,692,200 2,534,346 4,392,607
Brokerage commissions 3,369,419 2,159,377 2,596,882
Futures account fees 600,883 279,647 476,293
Total expenses 8,662,502 4,973,370 7,465,782
Net investment income (loss) 6,195,785 5,438,786 8,486,144
Net realized gain (loss) on      
Net realized gain (loss) (366,306,992) (136,416,002) (940,103,052)
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) (70,035,993) 45,166,711 5,368,159
Net realized and unrealized gain (loss) (436,342,985) (91,249,291) (934,734,893)
Net income (loss) (430,147,200) (85,810,505) (926,248,749)
ProShares Ultra VIX Short-Term Futures ETF [Member] | Futures Contracts [Member]      
Net realized gain (loss) on      
Net realized gain (loss) (366,312,175) (136,430,513) (940,116,773)
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) (70,051,154) 45,159,903 5,371,542
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) 5,183 14,511 13,721
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) 15,161 6,808 (3,383)
ProShares Ultra Yen [Member]      
Investment Income      
Interest 2,040,523 1,853,973 667,026
Expenses      
Management fee 543,420 405,325 145,536
Total expenses 543,420 405,325 145,536
Net investment income (loss) 1,497,103 1,448,648 521,490
Net realized gain (loss) on      
Net realized gain (loss) (6,455,940) (6,562,004) (2,637,502)
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) 3,032,649 (5,734,582) 534,736
Net realized and unrealized gain (loss) (3,423,291) (12,296,586) (2,102,766)
Net income (loss) (1,926,188) (10,847,938) (1,581,276)
ProShares Ultra Yen [Member] | Foreign Currency Forward Contracts [Member]      
Net realized gain (loss) on      
Net realized gain (loss) (6,455,940) (6,562,004) (2,637,502)
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) 3,032,649 (5,734,582) 534,736
ProShares UltraShort Bloomberg Crude Oil [Member]      
Investment Income      
Interest 5,201,591 7,561,479 8,581,404
Expenses      
Management fee 1,317,020 1,518,281 1,871,453
Brokerage commissions 208,797 183,413 242,865
Total expenses 1,525,817 1,701,694 2,114,318
Net investment income (loss) 3,675,774 5,859,785 6,467,086
Net realized gain (loss) on      
Net realized gain (loss) 59,511,109 4,436,570 12,367,670
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) 13,688,036 (24,101,673) 12,181,761
Net realized and unrealized gain (loss) 73,199,145 (19,665,103) 24,549,431
Net income (loss) 76,874,919 (13,805,318) 31,016,517
ProShares UltraShort Bloomberg Crude Oil [Member] | Futures Contracts [Member]      
Net realized gain (loss) on      
Net realized gain (loss) 59,511,592 4,429,612 12,379,340
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) 13,680,510 (24,091,711) 12,191,426
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) 6,958 (11,670)
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) 7,526 (9,962) (9,665)
ProShares UltraShort Bloomberg Natural Gas [Member]      
Investment Income      
Interest 11,784,270 5,342,982 5,542,278
Expenses      
Management fee 2,956,356 1,092,378 1,226,758
Brokerage commissions 1,390,324 965,275 817,632
Futures account fees 96,640 40,687 104,966
Total expenses 4,443,320 2,098,340 2,149,356
Net investment income (loss) 7,340,950 3,244,642 3,392,922
Net realized gain (loss) on      
Net realized gain (loss) 41,448,849 96,486,398 306,795,581
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) 80,087,267 (22,576,997) (89,455,705)
Net realized and unrealized gain (loss) 121,536,116 73,909,401 217,339,876
Net income (loss) 128,877,066 77,154,043 220,732,798
ProShares UltraShort Bloomberg Natural Gas [Member] | Futures Contracts [Member]      
Net realized gain (loss) on      
Net realized gain (loss) 41,451,537 96,490,359 306,791,742
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) 80,074,041 (22,576,997) (89,442,905)
ProShares UltraShort Bloomberg Natural Gas [Member] | Short-term U.S. Government and Agency Obligations [Member]      
Net realized gain (loss) on      
Net realized gain (loss) (2,688) (3,961) 3,839
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) 13,226 0 (12,800)
ProShares UltraShort Euro [Member]      
Investment Income      
Interest 1,256,855 1,650,526 2,251,539
Expenses      
Management fee 336,251 360,078 505,085
Total expenses 336,251 360,078 505,085
Net investment income (loss) 920,604 1,290,448 1,746,454
Net realized gain (loss) on      
Net realized gain (loss) (6,435,931) 2,514,606 (2,624,737)
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) (1,549,424) 3,005,829 607,675
Net realized and unrealized gain (loss) (7,985,355) 5,520,435 (2,017,062)
Net income (loss) (7,064,751) 6,810,883 (270,608)
ProShares UltraShort Euro [Member] | Foreign Currency Forward Contracts [Member]      
Net realized gain (loss) on      
Net realized gain (loss) (6,436,050) 2,509,965 (2,624,737)
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) (1,549,424) 3,005,829 612,477
ProShares UltraShort Euro [Member] | Short-term U.S. Government and Agency Obligations [Member]      
Net realized gain (loss) on      
Net realized gain (loss) 119 4,641 0
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) 0 0 (4,802)
ProShares UltraShort Gold [Member]      
Investment Income      
Interest 2,177,430 668,180 582,222
Expenses      
Management fee 621,338 155,523 140,787
Brokerage commissions 20,223 5,075 4,880
Total expenses 641,561 160,598 145,667
Net investment income (loss) 1,535,869 507,582 436,555
Net realized gain (loss) on      
Net realized gain (loss) (24,038,943) (6,246,384) (2,180,686)
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) (3,685,880) 606,689 347,791
Net realized and unrealized gain (loss) (27,724,823) (5,639,695) (1,832,895)
Net income (loss) (26,188,954) (5,132,113) (1,396,340)
ProShares UltraShort Gold [Member] | Futures Contracts [Member]      
Net realized gain (loss) on      
Net realized gain (loss) (4,732,954) (2,387,758) (201,345)
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) (976,103) 265,287 (45,345)
ProShares UltraShort Gold [Member] | Swap Agreements [Member]      
Net realized gain (loss) on      
Net realized gain (loss) (19,305,989) (3,858,626) (1,979,341)
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) (2,709,777) 341,402 393,136
ProShares UltraShort Silver [Member]      
Investment Income      
Interest 1,056,505 1,836,045 1,118,150
Expenses      
Management fee 358,757 443,177 287,739
Brokerage commissions 21,879 38,489 39,452
Total expenses 380,636 481,666 327,191
Net investment income (loss) 675,869 1,354,379 790,959
Net realized gain (loss) on      
Net realized gain (loss) (42,610,029) (8,286,334) 13,437,583
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) (17,064,931) 2,591,061 3,537,995
Net realized and unrealized gain (loss) (59,674,960) (5,695,273) 16,975,578
Net income (loss) (58,999,091) (4,340,894) 17,766,537
ProShares UltraShort Silver [Member] | Futures Contracts [Member]      
Net realized gain (loss) on      
Net realized gain (loss) (20,584,843) (1,893,066) 13,011,200
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) (9,790,766) (1,177,131) 2,629,546
ProShares UltraShort Silver [Member] | Swap Agreements [Member]      
Net realized gain (loss) on      
Net realized gain (loss) (22,025,186) (6,393,268) 427,289
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) (7,274,165) 3,768,192 908,449
ProShares UltraShort Silver [Member] | Short-term U.S. Government and Agency Obligations [Member]      
Net realized gain (loss) on      
Net realized gain (loss) 0 0 (906)
ProShares UltraShort Yen [Member]      
Investment Income      
Interest 965,246 1,493,002 1,052,461
Expenses      
Management fee 258,166 324,236 233,492
Total expenses 258,166 324,236 233,492
Net investment income (loss) 707,080 1,168,766 818,969
Net realized gain (loss) on      
Net realized gain (loss) 3,784,283 4,753,237 2,979,874
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) (1,384,124) 3,540,284 1,712,747
Net realized and unrealized gain (loss) 2,400,159 8,293,521 4,692,621
Net income (loss) 3,107,239 9,462,287 5,511,590
ProShares UltraShort Yen [Member] | Foreign Currency Forward Contracts [Member]      
Net realized gain (loss) on      
Net realized gain (loss) 3,784,192 4,749,696 2,979,874
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) (1,384,124) 3,540,284 1,715,508
ProShares UltraShort Yen [Member] | Short-term U.S. Government and Agency Obligations [Member]      
Net realized gain (loss) on      
Net realized gain (loss) 91 3,541 0
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) 0 0 (2,761)
ProShares VIX Mid-Term Futures ETF [Member]      
Investment Income      
Interest 1,197,467 2,348,655 2,412,485
Expenses      
Management fee 284,981 428,613 499,363
Brokerage commissions 34,343 99,142 40,128
Futures account fees 15,257 25,768 40,387
Total expenses 334,581 553,523 579,878
Net investment income (loss) 862,886 1,795,132 1,832,607
Net realized gain (loss) on      
Net realized gain (loss) 2,901,125 (13,692,881) (38,709,532)
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) (2,057,815) 3,767,942 1,039,896
Net realized and unrealized gain (loss) 843,310 (9,924,939) (37,669,636)
Net income (loss) 1,706,196 (8,129,807) (35,837,029)
ProShares VIX Mid-Term Futures ETF [Member] | Futures Contracts [Member]      
Net realized gain (loss) on      
Net realized gain (loss) 2,901,041 (13,696,430) (38,709,532)
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) (2,057,815) 3,767,942 1,045,547
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 3,549 0
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) 0 0 (5,651)
ProShares VIX Short-Term Futures ETF [Member]      
Investment Income      
Interest 7,592,591 6,578,786 8,917,672
Expenses      
Management fee 1,871,012 1,296,599 1,893,306
Brokerage commissions 549,797 244,821 318,288
Futures account fees 207,038 120,701 182,747
Total expenses 2,627,847 1,662,121 2,394,341
Net investment income (loss) 4,964,744 4,916,665 6,523,331
Net realized gain (loss) on      
Net realized gain (loss) (66,466,384) (23,816,423) (275,363,159)
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) (25,947,419) 14,052,632 126,426
Net realized and unrealized gain (loss) (92,413,803) (9,763,791) (275,236,733)
Net income (loss) (87,449,059) (4,847,126) (268,713,402)
ProShares VIX Short-Term Futures ETF [Member] | Futures Contracts [Member]      
Net realized gain (loss) on      
Net realized gain (loss) (66,467,112) (23,820,030) (275,353,500)
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) (25,961,590) 14,057,421 132,729
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) 728 3,607 (9,659)
Change in net unrealized appreciation (depreciation) on      
Change in net unrealized appreciation (depreciation) $ 14,171 $ (4,789) $ (6,303)