v3.10.0.1
Statements of Cash Flows - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2017
Cash flow from operating activities        
Net income (loss)   $ (1,390,119,446)   $ (636,068,262) [1]
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:        
Purchases of short-term U.S. government and agency obligations   (48,849,204,384)   (10,660,500,706) [1]
Proceeds from sales or maturities of short-term U.S government and agency obligations   50,007,465,069   10,508,946,861 [1]
Net amortization and accretion on short-term U.S government and agency obligations   (12,882,840)   (9,188,022) [1]
Net realized gain (loss) on investments   271,404   48,632 [1]
Change in unrealized appreciation/depreciation on investments   13,710,803   135,595,533 [1]
Decrease (Increase) in receivable on futures contracts   (77,942,123)   (22,251,274) [1]
Decrease (Increase) in Limitation by Sponsor   59,651   (30,418) [1]
Decrease (Increase) in interest receivable   344,890    
Amortization of offering cost $ 73,998 105,643   79,690 [1]
Increase (Decrease) in payable to Sponsor   (589,486)   (291,239) [1]
Increase (Decrease) in brokerage commissions and fees payable [1]       (2,909)
Increase (Decrease) in payable on futures contracts   15,168,788   1,162,863 [1]
Increase (Decrease) in payable to Broker   19,297    
Net cash provided by (used in) operating activities   (294,282,514)   (682,499,251) [1]
Cash flow from financing activities        
Proceeds from addition of shares   4,165,181,831   4,648,321,002 [1]
Payment on shares redeemed   (3,381,451,304)   (3,930,984,642) [1]
Net cash provided by (used in) financing activities   783,730,527   717,336,360 [1]
Net increase (decrease) in cash   489,448,013   34,837,109 [1]
Cash, beginning of period   483,772,745   219,695,457 [1]
Cash, end of period 254,532,566 [1] 973,220,758 $ 254,532,566 [1] 254,532,566 [1]
ProShares Short Euro [Member]        
Cash flow from operating activities        
Net income (loss)   327,449   (1,087,462)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:        
Purchases of short-term U.S. government and agency obligations   (203,046,070)   (39,955,220)
Proceeds from sales or maturities of short-term U.S government and agency obligations   204,400,000   44,164,518
Net amortization and accretion on short-term U.S government and agency obligations   (43,878)   (38,480)
Net realized gain (loss) on investments       277
Change in unrealized appreciation/depreciation on investments   (881)   (78)
Decrease (Increase) in receivable on futures contracts       (11,406)
Decrease (Increase) in interest receivable   1,675    
Increase (Decrease) in payable to Sponsor   (48)   (2,913)
Increase (Decrease) in payable on futures contracts   36,180   (76,666)
Net cash provided by (used in) operating activities   1,671,077   2,992,570
Cash flow from financing activities        
Payment on shares redeemed       (4,248,634)
Net cash provided by (used in) financing activities       (4,248,634)
Net increase (decrease) in cash   1,671,077   (1,256,064)
Cash, beginning of period   1,045,493   2,694,612
Cash, end of period 1,438,548 2,716,570 1,438,548 1,438,548
ProShares Short VIX Short-Term Futures ETF [Member]        
Cash flow from operating activities        
Net income (loss)   (1,869,690,201)   285,062,971
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:        
Purchases of short-term U.S. government and agency obligations   (12,775,402,055)   (1,954,981,505)
Proceeds from sales or maturities of short-term U.S government and agency obligations   13,179,156,026   1,466,529,786
Net amortization and accretion on short-term U.S government and agency obligations   (2,046,569)   (1,382,694)
Net realized gain (loss) on investments   259,112   11,258
Change in unrealized appreciation/depreciation on investments   (51,865)   1,151
Decrease (Increase) in receivable on futures contracts   (86,552,497)   (18,820,532)
Decrease (Increase) in interest receivable   91,825    
Increase (Decrease) in payable to Sponsor   (382,448)   298,009
Increase (Decrease) in payable on futures contracts   (528,750)   (325,000)
Increase (Decrease) in payable to Broker   19,297    
Net cash provided by (used in) operating activities   (1,555,311,775)   (223,606,556)
Cash flow from financing activities        
Proceeds from addition of shares   2,359,283,234   1,908,009,880
Payment on shares redeemed   (776,335,847)   (1,636,947,258)
Net cash provided by (used in) financing activities   1,582,947,387   271,062,622
Net increase (decrease) in cash   27,635,612   47,456,066
Cash, beginning of period   300,668,276   57,174,744
Cash, end of period 104,630,810 328,303,888 104,630,810 104,630,810
ProShares Ultra Bloomberg Crude Oil [Member]        
Cash flow from operating activities        
Net income (loss)   178,310,934   (289,554,809)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:        
Purchases of short-term U.S. government and agency obligations   (8,163,708,567)   (2,966,410,064)
Proceeds from sales or maturities of short-term U.S government and agency obligations   8,260,299,661   2,843,055,679
Net amortization and accretion on short-term U.S government and agency obligations   (2,977,358)   (2,617,079)
Net realized gain (loss) on investments   6   6,249
Change in unrealized appreciation/depreciation on investments   (20,243,977)   114,084,748
Decrease (Increase) in receivable on futures contracts   894,293   (9,209,410)
Decrease (Increase) in interest receivable   38,701    
Increase (Decrease) in payable to Sponsor   (76,600)   (147,423)
Increase (Decrease) in brokerage commissions and fees payable       (2,332)
Increase (Decrease) in payable on futures contracts       (1,993,438)
Net cash provided by (used in) operating activities   252,459,691   (312,787,879)
Cash flow from financing activities        
Proceeds from addition of shares   117,036,583   1,039,652,714
Payment on shares redeemed   (343,460,089)   (719,602,834)
Net cash provided by (used in) financing activities   (226,423,506)   320,049,880
Net increase (decrease) in cash   26,036,185   7,262,001
Cash, beginning of period   10,329,503   22,011,155
Cash, end of period 29,273,156 36,365,688 29,273,156 29,273,156
ProShares Ultra Bloomberg Natural Gas [Member]        
Cash flow from operating activities        
Net income (loss)   (2,230,247)   (21,604,919)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:        
Purchases of short-term U.S. government and agency obligations   (1,227,372,111)   (127,836,007)
Proceeds from sales or maturities of short-term U.S government and agency obligations   1,260,597,907   126,186,419
Net amortization and accretion on short-term U.S government and agency obligations   (220,680)   (106,835)
Net realized gain (loss) on investments   31   672
Change in unrealized appreciation/depreciation on investments   (4,217)   408
Decrease (Increase) in receivable on futures contracts   1,520,156    
Decrease (Increase) in interest receivable   6,310    
Increase (Decrease) in payable to Sponsor   (22,765)   (4,427)
Increase (Decrease) in brokerage commissions and fees payable       (433)
Increase (Decrease) in payable on futures contracts   312,516   (1,366,289)
Net cash provided by (used in) operating activities   32,574,280   (24,731,411)
Cash flow from financing activities        
Proceeds from addition of shares   21,882,807   44,413,082
Payment on shares redeemed   (61,091,266)   (22,124,935)
Net cash provided by (used in) financing activities   (39,208,459)   22,288,147
Net increase (decrease) in cash   (6,634,179)   (2,443,264)
Cash, beginning of period   14,716,897   8,584,212
Cash, end of period 6,140,948 8,082,718 6,140,948 6,140,948
ProShares Ultra Euro [Member]        
Cash flow from operating activities        
Net income (loss)   (740,327)   2,266,320
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:        
Purchases of short-term U.S. government and agency obligations   (284,242,967)   (26,852,756)
Proceeds from sales or maturities of short-term U.S government and agency obligations   287,999,612   26,788,597
Net amortization and accretion on short-term U.S government and agency obligations   (48,875)   (39,752)
Net realized gain (loss) on investments   (7)   (147)
Change in unrealized appreciation/depreciation on investments   435,638   (884,459)
Decrease (Increase) in interest receivable   561    
Increase (Decrease) in payable to Sponsor   (463)   434
Net cash provided by (used in) operating activities   3,402,050   1,278,237
Cash flow from financing activities        
Proceeds from addition of shares   2,653,492   10,734,541
Payment on shares redeemed   (2,656,085)   (11,987,367)
Net cash provided by (used in) financing activities   (2,593)   (1,252,826)
Net increase (decrease) in cash   3,399,457   25,411
Cash, beginning of period   2,338,427   606,393
Cash, end of period 631,804 5,737,884 631,804 631,804
ProShares Ultra Gold [Member]        
Cash flow from operating activities        
Net income (loss)   (7,601,273)   14,292,124
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:        
Purchases of short-term U.S. government and agency obligations   (2,169,347,840)   (248,693,041)
Proceeds from sales or maturities of short-term U.S government and agency obligations   2,171,098,513   248,394,829
Net amortization and accretion on short-term U.S government and agency obligations   (704,856)   (300,116)
Net realized gain (loss) on investments   172   (548)
Change in unrealized appreciation/depreciation on investments   10,790,716   3,462,564
Decrease (Increase) in receivable on futures contracts   1,720    
Increase (Decrease) in payable to Sponsor   (1,582)   463
Increase (Decrease) in payable on futures contracts       80
Net cash provided by (used in) operating activities   4,235,570   17,156,355
Cash flow from financing activities        
Proceeds from addition of shares   12,216,052   12,476,159
Payment on shares redeemed   (16,210,941)   (30,177,649)
Net cash provided by (used in) financing activities   (3,994,889)   (17,701,490)
Net increase (decrease) in cash   240,681   (545,135)
Cash, beginning of period   1,245,903   1,275,551
Cash, end of period 730,416 1,486,584 730,416 730,416
ProShares Ultra Silver [Member]        
Cash flow from operating activities        
Net income (loss)   (28,083,669)   4,390,162
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:        
Purchases of short-term U.S. government and agency obligations   (3,679,886,868)   (969,953,635)
Proceeds from sales or maturities of short-term U.S government and agency obligations   3,704,696,262   985,364,623
Net amortization and accretion on short-term U.S government and agency obligations   (1,701,941)   (884,146)
Net realized gain (loss) on investments   372   (198)
Change in unrealized appreciation/depreciation on investments   35,849,052   14,423,106
Decrease (Increase) in receivable on futures contracts   650    
Increase (Decrease) in payable to Sponsor   (11,099)   (14,159)
Increase (Decrease) in payable on futures contracts       (2,020)
Net cash provided by (used in) operating activities   30,862,759   33,323,733
Cash flow from financing activities        
Proceeds from addition of shares   15,385,625   22,323,954
Payment on shares redeemed   (40,418,365)   (56,695,492)
Net cash provided by (used in) financing activities   (25,032,740)   (34,371,538)
Net increase (decrease) in cash   5,830,019   (1,047,805)
Cash, beginning of period   4,466,934   1,678,901
Cash, end of period 631,096 10,296,953 631,096 631,096
ProShares Ultra VIX Short-Term Futures ETF [Member]        
Cash flow from operating activities        
Net income (loss)   333,176,097   (520,329,372)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:        
Purchases of short-term U.S. government and agency obligations   (5,924,241,418)   (1,436,930,485)
Proceeds from sales or maturities of short-term U.S government and agency obligations   6,169,565,730   1,516,392,324
Net amortization and accretion on short-term U.S government and agency obligations   (783,794)   (966,554)
Net realized gain (loss) on investments   7,731   20,751
Change in unrealized appreciation/depreciation on investments   (277,745)   (12,516)
Decrease (Increase) in receivable on futures contracts   6,186,505   7,027,550
Decrease (Increase) in interest receivable   79,464    
Increase (Decrease) in payable to Sponsor   14,779   (101,746)
Increase (Decrease) in payable on futures contracts   10,736,763   2,445,960
Net cash provided by (used in) operating activities   594,305,184   (432,454,088)
Cash flow from financing activities        
Proceeds from addition of shares   1,200,094,023   1,114,068,155
Payment on shares redeemed   (1,556,686,415)   (722,177,029)
Net cash provided by (used in) financing activities   (356,592,392)   391,891,126
Net increase (decrease) in cash   237,712,792   (40,562,962)
Cash, beginning of period   88,750,920   82,333,580
Cash, end of period 41,770,618 326,463,712 41,770,618 41,770,618
ProShares Ultra Yen [Member]        
Cash flow from operating activities        
Net income (loss)   28,199   325,446
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:        
Purchases of short-term U.S. government and agency obligations   (9,291,238)   (8,989,185)
Proceeds from sales or maturities of short-term U.S government and agency obligations   10,300,000   10,284,783
Net amortization and accretion on short-term U.S government and agency obligations   (8,529)   (11,186)
Net realized gain (loss) on investments       32
Change in unrealized appreciation/depreciation on investments   (10,949)   322
Decrease (Increase) in interest receivable   207    
Increase (Decrease) in payable to Sponsor   (19)   193
Net cash provided by (used in) operating activities   1,017,257   1,610,405
Cash flow from financing activities        
Net increase (decrease) in cash   1,017,257   1,610,405
Cash, beginning of period   903,472   604,691
Cash, end of period 2,215,096 1,920,729 2,215,096 2,215,096
ProShares UltraPro 3x Crude Oil ETF [Member]        
Cash flow from operating activities        
Net income (loss)   11,753,196 (1,298,199)  
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:        
Decrease (Increase) in receivable on futures contracts   (311,258) (1,217,969)  
Decrease (Increase) in Limitation by Sponsor   24,342 (8,302)  
Amortization of offering cost 36,999 52,846 39,845  
Increase (Decrease) in payable to Sponsor   23,651    
Net cash provided by (used in) operating activities   11,542,777 (2,484,625)  
Cash flow from financing activities        
Proceeds from addition of shares   29,844,757 24,649,481  
Payment on shares redeemed   (12,124,325) (2,851,396)  
Net cash provided by (used in) financing activities   17,720,432 21,798,085  
Net increase (decrease) in cash   29,263,209 19,313,460  
Cash, beginning of period   10,968,900    
Cash, end of period 19,313,460 40,232,109 19,313,460 19,313,460
ProShares UltraPro 3X Short Crude Oil ETF [Member]        
Cash flow from operating activities        
Net income (loss)   (14,056,083) 1,501,439  
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:        
Decrease (Increase) in Limitation by Sponsor   35,309 (22,116)  
Amortization of offering cost 36,999 52,797 39,845  
Increase (Decrease) in payable to Sponsor   16,649    
Increase (Decrease) in payable on futures contracts   380,105 376,001  
Net cash provided by (used in) operating activities   (13,571,223) 1,895,169  
Cash flow from financing activities        
Proceeds from addition of shares   35,989,061 8,281,419  
Payment on shares redeemed   (23,302,804) (4,490,543)  
Net cash provided by (used in) financing activities   12,686,257 3,790,876  
Net increase (decrease) in cash   (884,966) 5,686,045  
Cash, beginning of period   21,600,168    
Cash, end of period 5,686,045 20,715,202 5,686,045 5,686,045
ProShares UltraShort Australian Dollar [Member]        
Cash flow from operating activities        
Net income (loss)   586,295   (2,146,054)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:        
Purchases of short-term U.S. government and agency obligations   (150,158,646)   (48,960,668)
Proceeds from sales or maturities of short-term U.S government and agency obligations   157,198,666   51,910,220
Net amortization and accretion on short-term U.S government and agency obligations   (43,404)   (35,524)
Net realized gain (loss) on investments   247   155
Change in unrealized appreciation/depreciation on investments   (1,288)   (857)
Decrease (Increase) in interest receivable   221    
Increase (Decrease) in payable to Sponsor   (5,481)   (2,395)
Increase (Decrease) in payable on futures contracts   44,169   (16,740)
Net cash provided by (used in) operating activities   7,620,337   748,137
Cash flow from financing activities        
Payment on shares redeemed   (6,710,633)   (2,492,445)
Net cash provided by (used in) financing activities   (6,710,633)   (2,492,445)
Net increase (decrease) in cash   909,704   (1,744,308)
Cash, beginning of period   1,782,397   3,749,149
Cash, end of period 2,004,841 2,692,101 2,004,841 2,004,841
ProShares UltraShort Bloomberg Crude Oil [Member]        
Cash flow from operating activities        
Net income (loss)   (81,557,643)   83,861,944
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:        
Purchases of short-term U.S. government and agency obligations   (4,309,513,192)   (538,411,241)
Proceeds from sales or maturities of short-term U.S government and agency obligations   4,390,983,509   642,706,972
Net amortization and accretion on short-term U.S government and agency obligations   (1,446,300)   (539,542)
Net realized gain (loss) on investments   (358)   1,483
Change in unrealized appreciation/depreciation on investments   3,132,009   (24,463,132)
Decrease (Increase) in interest receivable   35,781    
Increase (Decrease) in payable to Sponsor   (58,799)   (52,894)
Increase (Decrease) in payable on futures contracts   239,933   1,509,485
Net cash provided by (used in) operating activities   1,743,378   164,613,075
Cash flow from financing activities        
Proceeds from addition of shares   160,958,045   192,713,160
Payment on shares redeemed   (132,957,261)   (360,702,384)
Net cash provided by (used in) financing activities   28,000,784   (167,989,224)
Net increase (decrease) in cash   29,744,162   (3,376,149)
Cash, beginning of period   3,688,091   7,647,292
Cash, end of period 4,271,143 33,432,253 4,271,143 4,271,143
ProShares UltraShort Bloomberg Natural Gas [Member]        
Cash flow from operating activities        
Net income (loss)   1,078,846   2,091,431
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:        
Purchases of short-term U.S. government and agency obligations   (378,766,326)   (13,982,114)
Proceeds from sales or maturities of short-term U.S government and agency obligations   378,700,000   13,899,138
Net amortization and accretion on short-term U.S government and agency obligations   (26,936)   (14,473)
Net realized gain (loss) on investments       259
Change in unrealized appreciation/depreciation on investments   (189)   306
Decrease (Increase) in receivable on futures contracts   (70,049)   82,644
Decrease (Increase) in interest receivable   629    
Increase (Decrease) in payable to Sponsor   1,721   2,075
Increase (Decrease) in brokerage commissions and fees payable       (144)
Increase (Decrease) in payable on futures contracts   (104,104)    
Net cash provided by (used in) operating activities   812,334   2,079,122
Cash flow from financing activities        
Proceeds from addition of shares   13,141,010   4,625,005
Payment on shares redeemed   (14,375,750)   (3,299,263)
Net cash provided by (used in) financing activities   (1,234,740)   1,325,742
Net increase (decrease) in cash   (422,406)   3,404,864
Cash, beginning of period   3,010,206   1,037,286
Cash, end of period 4,442,150 2,587,800 4,442,150 4,442,150
ProShares UltraShort Euro [Member]        
Cash flow from operating activities        
Net income (loss)   14,273,913   (43,679,165)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:        
Purchases of short-term U.S. government and agency obligations   (2,811,305,567)   (907,040,479)
Proceeds from sales or maturities of short-term U.S government and agency obligations   2,875,785,199   1,002,483,715
Net amortization and accretion on short-term U.S government and agency obligations   (1,334,784)   (893,083)
Net realized gain (loss) on investments   228   2,462
Change in unrealized appreciation/depreciation on investments   (9,772,114)   22,363,154
Decrease (Increase) in interest receivable   37,642    
Increase (Decrease) in payable to Sponsor   (23,307)   (95,869)
Net cash provided by (used in) operating activities   67,585,926   73,140,735
Cash flow from financing activities        
Proceeds from addition of shares   20,753,604   11,821,984
Payment on shares redeemed   (59,841,453)   (87,294,035)
Net cash provided by (used in) financing activities   (39,087,849)   (75,472,051)
Net increase (decrease) in cash   28,498,077   (2,331,316)
Cash, beginning of period   4,293,895   2,916,502
Cash, end of period 585,186 32,791,972 585,186 585,186
ProShares UltraShort Gold [Member]        
Cash flow from operating activities        
Net income (loss)   2,162,840   (8,761,232)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:        
Purchases of short-term U.S. government and agency obligations   (879,165,918)   (98,854,629)
Proceeds from sales or maturities of short-term U.S government and agency obligations   888,398,356   124,561,735
Net amortization and accretion on short-term U.S government and agency obligations   (205,092)   (116,331)
Net realized gain (loss) on investments   (152)   1,072
Change in unrealized appreciation/depreciation on investments   (3,768,897)   378,322
Decrease (Increase) in receivable on futures contracts       580
Increase (Decrease) in payable to Sponsor   (3,228)   (28,295)
Increase (Decrease) in payable on futures contracts   (1,720)    
Net cash provided by (used in) operating activities   7,416,189   17,181,222
Cash flow from financing activities        
Proceeds from addition of shares   16,527,151   18,960,067
Payment on shares redeemed   (23,939,400)   (35,933,119)
Net cash provided by (used in) financing activities   (7,412,249)   (16,973,052)
Net increase (decrease) in cash   3,940   208,170
Cash, beginning of period   1,035,445   134,040
Cash, end of period 342,210 1,039,385 342,210 342,210
ProShares UltraShort Silver [Member]        
Cash flow from operating activities        
Net income (loss)   1,964,714   (1,124,710)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:        
Purchases of short-term U.S. government and agency obligations   (457,648,458)   (62,933,625)
Proceeds from sales or maturities of short-term U.S government and agency obligations   456,171,519   69,554,048
Net amortization and accretion on short-term U.S government and agency obligations   (143,385)   (58,886)
Net realized gain (loss) on investments   2,032   144
Change in unrealized appreciation/depreciation on investments   (3,173,220)   (1,164,441)
Decrease (Increase) in receivable on futures contracts       2,020
Increase (Decrease) in payable to Sponsor   (724)   (2,606)
Increase (Decrease) in payable on futures contracts   (650)    
Net cash provided by (used in) operating activities   (2,828,172)   4,271,944
Cash flow from financing activities        
Proceeds from addition of shares   21,143,589   16,158,593
Payment on shares redeemed   (17,893,559)   (14,875,990)
Net cash provided by (used in) financing activities   3,250,030   1,282,603
Net increase (decrease) in cash   421,858   5,554,547
Cash, beginning of period   1,363,644   100,351
Cash, end of period 5,654,898 1,785,502 5,654,898 5,654,898
ProShares UltraShort Yen [Member]        
Cash flow from operating activities        
Net income (loss)   (3,504,622)   (24,283,937)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:        
Purchases of short-term U.S. government and agency obligations   (1,614,516,187)   (725,268,046)
Proceeds from sales or maturities of short-term U.S government and agency obligations   1,666,199,781   822,147,545
Net amortization and accretion on short-term U.S government and agency obligations   (671,139)   (683,531)
Net realized gain (loss) on investments   (3)   2,822
Change in unrealized appreciation/depreciation on investments   818,709   7,411,050
Decrease (Increase) in interest receivable   284    
Increase (Decrease) in payable to Sponsor   (39,284)   (98,643)
Net cash provided by (used in) operating activities   48,286,971   79,227,260
Cash flow from financing activities        
Proceeds from addition of shares   7,078,646   58,094,887
Payment on shares redeemed   (53,953,915)   (140,276,545)
Net cash provided by (used in) financing activities   (46,875,269)   (82,181,658)
Net increase (decrease) in cash   1,411,702   (2,954,398)
Cash, beginning of period   1,582,684   3,166,988
Cash, end of period 212,590 2,994,386 212,590 212,590
ProShares VIX Mid-Term Futures ETF [Member]        
Cash flow from operating activities        
Net income (loss)   5,802,591   (16,300,471)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:        
Purchases of short-term U.S. government and agency obligations   (716,928,015)   (111,882,112)
Proceeds from sales or maturities of short-term U.S government and agency obligations   738,000,000   132,492,968
Net amortization and accretion on short-term U.S government and agency obligations   (78,657)   (92,587)
Net realized gain (loss) on investments       527
Change in unrealized appreciation/depreciation on investments   187   (825)
Decrease (Increase) in receivable on futures contracts   138,249   135,434
Decrease (Increase) in interest receivable   (17,457)    
Increase (Decrease) in payable to Sponsor   (9,718)   (13,381)
Increase (Decrease) in payable on futures contracts   63,112    
Net cash provided by (used in) operating activities   26,970,292   4,339,553
Cash flow from financing activities        
Proceeds from addition of shares   14,069,811   5,865,630
Payment on shares redeemed   (27,413,967)   (6,918,150)
Net cash provided by (used in) financing activities   (13,344,156)   (1,052,520)
Net increase (decrease) in cash   13,626,136   3,287,033
Cash, beginning of period   6,266,358   2,207,730
Cash, end of period 5,494,763 19,892,494 5,494,763 5,494,763
ProShares VIX Short-Term Futures ETF [Member]        
Cash flow from operating activities        
Net income (loss)   67,879,545   (99,689,769)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:        
Purchases of short-term U.S. government and agency obligations   (3,094,662,941)   (372,565,894)
Proceeds from sales or maturities of short-term U.S government and agency obligations   3,207,914,328   382,028,962
Net amortization and accretion on short-term U.S government and agency obligations   (396,663)   (407,223)
Net realized gain (loss) on investments   1,993   1,362
Change in unrealized appreciation/depreciation on investments   (10,166)   (3,290)
Decrease (Increase) in receivable on futures contracts   250,108   (240,185)
Decrease (Increase) in interest receivable   34,133    
Increase (Decrease) in payable to Sponsor   (10,721)   (27,662)
Increase (Decrease) in payable on futures contracts   3,991,234   611,490
Net cash provided by (used in) operating activities   184,922,584   (90,292,209)
Cash flow from financing activities        
Proceeds from addition of shares   117,124,341   155,472,291
Payment on shares redeemed   (212,079,229)   (67,889,574)
Net cash provided by (used in) financing activities   (94,954,888)   87,582,717
Net increase (decrease) in cash   89,967,696   (2,709,492)
Cash, beginning of period   3,715,132   21,772,280
Cash, end of period $ 19,062,788 $ 93,682,828 $ 19,062,788 $ 19,062,788
[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).