ProShares Ultra Silver (AGQ) 10-K 1 Mar 18 2017 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2017	Feb. 26, 2018	Jun. 30, 2017
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Entity Registrant Name	ProShares Trust II
Entity Central Index Key	1,415,311
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		0
Entity Public Float			$ 0
ProShares Short Euro [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		200,000
Entity Public Float			10,427,500
ProShares Short VIX Short-Term Futures ETF [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		58,100,000
Entity Public Float			798,336,000
ProShares Ultra Bloomberg Crude Oil [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		16,611,317
Entity Public Float			962,353,171
ProShares Ultra Bloomberg Natural Gas [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		8,192,169
Entity Public Float			43,753,726
ProShares Ultra Euro [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		550,000
Entity Public Float			12,936,000
ProShares Ultra Gold [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		2,200,000
Entity Public Float			88,548,000
ProShares Ultra Silver [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		7,096,526
Entity Public Float			250,150,509
ProShares Ultra VIX Short-Term Futures ETF [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		23,327,238
Entity Public Float			375,260,850
ProShares Ultra Yen [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		49,970
Entity Public Float			5,866,240
Proshares Ultra Pro 3X Crude Oil ETF [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		300,008
Entity Public Float			20,664,157
Pro Shares UltraPro 3X Short Crude Oil ETF [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		2,450,008
Entity Public Float			5,248,210
ProShares UltraShort Australian Dollar [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		150,000
Entity Public Float			11,950,000
ProShares UltraShort Bloomberg Crude Oil [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		9,389,884
Entity Public Float			120,550,888
ProShares UltraShort Bloomberg Natural Gas [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		124,832
Entity Public Float			7,493,651
ProShares UltraShort Euro [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		9,350,000
Entity Public Float			236,980,000
ProShares UltraShort Gold [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		446,977
Entity Public Float			37,954,210
ProShares UltraShort Silver [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		566,976
Entity Public Float			22,737,212
ProShares UltraShort Yen [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		1,299,290
Entity Public Float			170,262,425
ProShares VIX Mid-Term Futures ETF [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		937,403
Entity Public Float			30,513,214
ProShares VIX Short-Term Futures ETF [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		2,926,317
Entity Public Float			$ 161,410,725

Statements of Financial Conditi

Statements of Financial Condition - USD ($)		Dec. 31, 2017		Dec. 31, 2016
Assets
Cash		$ 55,713,112		$ 39,482,473
Segregated cash balances with brokers for futures contracts		420,018,133		180,212,984
Segregated cash balances with brokers for forward agreements		4,081,500
Segregated cash balances with brokers for foreign currency forward contracts		3,960,000
Short-term U.S. government and agency obligations (Note 3)		2,445,779,873		3,038,848,441
Unrealized appreciation on swap agreements		62,238,361		55,358,571
Unrealized appreciation on forward agreements		25,381,689		4,417,812
Unrealized appreciation on foreign currency forward contracts		2,339,908		33,392,354
Receivable from capital shares sold		843,370
Receivable on open futures contracts		45,230,982		41,862,862
Offering costs (Note 5)		105,643
Limitation by Sponsor		59,651
Total assets		3,065,752,222		3,393,575,497
Liabilities
Payable for capital shares redeemed		73,270,557		71,525,035
Payable on open futures contracts		1,954,640		3,972,621
Brokerage commissions and fees payable				2,909
Payable to Sponsor		2,509,663		2,722,696
Unrealized depreciation on swap agreements		30,607,142		12,206,881
Unrealized depreciation on forward agreements		3,204,422		25,407,296
Unrealized depreciation on foreign currency forward contracts		6,927,586		1,400,572
Total liabilities		118,474,010		117,238,010
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity	[1]	2,947,278,212		3,276,337,487	[2]
Total liabilities and shareholders' equity		$ 3,065,752,222		$ 3,393,575,497
Shares outstanding		118,293,916		90,235,707
ProShares VIX Short-Term Futures ETF [Member]
Assets
Cash		$ 1,850,632		$ 4,536,425
Segregated cash balances with brokers for futures contracts		1,864,500		17,235,855
Short-term U.S. government and agency obligations (Note 3)		134,845,604		147,991,233
Receivable on open futures contracts		2,667,474		4,484,270
Total assets		141,228,210		174,247,783
Liabilities
Payable for capital shares redeemed		3,431,713
Payable to Sponsor		54,937		87,637
Total liabilities		3,486,650		87,637
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity		137,741,560		174,160,146
Total liabilities and shareholders' equity		$ 141,228,210		$ 174,247,783
Shares outstanding		5,901,317		2,052,363
Net asset value per share	[3]	$ 23.34		$ 84.86
Market value per share	[3],[4]	$ 23.15		$ 85.04
ProShares VIX Mid-Term Futures ETF [Member]
Assets
Cash		$ 1,639,958		$ 1,155,115
Segregated cash balances with brokers for futures contracts		4,626,400		1,052,615
Short-term U.S. government and agency obligations (Note 3)		20,993,515	[5]	45,486,235
Receivable on open futures contracts		170,015		242,541
Total assets		27,429,888		47,936,506
Liabilities
Payable for capital shares redeemed		1,058,309		2,085,020
Payable to Sponsor		23,631		32,572
Total liabilities		1,081,940		2,117,592
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity		26,347,948		45,818,914
Total liabilities and shareholders' equity		$ 27,429,888		$ 47,936,506
Shares outstanding		1,237,403		1,087,403
Net asset value per share		$ 21.29		$ 42.14
Market value per share	[4]	$ 21.15		$ 42.34
ProShares Short Euro [Member]
Assets
Cash		$ 923,063		$ 2,292,012
Segregated cash balances with brokers for futures contracts		122,430		402,600
Short-term U.S. government and agency obligations (Note 3)		6,996,235		13,164,828
Total assets		8,041,728		15,859,440
Liabilities
Payable on open futures contracts		43,311		76,666
Payable to Sponsor		6,537		12,686
Total liabilities		49,848		89,352
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity		7,991,880		15,770,088
Total liabilities and shareholders' equity		$ 8,041,728		$ 15,859,440
Shares outstanding		200,000		350,000
Net asset value per share		$ 39.96		$ 45.06
Market value per share	[4]	$ 39.99		$ 45.12
ProShares Short VIX Short-Term Futures ETF [Member]
Assets
Cash		$ 1,468,000		$ 1,850,760
Segregated cash balances with brokers for futures contracts		299,200,276		55,323,984
Short-term U.S. government and agency obligations (Note 3)		494,910,644		170,396,436
Receivable on open futures contracts		20,758,850		1,059,418
Total assets		816,337,770		228,630,598
Liabilities
Payable for capital shares redeemed		44,817,710		0
Payable on open futures contracts		528,750		325,000
Payable to Sponsor		827,439		230,211
Total liabilities		46,173,899		555,211
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity		770,163,871		228,075,387
Total liabilities and shareholders' equity		$ 816,337,770		$ 228,630,598
Shares outstanding		6,050,000		5,000,000
Net asset value per share	[3]	$ 127.30		$ 45.62
Market value per share	[3],[4]	$ 128.21		$ 45.49
ProShares Ultra Bloomberg Crude Oil [Member]
Assets
Cash		$ 1,532,748		$ 1,401,555
Segregated cash balances with brokers for futures contracts		8,796,755		20,609,600
Short-term U.S. government and agency obligations (Note 3)		459,515,902		885,050,007
Unrealized appreciation on swap agreements		62,238,361		55,358,571
Receivable on open futures contracts		2,242,001		0
Total assets		534,325,767		962,419,733
Liabilities
Payable for capital shares redeemed		9,464,420		25,879,004
Payable on open futures contracts				1,993,438
Brokerage commissions and fees payable				2,332
Payable to Sponsor		415,821		813,099
Total liabilities		9,880,241		28,687,873
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity		524,445,526		933,731,860
Total liabilities and shareholders' equity		$ 534,325,767		$ 962,419,733
Shares outstanding		22,161,317		40,013,933
Net asset value per share		$ 23.66		$ 23.34	[3]
Market value per share	[4]	$ 23.44		$ 23.36	[3]
ProShares Ultra Bloomberg Natural Gas [Member]
Assets
Cash		$ 4,417,324		$ 971,442
Segregated cash balances with brokers for futures contracts		10,299,573		7,612,770
Short-term U.S. government and agency obligations (Note 3)		50,961,356		36,183,648
Receivable from capital shares sold		326,440
Receivable on open futures contracts		1,520,156
Total assets		67,524,849		44,767,860
Liabilities
Payable for capital shares redeemed		4,211,794
Payable on open futures contracts				1,528,005
Brokerage commissions and fees payable				433
Payable to Sponsor		44,105		36,036
Total liabilities		4,255,899		1,564,474
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity		63,268,950		43,203,386
Total liabilities and shareholders' equity		$ 67,524,849		$ 44,767,860
Shares outstanding		9,692,169		2,292,169
Net asset value per share		$ 6.53		$ 18.85
Market value per share	[4]	$ 6.50		$ 18.96
ProShares Ultra Euro [Member]
Assets
Cash		$ 1,416,427		$ 606,393
Segregated cash balances with brokers for foreign currency forward contracts		922,000
Short-term U.S. government and agency obligations (Note 3)		6,996,235		11,891,831
Unrealized appreciation on foreign currency forward contracts		321,609		2,548
Total assets		9,656,271		12,500,772
Liabilities
Payable to Sponsor		7,298		9,629
Unrealized depreciation on foreign currency forward contracts		57,457		576,558
Total liabilities		64,755		586,187
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity		9,591,516		11,914,585
Total liabilities and shareholders' equity		$ 9,656,271		$ 12,500,772
Shares outstanding		550,000		850,000
Net asset value per share		$ 17.44		$ 14.02
Market value per share	[4]	$ 17.46		$ 14.09
ProShares Ultra Gold [Member]
Assets
Cash		$ 1,237,103		$ 1,262,351
Segregated cash balances with brokers for futures contracts		8,800		13,200
Short-term U.S. government and agency obligations (Note 3)		88,884,844		95,356,621
Unrealized appreciation on forward agreements		3,646,355
Receivable on open futures contracts		2,420
Total assets		93,779,522		96,632,172
Liabilities
Payable on open futures contracts				1,280
Payable to Sponsor		70,774		72,585
Unrealized depreciation on forward agreements				4,431,107
Total liabilities		70,774		4,504,972
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity		93,708,748		92,127,200
Total liabilities and shareholders' equity		$ 93,779,522		$ 96,632,172
Shares outstanding		2,350,000		2,800,000
Net asset value per share		$ 39.88		$ 32.90
Market value per share	[4]	$ 40.67		$ 33.20
ProShares Ultra Silver [Member]
Assets
Cash		$ 1,113,594		$ 1,664,601
Segregated cash balances with brokers for futures contracts		10,340		14,300
Segregated cash balances with brokers for forward agreements		3,343,000
Short-term U.S. government and agency obligations (Note 3)		235,581,716		295,300,799
Unrealized appreciation on forward agreements		21,735,334
Receivable on open futures contracts		2,220
Total assets		261,786,204		296,979,700
Liabilities
Payable for capital shares redeemed		3,354,851
Payable on open futures contracts				2,290
Payable to Sponsor		186,657		221,281
Unrealized depreciation on forward agreements				20,976,189
Total liabilities		3,541,508		21,199,760
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity		258,244,696		275,779,940
Total liabilities and shareholders' equity		$ 261,786,204		$ 296,979,700
Shares outstanding		7,696,526		8,246,526
Net asset value per share		$ 33.55		$ 33.44
Market value per share	[6]	$ 33.85		$ 32.09	[4]
ProShares Ultra VIX Short-Term Futures ETF [Member]
Assets
Cash		$ 1,539,237		$ 10,969,955
Segregated cash balances with brokers for futures contracts		87,211,683		71,363,625
Short-term U.S. government and agency obligations (Note 3)		287,533,132		434,671,795
Receivable from capital shares sold		516,930		0
Receivable on open futures contracts		17,578,451		35,967,191
Total assets		394,379,433		552,972,566
Liabilities
Payable for capital shares redeemed		0		36,789,539
Payable to Sponsor		344,292		424,273
Total liabilities		344,292		37,213,812
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity		394,035,141		515,758,754
Total liabilities and shareholders' equity		$ 394,379,433		$ 552,972,566
Shares outstanding		38,127,238		2,965,383
Net asset value per share	[3]	$ 10.33		$ 173.93
Market value per share	[3],[6]	$ 10.21		$ 175	[4]
ProShares Ultra Yen [Member]
Assets
Cash		$ 903,472		$ 604,691
Short-term U.S. government and agency obligations (Note 3)		1,997,933		5,282,879
Unrealized appreciation on foreign currency forward contracts				379
Total assets		2,901,405		5,887,949
Liabilities
Payable to Sponsor		2,312		4,537
Unrealized depreciation on foreign currency forward contracts		34,824		342,455
Total liabilities		37,136		346,992
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity		2,864,269		5,540,957
Total liabilities and shareholders' equity		$ 2,901,405		$ 5,887,949
Shares outstanding		49,970		99,970
Net asset value per share		$ 57.32		$ 55.43
Market value per share	[6]	$ 57.45		$ 55.52	[4]
ProShares UltraShort Australian Dollar [Member]
Assets
Cash		$ 1,297,022		$ 2,834,389
Segregated cash balances with brokers for futures contracts		485,375		914,760
Short-term U.S. government and agency obligations (Note 3)		11,983,904		12,909,619
Total assets		13,766,301		16,658,768
Liabilities
Payable on open futures contracts		52,950		32,340
Payable to Sponsor		11,249		12,955
Total liabilities		64,199		45,295
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity		13,702,102		16,613,473
Total liabilities and shareholders' equity		$ 13,766,301		$ 16,658,768
Shares outstanding		300,000		300,000
Net asset value per share		$ 45.67		$ 55.38
Market value per share	[6]	$ 45.72		$ 55.24	[4]
ProShares UltraShort Euro [Member]
Assets
Cash		$ 1,255,895		$ 2,916,502
Segregated cash balances with brokers for foreign currency forward contracts		3,038,000
Short-term U.S. government and agency obligations (Note 3)		204,770,166		337,375,787
Unrealized appreciation on foreign currency forward contracts		449,302		16,519,070
Total assets		209,513,363		356,811,359
Liabilities
Payable for capital shares redeemed				6,771,472
Payable to Sponsor		171,595		291,098
Unrealized depreciation on foreign currency forward contracts		6,793,571		356,139
Total liabilities		6,965,166		7,418,709
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity		202,548,197		349,392,650
Total liabilities and shareholders' equity		$ 209,513,363		$ 356,811,359
Shares outstanding		9,550,000		12,900,000
Net asset value per share		$ 21.21		$ 27.08
Market value per share	[4]	$ 21.20		$ 27.08
ProShares UltraShort Silver [Member]
Assets
Cash		$ 614,804		$ 86,051
Segregated cash balances with brokers for futures contracts		10,340		14,300
Segregated cash balances with brokers for forward agreements		738,500
Short-term U.S. government and agency obligations (Note 3)		18,349,861		21,550,319
Unrealized appreciation on forward agreements				1,384,246
Receivable on open futures contracts				2,290
Total assets		19,713,505		23,037,206
Liabilities
Payable for capital shares redeemed		3,171,777
Payable on open futures contracts		2,220
Payable to Sponsor		17,086		19,550
Unrealized depreciation on forward agreements		1,716,163
Total liabilities		4,907,246		19,550
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity		14,806,259		23,017,656
Total liabilities and shareholders' equity		$ 19,713,505		$ 23,037,206
Shares outstanding		466,976		616,976
Net asset value per share		$ 31.71		$ 37.31
Market value per share	[4]	$ 31.40		$ 38.76
ProShares UltraShort Yen [Member]
Assets
Cash		$ 1,582,684		$ 3,166,988
Short-term U.S. government and agency obligations (Note 3)		131,834,352		257,102,313
Unrealized appreciation on foreign currency forward contracts		1,568,997		16,870,357
Total assets		134,986,033		277,139,658
Liabilities
Payable for capital shares redeemed		3,759,983
Payable to Sponsor		106,863		232,491
Unrealized depreciation on foreign currency forward contracts		41,734		125,420
Total liabilities		3,908,580		357,911
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity		131,077,453		276,781,747
Total liabilities and shareholders' equity		$ 134,986,033		$ 277,139,658
Shares outstanding		1,749,290		3,449,290
Net asset value per share		$ 74.93		$ 80.24
Market value per share	[4]	$ 74.98		$ 80.25
ProShares UltraPro 3x Crude Oil ETF [Member]
Assets
Cash	[7]	$ 9,683,852
Segregated cash balances with brokers for futures contracts	[7]	1,285,048
Receivable on open futures contracts	[7]	289,395
Offering costs (Note 5)	[7]	52,846
Limitation by Sponsor	[7]	24,342
Total assets	[7]	11,335,483
Liabilities
Commitments and Contingencies (Note 2)	[7]
Shareholders' equity
Shareholders' equity	[8]	11,335,483	[7]	$ 0
Total liabilities and shareholders' equity	[7]	$ 11,335,483
Shares outstanding	[7]	300,008
Net asset value per share	[7]	$ 37.78
Market value per share	[7]	$ 37.23
Pro Shares UltraPro 3X Short Crude Oil ETF [Member]
Assets
Cash	[7]	$ 19,203,543
Segregated cash balances with brokers for futures contracts	[7]	2,396,625
Offering costs (Note 5)	[7]	52,797
Limitation by Sponsor	[7]	35,309
Total assets	[7]	21,688,274
Liabilities
Payable on open futures contracts	[7]	527,098
Total liabilities	[7]	527,098
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity	[8]	21,161,176	[7]	$ 0
Total liabilities and shareholders' equity	[7]	$ 21,688,274
Shares outstanding	[7]	2,000,008
Net asset value per share	[9]	$ 10.58	[7]	$ 25
Market value per share	[6],[9]	$ 10.72	[7]	$ 25
ProShares UltraShort Bloomberg Crude Oil [Member]
Assets
Cash		$ 1,120,278		$ 2,715,772
Segregated cash balances with brokers for futures contracts		2,567,813		4,931,520
Short-term U.S. government and agency obligations (Note 3)		253,646,823		205,694,385
Total assets		257,334,914		213,341,677
Liabilities
Payable on open futures contracts		693,787		13,602
Payable to Sponsor		190,701		162,891
Unrealized depreciation on swap agreements		30,607,142		12,206,881
Total liabilities		31,491,630		12,383,374
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity		225,843,284		200,958,303
Total liabilities and shareholders' equity		$ 257,334,914		$ 213,341,677
Shares outstanding		9,289,884		6,339,884
Net asset value per share		$ 24.31		$ 31.70	[3]
Market value per share	[4]	$ 24.56		$ 31.65	[3]
ProShares UltraShort Bloomberg Natural Gas [Member]
Assets
Cash		$ 1,886,831		$ 326,631
Segregated cash balances with brokers for futures contracts		1,123,375		710,655
Short-term U.S. government and agency obligations (Note 3)		3,999,751		2,899,151
Receivable on open futures contracts				105,872
Total assets		7,009,957		4,042,309
Liabilities
Payable on open futures contracts		104,104
Brokerage commissions and fees payable				144
Payable to Sponsor		3,110		3,371
Total liabilities		107,214		3,515
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity		6,902,743		4,038,794
Total liabilities and shareholders' equity		$ 7,009,957		$ 4,042,309
Shares outstanding		174,832		174,832
Net asset value per share		$ 39.48		$ 23.10	[3]
Market value per share	[4]	$ 39.65		$ 23.05	[3]
ProShares UltraShort Gold [Member]
Assets
Cash		$ 1,026,645		$ 120,840
Segregated cash balances with brokers for futures contracts		8,800		13,200
Short-term U.S. government and agency obligations (Note 3)		31,977,900		60,540,555
Unrealized appreciation on forward agreements				3,033,566
Receivable on open futures contracts				1,280
Total assets		33,013,345		63,709,441
Liabilities
Payable on open futures contracts		2,420
Payable to Sponsor		25,256		55,794
Unrealized depreciation on forward agreements		1,488,259
Total liabilities		1,515,935		55,794
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity		31,497,410		63,653,647
Total liabilities and shareholders' equity		$ 33,013,345		$ 63,709,441
Shares outstanding		446,978		696,978
Net asset value per share		$ 70.47		$ 91.33
Market value per share	[4]	$ 69.11		$ 90.54
[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).
[2]	The operations include the activity of: ProShares Managed Futures Strategy through March 30, 2016, ProShares UltraShort Bloomberg Commodity and ProShares Ultra Bloomberg Commodity through September 1, 2016, the date of liquidation, respectively.
[3]	See Note 1 of these Notes to Financial Statements.
[4]	Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds' net asset value is calculated.
[5]	Rates shown represents discount rate at the time of purchase.
[6]	Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds' net asset value is calculated. For ProShares UltraPro 3x Crude Oil ETF and ProShares UltraPro 3x Short Crude Oil ETF, the returns of shares outstanding for the period from commencement of operations through December 31, 2017 are calculated based on the initial offering price upon commencement of operations of $25.00.
[7]	Since the Fund's inception date was January 13, 2017, the Statement of Financial Condition as of December 31, 2016 has not been provided.
[8]	Since the Fund's inception date was January 13, 2017, the Statements of Changes in Shareholders' Equity for the years ended December 31, 2016 and December 31, 2015 have not been provided.
[9]	From commencement of operations, March 24, 2017 through December 31, 2017.

Statements of Financial Condit3

Statements of Financial Condition (Parenthetical) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Short-term U.S. government and agency obligations, cost (Note 3)	$ 2,445,970,899	$ 3,038,837,465
ProShares VIX Short-Term Futures ETF [Member]
Short-term U.S. government and agency obligations, cost (Note 3)	134,855,770	147,990,045
ProShares VIX Mid-Term Futures ETF [Member]
Short-term U.S. government and agency obligations, cost (Note 3)	20,993,328	45,486,489
ProShares Short Euro [Member]
Short-term U.S. government and agency obligations, cost (Note 3)	6,996,595	13,164,807
ProShares Short VIX Short-Term Futures ETF [Member]
Short-term U.S. government and agency obligations, cost (Note 3)	494,962,509	170,391,741
ProShares Ultra Bloomberg Crude Oil [Member]
Short-term U.S. government and agency obligations, cost (Note 3)	459,543,053	885,046,303
ProShares Ultra Bloomberg Natural Gas [Member]
Short-term U.S. government and agency obligations, cost (Note 3)	50,963,586	36,183,384
ProShares Ultra Euro [Member]
Short-term U.S. government and agency obligations, cost (Note 3)	6,996,595	11,891,729
ProShares Ultra Gold [Member]
Short-term U.S. government and agency obligations, cost (Note 3)	88,890,367	95,356,703
ProShares Ultra Silver [Member]
Short-term U.S. government and agency obligations, cost (Note 3)	235,605,469	295,296,440
ProShares Ultra VIX Short-Term Futures ETF [Member]
Short-term U.S. government and agency obligations, cost (Note 3)	287,546,397	434,676,067
ProShares Ultra Yen [Member]
Short-term U.S. government and agency obligations, cost (Note 3)	1,998,216	5,283,104
ProShares UltraShort Australian Dollar [Member]
Short-term U.S. government and agency obligations, cost (Note 3)	11,984,898	12,909,895
ProShares UltraShort Euro [Member]
Short-term U.S. government and agency obligations, cost (Note 3)	204,788,208	337,373,566
ProShares UltraShort Silver [Member]
Short-term U.S. government and agency obligations, cost (Note 3)	18,352,808	21,549,766
ProShares UltraShort Yen [Member]
Short-term U.S. government and agency obligations, cost (Note 3)	131,844,652	257,103,135
ProShares UltraShort Bloomberg Crude Oil [Member]
Short-term U.S. government and agency obligations, cost (Note 3)	253,669,155	205,694,828
ProShares UltraShort Bloomberg Natural Gas [Member]
Short-term U.S. government and agency obligations, cost (Note 3)	3,999,667	2,899,188
ProShares UltraShort Gold [Member]
Short-term U.S. government and agency obligations, cost (Note 3)	$ 31,979,626	$ 60,540,275

Statements of Operations

Statements of Operations - USD ($)		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Investment Income
Interest		$ 25,704,093	[1]	$ 9,133,928	[2]	$ 1,546,729	[3]
Expenses
Management fee		30,996,127	[1]	34,712,239	[2]	35,055,606	[3]
Brokerage commissions		8,950,082	[1]	7,438,871	[2]	6,480,284	[3]
Brokerage fees	[1]	9,715
Offering costs		238,151	[1]			59,479	[3]
Limitation by Sponsor		(59,651)	[1]			(11,814)	[3]
Total expenses		40,134,424	[1]	42,151,110	[2]	41,583,555	[3]
Net investment income (loss)		(14,430,331)	[1]	(33,017,182)	[2]	(40,036,826)	[3]
Net realized gain (loss) on
Foreign currency forward contracts		(46,255,034)	[1]	(47,075,744)	[2]	138,005,915	[3]
Short-term U.S. government and agency obligations		(50,042)	[1]	(15,768)	[2]	47,732	[3]
Net realized gain (loss)		(438,531,686)	[1]	(1,320,602,359)	[2]	(1,164,531,561)	[3]
Change in net unrealized appreciation/depreciation on
Futures contracts		(360,935)	[1]	(22,030,613)	[2]	40,193,356	[3]
Foreign currency forward contracts		(36,579,460)	[1]	73,731,339	[2]	(56,805,160)	[3]
Short-term U.S. government and agency obligations		(202,002)	[1]	4,832	[2]	(46,135)	[3]
Change in net unrealized appreciation/depreciation		(5,496,117)	[1]	157,868,764	[2]	(39,700,049)	[3]
Net realized and unrealized gain (loss)		(444,027,803)	[1]	(1,162,733,595)	[2]	(1,204,231,610)	[3]
Net income (loss)		(458,458,134)	[1]	(1,195,750,777)	[2],[4]	(1,244,268,436)	[3]
Futures Contracts [Member]
Net realized gain (loss) on
Gain (loss) on sale of derivatives		(354,314,223)	[1]	(1,286,470,453)	[2]	(675,706,798)	[3]
Swap Agreements [Member]
Net realized gain (loss) on
Gain (loss) on sale of derivatives		(11,794,313)	[1]	(25,398,375)	[2]	(553,434,721)	[3]
Change in net unrealized appreciation/depreciation on
Unrealized gain (loss) on derivatives		(11,520,471)	[1]	108,928,215	[2]	(16,849,426)	[3]
Forward Agreements [Member]
Net realized gain (loss) on
Gain (loss) on sale of derivatives		(26,118,074)	[1]	38,357,981	[2]	(73,443,689)	[3]
Change in net unrealized appreciation/depreciation on
Unrealized gain (loss) on derivatives		43,166,751	[1]	(2,765,009)	[2]	(6,192,684)	[3]
ProShares Short Euro [Member]
Investment Income
Interest		75,953		32,959		4,504
Expenses
Management fee		111,736		153,021		179,286
Brokerage commissions		1,844		2,666		3,979
Total expenses		113,580		155,687		183,265
Net investment income (loss)		(37,627)		(122,728)		(178,761)
Net realized gain (loss) on
Short-term U.S. government and agency obligations		(384)		33		218
Net realized gain (loss)		(1,162,371)		663,807		1,559,643
Change in net unrealized appreciation/depreciation on
Futures contracts		(299,188)		(110,538)		(141,893)
Short-term U.S. government and agency obligations		(381)		12		(170)
Change in net unrealized appreciation/depreciation		(299,569)		(110,526)		(142,063)
Net realized and unrealized gain (loss)		(1,461,940)		553,281		1,417,580
Net income (loss)		(1,499,567)		430,553		1,238,819
ProShares Short Euro [Member] | Futures Contracts [Member]
Net realized gain (loss) on
Gain (loss) on sale of derivatives		(1,161,987)		663,774		1,559,425
ProShares Short VIX Short-Term Futures ETF [Member]
Investment Income
Interest		6,001,679		1,126,057		180,686
Expenses
Management fee		7,147,223		4,448,808		4,043,491
Brokerage commissions		4,226,442		2,074,099		1,935,395
Brokerage fees		1,558
Total expenses		11,375,223		6,522,907		5,978,886
Net investment income (loss)		(5,373,544)		(5,396,850)		(5,798,200)
Net realized gain (loss) on
Short-term U.S. government and agency obligations		(443)		(11,670)		35,629
Net realized gain (loss)		897,400,073		440,379,719		69,828,657
Change in net unrealized appreciation/depreciation on
Futures contracts		27,351,060		(21,056,026)		27,098,564
Short-term U.S. government and agency obligations		(56,560)		(6,824)		8,936
Change in net unrealized appreciation/depreciation		27,294,500		(21,062,850)		27,107,500
Net realized and unrealized gain (loss)		924,694,573		419,316,869		96,936,157
Net income (loss)		919,321,029		413,920,019		91,137,957
ProShares Short VIX Short-Term Futures ETF [Member] | Futures Contracts [Member]
Net realized gain (loss) on
Gain (loss) on sale of derivatives		897,400,516		440,391,389		69,793,028
ProShares Ultra Bloomberg Crude Oil [Member]
Investment Income
Interest		5,982,049		2,170,633		396,158
Expenses
Management fee		7,120,247		8,263,078		8,230,180
Brokerage commissions		241,263		538,935		639,133
Total expenses		7,361,510		8,802,013		8,869,313
Net investment income (loss)		(1,379,461)		(6,631,380)		(8,473,155)
Net realized gain (loss) on
Short-term U.S. government and agency obligations		(14,496)		(17,374)		22,728
Net realized gain (loss)		22,131,716		74,043,666		(896,154,368)
Change in net unrealized appreciation/depreciation on
Futures contracts		6,408,814		23,466,479		28,545,473
Short-term U.S. government and agency obligations		(30,855)		5,463		(6,857)
Change in net unrealized appreciation/depreciation		13,257,749		151,007,102		32,543,124
Net realized and unrealized gain (loss)		35,389,465		225,050,768		(863,611,244)
Net income (loss)		34,010,004		218,419,388		(872,084,399)
ProShares Ultra Bloomberg Crude Oil [Member] | Futures Contracts [Member]
Net realized gain (loss) on
Gain (loss) on sale of derivatives		28,048,922		43,093,616		(297,227,106)
ProShares Ultra Bloomberg Crude Oil [Member] | Swap Agreements [Member]
Net realized gain (loss) on
Gain (loss) on sale of derivatives		(5,902,710)		30,967,424		(598,949,990)
Change in net unrealized appreciation/depreciation on
Unrealized gain (loss) on derivatives		6,879,790		127,535,160		4,004,508
ProShares Ultra Bloomberg Natural Gas [Member]
Investment Income
Interest		339,079		72,943		20,167
Expenses
Management fee		446,589		325,435		574,158
Brokerage commissions		126,252		131,994		207,344
Total expenses		572,841		457,429		781,502
Net investment income (loss)		(233,762)		(384,486)		(761,335)
Net realized gain (loss) on
Short-term U.S. government and agency obligations		(1,021)		(698)		4,341
Net realized gain (loss)		(40,794,286)		17,571,111		(100,772,476)
Change in net unrealized appreciation/depreciation on
Futures contracts		4,689,090		(3,776,159)		41,202,162
Short-term U.S. government and agency obligations		(2,494)		(819)		(296)
Change in net unrealized appreciation/depreciation		4,686,596		(3,776,978)		41,201,866
Net realized and unrealized gain (loss)		(36,107,690)		13,794,133		(59,570,610)
Net income (loss)		(36,341,452)		13,409,647		(60,331,945)
ProShares Ultra Bloomberg Natural Gas [Member] | Futures Contracts [Member]
Net realized gain (loss) on
Gain (loss) on sale of derivatives		(40,793,265)		17,571,809		(100,776,817)
ProShares Ultra Euro [Member]
Investment Income
Interest		94,761		25,015		2,797
Expenses
Management fee		124,543		99,537		106,868
Total expenses		124,543		99,537		106,868
Net investment income (loss)		(29,782)		(74,522)		(104,071)
Net realized gain (loss) on
Foreign currency forward contracts		2,212,313		138,959		(1,982,208)
Short-term U.S. government and agency obligations		(87)		154		(109)
Net realized gain (loss)		2,212,226		139,113		(1,982,317)
Change in net unrealized appreciation/depreciation on
Foreign currency forward contracts		838,162		(1,178,930)		708,291
Short-term U.S. government and agency obligations		(462)		505		(369)
Change in net unrealized appreciation/depreciation		837,700		(1,178,425)		707,922
Net realized and unrealized gain (loss)		3,049,926		(1,039,312)		(1,274,395)
Net income (loss)		3,020,144		(1,113,834)		(1,378,466)
ProShares Ultra Gold [Member]
Investment Income
Interest		766,560		249,319		42,700
Expenses
Management fee		902,841		900,227		839,083
Brokerage commissions		48		43		41
Total expenses		902,889		900,270		839,124
Net investment income (loss)		(136,329)		(650,951)		(796,424)
Net realized gain (loss) on
Short-term U.S. government and agency obligations		691		(806)		(393)
Net realized gain (loss)		11,485,101		5,815,759		(18,606,208)
Change in net unrealized appreciation/depreciation on
Futures contracts		24,440		(13,760)		(9,780)
Short-term U.S. government and agency obligations		(5,441)		(4,389)		2,086
Change in net unrealized appreciation/depreciation		8,096,461		(2,198,661)		(4,309,443)
Net realized and unrealized gain (loss)		19,581,562		3,617,098		(22,915,651)
Net income (loss)		19,445,233		2,966,147		(23,712,075)
ProShares Ultra Gold [Member] | Futures Contracts [Member]
Net realized gain (loss) on
Gain (loss) on sale of derivatives		2,839		29,500		(16,180)
ProShares Ultra Gold [Member] | Forward Agreements [Member]
Net realized gain (loss) on
Gain (loss) on sale of derivatives		11,481,571		5,787,065		(18,589,635)
Change in net unrealized appreciation/depreciation on
Unrealized gain (loss) on derivatives		8,077,462		(2,180,512)		(4,301,749)
ProShares Ultra Silver [Member]
Investment Income
Interest		2,142,183		842,215		156,353
Expenses
Management fee		2,551,877		3,021,562		2,664,160
Brokerage commissions		58		45		52
Total expenses		2,551,935		3,021,607		2,664,212
Net investment income (loss)		(409,752)		(2,179,392)		(2,507,859)
Net realized gain (loss) on
Short-term U.S. government and agency obligations		207		145		(441)
Net realized gain (loss)		(31,762,627)		62,342,586		(78,309,750)
Change in net unrealized appreciation/depreciation on
Futures contracts		28,960		(18,330)		(7,470)
Short-term U.S. government and agency obligations		(28,112)		4,909		(9,125)
Change in net unrealized appreciation/depreciation		42,712,371		1,571,491		(10,182,576)
Net realized and unrealized gain (loss)		10,949,744		63,914,077		(88,492,326)
Net income (loss)		10,539,992		61,734,685		(91,000,185)
ProShares Ultra Silver [Member] | Futures Contracts [Member]
Net realized gain (loss) on
Gain (loss) on sale of derivatives		(21,522)		45,750		(19,600)
ProShares Ultra Silver [Member] | Forward Agreements [Member]
Net realized gain (loss) on
Gain (loss) on sale of derivatives		(31,741,312)		62,296,691		(78,289,709)
Change in net unrealized appreciation/depreciation on
Unrealized gain (loss) on derivatives		42,711,523		1,584,912		(10,165,981)
ProShares Ultra VIX Short-Term Futures ETF [Member]
Investment Income
Interest		3,040,059		1,639,964		156,187
Expenses
Management fee		3,960,999		6,417,822		4,362,460
Brokerage commissions		3,970,588		4,158,919		3,203,875
Brokerage fees		4,533
Total expenses		7,936,120		10,576,741		7,566,335
Net investment income (loss)		(4,896,061)		(8,936,777)		(7,410,148)
Net realized gain (loss) on
Short-term U.S. government and agency obligations		(21,942)		15,949		(49,718)
Net realized gain (loss)		(1,020,772,793)		(1,567,324,739)		(392,223,946)
Change in net unrealized appreciation/depreciation on
Futures contracts		(26,493,883)		(19,866,703)		(27,690,787)
Short-term U.S. government and agency obligations		(8,993)		(28,844)		26,647
Change in net unrealized appreciation/depreciation		(26,502,876)		(19,895,547)		(27,664,140)
Net realized and unrealized gain (loss)		(1,047,275,669)		(1,587,220,286)		(419,888,086)
Net income (loss)		(1,052,171,730)		(1,596,157,063)		(427,298,234)
ProShares Ultra VIX Short-Term Futures ETF [Member] | Futures Contracts [Member]
Net realized gain (loss) on
Gain (loss) on sale of derivatives		(1,020,750,851)		(1,567,340,688)		(392,174,228)
ProShares Ultra Yen [Member]
Investment Income
Interest		28,639		16,858		3,609
Expenses
Management fee		50,521		62,705		48,032
Total expenses		50,521		62,705		48,032
Net investment income (loss)		(21,882)		(45,847)		(44,423)
Net realized gain (loss) on
Foreign currency forward contracts		(46,195)		717,086		(472,913)
Short-term U.S. government and agency obligations		(83)		(34)		6
Net realized gain (loss)		(46,278)		717,052		(472,907)
Change in net unrealized appreciation/depreciation on
Foreign currency forward contracts		307,252		(603,387)		276,556
Short-term U.S. government and agency obligations		(58)		(510)		260
Change in net unrealized appreciation/depreciation		307,194		(603,897)		276,816
Net realized and unrealized gain (loss)		260,916		113,155		(196,091)
Net income (loss)		239,034		67,308		(240,514)
ProShares UltraShort Australian Dollar [Member]
Investment Income
Interest		85,306		43,459		5,998
Expenses
Management fee		123,234		175,191		199,845
Brokerage commissions		8,846		13,920		16,140
Total expenses		132,080		189,111		215,985
Net investment income (loss)		(46,774)		(145,652)		(209,987)
Net realized gain (loss) on
Short-term U.S. government and agency obligations		(178)		495		225
Net realized gain (loss)		(866,949)		(2,786,709)		4,330,688
Change in net unrealized appreciation/depreciation on
Futures contracts		(2,075,560)		1,602,610		(1,163,751)
Short-term U.S. government and agency obligations		(718)		279		(553)
Change in net unrealized appreciation/depreciation		(2,076,278)		1,602,889		(1,164,304)
Net realized and unrealized gain (loss)		(2,943,227)		(1,183,820)		3,166,384
Net income (loss)		(2,990,001)		(1,329,472)		2,956,397
ProShares UltraShort Australian Dollar [Member] | Futures Contracts [Member]
Net realized gain (loss) on
Gain (loss) on sale of derivatives		(866,771)		(2,787,204)		4,330,463
ProShares UltraShort Bloomberg Crude Oil [Member]
Investment Income
Interest		1,661,295		500,160		60,884
Expenses
Management fee		1,934,688		1,755,696		1,978,613
Brokerage commissions		82,258		153,428		248,482
Total expenses		2,016,946		1,909,124		2,227,095
Net investment income (loss)		(355,651)		(1,408,964)		(2,166,211)
Net realized gain (loss) on
Short-term U.S. government and agency obligations		(448)		(4,064)		14,458
Net realized gain (loss)		(6,491,508)		(67,756,228)		91,684,782
Change in net unrealized appreciation/depreciation on
Futures contracts		(2,535,833)		(3,891,328)		(13,342,090)
Short-term U.S. government and agency obligations		(21,889)		1,712		(4,396)
Change in net unrealized appreciation/depreciation		(20,957,983)		(22,509,153)		(33,951,907)
Net realized and unrealized gain (loss)		(27,449,491)		(90,265,381)		57,732,875
Net income (loss)		(27,805,142)		(91,674,345)		55,566,664
ProShares UltraShort Bloomberg Crude Oil [Member] | Futures Contracts [Member]
Net realized gain (loss) on
Gain (loss) on sale of derivatives		(599,457)		(12,045,454)		46,904,474
ProShares UltraShort Bloomberg Crude Oil [Member] | Swap Agreements [Member]
Net realized gain (loss) on
Gain (loss) on sale of derivatives		(5,891,603)		(55,706,710)		44,765,850
Change in net unrealized appreciation/depreciation on
Unrealized gain (loss) on derivatives		(18,400,261)		(18,619,537)		(20,605,421)
ProShares UltraShort Bloomberg Natural Gas [Member]
Investment Income
Interest		38,651		19,053		5,830
Expenses
Management fee		63,534		81,259		112,277
Brokerage commissions		29,529		59,966		70,677
Brokerage fees		39
Total expenses		93,102		141,225		182,954
Net investment income (loss)		(54,451)		(122,172)		(177,124)
Net realized gain (loss) on
Short-term U.S. government and agency obligations		(783)		3,139		29
Net realized gain (loss)		4,761,749		589,999		15,212,833
Change in net unrealized appreciation/depreciation on
Futures contracts		(615,018)		1,989,133		(6,412,629)
Short-term U.S. government and agency obligations		121		(388)		168
Change in net unrealized appreciation/depreciation		(614,897)		1,988,745		(6,412,461)
Net realized and unrealized gain (loss)		4,146,852		2,578,744		8,800,372
Net income (loss)		4,092,401		2,456,572		8,623,248
ProShares UltraShort Bloomberg Natural Gas [Member] | Futures Contracts [Member]
Net realized gain (loss) on
Gain (loss) on sale of derivatives		4,762,532		586,860		15,212,804
ProShares UltraShort Euro [Member]
Investment Income
Interest		2,048,455		1,012,886		264,845
Expenses
Management fee		2,445,170		3,777,543		5,265,432
Total expenses		2,445,170		3,777,543		5,265,432
Net investment income (loss)		(396,715)		(2,764,657)		(5,000,587)
Net realized gain (loss) on
Foreign currency forward contracts		(39,691,680)		(25,711,518)		131,651,572
Short-term U.S. government and agency obligations		(3,785)		242		22,509
Net realized gain (loss)		(39,695,465)		(25,711,276)		131,674,081
Change in net unrealized appreciation/depreciation on
Foreign currency forward contracts		(22,507,200)		44,873,267		(45,473,330)
Short-term U.S. government and agency obligations		(20,263)		12,675		(23,782)
Change in net unrealized appreciation/depreciation		(22,527,463)		44,885,942		(45,497,112)
Net realized and unrealized gain (loss)		(62,222,928)		19,174,666		86,176,969
Net income (loss)		(62,619,643)		16,410,009		81,176,382
ProShares UltraShort Gold [Member]
Investment Income
Interest		283,917		164,570		31,999
Expenses
Management fee		344,734		625,950		735,540
Brokerage commissions		48		43		41
Total expenses		344,782		625,993		735,581
Net investment income (loss)		(60,865)		(461,423)		(703,582)
Net realized gain (loss) on
Short-term U.S. government and agency obligations		(1,208)		(378)		1,301
Net realized gain (loss)		(6,994,765)		(12,241,129)		12,708,936
Change in net unrealized appreciation/depreciation on
Futures contracts		(24,440)		13,760		9,740
Short-term U.S. government and agency obligations		(2,006)		2,028		(2,950)
Change in net unrealized appreciation/depreciation		(4,548,271)		1,240,412		4,098,510
Net realized and unrealized gain (loss)		(11,543,036)		(11,000,717)		16,807,446
Net income (loss)		(11,603,901)		(11,462,140)		16,103,864
ProShares UltraShort Gold [Member] | Futures Contracts [Member]
Net realized gain (loss) on
Gain (loss) on sale of derivatives		(2,987)		(29,440)		15,950
ProShares UltraShort Gold [Member] | Forward Agreements [Member]
Net realized gain (loss) on
Gain (loss) on sale of derivatives		(6,990,570)		(12,211,311)		12,691,685
Change in net unrealized appreciation/depreciation on
Unrealized gain (loss) on derivatives		(4,521,825)		1,224,624		4,091,720
ProShares UltraShort Silver [Member]
Investment Income
Interest		157,745		93,483		23,831
Expenses
Management fee		194,297		349,293		540,253
Brokerage commissions		48		43		42
Total expenses		194,345		349,336		540,295
Net investment income (loss)		(36,600)		(255,853)		(516,464)
Net realized gain (loss) on
Short-term U.S. government and agency obligations		(932)		(1,916)		(2,787)
Net realized gain (loss)		1,152,461		(17,556,630)		10,756,758
Change in net unrealized appreciation/depreciation on
Futures contracts		(28,960)		21,340		4,410
Short-term U.S. government and agency obligations		(3,500)		367		(794)
Change in net unrealized appreciation/depreciation		(3,132,869)		(3,372,326)		4,186,942
Net realized and unrealized gain (loss)		(1,980,408)		(20,928,956)		14,943,700
Net income (loss)		(2,017,008)		(21,184,809)		14,427,236
ProShares UltraShort Silver [Member] | Futures Contracts [Member]
Net realized gain (loss) on
Gain (loss) on sale of derivatives		21,156		(40,250)		15,575
ProShares UltraShort Silver [Member] | Forward Agreements [Member]
Net realized gain (loss) on
Gain (loss) on sale of derivatives		1,132,237		(17,514,464)		10,743,970
Change in net unrealized appreciation/depreciation on
Unrealized gain (loss) on derivatives		(3,100,409)		(3,394,033)		4,183,326
ProShares UltraShort Yen [Member]
Investment Income
Interest		1,446,842		531,771		135,814
Expenses
Management fee		1,802,816		2,141,333		3,759,492
Total expenses		1,802,816		2,141,333		3,759,492
Net investment income (loss)		(355,974)		(1,609,562)		(3,623,678)
Net realized gain (loss) on
Foreign currency forward contracts		(8,729,472)		(22,220,271)		8,809,464
Short-term U.S. government and agency obligations		(4,001)		(5,910)		(3,035)
Net realized gain (loss)		(8,733,473)		(22,226,181)		8,806,429
Change in net unrealized appreciation/depreciation on
Foreign currency forward contracts		(15,217,674)		30,640,389		(12,316,677)
Short-term U.S. government and agency obligations		(9,478)		16,827		(30,886)
Change in net unrealized appreciation/depreciation		(15,227,152)		30,657,216		(12,347,563)
Net realized and unrealized gain (loss)		(23,960,625)		8,431,035		(3,541,134)
Net income (loss)		(24,316,599)		6,821,473		(7,164,812)
ProShares VIX Mid-Term Futures ETF [Member]
Investment Income
Interest		256,920		107,409		8,293
Expenses
Management fee		317,739		369,016		233,390
Brokerage commissions		20,988		32,884		15,503
Total expenses		338,727		401,900		248,893
Net investment income (loss)		(81,807)		(294,491)		(240,600)
Net realized gain (loss) on
Short-term U.S. government and agency obligations		(377)		499		1,355
Net realized gain (loss)		(25,320,147)		(11,085,007)		(3,334,581)
Change in net unrealized appreciation/depreciation on
Futures contracts		(927,035)		(943,885)		(605,025)
Short-term U.S. government and agency obligations		441		(1,079)		(327)
Change in net unrealized appreciation/depreciation		(926,594)		(944,964)		(605,352)
Net realized and unrealized gain (loss)		(26,246,741)		(12,029,971)		(3,939,933)
Net income (loss)		(26,328,548)		(12,324,462)		(4,180,533)
ProShares VIX Mid-Term Futures ETF [Member] | Futures Contracts [Member]
Net realized gain (loss) on
Gain (loss) on sale of derivatives		(25,319,770)		(11,085,506)		(3,335,936)
ProShares UltraPro 3x Crude Oil ETF [Member]
Investment Income
Interest	[5]	9,696
Expenses
Brokerage commissions	[5]	34,408
Brokerage fees	[5]	67
Offering costs	[5],[6]	119,081
Limitation by Sponsor	[5]	(24,342)
Total expenses	[5]	129,214
Net investment income (loss)	[5],[7]	(119,518)
Net realized gain (loss) on
Net realized gain (loss)	[5]	6,018,618
Change in net unrealized appreciation/depreciation on
Futures contracts	[5]	1,417,998
Change in net unrealized appreciation/depreciation	[5]	1,417,998
Net realized and unrealized gain (loss)	[5]	7,436,616
Net income (loss)	[5],[6],[7]	7,317,098
ProShares UltraPro 3x Crude Oil ETF [Member] | Futures Contracts [Member]
Net realized gain (loss) on
Gain (loss) on sale of derivatives	[5]	6,018,618
Pro Shares UltraPro 3X Short Crude Oil ETF [Member]
Investment Income
Interest	[5]	5,930
Expenses
Brokerage commissions	[5]	32,624
Brokerage fees	[5]	135
Offering costs	[5],[6]	119,070
Limitation by Sponsor	[5]	(35,309)
Total expenses	[5]	116,520
Net investment income (loss)	[5],[7]	(110,590)
Net realized gain (loss) on
Net realized gain (loss)	[5]	(7,046,628)
Change in net unrealized appreciation/depreciation on
Futures contracts	[5]	(2,988,155)
Change in net unrealized appreciation/depreciation	[5]	(2,988,155)
Net realized and unrealized gain (loss)	[5]	(10,034,783)
Net income (loss)	[5],[6],[7]	(10,145,373)
Pro Shares UltraPro 3X Short Crude Oil ETF [Member] | Futures Contracts [Member]
Net realized gain (loss) on
Gain (loss) on sale of derivatives	[5]	(7,046,628)
ProShares VIX Short-Term Futures ETF [Member]
Investment Income
Interest		1,238,374		466,392		42,319
Expenses
Management fee		1,353,339		1,632,880		1,062,171
Brokerage commissions		174,838		270,159		130,942
Brokerage fees		3,383
Total expenses		1,531,560		1,903,039		1,193,113
Net investment income (loss)		(293,186)		(1,436,647)		(1,150,794)
Net realized gain (loss) on
Short-term U.S. government and agency obligations		(772)		6,650		1,703
Net realized gain (loss)		(194,006,340)		(195,469,141)		(19,406,840)
Change in net unrealized appreciation/depreciation on
Futures contracts		(4,293,225)		609,973		(7,343,245)
Short-term U.S. government and agency obligations		(11,354)		3,010		(3,657)
Change in net unrealized appreciation/depreciation		(4,304,579)		612,983		(7,346,902)
Net realized and unrealized gain (loss)		(198,310,919)		(194,856,158)		(26,753,742)
Net income (loss)		(198,604,105)		(196,292,805)		(27,904,536)
ProShares VIX Short-Term Futures ETF [Member] | Futures Contracts [Member]
Net realized gain (loss) on
Gain (loss) on sale of derivatives		$ (194,005,568)		$ (195,475,791)		$ (19,408,543)
[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).
[2]	The operations include the activity of: ProShares Managed Futures Strategy through March 30, 2016, ProShares UltraShort Bloomberg Commodity and ProShares Ultra Bloomberg Commodity through September 1, 2016, the date of liquidation, respectively.
[3]	The operations include the activity of ProShares Ultra Australian Dollar through June 29, 2015, the date of liquidation.
[4]	The operations include the activity of: ProShares Managed Futures Strategy through March 30, 2016 and ProShares UltraShort Bloomberg Commodity and ProShares Ultra Bloomberg Commodity through September 1, 2016, the date of liquidation, respectively.
[5]	Since the Fund's inception date was January 13, 2017, the Statements of Operations for the years ended December 31, 2016 and December 31, 2015 have not been provided.
[6]	Since the Fund's inception date was January 13, 2017, the Statements of Cash Flows for the years ended December 31, 2016 and December 31, 2015 have not been provided.
[7]	Since the Fund's inception date was January 13, 2017, the Statements of Changes in Shareholders' Equity for the years ended December 31, 2016 and December 31, 2015 have not been provided.

Statements of Changes in Shareh

Statements of Changes in Shareholders' Equity - USD ($)	Total		ProShares Short Euro [Member]	ProShares Short VIX Short-Term Futures ETF [Member]	ProShares Ultra Bloomberg Crude Oil [Member]	ProShares Ultra Bloomberg Natural Gas [Member]	ProShares Ultra Euro [Member]	ProShares Ultra Gold [Member]	ProShares Ultra Silver [Member]	ProShares Ultra VIX Short-Term Futures ETF [Member]	ProShares Ultra Yen [Member]	ProShares UltraPro 3x Crude Oil ETF [Member]	[5]	Pro Shares UltraPro 3X Short Crude Oil ETF [Member]	[5]	ProShares UltraShort Australian Dollar [Member]	ProShares UltraShort Bloomberg Crude Oil [Member]	ProShares UltraShort Bloomberg Natural Gas [Member]	ProShares UltraShort Euro [Member]	ProShares UltraShort Gold [Member]	ProShares UltraShort Silver [Member]	ProShares UltraShort Yen [Member]	ProShares VIX Mid-Term Futures ETF [Member]	ProShares VIX Short-Term Futures ETF [Member]
Shareholders' equity, beginning of period at Dec. 31, 2014	$ 3,332,060,486	[1]	$ 14,021,804	$ 506,556,124	$ 450,562,988	$ 70,433,207	$ 2,981,441	$ 102,003,345	$ 291,169,743	$ 351,789,953	$ 2,118,028					$ 23,120,790	$ 169,210,110	$ 14,688,564	$ 517,191,349	$ 81,861,762	$ 53,007,867	$ 531,471,873	$ 21,459,575	$ 111,459,325
Addition of shares	8,943,932,891	[1]	23,563,492	1,403,231,166	2,505,616,928	83,526,876	15,916,613	5,401,300	96,078,803	3,192,766,319	4,285,016					2,764,167	796,070,368	37,204,187	328,253,174	13,383,255	84,272,164	124,524,909	19,318,111	187,659,682
Redemption of shares	(7,525,116,193)	[1]	(21,313,217)	(1,358,113,886)	(1,300,173,042)	(54,776,954)	(6,661,858)	(13,827,755)	(79,831,719)	(2,569,549,298)	(688,682)					(8,380,675)	(924,949,248)	(50,053,143)	(404,314,387)	(36,377,117)	(95,719,329)	(411,459,070)	(8,946,515)	(165,941,648)
Net addition (redemption) of shares	1,418,816,698	[1]	2,250,275	45,117,280	1,205,443,886	28,749,922	9,254,755	(8,426,455)	16,247,084	623,217,021	3,596,334					(5,616,508)	(128,878,880)	(12,848,956)	(76,061,213)	(22,993,862)	(11,447,165)	(286,934,161)	10,371,596	21,718,034
Net investment income (loss)	(40,036,826)	[1]	(178,761)	(5,798,200)	(8,473,155)	(761,335)	(104,071)	(796,424)	(2,507,859)	(7,410,148)	(44,423)					(209,987)	(2,166,211)	(177,124)	(5,000,587)	(703,582)	(516,464)	(3,623,678)	(240,600)	(1,150,794)
Net realized gain (loss)	(1,164,531,561)	[1]	1,559,643	69,828,657	(896,154,368)	(100,772,476)	(1,982,317)	(18,606,208)	(78,309,750)	(392,223,946)	(472,907)					4,330,688	91,684,782	15,212,833	131,674,081	12,708,936	10,756,758	8,806,429	(3,334,581)	(19,406,840)
Change in net unrealized appreciation/depreciation	(39,700,049)	[1]	(142,063)	27,107,500	32,543,124	41,201,866	707,922	(4,309,443)	(10,182,576)	(27,664,140)	276,816					(1,164,304)	(33,951,907)	(6,412,461)	(45,497,112)	4,098,510	4,186,942	(12,347,563)	(605,352)	(7,346,902)
Net income (loss)	(1,244,268,436)	[1]	1,238,819	91,137,957	(872,084,399)	(60,331,945)	(1,378,466)	(23,712,075)	(91,000,185)	(427,298,234)	(240,514)					2,956,397	55,566,664	8,623,248	81,176,382	16,103,864	14,427,236	(7,164,812)	(4,180,533)	(27,904,536)
Shareholders' equity, end of period at Dec. 31, 2015	3,506,608,748	[1],[2]	17,510,898	642,811,361	783,922,475	38,851,184	10,857,730	69,864,815	216,416,642	547,708,740	5,473,848					20,460,679	95,897,894	10,462,856	522,306,518	74,971,764	55,987,938	237,372,900	27,650,638	105,272,823
Addition of shares	10,633,008,985	[2]	2,109,382	2,867,628,691	1,094,604,444	40,783,818	4,628,749	41,599,776	104,165,405	4,540,375,465							1,002,034,810	40,020,426	15,418,329	83,353,994	69,113,968	150,763,218	55,230,587	515,131,303
Redemption of shares	(9,667,529,469)	[2]	(4,280,745)	(3,696,284,684)	(1,163,214,447)	(49,841,263)	(2,458,060)	(22,303,538)	(106,536,792)	(2,976,168,388)	(199)					(2,517,734)	(805,300,056)	(48,901,060)	(204,742,206)	(83,209,971)	(80,899,441)	(118,175,844)	(24,737,849)	(249,951,175)
Net addition (redemption) of shares	965,479,516	[2]	(2,171,363)	(828,655,993)	(68,610,003)	(9,057,445)	2,170,689	19,296,238	(2,371,387)	1,564,207,077	(199)					(2,517,734)	196,734,754	(8,880,634)	(189,323,877)	144,023	(11,785,473)	32,587,374	30,492,738	265,180,128
Net investment income (loss)	(33,017,182)	[2]	(122,728)	(5,396,850)	(6,631,380)	(384,486)	(74,522)	(650,951)	(2,179,392)	(8,936,777)	(45,847)					(145,652)	(1,408,964)	(122,172)	(2,764,657)	(461,423)	(255,853)	(1,609,562)	(294,491)	(1,436,647)
Net realized gain (loss)	(1,320,602,359)	[2]	663,807	440,379,719	74,043,666	17,571,111	139,113	5,815,759	62,342,586	(1,567,324,739)	717,052					(2,786,709)	(67,756,228)	589,999	(25,711,276)	(12,241,129)	(17,556,630)	(22,226,181)	(11,085,007)	(195,469,141)
Change in net unrealized appreciation/depreciation	157,868,764	[2]	(110,526)	(21,062,850)	151,007,102	(3,776,978)	(1,178,425)	(2,198,661)	1,571,491	(19,895,547)	(603,897)					1,602,889	(22,509,153)	1,988,745	44,885,942	1,240,412	(3,372,326)	30,657,216	(944,964)	612,983
Net income (loss)	(1,195,750,777)	[2],[3]	430,553	413,920,019	218,419,388	13,409,647	(1,113,834)	2,966,147	61,734,685	(1,596,157,063)	67,308					(1,329,472)	(91,674,345)	2,456,572	16,410,009	(11,462,140)	(21,184,809)	6,821,473	(12,324,462)	(196,292,805)
Shareholders' equity, end of period at Dec. 31, 2016	3,276,337,487	[2],[4]	15,770,088	228,075,387	933,731,860	43,203,386	11,914,585	92,127,200	275,779,940	515,758,754	5,540,957	$ 0		$ 0		16,613,473	200,958,303	4,038,794	349,392,650	63,653,647	23,017,656	276,781,747	45,818,914	174,160,146
Addition of shares	9,098,339,966	[4]		3,985,678,031	1,156,816,574	106,004,594	25,220,169	23,949,465	50,514,699	2,602,989,881		40,659,738		38,429,372		4,801,797	510,910,744	23,216,158	54,352,755	26,178,336	26,717,920	76,657,434	26,311,779	318,930,520
Redemption of shares	(8,968,941,107)	[4]	(6,278,641)	(4,362,910,576)	(1,600,112,912)	(49,597,578)	(30,563,382)	(41,813,150)	(78,589,935)	(1,672,541,764)	(2,915,722)	(36,641,353)		(7,122,823)		(4,723,167)	(458,220,621)	(24,444,610)	(138,577,565)	(46,730,672)	(32,912,309)	(198,045,129)	(19,454,197)	(156,745,001)
Net addition (redemption) of shares	129,398,859	[4]	(6,278,641)	(377,232,545)	(443,296,338)	56,407,016	(5,343,213)	(17,863,685)	(28,075,236)	930,448,117	(2,915,722)	4,018,385		31,306,549		78,630	52,690,123	(1,228,452)	(84,224,810)	(20,552,336)	(6,194,389)	(121,387,695)	6,857,582	162,185,519
Net investment income (loss)	(14,430,331)	[4]	(37,627)	(5,373,544)	(1,379,461)	(233,762)	(29,782)	(136,329)	(409,752)	(4,896,061)	(21,882)	(119,518)	[6]	(110,590)	[6]	(46,774)	(355,651)	(54,451)	(396,715)	(60,865)	(36,600)	(355,974)	(81,807)	(293,186)
Net realized gain (loss)	(438,531,686)	[4]	(1,162,371)	897,400,073	22,131,716	(40,794,286)	2,212,226	11,485,101	(31,762,627)	(1,020,772,793)	(46,278)	6,018,618		(7,046,628)		(866,949)	(6,491,508)	4,761,749	(39,695,465)	(6,994,765)	1,152,461	(8,733,473)	(25,320,147)	(194,006,340)
Change in net unrealized appreciation/depreciation	(5,496,117)	[4]	(299,569)	27,294,500	13,257,749	4,686,596	837,700	8,096,461	42,712,371	(26,502,876)	307,194	1,417,998		(2,988,155)		(2,076,278)	(20,957,983)	(614,897)	(22,527,463)	(4,548,271)	(3,132,869)	(15,227,152)	(926,594)	(4,304,579)
Net income (loss)	(458,458,134)	[4]	(1,499,567)	919,321,029	34,010,004	(36,341,452)	3,020,144	19,445,233	10,539,992	(1,052,171,730)	239,034	7,317,098	[6],[7]	(10,145,373)	[6],[7]	(2,990,001)	(27,805,142)	4,092,401	(62,619,643)	(11,603,901)	(2,017,008)	(24,316,599)	(26,328,548)	(198,604,105)
Shareholders' equity, end of period at Dec. 31, 2017	$ 2,947,278,212	[4]	$ 7,991,880	$ 770,163,871	$ 524,445,526	$ 63,268,950	$ 9,591,516	$ 93,708,748	$ 258,244,696	$ 394,035,141	$ 2,864,269	$ 11,335,483	[8]	$ 21,161,176	[8]	$ 13,702,102	$ 225,843,284	$ 6,902,743	$ 202,548,197	$ 31,497,410	$ 14,806,259	$ 131,077,453	$ 26,347,948	$ 137,741,560
[1]	The operations include the activity of ProShares Ultra Australian Dollar through June 29, 2015, the date of liquidation.
[2]	The operations include the activity of: ProShares Managed Futures Strategy through March 30, 2016, ProShares UltraShort Bloomberg Commodity and ProShares Ultra Bloomberg Commodity through September 1, 2016, the date of liquidation, respectively.
[3]	The operations include the activity of: ProShares Managed Futures Strategy through March 30, 2016 and ProShares UltraShort Bloomberg Commodity and ProShares Ultra Bloomberg Commodity through September 1, 2016, the date of liquidation, respectively.
[4]	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).
[5]	Since the Fund's inception date was January 13, 2017, the Statements of Changes in Shareholders' Equity for the years ended December 31, 2016 and December 31, 2015 have not been provided.
[6]	Since the Fund's inception date was January 13, 2017, the Statements of Operations for the years ended December 31, 2016 and December 31, 2015 have not been provided.
[7]	Since the Fund's inception date was January 13, 2017, the Statements of Cash Flows for the years ended December 31, 2016 and December 31, 2015 have not been provided.
[8]	Since the Fund's inception date was January 13, 2017, the Statement of Financial Condition as of December 31, 2016 has not been provided.

Statements of Changes in Share6

Statements of Changes in Shareholders' Equity (Parenthetical) - shares		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Addition, shares		255,585,016	[1]	213,130,750	[2]	139,373,050	[3]
Redemption, shares		227,526,807	[1]	221,560,666	[2]	111,513,687	[3]
Net addition (redemption), shares		28,058,209	[1]	(8,429,916)	[2]	27,859,363	[3]
ProShares Short Euro [Member]
Addition, shares		0		50,000		550,000
Redemption, shares		150,000		100,005		500,000
Net addition (redemption), shares		(150,000)		(50,005)		50,000
ProShares Short VIX Short-Term Futures ETF [Member]
Addition, shares		52,550,000		105,900,000		48,200,000
Redemption, shares		51,500,000		126,200,080		39,400,000
Net addition (redemption), shares		1,050,000		(20,300,080)		8,800,000
ProShares Ultra Bloomberg Crude Oil [Member]
Addition, shares		68,500,000		62,875,000		43,415,000
Redemption, shares		86,352,616		54,025,001		16,690,983
Net addition (redemption), shares		(17,852,616)		8,849,999		26,724,017
ProShares Ultra Bloomberg Natural Gas [Member]
Addition, shares		12,550,000		3,450,000		2,137,500
Redemption, shares		5,150,000		3,250,001		1,187,815
Net addition (redemption), shares		7,400,000		199,999		949,685
ProShares Ultra Euro [Member]
Addition, shares		1,600,000		300,000		950,000
Redemption, shares		1,900,000		150,014		400,000
Net addition (redemption), shares		(300,000)		149,986		550,000
ProShares Ultra Gold [Member]
Addition, shares		650,000		1,050,000		150,000
Redemption, shares		1,100,000		600,014		350,000
Net addition (redemption), shares		(450,000)		449,986		(200,000)
ProShares Ultra Silver [Member]
Addition, shares		1,550,000		2,800,000		2,700,000
Redemption, shares		2,100,000		2,550,007		2,100,000
Net addition (redemption), shares		(550,000)		249,993		600,000
ProShares Ultra VIX Short-Term Futures ETF [Member]
Addition, shares		85,585,000		7,239,500		721,800
Redemption, shares		50,423,145		4,469,142		554,815
Net addition (redemption), shares		35,161,855		2,770,358		166,985
ProShares Ultra Yen [Member]
Addition, shares		0		0		75,000
Redemption, shares		50,000		4		12,530
Net addition (redemption), shares		(50,000)		(4)		62,470
ProShares UltraPro 3x Crude Oil ETF [Member]
Addition, shares	[4]	1,750,008
Redemption, shares	[4]	1,450,000
Net addition (redemption), shares	[4]	300,008
Pro Shares UltraPro 3X Short Crude Oil ETF [Member]
Addition, shares	[4]	2,300,008
Redemption, shares	[4]	300,000
Net addition (redemption), shares	[4]	2,000,008
ProShares UltraShort Australian Dollar [Member]
Addition, shares		100,000		0		50,000
Redemption, shares		100,000		50,005		150,000
Net addition (redemption), shares		0		(50,005)		(100,000)
ProShares UltraShort Bloomberg Crude Oil [Member]
Addition, shares		14,500,000		18,500,000		21,600,000
Redemption, shares		11,550,000		13,600,004		24,500,000
Net addition (redemption), shares		2,950,000		4,899,996		(2,900,000)
ProShares UltraShort Bloomberg Natural Gas [Member]
Addition, shares		650,000		950,000		1,350,000
Redemption, shares		650,000		1,000,024		1,650,000
Net addition (redemption), shares		0		(50,024)		(300,000)
ProShares UltraShort Euro [Member]
Addition, shares		2,400,000		650,000		12,600,000
Redemption, shares		5,750,000		8,200,014		16,100,000
Net addition (redemption), shares		(3,350,000)		(7,550,014)		(3,500,000)
ProShares UltraShort Gold [Member]
Addition, shares		350,000		1,050,000		150,000
Redemption, shares		600,000		1,000,000		350,000
Net addition (redemption), shares		(250,000)		50,000		(200,000)
ProShares UltraShort Silver [Member]
Addition, shares		850,000		1,650,000		1,650,000
Redemption, shares		1,000,000		1,900,002		1,700,000
Net addition (redemption), shares		(150,000)		(250,002)		(50,000)
ProShares UltraShort Yen [Member]
Addition, shares		1,000,000		2,300,000		1,350,000
Redemption, shares		2,700,000		1,550,004		4,600,000
Net addition (redemption), shares		(1,700,000)		749,996		(3,250,000)
ProShares VIX Mid-Term Futures ETF [Member]
Addition, shares		950,000		1,100,000		325,000
Redemption, shares		800,000		525,001		150,000
Net addition (redemption), shares		150,000		574,999		175,000
ProShares VIX Short-Term Futures ETF [Member]
Addition, shares		7,750,000		3,066,250		623,750
Redemption, shares		3,901,046		1,411,378		492,500
Net addition (redemption), shares		3,848,954		1,654,872		131,250
[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).
[2]	The operations include the activity of: ProShares Managed Futures Strategy through March 30, 2016, ProShares UltraShort Bloomberg Commodity and ProShares Ultra Bloomberg Commodity through September 1, 2016, the date of liquidation, respectively.
[3]	The operations include the activity of ProShares Ultra Australian Dollar through June 29, 2015, the date of liquidation.
[4]	Since the Fund's inception date was January 13, 2017, the Statements of Changes in Shareholders' Equity for the years ended December 31, 2016 and December 31, 2015 have not been provided.

Statements of Cash Flows

Statements of Cash Flows - USD ($)		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Cash flow from operating activities
Net income (loss)		$ (458,458,134)	[1]	$ (1,195,750,777)	[2],[3]	$ (1,244,268,436)	[4]
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Decrease (Increase) in segregated cash balances with brokers for futures contracts		(239,805,149)	[1]	80,870,728	[2]	35,477,903	[4]
Decrease (Increase) in segregated cash balances with brokers for forward agreements	[1]	(4,081,500)
Decrease (Increase) in segregated cash balances with brokers for foreign currency forward contracts	[1]	(3,960,000)
Purchases of short-term U.S. government and agency obligations		(31,621,104,918)	[1]	(18,373,450,463)	[2]	(17,070,603,480)	[4]
Proceeds from sales or maturities of short-term U.S government and agency obligations		32,238,762,028	[1]	18,657,310,693	[2]	16,764,420,326	[4]
Net amortization and accretion on short-term U.S government and agency obligations		(24,840,586)	[1]	(9,128,007)	[2]	(1,530,269)	[4]
Net realized gain (loss) on investments		50,042	[1]	15,768	[2]	(47,732)	[4]
Change in unrealized appreciation/depreciation on investments		5,135,182	[1]	(179,899,377)	[2]	79,893,405	[4]
Decrease (Increase) in receivable on futures contracts		(3,368,120)	[1]	(14,207,535)	[2]	28,346,999	[4]
Decrease (Increase) in Limitation by Sponsor		(59,651)	[1]			9,474	[4]
Change in offering cost	[4]					49,384
Cash paid for offering cost	[1]	(343,794)
Amortization of offering cost		238,151	[1]			59,479	[4]
Increase (Decrease) in payable to Sponsor		(213,033)	[1]	(116,609)	[2]	181,800	[4]
Increase (Decrease) in brokerage commissions and fees payable		(2,909)	[1]	(36,239)	[2]	39,148	[4]
Increase (Decrease) in payable on futures contracts		(2,017,981)	[1]	894,352	[2]	(43,327,729)	[4]
Increase (Decrease) in payable for offering costs	[4]					(65,785)
Net cash provided by (used in) operating activities		(114,070,372)	[1]	(1,033,497,466)	[2]	(1,451,424,992)	[4]
Cash flow from financing activities
Proceeds from addition of shares		9,097,496,596	[1]	10,681,055,123	[2]	8,953,972,200	[4]
Payment on shares redeemed		(8,967,195,585)	[1]	(9,656,124,409)	[2]	(7,490,397,088)	[4]
Net cash provided by (used in) financing activities		130,301,011	[1]	1,024,930,714	[2]	1,463,575,112	[4]
Net increase (decrease) in cash		16,230,639	[1]	(8,566,752)	[2]	12,150,120	[4]
Cash, beginning of period		39,482,599	[1],[2]	48,049,351	[2],[4]	35,899,231	[4]
Cash, end of period		55,713,238	[1]	39,482,599	[1],[2]	48,049,351	[2],[4]
ProShares Short Euro [Member]
Cash flow from operating activities
Net income (loss)		(1,499,567)		430,553		1,238,819
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Decrease (Increase) in segregated cash balances with brokers for futures contracts		280,170		101,145		(260,865)
Purchases of short-term U.S. government and agency obligations		(52,920,382)		(53,315,548)		(56,503,913)
Proceeds from sales or maturities of short-term U.S government and agency obligations		59,163,769		55,336,935		53,441,831
Net amortization and accretion on short-term U.S government and agency obligations		(75,559)		(32,959)		(4,504)
Net realized gain (loss) on investments		384		(33)		(218)
Change in unrealized appreciation/depreciation on investments		381		(12)		170
Decrease (Increase) in receivable on futures contracts				84,235		(20,985)
Increase (Decrease) in payable to Sponsor		(6,149)		(1,409)		2,967
Increase (Decrease) in payable on futures contracts		(33,355)		76,666
Net cash provided by (used in) operating activities		4,909,692		2,679,573		(2,106,698)
Cash flow from financing activities
Proceeds from addition of shares				2,109,382		23,563,492
Payment on shares redeemed		(6,278,641)		(4,280,745)		(21,313,217)
Net cash provided by (used in) financing activities		(6,278,641)		(2,171,363)		2,250,275
Net increase (decrease) in cash		(1,368,949)		508,210		143,577
Cash, beginning of period		2,292,012		1,783,802		1,640,225
Cash, end of period		923,063		2,292,012		1,783,802
ProShares Short VIX Short-Term Futures ETF [Member]
Cash flow from operating activities
Net income (loss)		919,321,029		413,920,019		91,137,957
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Decrease (Increase) in segregated cash balances with brokers for futures contracts		(243,876,292)		68,204,421		(38,283,455)
Purchases of short-term U.S. government and agency obligations		(7,250,717,757)		(2,915,165,614)		(2,104,319,382)
Proceeds from sales or maturities of short-term U.S government and agency obligations		6,931,640,345		3,281,269,459		2,016,127,119
Net amortization and accretion on short-term U.S government and agency obligations		(5,493,799)		(1,126,057)		(180,670)
Net realized gain (loss) on investments		443		11,670		(35,629)
Change in unrealized appreciation/depreciation on investments		56,560		6,824		(8,936)
Decrease (Increase) in receivable on futures contracts		(19,699,432)		(1,059,418)
Increase (Decrease) in payable to Sponsor		597,228		(277,306)		100,052
Increase (Decrease) in payable on futures contracts		203,750		(1,095,271)		(29,599,748)
Net cash provided by (used in) operating activities		332,032,075		844,688,727		(65,062,692)
Cash flow from financing activities
Proceeds from addition of shares		3,985,678,031		2,877,792,848		1,393,067,009
Payment on shares redeemed		(4,318,092,866)		(3,725,781,791)		(1,331,975,560)
Net cash provided by (used in) financing activities		(332,414,835)		(847,988,943)		61,091,449
Net increase (decrease) in cash		(382,760)		(3,300,216)		(3,971,243)
Cash, beginning of period		1,850,760		5,150,976		9,122,219
Cash, end of period		1,468,000		1,850,760		5,150,976
ProShares Ultra Bloomberg Crude Oil [Member]
Cash flow from operating activities
Net income (loss)		34,010,004		218,419,388		(872,084,399)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Decrease (Increase) in segregated cash balances with brokers for futures contracts		11,812,845		26,962,210		(12,966,690)
Purchases of short-term U.S. government and agency obligations		(6,401,999,444)		(3,746,504,691)		(4,300,690,737)
Proceeds from sales or maturities of short-term U.S government and agency obligations		6,833,376,973		3,661,263,949		3,970,639,458
Net amortization and accretion on short-term U.S government and agency obligations		(5,888,775)		(2,170,633)		(382,657)
Net realized gain (loss) on investments		14,496		17,374		(22,728)
Change in unrealized appreciation/depreciation on investments		(6,848,935)		(127,540,623)		(3,997,651)
Decrease (Increase) in receivable on futures contracts		(2,242,001)		5,150,763		(5,150,763)
Increase (Decrease) in payable to Sponsor		(397,278)		176,115		316,922
Increase (Decrease) in brokerage commissions and fees payable		(2,332)		(22,668)		25,000
Increase (Decrease) in payable on futures contracts		(1,993,438)		1,993,438		(5,817,266)
Net cash provided by (used in) operating activities		459,842,115		37,744,622		(1,230,131,511)
Cash flow from financing activities
Proceeds from addition of shares		1,156,816,574		1,099,498,953		2,529,448,592
Payment on shares redeemed		(1,616,527,496)		(1,139,850,399)		(1,297,658,086)
Net cash provided by (used in) financing activities		(459,710,922)		(40,351,446)		1,231,790,506
Net increase (decrease) in cash		131,193		(2,606,824)		1,658,995
Cash, beginning of period		1,401,555		4,008,379		2,349,384
Cash, end of period		1,532,748		1,401,555		4,008,379
ProShares Ultra Euro [Member]
Cash flow from operating activities
Net income (loss)		3,020,144		(1,113,834)		(1,378,466)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Decrease (Increase) in segregated cash balances with brokers for foreign currency forward contracts		(922,000)
Purchases of short-term U.S. government and agency obligations		(57,793,329)		(48,066,675)		(42,137,395)
Proceeds from sales or maturities of short-term U.S government and agency obligations		62,783,137		47,805,780		32,950,150
Net amortization and accretion on short-term U.S government and agency obligations		(94,761)		(25,015)		(2,797)
Net realized gain (loss) on investments		87		(154)		109
Change in unrealized appreciation/depreciation on investments		(837,700)		1,178,425		(707,922)
Increase (Decrease) in payable to Sponsor		(2,331)		(415)		8,041
Net cash provided by (used in) operating activities		6,153,247		(221,888)		(11,268,280)
Cash flow from financing activities
Proceeds from addition of shares		25,220,169		4,628,749		15,916,613
Payment on shares redeemed		(30,563,382)		(4,027,778)		(5,092,140)
Net cash provided by (used in) financing activities		(5,343,213)		600,971		10,824,473
Net increase (decrease) in cash		810,034		379,083		(443,807)
Cash, beginning of period		606,393		227,310		671,117
Cash, end of period		1,416,427		606,393		227,310
ProShares Ultra Gold [Member]
Cash flow from operating activities
Net income (loss)		19,445,233		2,966,147		(23,712,075)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Decrease (Increase) in segregated cash balances with brokers for futures contracts		4,400		(4,950)		550
Purchases of short-term U.S. government and agency obligations		(909,157,323)		(406,481,915)		(260,988,119)
Proceeds from sales or maturities of short-term U.S government and agency obligations		916,390,856		383,282,007		291,047,782
Net amortization and accretion on short-term U.S government and agency obligations		(766,506)		(249,321)		(42,700)
Net realized gain (loss) on investments		(691)		806		393
Change in unrealized appreciation/depreciation on investments		(8,072,021)		2,184,901		4,299,663
Decrease (Increase) in receivable on futures contracts		(2,420)		80		(80)
Increase (Decrease) in payable to Sponsor		(1,811)		15,554		(28,602)
Increase (Decrease) in payable on futures contracts		(1,280)		1,280		(3,260)
Net cash provided by (used in) operating activities		17,838,437		(18,285,411)		10,573,552
Cash flow from financing activities
Proceeds from addition of shares		23,949,465		41,599,776		5,401,300
Payment on shares redeemed		(41,813,150)		(22,303,538)		(15,827,473)
Net cash provided by (used in) financing activities		(17,863,685)		19,296,238		(10,426,173)
Net increase (decrease) in cash		(25,248)		1,010,827		147,379
Cash, beginning of period		1,262,351		251,524		104,145
Cash, end of period		1,237,103		1,262,351		251,524
ProShares Ultra Silver [Member]
Cash flow from operating activities
Net income (loss)		10,539,992		61,734,685		(91,000,185)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Decrease (Increase) in segregated cash balances with brokers for futures contracts		3,960		2,860		(2,860)
Decrease (Increase) in segregated cash balances with brokers for forward agreements		(3,343,000)		0		0
Purchases of short-term U.S. government and agency obligations		(2,227,503,877)		(1,412,194,485)		(835,846,036)
Proceeds from sales or maturities of short-term U.S government and agency obligations		2,289,337,181		1,356,640,583		902,567,408
Net amortization and accretion on short-term U.S government and agency obligations		(2,142,126)		(842,217)		(156,353)
Net realized gain (loss) on investments		(207)		(145)		441
Change in unrealized appreciation/depreciation on investments		(42,683,411)		(1,589,821)		10,175,106
Decrease (Increase) in receivable on futures contracts		(2,220)		0		0
Increase (Decrease) in payable to Sponsor		(34,624)		40,213		(72,982)
Increase (Decrease) in payable on futures contracts		(2,290)		415		(4,895)
Net cash provided by (used in) operating activities		24,169,378		3,792,088		(14,340,356)
Cash flow from financing activities
Proceeds from addition of shares		50,514,699		104,165,405		96,078,803
Payment on shares redeemed		(75,235,084)		(106,536,792)		(81,799,551)
Net cash provided by (used in) financing activities		(24,720,385)		(2,371,387)		14,279,252
Net increase (decrease) in cash		(551,007)		1,420,701		(61,104)
Cash, beginning of period		1,664,601		243,900		305,004
Cash, end of period		1,113,594		1,664,601		243,900
ProShares Ultra VIX Short-Term Futures ETF [Member]
Cash flow from operating activities
Net income (loss)		(1,052,171,730)		(1,596,157,063)		(427,298,234)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Decrease (Increase) in segregated cash balances with brokers for futures contracts		(15,848,058)		(9,015,025)		54,559,100
Purchases of short-term U.S. government and agency obligations		(4,416,383,420)		(4,242,730,514)		(3,411,109,730)
Proceeds from sales or maturities of short-term U.S government and agency obligations		4,566,387,313		4,248,037,733		3,155,524,185
Net amortization and accretion on short-term U.S government and agency obligations		(2,896,165)		(1,634,060)		(156,187)
Net realized gain (loss) on investments		21,942		(15,949)		49,718
Change in unrealized appreciation/depreciation on investments		8,993		28,844		(26,647)
Decrease (Increase) in receivable on futures contracts		18,388,740		(17,971,713)		24,535,963
Increase (Decrease) in payable to Sponsor		(79,981)		(3,115)		124,528
Net cash provided by (used in) operating activities		(902,572,366)		(1,619,460,862)		(603,797,304)
Cash flow from financing activities
Proceeds from addition of shares		2,602,472,951		4,573,362,937		3,172,328,095
Payment on shares redeemed		(1,709,331,303)		(2,952,014,084)		(2,563,186,119)
Net cash provided by (used in) financing activities		893,141,648		1,621,348,853		609,141,976
Net increase (decrease) in cash		(9,430,718)		1,887,991		5,344,672
Cash, beginning of period		10,969,955		9,081,964		3,737,292
Cash, end of period		1,539,237		10,969,955		9,081,964
ProShares Ultra Yen [Member]
Cash flow from operating activities
Net income (loss)		239,034		67,308		(240,514)
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		(16,968,159)		(28,924,289)		(12,557,564)
Proceeds from sales or maturities of short-term U.S government and agency obligations		20,281,603		28,727,215		8,779,817
Net amortization and accretion on short-term U.S government and agency obligations		(28,639)		(16,858)		(3,609)
Net realized gain (loss) on investments		83		34		(6)
Change in unrealized appreciation/depreciation on investments		(307,194)		603,897		(276,816)
Increase (Decrease) in payable to Sponsor		(2,225)		212		2,810
Net cash provided by (used in) operating activities		3,214,503		457,519		(4,295,882)
Cash flow from financing activities
Proceeds from addition of shares						4,285,016
Payment on shares redeemed		(2,915,722)		(199)		(688,682)
Net cash provided by (used in) financing activities		(2,915,722)		(199)		3,596,334
Net increase (decrease) in cash		298,781		457,320		(699,548)
Cash, beginning of period		604,691		147,371		846,919
Cash, end of period		903,472		604,691		147,371
ProShares UltraShort Australian Dollar [Member]
Cash flow from operating activities
Net income (loss)		(2,990,001)		(1,329,472)		2,956,397
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Decrease (Increase) in segregated cash balances with brokers for futures contracts		429,385		(857,695)		963,152
Purchases of short-term U.S. government and agency obligations		(88,399,815)		(51,162,005)		(61,647,966)
Proceeds from sales or maturities of short-term U.S government and agency obligations		89,408,839		56,705,513		63,512,421
Net amortization and accretion on short-term U.S government and agency obligations		(84,205)		(43,459)		(5,998)
Net realized gain (loss) on investments		178		(495)		(225)
Change in unrealized appreciation/depreciation on investments		718		(279)		553
Decrease (Increase) in receivable on futures contracts				52,491		10,043
Increase (Decrease) in payable to Sponsor		(1,706)		(3,812)		(1,630)
Increase (Decrease) in payable on futures contracts		20,610		32,340
Net cash provided by (used in) operating activities		(1,615,997)		3,393,127		5,786,747
Cash flow from financing activities
Proceeds from addition of shares		4,801,797				2,764,167
Payment on shares redeemed		(4,723,167)		(2,517,734)		(8,380,675)
Net cash provided by (used in) financing activities		78,630		(2,517,734)		(5,616,508)
Net increase (decrease) in cash		(1,537,367)		875,393		170,239
Cash, beginning of period		2,834,389		1,958,996		1,788,757
Cash, end of period		1,297,022		2,834,389		1,958,996
ProShares UltraShort Bloomberg Crude Oil [Member]
Cash flow from operating activities
Net income (loss)		(27,805,142)		(91,674,345)		55,566,664
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Decrease (Increase) in segregated cash balances with brokers for futures contracts		2,363,707		5,222,910		2,138,235
Purchases of short-term U.S. government and agency obligations		(2,520,968,339)		(1,099,847,442)		(1,238,357,695)
Proceeds from sales or maturities of short-term U.S government and agency obligations		2,474,635,036		974,343,507		1,290,330,607
Net amortization and accretion on short-term U.S government and agency obligations		(1,641,472)		(500,160)		(60,884)
Net realized gain (loss) on investments		448		4,064		(14,458)
Change in unrealized appreciation/depreciation on investments		18,422,150		18,617,825		20,609,817
Decrease (Increase) in receivable on futures contracts						1,293,531
Increase (Decrease) in payable to Sponsor		27,810		61,748		(27,242)
Increase (Decrease) in brokerage commissions and fees payable				(8,453)		8,453
Increase (Decrease) in payable on futures contracts		680,185		(837,281)		850,883
Net cash provided by (used in) operating activities		(54,285,617)		(194,617,627)		132,337,911
Cash flow from financing activities
Proceeds from addition of shares		510,910,744		1,002,034,810		796,070,368
Payment on shares redeemed		(458,220,621)		(805,300,056)		(928,803,902)
Net cash provided by (used in) financing activities		52,690,123		196,734,754		(132,733,534)
Net increase (decrease) in cash		(1,595,494)		2,117,127		(395,623)
Cash, beginning of period		2,715,772		598,645		994,268
Cash, end of period		1,120,278		2,715,772		598,645
ProShares UltraShort Bloomberg Natural Gas [Member]
Cash flow from operating activities
Net income (loss)		4,092,401		2,456,572		8,623,248
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Decrease (Increase) in segregated cash balances with brokers for futures contracts		(412,720)		1,336,005		2,359,170
Purchases of short-term U.S. government and agency obligations		(98,949,414)		(46,397,398)		(59,678,558)
Proceeds from sales or maturities of short-term U.S government and agency obligations		97,881,796		51,635,055		60,242,291
Net amortization and accretion on short-term U.S government and agency obligations		(33,644)		(19,053)		(5,830)
Net realized gain (loss) on investments		783		(3,139)		(29)
Change in unrealized appreciation/depreciation on investments		(121)		388		(168)
Decrease (Increase) in receivable on futures contracts		105,872		(105,872)		923,531
Increase (Decrease) in payable to Sponsor		(261)		(7,499)		620
Increase (Decrease) in brokerage commissions and fees payable		(144)		(1,764)		1,908
Increase (Decrease) in payable on futures contracts		104,104		(785,170)		785,170
Net cash provided by (used in) operating activities		2,788,652		8,108,125		13,251,353
Cash flow from financing activities
Proceeds from addition of shares		23,216,158		40,020,426		37,204,187
Payment on shares redeemed		(24,444,610)		(48,901,060)		(50,053,143)
Net cash provided by (used in) financing activities		(1,228,452)		(8,880,634)		(12,848,956)
Net increase (decrease) in cash		1,560,200		(772,509)		402,397
Cash, beginning of period		326,631		1,099,140		696,743
Cash, end of period		1,886,831		326,631		1,099,140
ProShares UltraShort Euro [Member]
Cash flow from operating activities
Net income (loss)		(62,619,643)		16,410,009		81,176,382
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Decrease (Increase) in segregated cash balances with brokers for foreign currency forward contracts		(3,038,000)
Purchases of short-term U.S. government and agency obligations		(2,213,830,667)		(1,535,809,146)		(1,901,774,819)
Proceeds from sales or maturities of short-term U.S government and agency obligations		2,348,460,695		1,745,625,938		1,842,981,707
Net amortization and accretion on short-term U.S government and agency obligations		(2,048,455)		(1,012,886)		(263,820)
Net realized gain (loss) on investments		3,785		(242)		(22,509)
Change in unrealized appreciation/depreciation on investments		22,527,463		(44,885,942)		45,497,112
Increase (Decrease) in payable to Sponsor		(119,503)		(123,177)		28,455
Net cash provided by (used in) operating activities		89,335,675		180,204,554		67,622,508
Cash flow from financing activities
Proceeds from addition of shares		54,352,755		15,418,329		341,209,778
Payment on shares redeemed		(145,349,037)		(203,078,964)		(399,206,157)
Net cash provided by (used in) financing activities		(90,996,282)		(187,660,635)		(57,996,379)
Net increase (decrease) in cash		(1,660,607)		(7,456,081)		9,626,129
Cash, beginning of period		2,916,502		10,372,583		746,454
Cash, end of period		1,255,895		2,916,502		10,372,583
ProShares UltraShort Gold [Member]
Cash flow from operating activities
Net income (loss)		(11,603,901)		(11,462,140)		16,103,864
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Decrease (Increase) in segregated cash balances with brokers for futures contracts		4,400		78,050		(82,450)
Purchases of short-term U.S. government and agency obligations		(259,713,980)		(320,273,448)		(254,497,395)
Proceeds from sales or maturities of short-term U.S government and agency obligations		288,557,288		332,879,016		265,587,947
Net amortization and accretion on short-term U.S government and agency obligations		(283,867)		(164,568)		(31,999)
Net realized gain (loss) on investments		1,208		378		(1,301)
Change in unrealized appreciation/depreciation on investments		4,523,831		(1,226,652)		(4,088,770)
Decrease (Increase) in receivable on futures contracts		1,280		(1,280)		3,260
Increase (Decrease) in payable to Sponsor		(30,538)		(4,097)		(10,170)
Increase (Decrease) in payable on futures contracts		2,420		(80)		80
Net cash provided by (used in) operating activities		21,458,141		(174,821)		22,983,066
Cash flow from financing activities
Proceeds from addition of shares		26,178,336		83,353,994		13,383,255
Payment on shares redeemed		(46,730,672)		(83,209,971)		(36,377,117)
Net cash provided by (used in) financing activities		(20,552,336)		144,023		(22,993,862)
Net increase (decrease) in cash		905,805		(30,798)		(10,796)
Cash, beginning of period		120,840		151,638		162,434
Cash, end of period		1,026,645		120,840		151,638
ProShares UltraShort Silver [Member]
Cash flow from operating activities
Net income (loss)		(2,017,008)		(21,184,809)		14,427,236
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Decrease (Increase) in segregated cash balances with brokers for futures contracts		3,960		(2,860)		2,860
Decrease (Increase) in segregated cash balances with brokers for forward agreements		(738,500)
Purchases of short-term U.S. government and agency obligations		(205,796,774)		(149,552,689)		(220,073,123)
Proceeds from sales or maturities of short-term U.S government and agency obligations		209,150,487		178,824,533		221,589,835
Net amortization and accretion on short-term U.S government and agency obligations		(157,687)		(93,482)		(23,831)
Net realized gain (loss) on investments		932		1,916		2,787
Change in unrealized appreciation/depreciation on investments		3,103,909		3,393,666		(4,182,532)
Decrease (Increase) in receivable on futures contracts		2,290		(1,900)		6,380
Increase (Decrease) in payable to Sponsor		(2,464)		(27,635)		4,831
Increase (Decrease) in payable on futures contracts		2,220
Net cash provided by (used in) operating activities		3,551,365		11,356,740		11,754,443
Cash flow from financing activities
Proceeds from addition of shares		26,717,920		69,113,968		84,272,164
Payment on shares redeemed		(29,740,532)		(80,899,441)		(95,719,329)
Net cash provided by (used in) financing activities		(3,022,612)		(11,785,473)		(11,447,165)
Net increase (decrease) in cash		528,753		(428,733)		307,278
Cash, beginning of period		86,051		514,784		207,506
Cash, end of period		614,804		86,051		514,784
ProShares VIX Mid-Term Futures ETF [Member]
Cash flow from operating activities
Net income (loss)		(26,328,548)		(12,324,462)		(4,180,533)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Decrease (Increase) in segregated cash balances with brokers for futures contracts		(3,573,785)		(71,865)		926,200
Purchases of short-term U.S. government and agency obligations		(943,753,668)		(175,738,460)		(95,567,067)
Proceeds from sales or maturities of short-term U.S government and agency obligations		968,489,510		156,335,340		93,706,007
Net amortization and accretion on short-term U.S government and agency obligations		(243,058)		(107,408)		(8,293)
Net realized gain (loss) on investments		377		(499)		(1,355)
Change in unrealized appreciation/depreciation on investments		(441)		1,079		327
Decrease (Increase) in receivable on futures contracts		72,526		(200,353)		1,741,140
Increase (Decrease) in payable to Sponsor		(8,941)		12,194		(2,358)
Net cash provided by (used in) operating activities		(5,346,028)		(32,094,434)		(3,385,932)
Cash flow from financing activities
Proceeds from addition of shares		26,311,779		55,230,587		19,318,111
Payment on shares redeemed		(20,480,908)		(22,652,829)		(16,894,470)
Net cash provided by (used in) financing activities		5,830,871		32,577,758		2,423,641
Net increase (decrease) in cash		484,843		483,324		(962,291)
Cash, beginning of period		1,155,115		671,791		1,634,082
Cash, end of period		1,639,958		1,155,115		671,791
ProShares Ultra Bloomberg Natural Gas [Member]
Cash flow from operating activities
Net income (loss)		(36,341,452)		13,409,647		(60,331,945)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Decrease (Increase) in segregated cash balances with brokers for futures contracts		(2,686,803)		(17,490)		13,538,800
Purchases of short-term U.S. government and agency obligations		(400,640,972)		(136,277,314)		(262,203,648)
Proceeds from sales or maturities of short-term U.S government and agency obligations		386,173,028		126,972,823		288,829,035
Net amortization and accretion on short-term U.S government and agency obligations		(313,279)		(72,943)		(18,846)
Net realized gain (loss) on investments		1,021		698		(4,341)
Change in unrealized appreciation/depreciation on investments		2,494		819		296
Decrease (Increase) in receivable on futures contracts		(1,520,156)		3,065,769		(3,065,769)
Increase (Decrease) in payable to Sponsor		8,069		10,926		(40,680)
Increase (Decrease) in brokerage commissions and fees payable		(433)		(3,190)		3,623
Increase (Decrease) in payable on futures contracts		(1,528,005)		1,528,005		(9,552,314)
Net cash provided by (used in) operating activities		(56,846,488)		8,617,750		(32,845,789)
Cash flow from financing activities
Proceeds from addition of shares		105,678,154		40,783,818		87,380,298
Payment on shares redeemed		(45,385,784)		(49,841,263)		(54,776,954)
Net cash provided by (used in) financing activities		60,292,370		(9,057,445)		32,603,344
Net increase (decrease) in cash		3,445,882		(439,695)		(242,445)
Cash, beginning of period		971,442		1,411,137		1,653,582
Cash, end of period		4,417,324		971,442		1,411,137
ProShares UltraPro 3x Crude Oil ETF [Member]
Cash flow from operating activities
Net income (loss)	[5],[6],[7]	7,317,098
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Decrease (Increase) in segregated cash balances with brokers for futures contracts	[5]	(1,285,048)
Decrease (Increase) in receivable on futures contracts	[5]	(289,395)
Decrease (Increase) in Limitation by Sponsor	[5]	(24,342)
Cash paid for offering cost	[5]	(171,927)
Amortization of offering cost	[5],[7]	119,081
Net cash provided by (used in) operating activities	[5]	5,665,467
Cash flow from financing activities
Proceeds from addition of shares	[5]	40,659,738
Payment on shares redeemed	[5]	(36,641,353)
Net cash provided by (used in) financing activities	[5]	4,018,385
Net increase (decrease) in cash	[5]	9,683,852
Cash, end of period	[5]	9,683,852
Pro Shares UltraPro 3X Short Crude Oil ETF [Member]
Cash flow from operating activities
Net income (loss)	[5],[6],[7]	(10,145,373)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Decrease (Increase) in segregated cash balances with brokers for futures contracts	[5]	(2,396,625)
Decrease (Increase) in Limitation by Sponsor	[5]	(35,309)
Cash paid for offering cost	[5]	(171,867)
Amortization of offering cost	[5],[7]	119,070
Increase (Decrease) in payable on futures contracts	[5]	527,098
Net cash provided by (used in) operating activities	[5]	(12,103,006)
Cash flow from financing activities
Proceeds from addition of shares	[5]	38,429,372
Payment on shares redeemed	[5]	(7,122,823)
Net cash provided by (used in) financing activities	[5]	31,306,549
Net increase (decrease) in cash	[5]	19,203,543
Cash, beginning of period	[5]	0
Cash, end of period	[5]	19,203,543		0
ProShares UltraShort Yen [Member]
Cash flow from operating activities
Net income (loss)		(24,316,599)		6,821,473		(7,164,812)
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		(1,735,928,862)		(1,044,852,917)		(1,322,695,643)
Proceeds from sales or maturities of short-term U.S government and agency obligations		1,862,630,186		1,048,290,293		1,595,758,281
Net amortization and accretion on short-term U.S government and agency obligations		(1,446,842)		(531,771)		(135,814)
Net realized gain (loss) on investments		4,001		5,910		3,035
Change in unrealized appreciation/depreciation on investments		15,227,152		(30,657,216)		12,347,563
Increase (Decrease) in payable to Sponsor		(125,628)		21,603		(228,916)
Net cash provided by (used in) operating activities		116,043,408		(20,902,625)		277,883,694
Cash flow from financing activities
Proceeds from addition of shares		76,657,434		150,763,218		124,524,909
Payment on shares redeemed		(194,285,146)		(126,970,573)		(402,664,341)
Net cash provided by (used in) financing activities		(117,627,712)		23,792,645		(278,139,432)
Net increase (decrease) in cash		(1,584,304)		2,890,020		(255,738)
Cash, beginning of period		3,166,988		276,968		532,706
Cash, end of period		1,582,684		3,166,988		276,968
ProShares VIX Short-Term Futures ETF [Member]
Cash flow from operating activities
Net income (loss)		(198,604,105)		(196,292,805)		(27,904,536)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Decrease (Increase) in segregated cash balances with brokers for futures contracts		15,371,355		(11,347,310)		12,551,205
Purchases of short-term U.S. government and agency obligations		(1,819,678,736)		(920,726,003)		(599,166,468)
Proceeds from sales or maturities of short-term U.S government and agency obligations		1,834,013,986		869,284,481		585,220,876
Net amortization and accretion on short-term U.S government and agency obligations		(1,201,747)		(466,392)		(41,722)
Net realized gain (loss) on investments		772		(6,650)		(1,703)
Change in unrealized appreciation/depreciation on investments		11,354		(3,010)		3,657
Decrease (Increase) in receivable on futures contracts		1,816,796		(3,220,337)		8,053,303
Increase (Decrease) in payable to Sponsor		(32,700)		10,220		(3,334)
Net cash provided by (used in) operating activities		(168,303,025)		(262,767,806)		(21,288,722)
Cash flow from financing activities
Proceeds from addition of shares		318,930,520		515,131,303		187,659,682
Payment on shares redeemed		(153,313,288)		(249,951,175)		(165,941,648)
Net cash provided by (used in) financing activities		165,617,232		265,180,128		21,718,034
Net increase (decrease) in cash		(2,685,793)		2,412,322		429,312
Cash, beginning of period		4,536,425		2,124,103		1,694,791
Cash, end of period		$ 1,850,632		$ 4,536,425		$ 2,124,103
[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).
[2]	The operations include the activity of: ProShares Managed Futures Strategy through March 30, 2016 and ProShares UltraShort Bloomberg Commodity and ProShares Ultra Bloomberg Commodity through September 1, 2016, the date of liquidation, respectively.
[3]	The operations include the activity of: ProShares Managed Futures Strategy through March 30, 2016, ProShares UltraShort Bloomberg Commodity and ProShares Ultra Bloomberg Commodity through September 1, 2016, the date of liquidation, respectively.
[4]	The operations include the activity of ProShares Ultra Australian Dollar through June 29, 2015, the date of liquidation.
[5]	Since the Fund's inception date was January 13, 2017, the Statements of Cash Flows for the years ended December 31, 2016 and December 31, 2015 have not been provided.
[6]	Since the Fund's inception date was January 13, 2017, the Statements of Changes in Shareholders' Equity for the years ended December 31, 2016 and December 31, 2015 have not been provided.
[7]	Since the Fund's inception date was January 13, 2017, the Statements of Operations for the years ended December 31, 2016 and December 31, 2015 have not been provided.

Organization

Organization	12 Months Ended
	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	NOTE 1 – ORGANIZATION ProShares Trust II (formerly known as the Commodities and Currencies Trust) (the “Trust”) is a Delaware statutory trust formed on October 9, 2007 and is currently organized into separate series (each, a “Fund” and collectively, the “Funds”). As of December 31, 2017, the following twenty series of the Trust have commenced investment operations: (i) ProShares VIX Short-Term Futures ETF and ProShares VIX Mid-Term The Trust had no operations prior to November 24, 2008, other than matters relating to its organization, the registration of each series under the Securities Act of 1933, as amended, and the sale and issuance to ProShare Capital Management LLC (the “Sponsor”) of fourteen Shares at an aggregate purchase price of $350 in each of the following Funds: ProShares UltraShort Bloomberg Crude Oil, ProShares UltraShort Gold, ProShares UltraShort Silver, ProShares UltraShort Euro, ProShares UltraShort Yen, ProShares Ultra Bloomberg Crude Oil, ProShares Ultra Gold, ProShares Ultra Silver, ProShares Ultra Euro and ProShares Ultra Yen. Groups of Funds are collectively referred to in several different ways. References to “Short Funds,” “UltraShort Funds,” “Ultra Funds,” or “UltraPro Funds” refer to the different Funds based upon their investment objectives, but without distinguishing among the Funds’ benchmarks. References to “Commodity Index Funds,” “Commodity Funds” and “Currency Funds” refer to the different Funds according to their general benchmark categories without distinguishing among the Funds’ investment objectives or Fund-specific benchmarks. References to “VIX Funds” refer to the different Funds based upon their investment objective and their general benchmark categories. Each “Short” Fund seeks daily investment results (before fees and expenses) that correspond to the inverse (-1x) (-2x) (-3x) The Geared Funds do not seek to achieve their stated investment objective over a period of time greater than a single day because mathematical compounding prevents the Geared Funds from achieving such results. Accordingly, results over periods of time greater than a single day should not be expected to be a simple multiple (e.g., -1x, -2x, -3x Each of the Funds generally invests in Financial Instruments (i.e., instruments whose value is derived from the value of an underlying asset, rate or index, including futures contracts, swap agreements, forward contracts and other instruments) as a substitute for investing directly in commodities, currencies, or spot volatility products in order to gain exposure to its applicable underlying commodity futures index, commodity, currency exchange rate or equity volatility index. Financial Instruments also are used to produce economically “inverse,” “inverse leveraged” or “leveraged” investment results for the Geared Funds. Share Splits and Reverse Share Splits The table below includes Share splits and reverse Share splits for the Funds during the years ended December 31, 2015, 2016 and 2017. The ticker symbols for these Funds did not change, and each Fund continues to trade on the NYSE Arca. Fund Execution Date (Prior to Opening of Trading) Type of Split Date Trading Resumed at Post- Split Price ProShares Ultra VIX Short-Term Futures ETF May 20, 2015 1-for-5 reverse Share split May 20, 2015 ProShares Ultra Bloomberg Crude Oil May 20, 2015 1-for-5 reverse Share split May 20, 2015 ProShares Ultra Bloomberg Natural Gas May 20, 2015 1-for-4 May 20, 2015 ProShares Ultra Yen May 20, 2015 1-for-4 May 20, 2015 ProShares UltraShort Silver November 13, 2015 2-for-1 November 13, 2015 ProShares UltraShort Bloomberg Natural Gas July 20, 2016 3-for-1 July 25, 2016 ProShares VIX Short-Term Futures ETF July 25, 2016 1-for-5 July 25, 2016 ProShares Ultra VIX Short-Term Futures ETF July 25, 2016 1-for-5 July 25, 2016 ProShares UltraShort Bloomberg Crude Oil January 11, 2017 2-for-1 January 12, 2017 ProShares Ultra Bloomberg Crude Oil January 11, 2017 1-for-2 January 12, 2017 ProShares Ultra VIX Short-Term Futures ETF January 11, 2017 1-for-5 January 12, 2017 ProShares Short VIX Short-Term Futures ETF July 12, 2017 2-for-1 July 17, 2017 ProShares VIX Short-Term Futures ETF July 14, 2017 1-for-4 July 17, 2017 ProShares Ultra VIX Short-Term Futures ETF July 14, 2017 1-for-4 July 17, 2017 The reverse splits were applied retroactively for all periods presented, reducing the number of Shares outstanding for each of the Funds, and resulted in a proportionate increase in the price per Share and per Share information of each such Fund. Therefore, the reverse splits did not change the aggregate net asset value of a shareholder’s investment at the time of the reverse split. The splits were applied retroactively for all periods presented, increasing the number of Shares outstanding for each of the Funds, and resulted in a proportionate decrease in the price per Share and per Share information of each such Fund. Therefore, the splits did not change the aggregate net asset value of a shareholder’s investment at the time of the split.

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Significant Accounting Policies	NOTE 2 – SIGNIFICANT ACCOUNTING POLICIES Each Fund is an investment company, as defined by Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 946 “Financial Services — Investment Companies.” As such, the Funds follow the investment company accounting and reporting guidance. The following is a summary of significant accounting policies followed by each Fund, as applicable, in preparation of its financial statements. These policies are in conformity with accounting principles generally accepted in the United States of America (“GAAP”). Certain prior year amounts have been reclassified to conform to the current year presentation. Use of Estimates & Indemnifications The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. In the normal course of business, the Trust enters into contracts that contain a variety of representations which provide general indemnifications. The Trust’s maximum exposure under these arrangements cannot be known; however, the Trust expects any risk of loss to be remote. Basis of Presentation Pursuant to rules and regulations of the U.S. Securities and Exchange Commission (“SEC”), audited financial statements are presented for the Trust as a whole, as the SEC registrant, and for each Fund individually. The debts, liabilities, obligations and expenses incurred, contracted for or otherwise existing with respect to a particular Fund shall be enforceable only against the assets of such Fund and not against the assets of the Trust generally or any other Fund. Accordingly, the assets of one Fund of the Trust include only those funds and other assets that are paid to, held by or distributed to the Trust for the purchase of Shares in that Fund. Statement of Cash Flows The cash amount shown in the Statements of Cash Flows is the amount reported as cash in the Statement of Financial Condition dated December 31, 2017 and 2016, and represents non-segregated Final Net Asset Value for Fiscal Period The cut-off Create/Redeem Cut-off* NAV Calculation Time NAV Calculation Date UltraShort Silver, Ultra Silver 6:30 a.m. 7:00 a.m. December 29 UltraShort Gold, Ultra Gold 9:30 a.m. 10:00 a.m. December 29 UltraShort Bloomberg Crude Oil, Ultra Bloomberg Crude Oil, 2:00 p.m. 2:30 p.m. December 29 UltraPro 3x Short Crude Oil, UltraPro 3x Crude Oil ETF UltraShort Bloomberg Natural Gas, Ultra Bloomberg Natural Gas 2:00 p.m. 2:30 p.m. December 29 UltraShort Australian Dollar 3:00 p.m. 4:00 p.m. December 29 Short Euro UltraShort Euro, Ultra Euro 3:00 p.m. 4:00 p.m. December 29 UltraShort Yen, Ultra Yen 3:00 p.m. 4:00 p.m. December 29 VIX Short-Term Futures ETF, Ultra VIX Short-Term Futures ETF, Short VIX Short-Term Futures ETF 2:00 p.m. 4:15 p.m. December 29 VIX Mid-Term 2:00 p.m. 4:15 p.m. December 29 * Although the Funds’ shares may continue to trade on secondary markets subsequent to the calculation of the final NAV, these times represent the final opportunity to transact in creation or redemption units for the year ended December 31, 2017. Market value per Share is determined at the close of the NYSE Arca and may be later than when the Funds’ NAV per Share is calculated. For financial reporting purposes, the Funds value transactions based upon the final closing price in their primary markets. Accordingly, the investment valuations in these financial statements may differ from those used in the calculation of certain of the Funds’ final creation/redemption NAV for the year ended December 31, 2017. Investment Valuation Short-term investments are valued at amortized cost which approximates fair value for daily NAV purposes. For financial reporting purposes, short-term investments are valued at their market price using information provided by a third-party pricing service or market quotations. In each of these situations, valuations are typically categorized as Level I in the fair value hierarchy. Derivatives ( e.g. non-exchange-traded Fair value pricing may require subjective determinations about the value of an investment. While the Funds’ policies are intended to result in a calculation of its respective Fund’s NAV that fairly reflects investment values as of the time of pricing, such Fund cannot ensure that fair values determined by the Sponsor or persons acting at their direction would accurately reflect the price that a Fund could obtain for an investment if it were to dispose of that investment as of the time of pricing (for instance, in a forced or distressed sale). The prices used by such Fund may differ from the value that would be realized if the investments were sold and the differences could be material to the financial statements. Fair Value of Financial Instruments The Funds disclose the fair value of their investments in a hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The disclosure requirements establish a fair value hierarchy that distinguishes between: (1) market participant assumptions developed based on market data obtained from sources independent of the Funds (observable inputs); and (2) the Funds’ own assumptions about market participant assumptions developed based on the best information available under the circumstances (unobservable inputs). The three levels defined by the disclosure requirements hierarchy are as follows: Level I – Quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date. Level II – Inputs other than quoted prices included within Level I that are observable for the asset or liability, either directly or indirectly. Level II assets include the following: quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability, and inputs that are derived principally from or corroborated by observable market data by correlation or other means (market-corroborated inputs). Level III – Unobservable pricing input at the measurement date for the asset or liability. Unobservable inputs shall be used to measure fair value to the extent that observable inputs are not available. In some instances, the inputs used to measure fair value might fall in different levels of the fair value hierarchy. The level in the fair value hierarchy within which the fair value measurement in its entirety falls is determined based on the lowest input level that is significant to the fair value measurement in its entirety. Fair value measurements also require additional disclosure when the volume and level of activity for the asset or liability have significantly decreased, as well as when circumstances indicate that a transaction is not orderly. The following table summarizes the valuation of investments at December 31, 2017 using the fair value hierarchy: Level I - Quoted Prices Level II - Other Significant Observable Inputs Short-Term U.S. Futures Forward Foreign Swap Total Short Euro $ 6,996,235 $ (166,288 ) $ — $ — $ — $ 6,829,947 Short VIX Short-Term Futures ETF 494,910,644 17,041,449 — — — 511,952,093 Ultra Bloomberg Crude Oil 459,515,902 11,945,979 — — 62,238,361 533,700,242 Ultra Bloomberg Natural Gas 50,961,356 7,225,810 — — — 58,187,166 Ultra Euro 6,996,235 — — 264,152 — 7,260,387 Ultra Gold 88,884,844 5,480 3,646,355 — — 92,536,679 Ultra Silver 235,581,716 1,600 21,735,334 — — 257,318,650 Ultra VIX Short-Term Futures ETF 287,533,132 (34,466,120 ) — — — 253,067,012 Ultra Yen 1,997,933 — — (34,824 ) — 1,963,109 UltraShort Australian Dollar 11,983,904 (893,220 ) — — — 11,090,684 UltraPro 3X Crude Oil ETF — 1,417,998 — — — 1,417,998 UltraPro 3X Short Crude Oil ETF — (2,988,155 ) — — — (2,988,155 ) UltraShort Bloomberg Crude Oil 253,646,823 (3,962,648 ) — — (30,607,142 ) 219,077,033 UltraShort Bloomberg Natural Gas 3,999,751 (1,097,049 ) — — — 2,902,702 UltraShort Euro 204,770,166 — — (6,344,269 ) — 198,425,897 UltraShort Gold 31,977,900 (5,460 ) (1,488,259 ) — — 30,484,181 UltraShort Silver 18,349,861 (1,650 ) (1,716,163 ) — — 16,632,048 UltraShort Yen 131,834,352 — — 1,527,263 — 133,361,615 VIX Mid-Term 20,993,515 (2,215,280 ) — — — 18,778,235 VIX Short-Term Futures ETF 134,845,604 (4,761,877 ) — — — 130,083,727 Total Trust $ 2,445,779,873 $ (12,919,431 ) $ 22,177,267 $ (4,587,678 ) $ 31,631,219 $ 2,482,081,250 * Includes cumulative appreciation/depreciation of futures contracts as reported in the Schedules of Investments. Only current day’s variation margin is reported within the Statements of Financial Condition in receivable/payable on open futures. At December 31, 2017, there were no Level III portfolio investments for which significant unobservable inputs were used to determine fair value. The Funds’ policy is to recognize transfers between valuation levels at the end of the reporting period. At December 31, 2017, there were no significant transfers in or out of Level I and Level II fair value measurements. The inputs or methodology used for valuing investments are not necessarily an indication of the risk associated with investing in those securities. The following table summarizes the valuation of investments at December 31, 2016 using the fair value hierarchy: Level I - Quoted Prices Level II - Other Significant Observable Inputs Short-Term U.S. Futures Forward Foreign Swap Total Short Euro $ 13,164,828 $ 132,900 $ — $ — $ — $ 13,297,728 Short VIX Short-Term Futures ETF 170,396,436 (10,309,611 ) — — — 160,086,825 Ultra Bloomberg Crude Oil 885,050,007 5,537,165 — — 55,358,571 945,945,743 Ultra Bloomberg Natural Gas 36,183,648 2,536,720 — — — 38,720,368 Ultra Euro 11,891,831 — — (574,010 ) — 11,317,821 Ultra Gold 95,356,621 (18,960 ) (4,431,107 ) — — 90,906,554 Ultra Silver 295,300,799 (27,360 ) (20,976,189 ) — — 274,297,250 Ultra VIX Short-Term Futures ETF 434,671,795 (7,972,237 ) — — — 426,699,558 Ultra Yen 5,282,879 — — (342,076 ) — 4,940,803 UltraShort Australian Dollar 12,909,619 1,182,340 — — — 14,091,959 UltraShort Bloomberg Crude Oil 205,694,385 (1,426,815 ) — — (12,206,881 ) 192,060,689 UltraShort Bloomberg Natural Gas 2,899,151 (482,031 ) — — — 2,417,120 UltraShort Euro 337,375,787 — — 16,162,931 — 353,538,718 UltraShort Gold 60,540,555 18,980 3,033,566 — — 63,593,101 UltraShort Silver 21,550,319 27,310 1,384,246 — — 22,961,875 UltraShort Yen 257,102,313 — — 16,744,937 — 273,847,250 VIX Mid-Term 45,486,235 (1,288,245 ) — — — 44,197,990 VIX Short-Term Futures ETF 147,991,233 (468,652 ) — — — 147,522,581 Total Trust $ 3,038,848,441 $ (12,558,496 ) $ (20,989,484 ) $ 31,991,782 $ 43,151,690 $ 3,080,443,933 * Includes cumulative appreciation/depreciation of futures contracts as reported in the Schedules of Investments. Only current day’s variation margin is reported within the Statements of Financial Condition in receivable/payable on open futures. At December 31, 2016, there were no Level III portfolio investments for which significant unobservable inputs were used to determine fair value. The Funds’ policy is to recognize transfers between valuation levels at the end of the reporting period. At December 31, 2016, there were no significant transfers in or out of Level I and Level II fair value measurements. The inputs or methodology used for valuing investments are not necessarily an indication of the risk associated with investing in those securities. Investment Transactions and Related Income Investment transactions are recorded on the trade date. All such transactions are recorded on the identified cost basis and marked to market daily. Unrealized appreciation/depreciation on open contracts are reflected in the Statements of Financial Condition and changes in the unrealized appreciation/depreciation between periods are reflected in the Statements of Operations. Discounts on short-term securities purchased are amortized and reflected as Interest Income in the Statements of Operations. Brokerage Commissions and Fees Each Fund pays its respective brokerage commissions, including applicable exchange fees, National Futures Association (“NFA”) fees, give-up recognized on a half-turn basis (e.g., the first half is recognized when the contract is purchased (opened) and the second half is recognized when the transaction is closed). The Sponsor is currently paying brokerage commissions on VIX futures contracts for the Matching VIX Funds that exceed variable create/redeem fees collected by more than 0.02% of the Matching VIX Fund’s average net assets annually. Federal Income Tax Each Fund is registered as a series of a Delaware statutory trust and is treated as a partnership for U.S. federal income tax purposes. Accordingly, no Fund expects to incur U.S. federal income tax liability; rather, each beneficial owner of a Fund’s Shares is required to take into account its allocable share of its Fund’s income, gain, loss, deductions and other items for its Fund’s taxable year ending with or within the beneficial owner’s taxable year. Management of the Funds has reviewed all open tax years and major jurisdictions ( i.e. on-going New Accounting Pronouncements In November 2016, the FASB issued Accounting Standards Update No. 2016-18, 2016-18”),

Investments

Investments	12 Months Ended
	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Investments	NOTE 3 – INVESTMENTS Short-Term Investments The Funds may purchase U.S. Treasury Bills, agency securities, and other high-credit quality short-term fixed income or similar securities with original maturities of one year or less. A portion of these investments may be posted as collateral in connection with swap agreements and/or used as collateral for a Fund’s trading in futures and forward contracts. Accounting for Derivative Instruments In seeking to achieve each Fund’s investment objective, the Sponsor uses a mathematical approach to investing. Using this approach, the Sponsor determines the type, quantity and mix of investment positions, including derivative positions, which the Sponsor believes in combination, should produce returns consistent with a Fund’s objective. All open derivative positions at period end are reflected on each respective Fund’s Schedule of Investments. Certain Funds utilized a varying level of derivative instruments in conjunction with investment securities in seeking to meet their investment objective during the period. While the volume of open positions may vary on a daily basis as each Fund transacts derivatives contracts in order to achieve the appropriate exposure to meet its investment objective, the volume of these open positions relative to the net assets of each respective Fund at the date of this report is generally representative of open positions throughout the reporting period. Following is a description of the derivative instruments used by the Funds during the reporting period, including the primary underlying risk exposures related to each instrument type. Futures Contracts The Funds enter into futures contracts to gain exposure to changes in the value of, or as a substitute for investing directly in (or shorting), an underlying index, currency or commodity. A futures contract obligates the seller to deliver (and the purchaser to accept) the future delivery of a specified quantity and type of asset at a specified time and place. The contractual obligations of a buyer or seller may generally be satisfied by taking or making physical delivery of the underlying commodity, if applicable, or by making an offsetting sale or purchase of an identical futures contract on the same or linked exchange before the designated date of delivery, or by cash settlement at expiration of contract. Upon entering into a futures contract, each Fund is required to deposit and maintain as collateral at least such initial margin as required by the exchange on which the transaction is affected. The initial margin is segregated as cash and/or securities balances with brokers for futures contracts, as disclosed in the Statements of Financial Condition, and is restricted as to its use. The Funds that enter into futures contracts maintain collateral at the broker in the form of cash and/or securities. Pursuant to the futures contract, each Fund generally agrees to receive from or pay to the broker(s) an amount of cash equal to the daily fluctuation in value of the futures contract. Such receipts or payments are known as variation margin and are recorded by each Fund as unrealized gains or losses. Each Fund will realize a gain or loss upon closing of a futures transaction. Futures contracts involve, to varying degrees, elements of market risk (specifically commodity price risk or equity market volatility risk) and exposure to loss in excess of the amount of variation margin. The face or contract amounts reflect the extent of the total exposure each Fund has in the particular classes of instruments. Additional risks associated with the use of futures contracts are imperfect correlation between movements in the price of the futures contracts and the market value of the underlying index or commodity and the possibility of an illiquid market for a futures contract. With futures contracts, there is minimal but some counterparty risk to the Funds since futures contracts are exchange-traded and the exchange’s clearinghouse, as counterparty to all exchange-traded futures contracts, guarantees the futures contracts against default. Many futures exchanges and boards of trade limit the amount of fluctuation permitted in futures contract prices during a single trading day. Once the daily limit has been reached in a particular contract, no trades may be made that day at a price beyond that limit or trading may be suspended for specified times during the trading day. Futures contracts prices could move to the limit for several consecutive trading days with little or no trading, thereby preventing prompt liquidation of futures positions and potentially subjecting a Fund to substantial losses. If trading is not possible, or if a Fund determines not to close a futures position in anticipation of adverse price movements, the Fund will be required to make daily cash payments of variation margin. The risk the Fund will be unable to close out a futures position will be minimized by entering into such transactions on a national exchange with an active and liquid secondary market. Swap Agreements Certain of the Funds enter into swap agreements for purposes of pursuing their investment objectives or as a substitute for investing directly in (or shorting) an underlying index, currency or commodity, or to create an economic hedge against a position. Swap agreements are two-party over-the-counter Generally, swap agreements entered into by the Funds calculate and settle the obligations of the parties to the agreement on a “net basis” with a single payment. Consequently, each Fund’s current obligations (or rights) under a swap agreement will generally be equal only to the net amount to be paid or received under the agreement based on the relative values of such obligations (or rights) (the “net amount”). In a typical swap agreement entered into by a Matching VIX Fund or an Ultra Fund, the Matching VIX Fund or Ultra Fund would be entitled to settlement payments in the event the level of the benchmark increases and would be required to make payments to the swap counterparties in the event the level of the benchmark decreases, adjusted for any transaction costs or trading spreads on the notional amount the Funds may pay. In a typical swap agreement entered into by a Short Fund or an UltraShort Fund, the Short Fund or UltraShort Fund would be required to make payments to the swap counterparties in the event the level of the benchmark increases and would be entitled to settlement payments in the event the level of the benchmark decreases, adjusted for any transaction costs or trading spreads on the notional amount the Funds may pay. The net amount of the excess, if any, of each Fund’s obligations over its entitlements with respect to each uncleared swap agreement is accrued on a daily basis and an amount of cash and/or securities having an aggregate value at least equal to such accrued excess is maintained for the benefit of the counterparty in a segregated account by the Funds’ Custodian. The net amount of the excess, if any, of each Fund’s entitlements over its obligations with respect to each uncleared swap agreement is accrued on a daily basis and an amount of cash and/or securities having an aggregate value at least equal to such accrued excess is maintained for the benefit of the Fund in a segregated account by the Fund’s Custodian. Until a swap agreement is settled in cash, the gain or loss on the notional amount less any transaction costs or trading spreads payable by each Fund on the notional amount are recorded as “unrealized appreciation or depreciation on swap agreements” and, when cash is exchanged, the gain or loss realized is recorded as “realized gains or losses on swap agreements.” Swap agreements are generally valued at the last settled price of the benchmark referenced asset. The Trust, on behalf of a Fund, may enter into agreements with certain counterparties for derivative transactions. These agreements contain various conditions, events of default, termination events, covenants and representations. The triggering of certain events or the default on certain terms of the agreement could allow a party to terminate a transaction under the agreement and request immediate payment in an amount equal to the net positions owed the party under the agreement. This could cause a Fund to have to enter into a new transaction with the same counterparty, enter into a transaction with a different counterparty or seek to achieve its investment objective through any number of different investments or investment techniques. Swap agreements involve, to varying degrees, elements of market risk and exposure to loss in excess of the unrealized gain/loss reflected. The notional amounts reflect the extent of the total investment exposure each Fund has under the swap agreement, which may exceed the NAV of each Fund. Additional risks associated with the use of swap agreements are imperfect correlations between movements in the notional amount and the price of the underlying reference index and the inability of counterparties to perform. Each Fund bears the risk of loss of the amount expected to be received under a swap agreement in the event of the default or bankruptcy of a swap agreement counterparty. A Fund will typically enter into swap agreements only with major global financial institutions. The creditworthiness of each of the firms that is a party to a swap agreement is monitored by the Sponsor. The Sponsor may use various techniques to minimize credit risk including early termination and payment, using different counterparties, limiting the net amount due from any individual counterparty and generally requiring collateral to be posted by the counterparty in an amount approximately equal to that owed to the Funds. All of the outstanding swap agreements at December 31, 2017 contractually terminate within one month but may be terminated without penalty by either party daily. Upon termination, the Fund is entitled to pay or receive the “unrealized appreciation or depreciation” amount. The Funds, as applicable, collateralize swap agreements by segregating or designating cash and/or certain securities as indicated on the Statements of Financial Condition or Schedules of Investments. As noted above, collateral posted in connection with uncleared derivative transactions is held for the benefit of the counterparty in a segregated tri-party non-payment The Funds remain subject to credit risk with respect to the amount they expect to receive from counterparties. However, the Funds have sought to mitigate these risks in connection with uncleared swaps by generally requiring that the counterparties for each Fund agree to post collateral for the benefit of the Fund, marked to market daily, in an amount approximately equal to what the counterparty owes the Fund, subject to certain minimum thresholds. In the event of the bankruptcy of a counterparty, the Fund will have direct access to the collateral received from the counterparty, generally as of the day prior to the bankruptcy, because there is a one day time lag between the Fund’s request for collateral and the delivery of such collateral. To the extent any such collateral is insufficient, the Funds will be exposed to counterparty risk as described above, including the possible delays in recovering amounts as a result of bankruptcy proceedings. As of December 31, 2017, the collateral posted by counterparties consisted of cash and/or U.S. Treasury securities. The counterparty/credit risk for cleared derivative transactions is generally lower than for uncleared OTC derivatives since generally a clearing organization becomes substituted for each counterparty to a cleared derivative contract and, in effect, guarantees the parties’ performance under the contract as each party to a trade looks only to the clearing organization for performance of financial obligations. In addition, cleared derivative transactions benefit from daily marking-to-market Forward Contracts Certain of the Funds enter into forward contracts for purposes of pursuing their investment objectives and as a substitute for investing directly in (or shorting) commodities and/or currencies. A forward contract is an agreement between two parties to purchase or sell a specified quantity of an asset at or before a specified date in the future at a specified price. Forward contracts are typically traded in OTC markets and all details of the contract are negotiated between the counterparties to the agreement. Accordingly, the forward contracts are valued by reference to the contracts traded in the OTC markets. The contractual obligations of a buyer or seller may generally be satisfied by taking or making physical delivery of the underlying commodity or currency, establishing an opposite position in the contract and recognizing the profit or loss on both positions simultaneously on the delivery date or, in some instances, paying a cash settlement before the designated date of delivery. The forward contracts are adjusted by the daily fluctuation of the underlying commodity or currency and any gains or losses are recorded for financial statement purposes as unrealized gains or losses until the contract settlement date. Forward contracts have traditionally not been cleared or guaranteed by a third party. As a result of the Dodd-Frank Act, the CFTC now regulates non-deliverable non-deliverable non-deliverable The Funds may collateralize uncleared forward commodity contracts by segregating or designating cash and/or certain securities as indicated on their Statements of Financial Condition or Schedules of Investments. Such collateral is held for the benefit of the counterparty in a segregated tri-party non-payment The Funds remain subject to credit risk with respect to the amount they expect to receive from counterparties. However, the Funds have sought to mitigate these risks by generally requiring that the counterparties for each Fund agree to post collateral for the benefit of the Fund, marked to market daily, in an amount approximately equal to what the counterparty owes the Fund, subject to minimum thresholds. In the event of the bankruptcy of a counterparty, the Fund will have direct access to the collateral received from the counterparty, generally as of the day prior to the bankruptcy, because there is a one day time lag between the Fund’s request for collateral and the delivery of such collateral. To the extent any such collateral is insufficient, the Fund will be exposed to counterparty risk as described above, including the possible delays in recovering amounts as a result of bankruptcy proceedings. As of December 31, 2017, the collateral posted by counterparties consisted of cash and/or U.S. Treasury securities. Participants in trading foreign exchange forward contracts often do not require margin deposits, but rely upon internal credit limitations and their judgments regarding the creditworthiness of their counterparties. In recent years, however, many OTC market participants in foreign exchange trading have begun to require their counterparties to post margin. A Fund will typically enter into forward contracts only with major global financial institutions. The creditworthiness of each of the firms that is a party to a forward contract is monitored by the Sponsor. The counterparty/credit risk for cleared derivative transactions is generally lower than for uncleared OTC derivatives since generally a clearing organization becomes substituted for each counterparty to a cleared derivative contract and, in effect, guarantees the parties’ performance under the contract as each party to a trade looks only to the clearing organization for performance of financial obligations. In addition, cleared derivative transactions benefit from daily marking-to-market The following tables indicate the location of derivative related items on the Statement of Financial Condition as well as the effect of derivative instruments on the Statement of Operations during the reporting period. Fair Value of Derivative Instruments as of December 31, 2017 Assets Derivatives Liability Derivatives Derivatives not accounted for as hedging instruments Statements of Financial Fund Unrealized Statements of Financial Fund Unrealized VIX Futures Contracts Receivables on open futures contracts ProShares Short VIX Short-Term Futures ETF $ 21,493,549 * Payable on open futures contracts ProShares Short VIX Short-Term Futures ETF $ 4,452,100 * ProShares Ultra VIX Short-Term Futures ETF 3,974,642 * ProShares Ultra VIX Short-Term Futures ETF 38,440,762 * ProShares VIX Short-Term Futures ETF 709,708 * ProShares VIX Mid-Term 2,215,280 * ProShares VIX Short-Term Futures ETF 5,471,585 * Commodities Contracts Receivables on open futures contracts, unrealized appreciation on swap and/or forward agreements ProShares Ultra Bloomberg Crude Oil 74,184,340 * Payable on open futures contracts, unrealized depreciation on swap and/or forward agreements ProShares UltraPro 3x Short Crude Oil ETF 2,988,155 * ProShares Ultra Bloomberg Natural Gas 7,225,810 * ProShares UltraShort Bloomberg Crude Oil 34,569,790 * ProShares Ultra Gold 3,651,835 * ProShares UltraShort Bloomberg Natural Gas 1,097,049 * ProShares Ultra Silver 21,736,934 * ProShares UltraShort Gold 1,493,719 * ProShares UltraPro 3x Crude Oil ETF 1,417,998 * ProShares UltraShort Silver 1,717,813 * Foreign Exchange Contracts Unrealized appreciation on foreign currency forward contracts and receivables on open futures contracts ProShares Ultra Euro 321,609 Unrealized depreciation on foreign currency forward contracts and payable on open futures contracts ProShares Short Euro 166,288 * ProShares UltraShort Euro 449,302 ProShares Ultra Euro 57,457 ProShares UltraShort Yen 1,568,997 ProShares Ultra Yen 34,824 ProShares UltraShort Australian Dollar 893,220 * ProShares UltraShort Euro 6,793,571 ProShares UltraShort Yen 41,734 Total Trust $ 136,734,724 * Total Trust $ 100,433,347 * * Includes cumulative appreciation/depreciation of futures contracts as reported in the Schedules of Investments. Only current day’s variation margin is reported within the Statements of Financial Condition in receivable/payable on open futures contracts. Fair Value of Derivative Instruments as of December 31, 2016 Assets Derivatives Liability Derivatives Derivatives not accounted for as hedging instruments Statements of Financial Fund Unrealized Statements of Financial Fund Unrealized VIX Futures Contracts Receivables on open futures contracts ProShares VIX Short-Term Futures ETF $ 2,273,874 * Payable on open futures contracts ProShares VIX Short-Term Futures ETF $ 2,742,526 * ProShares VIX Mid-Term 68,375 * ProShares VIX Mid-Term 1,356,620 * ProShares Ultra VIX Short-Term Futures ETF 13,594,875 * ProShares Short VIX Short-Term Futures ETF 10,309,611 * ProShares Ultra VIX Short-Term Futures ETF 21,567,112 * Commodities Contracts Receivables on open futures contracts, unrealized appreciation on swap and/or forward agreements ProShares UltraShort Gold 3,052,546 * Payable on open futures contracts, unrealized depreciation on swap and/or forward agreements ProShares UltraShort Bloomberg Crude Oil 13,633,696 * ProShares UltraShort Silver 1,411,556 * ProShares UltraShort Bloomberg Natural Gas 482,031 * ProShares Ultra Bloomberg Crude Oil 60,895,736 * ProShares Ultra Gold 4,450,067 * ProShares Ultra Bloomberg Natural Gas 2,536,720 * ProShares Ultra Silver 21,003,549 * Foreign Exchange Contracts Unrealized appreciation on foreign currency forward contracts and receivables on open futures contracts ProShares Short Euro 132,900 * Unrealized depreciation on foreign currency forward contracts and payable on open futures contracts ProShares UltraShort Euro 356,139 ProShares UltraShort Australian Dollar 1,182,340 * ProShares UltraShort Yen 125,420 ProShares UltraShort Euro 16,519,070 ProShares Ultra Euro 576,558 ProShares UltraShort Yen 16,870,357 ProShares Ultra Yen 342,455 ProShares Ultra Euro 2,548 ProShares Ultra Yen 379 Total Trust $ 118,541,276 * Total Trust $ 76,945,784 * * Includes cumulative appreciation/depreciation of futures contracts as reported in the Schedules of Investments. Only current day’s variation margin is reported within the Statements of Financial Condition in receivable/payable on open futures contracts. The Effect of Derivative Instruments on the Statements of Operations For the year ended December 31, 2017 Derivatives not accounted for as hedging instruments Location of Gain (Loss) on Derivatives Recognized in Income Fund Realized Gain (Loss) on Recognized in Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in VIX Futures Contracts Net realized gain (loss) on futures contracts/ changes in unrealized appreciation/ depreciation on futures contracts ProShares Short VIX Short-Term Futures ETF $ 897,400,516 $ 27,351,060 ProShares Ultra VIX Short-Term Futures ETF (1,020,750,851 ) (26,493,883 ) ProShares VIX Mid-Term (25,319,770 ) (927,035 ) ProShares VIX Short-Term Futures ETF (194,005,568 ) (4,293,225 ) Commodity Contracts Net realized gain (loss) on futures contracts, swap and/or forward agreements/changes in unrealized appreciation/ depreciation on futures contracts, swap and/or forward agreements ProShares Ultra Bloomberg Crude Oil 22,146,212 13,288,604 ProShares Ultra Bloomberg Natural Gas (40,793,265 ) 4,689,090 ProShares Ultra Gold 11,484,410 8,101,902 ProShares Ultra Silver (31,762,834 ) 42,740,483 ProShares UltraPro 3x Crude Oil ETF 6,018,618 1,417,998 ProShares UltraPro 3x Short Crude Oil ETF (7,046,628 ) (2,988,155 ) ProShares UltraShort Bloomberg Crude Oil (6,491,060 ) (20,936,094 ) ProShares UltraShort Bloomberg Natural Gas 4,762,532 (615,018 ) ProShares UltraShort Gold (6,993,557 ) (4,546,265 ) ProShares UltraShort Silver 1,153,393 (3,129,369 ) Foreign Exchange Contracts Net realized gain (loss) on futures and/or foreign currency forward contracts/changes in unrealized appreciation/ depreciation on futures and/or foreign currency forward contracts ProShares Short Euro (1,161,987 ) (299,188 ) ProShares Ultra Euro 2,212,313 838,162 ProShares Ultra Yen (46,195 ) 307,252 ProShares UltraShort Australian Dollar (866,771 ) (2,075,560 ) ProShares UltraShort Euro (39,691,680 ) (22,507,200 ) ProShares UltraShort Yen (8,729,472 ) (15,217,674 ) Total Trust $ (438,481,644 ) $ (5,294,115 ) The Effect of Derivative Instruments on the Statements of Operations For the year ended December 31, 2016 Derivatives not accounted for as hedging instruments Location of Gain (Loss) on Fund Realized Gain (Loss) on Recognized in Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income VIX Futures Contracts Net realized gain (loss) on futures contracts/ changes in unrealized appreciation/ depreciation on futures contracts ProShares VIX Short-Term Futures ETF $ (195,475,791 ) 609,973 ProShares VIX Mid-Term (11,085,506 ) (943,885 ) ProShares Short VIX Short-Term Futures ETF 440,391,389 (21,056,026 ) ProShares Ultra VIX Short-Term Futures ETF (1,567,340,688 ) (19,866,703 ) Commodity Contracts Net realized gain (loss) on futures contracts, swap and/or forward agreements/changes in unrealized appreciation/ depreciation on futures contracts, swap and/or forward agreements ProShares UltraShort Bloomberg Crude Oil (67,752,164 ) (22,510,865 ) ProShares UltraShort Bloomberg Natural Gas 586,860 1,989,133 ProShares UltraShort Gold (12,240,751 ) 1,238,384 ProShares UltraShort Silver (17,554,714 ) (3,372,693 ) ProShares Ultra Bloomberg Crude Oil 74,061,040 151,001,639 ProShares Ultra Bloomberg Natural Gas 17,571,809 (3,776,159 ) ProShares Ultra Gold 5,816,565 (2,194,272 ) ProShares Ultra Silver 62,342,441 1,566,582 Foreign Exchange Contracts Net realized gain (loss) on futures and/or foreign currency forward contracts/changes in unrealized appreciation/ depreciation on futures and/or foreign currency forward contracts ProShares Short Euro 663,774 (110,538 ) ProShares UltraShort Australian Dollar (2,787,204 ) 1,602,610 ProShares UltraShort Euro (25,711,518 ) 44,873,267 ProShares UltraShort Yen (22,220,271 ) 30,640,389 ProShares Ultra Euro 138,959 (1,178,930 ) ProShares Ultra Yen 717,086 (603,387 ) Total Trust $ (1,319,878,684 ) 157,908,519 The Effect of Derivative Instruments on the Statements of Operations For the year ended December 31, 2015 Derivatives not accounted for as hedging instruments Location of Gain or (Loss) on Derivatives Recognized in Income Fund Realized Gain or (Loss) on Recognized in Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income VIX Futures Contracts Net realized gain (loss) on futures contracts / changes in unrealized appreciation/ depreciation on futures contracts ProShares VIX Short-Term Futures ETF $ (19,408,543 ) $ (7,343,245 ) ProShares VIX Mid-Term (3,335,936 ) (605,025 ) ProShares Short VIX Short-Term Futures ETF 69,793,028 27,098,564 ProShares Ultra VIX Short-Term Futures ETF (392,174,228 ) (27,690,787 ) Commodity Contracts Net realized gain (loss) on futures contracts, swap and/or forward agreements/changes in unrealized appreciation/ depreciation on futures contracts, swap and/or forward agreements ProShares UltraShort Bloomberg Crude Oil 91,670,324 (33,947,511 ) ProShares UltraShort Bloomberg Natural Gas 15,212,804 (6,412,629 ) ProShares UltraShort Gold 12,707,635 4,101,460 ProShares UltraShort Silver 10,759,545 4,187,736 ProShares Ultra Bloomberg Crude Oil (896,177,096 ) 32,549,981 ProShares Ultra Bloomberg Natural Gas (100,776,817 ) 41,202,162 ProShares Ultra Gold (18,605,815 ) (4,311,529 ) ProShares Ultra Silver (78,309,309 ) (10,173,451 ) Foreign Exchange Contracts Net realized gain (loss) on futures and/or foreign currency forward contracts/changes in unrealized appreciation/ depreciation on futures and/or foreign currency forward contracts ProShares Short Euro 1,559,425 (141,893 ) ProShares UltraShort Australian Dollar 4,330,463 (1,163,751 ) ProShares UltraShort Euro 131,651,572 (45,473,330 ) ProShares UltraShort Yen 8,809,464 (12,316,677 ) ProShares Ultra Euro (1,982,208 ) 708,291 ProShares Ultra Yen (472,913 ) 276,556 Total Trust* $ (1,164,748,605 ) $ (39,455,078 ) * Amounts exclude the activity of: ProShares Managed Futures Strategy which liquidated on March 30, 2016, ProShares UltraShort Bloomberg Commodity and ProShares Ultra Bloomberg Commodity which liquidated on September 1, 2016. Offsetting Assets and Liabilities Each Fund is subject to master netting agreements or similar arrangements that allow for amounts owed between each Fund and the counterparty to be netted upon an early termination. The party that has the larger payable pays the excess of the larger amount over the smaller amount to the other party. The master netting agreements or similar arrangements do not apply to amounts owed to/from different counterparties. As described above, the Funds utilize derivative instruments to achieve their investment objective during the year. The amounts shown in the Statements of Financial Condition do not take into consideration the effects of legally enforceable master netting agreements or similar arrangements. For financial reporting purposes, the Funds do not offset derivative assets and derivative liabilities that are subject to netting arrangements in the Statements of Financial Condition. The following table presents each Fund’s derivatives by investment type and by counterparty net of amounts available for offset under a master netting agreement and the related collateral received or pledged by the Funds as of December 31, 2017: Fair Values of Derivative Instruments as of December 31, 2017 Assets Liabilities Gross Gross Net Amounts Gross Gross Net Amounts ProShares Ultra Bloomberg Crude Oil Swap agreements $ 62,238,361 $ — $ 62,238,361 $ — $ — $ — ProShares Ultra Euro Foreign currency forward contracts 321,609 — 321,609 57,457 — 57,457 ProShares Ultra Gold Forward agreements 3,646,355 — 3,646,355 — — — ProShares Ultra Silver Forward agreements 21,735,334 — 21,735,334 — — — ProShares UltraShort Bloomberg Crude Oil Swap agreements — — — 30,607,142 — 30,607,142 ProShares UltraShort Euro Foreign currency forward contracts 449,302 — 449,302 6,793,571 — 6,793,571 ProShares UltraShort Gold Forward agreements — — — 1,488,259 — 1,488,259 ProShares UltraShort Silver Forward agreements — — — 1,716,163 — 1,716,163 ProShares UltraShort Yen Foreign currency forward contracts 1,568,997 — 1,568,997 41,734 — 41,734 ProShares Ultra Yen Foreign currency forward contracts — — — 34,824 — 34,824 Asset (Liability) amounts shown in the table below represent amounts owed to (by) the Funds for the derivative-related investments at December 31, 2017. These amounts may be collateralized by cash or financial instruments, segregated for the benefit of the Funds or the counterparties, depending on whether the related contracts are in an appreciated or depreciated position at period end. Amounts shown in the column labeled “Net Amount” represent the uncollateralized portions of these amounts at period end. These amounts may be un-collateralized Gross Amounts Not Offset in the Statements of Financial Condition as of December 31, 2017 Amounts of Recognized Assets / (Liabilities) presented in the Statements of Financial Condition Financial Instruments for the Benefit of (the Funds) /the Counterparties Cash Collateral for the Benefit of (the Funds) / the Counterparties Net Amount ProShares Ultra Bloomberg Crude Oil Citibank N.A. $ 19,815,892 $ — $ — $ 19,815,892 Goldman Sachs International 16,654,031 (14,861,090 ) — 1,792,941 Societe Generale S.A. 9,003,519 (8,525,505 ) — 478,014 UBS AG 16,764,919 (15,477,566 ) — 1,287,353 ProShares Ultra Euro Goldman Sachs International 102,424 — — 102,424 UBS AG 161,728 — — 161,728 ProShares Ultra Gold Citibank N.A. 1,513,310 — — 1,513,310 Goldman Sachs International 969,501 (967,678 ) (1,823 ) — Societe Generale S.A. 218,319 — — 218,319 UBS AG 945,225 (945,225 ) — — ProShares Ultra Silver Citibank N.A. 7,201,744 — — 7,201,744 Goldman Sachs International 5,873,080 (4,903,696 ) — 969,384 Societe Generale S.A. 2,761,817 (2,516,153 ) — 245,664 UBS AG 5,898,693 (4,930,596 ) — 968,097 ProShares UltraShort Bloomberg Crude Oil Citibank N.A. (10,173,164 ) 10,173,164 — — Goldman Sachs International (9,242,398 ) 9,242,398 — — Societe Generale S.A. (1,904,113 ) 1,904,113 — — UBS AG (9,287,467 ) 9,287,467 — — ProShares UltraShort Euro Goldman Sachs International (3,297,612 ) 259,612 3,038,000 — UBS AG (3,046,657 ) 3,046,657 — — ProShares UltraShort Gold Citibank N.A. (554,559 ) 554,559 — — Goldman Sachs International (428,358 ) 428,358 — — Societe Generale S.A. (126,928 ) 126,928 — — UBS AG (378,414 ) 378,414 — — ProShares UltraShort Silver Citibank N.A. (632,593 ) 632,593 — — Goldman Sachs International (486,240 ) — 486,240 — Societe Generale S.A. (115,305 ) 115,305 — — UBS AG (482,025 ) 482,025 — — ProShares UltraShort Yen Goldman Sachs International 821,317 (810,030 ) — 11,287 UBS AG 705,946 — (705,946 ) — ProShares Ultra Yen Goldman Sachs International (17,410 ) 17,410 — — UBS AG (17,414 ) 17,414 — — The following table presents each Fund’s derivatives by investment type and by counterparty net of amounts available for offset under a master netting agreement and the related collateral received or pledged by the Funds as of December 31, 2016: Fair Values of Derivative Instruments as of December 31, 2016 Assets Liabilities Gross Gross Net Amounts Gross Gross Net Amounts ProShares Ultra Bloomberg Crude Oil Swap agreements $ 55,358,571 $ — $ 55,358,571 $ — $ — $ — ProShares Ultra Euro Foreign currency forward contracts 2,548 — 2,548 576,558 — 576,558 ProShares Ultra Gold Forward agreements — — — 4,431,107 — 4,431,107 ProShares Ultra Silver Forward agreements — — — 20,976,189 — 20,976,189 ProShares UltraShort Bloomberg Crude Oil Swap agreements — — — 12,206,881 — 12,206,881 ProShares UltraShort Euro Foreign currency forward contracts 16,519,070 — 16,519,070 356,139 — 356,139 ProShares UltraShort Gold Forward agreements 3,033,566 — 3,033,566 — — — ProShares UltraShort Silver Forward agreements 1,384,246 — 1,384,246 — — — ProShares UltraShort Yen Foreign currency forward contracts 16,870,357 — 16,870,357 125,420 — 125,420 ProShares Ultra Yen Foreign currency forward contracts 379 — 379 342,455 — 342,455 Asset (Liability) amounts shown in the table below represent amounts owed to (by) the Funds for the derivative-related investments at December 31, 2016. These amounts may be collateralized by cash or financial instruments, segregated for the benefit of the Funds or the counterparties, depending on whether the related contracts are in an appreciated or depreciated position at period end.

Agreements

Agreements	12 Months Ended
	Dec. 31, 2017
Text Block [Abstract]
Agreements	NOTE 4 – AGREEMENTS Management Fee Each Leveraged Fund, the Short Euro Fund and each Geared VIX Fund pays the Sponsor a Management Fee, monthly in arrears, in an amount equal to 0.95% per annum of its average daily NAV of such Fund. Each Matching VIX Fund pays the Sponsor a Management Fee, monthly in arrears, in an amount equal to 0.85% per annum of its average daily NAV of such Fund. The Sponsor did not and will not charge the Management Fee in the first year of operation of each Fund in an amount equal to the offering costs. The Sponsor reimbursed and will be reimburse each Fund, to the extent that its offering costs exceed the Management Fee, for the first year of operations. The Management Fee is paid in consideration of the Sponsor’s services as commodity pool operator, and for managing the business and affairs of the Funds. From the Management Fee, the Sponsor pays all of the routine operational, administrative and other ordinary expenses of each Fund, generally as determined by the Sponsor, including but not limited to the Administrator, Custodian, Distributor, ProFunds Distributors, Inc. (“PDI”), an affiliated broker-dealer of the Sponsor, Transfer Agent, accounting and auditing fees and expenses, any index licensors for the Funds, and the normal and expected expenses incurred in connection with the continuous offering of Shares of each Fund after the commencement of its trading operations, including, but not limited to, expenses such as tax preparation expenses, legal fees not in excess of $100,000 per annum, ongoing SEC registration fees not exceeding 0.021% per annum of the NAV of a Fund and Financial Industry Regulatory Authority (“FINRA”) filing fees, individual Schedule K-1 Non-Recurring Each Fund pays all its non-recurring Non-recurring The Administrator The Sponsor and the Trust, for itself and on behalf of each Fund, has appointed Brown Brothers Harriman & Co. (“BBH&Co.”) as the Administrator of the Funds, and the Sponsor, and the Trust, on its own behalf and on behalf of each Fund, and BBH&Co. have entered into an Administrative Agency Agreement (the “Administration Agreement”) in connection therewith. Pursuant to the terms of the Administration Agreement and under the supervision and direction of the Sponsor and the Trust, BBH&Co. prepares and files certain regulatory filings on behalf of the Funds. BBH&Co. may also perform other services for the Funds pursuant to the Administration Agreement as mutually agreed upon by the Sponsor, the Trust and BBH&Co. from time to time. Pursuant to the terms of the Administration Agreement, BBH&Co. also serves as the Transfer Agent of the Funds. The Administrator’s fees are paid on behalf of the Funds by the Sponsor. The Custodian BBH&Co. serves as the Custodian of the Funds, and the Trust, on its own behalf and on behalf of each Fund, and BBH&Co. have entered into a Custodian Agreement in connection therewith. Pursuant to the terms of the Custodian Agreement, BBH&Co. is responsible for the holding and safekeeping of assets delivered to it by the Funds, and performing various administrative duties in accordance with instructions delivered to BBH&Co. by the Funds. The Custodian’s fees are paid on behalf of the Funds by the Sponsor. The Distributor SEI Investments Distribution Co. (“SEI”), serves as Distributor of the Funds and assists the Sponsor and the Administrator with certain functions and duties relating to distribution and marketing, including taking creation and redemption orders, consulting with the marketing staff of the Sponsor and its affiliates with respect to compliance with the requirements of FINRA and/or the NFA in connection with marketing efforts, and reviewing and filing of marketing materials with FINRA and/or the NFA. SEI retains all marketing materials separately for each Fund, at c/o SEI, One Freedom Valley Drive, Oaks, PA 19456. The Sponsor, on behalf of each Fund, has entered into a Distribution Services Agreement with SEI. The Sponsor pays SEI for performing its duties on behalf of the Funds.

Offering Costs

Offering Costs	12 Months Ended
	Dec. 31, 2017
Text Block [Abstract]
Offering Costs	NOTE 5 – OFFERING COSTS Offering costs will be amortized by the Funds over a twelve month period on a straight-line basis beginning once the fund commences operations. The Sponsor will not charge its Management Fee in the first year of operations of a Fund in an amount equal to the offering costs. Normal and expected expenses incurred in connection with the continuous offering of Shares of a Fund after the commencement of its trading operations will be paid by the Sponsor. The Sponsor will reimburse ProShares UltraPro 3x Crude Oil ETF and ProShares UltraPro 3x Short Crude Oil ETF to the extent their respective offering costs exceeds 0.95% of their average daily NAV for the first year of operations.

Creation and Redemption of Crea

Creation and Redemption of Creation Units	12 Months Ended
	Dec. 31, 2017
Text Block [Abstract]
Creation and Redemption of Creation Units	NOTE 6 – CREATION AND REDEMPTION OF CREATION UNITS Each Fund issues and redeems shares from time to time, but only in one or more Creation Units. A Creation Unit is a block of 50,000 Shares of a Geared Fund and 25,000 Shares of a Matching VIX Fund. Creation Units may be created or redeemed only by Authorized Participants. As a result of the Share splits and reverse Share splits as described in Note 1, certain redemptions as disclosed in the Statements of Changes in Shareholders’ Equity reflect payment of fractional share balances on beneficial shareholder accounts. Except when aggregated in Creation Units, the Shares are not redeemable securities. Retail investors, therefore, generally will not be able to purchase or redeem Shares directly from or with a Fund. Rather, most retail investors will purchase or sell Shares in the secondary market with the assistance of a broker. Thus, some of the information contained in these Notes to Financial Statements—such as references to the Transaction Fees imposed on purchases and redemptions—is not relevant to retail investors. Transaction Fees on Creation and Redemption Transactions The manner by which Creation Units are purchased or redeemed is dictated by the terms of the Authorized Participant Agreement and Authorized Participant Handbook. By placing a purchase order, an Authorized Participant agrees to: (1) deposit cash with the Custodian; and (2) if permitted by the Sponsor in its sole discretion, enter into or arrange for an exchange of futures contract for related position or block trade whereby the Authorized Participant would also transfer to such Fund a number and type of exchange-traded futures contracts at or near the closing settlement price for such contracts on the purchase order date. Authorized Participants may pay a fixed transaction fee of up to $250 in connection with each order to create or redeem a Creation Unit in order to compensate BBH&Co., as the Administrator, the Custodian and the Transfer Agent of each Fund and its Shares, for services in processing the creation and redemption of Creation Units and to offset the costs of increasing or decreasing derivative positions. Authorized Participants also may pay a variable transaction fee to the Fund of up to 0.10% (and a variable transaction fee to the Matching VIX Funds of 0.05%) of the value of the Creation Unit that is purchased or redeemed unless the transaction fee is waived or otherwise adjusted by the Sponsor. The Sponsor provides such Authorized Participant with prompt notice in advance of any such waiver or adjustment of the transaction fee. Authorized Participants may sell the Shares included in the Creation Units they purchase from the Funds to other investors in the secondary market. Transaction fees for the years ended December 31, 2017, 2016 and 2015 which are included in the Addition and/or Redemption of Shares on the Statements of Changes in Shareholders’ Equity, were as follows: Fund Year Ended Year Ended Year Ended Short Euro $ — $ — $ — Short VIX Short-Term Futures ETF 1,008,452 801,564 342, 734 Ultra Bloomberg Crude Oil 610,969 504,533 847,422 Ultra Bloomberg Natural Gas 15,937 9,175 13,939 Ultra Euro — — — Ultra Gold 14,460 14,138 4,218 Ultra Silver 28,622 47,414 38,848 Ultra VIX Short-Term Futures ETF 1,036,162 1,822,247 1,391,292 Ultra Yen — — — UltraPro 3X Crude Oil ETF 25,455 — — UltraPro 3X Short Crude Oil ETF 14,096 — — UltraShort Australian Dollar — — — UltraShort Bloomberg Crude Oil 207,707 398,027 382,054 UltraShort Bloomberg Natural Gas 4,713 8,989 8,853 UltraShort Euro — — — UltraShort Gold 15,945 29,854 11,024 UltraShort Silver — 16,729 39,354 UltraShort Yen — — — VIX Mid-Term 13,605 24,056 8,521 VIX Short-Term Futures ETF 142,380 229,699 105,024 Total Trust* $ 3,138,503 $ 3,906,425 $ 3,193,283 * Amounts exclude the activity of ProShares Ultra Australian Dollar which liquidated on June 29, 2015, ProShares Managed Futures Strategy which liquidated on March 30, 2016, ProShares UltraShort Bloomberg Commodity and ProShares Ultra Bloomberg Commodity which liquidated on September 1, 2016.

Financial Highlights

Financial Highlights	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Financial Highlights	NOTE 7 – FINANCIAL HIGHLIGHTS Selected data for a Share outstanding throughout the year ended December 31, 2017: For the Year Ended December 31, 2017 Per Share Operating Performance Short Euro Short VIX Short-Term Ultra Bloomberg Ultra Bloomberg Ultra Euro Ultra Gold Net asset value, at December 31, 2016 $ 45.06 $ 45.62 $ 23.34 $ 18.85 $ 14.02 $ 32.90 Net investment income (loss) (0.14 ) (0.60 ) (0.03 ) (0.05 ) (0.04 ) (0.06 ) Net realized and unrealized gain (loss)# (4.96 ) 82.28 0.35 (12.27 ) 3.46 7.04 Change in net asset value from operations (5.10 ) 81.68 0.32 (12.32 ) 3.42 6.98 Net asset value, at December 31, 2017 $ 39.96 $ 127.30 $ 23.66 $ 6.53 $ 17.44 $ 39.88 Market value per share, at December 31, 2016† $ 45.12 $ 45.49 $ 23.36 $ 18.96 $ 14.09 $ 33.20 Market value per share, at December 31, 2017† $ 39.99 $ 128.21 $ 23.44 $ 6.50 $ 17.46 $ 40.67 Total Return, at net asset value (11.3 )% 179.0 % 1.4 % (65.4 )% 24.4 % 21.2 % Total Return, at market value (11.4 )% 181.8 % 0.3 % (65.7 )% 23.9 % 22.5 % Ratios to Average Net Assets Expense ratio 0.97 % 1.51 % 0.98 % 1.22 % 0.95 % 0.95 % Expense ratio, excluding brokerage commissions and fees 0.95 % 0.95 % 0.95 % 0.95 % 0.95 % 0.95 % Net investment income (loss) (0.32 )% (0.71 )% (0.18 )% (0.50 )% (0.23 )% (0.14 )% * See Note 1 of these Notes to Financial Statements. # The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period. † Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds’ net asset value is calculated. For the Year Ended December 31, 2017 Per Share Operating Performance Ultra Silver Ultra VIX Short-Term Ultra Yen UltraPro 3X Crude UltraPro 3X Short UltraShort Net asset value, at December 31, 2016 $ 33.44 $ 173.93 $ 55.43 $ 25.00 $ 25.00 $ 55.38 Net investment income (loss) (0.05 ) (0.33 ) (0.24 ) (0.21 ) (0.17 ) (0.17 ) Net realized and unrealized gain (loss)# 0.16 (163.27 ) 2.13 12.99 (14.25 ) (9.54 ) Change in net asset value from operations 0.11 (163.60 ) 1.89 12.78 (14.42 ) (9.71 ) Net asset value, at December 31, 2017 $ 33.55 $ 10.33 $ 57.32 $ 37.78 $ 10.58 $ 45.67 Market value per share, at December 31, 2016† $ 32.09 $ 175.00 $ 55.52 $ 25.00 $ 25.00 $ 55.24 Market value per share, at December 31, 2017† $ 33.85 $ 10.21 $ 57.45 $ 37.23 $ 10.72 $ 45.72 Total Return, at net asset value 0.3 % (94.1 )% 3.4 % 51.1 %^ (57.7 )%^ (17.5 )% Total Return, at market value 5.5 % (94.2 )% 3.5 % 48.9 %^ (57.1 )%^ (17.2 )% Ratios to Average Net Assets Expense ratio 0.95 % 1.90 % 0.95 % 1.30 %** 1.32 %** 1.02 % Expense ratio, excluding brokerage commissions and fees 0.95 % 0.95 % 0.95 % 0.95 %** 0.95 %** 0.95 % Net investment income (loss) (0.15 )% (1.17 )% (0.41 )% (1.20 )%** (1.25 )%** (0.36 )% * See Note 1 of these Notes to Financial Statements. + From commencement of operations, March 24, 2017 through December 31, 2017. # The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period. † Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds’ net asset value is calculated. For ProShares UltraPro 3x Crude Oil ETF and ProShares UltraPro 3x Short Crude Oil ETF, the returns of shares outstanding for the period from commencement of operations through December 31, 2017 are calculated based on the initial offering price upon commencement of operations of $25.00. ^ Percentages are not annualized for the period ended December 31, 2017. ** Percentages are annualized. For the Year Ended December 31, 2017 Per Share Operating Performance UltraShort UltraShort UltraShort Euro UltraShort Gold UltraShort UltraShort Yen Net asset value, at December 31, 2016 $ 31.70 $ 23.10 $ 27.08 $ 91.33 $ 37.31 $ 80.24 Net investment income (loss) (0.06 ) (0.27 ) (0.04 ) (0.13 ) (0.06 ) (0.14 ) Net realized and unrealized gain (loss)# (7.33 ) 16.65 (5.83 ) (20.73 ) (5.54 ) (5.17 ) Change in net asset value from operations (7.39 ) 16.38 (5.87 ) (20.86 ) (5.60 ) (5.31 ) Net asset value, at December 31, 2017 $ 24.31 $ 39.48 $ 21.21 $ 70.47 $ 31.71 $ 74.93 Market value per share, at December 31, 2016† $ 31.65 $ 23.05 $ 27.08 $ 90.54 $ 38.76 $ 80.25 Market value per share, at December 31, 2017† $ 24.56 $ 39.65 $ 21.20 $ 69.11 $ 31.40 $ 74.98 Total Return, at net asset value (23.3 )% 70.9 % (21.7 )% (22.8 )% (15.0 )% (6.6 )% Total Return, at market value (22.4 )% 72.0 % (21.7 )% (23.7 )% (19.0 )% (6.6 )% Ratios to Average Net Assets Expense ratio 0.99 % 1.39 % 0.95 % 0.95 % 0.95 % 0.95 % Expense ratio, excluding brokerage commissions and fees 0.95 % 0.95 % 0.95 % 0.95 % 0.95 % 0.95 % Net investment income (loss) (0.17 )% (0.81 )% (0.15 )% (0.17 )% (0.18 )% (0.19 )% # The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period. † Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds’ net asset value is calculated. For the Year Ended December 31, 2017 Per Share Operating Performance VIX Mid-Term VIX Short-Term Net asset value, at December 31, 2016 $ 42.14 $ 84.86 Net investment income (loss) (0.06 ) (0.07 ) Net realized and unrealized gain (loss)# (20.79 ) (61.45 ) Change in net asset value from operations (20.85 ) (61.52 ) Net asset value, at December 31, 2017 $ 21.29 $ 23.34 Market value per share, at December 31, 2016† $ 42.34 $ 85.04 Market value per share, at December 31, 2017† $ 21.15 $ 23.15 Total Return, at net asset value (49.5 )% (72.5 )% Total Return, at market value (50.0 )% (72.8 )% Ratios to Average Net Assets Expense ratio 0.91 % 0.96 % Expense ratio, excluding brokerage commissions and fees 0.85 % 0.85 % Net investment income (loss) (0.22 )% (0.18 )% * See Note 1 of these Notes to Financial Statements. # The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period. † Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds’ net asset value is calculated. Selected data for a Share outstanding throughout the year ended December 31, 2016: For the Year Ended December 31, 2016 Per Share Operating Performance Short Euro Short VIX Short-Term Ultra Bloomberg Ultra Bloomberg Ultra Euro Ultra Gold Net asset value, at December 31, 2015 $ 43.78 $ 25.41 $ 25.15 $ 18.57 $ 15.51 $ 29.73 Net investment income (loss) (0.33 ) (0.30 ) (0.15 ) (0.16 ) (0.11 ) (0.28 ) Net realized and unrealized gain (loss)# 1.61 20.51 (1.66 ) 0.44 (1.38 ) 3.45 Change in net asset value from operations 1.28 20.21 (1.81 ) 0.28 (1.49 ) 3.17 Net asset value, at December 31, 2016 $ 45.06 $ 45.62 $ 23.34 $ 18.85 $ 14.02 $ 32.90 Market value per share, at December 31, 2015† $ 43.74 $ 25.23 $ 25.08 $ 18.48 $ 15.51 $ 29.73 Market value per share, at December 31, 2016† $ 45.12 $ 45.49 $ 23.36 $ 18.96 $ 14.09 $ 33.20 Total Return, at net asset value 2.9 % 79.5 % (7.2 )% 1.5 % (9.6 )% 10.7 % Total Return, at market value 3.2 % 80.3 % (6.9 )% 2.6 % (9.2 )% 11.7 % Ratios to Average Net Assets Expense ratio 0.97 % 1.39 % 1.01 % 1.34 % 0.95 % 0.95 % Expense ratio, excluding brokerage commissions 0.95 % 0.95 % 0.95 % 0.95 % 0.95 % 0.95 % Net investment income (loss) (0.76 )% (1.15 )% (0.76 )% (1.12 )% (0.71 )% (0.69 )% * See Note 1 of these Notes to Financial Statements. # The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period. † Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds’ net asset value is calculated. For the Year Ended December 31, 2016 Per Share Operating Performance Ultra Silver Ultra VIX Ultra Yen UltraShort UltraShort UltraShort Net asset value, at December 31, 2015 $ 27.06 $ 2,808.40 $ 54.75 $ 58.46 $ 66.60 $ 46.53 Net investment income (loss) (0.27 ) (7.68 ) (0.45 ) (0.43 ) (0.36 ) (0.68 ) Net realized and unrealized gain (loss)# 6.65 (2,626.79 ) 1.13 (2.65 ) (34.54 ) (22.75 ) Change in net asset value from operations 6.38 (2,634.47 ) 0.68 (3.08 ) (34.90 ) (23.43 ) Net asset value, at December 31, 2016 $ 33.44 $ 173.93 $ 55.43 $ 55.38 $ 31.70 $ 23.10 Market value per share, at December 31, 2015† $ 27.08 $ 2,835.00 $ 54.70 $ 58.15 $ 66.82 $ 46.55 Market value per share, at December 31, 2016† $ 32.09 $ 175.00 $ 55.52 $ 55.24 $ 31.65 $ 23.05 Total Return, at net asset value 23.6 % (93.8 )% 1.2 % (5.3 )% (52.4 )% (50.4 )% Total Return, at market value 18.5 % (93.8 )% 1.5 % (5.0 )% (52.6 )% (50.5 )% Ratios to Average Net Assets Expense ratio 0.95 % 1.57 % 0.95 % 1.03 % 1.03 % 1.65 % Expense ratio, excluding brokerage commissions 0.95 % 0.85 % 0.95 % 0.95 % 0.95 % 0.95 % Net investment income (loss) (0.69 )% (1.32 )% (0.69 )% (0.79 )% (0.76 )% (1.43 )% * See Note 1 of these Notes to Financial Statements. # The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period. † Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds’ net asset value is calculated. For the Year Ended December 31, 2016 Per Share Operating Performance UltraShort Euro UltraShort Gold UltraShort UltraShort Yen VIX Mid-Term VIX Short-Term Net asset value, at December 31, 2015 $ 25.54 $ 115.88 $ 64.58 $ 87.94 $ 53.96 $ 264.84 Net investment income (loss) (0.17 ) (0.55 ) (0.26 ) (0.50 ) (0.33 ) (1.10 ) Net realized and unrealized gain (loss)# 1.71 (24.00 ) (27.01 ) (7.20 ) (11.49 ) (178.88 ) Change in net asset value from operations 1.54 (24.55 ) (27.27 ) (7.70 ) (11.82 ) (179.98 ) Net asset value, at December 31, 2016 $ 27.08 $ 91.33 $ 37.31 $ 80.24 $ 42.14 $ 84.86 Market value per share, at December 31, 2015† $ 25.53 $ 115.83 $ 64.55 $ 87.89 $ 53.99 $ 266.60 Market value per share, at December 31, 2016† $ 27.08 $ 90.54 $ 38.76 $ 80.25 $ 42.34 $ 85.04 Total Return, at net asset value 6.0 % (21.2 )% (42.2 )% (8.8 )% (21.9 )% (68.0 )% Total Return, at market value 6.1 % (21.8 )% (40.0 )% (8.7 )% (21.6 )% (68.1 )% Ratios to Average Net Assets Expense ratio 0.95 % 0.95 % 0.95 % 0.95 % 0.93 % 0.99 % Expense ratio, excluding brokerage commissions 0.95 % 0.95 % 0.95 % 0.95 % 0.85 % 0.85 % Net investment income (loss) (0.70 )% (0.70 )% (0.70 )% (0.71 )% (0.68 )% (0.75 )% * See Note 1 of these Notes to Financial Statements. # The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period. † Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds’ net asset value is calculated. Selected data for a Share outstanding throughout the year ended December 31, 2015 For the Year Ended December 31, 2015 Per Share Operating Performance Short Euro Short VIX Short-Term Ultra Bloomberg Ultra Bloomberg Ultra Euro Ultra Gold Net asset value, at December 31, 2014 $ 40.06 $ 30.70 $ 101.48 $ 61.65 $ 19.87 $ 40.00 Net investment income (loss) (0.40 ) (0.41 ) (0.56 ) (0.50 ) (0.15 ) (0.33 ) Net realized and unrealized gain (loss)# 4.12 (4.88 ) (75.77 ) (42.58 ) (4.21 ) (9.94 ) Change in net asset value from operations 3.72 (5.29 ) (76.33 ) (43.08 ) (4.36 ) (10.27 ) Net asset value, at December 31, 2015 $ 43.78 $ 25.41 $ 25.15 $ 18.57 $ 15.51 $ 29.73 Market value per share, at December 31, 2014† $ 40.03 $ 30.58 $ 103.70 $ 63.12 $ 19.80 $ 38.41 Market value per share, at December 31, 2015† $ 43.74 $ 25.23 $ 25.08 $ 18.48 $ 15.51 $ 29.73 Total Return, at net asset value 9.3 % (17.2 )% (75.2 )% (69.9 )% (22.0 )% (25.7 )% Total Return, at market value 9.3 % (17.5 )% (75.8 )% (70.7 )% (21.7 )% (22.6 )% Ratios to Average Net Assets Expense ratio 0.97 % 1.40 % 1.02 % 1.29 % 0.95 % 0.95 % Expense ratio, excluding brokerage commissions 0.95 % 0.95 % 0.95 % 0.95 % 0.95 % 0.95 % Net investment income (loss) (0.95 )% (1.36 )% (0.98 )% (1.26 )% (0.93 )% (0.90 )% * See Note 1 of these Notes to Financial Statements. # The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period. † Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds’ net asset value is calculated. For the Year Ended December 31, 2015 Per Share Operating Performance Ultra Silver Ultra VIX Ultra Yen* UltraShort UltraShort UltraShort Net asset value, at December 31, 2014 $ 39.37 $ 12,546.00 $ 56.47 $ 51.38 $ 38.99 $ 27.99 Net investment income (loss) (0.33 ) (72.24 ) (0.48 ) (0.57 ) (0.39 ) (0.44 ) Net realized and unrealized gain (loss)# (11.98 ) (9,665.36 ) (1.24 ) 7.65 28.00 18.98 Change in net asset value from operations (12.31 ) (9,737.60 ) (1.72 ) 7.08 27.61 18.54 Net asset value, at December 31, 2015 $ 27.06 $ 2,808.40 $ 54.75 $ 58.46 $ 66.60 $ 46.53 Market value per share, at December 31, 2014† $ 38.05 $ 12,575.00 $ 56.48 $ 51.37 $ 38.26 $ 27.34 Market value per share, at December 31, 2015† $ 27.07 $ 2,835.00 $ 54.70 $ 58.15 $ 66.82 $ 46.53 Total Return, at net asset value (31.3 )% (77.6 )% (3.0 )% 13.8 % 70.8 % 66.3 % Total Return, at market value (28.8 )% (77.5 )% (3.2 )% 13.2 % 74.6 % 70.3 % Ratios to Average Net Assets Expense ratio 0.95 % 1.65 % 0.95 % 1.03 % 1.07 % 1.55 % Expense ratio, excluding brokerage commissions 0.95 % 0.95 % 0.95 % 0.95 % 0.95 % 0.95 % Net investment income (loss) (0.89 )% (1.61 )% (0.88 )% (1.00 )% (1.04 )% (1.50 )% * See Note 1 of these Notes to Financial Statements. # Percentages The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period. † Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds’ net asset value is calculated. For the Year Ended December 31, 2015 Per Share Operating Performance UltraShort Euro UltraShort Gold UltraShort UltraShort Yen VIX Mid-Term VIX Short-Term Net asset value, at December 31, 2014 $ 21.59 $ 96.65 $ 57.81 $ 89.33 $ 63.60 $ 418.64 Net investment income (loss) (0.22 ) (0.91 ) (0.50 ) (0.82 ) (0.51 ) (2.65 ) Net realized and unrealized gain (loss)# 4.17 20.14 7.27 (0.57 ) (9.13 ) (151.15 ) Change in net asset value from operations 3.95 19.23 6.77 (1.39 ) (9.64 ) (153.80 ) Net asset value, at December 31, 2015 $ 25.54 $ 115.88 $ 64.58 $ 87.94 $ 53.96 $ 264.84 Market value per share, at December 31, 2014† $ 21.61 $ 100.22 $ 59.70 $ 89.30 $ 63.89 $ 419.80 Market value per share, at December 31, 2015† $ 25.53 $ 115.83 $ 64.55 $ 87.89 $ 53.99 $ 266.60 Total Return, at net asset value 18.3 % 19.9 % 11.7 % (1.6 )% (15.2 )% (36.7 )% Total Return, at market value 18.1 % 15.6 % 8.1 % (1.6 )% (15.5 )% (36.5 )% Ratios to Average Net Assets Expense ratio 0.95 % 0.95 % 0.95 % 0.95 % 0.91 % 0.95 % Expense ratio, excluding brokerage commissions 0.95 % 0.95 % 0.95 % 0.95 % 0.85 % 0.85 % Net investment income (loss) (0.90 )% (0.91 )% (0.91 )% (0.92 )% (0.88 )% (0.92 )% * See Note 1 of these Notes to Financial Statements. # The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period. † Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds’ net asset value is calculated.

Risk

Risk	12 Months Ended
	Dec. 31, 2017
Risks and Uncertainties [Abstract]
Risk	NOTE 8 – RISK Correlation and Compounding Risk The Geared Funds do not seek to achieve their stated investment objective over a period of time greater than a single day (as measured from NAV calculation time to NAV calculation time). The return of a Geared Fund for a period longer than a single day is the result of its return for each day compounded over the period and usually will differ from the inverse (-1x), (-2x), (-3x), Each Ultra, UltraShort, UltraPro and UltraPro Short Fund uses leverage and should produce daily returns that are more volatile than that of its benchmark. For example, the daily return of an Ultra or UltraPro Fund with a 2x or 3x multiple should be approximately two or three times as volatile on a daily basis as is the return of a fund with an objective of matching the same benchmark. The daily return of a Short, UltraShort or UltraPro Short Fund is designed to return the inverse (-1x), (-2x) (-3x) While the Funds expect to meet their investment objectives, several factors may affect their ability to do so. Among these factors are: (1) the Sponsor’s ability to purchase and sell Financial Instruments in a manner that correlates to a Fund’s objective; (2) an imperfect correlation between the performance of Financial Instruments held by a Fund and the performance of the applicable benchmark; (3) bid-ask A number of factors may affect a Geared Fund’s ability to achieve a high degree of correlation with its benchmark, and there can be no guarantee that a Fund will achieve a high degree of correlation. Failure to achieve a high degree of correlation may prevent a Geared Fund from achieving its investment objective. In order to achieve a high degree of correlation with their underlying benchmarks, the Geared Funds seek to rebalance their portfolios daily to keep exposure consistent with their investment objectives. Being materially under- or over-exposed to the benchmark may prevent such Geared Funds from achieving a high degree of correlation with such benchmark. Market disruptions or closure, large amounts of assets into or out of the Geared Funds, regulatory restrictions or extreme market volatility will adversely affect such Funds’ ability to adjust exposure to requisite levels. The target amount of portfolio exposure is impacted dynamically by the benchmarks’ movements during each day. Because of this, it is unlikely that the Geared Funds will be perfectly exposed ( i.e., -1x, -2x, -3x In addition, unlike other funds that do not rebalance their portfolios as frequently, each Geared Fund may be subject to increased trading costs associated with daily portfolio rebalancing in order to maintain appropriate exposure to the underlying benchmarks. Counterparty Risk Certain of the Funds will use swap agreements and/or forward contracts as a means to achieve their respective investment objectives. Such Funds will use either swap agreements and/or forward contracts referencing their respective benchmarks. These Funds may also invest in other swap agreements or forward contracts if such instruments tend to exhibit trading prices or returns that correlate with the benchmark or a component of the benchmark and will further the investment objective of the Fund. Certain Funds may invest in swap agreements or forward contracts if position accountability rules or position limits or margin limits are reached with respect to specific futures contracts or the market for a specific futures contract experiences emergencies ( e.g. e.g. Swap agreements and forward contracts are generally traded in OTC markets and have only recently become subject to regulation by the CFTC. CFTC rules, however, do not cover all types of swap agreements and forward contracts. Investors, therefore, may not receive the protection of CFTC regulation or the statutory scheme of the Commodity Exchange Act (the “CEA”) in connection with each Fund’s swap agreements or forward contracts. The lack of regulation in these markets could expose investors to significant losses under certain circumstances, including in the event of trading abuses or financial failure by participants. The Funds will be subject to credit risk with respect to the counterparties to the derivatives contracts (whether a clearing corporation in the case of cleared instruments or another third party in the case of OTC uncleared instruments). Unlike in futures contracts, the counterparty to uncleared swap agreements or forward contracts is generally a single bank or other financial institution, rather than a clearing organization backed by a group of financial institutions. As a result, a Fund is subject to credit risk with respect to the amount it expects to receive from counterparties to uncleared swaps and forward contracts entered into as part of that Fund’s principal investment strategy. If a counterparty becomes bankrupt or otherwise fails to perform its obligations due to financial difficulties, a Fund could suffer significant losses on these contracts and the value of an investor’s investment in a Fund may decline. The Funds have sought to mitigate these risks by generally requiring that the counterparties for each Fund agree to post collateral for the benefit of the Fund, marked to market daily, subject to certain minimum thresholds; however there are no limitations on the percentage of its assets each Fund may invest in swap agreements or forward contracts with a particular counterparty. To the extent any such collateral is insufficient or there are delays in accessing the collateral, the Funds will be exposed to counterparty risk as described above, including possible delays in recovering amounts as a result of bankruptcy proceedings. The Funds typically enter into transactions only with major global financial institutions. OTC swaps or forward contracts are less liquid than futures contracts because they are not traded on an exchange, do not have uniform terms and conditions, and are generally entered into based upon the creditworthiness of the parties and the availability of credit support, such as collateral, and in general, are not transferable without the consent of the counterparty. If the level of the Fund’s benchmark has a dramatic intraday move that would cause a material decline in the Fund’s NAV, the terms of the swap may permit the counterparty to immediately close out the transaction with the Fund. In that event, it may not be possible for the Fund to enter into another swap agreement or to invest in other Financial Instruments necessary to achieve the desired exposure consistent with the Fund’s objective. This, in turn, may prevent the Fund from achieving its investment objective, particularly if the level of the Fund’s benchmark reverses all or part of its intraday move by the end of the day. In addition, cleared derivative transactions benefit from daily marking-to-market Each counterparty and/or any of its affiliates may be an Authorized Participant or shareholder of a Fund. The counterparty risk for cleared derivative transactions is generally lower than for uncleared OTC derivatives since generally a clearing organization becomes substituted for each counterparty to a cleared derivative contract and, in effect, guarantees the parties’ performance under the contract as each party to a trade looks only to the clearing house for performance of financial obligations. However, there can be no assurance that the clearing house, or its members, will satisfy its obligations to the Fund. Leverage Risk The Leveraged Funds may utilize leverage in seeking to achieve their respective investment objectives and will lose more money in market environments adverse to their respective daily investment objectives than funds that do not employ leverage. The use of leveraged and/or inverse leveraged positions could result in the total loss of an investor’s investment. For example, because the UltraShort Funds and Ultra Funds include a two times the inverse (-2x), or single-day (-3x) single-day single-day single-day Liquidity Risk Financial Instruments cannot always be liquidated at the desired price. It is difficult to execute a trade at a specific price when there is a relatively small volume of buy and sell orders in a market. A market disruption can also make it difficult to liquidate a position or find a swap or forward contract counterparty at a reasonable cost. Market illiquidity may cause losses for the Funds. The large size of the positions which the Funds may acquire increases the risk of illiquidity by both making their positions more difficult to liquidate and increasing the losses incurred while trying to do so. Any type of disruption or illiquidity will potentially be exacerbated due to the fact that the Funds will typically invest in Financial Instruments related to one benchmark, which in many cases is highly concentrated. “Contango” and “Backwardation” Risk In Funds that hold futures contracts, as the futures contracts near expiration, they are generally replaced by contracts that have a later expiration. Thus, for example, a contract purchased and held in November 2016 may specify a January 2017 expiration. As that contract nears expiration, it may be replaced by selling the January 2017 contract and purchasing the contract expiring in March 2017. This process is referred to as “rolling.” Rolling may have a positive or negative impact on performance. For example, historically, the prices of certain types of futures contracts have frequently been higher for contracts with shorter-term expirations than for contracts with longer-term expirations, which is referred to as “backwardation.” In these circumstances, absent other factors, the sale of the January 2017 contract would take place at a price that is higher than the price at which the March 2017 contract is purchased, thereby creating a gain in connection with rolling. While certain types of futures contracts have historically exhibited consistent periods of backwardation, backwardation will likely not exist in these markets at all times. The presence of contango (where prices of contracts are higher in the distant delivery months than in the nearer delivery months due to the costs of long-term storage of a physical commodity prior to delivery or other factors) in certain futures contracts at the time of rolling would be expected to adversely affect an Ultra Fund, an UltraPro Fund or a Matching VIX Fund that invests in such futures, and positively affect a Short Fund, an UltraShort Fund or an UltraPro Short Fund that invests in such futures. Similarly, the presence of backwardation in certain futures contracts at the time of rolling such contracts would be expected to adversely affect the Short Funds, UltraShort Funds, and UltraPro Short Funds, and positively affect the Ultra Funds, UltraPro Funds and Matching VIX Funds. Since the introduction of VIX futures contracts, there have frequently been periods where VIX futures prices reflect higher expected volatility levels further out in time. This can result in a loss from “rolling” the VIX futures to maintain the constant weighted average maturity of the applicable VIX Futures Index. Losses from exchanging a lower priced VIX future for a higher priced longer-term future in the rolling process would adversely affect the value of each VIX Futures Index and, accordingly, decrease the return of the Ultra VIX Short-Term Futures ETF and the Matching VIX Funds. Gold and silver historically exhibit persistent “contango” markets rather than backwardation. Natural gas, like crude oil, moves in and out of backwardation and contango but historically has been in contango most commonly. It is generally believed this is because the market needs to build inventories for most of the year in order to have enough storage to make it through a normal winter. Periods of backwardation are typically thought to be caused by demand shocks or supply shortages such as an unusually cold winter or a hurricane.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	NOTE 9 – SUBSEQUENT EVENTS Effective as of close of business on February 27, 2018, the investment objective of ProShares Ultra VIX Short-Term Futures ETF and ProShares Short VIX Short-Term Futures ETF changed. ProShares Ultra VIX Short-Term Futures ETF ProShares Short VIX Short-Term Futures ETF Certain regulatory approvals will be required for the Funds to permanently pursue these new investment objectives. In the event that such approvals are not obtained, the Funds will consider other courses of action.

Significant Accounting Polici17

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Use of Estimates & Indemnifications	Use of Estimates & Indemnifications The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. In the normal course of business, the Trust enters into contracts that contain a variety of representations which provide general indemnifications. The Trust’s maximum exposure under these arrangements cannot be known; however, the Trust expects any risk of loss to be remote.
Basis of Presentation	Basis of Presentation Pursuant to rules and regulations of the U.S. Securities and Exchange Commission (“SEC”), audited financial statements are presented for the Trust as a whole, as the SEC registrant, and for each Fund individually. The debts, liabilities, obligations and expenses incurred, contracted for or otherwise existing with respect to a particular Fund shall be enforceable only against the assets of such Fund and not against the assets of the Trust generally or any other Fund. Accordingly, the assets of one Fund of the Trust include only those funds and other assets that are paid to, held by or distributed to the Trust for the purchase of Shares in that Fund.
Statement of Cash Flows	Statement of Cash Flows The cash amount shown in the Statements of Cash Flows is the amount reported as cash in the Statement of Financial Condition dated December 31, 2017 and 2016, and represents non-segregated
Final Net Asset Value for Fiscal Period	Final Net Asset Value for Fiscal Period The cut-off Create/Redeem Cut-off* NAV Calculation Time NAV Calculation Date UltraShort Silver, Ultra Silver 6:30 a.m. 7:00 a.m. December 29 UltraShort Gold, Ultra Gold 9:30 a.m. 10:00 a.m. December 29 UltraShort Bloomberg Crude Oil, Ultra Bloomberg Crude Oil, 2:00 p.m. 2:30 p.m. December 29 UltraPro 3x Short Crude Oil, UltraPro 3x Crude Oil ETF UltraShort Bloomberg Natural Gas, Ultra Bloomberg Natural Gas 2:00 p.m. 2:30 p.m. December 29 UltraShort Australian Dollar 3:00 p.m. 4:00 p.m. December 29 Short Euro UltraShort Euro, Ultra Euro 3:00 p.m. 4:00 p.m. December 29 UltraShort Yen, Ultra Yen 3:00 p.m. 4:00 p.m. December 29 VIX Short-Term Futures ETF, Ultra VIX Short-Term Futures ETF, Short VIX Short-Term Futures ETF 2:00 p.m. 4:15 p.m. December 29 VIX Mid-Term 2:00 p.m. 4:15 p.m. December 29 * Although the Funds’ shares may continue to trade on secondary markets subsequent to the calculation of the final NAV, these times represent the final opportunity to transact in creation or redemption units for the year ended December 31, 2017. Market value per Share is determined at the close of the NYSE Arca and may be later than when the Funds’ NAV per Share is calculated. For financial reporting purposes, the Funds value transactions based upon the final closing price in their primary markets. Accordingly, the investment valuations in these financial statements may differ from those used in the calculation of certain of the Funds’ final creation/redemption NAV for the year ended December 31, 2017.
Investment Valuation	Investment Valuation Short-term investments are valued at amortized cost which approximates fair value for daily NAV purposes. For financial reporting purposes, short-term investments are valued at their market price using information provided by a third-party pricing service or market quotations. In each of these situations, valuations are typically categorized as Level I in the fair value hierarchy. Derivatives ( e.g. non-exchange-traded Fair value pricing may require subjective determinations about the value of an investment. While the Funds’ policies are intended to result in a calculation of its respective Fund’s NAV that fairly reflects investment values as of the time of pricing, such Fund cannot ensure that fair values determined by the Sponsor or persons acting at their direction would accurately reflect the price that a Fund could obtain for an investment if it were to dispose of that investment as of the time of pricing (for instance, in a forced or distressed sale). The prices used by such Fund may differ from the value that would be realized if the investments were sold and the differences could be material to the financial statements.
Fair Value of Financial Instruments	Fair Value of Financial Instruments The Funds disclose the fair value of their investments in a hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The disclosure requirements establish a fair value hierarchy that distinguishes between: (1) market participant assumptions developed based on market data obtained from sources independent of the Funds (observable inputs); and (2) the Funds’ own assumptions about market participant assumptions developed based on the best information available under the circumstances (unobservable inputs). The three levels defined by the disclosure requirements hierarchy are as follows: Level I – Quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date. Level II – Inputs other than quoted prices included within Level I that are observable for the asset or liability, either directly or indirectly. Level II assets include the following: quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability, and inputs that are derived principally from or corroborated by observable market data by correlation or other means (market-corroborated inputs). Level III – Unobservable pricing input at the measurement date for the asset or liability. Unobservable inputs shall be used to measure fair value to the extent that observable inputs are not available. In some instances, the inputs used to measure fair value might fall in different levels of the fair value hierarchy. The level in the fair value hierarchy within which the fair value measurement in its entirety falls is determined based on the lowest input level that is significant to the fair value measurement in its entirety. Fair value measurements also require additional disclosure when the volume and level of activity for the asset or liability have significantly decreased, as well as when circumstances indicate that a transaction is not orderly. The following table summarizes the valuation of investments at December 31, 2017 using the fair value hierarchy: Level I - Quoted Prices Level II - Other Significant Observable Inputs Short-Term U.S. Futures Forward Foreign Swap Total Short Euro $ 6,996,235 $ (166,288 ) $ — $ — $ — $ 6,829,947 Short VIX Short-Term Futures ETF 494,910,644 17,041,449 — — — 511,952,093 Ultra Bloomberg Crude Oil 459,515,902 11,945,979 — — 62,238,361 533,700,242 Ultra Bloomberg Natural Gas 50,961,356 7,225,810 — — — 58,187,166 Ultra Euro 6,996,235 — — 264,152 — 7,260,387 Ultra Gold 88,884,844 5,480 3,646,355 — — 92,536,679 Ultra Silver 235,581,716 1,600 21,735,334 — — 257,318,650 Ultra VIX Short-Term Futures ETF 287,533,132 (34,466,120 ) — — — 253,067,012 Ultra Yen 1,997,933 — — (34,824 ) — 1,963,109 UltraShort Australian Dollar 11,983,904 (893,220 ) — — — 11,090,684 UltraPro 3X Crude Oil ETF — 1,417,998 — — — 1,417,998 UltraPro 3X Short Crude Oil ETF — (2,988,155 ) — — — (2,988,155 ) UltraShort Bloomberg Crude Oil 253,646,823 (3,962,648 ) — — (30,607,142 ) 219,077,033 UltraShort Bloomberg Natural Gas 3,999,751 (1,097,049 ) — — — 2,902,702 UltraShort Euro 204,770,166 — — (6,344,269 ) — 198,425,897 UltraShort Gold 31,977,900 (5,460 ) (1,488,259 ) — — 30,484,181 UltraShort Silver 18,349,861 (1,650 ) (1,716,163 ) — — 16,632,048 UltraShort Yen 131,834,352 — — 1,527,263 — 133,361,615 VIX Mid-Term 20,993,515 (2,215,280 ) — — — 18,778,235 VIX Short-Term Futures ETF 134,845,604 (4,761,877 ) — — — 130,083,727 Total Trust $ 2,445,779,873 $ (12,919,431 ) $ 22,177,267 $ (4,587,678 ) $ 31,631,219 $ 2,482,081,250 * Includes cumulative appreciation/depreciation of futures contracts as reported in the Schedules of Investments. Only current day’s variation margin is reported within the Statements of Financial Condition in receivable/payable on open futures. At December 31, 2017, there were no Level III portfolio investments for which significant unobservable inputs were used to determine fair value. The Funds’ policy is to recognize transfers between valuation levels at the end of the reporting period. At December 31, 2017, there were no significant transfers in or out of Level I and Level II fair value measurements. The inputs or methodology used for valuing investments are not necessarily an indication of the risk associated with investing in those securities. The following table summarizes the valuation of investments at December 31, 2016 using the fair value hierarchy: Level I - Quoted Prices Level II - Other Significant Observable Inputs Short-Term U.S. Futures Forward Foreign Swap Total Short Euro $ 13,164,828 $ 132,900 $ — $ — $ — $ 13,297,728 Short VIX Short-Term Futures ETF 170,396,436 (10,309,611 ) — — — 160,086,825 Ultra Bloomberg Crude Oil 885,050,007 5,537,165 — — 55,358,571 945,945,743 Ultra Bloomberg Natural Gas 36,183,648 2,536,720 — — — 38,720,368 Ultra Euro 11,891,831 — — (574,010 ) — 11,317,821 Ultra Gold 95,356,621 (18,960 ) (4,431,107 ) — — 90,906,554 Ultra Silver 295,300,799 (27,360 ) (20,976,189 ) — — 274,297,250 Ultra VIX Short-Term Futures ETF 434,671,795 (7,972,237 ) — — — 426,699,558 Ultra Yen 5,282,879 — — (342,076 ) — 4,940,803 UltraShort Australian Dollar 12,909,619 1,182,340 — — — 14,091,959 UltraShort Bloomberg Crude Oil 205,694,385 (1,426,815 ) — — (12,206,881 ) 192,060,689 UltraShort Bloomberg Natural Gas 2,899,151 (482,031 ) — — — 2,417,120 UltraShort Euro 337,375,787 — — 16,162,931 — 353,538,718 UltraShort Gold 60,540,555 18,980 3,033,566 — — 63,593,101 UltraShort Silver 21,550,319 27,310 1,384,246 — — 22,961,875 UltraShort Yen 257,102,313 — — 16,744,937 — 273,847,250 VIX Mid-Term 45,486,235 (1,288,245 ) — — — 44,197,990 VIX Short-Term Futures ETF 147,991,233 (468,652 ) — — — 147,522,581 Total Trust $ 3,038,848,441 $ (12,558,496 ) $ (20,989,484 ) $ 31,991,782 $ 43,151,690 $ 3,080,443,933 * Includes cumulative appreciation/depreciation of futures contracts as reported in the Schedules of Investments. Only current day’s variation margin is reported within the Statements of Financial Condition in receivable/payable on open futures. At December 31, 2016, there were no Level III portfolio investments for which significant unobservable inputs were used to determine fair value. The Funds’ policy is to recognize transfers between valuation levels at the end of the reporting period. At December 31, 2016, there were no significant transfers in or out of Level I and Level II fair value measurements. The inputs or methodology used for valuing investments are not necessarily an indication of the risk associated with investing in those securities.
Investment Transactions and Related Income	Investment Transactions and Related Income Investment transactions are recorded on the trade date. All such transactions are recorded on the identified cost basis and marked to market daily. Unrealized appreciation/depreciation on open contracts are reflected in the Statements of Financial Condition and changes in the unrealized appreciation/depreciation between periods are reflected in the Statements of Operations. Discounts on short-term securities purchased are amortized and reflected as Interest Income in the Statements of Operations.
Brokerage Commissions and Fees	Brokerage Commissions and Fees Each Fund pays its respective brokerage commissions, including applicable exchange fees, National Futures Association (“NFA”) fees, give-up recognized on a half-turn basis (e.g., the first half is recognized when the contract is purchased (opened) and the second half is recognized when the transaction is closed). The Sponsor is currently paying brokerage commissions on VIX futures contracts for the Matching VIX Funds that exceed variable create/redeem fees collected by more than 0.02% of the Matching VIX Fund’s average net assets annually.
Federal Income Tax	Federal Income Tax Each Fund is registered as a series of a Delaware statutory trust and is treated as a partnership for U.S. federal income tax purposes. Accordingly, no Fund expects to incur U.S. federal income tax liability; rather, each beneficial owner of a Fund’s Shares is required to take into account its allocable share of its Fund’s income, gain, loss, deductions and other items for its Fund’s taxable year ending with or within the beneficial owner’s taxable year. Management of the Funds has reviewed all open tax years and major jurisdictions ( i.e. on-going
New Accounting Pronouncements	New Accounting Pronouncements In November 2016, the FASB issued Accounting Standards Update No. 2016-18, 2016-18”),

Organization (Tables)

Organization (Tables)	12 Months Ended
	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Share Splits and Reverse Share Splits	The table below includes Share splits and reverse Share splits for the Funds during the years ended December 31, 2015, 2016 and 2017. The ticker symbols for these Funds did not change, and each Fund continues to trade on the NYSE Arca. Fund Execution Date (Prior to Opening of Trading) Type of Split Date Trading Resumed at Post- Split Price ProShares Ultra VIX Short-Term Futures ETF May 20, 2015 1-for-5 reverse Share split May 20, 2015 ProShares Ultra Bloomberg Crude Oil May 20, 2015 1-for-5 reverse Share split May 20, 2015 ProShares Ultra Bloomberg Natural Gas May 20, 2015 1-for-4 May 20, 2015 ProShares Ultra Yen May 20, 2015 1-for-4 May 20, 2015 ProShares UltraShort Silver November 13, 2015 2-for-1 November 13, 2015 ProShares UltraShort Bloomberg Natural Gas July 20, 2016 3-for-1 July 25, 2016 ProShares VIX Short-Term Futures ETF July 25, 2016 1-for-5 July 25, 2016 ProShares Ultra VIX Short-Term Futures ETF July 25, 2016 1-for-5 July 25, 2016 ProShares UltraShort Bloomberg Crude Oil January 11, 2017 2-for-1 January 12, 2017 ProShares Ultra Bloomberg Crude Oil January 11, 2017 1-for-2 January 12, 2017 ProShares Ultra VIX Short-Term Futures ETF January 11, 2017 1-for-5 January 12, 2017 ProShares Short VIX Short-Term Futures ETF July 12, 2017 2-for-1 July 17, 2017 ProShares VIX Short-Term Futures ETF July 14, 2017 1-for-4 July 17, 2017 ProShares Ultra VIX Short-Term Futures ETF July 14, 2017 1-for-4 July 17, 2017

Significant Accounting Polici19

Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Cut-off Times and Times of Calculation of Funds' Final Net Asset Value for Creation and Redemption of Fund Shares	The cut-off Create/Redeem Cut-off* NAV Calculation Time NAV Calculation Date UltraShort Silver, Ultra Silver 6:30 a.m. 7:00 a.m. December 29 UltraShort Gold, Ultra Gold 9:30 a.m. 10:00 a.m. December 29 UltraShort Bloomberg Crude Oil, Ultra Bloomberg Crude Oil, 2:00 p.m. 2:30 p.m. December 29 UltraPro 3x Short Crude Oil, UltraPro 3x Crude Oil ETF UltraShort Bloomberg Natural Gas, Ultra Bloomberg Natural Gas 2:00 p.m. 2:30 p.m. December 29 UltraShort Australian Dollar 3:00 p.m. 4:00 p.m. December 29 Short Euro UltraShort Euro, Ultra Euro 3:00 p.m. 4:00 p.m. December 29 UltraShort Yen, Ultra Yen 3:00 p.m. 4:00 p.m. December 29 VIX Short-Term Futures ETF, Ultra VIX Short-Term Futures ETF, Short VIX Short-Term Futures ETF 2:00 p.m. 4:15 p.m. December 29 VIX Mid-Term 2:00 p.m. 4:15 p.m. December 29 * Although the Funds’ shares may continue to trade on secondary markets subsequent to the calculation of the final NAV, these times represent the final opportunity to transact in creation or redemption units for the year ended December 31, 2017.
Valuation of Investments using Fair Value Hierarchy	The following table summarizes the valuation of investments at December 31, 2017 using the fair value hierarchy: Level I - Quoted Prices Level II - Other Significant Observable Inputs Short-Term U.S. Futures Forward Foreign Swap Total Short Euro $ 6,996,235 $ (166,288 ) $ — $ — $ — $ 6,829,947 Short VIX Short-Term Futures ETF 494,910,644 17,041,449 — — — 511,952,093 Ultra Bloomberg Crude Oil 459,515,902 11,945,979 — — 62,238,361 533,700,242 Ultra Bloomberg Natural Gas 50,961,356 7,225,810 — — — 58,187,166 Ultra Euro 6,996,235 — — 264,152 — 7,260,387 Ultra Gold 88,884,844 5,480 3,646,355 — — 92,536,679 Ultra Silver 235,581,716 1,600 21,735,334 — — 257,318,650 Ultra VIX Short-Term Futures ETF 287,533,132 (34,466,120 ) — — — 253,067,012 Ultra Yen 1,997,933 — — (34,824 ) — 1,963,109 UltraShort Australian Dollar 11,983,904 (893,220 ) — — — 11,090,684 UltraPro 3X Crude Oil ETF — 1,417,998 — — — 1,417,998 UltraPro 3X Short Crude Oil ETF — (2,988,155 ) — — — (2,988,155 ) UltraShort Bloomberg Crude Oil 253,646,823 (3,962,648 ) — — (30,607,142 ) 219,077,033 UltraShort Bloomberg Natural Gas 3,999,751 (1,097,049 ) — — — 2,902,702 UltraShort Euro 204,770,166 — — (6,344,269 ) — 198,425,897 UltraShort Gold 31,977,900 (5,460 ) (1,488,259 ) — — 30,484,181 UltraShort Silver 18,349,861 (1,650 ) (1,716,163 ) — — 16,632,048 UltraShort Yen 131,834,352 — — 1,527,263 — 133,361,615 VIX Mid-Term 20,993,515 (2,215,280 ) — — — 18,778,235 VIX Short-Term Futures ETF 134,845,604 (4,761,877 ) — — — 130,083,727 Total Trust $ 2,445,779,873 $ (12,919,431 ) $ 22,177,267 $ (4,587,678 ) $ 31,631,219 $ 2,482,081,250 * Includes cumulative appreciation/depreciation of futures contracts as reported in the Schedules of Investments. Only current day’s variation margin is reported within the Statements of Financial Condition in receivable/payable on open futures. At December 31, 2017, there were no Level III portfolio investments for which significant unobservable inputs were used to determine fair value. The Funds’ policy is to recognize transfers between valuation levels at the end of the reporting period. At December 31, 2017, there were no significant transfers in or out of Level I and Level II fair value measurements. The inputs or methodology used for valuing investments are not necessarily an indication of the risk associated with investing in those securities. The following table summarizes the valuation of investments at December 31, 2016 using the fair value hierarchy: Level I - Quoted Prices Level II - Other Significant Observable Inputs Short-Term U.S. Futures Forward Foreign Swap Total Short Euro $ 13,164,828 $ 132,900 $ — $ — $ — $ 13,297,728 Short VIX Short-Term Futures ETF 170,396,436 (10,309,611 ) — — — 160,086,825 Ultra Bloomberg Crude Oil 885,050,007 5,537,165 — — 55,358,571 945,945,743 Ultra Bloomberg Natural Gas 36,183,648 2,536,720 — — — 38,720,368 Ultra Euro 11,891,831 — — (574,010 ) — 11,317,821 Ultra Gold 95,356,621 (18,960 ) (4,431,107 ) — — 90,906,554 Ultra Silver 295,300,799 (27,360 ) (20,976,189 ) — — 274,297,250 Ultra VIX Short-Term Futures ETF 434,671,795 (7,972,237 ) — — — 426,699,558 Ultra Yen 5,282,879 — — (342,076 ) — 4,940,803 UltraShort Australian Dollar 12,909,619 1,182,340 — — — 14,091,959 UltraShort Bloomberg Crude Oil 205,694,385 (1,426,815 ) — — (12,206,881 ) 192,060,689 UltraShort Bloomberg Natural Gas 2,899,151 (482,031 ) — — — 2,417,120 UltraShort Euro 337,375,787 — — 16,162,931 — 353,538,718 UltraShort Gold 60,540,555 18,980 3,033,566 — — 63,593,101 UltraShort Silver 21,550,319 27,310 1,384,246 — — 22,961,875 UltraShort Yen 257,102,313 — — 16,744,937 — 273,847,250 VIX Mid-Term 45,486,235 (1,288,245 ) — — — 44,197,990 VIX Short-Term Futures ETF 147,991,233 (468,652 ) — — — 147,522,581 Total Trust $ 3,038,848,441 $ (12,558,496 ) $ (20,989,484 ) $ 31,991,782 $ 43,151,690 $ 3,080,443,933 * Includes cumulative appreciation/depreciation of futures contracts as reported in the Schedules of Investments. Only current day’s variation margin is reported within the Statements of Financial Condition in receivable/payable on open futures.

Investments (Tables)

Investments (Tables)	12 Months Ended
	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Fair Value of Derivative Instruments	The following tables indicate the location of derivative related items on the Statement of Financial Condition as well as the effect of derivative instruments on the Statement of Operations during the reporting period. Fair Value of Derivative Instruments as of December 31, 2017 Assets Derivatives Liability Derivatives Derivatives not accounted for as hedging instruments Statements of Financial Fund Unrealized Statements of Financial Fund Unrealized VIX Futures Contracts Receivables on open futures contracts ProShares Short VIX Short-Term Futures ETF $ 21,493,549 * Payable on open futures contracts ProShares Short VIX Short-Term Futures ETF $ 4,452,100 * ProShares Ultra VIX Short-Term Futures ETF 3,974,642 * ProShares Ultra VIX Short-Term Futures ETF 38,440,762 * ProShares VIX Short-Term Futures ETF 709,708 * ProShares VIX Mid-Term 2,215,280 * ProShares VIX Short-Term Futures ETF 5,471,585 * Commodities Contracts Receivables on open futures contracts, unrealized appreciation on swap and/or forward agreements ProShares Ultra Bloomberg Crude Oil 74,184,340 * Payable on open futures contracts, unrealized depreciation on swap and/or forward agreements ProShares UltraPro 3x Short Crude Oil ETF 2,988,155 * ProShares Ultra Bloomberg Natural Gas 7,225,810 * ProShares UltraShort Bloomberg Crude Oil 34,569,790 * ProShares Ultra Gold 3,651,835 * ProShares UltraShort Bloomberg Natural Gas 1,097,049 * ProShares Ultra Silver 21,736,934 * ProShares UltraShort Gold 1,493,719 * ProShares UltraPro 3x Crude Oil ETF 1,417,998 * ProShares UltraShort Silver 1,717,813 * Foreign Exchange Contracts Unrealized appreciation on foreign currency forward contracts and receivables on open futures contracts ProShares Ultra Euro 321,609 Unrealized depreciation on foreign currency forward contracts and payable on open futures contracts ProShares Short Euro 166,288 * ProShares UltraShort Euro 449,302 ProShares Ultra Euro 57,457 ProShares UltraShort Yen 1,568,997 ProShares Ultra Yen 34,824 ProShares UltraShort Australian Dollar 893,220 * ProShares UltraShort Euro 6,793,571 ProShares UltraShort Yen 41,734 Total Trust $ 136,734,724 * Total Trust $ 100,433,347 * * Includes cumulative appreciation/depreciation of futures contracts as reported in the Schedules of Investments. Only current day’s variation margin is reported within the Statements of Financial Condition in receivable/payable on open futures contracts. Fair Value of Derivative Instruments as of December 31, 2016 Assets Derivatives Liability Derivatives Derivatives not accounted for as hedging instruments Statements of Financial Fund Unrealized Statements of Financial Fund Unrealized VIX Futures Contracts Receivables on open futures contracts ProShares VIX Short-Term Futures ETF $ 2,273,874 * Payable on open futures contracts ProShares VIX Short-Term Futures ETF $ 2,742,526 * ProShares VIX Mid-Term 68,375 * ProShares VIX Mid-Term 1,356,620 * ProShares Ultra VIX Short-Term Futures ETF 13,594,875 * ProShares Short VIX Short-Term Futures ETF 10,309,611 * ProShares Ultra VIX Short-Term Futures ETF 21,567,112 * Commodities Contracts Receivables on open futures contracts, unrealized appreciation on swap and/or forward agreements ProShares UltraShort Gold 3,052,546 * Payable on open futures contracts, unrealized depreciation on swap and/or forward agreements ProShares UltraShort Bloomberg Crude Oil 13,633,696 * ProShares UltraShort Silver 1,411,556 * ProShares UltraShort Bloomberg Natural Gas 482,031 * ProShares Ultra Bloomberg Crude Oil 60,895,736 * ProShares Ultra Gold 4,450,067 * ProShares Ultra Bloomberg Natural Gas 2,536,720 * ProShares Ultra Silver 21,003,549 * Foreign Exchange Contracts Unrealized appreciation on foreign currency forward contracts and receivables on open futures contracts ProShares Short Euro 132,900 * Unrealized depreciation on foreign currency forward contracts and payable on open futures contracts ProShares UltraShort Euro 356,139 ProShares UltraShort Australian Dollar 1,182,340 * ProShares UltraShort Yen 125,420 ProShares UltraShort Euro 16,519,070 ProShares Ultra Euro 576,558 ProShares UltraShort Yen 16,870,357 ProShares Ultra Yen 342,455 ProShares Ultra Euro 2,548 ProShares Ultra Yen 379 Total Trust $ 118,541,276 * Total Trust $ 76,945,784 * * Includes cumulative appreciation/depreciation of futures contracts as reported in the Schedules of Investments. Only current day’s variation margin is reported within the Statements of Financial Condition in receivable/payable on open futures contracts.
Effect of Derivative Instruments on Statements of Operations	The Effect of Derivative Instruments on the Statements of Operations For the year ended December 31, 2017 Derivatives not accounted for as hedging instruments Location of Gain (Loss) on Derivatives Recognized in Income Fund Realized Gain (Loss) on Recognized in Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in VIX Futures Contracts Net realized gain (loss) on futures contracts/ changes in unrealized appreciation/ depreciation on futures contracts ProShares Short VIX Short-Term Futures ETF $ 897,400,516 $ 27,351,060 ProShares Ultra VIX Short-Term Futures ETF (1,020,750,851 ) (26,493,883 ) ProShares VIX Mid-Term (25,319,770 ) (927,035 ) ProShares VIX Short-Term Futures ETF (194,005,568 ) (4,293,225 ) Commodity Contracts Net realized gain (loss) on futures contracts, swap and/or forward agreements/changes in unrealized appreciation/ depreciation on futures contracts, swap and/or forward agreements ProShares Ultra Bloomberg Crude Oil 22,146,212 13,288,604 ProShares Ultra Bloomberg Natural Gas (40,793,265 ) 4,689,090 ProShares Ultra Gold 11,484,410 8,101,902 ProShares Ultra Silver (31,762,834 ) 42,740,483 ProShares UltraPro 3x Crude Oil ETF 6,018,618 1,417,998 ProShares UltraPro 3x Short Crude Oil ETF (7,046,628 ) (2,988,155 ) ProShares UltraShort Bloomberg Crude Oil (6,491,060 ) (20,936,094 ) ProShares UltraShort Bloomberg Natural Gas 4,762,532 (615,018 ) ProShares UltraShort Gold (6,993,557 ) (4,546,265 ) ProShares UltraShort Silver 1,153,393 (3,129,369 ) Foreign Exchange Contracts Net realized gain (loss) on futures and/or foreign currency forward contracts/changes in unrealized appreciation/ depreciation on futures and/or foreign currency forward contracts ProShares Short Euro (1,161,987 ) (299,188 ) ProShares Ultra Euro 2,212,313 838,162 ProShares Ultra Yen (46,195 ) 307,252 ProShares UltraShort Australian Dollar (866,771 ) (2,075,560 ) ProShares UltraShort Euro (39,691,680 ) (22,507,200 ) ProShares UltraShort Yen (8,729,472 ) (15,217,674 ) Total Trust $ (438,481,644 ) $ (5,294,115 ) The Effect of Derivative Instruments on the Statements of Operations For the year ended December 31, 2016 Derivatives not accounted for as hedging instruments Location of Gain (Loss) on Fund Realized Gain (Loss) on Recognized in Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income VIX Futures Contracts Net realized gain (loss) on futures contracts/ changes in unrealized appreciation/ depreciation on futures contracts ProShares VIX Short-Term Futures ETF $ (195,475,791 ) 609,973 ProShares VIX Mid-Term (11,085,506 ) (943,885 ) ProShares Short VIX Short-Term Futures ETF 440,391,389 (21,056,026 ) ProShares Ultra VIX Short-Term Futures ETF (1,567,340,688 ) (19,866,703 ) Commodity Contracts Net realized gain (loss) on futures contracts, swap and/or forward agreements/changes in unrealized appreciation/ depreciation on futures contracts, swap and/or forward agreements ProShares UltraShort Bloomberg Crude Oil (67,752,164 ) (22,510,865 ) ProShares UltraShort Bloomberg Natural Gas 586,860 1,989,133 ProShares UltraShort Gold (12,240,751 ) 1,238,384 ProShares UltraShort Silver (17,554,714 ) (3,372,693 ) ProShares Ultra Bloomberg Crude Oil 74,061,040 151,001,639 ProShares Ultra Bloomberg Natural Gas 17,571,809 (3,776,159 ) ProShares Ultra Gold 5,816,565 (2,194,272 ) ProShares Ultra Silver 62,342,441 1,566,582 Foreign Exchange Contracts Net realized gain (loss) on futures and/or foreign currency forward contracts/changes in unrealized appreciation/ depreciation on futures and/or foreign currency forward contracts ProShares Short Euro 663,774 (110,538 ) ProShares UltraShort Australian Dollar (2,787,204 ) 1,602,610 ProShares UltraShort Euro (25,711,518 ) 44,873,267 ProShares UltraShort Yen (22,220,271 ) 30,640,389 ProShares Ultra Euro 138,959 (1,178,930 ) ProShares Ultra Yen 717,086 (603,387 ) Total Trust $ (1,319,878,684 ) 157,908,519 The Effect of Derivative Instruments on the Statements of Operations For the year ended December 31, 2015 Derivatives not accounted for as hedging instruments Location of Gain or (Loss) on Derivatives Recognized in Income Fund Realized Gain or (Loss) on Recognized in Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income VIX Futures Contracts Net realized gain (loss) on futures contracts / changes in unrealized appreciation/ depreciation on futures contracts ProShares VIX Short-Term Futures ETF $ (19,408,543 ) $ (7,343,245 ) ProShares VIX Mid-Term (3,335,936 ) (605,025 ) ProShares Short VIX Short-Term Futures ETF 69,793,028 27,098,564 ProShares Ultra VIX Short-Term Futures ETF (392,174,228 ) (27,690,787 ) Commodity Contracts Net realized gain (loss) on futures contracts, swap and/or forward agreements/changes in unrealized appreciation/ depreciation on futures contracts, swap and/or forward agreements ProShares UltraShort Bloomberg Crude Oil 91,670,324 (33,947,511 ) ProShares UltraShort Bloomberg Natural Gas 15,212,804 (6,412,629 ) ProShares UltraShort Gold 12,707,635 4,101,460 ProShares UltraShort Silver 10,759,545 4,187,736 ProShares Ultra Bloomberg Crude Oil (896,177,096 ) 32,549,981 ProShares Ultra Bloomberg Natural Gas (100,776,817 ) 41,202,162 ProShares Ultra Gold (18,605,815 ) (4,311,529 ) ProShares Ultra Silver (78,309,309 ) (10,173,451 ) Foreign Exchange Contracts Net realized gain (loss) on futures and/or foreign currency forward contracts/changes in unrealized appreciation/ depreciation on futures and/or foreign currency forward contracts ProShares Short Euro 1,559,425 (141,893 ) ProShares UltraShort Australian Dollar 4,330,463 (1,163,751 ) ProShares UltraShort Euro 131,651,572 (45,473,330 ) ProShares UltraShort Yen 8,809,464 (12,316,677 ) ProShares Ultra Euro (1,982,208 ) 708,291 ProShares Ultra Yen (472,913 ) 276,556 Total Trust* $ (1,164,748,605 ) $ (39,455,078 ) * Amounts exclude the activity of: ProShares Managed Futures Strategy which liquidated on March 30, 2016, ProShares UltraShort Bloomberg Commodity and ProShares Ultra Bloomberg Commodity which liquidated on September 1, 2016.
Offsetting of Financial Assets and Liabilities	The following table presents each Fund’s derivatives by investment type and by counterparty net of amounts available for offset under a master netting agreement and the related collateral received or pledged by the Funds as of December 31, 2017: Fair Values of Derivative Instruments as of December 31, 2017 Assets Liabilities Gross Gross Net Amounts Gross Gross Net Amounts ProShares Ultra Bloomberg Crude Oil Swap agreements $ 62,238,361 $ — $ 62,238,361 $ — $ — $ — ProShares Ultra Euro Foreign currency forward contracts 321,609 — 321,609 57,457 — 57,457 ProShares Ultra Gold Forward agreements 3,646,355 — 3,646,355 — — — ProShares Ultra Silver Forward agreements 21,735,334 — 21,735,334 — — — ProShares UltraShort Bloomberg Crude Oil Swap agreements — — — 30,607,142 — 30,607,142 ProShares UltraShort Euro Foreign currency forward contracts 449,302 — 449,302 6,793,571 — 6,793,571 ProShares UltraShort Gold Forward agreements — — — 1,488,259 — 1,488,259 ProShares UltraShort Silver Forward agreements — — — 1,716,163 — 1,716,163 ProShares UltraShort Yen Foreign currency forward contracts 1,568,997 — 1,568,997 41,734 — 41,734 ProShares Ultra Yen Foreign currency forward contracts — — — 34,824 — 34,824 The following table presents each Fund’s derivatives by investment type and by counterparty net of amounts available for offset under a master netting agreement and the related collateral received or pledged by the Funds as of December 31, 2016: Fair Values of Derivative Instruments as of December 31, 2016 Assets Liabilities Gross Gross Net Amounts Gross Gross Net Amounts ProShares Ultra Bloomberg Crude Oil Swap agreements $ 55,358,571 $ — $ 55,358,571 $ — $ — $ — ProShares Ultra Euro Foreign currency forward contracts 2,548 — 2,548 576,558 — 576,558 ProShares Ultra Gold Forward agreements — — — 4,431,107 — 4,431,107 ProShares Ultra Silver Forward agreements — — — 20,976,189 — 20,976,189 ProShares UltraShort Bloomberg Crude Oil Swap agreements — — — 12,206,881 — 12,206,881 ProShares UltraShort Euro Foreign currency forward contracts 16,519,070 — 16,519,070 356,139 — 356,139 ProShares UltraShort Gold Forward agreements 3,033,566 — 3,033,566 — — — ProShares UltraShort Silver Forward agreements 1,384,246 — 1,384,246 — — — ProShares UltraShort Yen Foreign currency forward contracts 16,870,357 — 16,870,357 125,420 — 125,420 ProShares Ultra Yen Foreign currency forward contracts 379 — 379 342,455 — 342,455
Gross Amounts Not Offset in Statements of Financial Condition	Asset (Liability) amounts shown in the table below represent amounts owed to (by) the Funds for the derivative-related investments at December 31, 2017. These amounts may be collateralized by cash or financial instruments, segregated for the benefit of the Funds or the counterparties, depending on whether the related contracts are in an appreciated or depreciated position at period end. Amounts shown in the column labeled “Net Amount” represent the uncollateralized portions of these amounts at period end. These amounts may be un-collateralized Gross Amounts Not Offset in the Statements of Financial Condition as of December 31, 2017 Amounts of Recognized Assets / (Liabilities) presented in the Statements of Financial Condition Financial Instruments for the Benefit of (the Funds) /the Counterparties Cash Collateral for the Benefit of (the Funds) / the Counterparties Net Amount ProShares Ultra Bloomberg Crude Oil Citibank N.A. $ 19,815,892 $ — $ — $ 19,815,892 Goldman Sachs International 16,654,031 (14,861,090 ) — 1,792,941 Societe Generale S.A. 9,003,519 (8,525,505 ) — 478,014 UBS AG 16,764,919 (15,477,566 ) — 1,287,353 ProShares Ultra Euro Goldman Sachs International 102,424 — — 102,424 UBS AG 161,728 — — 161,728 ProShares Ultra Gold Citibank N.A. 1,513,310 — — 1,513,310 Goldman Sachs International 969,501 (967,678 ) (1,823 ) — Societe Generale S.A. 218,319 — — 218,319 UBS AG 945,225 (945,225 ) — — ProShares Ultra Silver Citibank N.A. 7,201,744 — — 7,201,744 Goldman Sachs International 5,873,080 (4,903,696 ) — 969,384 Societe Generale S.A. 2,761,817 (2,516,153 ) — 245,664 UBS AG 5,898,693 (4,930,596 ) — 968,097 ProShares UltraShort Bloomberg Crude Oil Citibank N.A. (10,173,164 ) 10,173,164 — — Goldman Sachs International (9,242,398 ) 9,242,398 — — Societe Generale S.A. (1,904,113 ) 1,904,113 — — UBS AG (9,287,467 ) 9,287,467 — — ProShares UltraShort Euro Goldman Sachs International (3,297,612 ) 259,612 3,038,000 — UBS AG (3,046,657 ) 3,046,657 — — ProShares UltraShort Gold Citibank N.A. (554,559 ) 554,559 — — Goldman Sachs International (428,358 ) 428,358 — — Societe Generale S.A. (126,928 ) 126,928 — — UBS AG (378,414 ) 378,414 — — ProShares UltraShort Silver Citibank N.A. (632,593 ) 632,593 — — Goldman Sachs International (486,240 ) — 486,240 — Societe Generale S.A. (115,305 ) 115,305 — — UBS AG (482,025 ) 482,025 — — ProShares UltraShort Yen Goldman Sachs International 821,317 (810,030 ) — 11,287 UBS AG 705,946 — (705,946 ) — ProShares Ultra Yen Goldman Sachs International (17,410 ) 17,410 — — UBS AG (17,414 ) 17,414 — — Asset (Liability) amounts shown in the table below represent amounts owed to (by) the Funds for the derivative-related investments at December 31, 2016. These amounts may be collateralized by cash or financial instruments, segregated for the benefit of the Funds or the counterparties, depending on whether the related contracts are in an appreciated or depreciated position at period end. Amounts shown in the column labeled “Net Amount” represent the uncollateralized portions of these amounts at period end. These amounts may be un-collateralized Gross Amounts Not Offset in the Statements of Financial Condition as of December 31, 2016 Amounts of Recognized Assets / (Liabilities) presented in the Statements of Financial Condition Financial Instruments for the Benefit of (the Funds) / the Counterparties Cash Collateral for the Benefit of (the Funds) / the Counterparties Net Amount ProShares Ultra Bloomberg Crude Oil Citibank N.A. $ 18,427,009 $ — $ — $ 18,427,009 Goldman Sachs International 14,016,906 (14,016,906 ) — — Societe Generale S.A. 8,661,821 (8,661,821 ) — — UBS AG 14,252,835 — (14,252,835 ) — ProShares Ultra Euro Goldman Sachs International (239,256 ) 239,256 — — UBS AG (334,754 ) 334,754 — — ProShares Ultra Gold Citibank N.A. (1,464,982 ) 1,464,982 — — Goldman Sachs International (1,112,916 ) 1,112,916 — — Societe Generale S.A. (643,587 ) 643,587 — — UBS AG (1,209,622 ) 1,209,622 — — ProShares Ultra Silver Citibank N.A. (6,946,009 ) 6,946,009 — — Goldman Sachs International (5,869,092 ) 5,869,092 — — Societe Generale S.A. (2,532,729 ) 2,532,729 — — UBS AG (5,628,359 ) 5,628,359 — — ProShares UltraShort Bloomberg Crude Oil Citibank N.A. (4,742,191 ) 4,742,191 — — Goldman Sachs International (3,061,395 ) 3,061,395 — — Societe Generale S.A. (1,050,699 ) 1,050,699 — — UBS AG (3,352,596 ) 3,352,596 — — ProShares UltraShort Euro Goldman Sachs International 8,109,067 (8,109,067 ) — — UBS AG 8,053,864 — (8,053,864 ) — ProShares UltraShort Gold Citibank N.A. 1,147,811 — — 1,147,811 Goldman Sachs International 881,454 (874,948 ) — 6,506 Societe Generale S.A. 393,006 (393,006 ) — — UBS AG 611,295 — (611,295 ) — ProShares UltraShort Silver Citibank N.A. 610,478 — — 610,478 Goldman Sachs International 323,829 (323,829 ) — — Societe Generale S.A. 86,543 (86,543 ) — — UBS AG 363,396 — (363,396 ) — ProShares UltraShort Yen Goldman Sachs International 8,256,779 (7,771,819 ) — 484,960 UBS AG 8,488,158 — (7,980,000 ) 508,158 ProShares Ultra Yen Goldman Sachs International (219,736 ) 219,736 — — UBS AG (122,340 ) 122,340 — —

Creation and Redemption of Cr21

Creation and Redemption of Creation Units (Tables)	12 Months Ended
	Dec. 31, 2017
Text Block [Abstract]
Schedule of Transaction Fees	Transaction fees for the years ended December 31, 2017, 2016 and 2015 which are included in the Addition and/or Redemption of Shares on the Statements of Changes in Shareholders’ Equity, were as follows: Fund Year Ended Year Ended Year Ended Short Euro $ — $ — $ — Short VIX Short-Term Futures ETF 1,008,452 801,564 342, 734 Ultra Bloomberg Crude Oil 610,969 504,533 847,422 Ultra Bloomberg Natural Gas 15,937 9,175 13,939 Ultra Euro — — — Ultra Gold 14,460 14,138 4,218 Ultra Silver 28,622 47,414 38,848 Ultra VIX Short-Term Futures ETF 1,036,162 1,822,247 1,391,292 Ultra Yen — — — UltraPro 3X Crude Oil ETF 25,455 — — UltraPro 3X Short Crude Oil ETF 14,096 — — UltraShort Australian Dollar — — — UltraShort Bloomberg Crude Oil 207,707 398,027 382,054 UltraShort Bloomberg Natural Gas 4,713 8,989 8,853 UltraShort Euro — — — UltraShort Gold 15,945 29,854 11,024 UltraShort Silver — 16,729 39,354 UltraShort Yen — — — VIX Mid-Term 13,605 24,056 8,521 VIX Short-Term Futures ETF 142,380 229,699 105,024 Total Trust* $ 3,138,503 $ 3,906,425 $ 3,193,283 * Amounts exclude the activity of ProShares Ultra Australian Dollar which liquidated on June 29, 2015, ProShares Managed Futures Strategy which liquidated on March 30, 2016, ProShares UltraShort Bloomberg Commodity and ProShares Ultra Bloomberg Commodity which liquidated on September 1, 2016.

Financial Highlights (Tables)

Financial Highlights (Tables)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Per Share Operating Performance	Selected data for a Share outstanding throughout the year ended December 31, 2017: For the Year Ended December 31, 2017 Per Share Operating Performance Short Euro Short VIX Short-Term Ultra Bloomberg Ultra Bloomberg Ultra Euro Ultra Gold Net asset value, at December 31, 2016 $ 45.06 $ 45.62 $ 23.34 $ 18.85 $ 14.02 $ 32.90 Net investment income (loss) (0.14 ) (0.60 ) (0.03 ) (0.05 ) (0.04 ) (0.06 ) Net realized and unrealized gain (loss)# (4.96 ) 82.28 0.35 (12.27 ) 3.46 7.04 Change in net asset value from operations (5.10 ) 81.68 0.32 (12.32 ) 3.42 6.98 Net asset value, at December 31, 2017 $ 39.96 $ 127.30 $ 23.66 $ 6.53 $ 17.44 $ 39.88 Market value per share, at December 31, 2016† $ 45.12 $ 45.49 $ 23.36 $ 18.96 $ 14.09 $ 33.20 Market value per share, at December 31, 2017† $ 39.99 $ 128.21 $ 23.44 $ 6.50 $ 17.46 $ 40.67 Total Return, at net asset value (11.3 )% 179.0 % 1.4 % (65.4 )% 24.4 % 21.2 % Total Return, at market value (11.4 )% 181.8 % 0.3 % (65.7 )% 23.9 % 22.5 % Ratios to Average Net Assets Expense ratio 0.97 % 1.51 % 0.98 % 1.22 % 0.95 % 0.95 % Expense ratio, excluding brokerage commissions and fees 0.95 % 0.95 % 0.95 % 0.95 % 0.95 % 0.95 % Net investment income (loss) (0.32 )% (0.71 )% (0.18 )% (0.50 )% (0.23 )% (0.14 )% * See Note 1 of these Notes to Financial Statements. # The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period. † Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds’ net asset value is calculated. For the Year Ended December 31, 2017 Per Share Operating Performance Ultra Silver Ultra VIX Short-Term Ultra Yen UltraPro 3X Crude UltraPro 3X Short UltraShort Net asset value, at December 31, 2016 $ 33.44 $ 173.93 $ 55.43 $ 25.00 $ 25.00 $ 55.38 Net investment income (loss) (0.05 ) (0.33 ) (0.24 ) (0.21 ) (0.17 ) (0.17 ) Net realized and unrealized gain (loss)# 0.16 (163.27 ) 2.13 12.99 (14.25 ) (9.54 ) Change in net asset value from operations 0.11 (163.60 ) 1.89 12.78 (14.42 ) (9.71 ) Net asset value, at December 31, 2017 $ 33.55 $ 10.33 $ 57.32 $ 37.78 $ 10.58 $ 45.67 Market value per share, at December 31, 2016† $ 32.09 $ 175.00 $ 55.52 $ 25.00 $ 25.00 $ 55.24 Market value per share, at December 31, 2017† $ 33.85 $ 10.21 $ 57.45 $ 37.23 $ 10.72 $ 45.72 Total Return, at net asset value 0.3 % (94.1 )% 3.4 % 51.1 %^ (57.7 )%^ (17.5 )% Total Return, at market value 5.5 % (94.2 )% 3.5 % 48.9 %^ (57.1 )%^ (17.2 )% Ratios to Average Net Assets Expense ratio 0.95 % 1.90 % 0.95 % 1.30 %** 1.32 %** 1.02 % Expense ratio, excluding brokerage commissions and fees 0.95 % 0.95 % 0.95 % 0.95 %** 0.95 %** 0.95 % Net investment income (loss) (0.15 )% (1.17 )% (0.41 )% (1.20 )%** (1.25 )%** (0.36 )% * See Note 1 of these Notes to Financial Statements. + From commencement of operations, March 24, 2017 through December 31, 2017. # The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period. † Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds’ net asset value is calculated. For ProShares UltraPro 3x Crude Oil ETF and ProShares UltraPro 3x Short Crude Oil ETF, the returns of shares outstanding for the period from commencement of operations through December 31, 2017 are calculated based on the initial offering price upon commencement of operations of $25.00. ^ Percentages are not annualized for the period ended December 31, 2017. ** Percentages are annualized. For the Year Ended December 31, 2017 Per Share Operating Performance UltraShort UltraShort UltraShort Euro UltraShort Gold UltraShort UltraShort Yen Net asset value, at December 31, 2016 $ 31.70 $ 23.10 $ 27.08 $ 91.33 $ 37.31 $ 80.24 Net investment income (loss) (0.06 ) (0.27 ) (0.04 ) (0.13 ) (0.06 ) (0.14 ) Net realized and unrealized gain (loss)# (7.33 ) 16.65 (5.83 ) (20.73 ) (5.54 ) (5.17 ) Change in net asset value from operations (7.39 ) 16.38 (5.87 ) (20.86 ) (5.60 ) (5.31 ) Net asset value, at December 31, 2017 $ 24.31 $ 39.48 $ 21.21 $ 70.47 $ 31.71 $ 74.93 Market value per share, at December 31, 2016† $ 31.65 $ 23.05 $ 27.08 $ 90.54 $ 38.76 $ 80.25 Market value per share, at December 31, 2017† $ 24.56 $ 39.65 $ 21.20 $ 69.11 $ 31.40 $ 74.98 Total Return, at net asset value (23.3 )% 70.9 % (21.7 )% (22.8 )% (15.0 )% (6.6 )% Total Return, at market value (22.4 )% 72.0 % (21.7 )% (23.7 )% (19.0 )% (6.6 )% Ratios to Average Net Assets Expense ratio 0.99 % 1.39 % 0.95 % 0.95 % 0.95 % 0.95 % Expense ratio, excluding brokerage commissions and fees 0.95 % 0.95 % 0.95 % 0.95 % 0.95 % 0.95 % Net investment income (loss) (0.17 )% (0.81 )% (0.15 )% (0.17 )% (0.18 )% (0.19 )% # The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period. † Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds’ net asset value is calculated. For the Year Ended December 31, 2017 Per Share Operating Performance VIX Mid-Term VIX Short-Term Net asset value, at December 31, 2016 $ 42.14 $ 84.86 Net investment income (loss) (0.06 ) (0.07 ) Net realized and unrealized gain (loss)# (20.79 ) (61.45 ) Change in net asset value from operations (20.85 ) (61.52 ) Net asset value, at December 31, 2017 $ 21.29 $ 23.34 Market value per share, at December 31, 2016† $ 42.34 $ 85.04 Market value per share, at December 31, 2017† $ 21.15 $ 23.15 Total Return, at net asset value (49.5 )% (72.5 )% Total Return, at market value (50.0 )% (72.8 )% Ratios to Average Net Assets Expense ratio 0.91 % 0.96 % Expense ratio, excluding brokerage commissions and fees 0.85 % 0.85 % Net investment income (loss) (0.22 )% (0.18 )% * See Note 1 of these Notes to Financial Statements. # The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period. † Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds’ net asset value is calculated. Selected data for a Share outstanding throughout the year ended December 31, 2016: For the Year Ended December 31, 2016 Per Share Operating Performance Short Euro Short VIX Short-Term Ultra Bloomberg Ultra Bloomberg Ultra Euro Ultra Gold Net asset value, at December 31, 2015 $ 43.78 $ 25.41 $ 25.15 $ 18.57 $ 15.51 $ 29.73 Net investment income (loss) (0.33 ) (0.30 ) (0.15 ) (0.16 ) (0.11 ) (0.28 ) Net realized and unrealized gain (loss)# 1.61 20.51 (1.66 ) 0.44 (1.38 ) 3.45 Change in net asset value from operations 1.28 20.21 (1.81 ) 0.28 (1.49 ) 3.17 Net asset value, at December 31, 2016 $ 45.06 $ 45.62 $ 23.34 $ 18.85 $ 14.02 $ 32.90 Market value per share, at December 31, 2015† $ 43.74 $ 25.23 $ 25.08 $ 18.48 $ 15.51 $ 29.73 Market value per share, at December 31, 2016† $ 45.12 $ 45.49 $ 23.36 $ 18.96 $ 14.09 $ 33.20 Total Return, at net asset value 2.9 % 79.5 % (7.2 )% 1.5 % (9.6 )% 10.7 % Total Return, at market value 3.2 % 80.3 % (6.9 )% 2.6 % (9.2 )% 11.7 % Ratios to Average Net Assets Expense ratio 0.97 % 1.39 % 1.01 % 1.34 % 0.95 % 0.95 % Expense ratio, excluding brokerage commissions 0.95 % 0.95 % 0.95 % 0.95 % 0.95 % 0.95 % Net investment income (loss) (0.76 )% (1.15 )% (0.76 )% (1.12 )% (0.71 )% (0.69 )% * See Note 1 of these Notes to Financial Statements. # The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period. † Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds’ net asset value is calculated. For the Year Ended December 31, 2016 Per Share Operating Performance Ultra Silver Ultra VIX Ultra Yen UltraShort UltraShort UltraShort Net asset value, at December 31, 2015 $ 27.06 $ 2,808.40 $ 54.75 $ 58.46 $ 66.60 $ 46.53 Net investment income (loss) (0.27 ) (7.68 ) (0.45 ) (0.43 ) (0.36 ) (0.68 ) Net realized and unrealized gain (loss)# 6.65 (2,626.79 ) 1.13 (2.65 ) (34.54 ) (22.75 ) Change in net asset value from operations 6.38 (2,634.47 ) 0.68 (3.08 ) (34.90 ) (23.43 ) Net asset value, at December 31, 2016 $ 33.44 $ 173.93 $ 55.43 $ 55.38 $ 31.70 $ 23.10 Market value per share, at December 31, 2015† $ 27.08 $ 2,835.00 $ 54.70 $ 58.15 $ 66.82 $ 46.55 Market value per share, at December 31, 2016† $ 32.09 $ 175.00 $ 55.52 $ 55.24 $ 31.65 $ 23.05 Total Return, at net asset value 23.6 % (93.8 )% 1.2 % (5.3 )% (52.4 )% (50.4 )% Total Return, at market value 18.5 % (93.8 )% 1.5 % (5.0 )% (52.6 )% (50.5 )% Ratios to Average Net Assets Expense ratio 0.95 % 1.57 % 0.95 % 1.03 % 1.03 % 1.65 % Expense ratio, excluding brokerage commissions 0.95 % 0.85 % 0.95 % 0.95 % 0.95 % 0.95 % Net investment income (loss) (0.69 )% (1.32 )% (0.69 )% (0.79 )% (0.76 )% (1.43 )% * See Note 1 of these Notes to Financial Statements. # The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period. † Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds’ net asset value is calculated. For the Year Ended December 31, 2016 Per Share Operating Performance UltraShort Euro UltraShort Gold UltraShort UltraShort Yen VIX Mid-Term VIX Short-Term Net asset value, at December 31, 2015 $ 25.54 $ 115.88 $ 64.58 $ 87.94 $ 53.96 $ 264.84 Net investment income (loss) (0.17 ) (0.55 ) (0.26 ) (0.50 ) (0.33 ) (1.10 ) Net realized and unrealized gain (loss)# 1.71 (24.00 ) (27.01 ) (7.20 ) (11.49 ) (178.88 ) Change in net asset value from operations 1.54 (24.55 ) (27.27 ) (7.70 ) (11.82 ) (179.98 ) Net asset value, at December 31, 2016 $ 27.08 $ 91.33 $ 37.31 $ 80.24 $ 42.14 $ 84.86 Market value per share, at December 31, 2015† $ 25.53 $ 115.83 $ 64.55 $ 87.89 $ 53.99 $ 266.60 Market value per share, at December 31, 2016† $ 27.08 $ 90.54 $ 38.76 $ 80.25 $ 42.34 $ 85.04 Total Return, at net asset value 6.0 % (21.2 )% (42.2 )% (8.8 )% (21.9 )% (68.0 )% Total Return, at market value 6.1 % (21.8 )% (40.0 )% (8.7 )% (21.6 )% (68.1 )% Ratios to Average Net Assets Expense ratio 0.95 % 0.95 % 0.95 % 0.95 % 0.93 % 0.99 % Expense ratio, excluding brokerage commissions 0.95 % 0.95 % 0.95 % 0.95 % 0.85 % 0.85 % Net investment income (loss) (0.70 )% (0.70 )% (0.70 )% (0.71 )% (0.68 )% (0.75 )% * See Note 1 of these Notes to Financial Statements. # The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period. † Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds’ net asset value is calculated. Selected data for a Share outstanding throughout the year ended December 31, 2015 For the Year Ended December 31, 2015 Per Share Operating Performance Short Euro Short VIX Short-Term Ultra Bloomberg Ultra Bloomberg Ultra Euro Ultra Gold Net asset value, at December 31, 2014 $ 40.06 $ 30.70 $ 101.48 $ 61.65 $ 19.87 $ 40.00 Net investment income (loss) (0.40 ) (0.41 ) (0.56 ) (0.50 ) (0.15 ) (0.33 ) Net realized and unrealized gain (loss)# 4.12 (4.88 ) (75.77 ) (42.58 ) (4.21 ) (9.94 ) Change in net asset value from operations 3.72 (5.29 ) (76.33 ) (43.08 ) (4.36 ) (10.27 ) Net asset value, at December 31, 2015 $ 43.78 $ 25.41 $ 25.15 $ 18.57 $ 15.51 $ 29.73 Market value per share, at December 31, 2014† $ 40.03 $ 30.58 $ 103.70 $ 63.12 $ 19.80 $ 38.41 Market value per share, at December 31, 2015† $ 43.74 $ 25.23 $ 25.08 $ 18.48 $ 15.51 $ 29.73 Total Return, at net asset value 9.3 % (17.2 )% (75.2 )% (69.9 )% (22.0 )% (25.7 )% Total Return, at market value 9.3 % (17.5 )% (75.8 )% (70.7 )% (21.7 )% (22.6 )% Ratios to Average Net Assets Expense ratio 0.97 % 1.40 % 1.02 % 1.29 % 0.95 % 0.95 % Expense ratio, excluding brokerage commissions 0.95 % 0.95 % 0.95 % 0.95 % 0.95 % 0.95 % Net investment income (loss) (0.95 )% (1.36 )% (0.98 )% (1.26 )% (0.93 )% (0.90 )% * See Note 1 of these Notes to Financial Statements. # The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period. † Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds’ net asset value is calculated. For the Year Ended December 31, 2015 Per Share Operating Performance Ultra Silver Ultra VIX Ultra Yen* UltraShort UltraShort UltraShort Net asset value, at December 31, 2014 $ 39.37 $ 12,546.00 $ 56.47 $ 51.38 $ 38.99 $ 27.99 Net investment income (loss) (0.33 ) (72.24 ) (0.48 ) (0.57 ) (0.39 ) (0.44 ) Net realized and unrealized gain (loss)# (11.98 ) (9,665.36 ) (1.24 ) 7.65 28.00 18.98 Change in net asset value from operations (12.31 ) (9,737.60 ) (1.72 ) 7.08 27.61 18.54 Net asset value, at December 31, 2015 $ 27.06 $ 2,808.40 $ 54.75 $ 58.46 $ 66.60 $ 46.53 Market value per share, at December 31, 2014† $ 38.05 $ 12,575.00 $ 56.48 $ 51.37 $ 38.26 $ 27.34 Market value per share, at December 31, 2015† $ 27.07 $ 2,835.00 $ 54.70 $ 58.15 $ 66.82 $ 46.53 Total Return, at net asset value (31.3 )% (77.6 )% (3.0 )% 13.8 % 70.8 % 66.3 % Total Return, at market value (28.8 )% (77.5 )% (3.2 )% 13.2 % 74.6 % 70.3 % Ratios to Average Net Assets Expense ratio 0.95 % 1.65 % 0.95 % 1.03 % 1.07 % 1.55 % Expense ratio, excluding brokerage commissions 0.95 % 0.95 % 0.95 % 0.95 % 0.95 % 0.95 % Net investment income (loss) (0.89 )% (1.61 )% (0.88 )% (1.00 )% (1.04 )% (1.50 )% * See Note 1 of these Notes to Financial Statements. # Percentages The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period. † Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds’ net asset value is calculated. For the Year Ended December 31, 2015 Per Share Operating Performance UltraShort Euro UltraShort Gold UltraShort UltraShort Yen VIX Mid-Term VIX Short-Term Net asset value, at December 31, 2014 $ 21.59 $ 96.65 $ 57.81 $ 89.33 $ 63.60 $ 418.64 Net investment income (loss) (0.22 ) (0.91 ) (0.50 ) (0.82 ) (0.51 ) (2.65 ) Net realized and unrealized gain (loss)# 4.17 20.14 7.27 (0.57 ) (9.13 ) (151.15 ) Change in net asset value from operations 3.95 19.23 6.77 (1.39 ) (9.64 ) (153.80 ) Net asset value, at December 31, 2015 $ 25.54 $ 115.88 $ 64.58 $ 87.94 $ 53.96 $ 264.84 Market value per share, at December 31, 2014† $ 21.61 $ 100.22 $ 59.70 $ 89.30 $ 63.89 $ 419.80 Market value per share, at December 31, 2015† $ 25.53 $ 115.83 $ 64.55 $ 87.89 $ 53.99 $ 266.60 Total Return, at net asset value 18.3 % 19.9 % 11.7 % (1.6 )% (15.2 )% (36.7 )% Total Return, at market value 18.1 % 15.6 % 8.1 % (1.6 )% (15.5 )% (36.5 )% Ratios to Average Net Assets Expense ratio 0.95 % 0.95 % 0.95 % 0.95 % 0.91 % 0.95 % Expense ratio, excluding brokerage commissions 0.95 % 0.95 % 0.95 % 0.95 % 0.85 % 0.85 % Net investment income (loss) (0.90 )% (0.91 )% (0.91 )% (0.92 )% (0.88 )% (0.92 )% * See Note 1 of these Notes to Financial Statements. # The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period. † Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds’ net asset value is calculated.

Schedule of Investments - Short

Schedule of Investments - Short-Term U.S. Government and Agency Obligations (Detail) - USD ($)		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		$ 2,445,779,873		$ 3,038,848,441
ProShares Short Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		88.00%		83.00%
Short-term U.S. government and agency obligations percentage of shareholders' equity		$ 6,996,235		$ 13,164,828
ProShares Short Euro [Member] | U.S. Treasury Bills 1.033% due 01/18/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	$ 7,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.033%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	$ 6,996,235
ProShares Short Euro [Member] | U.S. Treasury Bills 0.270% due 01/12/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 8,168,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.27%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 8,167,194
ProShares Short Euro [Member] | U.S. Treasury Bills 0.355% due 01/19/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 2,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.355%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 1,999,631
ProShares Short Euro [Member] | U.S. Treasury Bills 0.491% due 02/23/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 3,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.491%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 2,998,003
ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		64.00%		75.00%
Short-term U.S. government and agency obligations percentage of shareholders' equity		$ 494,910,644		$ 170,396,436
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.209% due 02/08/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[2]	$ 36,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	1.209%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	$ 35,954,122
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.080% due 02/15/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	$ 70,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.08%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	$ 69,893,908
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.145% due 02/22/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[2]	$ 87,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	1.145%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	$ 86,846,558
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.155% due 03/01/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	$ 60,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.155%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	$ 59,876,748
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.256% due 03/08/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	$ 70,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.256%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	$ 69,835,696
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.271% due 03/15/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	$ 63,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.271%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	$ 62,837,460
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.277% due 03/22/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	$ 75,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.277%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	$ 74,780,280
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.267% due 03/29/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	$ 35,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.267%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	$ 34,885,872
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.471% due 02/09/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 47,500,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.471%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 47,478,520
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.437% due 02/16/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[2]			$ 95,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]			0.437%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]			$ 94,948,330
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.493% due 03/23/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 28,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.493%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 27,969,586
ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		88.00%		95.00%
Short-term U.S. government and agency obligations percentage of shareholders' equity		$ 459,515,902		$ 885,050,007
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.033% due 01/18/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[3]	$ 38,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	1.033%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	$ 37,979,564
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.270% due 01/12/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[4]			$ 113,636,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]			0.27%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]			$ 113,624,784
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.491% due 02/23/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[4]			$ 20,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]			0.491%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]			$ 19,986,684
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.080% due 02/15/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[3]	$ 50,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	1.08%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	$ 49,924,220
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.145% due 02/22/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[3]	$ 18,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	1.145%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	$ 17,968,253
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.493% due 03/23/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[4]			$ 12,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]			0.493%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]			$ 11,986,966
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.001% due 01/04/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[3]	$ 63,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	1.001%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	$ 62,996,081
ProShares Ultra Bloomberg Crude Oil [Member] | United States Treasury Bills 1.022% due 01/11/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[3]	$ 63,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	1.022%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	$ 62,982,203
ProShares Ultra Bloomberg Crude Oil [Member] | United States Treasury Bills 1.082% due 01/25/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[3]	$ 47,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	1.082%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	$ 46,962,616
ProShares Ultra Bloomberg Crude Oil [Member] | United States Treasury Bills 1.146% due 02/01/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[3]	$ 41,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	1.146%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	$ 40,957,635
ProShares Ultra Bloomberg Crude Oil [Member] | United States Treasury Bills 1.118% due 02/08/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[3]	$ 61,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	1.118%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	$ 60,922,262
ProShares Ultra Bloomberg Crude Oil [Member] | United States Treasury Bills1.223% due 03/01/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[3]	$ 29,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	1.223%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	$ 28,940,428
ProShares Ultra Bloomberg Crude Oil [Member] | United States Treasury Bills 1.256% due 03/08/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[3]	$ 50,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	1.256%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	$ 49,882,640
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.289% due 01/05/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[4]			$ 144,500,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]			0.289%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]			$ 144,496,908
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.371% due 01/19/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[4]			$ 48,500,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]			0.371%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]			$ 48,491,057
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.362% due 01/26/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[4]			$ 106,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]			0.362%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]			$ 105,971,899
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.418% due 02/02/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[4]			$ 105,749,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]			0.418%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]			$ 105,712,432
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.400% due 02/09/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[4]			$ 108,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]			0.40%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]			$ 107,951,162
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.420% due 02/16/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[4]			$ 77,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]			0.42%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]			$ 76,958,120
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.481% due 03/09/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[4]			$ 150,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]			0.481%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]			$ 149,869,995
ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		81.00%		84.00%
Short-term U.S. government and agency obligations percentage of shareholders' equity		$ 50,961,356		$ 36,183,648
ProShares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.491% due 02/23/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 2,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.491%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 1,998,668
ProShares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 1.271% due 03/15/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	$ 3,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.271%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	$ 2,992,260
ProShares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.493% due 03/23/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 3,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.493%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 2,996,741
ProShares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 1.000% due 01/04/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	$ 16,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.00%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	$ 15,999,005
ProShares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 1.001% due 01/11/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	$ 9,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.001%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	$ 8,997,457
ProShares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 1.033% due 01/18/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	$ 6,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.033%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	$ 5,996,773
ProShares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 1.040% due 02/01/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	$ 8,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.04%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	$ 7,991,734
ProShares Ultra Bloomberg Natural Gas [Member] | United States Treasury Bills 1.145% due 02/22/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	$ 9,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.145%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	$ 8,984,127
ProShares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.435% due 01/12/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 1,200,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.435%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 1,199,882
ProShares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.345% due 01/19/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 8,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.345%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 7,998,525
ProShares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.311% due 01/26/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 3,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.311%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 2,999,205
ProShares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.403% due 02/02/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 3,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.403%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 2,998,963
ProShares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.425% due 02/09/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 4,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.425%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 3,998,191
ProShares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.440% due 02/16/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 12,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.44%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 11,993,473
ProShares Ultra Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		73.00%		100.00%
Short-term U.S. government and agency obligations percentage of shareholders' equity		$ 6,996,235		$ 11,891,831
ProShares Ultra Euro [Member] | U.S. Treasury Bills 1.033% due 01/18/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	$ 7,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]	1.033%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	$ 6,996,235
ProShares Ultra Euro [Member] | U.S. Treasury Bills 0.270% due 01/12/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 901,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.27%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 900,911
ProShares Ultra Euro [Member] | U.S. Treasury Bills 0.493% due 03/23/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 8,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.493%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 7,991,310
ProShares Ultra Euro [Member] | U.S. Treasury Bills 0.295% due 01/05/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[5]			$ 1,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]			0.295%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]			$ 999,979
ProShares Ultra Euro [Member] | U.S. Treasury Bills 0.299% due 01/19/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[5]			$ 2,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]			0.299%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]			$ 1,999,631
ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		95.00%		104.00%
Short-term U.S. government and agency obligations percentage of shareholders' equity		$ 88,884,844		$ 95,356,621
ProShares Ultra Gold [Member] | U.S. Treasury Bills 0.355% due 01/19/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[6]			$ 4,395,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			0.355%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			$ 4,394,189
ProShares Ultra Gold [Member] | U.S. Treasury Bills 0.491% due 02/23/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[6]			$ 4,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			0.491%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			$ 3,997,337
ProShares Ultra Gold [Member] | U.S. Treasury Bills 1.080% due 02/15/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[7]	$ 15,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.08%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	$ 14,977,266
ProShares Ultra Gold [Member] | U.S. Treasury Bills 1.267% due 03/29/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[7]	$ 8,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.267%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	$ 7,973,914
ProShares Ultra Gold [Member] | U.S. Treasury Bills 1.000% due 01/04/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	$ 16,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.00%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	$ 15,999,005
ProShares Ultra Gold [Member] | U.S. Treasury Bills 1.001% due 01/11/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[7]	$ 12,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.001%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	$ 11,996,610
ProShares Ultra Gold [Member] | U.S. Treasury Bills 1.033% due 01/18/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[7]	$ 10,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.033%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	$ 9,994,622
ProShares Ultra Gold [Member] | U.S. Treasury Bills 1.075% due 02/08/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[7]	$ 12,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.075%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	$ 11,984,707
ProShares Ultra Gold [Member] | U.S. Treasury Bills 1.298% due 03/15/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[7]	$ 16,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.298%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	$ 15,958,720
ProShares Ultra Gold [Member] | U.S. Treasury Bills 0.318% due 01/05/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[6]			$ 5,340,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			0.318%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			$ 5,339,886
ProShares Ultra Gold [Member] | U.S. Treasury Bills 0.276% due 01/12/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[6]			$ 15,564,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			0.276%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			$ 15,562,464
ProShares Ultra Gold [Member] | U.S. Treasury Bills 0.360% due 01/26/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[6]			$ 22,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			0.36%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			$ 21,994,168
ProShares Ultra Gold [Member] | U.S. Treasury Bills 0.406% due 02/02/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[6]			$ 6,100,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			0.406%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			$ 6,097,891
ProShares Ultra Gold [Member] | U.S. Treasury Bills 0.393% due 02/16/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[6]			$ 11,006,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			0.393%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			$ 11,000,014
ProShares Ultra Gold [Member] | U.S. Treasury Bills 0.493% due 03/23/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[6]			$ 27,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			0.493%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			$ 26,970,672
ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		91.00%		107.00%
Short-term U.S. government and agency obligations percentage of shareholders' equity		$ 235,581,716		$ 295,300,799
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.491% due 02/23/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[6]			$ 6,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			0.491%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			$ 5,996,005
ProShares Ultra Silver [Member] | U.S. Treasury Bills 1.080% due 02/15/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[7]	$ 20,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.08%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	$ 19,969,688
ProShares Ultra Silver [Member] | U.S. Treasury Bills 1.145% due 02/22/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[7]	$ 9,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.145%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	$ 8,984,127
ProShares Ultra Silver [Member] | U.S. Treasury Bills 1.271% due 03/15/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[7]	$ 7,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.271%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	$ 6,981,940
ProShares Ultra Silver [Member] | U.S. Treasury Bills 1.277% due 03/22/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	$ 5,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.277%
Short-term U.S. government and agency obligations percentage of shareholders' equity		$ 4,985,352
ProShares Ultra Silver [Member] | U.S. Treasury Bills 1.267% due 03/29/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[7]	$ 11,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.267%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	$ 10,964,131
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.493% due 03/23/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 18,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.493%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 17,980,448
ProShares Ultra Silver [Member] | U.S. Treasury Bills 1.001% due 01/04/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[7]	$ 39,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.001%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	$ 38,997,574
ProShares Ultra Silver [Member] | United States Treasury Bills 1.256% due 03/08/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[7]	$ 15,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.256%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	$ 14,964,792
ProShares Ultra Silver [Member] | U.S. Treasury Bills 1.001% due 01/11/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[7]	$ 15,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.001%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	$ 14,995,763
ProShares Ultra Silver [Member] | U.S. Treasury Bills 1.075% due 02/08/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[7]	$ 25,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.075%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	$ 24,968,140
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.318% due 01/05/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[6]			$ 52,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			0.318%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			$ 51,998,887
ProShares Ultra Silver [Member] | United States Treasury Bills 1.126% due 02/01/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[7]	$ 30,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.126%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	$ 29,969,001
ProShares Ultra Silver [Member] | United States Treasury Bills 1.231% due 03/01/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[7]	$ 10,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.231%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	$ 9,979,458
ProShares Ultra Silver [Member] | United States Treasury Bills 1.292% due 04/05/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	$ 50,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.292%
Short-term U.S. government and agency obligations percentage of shareholders' equity		$ 49,821,750
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.354% due 01/12/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[6]			$ 68,895,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			0.354%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			$ 68,888,200
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.339% due 01/19/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[6]			$ 27,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			0.339%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			$ 26,995,021
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.371% due 01/26/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 2,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.371%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 1,999,470
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.394% due 02/02/17 [December]
Schedule of Investments [Line Items]
Principal Amount	[1],[6]			$ 9,500,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			0.394%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			$ 9,496,715
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.452% due 02/09/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[6]			$ 76,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			0.452%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			$ 75,965,633
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.423% due 02/16/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[6]			$ 36,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			0.423%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			$ 35,980,420
ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		73.00%		84.00%
Short-term U.S. government and agency obligations percentage of shareholders' equity		$ 287,533,132		$ 434,671,795
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.491% due 02/23/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[2]			$ 8,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]			0.491%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]			$ 7,994,674
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.080% due 02/15/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[2]	$ 12,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	1.08%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	$ 11,981,813
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.267% due 03/29/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[2]	$ 11,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	1.267%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	$ 10,964,131
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.493% due 03/23/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 3,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.493%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 2,996,741
ProShares Ultra VIX Short-Term Futures ETF [Member] | United States Treasury Bills 1.256% due 03/08/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[2]	$ 25,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	1.256%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	$ 24,941,320
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.001% due 01/11/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[2]	$ 48,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	1.001%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	$ 47,986,440
ProShares Ultra VIX Short-Term Futures ETF [Member] | United States Treasury Bills 1.292% due 04/05/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[2]	$ 20,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	1.292%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	$ 19,928,700
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.174% due 01/25/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[2]	$ 34,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	1.174%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	$ 33,972,956
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.201% due 02/01/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[2]	$ 22,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	1.201%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	$ 21,977,268
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.075% due 02/08/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[2]	$ 45,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	1.075%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	$ 44,942,652
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.264% due 03/01/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[2]	$ 40,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	1.264%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	$ 39,917,832
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.319% due 03/15/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[2]	$ 31,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	1.319%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	$ 30,920,020
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.294% due 01/05/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 20,161,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.294%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 20,160,569
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.307% due 01/12/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 68,063,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.307%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 68,056,282
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.336% due 01/19/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[2]			$ 62,500,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]			0.336%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]			$ 62,488,475
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.319% due 01/26/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[2]			$ 66,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]			0.319%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]			$ 65,982,504
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.342% due 02/02/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[2]			$ 60,092,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]			0.342%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]			$ 60,071,220
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.442% due 02/09/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[2]			$ 14,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]			0.442%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]			$ 13,993,669
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.435% due 02/16/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[2]			$ 133,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]			0.435%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]			$ 132,927,661
ProShares Ultra Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		70.00%		95.00%
Short-term U.S. government and agency obligations percentage of shareholders' equity		$ 1,997,933		$ 5,282,879
ProShares Ultra Yen [Member] | U.S. Treasury Bills 0.270% due 01/12/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 480,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.27%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 479,953
ProShares Ultra Yen [Member] | U.S. Treasury Bills 1.040% due 02/01/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[5]	$ 2,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]	1.04%
Short-term U.S. government and agency obligations percentage of shareholders' equity		$ 1,997,933
ProShares Ultra Yen [Member] | U.S. Treasury Bills 0.311% due 01/26/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[5]			$ 1,655,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]			0.311%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]			$ 1,654,561
ProShares Ultra Yen [Member] | U.S. Treasury Bills 0.210% due 01/05/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[5]			$ 150,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]			0.21%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]			$ 149,997
ProShares Ultra Yen [Member] | U.S. Treasury Bills 0.390% due 02/16/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 3,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.39%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 2,998,368
ProShares UltraShort Australian Dollar [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		87.00%		78.00%
Short-term U.S. government and agency obligations percentage of shareholders' equity		$ 11,983,904		$ 12,909,619
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 1.033% due 01/18/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	$ 7,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.033%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	$ 6,996,235
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 1.209% due 02/08/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	$ 2,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.209%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	$ 1,997,451
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 1.267% due 03/29/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	$ 3,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.267%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	$ 2,990,218
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 0.326% due 01/19/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 12,912,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.326%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 129,096.19
ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		112.00%		102.00%
Short-term U.S. government and agency obligations percentage of shareholders' equity		$ 253,646,823		$ 205,694,385
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.080% due 02/15/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[3]	$ 28,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	1.08%
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.145% due 02/22/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[3]	$ 48,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	1.145%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	$ 47,915,342
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.271% due 03/15/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[3]	$ 14,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	1.271%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	$ 13,963,880
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.267% due 03/29/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[3]	$ 29,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	1.267%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	$ 28,905,437
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.493% due 03/23/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[4]			$ 3,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]			0.493%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]			$ 2,996,741
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.001% due 01/04/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[3]	$ 64,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	1.001%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	$ 63,996,019
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.040% due 02/01/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[3]	$ 28,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	1.04%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	$ 27,971,068
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.075% due 02/08/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[3]	$ 17,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	1.075%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	$ 16,978,335
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.390% due 02/16/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 11,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.39%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 10,994,017
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.068% due 01/25/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[3]	$ 10,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	1.068%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	$ 9,992,046
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.264% due 03/01/18n [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[3]	$ 16,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	1.264%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	$ 15,967,133
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.080% due February 15, 2017 [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	$ 27,957,563
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.281% due 01/05/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[4]			$ 14,476,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]			0.281%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]			$ 14,475,690
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.353% due 01/12/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[4]			$ 56,495,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]			0.353%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]			$ 56,489,424
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.344% due 01/19/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[4]			$ 38,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]			0.344%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]			$ 37,992,993
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.395% due 01/26/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[4]			$ 13,300,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]			0.395%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]			$ 13,296,474
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.406% due 02/02/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 5,500,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.406%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]			$ 5,498,098
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.441% due 02/09/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[4]			$ 9,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]			0.441%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]			$ 8,995,930
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.458% due 03/02/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[4]			$ 50,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]			0.458%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]			$ 49,960,930
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.516% due 03/30/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[4]			$ 5,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]			0.516%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]			$ 4,994,088
ProShares UltraShort Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		58.00%		72.00%
Short-term U.S. government and agency obligations percentage of shareholders' equity		$ 3,999,751		$ 2,899,151
ProShares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 1.000% due 01/04/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	$ 4,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.00%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	$ 3,999,751
ProShares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.406% due 02/02/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 1,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.406%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 999,654
ProShares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.343% due 01/26/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 1,900,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.343%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 1,899,497
ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		101.00%		97.00%
Short-term U.S. government and agency obligations percentage of shareholders' equity		$ 204,770,166		$ 337,375,787
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.491% due 02/23/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[5]			$ 45,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]			0.491%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]			$ 44,970,039
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 1.080% due 02/15/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[5]	$ 25,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]	1.08%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]	$ 24,962,110
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 1.145% due 02/22/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	$ 12,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.145%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	$ 11,978,836
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 1.155% due 03/01/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[5]	$ 26,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]	1.155%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]	$ 25,946,591
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 1.256% due 03/08/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[5]	$ 18,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]	1.256%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]	$ 17,957,750
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.493% due 03/23/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[5]			$ 45,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]			0.493%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]			$ 44,951,121
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 1.001% due 01/04/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	$ 20,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.001%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	$ 19,998,756
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 1.001% due 01/11/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[5]	$ 25,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]	1.001%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]	$ 24,992,937
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 1.040% due 02/01/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[5]	$ 30,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]	1.04%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]	$ 29,969,001
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 1.075% due 02/08/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[5]	$ 9,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]	1.075%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]	$ 8,988,530
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.390% due 02/16/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 33,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.39%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 32,982,051
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 1.068% due 01/25/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[5]	$ 11,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]	1.068%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]	$ 10,991,251
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 1.081% due 01/18/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[5]	$ 29,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]	1.081%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]	$ 28,984,404
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.286% due 01/05/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[5]			$ 35,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]			0.286%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]			$ 34,999,251
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.421% due 01/12/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[5]			$ 39,020,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]			0.421%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]			$ 39,016,149
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.342% due 01/19/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 4,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.342%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 3,999,263
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.350% due 01/26/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[5]			$ 68,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]			0.35%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]			$ 67,981,973
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.391% due 02/02/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[5]			$ 65,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]			0.391%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]			$ 64,977,523
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.471% due 02/09/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 3,500,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.471%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 3,498,417
ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		102.00%		95.00%
Short-term U.S. government and agency obligations percentage of shareholders' equity		$ 31,977,900		$ 60,540,555
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.491% due 02/23/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[6]			$ 5,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			0.491%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			$ 4,996,671
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 1.267% due 03/29/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[7]	$ 2,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.267%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	$ 1,993,478
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.493% due 03/23/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 2,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.493%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 1,997,828
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 1.001% due 01/04/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[7]	$ 14,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.001%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	$ 13,999,129
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 1.001% due 01/11/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[7]	$ 5,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.001%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	$ 4,998,588
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 1.040% due 02/01/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[7]	$ 3,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.04%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	$ 2,996,900
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.435% due 01/12/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 1,572,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.435%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 1,571,845
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 1.075% due 02/08/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[7]	$ 8,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.075%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	$ 7,989,805
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.371% due 01/26/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 10,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.371%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 9,997,349
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.308% due 01/19/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[6]			$ 1,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			0.308%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			$ 999,815
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.407% due 02/02/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 13,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.407%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 12,995,504
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.406% due 02/16/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[6]			$ 18,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			0.406%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			$ 17,990,210
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.481% due 03/09/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[6]			$ 10,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			0.481%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			$ 9,991,333
ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		124.00%		94.00%
Short-term U.S. government and agency obligations percentage of shareholders' equity		$ 18,349,861		$ 21,550,319
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 1.033% due 01/18/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[7]	$ 2,181,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.033%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	$ 2,179,827
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.491% due 02/23/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[6]			$ 2,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			0.491%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[6],[8]			$ 1,998,668
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 1.209% due 02/08/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[7]	$ 2,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.209%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	$ 1,997,451
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 1.267% due 03/29/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[7]	$ 12,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.267%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	$ 11,960,871
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.493% due 03/23/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[6]			$ 2,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			0.493%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[6],[8]			$ 1,997,828
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 1.040% due 02/01/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[7]	$ 2,214,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.04%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	$ 2,211,712
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.371% due 01/26/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 1,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.371%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[8]			$ 999,735
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.339% due 01/12/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[6]			$ 5,759,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			0.339%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[6],[8]			$ 5,758,432
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.455% due 01/19/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 1,500,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.455%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[8]			$ 1,499,723
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.409% due 02/02/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 1,300,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.409%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[8]			$ 1,299,551
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.452% due 02/09/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[6]			$ 8,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]			0.452%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[6],[8]			$ 7,996,382
ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		101.00%		93.00%
Short-term U.S. government and agency obligations percentage of shareholders' equity		$ 131,834,352		$ 257,102,313
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 1.033% due 01/18/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[5]	$ 19,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]	1.033%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]	$ 18,989,782
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.491% due 02/23/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[5]			$ 15,900,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]			0.491%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]			$ 15,889,414
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 1.080% due 02/15/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	$ 9,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.08%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	$ 8,986,360
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 1.256% due 03/08/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[5]	$ 15,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]	1.256%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]	$ 14,964,792
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 1.277% due 03/22/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	$ 6,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.277%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	$ 5,982,422
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 1.001% due 01/04/18 [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	6,999,565
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 1.000% due 01/04/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	$ 7,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.00%
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 1.001% due 01/11/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	$ 9,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.001%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	$ 8,997,457
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 1.040% due 02/01/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[5]	$ 24,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]	1.04%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]	$ 23,975,201
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.393% due 02/16/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 53,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.393%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 52,971,173
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 1.264% due 03/01/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	$ 15,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.264%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	$ 14,969,187
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 1.068% due 01/25/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[5]	$ 11,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]	1.068%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]	$ 10,991,251
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.286% due 01/05/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[5]			$ 21,383,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]			0.286%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]			$ 21,382,543
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.452% due 02/09/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[5]			$ 35,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]			0.452%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]			$ 34,984,173
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 1.083% due 02/08/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[5]	$ 17,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]	1.083%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]	$ 16,978,335
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.343% due 01/12/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[5]			$ 32,400,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]			0.343%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]			$ 32,396,802
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.405% due 01/19/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[5]			$ 12,500,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]			0.405%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]			$ 12,497,695
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.346% due 01/26/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[5]			$ 57,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]			0.346%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]			$ 56,984,889
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.390% due 02/02/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[5]			$ 30,006,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]			0.39%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]			$ 29,995,624
ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		80.00%		99.00%
Short-term U.S. government and agency obligations percentage of shareholders' equity		$ 20,993,515	[1]	$ 45,486,235
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.491% due 02/23/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[2]			$ 4,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]			0.491%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]			$ 3,997,337
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 1.209% due 02/08/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	$ 3,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.209%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	$ 2,996,177
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 1.000% due 01/04/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	$ 11,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.00%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	$ 10,999,316
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 1.001% due 01/11/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	$ 7,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.001%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	$ 6,998,022
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.311% due 01/26/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 1,500,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.311%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 1,499,602
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.299% due 01/19/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 2,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.299%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 1,999,631
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.390% due 02/16/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 6,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.39%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 5,996,737
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.281% due 01/05/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 1,500,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.281%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 1,499,968
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.390% due 01/12/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 18,500,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.39%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 18,498,174
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.411% due 02/02/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 2,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.411%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 1,999,308
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.372% due 02/09/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[2]			$ 10,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]			0.372%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]			$ 9,995,478
ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		98.00%		85.00%
Short-term U.S. government and agency obligations percentage of shareholders' equity		$ 134,845,604		$ 147,991,233
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.080% due 02/15/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[2]	$ 34,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	1.08%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	$ 33,948,470
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.271% due 03/15/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[2]	$ 23,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	1.271%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	$ 22,940,660
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.493% due 03/23/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 37,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.493%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 36,959,810
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.000% due 01/04/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	$ 31,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.00%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	$ 30,998,072
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.001% due 01/11/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[2]	$ 12,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	1.001%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	$ 11,996,610
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.040% due 02/01/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[2]	$ 33,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	1.04%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	$ 32,965,901
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.264% due 03/01/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[2]	$ 2,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	1.264%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	$ 1,995,891
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.390% due 02/16/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]			$ 10,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			0.39%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]			$ 9,994,561
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.409% due 02/02/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[2]			$ 32,560,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]			0.409%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]			$ 32,548,741
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.382% due 01/12/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[2]			$ 39,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]			0.382%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]			$ 38,996,151
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.330% due 01/19/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[2]			$ 9,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]			0.33%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]			$ 8,998,340
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.353% due 01/26/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[2]			$ 15,500,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]			0.353%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]			$ 15,495,891
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.425% due 02/09/17 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[2]			$ 5,000,000
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]			0.425%
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]			$ 4,997,739
[1]	Rates shown represents discount rate at the time of purchase.
[2]	All or partial amount pledged as collateral for futures contracts.
[3]	All or partial amount pledged as collateral for swap agreements.
[4]	All or partial amount pledged as collateral for swap agreements and/or futures contracts.
[5]	All or partial amount pledged as collateral for foreign currency forward contracts.
[6]	All or partial amount pledged as collateral for forward agreements and/or futures contracts.
[7]	All or partial amount pledged as collateral for forward agreements.
[8]	The positions and counterparties herein are as of December 31, 2017. The Funds continually evaluate different counterparties for their transactions and counterparties are subject to change. New counterparties can be added at any time.

Schedule of Investments - Sho24

Schedule of Investments - Short-Term U.S. Government and Agency Obligations (Parenthetical) (Detail) - USD ($)		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Schedule of Investments [Line Items]
Total short-term U.S. government and agency obligations, cost		$ 2,445,970,899	$ 3,038,837,465
ProShares Short Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		88.00%	83.00%
Total short-term U.S. government and agency obligations, cost		$ 6,996,595	$ 13,164,807
ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		64.00%	75.00%
Total short-term U.S. government and agency obligations, cost		$ 494,962,509	$ 170,391,741
ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		88.00%	95.00%
Total short-term U.S. government and agency obligations, cost		$ 459,543,053	$ 885,046,303
ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		81.00%	84.00%
Total short-term U.S. government and agency obligations, cost		$ 50,963,586	$ 36,183,384
ProShares Ultra Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		73.00%	100.00%
Total short-term U.S. government and agency obligations, cost		$ 6,996,595	$ 11,891,729
ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		95.00%	104.00%
Total short-term U.S. government and agency obligations, cost		$ 88,890,367	$ 95,356,703
ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		91.00%	107.00%
Total short-term U.S. government and agency obligations, cost		$ 235,605,469	$ 295,296,440
ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		73.00%	84.00%
Total short-term U.S. government and agency obligations, cost		$ 287,546,397	$ 434,676,067
ProShares Ultra Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		70.00%	95.00%
Total short-term U.S. government and agency obligations, cost		$ 1,998,216	$ 5,283,104
ProShares UltraShort Australian Dollar [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		87.00%	78.00%
Total short-term U.S. government and agency obligations, cost		$ 11,984,898	$ 12,909,895
ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		112.00%	102.00%
Total short-term U.S. government and agency obligations, cost		$ 253,669,155	$ 205,694,828
ProShares UltraShort Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		58.00%	72.00%
Total short-term U.S. government and agency obligations, cost		$ 3,999,667	$ 2,899,188
ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		101.00%	97.00%
Total short-term U.S. government and agency obligations, cost		$ 204,788,208	$ 337,373,566
ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		102.00%	95.00%
Total short-term U.S. government and agency obligations, cost		$ 31,979,626	$ 60,540,275
ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		124.00%	94.00%
Total short-term U.S. government and agency obligations, cost		$ 18,352,808	$ 21,549,766
ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		101.00%	93.00%
Total short-term U.S. government and agency obligations, cost		$ 131,844,652	$ 257,103,135
ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		80.00%	99.00%
Total short-term U.S. government and agency obligations, cost		$ 20,993,328	$ 45,486,489
ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		98.00%	85.00%
Total short-term U.S. government and agency obligations, cost		$ 134,855,770	$ 147,990,045
U.S. Treasury Bills 1.033% due 01/18/18 [Member] | ProShares Short Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.033%
Debt instrument, maturity date	[1]	Jan. 18, 2018
U.S. Treasury Bills 1.033% due 01/18/18 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	1.033%
Debt instrument, maturity date	[1],[2]	Jan. 18, 2018
U.S. Treasury Bills 1.033% due 01/18/18 [Member] | ProShares Ultra Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	1.033%
Debt instrument, maturity date	[1]	Jan. 18, 2018
U.S. Treasury Bills 1.033% due 01/18/18 [Member] | ProShares UltraShort Australian Dollar [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.033%
Debt instrument, maturity date	[1]	Jan. 18, 2018
U.S. Treasury Bills 1.033% due 01/18/18 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]	1.033%
Debt instrument, maturity date	[1],[4]	Jan. 18, 2018
U.S. Treasury Bills 1.033% due 01/18/18 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	1.033%
Debt instrument, maturity date	[1],[3]	Jan. 18, 2018
U.S. Treasury Bills 0.270% due 01/12/17 [Member] | ProShares Short Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.27%
Debt instrument, maturity date	[1]		Jan. 12, 2017
U.S. Treasury Bills 0.270% due 01/12/17 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]		0.27%
Debt instrument, maturity date	[1],[5]		Jan. 12, 2017
U.S. Treasury Bills 0.270% due 01/12/17 [Member] | ProShares Ultra Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.27%
Debt instrument, maturity date	[1]		Jan. 12, 2017
U.S. Treasury Bills 0.270% due 01/12/17 [Member] | ProShares Ultra Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.27%
Debt instrument, maturity date	[1]		Jan. 12, 2017
U.S. Treasury Bills 0.355% due 01/19/17 [Member] | ProShares Short Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.355%
Debt instrument, maturity date	[1]		Jan. 19, 2017
U.S. Treasury Bills 0.355% due 01/19/17 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]		0.355%
Debt instrument, maturity date	[1],[6]		Jan. 19, 2017
U.S. Treasury Bills 0.491% due 02/23/17 [Member] | ProShares Short Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.491%
Debt instrument, maturity date	[1]		Feb. 23, 2017
U.S. Treasury Bills 0.491% due 02/23/17 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]		0.491%
Debt instrument, maturity date	[1],[5]		Feb. 23, 2017
U.S. Treasury Bills 0.491% due 02/23/17 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.491%
Debt instrument, maturity date	[1]		Feb. 23, 2017
U.S. Treasury Bills 0.491% due 02/23/17 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]		0.491%
Debt instrument, maturity date	[1],[6]		Feb. 23, 2017
U.S. Treasury Bills 0.491% due 02/23/17 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]		0.491%
Debt instrument, maturity date	[1],[6]		Feb. 23, 2017
U.S. Treasury Bills 0.491% due 02/23/17 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]		0.491%
Debt instrument, maturity date	[1],[7]		Feb. 23, 2017
U.S. Treasury Bills 0.491% due 02/23/17 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]		0.491%
Debt instrument, maturity date	[1],[3]		Feb. 23, 2017
U.S. Treasury Bills 0.491% due 02/23/17 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]		0.491%
Debt instrument, maturity date	[1],[6]		Feb. 23, 2017
U.S. Treasury Bills 0.491% due 02/23/17 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]		0.491%
Debt instrument, maturity date	[1],[6]		Feb. 23, 2017
U.S. Treasury Bills 0.491% due 02/23/17 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]		0.491%
Debt instrument, maturity date	[1],[3]		Feb. 23, 2017
U.S. Treasury Bills 0.491% due 02/23/17 [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]		0.491%
Debt instrument, maturity date	[1],[7]		Feb. 23, 2017
U.S. Treasury Bills 1.209% due 02/08/18 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.209%
Debt instrument, maturity date	[1],[7]	Feb. 8, 2018
U.S. Treasury Bills 1.209% due 02/08/18 [Member] | ProShares UltraShort Australian Dollar [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.209%
Debt instrument, maturity date	[1]	Feb. 8, 2018
U.S. Treasury Bills 1.209% due 02/08/18 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]	1.209%
Debt instrument, maturity date	[1],[4]	Feb. 8, 2018
U.S. Treasury Bills 1.209% due 02/08/18 [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.209%
Debt instrument, maturity date	[1]	Feb. 8, 2018
U.S. Treasury Bills 1.080% due 02/15/18 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.08%
Debt instrument, maturity date	[1]	Feb. 15, 2018
U.S. Treasury Bills 1.080% due 02/15/18 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	1.08%
Debt instrument, maturity date	[1],[2]	Feb. 15, 2018
U.S. Treasury Bills 1.080% due 02/15/18 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]	1.08%
Debt instrument, maturity date	[1],[4]	Feb. 15, 2018
U.S. Treasury Bills 1.080% due 02/15/18 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]	1.08%
Debt instrument, maturity date	[1],[4]	Feb. 15, 2018
U.S. Treasury Bills 1.080% due 02/15/18 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.08%
Debt instrument, maturity date	[1],[7]	Feb. 15, 2018
U.S. Treasury Bills 1.080% due 02/15/18 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	1.08%
Debt instrument, maturity date	[1],[2]	Feb. 15, 2018
U.S. Treasury Bills 1.080% due 02/15/18 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	1.08%
Debt instrument, maturity date	[1],[3]	Feb. 15, 2018
U.S. Treasury Bills 1.080% due 02/15/18 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.08%
Debt instrument, maturity date	[1]	Feb. 15, 2018
U.S. Treasury Bills 1.080% due 02/15/18 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.08%
Debt instrument, maturity date	[1],[7]	Feb. 15, 2018
U.S. Treasury Bills 1.145% due 02/22/18 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.145%
Debt instrument, maturity date	[1],[7]	Feb. 22, 2018
U.S. Treasury Bills 1.145% due 02/22/18 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	1.145%
Debt instrument, maturity date	[1],[2]	Feb. 22, 2018
U.S. Treasury Bills 1.145% due 02/22/18 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]	1.145%
Debt instrument, maturity date	[1],[4]	Feb. 22, 2018
U.S. Treasury Bills 1.145% due 02/22/18 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	1.145%
Debt instrument, maturity date	[1],[2]	Feb. 22, 2018
U.S. Treasury Bills 1.145% due 02/22/18 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.145%
Debt instrument, maturity date	[1]	Feb. 22, 2018
U.S. Treasury Bills 1.155% due 03/01/18 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.155%
Debt instrument, maturity date	[1]	Mar. 1, 2018
U.S. Treasury Bills 1.155% due 03/01/18 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	1.155%
Debt instrument, maturity date	[1],[3]	Mar. 1, 2018
U.S. Treasury Bills 1.256% due 03/08/18 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.256%
Debt instrument, maturity date	[1]	Mar. 8, 2018
U.S. Treasury Bills 1.256% due 03/08/18 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	1.256%
Debt instrument, maturity date	[1],[3]	Mar. 8, 2018
U.S. Treasury Bills 1.256% due 03/08/18 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	1.256%
Debt instrument, maturity date	[1],[3]	Mar. 8, 2018
U.S. Treasury Bills 1.271% due 03/15/18 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.271%
Debt instrument, maturity date	[1]	Mar. 15, 2018
U.S. Treasury Bills 1.271% due 03/15/18 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.271%
Debt instrument, maturity date	[1]	Mar. 15, 2018
U.S. Treasury Bills 1.271% due 03/15/18 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]	1.271%
Debt instrument, maturity date	[1],[4]	Mar. 15, 2018
U.S. Treasury Bills 1.271% due 03/15/18 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	1.271%
Debt instrument, maturity date	[1],[2]	Mar. 15, 2018
U.S. Treasury Bills 1.271% due 03/15/18 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.271%
Debt instrument, maturity date	[1],[7]	Mar. 15, 2018
U.S. Treasury Bills 1.277% due 03/22/18 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.277%
Debt instrument, maturity date	[1]	Mar. 22, 2018
U.S. Treasury Bills 1.277% due 03/22/18 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.277%
Debt instrument, maturity date	[1]	Mar. 22, 2018
U.S. Treasury Bills 1.277% due 03/22/18 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.277%
Debt instrument, maturity date	[1]	Mar. 22, 2018
U.S. Treasury Bills 1.267% due 03/29/18 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.267%
Debt instrument, maturity date	[1]	Mar. 29, 2018
U.S. Treasury Bills 1.267% due 03/29/18 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]	1.267%
Debt instrument, maturity date	[1],[4]	Mar. 29, 2018
U.S. Treasury Bills 1.267% due 03/29/18 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]	1.267%
Debt instrument, maturity date	[1],[4]	Mar. 29, 2018
U.S. Treasury Bills 1.267% due 03/29/18 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.267%
Debt instrument, maturity date	[1],[7]	Mar. 29, 2018
U.S. Treasury Bills 1.267% due 03/29/18 [Member] | ProShares UltraShort Australian Dollar [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.267%
Debt instrument, maturity date	[1]	Mar. 29, 2018
U.S. Treasury Bills 1.267% due 03/29/18 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	1.267%
Debt instrument, maturity date	[1],[2]	Mar. 29, 2018
U.S. Treasury Bills 1.267% due 03/29/18 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]	1.267%
Debt instrument, maturity date	[1],[4]	Mar. 29, 2018
U.S. Treasury Bills 1.267% due 03/29/18 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]	1.267%
Debt instrument, maturity date	[1],[4]	Mar. 29, 2018
U.S. Treasury Bills 0.471% due 02/09/17 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.471%
Debt instrument, maturity date	[1]		Feb. 9, 2017
U.S. Treasury Bills 0.437% due 02/16/17 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]		0.437%
Debt instrument, maturity date	[1],[7]		Feb. 16, 2017
U.S. Treasury Bills 0.493% due 03/23/17 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.493%
Debt instrument, maturity date	[1]		Mar. 23, 2017
U.S. Treasury Bills 0.493% due 03/23/17 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]		0.493%
Debt instrument, maturity date	[1],[5]		Mar. 23, 2017
U.S. Treasury Bills 0.493% due 03/23/17 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.493%
Debt instrument, maturity date	[1]		Mar. 23, 2017
U.S. Treasury Bills 0.493% due 03/23/17 [Member] | ProShares Ultra Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.493%
Debt instrument, maturity date	[1]		Mar. 23, 2017
U.S. Treasury Bills 0.493% due 03/23/17 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.493%
Debt instrument, maturity date	[1]		Mar. 23, 2017
U.S. Treasury Bills 0.493% due 03/23/17 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.493%
Debt instrument, maturity date	[1]		Mar. 23, 2017
U.S. Treasury Bills 0.493% due 03/23/17 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]		0.493%
Debt instrument, maturity date	[1],[5]		Mar. 23, 2017
U.S. Treasury Bills 0.493% due 03/23/17 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]		0.493%
Debt instrument, maturity date	[1],[3]		Mar. 23, 2017
U.S. Treasury Bills 0.493% due 03/23/17 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.493%
Debt instrument, maturity date	[1]		Mar. 23, 2017
U.S. Treasury Bills 0.493% due 03/23/17 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]		0.493%
Debt instrument, maturity date	[1],[6]		Mar. 23, 2017
U.S. Treasury Bills 0.493% due 03/23/17 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.493%
Debt instrument, maturity date	[1]		Mar. 23, 2017
U.S. Treasury Bills 1.001% due 01/04/18 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	1.001%
Debt instrument, maturity date	[1],[2]	Jan. 4, 2018
U.S. Treasury Bills 1.001% due 01/04/18 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]	1.001%
Debt instrument, maturity date	[1],[4]	Jan. 4, 2018
U.S. Treasury Bills 1.001% due 01/04/18 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	1.001%
Debt instrument, maturity date	[1],[2]	Jan. 4, 2018
U.S. Treasury Bills 1.001% due 01/04/18 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.001%
Debt instrument, maturity date	[1]	Jan. 4, 2018
U.S. Treasury Bills 1.001% due 01/04/18 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]	1.001%
Debt instrument, maturity date	[1],[4]	Jan. 4, 2018
United States Treasury Bills 1.022% due 01/11/18 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	1.022%
Debt instrument, maturity date	[1],[2]	Jan. 11, 2018
United States Treasury Bills 1.082% due 01/25/18 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	1.082%
Debt instrument, maturity date	[1],[2]	Jan. 25, 2018
United States Treasury Bills 1.146% due 02/01/18 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	1.146%
Debt instrument, maturity date	[1],[2]	Feb. 1, 2018
United States Treasury Bills 1.118% due 02/08/18 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	1.118%
Debt instrument, maturity date	[1],[2]	Feb. 8, 2018
United States Treasury Bills1.223% due 03/01/18 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	1.223%
Debt instrument, maturity date	[1],[2]	Mar. 1, 2018
United States Treasury Bills 1.256% due 03/08/18 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	1.256%
Debt instrument, maturity date	[1],[2]	Mar. 8, 2018
United States Treasury Bills 1.256% due 03/08/18 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]	1.256%
Debt instrument, maturity date	[1],[4]	Mar. 8, 2018
United States Treasury Bills 1.256% due 03/08/18 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.256%
Debt instrument, maturity date	[1],[7]	Mar. 8, 2018
U.S. Treasury Bills 0.289% due 01/05/17 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]		0.289%
Debt instrument, maturity date	[1],[5]		Jan. 5, 2017
U.S. Treasury Bills 0.371% due 01/19/17 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]		0.371%
Debt instrument, maturity date	[1],[5]		Jan. 19, 2017
U.S. Treasury Bills 0.362% due 01/26/17 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]		0.362%
Debt instrument, maturity date	[1],[5]		Jan. 26, 2017
U.S. Treasury Bills 0.418% due 02/02/17 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]		0.418%
Debt instrument, maturity date	[1],[5]		Feb. 2, 2017
U.S. Treasury Bills 0.400% due 02/09/17 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]		0.40%
Debt instrument, maturity date	[1],[5]		Feb. 9, 2017
U.S. Treasury Bills 0.420% due 02/16/17 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]		0.42%
Debt instrument, maturity date	[1],[5]		Feb. 16, 2017
U.S. Treasury Bills 0.481% due 03/09/17 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]		0.481%
Debt instrument, maturity date	[1],[5]		Mar. 9, 2017
U.S. Treasury Bills 1.000% due 01/04/18 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.00%
Debt instrument, maturity date	[1]	Jan. 4, 2018
U.S. Treasury Bills 1.000% due 01/04/18 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.00%
Debt instrument, maturity date	[1]	Jan. 4, 2018
U.S. Treasury Bills 1.000% due 01/04/18 [Member] | ProShares UltraShort Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.00%
Debt instrument, maturity date	[1]	Jan. 4, 2018
U.S. Treasury Bills 1.000% due 01/04/18 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.00%
Debt instrument, maturity date	[1]	Jan. 4, 2018
U.S. Treasury Bills 1.000% due 01/04/18 [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.00%
Debt instrument, maturity date	[1]	Jan. 4, 2018
U.S. Treasury Bills 1.000% due 01/04/18 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.00%
Debt instrument, maturity date	[1]	Jan. 4, 2018
U.S. Treasury Bills 1.001% due 01/11/18 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.001%
Debt instrument, maturity date	[1]	Jan. 11, 2018
U.S. Treasury Bills 1.001% due 01/11/18 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]	1.001%
Debt instrument, maturity date	[1],[4]	Nov. 1, 2018
U.S. Treasury Bills 1.001% due 01/11/18 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]	1.001%
Debt instrument, maturity date	[1],[4]	Jan. 11, 2018
U.S. Treasury Bills 1.001% due 01/11/18 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.001%
Debt instrument, maturity date	[1],[7]	Jan. 11, 2018
U.S. Treasury Bills 1.001% due 01/11/18 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	1.001%
Debt instrument, maturity date	[1],[3]	Jan. 11, 2018
U.S. Treasury Bills 1.001% due 01/11/18 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]	1.001%
Debt instrument, maturity date	[1],[4]	Jan. 11, 2018
U.S. Treasury Bills 1.001% due 01/11/18 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.001%
Debt instrument, maturity date	[1]	Jan. 11, 2018
U.S. Treasury Bills 1.001% due 01/11/18 [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.001%
Debt instrument, maturity date	[1]	Jan. 11, 2018
U.S. Treasury Bills 1.001% due 01/11/18 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.001%
Debt instrument, maturity date	[1],[7]	Jan. 11, 2018
U.S. Treasury Bills 1.033% due 01/18/18 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.033%
Debt instrument, maturity date	[1]	Jan. 18, 2018
U.S. Treasury Bills 1.033% due 01/18/18 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]	1.033%
Debt instrument, maturity date	[1],[4]	Jan. 18, 2018
U.S. Treasury Bills 1.040% due 02/01/18 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.04%
Debt instrument, maturity date	[1]	Feb. 1, 2018
U.S. Treasury Bills 1.040% due 02/01/18 [Member] | ProShares Ultra Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	1.04%
Debt instrument, maturity date	[1],[3]	Feb. 1, 2018
U.S. Treasury Bills 1.040% due 02/01/18 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	1.04%
Debt instrument, maturity date	[1],[2]	Feb. 1, 2018
U.S. Treasury Bills 1.040% due 02/01/18 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	1.04%
Debt instrument, maturity date	[1],[3]	Feb. 1, 2018
U.S. Treasury Bills 1.040% due 02/01/18 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]	1.04%
Debt instrument, maturity date	[1],[4]	Feb. 1, 2018
U.S. Treasury Bills 1.040% due 02/01/18 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]	1.04%
Debt instrument, maturity date	[1],[4]	Feb. 1, 2018
U.S. Treasury Bills 1.040% due 02/01/18 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	1.04%
Debt instrument, maturity date	[1],[3]	Feb. 1, 2018
U.S. Treasury Bills 1.040% due 02/01/18 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.04%
Debt instrument, maturity date	[1],[7]	Feb. 1, 2018
United States Treasury Bills 1.145% due 02/22/18 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.145%
Debt instrument, maturity date	[1]	Feb. 22, 2018
U.S. Treasury Bills 0.435% due 01/12/17 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.435%
Debt instrument, maturity date	[1]		Jan. 12, 2017
U.S. Treasury Bills 0.435% due 01/12/17 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.435%
Debt instrument, maturity date	[1]		Jan. 12, 2017
U.S. Treasury Bills 0.345% due 01/19/17 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.345%
Debt instrument, maturity date	[1]		Jan. 19, 2017
U.S. Treasury Bills 0.311% due 01/26/17 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.311%
Debt instrument, maturity date	[1]		Jan. 26, 2017
U.S. Treasury Bills 0.311% due 01/26/17 [Member] | ProShares Ultra Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]		0.311%
Debt instrument, maturity date	[1],[3]		Jan. 26, 2017
U.S. Treasury Bills 0.311% due 01/26/17 [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.311%
Debt instrument, maturity date	[1]		Jan. 26, 2017
U.S. Treasury Bills 0.403% due 02/02/17 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.403%
Debt instrument, maturity date	[1]		Feb. 2, 2017
U.S. Treasury Bills 0.425% due 02/09/17 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.425%
Debt instrument, maturity date	[1]		Feb. 9, 2017
U.S. Treasury Bills 0.440% due 02/16/17 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.44%
Debt instrument, maturity date	[1]		Feb. 16, 2017
U.S. Treasury Bills 0.295% due 01/05/17 [Member] | ProShares Ultra Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]		0.295%
Debt instrument, maturity date	[1],[3]		Jan. 5, 2017
U.S. Treasury Bills 0.299% due 01/19/17 [Member] | ProShares Ultra Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]		0.299%
Debt instrument, maturity date	[1],[3]		Jan. 19, 2017
U.S. Treasury Bills 0.299% due 01/19/17 [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.299%
Debt instrument, maturity date	[1]		Jan. 19, 2017
U.S. Treasury Bills 1.075% due 02/08/18 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]	1.075%
Debt instrument, maturity date	[1],[4]	Feb. 8, 2018
U.S. Treasury Bills 1.075% due 02/08/18 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]	1.075%
Debt instrument, maturity date	[1],[4]	Feb. 8, 2018
U.S. Treasury Bills 1.075% due 02/08/18 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	1.075%
Debt instrument, maturity date	[1],[2]	Feb. 8, 2018
U.S. Treasury Bills 1.075% due 02/08/18 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	1.075%
Debt instrument, maturity date	[1],[3]	Feb. 8, 2018
U.S. Treasury Bills 1.075% due 02/08/18 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]	1.075%
Debt instrument, maturity date	[1],[4]	Feb. 8, 2018
U.S. Treasury Bills 1.298% due 03/15/18 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]	1.298%
Debt instrument, maturity date	[1],[4]	Mar. 15, 2018
U.S. Treasury Bills 0.318% due 01/05/17 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]		0.318%
Debt instrument, maturity date	[1],[6]		Jan. 5, 2017
U.S. Treasury Bills 0.318% due 01/05/17 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]		0.318%
Debt instrument, maturity date	[1],[6]		Jan. 5, 2017
U.S. Treasury Bills 0.276% due 01/12/17 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]		0.276%
Debt instrument, maturity date	[1],[6]		Jan. 12, 2017
U.S. Treasury Bills 0.360% due 01/26/17 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]		0.36%
Debt instrument, maturity date	[1],[6]		Jan. 26, 2017
U.S. Treasury Bills 0.406% due 02/02/17 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]		0.406%
Debt instrument, maturity date	[1],[6]		Feb. 2, 2017
U.S. Treasury Bills 0.393% due 02/16/17 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]		0.393%
Debt instrument, maturity date	[1],[6]		Feb. 16, 2017
U.S. Treasury Bills 0.393% due 02/16/17 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.393%
Debt instrument, maturity date	[1]		Feb. 16, 2017
U.S. Treasury Bills 0.493% due 03/23/17 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]		0.493%
Debt instrument, maturity date	[1],[6]		Mar. 23, 2017
United States Treasury Bills 1.126% due 02/01/18 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]	1.126%
Debt instrument, maturity date	[1],[4]	Feb. 1, 2018
United States Treasury Bills 1.231% due 03/01/18 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[4]	1.231%
Debt instrument, maturity date	[1],[4]	Mar. 1, 2018
United States Treasury Bills 1.292% due 04/05/18 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.292%
Debt instrument, maturity date	[1]	Apr. 5, 2018
United States Treasury Bills 1.292% due 04/05/18 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.292%
Debt instrument, maturity date	[1],[7]	Apr. 5, 2018
U.S. Treasury Bills 0.354% due 01/12/17 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]		0.354%
Debt instrument, maturity date	[1],[6]		Jan. 12, 2017
U.S. Treasury Bills 0.339% due 01/19/17 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]		0.339%
Debt instrument, maturity date	[1],[6]		Jan. 19, 2017
U.S. Treasury Bills 0.371% due 01/26/17 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.371%
Debt instrument, maturity date	[1]		Jan. 26, 2017
U.S. Treasury Bills 0.371% due 01/26/17 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.371%
Debt instrument, maturity date	[1]		Jan. 26, 2017
U.S. Treasury Bills 0.371% due 01/26/17 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.371%
Debt instrument, maturity date	[1]		Jan. 26, 2017
U.S. Treasury Bills 0.394% due 02/02/17 [December] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]		0.394%
Debt instrument, maturity date	[1],[6]		Feb. 2, 2017
U.S. Treasury Bills 0.452% due 02/09/17 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]		0.452%
Debt instrument, maturity date	[1],[6]		Feb. 9, 2017
U.S. Treasury Bills 0.423% due 02/16/17 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]		0.423%
Debt instrument, maturity date	[1],[6]		Feb. 16, 2017
U.S. Treasury Bills 1.174% due 01/25/18 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.174%
Debt instrument, maturity date	[1],[7]	Jan. 25, 2018
U.S. Treasury Bills 1.201% due 02/01/18 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.201%
Debt instrument, maturity date	[1],[7]	Feb. 1, 2018
U.S. Treasury Bills 1.075% due 02/08/18 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.075%
Debt instrument, maturity date	[1],[7]	Feb. 8, 2018
U.S. Treasury Bills 1.264% due 03/01/18 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.264%
Debt instrument, maturity date	[1],[7]	Mar. 1, 2018
U.S. Treasury Bills 1.264% due 03/01/18 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]	1.264%
Debt instrument, maturity date	[1]	Mar. 1, 2018
U.S. Treasury Bills 1.264% due 03/01/18 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.264%
Debt instrument, maturity date	[1],[7]	Mar. 1, 2018
U.S. Treasury Bills 1.319% due 03/15/18 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]	1.319%
Debt instrument, maturity date	[1],[7]	Mar. 15, 2018
U.S. Treasury Bills 0.294% due 01/05/17 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.294%
Debt instrument, maturity date	[1]		Jan. 5, 2017
U.S. Treasury Bills 0.307% due 01/12/17 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.307%
Debt instrument, maturity date	[1]		Jan. 12, 2017
U.S. Treasury Bills 0.336% due 01/19/17 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]		0.336%
Debt instrument, maturity date	[1],[7]		Jan. 19, 2017
U.S. Treasury Bills 0.319% due 01/26/17 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]		0.319%
Debt instrument, maturity date	[1],[7]		Jan. 26, 2017
U.S. Treasury Bills 0.342% due 02/02/17 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]		0.342%
Debt instrument, maturity date	[1],[7]		Feb. 2, 2017
U.S. Treasury Bills 0.442% due 02/09/17 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]		0.442%
Debt instrument, maturity date	[1],[7]		Feb. 9, 2017
U.S. Treasury Bills 0.435% due 02/16/17 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]		0.435%
Debt instrument, maturity date	[1],[7]		Feb. 16, 2017
U.S. Treasury Bills 0.210% due 01/05/17 [Member] | ProShares Ultra Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]		0.21%
Debt instrument, maturity date	[1],[3]		Jan. 5, 2017
U.S. Treasury Bills 0.390% due 02/16/17 [Member] | ProShares Ultra Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.39%
Debt instrument, maturity date	[1]		Feb. 16, 2017
U.S. Treasury Bills 0.390% due 02/16/17 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.39%
Debt instrument, maturity date	[1]		Feb. 16, 2017
U.S. Treasury Bills 0.390% due 02/16/17 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.39%
Debt instrument, maturity date	[1]		Feb. 16, 2017
U.S. Treasury Bills 0.390% due 02/16/17 [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.39%
Debt instrument, maturity date	[1]		Feb. 23, 2017
U.S. Treasury Bills 0.390% due 02/16/17 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.39%
Debt instrument, maturity date	[1]		Feb. 16, 2017
U.S. Treasury Bills 0.326% due 01/19/17 [Member] | ProShares UltraShort Australian Dollar [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.326%
Debt instrument, maturity date	[1]		Jan. 19, 2017
U.S. Treasury Bills 1.068% due 01/25/18 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	1.068%
Debt instrument, maturity date	[1],[2]	Jan. 25, 2018
U.S. Treasury Bills 1.068% due 01/25/18 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	1.068%
Debt instrument, maturity date	[1],[3]	Jan. 25, 2018
U.S. Treasury Bills 1.068% due 01/25/18 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	1.068%
Debt instrument, maturity date	[1],[3]	Jan. 25, 2018
U.S. Treasury Bills 1.264% due 03/01/18n [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[2]	1.264%
Debt instrument, maturity date	[1],[2]	Mar. 1, 2018
U.S. Treasury Bills 0.281% due 01/05/17 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]		0.281%
Debt instrument, maturity date	[1],[5]		Jan. 5, 2017
U.S. Treasury Bills 0.353% due 01/12/17 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]		0.353%
Debt instrument, maturity date	[1],[5]		Jan. 12, 2017
U.S. Treasury Bills 0.344% due 01/19/17 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]		0.344%
Debt instrument, maturity date	[1],[5]		Jan. 19, 2017
U.S. Treasury Bills 0.395% due 01/26/17 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]		0.395%
Debt instrument, maturity date	[1],[5]		Jan. 26, 2017
U.S. Treasury Bills 0.406% due 02/02/17 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.406%
Debt instrument, maturity date	[1]		Feb. 2, 2017
U.S. Treasury Bills 0.406% due 02/02/17 [Member] | ProShares UltraShort Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.406%
Debt instrument, maturity date	[1]		Feb. 2, 2017
U.S. Treasury Bills 0.441% due 02/09/17 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]		0.441%
Debt instrument, maturity date	[1],[5]		Feb. 9, 2017
U.S. Treasury Bills 0.458% due 03/02/17 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]		0.458%
Debt instrument, maturity date	[1],[5]		Mar. 2, 2017
U.S. Treasury Bills 0.516% due 03/30/17 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[5]		0.516%
Debt instrument, maturity date	[1],[5]		Mar. 30, 2017
U.S. Treasury Bills 0.343% due 01/26/17 [Member] | ProShares UltraShort Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.343%
Debt instrument, maturity date	[1]		Jan. 26, 2017
U.S. Treasury Bills 1.081% due 01/18/18 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	1.081%
Debt instrument, maturity date	[1],[3]	Jan. 18, 2018
U.S. Treasury Bills 0.286% due 01/05/17 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]		0.286%
Debt instrument, maturity date	[1],[3]		Jan. 5, 2017
U.S. Treasury Bills 0.286% due 01/05/17 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]		0.286%
Debt instrument, maturity date	[1],[3]		Jan. 5, 2017
U.S. Treasury Bills 0.421% due 01/12/17 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]		0.421%
Debt instrument, maturity date	[1],[3]		Jan. 12, 2017
U.S. Treasury Bills 0.342% due 01/19/17 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.342%
Debt instrument, maturity date	[1]		Jan. 19, 2017
U.S. Treasury Bills 0.350% due 01/26/17 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]		0.35%
Debt instrument, maturity date	[1],[3]		Jan. 26, 2017
U.S. Treasury Bills 0.391% due 02/02/17 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]		0.391%
Debt instrument, maturity date	[1],[3]		Feb. 2, 2017
U.S. Treasury Bills 0.471% due 02/09/17 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.471%
Debt instrument, maturity date	[1]		Feb. 9, 2017
U.S. Treasury Bills 0.308% due 01/19/17 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]		0.308%
Debt instrument, maturity date	[1],[6]		Jan. 19, 2017
U.S. Treasury Bills 0.407% due 02/02/17 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.407%
Debt instrument, maturity date	[1]		Feb. 2, 2017
U.S. Treasury Bills 0.406% due 02/16/17 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]		0.406%
Debt instrument, maturity date	[1],[6]		Feb. 16, 2017
U.S. Treasury Bills 0.481% due 03/09/17 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]		0.481%
Debt instrument, maturity date	[1],[6]		Mar. 9, 2017
U.S. Treasury Bills 0.339% due 01/12/17 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]		0.339%
Debt instrument, maturity date	[1],[6]		Jan. 12, 2017
U.S. Treasury Bills 0.455% due 01/19/17 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.455%
Debt instrument, maturity date	[1]		Jan. 19, 2017
U.S. Treasury Bills 0.409% due 02/02/17 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.409%
Debt instrument, maturity date	[1]		Feb. 2, 2017
U.S. Treasury Bills 0.409% due 02/02/17 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]		0.409%
Debt instrument, maturity date	[1],[7]		Feb. 2, 2017
U.S. Treasury Bills 0.452% due 02/09/17 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[6]		0.452%
Debt instrument, maturity date	[1],[6]		Feb. 9, 2017
U.S. Treasury Bills 0.452% due 02/09/17 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]		0.452%
Debt instrument, maturity date	[1],[3]		Feb. 9, 2017
U.S. Treasury Bills 1.083% due 02/08/18 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]	1.083%
Debt instrument, maturity date	[1],[3]	Feb. 8, 2018
U.S. Treasury Bills 0.343% due 01/12/17 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]		0.343%
Debt instrument, maturity date	[1],[3]		Jan. 12, 2017
U.S. Treasury Bills 0.405% due 01/19/17 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]		0.405%
Debt instrument, maturity date	[1],[3]		Jan. 19, 2017
U.S. Treasury Bills 0.346% due 01/26/17 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]		0.346%
Debt instrument, maturity date	[1],[3]		Jan. 17, 2017
U.S. Treasury Bills 0.390% due 02/02/17 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[3]		0.39%
Debt instrument, maturity date	[1],[3]		Feb. 2, 2017
U.S. Treasury Bills 0.281% due 01/05/17 [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.281%
Debt instrument, maturity date	[1]		Jan. 5, 2017
U.S. Treasury Bills 0.390% due 01/12/17 [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.39%
Debt instrument, maturity date	[1]		Jan. 12, 2017
U.S. Treasury Bills 0.411% due 02/02/17 [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1]		0.411%
Debt instrument, maturity date	[1]		Feb. 2, 2017
U.S. Treasury Bills 0.372% due 02/09/17 [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]		0.372%
Debt instrument, maturity date	[1],[7]		Feb. 9, 2017
U.S. Treasury Bills 0.382% due 01/12/17 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]		0.382%
Debt instrument, maturity date	[1],[7]		Jan. 12, 2017
U.S. Treasury Bills 0.330% due 01/19/17 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]		0.33%
Debt instrument, maturity date	[1],[7]		Jan. 19, 2017
U.S. Treasury Bills 0.353% due 01/26/17 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]		0.353%
Debt instrument, maturity date	[1],[7]		Jan. 26, 2017
U.S. Treasury Bills 0.425% due 02/09/17 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	[1],[7]		0.425%
Debt instrument, maturity date	[1],[7]		Feb. 9, 2017
[1]	Rates shown represents discount rate at the time of purchase.
[2]	All or partial amount pledged as collateral for swap agreements.
[3]	All or partial amount pledged as collateral for foreign currency forward contracts.
[4]	All or partial amount pledged as collateral for forward agreements.
[5]	All or partial amount pledged as collateral for swap agreements and/or futures contracts.
[6]	All or partial amount pledged as collateral for forward agreements and/or futures contracts.
[7]	All or partial amount pledged as collateral for futures contracts.

Schedule of Investments - Futur

Schedule of Investments - Futures Contracts Sold (Detail)		12 Months Ended
		Dec. 31, 2017USD ($)Contract		Dec. 31, 2016USD ($)Contract
ProShares Short Euro [Member] | Futures Contracts Sold [Member] | Euro Fx Currency Futures - CME, Expires March 2018 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract		53		120	[1]
Notional Amount at Value		$ 8,000,019		$ 15,861,000	[1]
Unrealized Appreciation (Depreciation)		(166,288)		132,900	[1]
ProShares Short VIX Short-Term Futures ETF [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)		$ 17,041,449		$ (10,309,611)	[2]
ProShares Short VIX Short-Term Futures ETF [Member] | Futures Contracts Sold [Member] | VIX Futures - CBOE, Expires January 2018 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract		38,015
Notional Amount at Value		$ 436,222,125
Unrealized Appreciation (Depreciation)		$ 21,493,549
ProShares Short VIX Short-Term Futures ETF [Member] | Futures Contracts Sold [Member] | VIX Futures - CBOE,Expires February 2018 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract		26,693
Notional Amount at Value		$ 332,995,175
Unrealized Appreciation (Depreciation)		(4,452,100)
ProShares Short VIX Short-Term Futures ETF [Member] | Futures Contracts Sold [Member] | VIX Futures - CBOE, expires October 2017 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract	[2]			8,491
Notional Amount at Value	[2]			$ 128,426,375
Unrealized Appreciation (Depreciation)	[2]			$ (7,027,685)
ProShares Short VIX Short-Term Futures ETF [Member] | Futures Contracts Sold [Member] | VIX Futures - CBOE, expires November 2017 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract	[2]			5,974
Notional Amount at Value	[2]			$ 99,019,050
Unrealized Appreciation (Depreciation)	[2]			(3,281,926)
ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)		$ (1,488,259)	[3]	$ 3,033,566	[4]
ProShares UltraShort Gold [Member] | Futures Contracts Sold [Member] | Gold Futures - COMEX, Expires February 2017 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract	[5]			2
Notional Amount at Value	[5]			$ 230,340
Unrealized Appreciation (Depreciation)	[5]			$ 18,980
ProShares UltraShort Gold [Member] | Futures Contracts Sold [Member] | Gold Futures - COMEX, expires February 2018 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract		2
Notional Amount at Value		$ 261,860
Unrealized Appreciation (Depreciation)		$ (5,460)
Pro Shares UltraPro 3X Short Crude Oil ETF [Member] | Futures Contracts Sold [Member] | WTI Crude Oil-NYMEX, Expires March 2018 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract		1,050
Notional Amount at Value		$ 63,462,000
Unrealized Appreciation (Depreciation)		$ (2,988,155)
ProShares UltraShort Australian Dollar [Member] | Futures Contracts Sold [Member] | Australian Dollar Fx Currency Futures CME expires March 2018 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract		353
Notional Amount at Value		$ 27,572,830
Unrealized Appreciation (Depreciation)		(893,220)
ProShares UltraShort Australian Dollar [Member] | Futures Contracts Sold [Member] | Australian Dollar Fx Currency Futures - CME, Expires March 2017 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract	[6]			462
Notional Amount at Value	[6]			$ 33,273,240
Unrealized Appreciation (Depreciation)	[6]			1,182,340
ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)		$ (30,607,142)	[3]	$ (12,206,881)	[4]
ProShares UltraShort Bloomberg Crude Oil [Member] | Futures Contracts Sold [Member] | WTI Crude Oil-NYMEX, Expires March 2018 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract		1,125
Notional Amount at Value		$ 67,995,000
Unrealized Appreciation (Depreciation)		$ (3,962,648)
ProShares UltraShort Bloomberg Crude Oil [Member] | Futures Contracts Sold [Member] | WTI Crude Oil - NYMEX, Expires March 2017 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract	[7]			1,401
Notional Amount at Value	[7]			$ 76,578,660
Unrealized Appreciation (Depreciation)	[7]			$ (1,426,815)
ProShares UltraShort Bloomberg Natural Gas [Member] | Futures Contracts Sold [Member] | Natural Gas-NYMEX, expires March 2018 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract		475
Notional Amount at Value		$ 13,803,500
Unrealized Appreciation (Depreciation)		(1,097,049)
ProShares UltraShort Bloomberg Natural Gas [Member] | Futures Contracts Sold [Member] | Natural Gas - NYMEX, Expires March 2017 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract	[8]			219
Notional Amount at Value	[8]			$ 8,067,960
Unrealized Appreciation (Depreciation)	[8]			(482,031)
ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)		$ (1,716,163)	[3]	$ 1,384,246	[4]
ProShares UltraShort Silver [Member] | Futures Contracts Sold [Member] | Silver Futures - COMEX, expires March 2018 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract		2
Notional Amount at Value		$ (171,450)
Unrealized Appreciation (Depreciation)		$ (1,650)
ProShares UltraShort Silver [Member] | Futures Contracts Sold [Member] | Silver Futures - COMEX, Expires March 2017 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract	[9]			2
Notional Amount at Value	[9]			$ 159,890
Unrealized Appreciation (Depreciation)	[9]			$ 27,310
[1]	Cash collateral in the amount of $402,600 was pledged to cover margin requirements for open futures contracts as of December 31, 2016.
[2]	Cash collateral in the amount of $55,323,984 was pledged to cover margin requirements for open futures contracts as of December 31, 2016.
[3]	The positions and counterparties herein are as of December 31, 2017. The Funds continually evaluate different counterparties for their transactions and counterparties are subject to change. New counterparties can be added at any time.
[4]	The positions and counterparties herein are as of December 31, 2016. The Funds continually evaluate different counterparties for their transactions and counterparties are subject to change. New counterparties can be added at any time.
[5]	Cash collateral in the amount of $13,200 was pledged to cover margin requirements for open futures contracts as of December 31, 2016.
[6]	Cash collateral in the amount of $914,760 was pledged to cover margin requirements for open futures contracts as of December 31, 2016.
[7]	Cash collateral in the amount of $4,931,520 was pledged to cover margin requirements for open futures contracts as of December 31, 2016.
[8]	Cash collateral in the amount of $710,655 was pledged to cover margin requirements for open futures contracts as of December 31, 2016.
[9]	Cash collateral in the amount of $14,300 was pledged to cover margin requirements for open futures contracts as of December 31, 2016.

Schedule of Investments - Fut26

Schedule of Investments - Futures Contracts Sold (Parenthetical) (Detail) - Futures Contracts Sold [Member]	12 Months Ended
	Dec. 31, 2016USD ($)
ProShares Short Euro [Member]
Schedule of Investments [Line Items]
Cash collateral pledged to cover margin requirements	$ 402,600
ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Cash collateral pledged to cover margin requirements	55,323,984
ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Cash collateral pledged to cover margin requirements	13,200
ProShares UltraShort Australian Dollar [Member]
Schedule of Investments [Line Items]
Cash collateral pledged to cover margin requirements	914,760
ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Cash collateral pledged to cover margin requirements	4,931,520
ProShares UltraShort Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Cash collateral pledged to cover margin requirements	710,655
ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Cash collateral pledged to cover margin requirements	$ 14,300

Schedule of Investments - Fut27

Schedule of Investments - Futures Contracts Purchased (Detail)		12 Months Ended
		Dec. 31, 2017USD ($)Contract		Dec. 31, 2016USD ($)Contract
ProShares Ultra VIX Short-Term Futures ETF [Member] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)		$ (34,466,120)		$ (7,972,237)	[1]
ProShares Ultra VIX Short-Term Futures ETF [Member] | Futures Contracts Purchased [Member] | VIX Futures - CBOE, Expires January 2017 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract	[1]			38,688
Notional Amount at Value	[1]			$ 585,156,000
Unrealized Appreciation (Depreciation)	[1]			$ (21,567,112)
ProShares Ultra VIX Short-Term Futures ETF [Member] | Futures Contracts Purchased [Member] | VIX Futures - CBOE, Expires February 2017 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract	[1]			27,012
Notional Amount at Value	[1]			$ 447,723,900
Unrealized Appreciation (Depreciation)	[1]			13,594,875
ProShares Ultra VIX Short-Term Futures ETF [Member] | Futures Contracts Purchased [Member] | VIX Futures - CBOE, Expires January 2018 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract		39,057
Notional Amount at Value		$ 448,179,075
Unrealized Appreciation (Depreciation)		$ (38,440,762)
ProShares Ultra VIX Short-Term Futures ETF [Member] | Futures Contracts Purchased [Member] | VIX Futures - CBOE,Expires February 2018 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract		27,298
Notional Amount at Value		$ 340,542,550
Unrealized Appreciation (Depreciation)		3,974,642
ProShares VIX Mid-Term Futures ETF [Member] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)		$ (2,215,280)		$ (1,288,245)	[2]
ProShares VIX Mid-Term Futures ETF [Member] | Futures Contracts Purchased [Member] | VIX Futures - CBOE, expires April 2018 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract		354
Notional Amount at Value		$ 4,911,750
Unrealized Appreciation (Depreciation)		$ (617,555)
ProShares VIX Mid-Term Futures ETF [Member] | Futures Contracts Purchased [Member] | VIX Futures - CBOE, Expires May 2018 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract		603
Notional Amount at Value		$ 8,668,125
Unrealized Appreciation (Depreciation)		$ (910,645)
ProShares VIX Mid-Term Futures ETF [Member] | Futures Contracts Purchased [Member] | VIX Futures - CBOE, Expires June 2018 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract		603
Notional Amount at Value		$ 8,939,475
Unrealized Appreciation (Depreciation)		$ (641,030)
ProShares VIX Mid-Term Futures ETF [Member] | Futures Contracts Purchased [Member] | VIX Futures - CBOE, Expires July 2018 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract		248
Notional Amount at Value		$ 3,825,400
Unrealized Appreciation (Depreciation)		(46,050)
ProShares VIX Mid-Term Futures ETF [Member] | Futures Contracts Purchased [Member] | VIX Futures - CBOE, Expires April 2017 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract	[2]			474
Notional Amount at Value	[2]			$ 8,733,450
Unrealized Appreciation (Depreciation)	[2]			$ (655,635)
ProShares VIX Mid-Term Futures ETF [Member] | Futures Contracts Purchased [Member] | VIX Futures - CBOE, Expires May 2017 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract	[2]			806
Notional Amount at Value	[2]			$ 15,172,950
Unrealized Appreciation (Depreciation)	[2]			$ (628,070)
ProShares VIX Mid-Term Futures ETF [Member] | Futures Contracts Purchased [Member] | VIX Futures - CBOE, Expires June 2017 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract	[2]			807
Notional Amount at Value	[2]			$ 15,393,525
Unrealized Appreciation (Depreciation)	[2]			$ (72,915)
ProShares VIX Mid-Term Futures ETF [Member] | Futures Contracts Purchased [Member] | VIX Futures - CBOE, Expires July 2017 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract	[2]			332
Notional Amount at Value	[2]			$ 6,523,800
Unrealized Appreciation (Depreciation)	[2]			68,375
ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)		$ 62,238,361	[3]	$ 55,358,571	[4]
ProShares Ultra Bloomberg Crude Oil [Member] | Futures Contracts Purchased [Member] | WTI Crude Oil-NYMEX, Expires March 2018 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract		3,854
Notional Amount at Value		$ 232,935,760
Unrealized Appreciation (Depreciation)		$ 11,945,979
ProShares Ultra Bloomberg Crude Oil [Member] | Futures Contracts Purchased [Member] | WTI Crude Oil - NYMEX, Expires March 2017 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract	[5]			5,855
Notional Amount at Value	[5]			$ 320,034,300
Unrealized Appreciation (Depreciation)	[5]			$ 5,537,165
ProShares Ultra Bloomberg Natural Gas [Member] | Futures Contracts Purchased [Member] | Natural Gas-NYMEX, expires March 2018 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract		4,355
Notional Amount at Value		$ 126,556,300
Unrealized Appreciation (Depreciation)		7,225,810
ProShares Ultra Bloomberg Natural Gas [Member] | Futures Contracts Purchased [Member] | Natural Gas - NYMEX, expires November 2017 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract	[6]			2,346
Notional Amount at Value	[6]			$ 86,426,640
Unrealized Appreciation (Depreciation)	[6]			2,536,720
ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)		$ 3,646,355	[3]	(4,431,107)	[4]
ProShares Ultra Gold [Member] | Futures Contracts Purchased [Member] | Gold Futures - COMEX, expires February 2018 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract		2
Notional Amount at Value		$ 261,860
Unrealized Appreciation (Depreciation)		$ 5,480
ProShares Ultra Gold [Member] | Futures Contracts Purchased [Member] | Gold Futures - COMEX, Expires February 2017 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract	[7]	2
Notional Amount at Value	[7]	$ 230,340
Unrealized Appreciation (Depreciation)	[7]	(18,960)
ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)		$ 21,735,334	[3]	$ (20,976,189)	[4]
ProShares Ultra Silver [Member] | Futures Contracts Purchased [Member] | Silver Futures - COMEX, expires March 2018 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract		2
Notional Amount at Value		$ 171,450
Unrealized Appreciation (Depreciation)		$ 1,600
ProShares Ultra Silver [Member] | Futures Contracts Purchased [Member] | Silver Futures - COMEX, Expires March 2017 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract	[8]			2
Notional Amount at Value	[8]			$ 159,890
Unrealized Appreciation (Depreciation)	[8]			(27,360)
ProShares UltraPro 3x Crude Oil ETF [Member] | Futures Contracts Purchased [Member] | WTI Crude Oil - NYMEX, expires November 2017 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract		563
Notional Amount at Value		$ 34,027,720
Unrealized Appreciation (Depreciation)		1,417,998
ProShares VIX Short-Term Futures ETF [Member] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)		$ (4,761,877)		$ (468,652)	[9]
ProShares VIX Short-Term Futures ETF [Member] | Futures Contracts Purchased [Member] | VIX Futures - CBOE, Expires January 2017 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract	[9]			6,549
Notional Amount at Value	[9]			$ 99,053,625
Unrealized Appreciation (Depreciation)	[9]			$ (2,742,526)
ProShares VIX Short-Term Futures ETF [Member] | Futures Contracts Purchased [Member] | VIX Futures - CBOE, Expires February 2017 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract	[9]			4,560
Notional Amount at Value	[9]			$ 75,582,000
Unrealized Appreciation (Depreciation)	[9]			$ 2,273,874
ProShares VIX Short-Term Futures ETF [Member] | Futures Contracts Purchased [Member] | VIX Futures - CBOE, Expires January 2018 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract		6,836
Notional Amount at Value		$ 78,443,100
Unrealized Appreciation (Depreciation)		$ (5,471,585)
ProShares VIX Short-Term Futures ETF [Member] | Futures Contracts Purchased [Member] | VIX Futures - CBOE,Expires February 2018 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract		4,770
Notional Amount at Value		$ 59,505,750
Unrealized Appreciation (Depreciation)		$ 709,708
[1]	Cash collateral in the amount of $71,363,625 was pledged to cover margin requirements for open futures contracts as of December 31, 2016.
[2]	Cash collateral in the amount of $1,052,615 was pledged to cover margin requirements for open futures contracts as of December 31, 2016.
[3]	The positions and counterparties herein are as of December 31, 2017. The Funds continually evaluate different counterparties for their transactions and counterparties are subject to change. New counterparties can be added at any time.
[4]	The positions and counterparties herein are as of December 31, 2016. The Funds continually evaluate different counterparties for their transactions and counterparties are subject to change. New counterparties can be added at any time.
[5]	Cash collateral in the amount of $20,609,600 was pledged to cover margin requirements for open futures contracts as of December 31, 2016.
[6]	Cash collateral in the amount of $7,612,770 was pledged to cover margin requirements for open futures contracts as of December 31, 2016.
[7]	Cash collateral in the amount of $13,200 was pledged to cover margin requirements for open futures contracts as of December 31, 2016.
[8]	Cash collateral in the amount of $14,300 was pledged to cover margin requirements for open futures contracts as of December 31, 2016.
[9]	Cash collateral in the amount of $17,235,855 was pledged to cover margin requirements for open futures contracts as of December 31, 2016.

Schedule of Investments - Total

Schedule of Investments - Total Return Swap Agreements (Detail) - USD ($)		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016
ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)		$ (30,607,142)	[1]	$ (12,206,881)	[2]
ProShares UltraShort Bloomberg Crude Oil [Member] | Swap Agreement with Citibank N.A. Based on Bloomberg WTI Crude Oil Subindex [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[2],[3]			0.18%
Termination Date	[2]			Jan. 10, 2017
Notional Amount at Value	[2],[4]			$ (116,603,958)
Unrealized Appreciation (Depreciation)	[2]			$ (4,742,191)
ProShares UltraShort Bloomberg Crude Oil [Member] | Swap Agreement with Goldman Sachs International Based on Bloomberg Crude Oil Sub-Index [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[2],[3]			0.25%
Termination Date	[2]			Jan. 10, 2017
Notional Amount at Value	[2],[4]			$ (87,898,388)
Unrealized Appreciation (Depreciation)	[2]			$ (3,061,395)
ProShares UltraShort Bloomberg Crude Oil [Member] | Swap Agreement with Societe Generale S.A. Based on Bloomberg WTI Crude Oil Subindex [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[2],[3]			0.25%
Termination Date	[2]			Jan. 10, 2017
Notional Amount at Value	[2],[4]			$ (31,195,025)
Unrealized Appreciation (Depreciation)	[2]			$ (1,050,699)
ProShares UltraShort Bloomberg Crude Oil [Member] | Swap Agreement with UBS AG Based on Bloomberg WTI Crude Oil Subindex [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[2],[3]			0.25%
Termination Date	[2]			Jan. 10, 2017
Notional Amount at Value	[2],[4]			$ (89,698,517)
Unrealized Appreciation (Depreciation)	[2]			(3,352,596)
ProShares UltraShort Bloomberg Crude Oil [Member] | Swap Agreement with Citibank, N.A. based on Bloomberg Crude Oil Sub-Index [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[1],[5]	0.18%
Termination Date	[1]	Jan. 8, 2018
Notional Amount at Value	[1],[4]	$ (135,972,863)
Unrealized Appreciation (Depreciation)	[1]	$ (10,173,164)
ProShares UltraShort Bloomberg Crude Oil [Member] | Swap Agreement with Goldman Sachs International based on Bloomberg Crude Oil Sub-Index [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[1],[5]	0.25%
Termination Date	[1]	Jan. 8, 2018
Notional Amount at Value	[1],[4]	$ (105,656,763)
Unrealized Appreciation (Depreciation)	[1]	$ (9,242,398)
ProShares UltraShort Bloomberg Crude Oil [Member] | Swap Agreement with Societe Generale based on Bloomberg Crude Oil Sub-Index [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[1],[5]	0.25%
Termination Date	[1]	Jan. 8, 2018
Notional Amount at Value	[1],[4]	$ (25,759,601)
Unrealized Appreciation (Depreciation)	[1]	$ (1,904,113)
ProShares UltraShort Bloomberg Crude Oil [Member] | Swap Agreement with UBS AG based on Bloomberg Crude Oil Sub-Index [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[1],[5]	0.25%
Termination Date	[1]	Jan. 8, 2018
Notional Amount at Value	[1],[4]	$ (116,263,837)
Unrealized Appreciation (Depreciation)	[1]	(9,287,467)
ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)		$ 62,238,361	[1]	$ 55,358,571	[2]
ProShares Ultra Bloomberg Crude Oil [Member] | Swap Agreement with Citibank N.A. Based on Bloomberg WTI Crude Oil Subindex [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[2],[6]			0.18%
Termination Date	[2]			Jan. 10, 2017
Notional Amount at Value	[2],[4]			$ 545,083,669
Unrealized Appreciation (Depreciation)	[2]			$ 18,427,009
ProShares Ultra Bloomberg Crude Oil [Member] | Swap Agreement with Goldman Sachs International Based on Bloomberg Crude Oil Sub-Index [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[2],[6]			0.25%
Termination Date	[2]			Jan. 10, 2017
Notional Amount at Value	[2],[4]			$ 379,451,639
Unrealized Appreciation (Depreciation)	[2]			$ 14,016,906
ProShares Ultra Bloomberg Crude Oil [Member] | Swap Agreement with Societe Generale S.A. Based on Bloomberg WTI Crude Oil Subindex [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[2],[6]			0.25%
Termination Date	[2]			Jan. 10, 2017
Notional Amount at Value	[2],[4]			$ 259,616,766
Unrealized Appreciation (Depreciation)	[2]			$ 8,661,821
ProShares Ultra Bloomberg Crude Oil [Member] | Swap Agreement with UBS AG Based on Bloomberg WTI Crude Oil Subindex [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[2],[6]			0.25%
Termination Date	[2]			Jan. 10, 2017
Notional Amount at Value	[2],[4]			$ 363,331,028
Unrealized Appreciation (Depreciation)	[2]			$ 14,252,835
ProShares Ultra Bloomberg Crude Oil [Member] | Swap Agreement with Citibank, N.A. based on Bloomberg Crude Oil Sub-Index [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[1],[5]	0.18%
Termination Date	[1]	Jan. 8, 2018
Notional Amount at Value	[1],[4]	$ 268,156,276
Unrealized Appreciation (Depreciation)	[1]	$ 19,815,892
ProShares Ultra Bloomberg Crude Oil [Member] | Swap Agreement with Goldman Sachs International based on Bloomberg Crude Oil Sub-Index [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[1],[5]	0.25%
Termination Date	[1]	Jan. 8, 2018
Notional Amount at Value	[1],[4]	$ 213,961,079
Unrealized Appreciation (Depreciation)	[1]	$ 16,654,031
ProShares Ultra Bloomberg Crude Oil [Member] | Swap Agreement with Societe Generale based on Bloomberg Crude Oil Sub-Index [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[1],[5]	0.25%
Termination Date	[1]	Jan. 8, 2018
Notional Amount at Value	[1],[4]	$ 122,285,969
Unrealized Appreciation (Depreciation)	[1]	$ 9,003,519
ProShares Ultra Bloomberg Crude Oil [Member] | Swap Agreement with UBS AG based on Bloomberg Crude Oil Sub-Index [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[1],[5]	0.25%
Termination Date	[1]	Jan. 8, 2018
Notional Amount at Value	[1],[4]	$ 211,563,368
Unrealized Appreciation (Depreciation)	[1]	$ 16,764,919
[1]	The positions and counterparties herein are as of December 31, 2017. The Funds continually evaluate different counterparties for their transactions and counterparties are subject to change. New counterparties can be added at any time.
[2]	The positions and counterparties herein are as of December 31, 2016. The Funds continually evaluate different counterparties for their transactions and counterparties are subject to change. New counterparties can be added at any time.
[3]	Reflects the floating financing rate, as of December 31, 2016 on the notional amount of the swap agreement paid to the counterparty or received from the counterparty, excluding any commissions.
[4]	For swap agreements, a positive amount represents "long" exposure to the benchmark index. A negative amount represents "short" exposure to the benchmark index.
[5]	Reflects the floating financing rate, as of December 31, 2017, on the notional amount of the swap agreement paid to the counterparty or received from the counterparty, excluding any commissions. Total Return Swap Agreements payment is due at termination/maturity.
[6]	Reflects the floating financing rate, as of December 31, 2016, on the notional amount of the swap agreement paid to the counterparty or received from the counterparty, excluding any commissions.

Schedule of Investments - Fut29

Schedule of Investments - Futures Contracts Purchased (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2016USD ($)
Futures Contracts Purchased [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Cash collateral pledged to cover margin requirements	$ 71,363,625
Futures Contracts Purchased [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Cash collateral pledged to cover margin requirements	1,052,615
Futures Contracts Purchased [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Cash collateral pledged to cover margin requirements	20,609,600
Futures Contracts Purchased [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Cash collateral pledged to cover margin requirements	7,612,770
Futures Contracts Purchased [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Cash collateral pledged to cover margin requirements	14,300
Futures Contracts Purchased [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Cash collateral pledged to cover margin requirements	17,235,855
Futures Contracts Sold [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Cash collateral pledged to cover margin requirements	$ 13,200

Schedule of Investments - Forei

Schedule of Investments - Foreign Currency Forward Contracts (Detail)		12 Months Ended
		Dec. 31, 2017USD ($)		Dec. 31, 2016USD ($)		Dec. 31, 2017JPY (¥)	Dec. 31, 2017EUR (€)	Dec. 31, 2016JPY (¥)	Dec. 31, 2016EUR (€)
ProShares Ultra Euro [Member] | Contracts to Purchase [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)		$ 321,609	[1]	$ (573,401)	[2]
ProShares Ultra Euro [Member] | Contracts to Purchase [Member] | Euro with Goldman Sachs International [Member]
Schedule of Investments [Line Items]
Settlement Date		Jan. 12, 2018	[1]	Jan. 13, 2017	[2]
Contract Amount/ Notional Amount	[2]			$ 10,368,169					€ 9,841,725
Unrealized Appreciation (Depreciation)		$ 159,093	[1]	$ (236,099)	[2]
ProShares Ultra Euro [Member] | Contracts to Purchase [Member] | Euro with Goldman Sachs International [Member] | Contract Amount in Local Currency for Other than USD Values [Member]
Schedule of Investments [Line Items]
Contract Amount/ Notional Amount | €	[1]						€ 8,921,525
ProShares Ultra Euro [Member] | Contracts to Purchase [Member] | Euro with Goldman Sachs International [Member] | Contract Amount in US Dollars for USD Values [Member]
Schedule of Investments [Line Items]
Contract Amount/ Notional Amount	[1]	$ 10,550,545
ProShares Ultra Euro [Member] | Contracts to Purchase [Member] | Euro with UBS AG [Member]
Schedule of Investments [Line Items]
Settlement Date		Jan. 12, 2018	[1]	Jan. 13, 2017	[2]
Contract Amount/ Notional Amount	[2]			$ 14,511,417					13,774,600
Unrealized Appreciation (Depreciation)		$ 162,516	[1]	(337,302)	[2]
ProShares Ultra Euro [Member] | Contracts to Purchase [Member] | Euro with UBS AG [Member] | Contract Amount in Local Currency for Other than USD Values [Member]
Schedule of Investments [Line Items]
Contract Amount/ Notional Amount | €	[1]						10,174,300
ProShares Ultra Euro [Member] | Contracts to Purchase [Member] | Euro with UBS AG [Member] | Contract Amount in US Dollars for USD Values [Member]
Schedule of Investments [Line Items]
Contract Amount/ Notional Amount	[1]	12,050,988
ProShares Ultra Euro [Member] | Contracts to Sell [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)		$ (57,457)	[1]	$ (609)	[2]
ProShares Ultra Euro [Member] | Contracts to Sell [Member] | Euro with Goldman Sachs International [Member]
Schedule of Investments [Line Items]
Settlement Date		Jan. 12, 2018	[1]	Jan. 13, 2017	[2]
Contract Amount/ Notional Amount	[2]			$ (756,196)					(717,800)
Unrealized Appreciation (Depreciation)		$ (56,669)	[1]	$ (3,157)	[2]
ProShares Ultra Euro [Member] | Contracts to Sell [Member] | Euro with Goldman Sachs International [Member] | Contract Amount in Local Currency for Other than USD Values [Member]
Schedule of Investments [Line Items]
Contract Amount/ Notional Amount | €	[1]						(3,071,600)
ProShares Ultra Euro [Member] | Contracts to Sell [Member] | Euro with Goldman Sachs International [Member] | Contract Amount in US Dollars for USD Values [Member]
Schedule of Investments [Line Items]
Contract Amount/ Notional Amount	[1]	$ (3,630,563)
ProShares Ultra Euro [Member] | Contracts to Sell [Member] | Euro with UBS AG [Member]
Schedule of Investments [Line Items]
Settlement Date		Jan. 12, 2018	[1]	Jan. 13, 2017	[2]
Contract Amount/ Notional Amount	[2]			$ (278,121)					(264,000)
Unrealized Appreciation (Depreciation)		$ (788)	[1]	2,548	[2]
ProShares Ultra Euro [Member] | Contracts to Sell [Member] | Euro with UBS AG [Member] | Contract Amount in Local Currency for Other than USD Values [Member]
Schedule of Investments [Line Items]
Contract Amount/ Notional Amount | €	[1]						(37,900)
ProShares Ultra Euro [Member] | Contracts to Sell [Member] | Euro with UBS AG [Member] | Contract Amount in US Dollars for USD Values [Member]
Schedule of Investments [Line Items]
Contract Amount/ Notional Amount	[1]	(44,709)
ProShares UltraShort Euro [Member] | Contracts to Purchase [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)		$ 449,302	[1]	$ (60,534)	[2]
ProShares UltraShort Euro [Member] | Contracts to Purchase [Member] | Euro with Goldman Sachs International [Member]
Schedule of Investments [Line Items]
Settlement Date		Jan. 12, 2018	[1]	Jan. 13, 2017	[2]
Contract Amount/ Notional Amount	[2]			$ 69,424,004					65,899,000
Unrealized Appreciation (Depreciation)		$ 158,796	[1]	$ 295,605	[2]
ProShares UltraShort Euro [Member] | Contracts to Purchase [Member] | Euro with Goldman Sachs International [Member] | Contract Amount in Local Currency for Other than USD Values [Member]
Schedule of Investments [Line Items]
Contract Amount/ Notional Amount | €	[1]						15,379,400
ProShares UltraShort Euro [Member] | Contracts to Purchase [Member] | Euro with Goldman Sachs International [Member] | Contract Amount in US Dollars for USD Values [Member]
Schedule of Investments [Line Items]
Contract Amount/ Notional Amount	[1]	$ 18,303,048
ProShares UltraShort Euro [Member] | Contracts to Purchase [Member] | Euro with UBS AG [Member]
Schedule of Investments [Line Items]
Settlement Date		Jan. 12, 2018	[1]	Jan. 13, 2017	[2]
Contract Amount/ Notional Amount	[2]			$ 23,557,639					22,361,500
Unrealized Appreciation (Depreciation)		$ 290,506	[1]	(356,139)	[2]
ProShares UltraShort Euro [Member] | Contracts to Purchase [Member] | Euro with UBS AG [Member] | Contract Amount in Local Currency for Other than USD Values [Member]
Schedule of Investments [Line Items]
Contract Amount/ Notional Amount | €	[1]						24,804,600
ProShares UltraShort Euro [Member] | Contracts to Purchase [Member] | Euro with UBS AG [Member] | Contract Amount in US Dollars for USD Values [Member]
Schedule of Investments [Line Items]
Contract Amount/ Notional Amount	[1]	29,485,603
ProShares UltraShort Euro [Member] | Contracts to Sell [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)		$ (6,793,571)		$ 16,223,465
ProShares UltraShort Euro [Member] | Contracts to Sell [Member] | Euro with Goldman Sachs International [Member]
Schedule of Investments [Line Items]
Settlement Date		Jan. 12, 2018		Jan. 13, 2017
Contract Amount/ Notional Amount				$ (414,315,600)					(393,278,725)
Unrealized Appreciation (Depreciation)		$ (3,456,408)		$ 7,813,462
ProShares UltraShort Euro [Member] | Contracts to Sell [Member] | Euro with Goldman Sachs International [Member] | Contract Amount in Local Currency for Other than USD Values [Member]
Schedule of Investments [Line Items]
Contract Amount/ Notional Amount | €							(191,822,225)
ProShares UltraShort Euro [Member] | Contracts to Sell [Member] | Euro with Goldman Sachs International [Member] | Contract Amount in US Dollars for USD Values [Member]
Schedule of Investments [Line Items]
Contract Amount/ Notional Amount		$ (226,812,145)
ProShares UltraShort Euro [Member] | Contracts to Sell [Member] | Euro with UBS AG [Member]
Schedule of Investments [Line Items]
Settlement Date		Jan. 12, 2018		Jan. 13, 2017
Contract Amount/ Notional Amount				$ (376,072,375)					€ (356,977,300)
Unrealized Appreciation (Depreciation)		$ (3,337,163)		8,410,003
ProShares UltraShort Euro [Member] | Contracts to Sell [Member] | Euro with UBS AG [Member] | Contract Amount in Local Currency for Other than USD Values [Member]
Schedule of Investments [Line Items]
Contract Amount/ Notional Amount | €							€ (185,510,600)
ProShares UltraShort Euro [Member] | Contracts to Sell [Member] | Euro with UBS AG [Member] | Contract Amount in US Dollars for USD Values [Member]
Schedule of Investments [Line Items]
Contract Amount/ Notional Amount		(219,354,746)
ProShares Ultra Yen [Member]
Schedule of Investments [Line Items]
Total Unrealized Depreciation	[1]	(34,824)
ProShares Ultra Yen [Member] | Contracts to Purchase [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)		$ (34,514)	[1]	$ (342,455)	[2]
ProShares Ultra Yen [Member] | Contracts to Purchase [Member] | Yen with Goldman Sachs International [Member]
Schedule of Investments [Line Items]
Settlement Date		Jan. 12, 2018	[1]	Jan. 13, 2017	[2]
Contract Amount/ Notional Amount	[2]			$ 7,572,024				¥ 884,408,200
Unrealized Appreciation (Depreciation)		$ (17,243)	[1]	$ (220,115)	[2]
ProShares Ultra Yen [Member] | Contracts to Purchase [Member] | Yen with Goldman Sachs International [Member] | Contract Amount in Local Currency for Other than USD Values [Member]
Schedule of Investments [Line Items]
Contract Amount/ Notional Amount | ¥	[1]					¥ 325,511,500
ProShares Ultra Yen [Member] | Contracts to Purchase [Member] | Yen with Goldman Sachs International [Member] | Contract Amount in US Dollars for USD Values [Member]
Schedule of Investments [Line Items]
Contract Amount/ Notional Amount	[1]	$ 2,907,183
ProShares Ultra Yen [Member] | Contracts to Purchase [Member] | Yen with UBS AG [Member]
Schedule of Investments [Line Items]
Settlement Date		Jan. 12, 2018	[1]	Jan. 13, 2017	[2]
Contract Amount/ Notional Amount	[2]			$ 4,025,524				470,179,000
Unrealized Appreciation (Depreciation)		$ (17,271)	[1]	(122,340)	[2]
ProShares Ultra Yen [Member] | Contracts to Purchase [Member] | Yen with UBS AG [Member] | Contract Amount in Local Currency for Other than USD Values [Member]
Schedule of Investments [Line Items]
Contract Amount/ Notional Amount | ¥	[1]					331,666,700
ProShares Ultra Yen [Member] | Contracts to Purchase [Member] | Yen with UBS AG [Member] | Contract Amount in US Dollars for USD Values [Member]
Schedule of Investments [Line Items]
Contract Amount/ Notional Amount	[1]	2,961,858
ProShares Ultra Yen [Member] | Contracts to Sell [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)		$ (310)	[1]	$ 379	[2]
ProShares Ultra Yen [Member] | Contracts to Sell [Member] | Yen with Goldman Sachs International [Member]
Schedule of Investments [Line Items]
Settlement Date		Jan. 12, 2018	[1]	Jan. 13, 2017	[2]
Contract Amount/ Notional Amount	[2]			$ (488,372)				(57,041,600)
Unrealized Appreciation (Depreciation)		$ (167)	[1]	379	[2]
ProShares Ultra Yen [Member] | Contracts to Sell [Member] | Yen with Goldman Sachs International [Member] | Contract Amount in Local Currency for Other than USD Values [Member]
Schedule of Investments [Line Items]
Contract Amount/ Notional Amount | ¥	[1]					(8,564,800)
ProShares Ultra Yen [Member] | Contracts to Sell [Member] | Yen with Goldman Sachs International [Member] | Contract Amount in US Dollars for USD Values [Member]
Schedule of Investments [Line Items]
Contract Amount/ Notional Amount	[1]	$ (75,872)
ProShares Ultra Yen [Member] | Contracts to Sell [Member] | Yen with UBS AG [Member]
Schedule of Investments [Line Items]
Settlement Date	[1]	Jan. 12, 2018
Unrealized Appreciation (Depreciation)	[1]	$ (143)
ProShares Ultra Yen [Member] | Contracts to Sell [Member] | Yen with UBS AG [Member] | Contract Amount in Local Currency for Other than USD Values [Member]
Schedule of Investments [Line Items]
Contract Amount/ Notional Amount | ¥	[1]					(3,336,100)
ProShares Ultra Yen [Member] | Contracts to Sell [Member] | Yen with UBS AG [Member] | Contract Amount in US Dollars for USD Values [Member]
Schedule of Investments [Line Items]
Contract Amount/ Notional Amount	[1]	(29,476)
ProShares UltraShort Yen [Member] | Contracts to Purchase [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)		$ (41,734)	[1]	$ 90,057	[2]
ProShares UltraShort Yen [Member] | Contracts to Purchase [Member] | Yen with Goldman Sachs International [Member]
Schedule of Investments [Line Items]
Settlement Date		Jan. 12, 2018	[1]	Jan. 13, 2017	[2]
Contract Amount/ Notional Amount	[2]			$ 80,581,067				9,411,824,400
Unrealized Appreciation (Depreciation)		$ (1,119)	[1]	$ 215,477	[2]
ProShares UltraShort Yen [Member] | Contracts to Purchase [Member] | Yen with Goldman Sachs International [Member] | Contract Amount in Local Currency for Other than USD Values [Member]
Schedule of Investments [Line Items]
Contract Amount/ Notional Amount | ¥	[1]					1,557,430,400
ProShares UltraShort Yen [Member] | Contracts to Purchase [Member] | Yen with Goldman Sachs International [Member] | Contract Amount in US Dollars for USD Values [Member]
Schedule of Investments [Line Items]
Contract Amount/ Notional Amount	[1]	$ 13,828,233
ProShares UltraShort Yen [Member] | Contracts to Purchase [Member] | Yen with UBS AG [Member]
Schedule of Investments [Line Items]
Settlement Date		Jan. 12, 2018	[1]	Jan. 13, 2017	[2]
Contract Amount/ Notional Amount	[2]			$ 5,783,703				675,533,300
Unrealized Appreciation (Depreciation)		$ (40,615)	[1]	(125,420)	[2]
ProShares UltraShort Yen [Member] | Contracts to Purchase [Member] | Yen with UBS AG [Member] | Contract Amount in Local Currency for Other than USD Values [Member]
Schedule of Investments [Line Items]
Contract Amount/ Notional Amount | ¥	[1]					2,779,401,900
ProShares UltraShort Yen [Member] | Contracts to Purchase [Member] | Yen with UBS AG [Member] | Contract Amount in US Dollars for USD Values [Member]
Schedule of Investments [Line Items]
Contract Amount/ Notional Amount	[1]	24,716,567
ProShares UltraShort Yen [Member] | Contracts to Sell [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)		$ 1,568,997	[1]	$ 16,654,880	[2]
ProShares UltraShort Yen [Member] | Contracts to Sell [Member] | Yen with Goldman Sachs International [Member]
Schedule of Investments [Line Items]
Settlement Date		Jan. 12, 2018	[1]	Jan. 13, 2017	[2]
Contract Amount/ Notional Amount	[2]			$ (354,548,372)				(41,411,055,600)
Unrealized Appreciation (Depreciation)		$ 822,436	[1]	$ 8,041,302	[2]
ProShares UltraShort Yen [Member] | Contracts to Sell [Member] | Yen with Goldman Sachs International [Member] | Contract Amount in Local Currency for Other than USD Values [Member]
Schedule of Investments [Line Items]
Contract Amount/ Notional Amount | ¥	[1]					(16,323,923,000)
ProShares UltraShort Yen [Member] | Contracts to Sell [Member] | Yen with Goldman Sachs International [Member] | Contract Amount in US Dollars for USD Values [Member]
Schedule of Investments [Line Items]
Contract Amount/ Notional Amount	[1]	$ (145,748,706)
ProShares UltraShort Yen [Member] | Contracts to Sell [Member] | Yen with UBS AG [Member]
Schedule of Investments [Line Items]
Settlement Date		Jan. 12, 2018	[1]	Jan. 13, 2017	[2]
Contract Amount/ Notional Amount	[2]			$ (284,180,901)				¥ (33,192,173,500)
Unrealized Appreciation (Depreciation)		$ 746,561	[1]	$ 8,613,578	[2]
ProShares UltraShort Yen [Member] | Contracts to Sell [Member] | Yen with UBS AG [Member] | Contract Amount in Local Currency for Other than USD Values [Member]
Schedule of Investments [Line Items]
Contract Amount/ Notional Amount | ¥	[1]					¥ (17,545,808,000)
ProShares UltraShort Yen [Member] | Contracts to Sell [Member] | Yen with UBS AG [Member] | Contract Amount in US Dollars for USD Values [Member]
Schedule of Investments [Line Items]
Contract Amount/ Notional Amount	[1]	$ (156,520,911)
[1]	The positions and counterparties herein are as of December 31, 2017. The Funds continually evaluate different counterparties for their transactions and counterparties are subject to change. New counterparties can be added at any time.
[2]	The positions and counterparties herein are as of December 31, 2016. The Funds continually evaluate different counterparties for their transactions and counterparties are subject to change. New counterparties can be added at any time.

Schedule of Investments - Forwa

Schedule of Investments - Forward Agreements (Detail) - USD ($)		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016
ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)		$ (1,716,163)	[1]	$ 1,384,246	[2]
ProShares UltraShort Silver [Member] | Forward Agreements With Citibank, N.A. based on 0.999 Fine Troy Ounce Silver [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[2],[3]			(1.05%)
Settlement Date	[2]			Jan. 10, 2017
Commitment to (Deliver)/Receive	[2]			$ (1,076,000)
Notional Amount at Value	[2],[4]			(17,480,588)
Unrealized Appreciation (Depreciation)	[2]			$ 610,478
ProShares UltraShort Silver [Member] | Forward agreements with Goldman Sachs International based on 0.999 Fine Troy Ounce Silver [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)		(1.52%)	[1],[5]	(0.80%)	[2],[3]
Settlement Date		Jan. 8, 2018	[1]	Jan. 10, 2017	[2]
Commitment to (Deliver)/Receive		$ (418,500)	[1]	$ (934,500)	[2]
Notional Amount at Value	[4]	(7,061,769)	[1]	(15,181,326)	[2]
Unrealized Appreciation (Depreciation)		$ (486,240)	[1]	$ 323,829	[2]
ProShares UltraShort Silver [Member] | Forward agreements with Societe Generale S.A. based on 0.999 Fine Troy Ounce Silver [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[2],[3]			(0.80%)
Settlement Date	[2]			Jan. 10, 2017
Commitment to (Deliver)/Receive	[2]			$ (156,000)
Notional Amount at Value	[2],[4]			(2,534,314)
Unrealized Appreciation (Depreciation)	[2]			$ 86,543
ProShares UltraShort Silver [Member] | Forward agreements with UBS AG based on 0.999 Fine Troy Ounce Silver [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)		(1.60%)	[1],[5]	(0.82%)	[2],[3]
Settlement Date		Jan. 8, 2018	[1]	Jan. 10, 2017	[2]
Commitment to (Deliver)/Receive		$ (642,000)	[1]	$ (657,000)	[2]
Notional Amount at Value	[4]	(10,833,493)	[1]	(10,673,425)	[2]
Unrealized Appreciation (Depreciation)		$ (482,025)	[1]	363,396	[2]
ProShares UltraShort Silver [Member] | Forward agreements with Citibank N.A. based on 0.999 Fine Troy Ounce Silver [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[1],[5]	(1.85%)
Settlement Date	[1]	Jan. 8, 2018
Commitment to (Deliver)/Receive	[1]	$ (529,000)
Notional Amount at Value	[1],[4]	(8,926,769)
Unrealized Appreciation (Depreciation)	[1]	$ (632,593)
ProShares UltraShort Silver [Member] | Forward agreements with Societe Generale based on 0.999 Fine Troy Ounce Silver [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[1],[5]	(1.45%)
Settlement Date	[1]	Jan. 8, 2018
Commitment to (Deliver)/Receive	[1]	$ (156,000)
Notional Amount at Value	[1],[4]	(2,632,328)
Unrealized Appreciation (Depreciation)	[1]	(115,305)
ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)		$ 3,646,355	[1]	$ (4,431,107)	[2]
ProShares Ultra Gold [Member] | Forward agreements with Citibank N.A. based on 0.995 Fine Troy Ounce Gold [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)		2.25%	[1],[6]	1.35%	[2],[7]
Settlement Date		Jan. 8, 2018	[1]	Jan. 10, 2017	[2]
Commitment to (Deliver)/Receive		$ 53,800	[1]	$ 55,100	[2]
Notional Amount at Value	[4]	69,494,536	[1]	63,158,375	[2]
Unrealized Appreciation (Depreciation)		$ 1,513,310	[1]	$ (1,464,982)	[2]
ProShares Ultra Gold [Member] | Forward agreements with Goldman Sachs International based on 0.995 Fine Troy Ounce Gold [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)		2.30%	[1],[6]	1.55%	[2],[7]
Settlement Date		Jan. 8, 2018	[1]	Jan. 10, 2017	[2]
Commitment to (Deliver)/Receive		$ 38,420	[1]	$ 42,320	[2]
Notional Amount at Value	[4]	49,625,577	[1]	48,509,300	[2]
Unrealized Appreciation (Depreciation)		$ 969,501	[1]	$ (1,112,916)	[2]
ProShares Ultra Gold [Member] | Forward agreements with Societe Generale based on 0.995 Troy Ounce Gold [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)		2.18%	[1],[6]	1.55%	[2],[7]
Settlement Date		Jan. 8, 2018	[1]	Jan. 10, 2017	[2]
Commitment to (Deliver)/Receive		$ 13,000	[1]	$ 23,300	[2]
Notional Amount at Value	[4]	16,791,060	[1]	26,707,625	[2]
Unrealized Appreciation (Depreciation)		$ 218,319	[1]	$ (643,587)	[2]
ProShares Ultra Gold [Member] | Forward agreements with UBS AG based on 0.995 Fine Troy Ounce Gold [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)		2.36%	[1],[6]	1.54%	[2],[7]
Settlement Date		Jan. 8, 2018	[1]	Jan. 10, 2017	[2]
Commitment to (Deliver)/Receive		$ 39,700	[1]	$ 39,800	[2]
Notional Amount at Value	[4]	51,280,490	[1]	45,621,148	[2]
Unrealized Appreciation (Depreciation)		945,225	[1]	(1,209,622)	[2]
ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)		$ 21,735,334	[1]	$ (20,976,189)	[2]
ProShares Ultra Silver [Member] | Forward Agreements With Citibank, N.A. based on 0.999 Fine Troy Ounce Silver [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[2],[8]			1.55%
Settlement Date	[2]			Jan. 10, 2017
Commitment to (Deliver)/Receive	[2]			$ 12,327,000
Notional Amount at Value	[2],[4]			200,263,209
Unrealized Appreciation (Depreciation)	[2]			$ (6,946,009)
ProShares Ultra Silver [Member] | Forward agreements with Goldman Sachs International based on 0.999 Fine Troy Ounce Silver [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)		2.37%	[1],[9]	1.65%	[2],[8]
Settlement Date		Jan. 8, 2018	[1]	Jan. 10, 2017	[2]
Commitment to (Deliver)/Receive		$ 8,119,800	[1]	$ 8,498,800	[2]
Notional Amount at Value	[4]	137,013,505	[1]	138,066,406	[2]
Unrealized Appreciation (Depreciation)		$ 5,873,080	[1]	$ (5,869,092)	[2]
ProShares Ultra Silver [Member] | Forward agreements with Societe Generale S.A. based on 0.999 Fine Troy Ounce Silver [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[2],[8]			1.70%
Settlement Date	[2]			Jan. 10, 2017
Commitment to (Deliver)/Receive	[2]			$ 4,484,000
Notional Amount at Value	[2],[4]			72,845,270
Unrealized Appreciation (Depreciation)	[2]			$ (2,532,729)
ProShares Ultra Silver [Member] | Forward agreements with UBS AG based on 0.999 Fine Troy Ounce Silver [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)		2.50%	[1],[9]	1.72%	[2],[8]
Settlement Date		Jan. 8, 2018	[1]	Jan. 10, 2017	[2]
Commitment to (Deliver)/Receive		$ 8,293,000	[1]	$ 8,632,000	[2]
Notional Amount at Value	[4]	139,941,058	[1]	140,232,882	[2]
Unrealized Appreciation (Depreciation)		$ 5,898,693	[1]	(5,628,359)	[2]
ProShares Ultra Silver [Member] | Forward agreements with Citibank N.A. based on 0.999 Fine Troy Ounce Silver [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[1],[9]	2.35%
Settlement Date	[1]	Jan. 8, 2018
Commitment to (Deliver)/Receive	[1]	$ 10,403,000
Notional Amount at Value	[1],[4]	175,548,544
Unrealized Appreciation (Depreciation)	[1]	$ 7,201,744
ProShares Ultra Silver [Member] | Forward agreements with Societe Generale based on 0.999 Fine Troy Ounce Silver [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[1],[9]	2.35%
Settlement Date	[1]	Jan. 8, 2018
Commitment to (Deliver)/Receive	[1]	$ 3,784,000
Notional Amount at Value	[1],[4]	63,850,838
Unrealized Appreciation (Depreciation)	[1]	2,761,817
ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)		$ (1,488,259)	[1]	$ 3,033,566	[2]
ProShares UltraShort Gold [Member] | Forward agreements with Citibank N.A. based on 0.995 Fine Troy Ounce Gold [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)		(1.75%)	[1],[10]	(0.85%)	[2],[3]
Settlement Date		Jan. 8, 2018	[1]	Jan. 10, 2017	[2]
Commitment to (Deliver)/Receive		$ (18,900)	[1]	$ (44,500)	[2]
Notional Amount at Value	[4]	(24,413,508)	[1]	(51,008,125)	[2]
Unrealized Appreciation (Depreciation)		$ (554,559)	[1]	$ 1,147,811	[2]
ProShares UltraShort Gold [Member] | Forward agreements with Goldman Sachs International based on 0.995 Fine Troy Ounce Gold [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)		(1.45%)	[1],[10]	(0.70%)	[2],[3]
Settlement Date		Jan. 8, 2018	[1]	Jan. 10, 2017	[2]
Commitment to (Deliver)/Receive		$ (12,798)	[1]	$ (25,498)	[2]
Notional Amount at Value	[4]	(16,530,665)	[1]	(29,227,083)	[2]
Unrealized Appreciation (Depreciation)		$ (428,358)	[1]	$ 881,454	[2]
ProShares UltraShort Gold [Member] | Forward agreements with Societe Generale based on 0.995 Troy Ounce Gold [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[1],[10]	(1.28%)
Settlement Date	[1]	Jan. 8, 2018
Commitment to (Deliver)/Receive	[1]	$ (4,800)
Notional Amount at Value	[1],[4]	(6,199,776)
Unrealized Appreciation (Depreciation)	[1]	$ (126,928)
ProShares UltraShort Gold [Member] | Forward agreements with UBS AG based on 0.995 Fine Troy Ounce Gold [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[1],[10]	(1.56%)
Settlement Date	[1]	Jan. 8, 2018
Commitment to (Deliver)/Receive	[1]	$ (12,050)
Notional Amount at Value	[1],[4]	(15,564,985)
Unrealized Appreciation (Depreciation)	[1]	$ (378,414)
ProShares UltraShort Gold [Member] | Forward agreements with Societe Generale S.A. based on 0.995 Fine Troy Ounce Gold [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[2],[3]			(0.65%)
Settlement Date	[2]			Jan. 10, 2017
Commitment to (Deliver)/Receive	[2]			$ (14,600)
Notional Amount at Value	[2],[4]			(16,735,250)
Unrealized Appreciation (Depreciation)	[2]			$ 393,006
ProShares UltraShort Gold [Member] | Forward agreements with UBS AG based on 0.995 Fine Troy Ounce Gold [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[2],[3]			(0.74%)
Settlement Date	[2]			Jan. 10, 2017
Commitment to (Deliver)/Receive	[2]			$ (26,250)
Notional Amount at Value	[2],[4]			(30,089,325)
Unrealized Appreciation (Depreciation)	[2]			$ 611,295
[1]	The positions and counterparties herein are as of December 31, 2017. The Funds continually evaluate different counterparties for their transactions and counterparties are subject to change. New counterparties can be added at any time.
[2]	The positions and counterparties herein are as of December 31, 2016. The Funds continually evaluate different counterparties for their transactions and counterparties are subject to change. New counterparties can be added at any time.
[3]	Reflects the floating financing rate, as of December 31, 2016, on the notional amount of the forward agreement paid to the counterparty or received from the counterparty, excluding any commissions.
[4]	For forward agreements, a positive amount represents "long" exposure to the underlying commodity. A negative amount represents "short" exposure to the underlying commodity.
[5]	Reflects the floating financing rate, as of December 31, 2017, on the notional amount of the forward agreement paid to the counterparty or received from the counterparty, excluding any commissions. Forward Agreements payment is due at termination/maturity.
[6]	Reflects the floating financing rate, as of December 31, 2017 on the notional amount of the forward agreement paid to the counterparty or received from the counterparty, excluding any commissions. Forward Agreements payment is due at termination/maturity.
[7]	Reflects the floating financing rate, as of December 31, 2016, on the notional amount of the forward agreement paid to the counterparty or received from the counterparty, excluding any commissions.
[8]	Reflects the floating financing rate, as of December 31, 2016, on the notional amount of the forward agreement paid to the counterparty or received from the counterparty, excluding any commissions.
[9]	Reflects the floating financing rate, as of December 31, 2017, on the notional amount of the forward agreement paid to the counterparty or received from the counterparty, excluding any commissions.
[10]	Reflects the floating financing rate, as of December 31, 2017, on the notional amount of the forward agreement paid to the counterparty or received from the counterparty, excluding any commissions. Forward Agreements payment is due at termination/maturity.

Organization - Additional Infor

Organization - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017USD ($)Trustshares
Organization [Line Items]
Number of series of Trust | Trust	20
Number of shares of each Leveraged Fund | shares	14
Aggregate purchase price of each Leveraged Fund	$ 350
Period for expected multiple returns	1 day
ProShares UltraShort Bloomberg Crude Oil [Member]
Organization [Line Items]
Aggregate purchase price of each Leveraged Fund	$ 350
ProShares UltraShort Gold [Member]
Organization [Line Items]
Aggregate purchase price of each Leveraged Fund	350
ProShares UltraShort Silver [Member]
Organization [Line Items]
Aggregate purchase price of each Leveraged Fund	350
ProShares UltraShort Euro [Member]
Organization [Line Items]
Aggregate purchase price of each Leveraged Fund	350
ProShares UltraShort Yen [Member]
Organization [Line Items]
Aggregate purchase price of each Leveraged Fund	350
ProShares Ultra Bloomberg Crude Oil [Member]
Organization [Line Items]
Aggregate purchase price of each Leveraged Fund	350
ProShares Ultra Gold [Member]
Organization [Line Items]
Aggregate purchase price of each Leveraged Fund	350
ProShares Ultra Silver [Member]
Organization [Line Items]
Aggregate purchase price of each Leveraged Fund	350
ProShares Ultra Euro [Member]
Organization [Line Items]
Aggregate purchase price of each Leveraged Fund	350
ProShares Ultra Yen [Member]
Organization [Line Items]
Aggregate purchase price of each Leveraged Fund	$ 350

Organization - Schedule of Shar

Organization - Schedule of Share Splits and Reverse Share Splits (Detail)	12 Months Ended
	Dec. 31, 2017
ProShares Short VIX Short-Term Futures ETF [Member] | January 21, 2014 Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	May 20, 2015
Date Trading Resumed at Post- Split Price	May 20, 2015
Type of Split	1-for-5 reverse Share split
ProShares Short VIX Short-Term Futures ETF [Member] | July Twelve Two Thousand And Seventeen Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	Jul. 12, 2017
Date Trading Resumed at Post- Split Price	Jul. 17, 2017
Type of Split	2-for-1 Share split
ProShares Ultra VIX Short-Term Futures ETF [Member] | January 21, 2014 Reverse Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	May 20, 2015
Date Trading Resumed at Post- Split Price	May 20, 2015
Type of Split	1-for-5 reverse Share split
ProShares Ultra VIX Short-Term Futures ETF [Member] | May 20, 2015 Reverse Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	Nov. 13, 2015
Date Trading Resumed at Post- Split Price	Nov. 13, 2015
Type of Split	2-for-1 Share split
ProShares Ultra VIX Short-Term Futures ETF [Member] | July 25, 2016 Reverse Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	Jul. 25, 2016
Date Trading Resumed at Post- Split Price	Jul. 25, 2016
Type of Split	1-for-5 reverse Share split
ProShares Ultra VIX Short-Term Futures ETF [Member] | January 11, 2017 Reverse Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	Jan. 11, 2017
Date Trading Resumed at Post- Split Price	Jan. 12, 2017
Type of Split	1-for-5 reverse Share split
ProShares Ultra VIX Short-Term Futures ETF [Member] | July Fourteen Two Thousand And Seventeen Reverse Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	Jul. 14, 2017
Date Trading Resumed at Post- Split Price	Jul. 17, 2017
Type of Split	1-for-4 reverse Share split
ProShares Ultra Silver [Member] | January 21, 2014 Reverse Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	May 20, 2015
Date Trading Resumed at Post- Split Price	May 20, 2015
Type of Split	1-for-4 reverse Share split
ProShares VIX Mid-Term Futures ETF [Member] | November 6, 2014 Reverse Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	May 20, 2015
Date Trading Resumed at Post- Split Price	May 20, 2015
Type of Split	1-for-4 reverse Share split
ProShares UltraShort Bloomberg Natural Gas [Member] | July 20, 2016 Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	Jul. 20, 2016
Date Trading Resumed at Post- Split Price	Jul. 25, 2016
Type of Split	3-for-1 Share split
ProShares VIX Short-Term Futures ETF [Member] | July 25, 2016 Reverse Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	Jul. 25, 2016
Date Trading Resumed at Post- Split Price	Jul. 25, 2016
Type of Split	1-for-5 reverse Share split
ProShares VIX Short-Term Futures ETF [Member] | July Fourteen Two Thousand And Seventeen Reverse Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	Jul. 14, 2017
Date Trading Resumed at Post- Split Price	Jul. 17, 2017
Type of Split	1-for-4 reverse Share split
ProShares UltraShort Bloomberg Crude Oil [Member] | January 11, 2017 Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	Jan. 11, 2017
Date Trading Resumed at Post- Split Price	Jan. 12, 2017
Type of Split	2-for-1 Share split
ProShares Ultra Bloomberg Crude Oil [Member] | January 11, 2017 Reverse Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	Jan. 11, 2017
Date Trading Resumed at Post- Split Price	Jan. 12, 2017
Type of Split	1-for-2 reverse Share split

Significant Accounting Polici34

Significant Accounting Policies - Cut-off Times and Times of Calculation of Funds' Final Net Asset Value for Creation and Redemption of Fund Shares (Detail)	12 Months Ended
	Dec. 31, 2017
ProShares UltraShort Silver [Member]
Net Asset Value [Line Items]
Create/Redeem Cut-off	6:30 a.m.
NAV Calculation Time	7:00 a.m.
NAV Calculation Date	December 29
ProShares Ultra Silver [Member]
Net Asset Value [Line Items]
Create/Redeem Cut-off	6:30 a.m.
NAV Calculation Time	7:00 a.m.
NAV Calculation Date	December 29
ProShares UltraShort Gold [Member]
Net Asset Value [Line Items]
Create/Redeem Cut-off	9:30 a.m.
NAV Calculation Time	10:00 a.m.
NAV Calculation Date	December 29
ProShares Ultra Gold [Member]
Net Asset Value [Line Items]
Create/Redeem Cut-off	9:30 a.m.
NAV Calculation Time	10:00 a.m.
NAV Calculation Date	December 29
ProShares UltraShort Bloomberg Crude Oil [Member]
Net Asset Value [Line Items]
Create/Redeem Cut-off	9:30 a.m.
NAV Calculation Time	10:00 a.m.
NAV Calculation Date	December 29
ProShares Ultra Bloomberg Crude Oil [Member]
Net Asset Value [Line Items]
Create/Redeem Cut-off	2:00 p.m.
NAV Calculation Time	2:30 p.m.
NAV Calculation Date	December 29
Pro Shares UltraPro 3X Short Crude Oil ETF [Member]
Net Asset Value [Line Items]
Create/Redeem Cut-off	2:00 p.m.
NAV Calculation Time	2:30 p.m.
NAV Calculation Date	December 29
ProShares UltraPro 3x Crude Oil ETF [Member]
Net Asset Value [Line Items]
Create/Redeem Cut-off	2:00 p.m.
NAV Calculation Time	2:30 p.m.
NAV Calculation Date	December 29
ProShares UltraShort Bloomberg Natural Gas [Member]
Net Asset Value [Line Items]
Create/Redeem Cut-off	2:00 p.m.
NAV Calculation Time	2:30 p.m.
NAV Calculation Date	December 29
ProShares Ultra Bloomberg Natural Gas [Member]
Net Asset Value [Line Items]
Create/Redeem Cut-off	2:00 p.m.
NAV Calculation Time	2:30 p.m.
NAV Calculation Date	December 29
ProShares UltraShort Australian Dollar [Member]
Net Asset Value [Line Items]
Create/Redeem Cut-off	3:00 p.m.
NAV Calculation Time	4:00 p.m.
NAV Calculation Date	December 29
ProShares Short Euro [Member]
Net Asset Value [Line Items]
Create/Redeem Cut-off	3:00 p.m.
NAV Calculation Time	4:00 p.m.
NAV Calculation Date	December 29
ProShares UltraShort Euro [Member]
Net Asset Value [Line Items]
Create/Redeem Cut-off	3:00 p.m.
NAV Calculation Time	4:00 p.m.
NAV Calculation Date	December 29
ProShares Ultra Euro [Member]
Net Asset Value [Line Items]
Create/Redeem Cut-off	3:00 p.m.
NAV Calculation Time	4:00 p.m.
NAV Calculation Date	December 29
ProShares UltraShort Yen [Member]
Net Asset Value [Line Items]
Create/Redeem Cut-off	3:00 p.m.
NAV Calculation Time	4:00 p.m.
NAV Calculation Date	December 29
ProShares Ultra Yen [Member]
Net Asset Value [Line Items]
Create/Redeem Cut-off	3:00 p.m.
NAV Calculation Time	4:00 p.m.
NAV Calculation Date	December 29
ProShares VIX Short-Term Futures ETF [Member]
Net Asset Value [Line Items]
Create/Redeem Cut-off	3:00 p.m.
NAV Calculation Time	4:00 p.m.
NAV Calculation Date	December 29
ProShares Short VIX Short-Term Futures ETF [Member]
Net Asset Value [Line Items]
Create/Redeem Cut-off	3:00 p.m.
NAV Calculation Time	4:00 p.m.
NAV Calculation Date	December 29
ProShares Ultra VIX Short-Term Futures ETF [Member]
Net Asset Value [Line Items]
Create/Redeem Cut-off	2:00 p.m.
NAV Calculation Time	4:15 p.m.
NAV Calculation Date	December 29
ProShares VIX Mid-Term Futures ETF [Member]
Net Asset Value [Line Items]
Create/Redeem Cut-off	2:00 p.m.
NAV Calculation Time	4:15 p.m.
NAV Calculation Date	December 29

Significant Accounting Polici35

Significant Accounting Policies - Valuation of Investments using Fair Value Hierarchy (Detail) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
ProShares Short Euro [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	$ 6,829,947	$ 13,297,728
ProShares Short VIX Short-Term Futures ETF [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	511,952,093	160,086,825
ProShares Ultra Bloomberg Crude Oil [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	533,700,242	945,945,743
ProShares Ultra Bloomberg Natural Gas [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	58,187,166	38,720,368
ProShares Ultra Euro [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	7,260,387	11,317,821
ProShares Ultra Gold [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	92,536,679	90,906,554
ProShares Ultra Silver [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	257,318,650	274,297,250
ProShares Ultra VIX Short-Term Futures ETF [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	253,067,012	426,699,558
ProShares Ultra Yen [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	1,963,109	4,940,803
ProShares UltraShort Australian Dollar [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	11,090,684	14,091,959
Proshares Ultra Pro 3X Crude Oil ETF [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	1,417,998
Pro Shares UltraPro 3X Short Crude Oil ETF [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	(2,988,155)
ProShares UltraShort Bloomberg Crude Oil [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	219,077,033	192,060,689
ProShares UltraShort Bloomberg Natural Gas [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	2,902,702	2,417,120
ProShares UltraShort Euro [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	198,425,897	353,538,718
ProShares UltraShort Gold [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	30,484,181	63,593,101
ProShares UltraShort Silver [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	16,632,048	22,961,875
ProShares UltraShort Yen [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	133,361,615	273,847,250
ProShares VIX Mid-Term Futures ETF [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	18,778,235	44,197,990
ProShares VIX Short-Term Futures ETF [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	130,083,727	147,522,581
Total Trust [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	2,482,081,250	3,080,443,933
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares Short Euro [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	6,996,235	13,164,828
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	494,910,644	170,396,436
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	459,515,902	885,050,007
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	50,961,356	36,183,648
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares Ultra Euro [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	6,996,235	11,891,831
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares Ultra Gold [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	88,884,844	95,356,621
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares Ultra Silver [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	235,581,716	295,300,799
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	287,533,132	434,671,795
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares Ultra Yen [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	1,997,933	5,282,879
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares UltraShort Australian Dollar [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	11,983,904	12,909,619
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	253,646,823	205,694,385
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares UltraShort Bloomberg Natural Gas [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	3,999,751	2,899,151
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares UltraShort Euro [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	204,770,166	337,375,787
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares UltraShort Gold [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	31,977,900	60,540,555
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares UltraShort Silver [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	18,349,861	21,550,319
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares UltraShort Yen [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	131,834,352	257,102,313
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	20,993,515	45,486,235
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | ProShares VIX Short-Term Futures ETF [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	134,845,604	147,991,233
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member] | Total Trust [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	2,445,779,873	3,038,848,441
Level I - Quoted Prices [Member] | Futures Contracts [Member] | ProShares Short Euro [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	(166,288)	132,900
Level I - Quoted Prices [Member] | Futures Contracts [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	17,041,449	(10,309,611)
Level I - Quoted Prices [Member] | Futures Contracts [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	11,945,979	5,537,165
Level I - Quoted Prices [Member] | Futures Contracts [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	7,225,810	2,536,720
Level I - Quoted Prices [Member] | Futures Contracts [Member] | ProShares Ultra Gold [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	5,480	(18,960)
Level I - Quoted Prices [Member] | Futures Contracts [Member] | ProShares Ultra Silver [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	1,600	(27,360)
Level I - Quoted Prices [Member] | Futures Contracts [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	(34,466,120)	(7,972,237)
Level I - Quoted Prices [Member] | Futures Contracts [Member] | ProShares UltraShort Australian Dollar [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	(893,220)	1,182,340
Level I - Quoted Prices [Member] | Futures Contracts [Member] | Proshares Ultra Pro 3X Crude Oil ETF [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	1,417,998
Level I - Quoted Prices [Member] | Futures Contracts [Member] | Pro Shares UltraPro 3X Short Crude Oil ETF [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	(2,988,155)
Level I - Quoted Prices [Member] | Futures Contracts [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	(3,962,648)	(1,426,815)
Level I - Quoted Prices [Member] | Futures Contracts [Member] | ProShares UltraShort Bloomberg Natural Gas [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	(1,097,049)	(482,031)
Level I - Quoted Prices [Member] | Futures Contracts [Member] | ProShares UltraShort Gold [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	(5,460)	18,980
Level I - Quoted Prices [Member] | Futures Contracts [Member] | ProShares UltraShort Silver [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	(1,650)	27,310
Level I - Quoted Prices [Member] | Futures Contracts [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	(2,215,280)	(1,288,245)
Level I - Quoted Prices [Member] | Futures Contracts [Member] | ProShares VIX Short-Term Futures ETF [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	(4,761,877)	(468,652)
Level I - Quoted Prices [Member] | Futures Contracts [Member] | Total Trust [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	(12,919,431)	(12,558,496)
Level II - Other Significant Observable Inputs [Member] | Forward Agreements [Member] | ProShares Ultra Gold [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	3,646,355	(4,431,107)
Level II - Other Significant Observable Inputs [Member] | Forward Agreements [Member] | ProShares Ultra Silver [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	21,735,334	(20,976,189)
Level II - Other Significant Observable Inputs [Member] | Forward Agreements [Member] | ProShares UltraShort Gold [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	(1,488,259)	3,033,566
Level II - Other Significant Observable Inputs [Member] | Forward Agreements [Member] | ProShares UltraShort Silver [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	(1,716,163)	1,384,246
Level II - Other Significant Observable Inputs [Member] | Forward Agreements [Member] | Total Trust [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	22,177,267	(20,989,484)
Level II - Other Significant Observable Inputs [Member] | Foreign Currency Forward Contracts [Member] | ProShares Ultra Euro [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	264,152	(574,010)
Level II - Other Significant Observable Inputs [Member] | Foreign Currency Forward Contracts [Member] | ProShares Ultra Yen [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	(34,824)	(342,076)
Level II - Other Significant Observable Inputs [Member] | Foreign Currency Forward Contracts [Member] | ProShares UltraShort Euro [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	(6,344,269)	16,162,931
Level II - Other Significant Observable Inputs [Member] | Foreign Currency Forward Contracts [Member] | ProShares UltraShort Yen [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	1,527,263	16,744,937
Level II - Other Significant Observable Inputs [Member] | Foreign Currency Forward Contracts [Member] | Total Trust [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	(4,587,678)	31,991,782
Level II - Other Significant Observable Inputs [Member] | Swap Agreements [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	62,238,361	55,358,571
Level II - Other Significant Observable Inputs [Member] | Swap Agreements [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	(30,607,142)	(12,206,881)
Level II - Other Significant Observable Inputs [Member] | Swap Agreements [Member] | Total Trust [Member]
Significant Accounting Policies [Line Items]
Investments, fair value disclosure	$ 31,631,219	$ 43,151,690

Significant Accounting Polici36

Significant Accounting Policies - Additional Information (Detail) - USD ($)	Jul. 31, 2014	Dec. 31, 2016
Significant Accounting Policies [Line Items]
Level III portfolio investments		$ 0
Minimum [Member] | Volatility Index Fund [Member]
Significant Accounting Policies [Line Items]
Percentage of brokerage commissions exceed variable create/redeem fees	0.02%

Investments - Fair Value of Der

Investments - Fair Value of Derivative Instruments (Detail) - USD ($)		Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset not accounted as hedging instrument, Unrealized Appreciation	[1]	$ 136,734,724	$ 118,541,276
Derivative liability not accounted as hedging instrument, Unrealized Depreciation	[1]	100,433,347	76,945,784
VIX Futures Contracts [Member] | Payable on Open Futures Contracts [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability not accounted as hedging instrument, Unrealized Depreciation	[1]	4,452,100	10,309,611
VIX Futures Contracts [Member] | Payable on Open Futures Contracts [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability not accounted as hedging instrument, Unrealized Depreciation	[1]	38,440,762	21,567,112
VIX Futures Contracts [Member] | Payable on Open Futures Contracts [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability not accounted as hedging instrument, Unrealized Depreciation	[1]	2,215,280	1,356,620
VIX Futures Contracts [Member] | Payable on Open Futures Contracts [Member] | ProShares VIX Short-Term Futures ETF [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability not accounted as hedging instrument, Unrealized Depreciation	[1]	5,471,585	2,742,526
VIX Futures Contracts [Member] | Receivables on Open Futures Contracts [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset not accounted as hedging instrument, Unrealized Appreciation	[1]	21,493,549	2,273,874
VIX Futures Contracts [Member] | Receivables on Open Futures Contracts [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset not accounted as hedging instrument, Unrealized Appreciation	[1]	3,974,642	13,594,875
VIX Futures Contracts [Member] | Receivables on Open Futures Contracts [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset not accounted as hedging instrument, Unrealized Appreciation	[1]		68,375
VIX Futures Contracts [Member] | Receivables on Open Futures Contracts [Member] | ProShares VIX Short-Term Futures ETF [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset not accounted as hedging instrument, Unrealized Appreciation	[1]	709,708
Commodity Contracts [Member] | Payable on Open Futures Contracts, Unrealized Depreciation on Swaps and/or Forward Agreements [Member] | Pro Shares UltraPro 3X Short Crude Oil ETF [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability not accounted as hedging instrument, Unrealized Depreciation	[1]	2,988,155
Commodity Contracts [Member] | Payable on Open Futures Contracts, Unrealized Depreciation on Swaps and/or Forward Agreements [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability not accounted as hedging instrument, Unrealized Depreciation	[1]	34,569,790	13,633,696
Commodity Contracts [Member] | Payable on Open Futures Contracts, Unrealized Depreciation on Swaps and/or Forward Agreements [Member] | ProShares UltraShort Bloomberg Natural Gas [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability not accounted as hedging instrument, Unrealized Depreciation	[1]	1,097,049	482,031
Commodity Contracts [Member] | Payable on Open Futures Contracts, Unrealized Depreciation on Swaps and/or Forward Agreements [Member] | ProShares UltraShort Gold [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability not accounted as hedging instrument, Unrealized Depreciation	[1]	1,493,719
Commodity Contracts [Member] | Payable on Open Futures Contracts, Unrealized Depreciation on Swaps and/or Forward Agreements [Member] | ProShares UltraShort Silver [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability not accounted as hedging instrument, Unrealized Depreciation	[1]	1,717,813
Commodity Contracts [Member] | Payable on Open Futures Contracts, Unrealized Depreciation on Swaps and/or Forward Agreements [Member] | ProShares Ultra Gold [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability not accounted as hedging instrument, Unrealized Depreciation	[1]		4,450,067
Commodity Contracts [Member] | Payable on Open Futures Contracts, Unrealized Depreciation on Swaps and/or Forward Agreements [Member] | ProShares Ultra Silver [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability not accounted as hedging instrument, Unrealized Depreciation	[1]		21,003,549
Commodity Contracts [Member] | Receivables on Open Futures Contracts, Unrealized Appreciation on Swaps and/or Forwards Agreements [Member] | ProShares UltraShort Gold [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset not accounted as hedging instrument, Unrealized Appreciation	[1]		3,052,546
Commodity Contracts [Member] | Receivables on Open Futures Contracts, Unrealized Appreciation on Swaps and/or Forwards Agreements [Member] | ProShares UltraShort Silver [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset not accounted as hedging instrument, Unrealized Appreciation	[1]		1,411,556
Commodity Contracts [Member] | Receivables on Open Futures Contracts, Unrealized Appreciation on Swaps and/or Forwards Agreements [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset not accounted as hedging instrument, Unrealized Appreciation	[1]	74,184,340	60,895,736
Commodity Contracts [Member] | Receivables on Open Futures Contracts, Unrealized Appreciation on Swaps and/or Forwards Agreements [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset not accounted as hedging instrument, Unrealized Appreciation	[1]	7,225,810	2,536,720
Commodity Contracts [Member] | Receivables on Open Futures Contracts, Unrealized Appreciation on Swaps and/or Forwards Agreements [Member] | ProShares Ultra Gold [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset not accounted as hedging instrument, Unrealized Appreciation	[1]	3,651,835
Commodity Contracts [Member] | Receivables on Open Futures Contracts, Unrealized Appreciation on Swaps and/or Forwards Agreements [Member] | ProShares Ultra Silver [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset not accounted as hedging instrument, Unrealized Appreciation	[1]	21,736,934
Commodity Contracts [Member] | Receivables on Open Futures Contracts, Unrealized Appreciation on Swaps and/or Forwards Agreements [Member] | ProShares UltraPro 3x Crude Oil ETF [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset not accounted as hedging instrument, Unrealized Appreciation	[1]	1,417,998
Foreign Exchange Contracts [Member] | Unrealized Depreciation on Foreign Currency Forward Contracts and Payable on Open Futures Contracts [Member] | ProShares Short Euro [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability not accounted as hedging instrument, Unrealized Depreciation	[1]	166,288
Foreign Exchange Contracts [Member] | Unrealized Depreciation on Foreign Currency Forward Contracts and Payable on Open Futures Contracts [Member] | ProShares Ultra Euro [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability not accounted as hedging instrument, Unrealized Depreciation		57,457	576,558
Foreign Exchange Contracts [Member] | Unrealized Depreciation on Foreign Currency Forward Contracts and Payable on Open Futures Contracts [Member] | ProShares Ultra Yen [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability not accounted as hedging instrument, Unrealized Depreciation		34,824	342,455
Foreign Exchange Contracts [Member] | Unrealized Depreciation on Foreign Currency Forward Contracts and Payable on Open Futures Contracts [Member] | ProShares UltraShort Australian Dollar [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability not accounted as hedging instrument, Unrealized Depreciation	[1]	893,220
Foreign Exchange Contracts [Member] | Unrealized Depreciation on Foreign Currency Forward Contracts and Payable on Open Futures Contracts [Member] | ProShares UltraShort Euro [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability not accounted as hedging instrument, Unrealized Depreciation		6,793,571	356,139
Foreign Exchange Contracts [Member] | Unrealized Depreciation on Foreign Currency Forward Contracts and Payable on Open Futures Contracts [Member] | ProShares UltraShort Yen [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability not accounted as hedging instrument, Unrealized Depreciation		41,734	125,420
Foreign Exchange Contracts [Member] | Unrealized Appreciation on Foreign Currency Forward Contracts and Receivables on Open Futures Contracts [Member] | ProShares Short Euro [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset not accounted as hedging instrument, Unrealized Appreciation	[1]		132,900
Foreign Exchange Contracts [Member] | Unrealized Appreciation on Foreign Currency Forward Contracts and Receivables on Open Futures Contracts [Member] | ProShares Ultra Euro [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset not accounted as hedging instrument, Unrealized Appreciation		321,609	2,548
Foreign Exchange Contracts [Member] | Unrealized Appreciation on Foreign Currency Forward Contracts and Receivables on Open Futures Contracts [Member] | ProShares Ultra Yen [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset not accounted as hedging instrument, Unrealized Appreciation			379
Foreign Exchange Contracts [Member] | Unrealized Appreciation on Foreign Currency Forward Contracts and Receivables on Open Futures Contracts [Member] | ProShares UltraShort Australian Dollar [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset not accounted as hedging instrument, Unrealized Appreciation	[1]		1,182,340
Foreign Exchange Contracts [Member] | Unrealized Appreciation on Foreign Currency Forward Contracts and Receivables on Open Futures Contracts [Member] | ProShares UltraShort Euro [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset not accounted as hedging instrument, Unrealized Appreciation		449,302	16,519,070
Foreign Exchange Contracts [Member] | Unrealized Appreciation on Foreign Currency Forward Contracts and Receivables on Open Futures Contracts [Member] | ProShares UltraShort Yen [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset not accounted as hedging instrument, Unrealized Appreciation		$ 1,568,997	$ 16,870,357
[1]	Includes cumulative appreciation/depreciation of futures contracts as reported in the Schedules of Investments. Only current day's variation margin is reported within the Statements of Financial Condition in receivable/payable on open futures contracts.

Investments - Effect of Derivat

Investments - Effect of Derivative Instruments on Statements of Operations (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	$ (438,481,644)	$ (1,319,878,684)	$ (1,164,748,605)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	(5,294,115)	157,908,519	(39,455,078)
VIX Futures Contracts [Member] | Net Realized Gain (Loss) on Futures Contracts/Changes in Unrealized Appreciation/Depreciation on Futures Contracts [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	897,400,516	440,391,389	69,793,028
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	27,351,060	(21,056,026)	27,098,564
VIX Futures Contracts [Member] | Net Realized Gain (Loss) on Futures Contracts/Changes in Unrealized Appreciation/Depreciation on Futures Contracts [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	(1,020,750,851)	(1,567,340,688)	(392,174,228)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	(26,493,883)	(19,866,703)	(27,690,787)
VIX Futures Contracts [Member] | Net Realized Gain (Loss) on Futures Contracts/Changes in Unrealized Appreciation/Depreciation on Futures Contracts [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	(25,319,770)	(11,085,506)	(3,335,936)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	(927,035)	(943,885)	(605,025)
VIX Futures Contracts [Member] | Net Realized Gain (Loss) on Futures Contracts/Changes in Unrealized Appreciation/Depreciation on Futures Contracts [Member] | ProShares VIX Short-Term Futures ETF [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	(194,005,568)	(195,475,791)	(19,408,543)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	(4,293,225)	609,973	(7,343,245)
Commodity Contracts [Member] | Net Realized Gain (Loss) on Futures Contracts, Swap and/or Forward Agreements/Changes in Unrealized Appreciation/Depreciation on Futures Contracts, Swap and/or Forward Agreements [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	22,146,212	74,061,040	(896,177,096)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	13,288,604	151,001,639	32,549,981
Commodity Contracts [Member] | Net Realized Gain (Loss) on Futures Contracts, Swap and/or Forward Agreements/Changes in Unrealized Appreciation/Depreciation on Futures Contracts, Swap and/or Forward Agreements [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	(40,793,265)	17,571,809	(100,776,817)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	4,689,090	(3,776,159)	41,202,162
Commodity Contracts [Member] | Net Realized Gain (Loss) on Futures Contracts, Swap and/or Forward Agreements/Changes in Unrealized Appreciation/Depreciation on Futures Contracts, Swap and/or Forward Agreements [Member] | ProShares Ultra Gold [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	11,484,410	5,816,565	(18,605,815)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	8,101,902	(2,194,272)	(4,311,529)
Commodity Contracts [Member] | Net Realized Gain (Loss) on Futures Contracts, Swap and/or Forward Agreements/Changes in Unrealized Appreciation/Depreciation on Futures Contracts, Swap and/or Forward Agreements [Member] | ProShares Ultra Silver [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	(31,762,834)	62,342,441	(78,309,309)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	42,740,483	1,566,582	(10,173,451)
Commodity Contracts [Member] | Net Realized Gain (Loss) on Futures Contracts, Swap and/or Forward Agreements/Changes in Unrealized Appreciation/Depreciation on Futures Contracts, Swap and/or Forward Agreements [Member] | Proshares Ultra Pro 3X Crude Oil ETF [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	6,018,618
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	1,417,998
Commodity Contracts [Member] | Net Realized Gain (Loss) on Futures Contracts, Swap and/or Forward Agreements/Changes in Unrealized Appreciation/Depreciation on Futures Contracts, Swap and/or Forward Agreements [Member] | Pro Shares UltraPro 3X Short Crude Oil ETF [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	(7,046,628)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	(2,988,155)
Commodity Contracts [Member] | Net Realized Gain (Loss) on Futures Contracts, Swap and/or Forward Agreements/Changes in Unrealized Appreciation/Depreciation on Futures Contracts, Swap and/or Forward Agreements [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	(6,491,060)	(67,752,164)	91,670,324
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	(20,936,094)	(22,510,865)	(33,947,511)
Commodity Contracts [Member] | Net Realized Gain (Loss) on Futures Contracts, Swap and/or Forward Agreements/Changes in Unrealized Appreciation/Depreciation on Futures Contracts, Swap and/or Forward Agreements [Member] | ProShares UltraShort Bloomberg Natural Gas [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	4,762,532	586,860	15,212,804
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	(615,018)	1,989,133	(6,412,629)
Commodity Contracts [Member] | Net Realized Gain (Loss) on Futures Contracts, Swap and/or Forward Agreements/Changes in Unrealized Appreciation/Depreciation on Futures Contracts, Swap and/or Forward Agreements [Member] | ProShares UltraShort Gold [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	(6,993,557)	(12,240,751)	12,707,635
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	(4,546,265)	1,238,384	4,101,460
Commodity Contracts [Member] | Net Realized Gain (Loss) on Futures Contracts, Swap and/or Forward Agreements/Changes in Unrealized Appreciation/Depreciation on Futures Contracts, Swap and/or Forward Agreements [Member] | ProShares UltraShort Silver [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	1,153,393	(17,554,714)	10,759,545
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	(3,129,369)	(3,372,693)	4,187,736
Foreign Exchange Contracts [Member] | Net realized gain (loss) on futures and/or foreign currency forward contracts/changes in unrealized appreciation/depreciation on futures and/or foreign currency forward contracts [Member] | ProShares Short Euro [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	(1,161,987)	663,774	1,559,425
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	(299,188)	(110,538)	(141,893)
Foreign Exchange Contracts [Member] | Net realized gain (loss) on futures and/or foreign currency forward contracts/changes in unrealized appreciation/depreciation on futures and/or foreign currency forward contracts [Member] | ProShares Ultra Euro [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	2,212,313	138,959	(1,982,208)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	838,162	(1,178,930)	708,291
Foreign Exchange Contracts [Member] | Net realized gain (loss) on futures and/or foreign currency forward contracts/changes in unrealized appreciation/depreciation on futures and/or foreign currency forward contracts [Member] | ProShares Ultra Yen [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	(46,195)	717,086	(472,913)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	307,252	(603,387)	276,556
Foreign Exchange Contracts [Member] | Net realized gain (loss) on futures and/or foreign currency forward contracts/changes in unrealized appreciation/depreciation on futures and/or foreign currency forward contracts [Member] | ProShares UltraShort Australian Dollar [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	(866,771)	(2,787,204)	4,330,463
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	(2,075,560)	1,602,610	(1,163,751)
Foreign Exchange Contracts [Member] | Net realized gain (loss) on futures and/or foreign currency forward contracts/changes in unrealized appreciation/depreciation on futures and/or foreign currency forward contracts [Member] | ProShares UltraShort Euro [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	(39,691,680)	(25,711,518)	131,651,572
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	(22,507,200)	44,873,267	(45,473,330)
Foreign Exchange Contracts [Member] | Net realized gain (loss) on futures and/or foreign currency forward contracts/changes in unrealized appreciation/depreciation on futures and/or foreign currency forward contracts [Member] | ProShares UltraShort Yen [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	(8,729,472)	(22,220,271)	8,809,464
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	$ (15,217,674)	$ 30,640,389	$ (12,316,677)

Investments - Offsetting of Fin

Investments - Offsetting of Financial Assets and Liabilities (Detail) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
ProShares Ultra Bloomberg Crude Oil [Member] | Swap Agreements [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets presented in the Statements of Financial Condition	$ 62,238,361	$ 55,358,571
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Assets presented in the Statements of Financial Condition	62,238,361	55,358,571
Gross Amounts Offset in the Statements of Financial Condition	0	0
ProShares Ultra Euro [Member] | Foreign Currency Forward Contracts [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets presented in the Statements of Financial Condition	321,609	2,548
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Assets presented in the Statements of Financial Condition	321,609	2,548
Gross Amounts of Recognized Liabilities presented in the Statements of Financial Condition	57,457	576,558
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Liabilities presented in the Statements of Financial Condition	57,457	576,558
ProShares Ultra Gold [Member] | Forward Agreements [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets presented in the Statements of Financial Condition	3,646,355
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Assets presented in the Statements of Financial Condition	3,646,355
Gross Amounts of Recognized Liabilities presented in the Statements of Financial Condition		4,431,107
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Liabilities presented in the Statements of Financial Condition		4,431,107
ProShares Ultra Silver [Member] | Forward Agreements [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets presented in the Statements of Financial Condition	21,735,334
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Assets presented in the Statements of Financial Condition	21,735,334
Gross Amounts of Recognized Liabilities presented in the Statements of Financial Condition		20,976,189
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Liabilities presented in the Statements of Financial Condition		20,976,189
ProShares UltraShort Bloomberg Crude Oil [Member] | Swap Agreements [Member]
Derivative [Line Items]
Gross Amounts Offset in the Statements of Financial Condition	0	0
Gross Amounts of Recognized Liabilities presented in the Statements of Financial Condition	30,607,142	12,206,881
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Liabilities presented in the Statements of Financial Condition	30,607,142	12,206,881
ProShares UltraShort Euro [Member] | Foreign Currency Forward Contracts [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets presented in the Statements of Financial Condition	449,302	16,519,070
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Assets presented in the Statements of Financial Condition	449,302	16,519,070
Gross Amounts of Recognized Liabilities presented in the Statements of Financial Condition	6,793,571	356,139
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Liabilities presented in the Statements of Financial Condition	6,793,571	356,139
ProShares UltraShort Gold [Member] | Forward Agreements [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets presented in the Statements of Financial Condition		3,033,566
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Assets presented in the Statements of Financial Condition		3,033,566
Gross Amounts of Recognized Liabilities presented in the Statements of Financial Condition	1,488,259
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Liabilities presented in the Statements of Financial Condition	1,488,259
ProShares UltraShort Silver [Member] | Forward Agreements [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets presented in the Statements of Financial Condition		1,384,246
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Assets presented in the Statements of Financial Condition		1,384,246
Gross Amounts of Recognized Liabilities presented in the Statements of Financial Condition	1,716,163
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Liabilities presented in the Statements of Financial Condition	1,716,163
ProShares UltraShort Yen [Member] | Foreign Currency Forward Contracts [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets presented in the Statements of Financial Condition	1,568,997	16,870,357
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Assets presented in the Statements of Financial Condition	1,568,997	16,870,357
Gross Amounts of Recognized Liabilities presented in the Statements of Financial Condition	41,734	125,420
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Liabilities presented in the Statements of Financial Condition	41,734	125,420
ProShares Ultra Yen [Member] | Foreign Currency Forward Contracts [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets presented in the Statements of Financial Condition		379
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Assets presented in the Statements of Financial Condition		379
Gross Amounts of Recognized Liabilities presented in the Statements of Financial Condition	34,824	342,455
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Liabilities presented in the Statements of Financial Condition	$ 34,824	$ 342,455

Investments - Gross Amounts Not

Investments - Gross Amounts Not Offset in Statements of Financial Condition (Detail) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
ProShares Ultra Bloomberg Crude Oil [Member] | Citibank N.A. [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	$ 19,815,892	$ 18,427,009
Net Amounts of Assets presented in the Statements of Financial Condition	19,815,892	18,427,009
ProShares Ultra Bloomberg Crude Oil [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	16,654,031	14,016,906
Financial Instruments for the Benefit of (the Funds) / the Counterparties	(14,861,090)	(14,016,906)
Net Amounts of Assets presented in the Statements of Financial Condition	1,792,941
ProShares Ultra Bloomberg Crude Oil [Member] | Societe Generale S.A. [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	9,003,519	8,661,821
Financial Instruments for the Benefit of (the Funds) / the Counterparties	(8,525,505)	(8,661,821)
Net Amounts of Assets presented in the Statements of Financial Condition	478,014
ProShares Ultra Bloomberg Crude Oil [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	16,764,919	14,252,835
Financial Instruments for the Benefit of (the Funds) / the Counterparties	(15,477,566)
Cash Collateral for the Benefit of (the Funds) / the Counterparties		(14,252,835)
Net Amounts of Assets presented in the Statements of Financial Condition	1,287,353
ProShares Ultra Euro [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	102,424
Net Amounts of Assets presented in the Statements of Financial Condition	102,424
Amounts of Recognized Assets presented in the Statements of Financial Condition		(239,256)
Financial Instruments for the Benefit of (the Funds) / the Counterparties		239,256
Net Amounts of Liabilities presented in the Statements of Financial Condition		0
ProShares Ultra Euro [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	161,728
Net Amounts of Assets presented in the Statements of Financial Condition	161,728
Amounts of Recognized Assets presented in the Statements of Financial Condition		(334,754)
Financial Instruments for the Benefit of (the Funds) / the Counterparties		334,754
Net Amounts of Liabilities presented in the Statements of Financial Condition		0
ProShares Ultra Gold [Member] | Citibank N.A. [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	1,513,310
Net Amounts of Assets presented in the Statements of Financial Condition	1,513,310
Amounts of Recognized Assets presented in the Statements of Financial Condition		(1,464,982)
Financial Instruments for the Benefit of (the Funds) / the Counterparties		1,464,982
Net Amounts of Liabilities presented in the Statements of Financial Condition		0
ProShares Ultra Gold [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	969,501
Financial Instruments for the Benefit of (the Funds) / the Counterparties	(967,678)
Cash Collateral for the Benefit of (the Funds) / the Counterparties	(1,823)
Amounts of Recognized Assets presented in the Statements of Financial Condition		(1,112,916)
Financial Instruments for the Benefit of (the Funds) / the Counterparties		1,112,916
Net Amounts of Liabilities presented in the Statements of Financial Condition		0
ProShares Ultra Gold [Member] | Societe Generale S.A. [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	218,319
Net Amounts of Assets presented in the Statements of Financial Condition	218,319
Amounts of Recognized Assets presented in the Statements of Financial Condition		(643,587)
Financial Instruments for the Benefit of (the Funds) / the Counterparties		643,587
Net Amounts of Liabilities presented in the Statements of Financial Condition		0
ProShares Ultra Gold [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	945,225
Financial Instruments for the Benefit of (the Funds) / the Counterparties	(945,225)
Amounts of Recognized Assets presented in the Statements of Financial Condition		(1,209,622)
Financial Instruments for the Benefit of (the Funds) / the Counterparties		1,209,622
Net Amounts of Liabilities presented in the Statements of Financial Condition		0
ProShares Ultra Silver [Member] | Citibank N.A. [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	7,201,744
Net Amounts of Assets presented in the Statements of Financial Condition	7,201,744
Amounts of Recognized Assets presented in the Statements of Financial Condition		(6,946,009)
Financial Instruments for the Benefit of (the Funds) / the Counterparties		6,946,009
Net Amounts of Liabilities presented in the Statements of Financial Condition		0
ProShares Ultra Silver [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	5,873,080
Financial Instruments for the Benefit of (the Funds) / the Counterparties	(4,903,696)
Net Amounts of Assets presented in the Statements of Financial Condition	969,384
Amounts of Recognized Assets presented in the Statements of Financial Condition		(5,869,092)
Financial Instruments for the Benefit of (the Funds) / the Counterparties		5,869,092
Net Amounts of Liabilities presented in the Statements of Financial Condition		0
ProShares Ultra Silver [Member] | Societe Generale S.A. [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	2,761,817
Financial Instruments for the Benefit of (the Funds) / the Counterparties	(2,516,153)
Net Amounts of Assets presented in the Statements of Financial Condition	245,664
Amounts of Recognized Assets presented in the Statements of Financial Condition		(2,532,729)
Financial Instruments for the Benefit of (the Funds) / the Counterparties		2,532,729
Net Amounts of Liabilities presented in the Statements of Financial Condition		0
ProShares Ultra Silver [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	5,898,693
Financial Instruments for the Benefit of (the Funds) / the Counterparties	(4,930,596)
Net Amounts of Assets presented in the Statements of Financial Condition	968,097
Amounts of Recognized Assets presented in the Statements of Financial Condition		(5,628,359)
Financial Instruments for the Benefit of (the Funds) / the Counterparties		5,628,359
Net Amounts of Liabilities presented in the Statements of Financial Condition		0
ProShares UltraShort Bloomberg Crude Oil [Member] | Citibank N.A. [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	(10,173,164)	(4,742,191)
Financial Instruments for the Benefit of (the Funds) / the Counterparties	10,173,164	4,742,191
Net Amounts of Liabilities presented in the Statements of Financial Condition	0	0
ProShares UltraShort Bloomberg Crude Oil [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	(9,242,398)	(3,061,395)
Financial Instruments for the Benefit of (the Funds) / the Counterparties	9,242,398	3,061,395
Net Amounts of Liabilities presented in the Statements of Financial Condition	0	0
ProShares UltraShort Bloomberg Crude Oil [Member] | Societe Generale S.A. [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	(1,904,113)	(1,050,699)
Financial Instruments for the Benefit of (the Funds) / the Counterparties	1,904,113	1,050,699
Net Amounts of Liabilities presented in the Statements of Financial Condition	0	0
ProShares UltraShort Bloomberg Crude Oil [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	(9,287,467)	(3,352,596)
Financial Instruments for the Benefit of (the Funds) / the Counterparties	9,287,467	3,352,596
Net Amounts of Liabilities presented in the Statements of Financial Condition	0	0
ProShares UltraShort Euro [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition		8,109,067
Financial Instruments for the Benefit of (the Funds) / the Counterparties		(8,109,067)
Amounts of Recognized Assets presented in the Statements of Financial Condition	(3,297,612)
Financial Instruments for the Benefit of (the Funds) / the Counterparties	259,612
Cash Collateral for the Benefit of (the Funds) / the Counterparties	3,038,000
Net Amounts of Liabilities presented in the Statements of Financial Condition	0
ProShares UltraShort Euro [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition		8,053,864
Cash Collateral for the Benefit of (the Funds) / the Counterparties		(8,053,864)
Amounts of Recognized Assets presented in the Statements of Financial Condition	(3,046,657)
Financial Instruments for the Benefit of (the Funds) / the Counterparties	3,046,657
Net Amounts of Liabilities presented in the Statements of Financial Condition	0
ProShares UltraShort Gold [Member] | Citibank N.A. [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition		1,147,811
Net Amounts of Assets presented in the Statements of Financial Condition		1,147,811
Amounts of Recognized Assets presented in the Statements of Financial Condition	(554,559)
Financial Instruments for the Benefit of (the Funds) / the Counterparties	554,559
Net Amounts of Liabilities presented in the Statements of Financial Condition	0
ProShares UltraShort Gold [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition		881,454
Financial Instruments for the Benefit of (the Funds) / the Counterparties		(874,948)
Net Amounts of Assets presented in the Statements of Financial Condition		6,506
Amounts of Recognized Assets presented in the Statements of Financial Condition	(428,358)
Financial Instruments for the Benefit of (the Funds) / the Counterparties	428,358
Net Amounts of Liabilities presented in the Statements of Financial Condition	0
ProShares UltraShort Gold [Member] | Societe Generale S.A. [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition		393,006
Financial Instruments for the Benefit of (the Funds) / the Counterparties		(393,006)
Amounts of Recognized Assets presented in the Statements of Financial Condition	(126,928)
Financial Instruments for the Benefit of (the Funds) / the Counterparties	126,928
Net Amounts of Liabilities presented in the Statements of Financial Condition	0
ProShares UltraShort Gold [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition		611,295
Cash Collateral for the Benefit of (the Funds) / the Counterparties		(611,295)
Amounts of Recognized Assets presented in the Statements of Financial Condition	(378,414)
Financial Instruments for the Benefit of (the Funds) / the Counterparties	378,414
Net Amounts of Liabilities presented in the Statements of Financial Condition	0
ProShares UltraShort Silver [Member] | Citibank N.A. [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition		610,478
Net Amounts of Assets presented in the Statements of Financial Condition		610,478
Amounts of Recognized Assets presented in the Statements of Financial Condition	(632,593)
Financial Instruments for the Benefit of (the Funds) / the Counterparties	632,593
Net Amounts of Liabilities presented in the Statements of Financial Condition	0
ProShares UltraShort Silver [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition		323,829
Financial Instruments for the Benefit of (the Funds) / the Counterparties		(323,829)
Amounts of Recognized Assets presented in the Statements of Financial Condition	(486,240)
Cash Collateral for the Benefit of (the Funds) / the Counterparties	486,240
Net Amounts of Liabilities presented in the Statements of Financial Condition	0
ProShares UltraShort Silver [Member] | Societe Generale S.A. [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition		86,543
Financial Instruments for the Benefit of (the Funds) / the Counterparties		(86,543)
Amounts of Recognized Assets presented in the Statements of Financial Condition	(115,305)
Financial Instruments for the Benefit of (the Funds) / the Counterparties	115,305
Net Amounts of Liabilities presented in the Statements of Financial Condition	0
ProShares UltraShort Silver [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition		363,396
Cash Collateral for the Benefit of (the Funds) / the Counterparties		(363,396)
Amounts of Recognized Assets presented in the Statements of Financial Condition	(482,025)
Financial Instruments for the Benefit of (the Funds) / the Counterparties	482,025
Net Amounts of Liabilities presented in the Statements of Financial Condition	0
ProShares UltraShort Yen [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	821,317	8,256,779
Financial Instruments for the Benefit of (the Funds) / the Counterparties	(810,030)	(7,771,819)
Net Amounts of Assets presented in the Statements of Financial Condition	11,287	484,960
ProShares UltraShort Yen [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	705,946	8,488,158
Cash Collateral for the Benefit of (the Funds) / the Counterparties	(705,946)	(7,980,000)
Net Amounts of Assets presented in the Statements of Financial Condition		508,158
ProShares Ultra Yen [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	(17,410)	(219,736)
Financial Instruments for the Benefit of (the Funds) / the Counterparties	17,410	219,736
Net Amounts of Liabilities presented in the Statements of Financial Condition	0	0
ProShares Ultra Yen [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	(17,414)	(122,340)
Financial Instruments for the Benefit of (the Funds) / the Counterparties	17,414	122,340
Net Amounts of Liabilities presented in the Statements of Financial Condition	$ 0	$ 0

Agreements - Additional Informa

Agreements - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017USD ($)
Health Care Trust Fund [Line Items]
Management Fee paid to sponsor, percent per annum of the average daily NAV of each Geared Fund	0.95%
Ceiling for legal fees	$ 100,000
Percentage of annual NAV as limit to pay SEC registration fees incurred	0.021%
Ceiling for per annum K-1 preparation and mailing fees against annual net assets of Fund	0.10%
Leverage Fund [Member]
Health Care Trust Fund [Line Items]
Management Fee paid to sponsor, percent per annum of the average daily NAV of each Geared Fund	0.95%
Geared Vix Fund [Member]
Health Care Trust Fund [Line Items]
Management Fee paid to sponsor, percent per annum of the average daily NAV of each Geared Fund	0.95%
Short Euro Fund [Member]
Health Care Trust Fund [Line Items]
Management Fee paid to sponsor, percent per annum of the average daily NAV of each Geared Fund	0.95%
Volatility Index Fund [Member]
Health Care Trust Fund [Line Items]
Management Fee paid to sponsor, percent per annum of the average daily NAV of each Geared Fund	0.85%

Offering Costs - Additional Inf

Offering Costs - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Offering costs, amortization period	12 months
Reimbursement from sponsors, percentage of the average daily NAV	0.95%

Creation and Redemption of Cr43

Creation and Redemption of Creation Units - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017$ / EquityUnitshares
Creation And Redemption Of Creation Units [Line Items]
Creation Unit, block Shares of a Fund	50,000
Fixed transaction fee per Creation Unit, maximum | $ / EquityUnit	250
Variable transaction fee, percent of the value of the Creation Unit, maximum	0.10%
Volatility Index Fund [Member]
Creation And Redemption Of Creation Units [Line Items]
Creation Unit, block Shares of a Fund	25,000
Variable transaction fee, percent of the value of the Creation Unit, maximum	0.05%

Creation and Redemption of Cr44

Creation and Redemption of Creation Units - Schedule of Transaction Fees (Detail) - USD ($)		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Creation And Redemption Of Creation Units [Line Items]
Transaction fees	[1]	$ 3,138,503	$ 3,906,425	$ 3,193,283
ProShares Short VIX Short-Term Futures ETF [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees		1,008,452	801,564	342,734
ProShares Ultra Bloomberg Crude Oil [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees		610,969	504,533	847,422
ProShares Ultra Bloomberg Natural Gas [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees		15,937	9,175	13,939
ProShares Ultra Gold [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees		14,460	14,138	4,218
ProShares Ultra Silver [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees		28,622	47,414	38,848
ProShares Ultra VIX Short-Term Futures ETF [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees		1,036,162	1,822,247	1,391,292
Proshares Ultra Pro 3X Crude Oil ETF [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees		25,455
Pro Shares UltraPro 3X Short Crude Oil ETF [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees		14,096
ProShares UltraShort Bloomberg Crude Oil [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees		207,707	398,027	382,054
ProShares UltraShort Bloomberg Natural Gas [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees		4,713	8,989	8,853
ProShares UltraShort Gold [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees		15,945	29,854	11,024
ProShares UltraShort Silver [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees			16,729	39,354
ProShares VIX Mid-Term Futures ETF [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees		13,605	24,056	8,521
ProShares VIX Short-Term Futures ETF [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees		$ 142,380	$ 229,699	$ 105,024
[1]	Amounts exclude the activity of ProShares Ultra Australian Dollar which liquidated on June 29, 2015, ProShares Managed Futures Strategy which liquidated on March 30, 2016, ProShares UltraShort Bloomberg Commodity and ProShares Ultra Bloomberg Commodity which liquidated on September 1, 2016.

Financial Highlights - Per Shar

Financial Highlights - Per Share Operating Performance (Detail) - $ / shares		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
ProShares Short Euro [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance		$ 45.06		$ 43.78		$ 40.06
Net investment income (loss)		(0.14)		(0.33)		(0.40)
Net realized and unrealized gain (loss)	[1]	(4.96)		1.61		4.12
Change in net asset value from operations		(5.10)		1.28		3.72
Net asset value, ending balance		39.96		45.06		43.78
Market value per share, beginning balance	[2]	45.12		43.74		40.03
Market value per share, ending balance	[2]	$ 39.99		$ 45.12		$ 43.74
Total Return, at net asset value		(11.30%)		2.90%		9.30%
Total Return, at market value		(11.40%)		3.20%		9.30%
Ratios to Average Net Assets
Expense ratio		0.97%		0.97%		0.97%
Expense ratio, excluding brokerage commissions and fees		0.95%		0.95%		0.95%
Net investment income (loss)		(0.32%)		(0.76%)		(0.95%)
ProShares Short VIX Short-Term Futures ETF [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance	[3]	$ 45.62		$ 25.41		$ 30.70
Net investment income (loss)		(0.60)	[3]	(0.30)		(0.41)	[3]
Net realized and unrealized gain (loss)	[1]	82.28	[3]	20.51		(4.88)	[3]
Change in net asset value from operations		81.68	[3]	20.21		(5.29)	[3]
Net asset value, ending balance	[3]	127.30		45.62		25.41
Market value per share, beginning balance	[2],[3]	45.49		25.23		30.58
Market value per share, ending balance	[2],[3]	$ 128.21		$ 45.49		$ 25.23
Total Return, at net asset value		179.00%	[3]	79.50%		(17.20%)	[3]
Total Return, at market value		181.80%	[3]	80.30%		(17.50%)	[3]
Ratios to Average Net Assets
Expense ratio		1.51%	[3]	1.39%		1.40%	[3]
Expense ratio, excluding brokerage commissions and fees		0.95%	[3]	0.95%		0.95%	[3]
Net investment income (loss)		(0.71%)	[3]	(1.15%)		(1.36%)	[3]
ProShares Ultra Bloomberg Crude Oil [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance	[3]	$ 23.34		$ 25.15		$ 101.48
Net investment income (loss)		(0.03)		(0.15)	[3]	(0.56)	[3]
Net realized and unrealized gain (loss)	[1]	0.35		(1.66)	[3]	(75.77)	[3]
Change in net asset value from operations		0.32		(1.81)	[3]	(76.33)	[3]
Net asset value, ending balance		23.66		23.34	[3]	25.15	[3]
Market value per share, beginning balance	[2],[3]	23.36		25.08		103.70
Market value per share, ending balance	[2]	$ 23.44		$ 23.36	[3]	$ 25.08	[3]
Total Return, at net asset value		1.40%		(7.20%)	[3]	(75.20%)	[3]
Total Return, at market value		0.30%		(6.90%)	[3]	(75.80%)	[3]
Ratios to Average Net Assets
Expense ratio		0.98%		1.01%	[3]	1.02%	[3]
Expense ratio, excluding brokerage commissions and fees		0.95%		0.95%	[3]	0.95%	[3]
Net investment income (loss)		(0.18%)		(0.76%)	[3]	(0.98%)	[3]
ProShares Ultra Bloomberg Natural Gas [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance		$ 18.85		$ 18.57	[3]	$ 61.65	[3]
Net investment income (loss)		(0.05)		(0.16)		(0.50)	[3]
Net realized and unrealized gain (loss)	[1]	(12.27)		0.44		(42.58)	[3]
Change in net asset value from operations		(12.32)		0.28		(43.08)	[3]
Net asset value, ending balance		6.53		18.85		18.57	[3]
Market value per share, beginning balance	[2]	18.96		18.48	[3]	63.12	[3]
Market value per share, ending balance	[2]	$ 6.50		$ 18.96		$ 18.48	[3]
Total Return, at net asset value		(65.40%)		1.50%		(69.90%)	[3]
Total Return, at market value		(65.70%)		2.60%		(70.70%)	[3]
Ratios to Average Net Assets
Expense ratio		1.22%		1.34%		1.29%	[3]
Expense ratio, excluding brokerage commissions and fees		0.95%		0.95%		0.95%	[3]
Net investment income (loss)		(0.50%)		(1.12%)		(1.26%)	[3]
ProShares Ultra Euro [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance		$ 14.02		$ 15.51		$ 19.87
Net investment income (loss)		(0.04)		(0.11)		(0.15)
Net realized and unrealized gain (loss)	[1]	3.46		(1.38)		(4.21)
Change in net asset value from operations		3.42		(1.49)		(4.36)
Net asset value, ending balance		17.44		14.02		15.51
Market value per share, beginning balance	[2]	14.09		15.51		19.80
Market value per share, ending balance	[2]	$ 17.46		$ 14.09		$ 15.51
Total Return, at net asset value		24.40%		(9.60%)		(22.00%)
Total Return, at market value		23.90%		(9.20%)		(21.70%)
Ratios to Average Net Assets
Expense ratio		0.95%		0.95%		0.95%
Expense ratio, excluding brokerage commissions and fees		0.95%		0.95%		0.95%
Net investment income (loss)		(0.23%)		(0.71%)		(0.93%)
ProShares Ultra Gold [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance		$ 32.90		$ 29.73		$ 40
Net investment income (loss)		(0.06)		(0.28)		(0.33)
Net realized and unrealized gain (loss)	[1]	7.04		3.45		(9.94)
Change in net asset value from operations		6.98		3.17		(10.27)
Net asset value, ending balance		39.88		32.90		29.73
Market value per share, beginning balance	[2]	33.20		29.73		38.41
Market value per share, ending balance	[2]	$ 40.67		$ 33.20		$ 29.73
Total Return, at net asset value		21.20%		10.70%		(25.70%)
Total Return, at market value		22.50%		11.70%		(22.60%)
Ratios to Average Net Assets
Expense ratio		0.95%		0.95%		0.95%
Expense ratio, excluding brokerage commissions and fees		0.95%		0.95%		0.95%
Net investment income (loss)		(0.14%)		(0.69%)		(0.90%)
ProShares Ultra Silver [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance		$ 33.44		$ 27.06		$ 39.37
Net investment income (loss)		(0.05)		(0.27)		(0.33)
Net realized and unrealized gain (loss)		0.16	[1]	6.65	[1]	(11.98)	[4]
Change in net asset value from operations		0.11		6.38		(12.31)
Net asset value, ending balance		33.55		33.44		27.06
Market value per share, beginning balance	[2]	32.09	[5]	27.07		38.05
Market value per share, ending balance		$ 33.85	[5]	$ 32.09	[2],[5]	$ 27.07	[2]
Total Return, at net asset value		0.30%		23.60%		(31.30%)
Total Return, at market value		5.50%		18.50%		(28.80%)
Ratios to Average Net Assets
Expense ratio		0.95%		0.95%		0.95%
Expense ratio, excluding brokerage commissions and fees		0.95%		0.95%		0.95%
Net investment income (loss)		(0.15%)		(0.69%)		(0.89%)
ProShares Ultra VIX Short-Term Futures ETF [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance	[3]	$ 173.93		$ 2,808.40		$ 12,546
Net investment income (loss)	[3]	(0.33)		(7.68)		(72.24)
Net realized and unrealized gain (loss)	[3]	(163.27)	[1]	(2,626.79)	[1]	(9,665.36)	[4]
Change in net asset value from operations	[3]	(163.60)		(2,634.47)		(9,737.60)
Net asset value, ending balance	[3]	10.33		173.93		2,808.40
Market value per share, beginning balance	[2],[3]	175	[5]	2,835		12,575
Market value per share, ending balance	[3]	$ 10.21	[5]	$ 175	[2],[5]	$ 2,835	[2]
Total Return, at net asset value	[3]	(94.10%)		(93.80%)		(77.60%)
Total Return, at market value	[3]	(94.20%)		(93.80%)		(77.50%)
Ratios to Average Net Assets
Expense ratio	[3]	1.90%		1.57%		1.65%
Expense ratio, excluding brokerage commissions and fees	[3]	0.95%		0.85%		0.95%
Net investment income (loss)	[3]	(1.17%)		(1.32%)		(1.61%)
ProShares Ultra Yen [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance		$ 55.43		$ 54.75	[3]	$ 56.47	[3]
Net investment income (loss)		(0.24)		(0.45)		(0.48)	[3]
Net realized and unrealized gain (loss)		2.13	[1]	1.13	[1]	(1.24)	[3],[4]
Change in net asset value from operations		1.89		0.68		(1.72)	[3]
Net asset value, ending balance		57.32		55.43		54.75	[3]
Market value per share, beginning balance	[2]	55.52	[5]	54.70	[3]	56.48	[3]
Market value per share, ending balance		$ 57.45	[5]	$ 55.52	[2],[5]	$ 54.70	[2],[3]
Total Return, at net asset value		3.40%		1.20%		(3.00%)	[3]
Total Return, at market value		3.50%		1.50%		(3.20%)	[3]
Ratios to Average Net Assets
Expense ratio		0.95%		0.95%		0.95%	[3]
Expense ratio, excluding brokerage commissions and fees		0.95%		0.95%		0.95%	[3]
Net investment income (loss)		(0.41%)		(0.69%)		(0.88%)	[3]
ProShares UltraShort Australian Dollar [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance		$ 55.38		$ 58.46		$ 51.38
Net investment income (loss)		(0.17)		(0.43)		(0.57)
Net realized and unrealized gain (loss)		(9.54)	[1]	(2.65)	[1]	7.65	[4]
Change in net asset value from operations		(9.71)		(3.08)		7.08
Net asset value, ending balance		45.67		55.38		58.46
Market value per share, beginning balance	[2]	55.24	[5]	58.15		51.37
Market value per share, ending balance		$ 45.72	[5]	$ 55.24	[2],[5]	$ 58.15	[2]
Total Return, at net asset value		(17.50%)		(5.30%)		13.80%
Total Return, at market value		(17.20%)		(5.00%)		13.20%
Ratios to Average Net Assets
Expense ratio		1.02%		1.03%		1.03%
Expense ratio, excluding brokerage commissions and fees		0.95%		0.95%		0.95%
Net investment income (loss)		(0.36%)		(0.79%)		(1.00%)
ProShares UltraShort Bloomberg Crude Oil [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance	[3]	$ 31.70		$ 66.60		$ 38.99
Net investment income (loss)		(0.06)		(0.36)	[3]	(0.39)	[3]
Net realized and unrealized gain (loss)		(7.33)	[1]	(34.54)	[1],[3]	28	[3],[4]
Change in net asset value from operations		(7.39)		(34.90)	[3]	27.61	[3]
Net asset value, ending balance		24.31		31.70	[3]	66.60	[3]
Market value per share, beginning balance	[2],[3]	31.65		66.82		38.26
Market value per share, ending balance	[2]	$ 24.56		$ 31.65	[3]	$ 66.82	[3]
Total Return, at net asset value		(23.30%)		(52.40%)	[3]	70.80%	[3]
Total Return, at market value		(22.40%)		(52.60%)	[3]	74.60%	[3]
Ratios to Average Net Assets
Expense ratio		0.99%		1.03%	[3]	1.07%	[3]
Expense ratio, excluding brokerage commissions and fees		0.95%		0.95%	[3]	0.95%	[3]
Net investment income (loss)		(0.17%)		(0.76%)	[3]	(1.04%)	[3]
ProShares UltraShort Bloomberg Natural Gas [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance	[3]	$ 23.10		$ 46.53		$ 27.99
Net investment income (loss)		(0.27)		(0.68)	[3]	(0.44)	[3]
Net realized and unrealized gain (loss)		16.65	[1]	(22.75)	[1],[3]	18.98	[3],[4]
Change in net asset value from operations		16.38		(23.43)	[3]	18.54	[3]
Net asset value, ending balance		39.48		23.10	[3]	46.53	[3]
Market value per share, beginning balance	[2],[3]	23.05		46.53		27.34
Market value per share, ending balance	[2]	$ 39.65		$ 23.05	[3]	$ 46.53	[3]
Total Return, at net asset value		70.90%		(50.40%)	[3]	66.30%	[3]
Total Return, at market value		72.00%		(50.50%)	[3]	70.30%	[3]
Ratios to Average Net Assets
Expense ratio		1.39%		1.65%	[3]	1.55%	[3]
Expense ratio, excluding brokerage commissions and fees		0.95%		0.95%	[3]	0.95%	[3]
Net investment income (loss)		(0.81%)		(1.43%)	[3]	(1.50%)	[3]
Proshares Ultra Pro 3X Crude Oil ETF [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance	[6]	$ 25
Net investment income (loss)	[6]	(0.21)
Net realized and unrealized gain (loss)	[1],[6]	12.99
Change in net asset value from operations	[6]	12.78
Net asset value, ending balance	[6]	37.78		$ 25
Market value per share, beginning balance	[5],[6]	25
Market value per share, ending balance	[5],[6]	$ 37.23		25
Total Return, at net asset value	[6],[7]	51.10%
Total Return, at market value	[6],[7]	48.90%
Ratios to Average Net Assets
Expense ratio	[6],[8]	1.30%
Expense ratio, excluding brokerage commissions and fees	[6],[8]	0.95%
Net investment income (loss)	[6],[8]	(1.20%)
Pro Shares UltraPro 3X Short Crude Oil ETF [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance	[6]	$ 25
Net investment income (loss)	[6]	(0.17)
Net realized and unrealized gain (loss)	[1],[6]	(14.25)
Change in net asset value from operations	[6]	(14.42)
Net asset value, ending balance	[6]	10.58	[9]	25
Market value per share, beginning balance	[5],[6]	25
Market value per share, ending balance	[5],[6]	$ 10.72	[9]	25
Total Return, at net asset value	[6],[7]	(57.70%)
Total Return, at market value	[6],[7]	(57.10%)
Ratios to Average Net Assets
Expense ratio	[6],[8]	1.32%
Expense ratio, excluding brokerage commissions and fees	[6],[8]	0.95%
Net investment income (loss)	[6],[8]	(1.25%)
ProShares UltraShort Euro [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance		$ 27.08		25.54		$ 21.59
Net investment income (loss)		(0.04)		(0.17)		(0.22)
Net realized and unrealized gain (loss)	[1]	(5.83)		1.71		4.17
Change in net asset value from operations		(5.87)		1.54		3.95
Net asset value, ending balance		21.21		27.08		25.54
Market value per share, beginning balance	[2]	27.08		25.53		21.61
Market value per share, ending balance	[2]	$ 21.20		$ 27.08		$ 25.53
Total Return, at net asset value		(21.70%)		6.00%		18.30%
Total Return, at market value		(21.70%)		6.10%		18.10%
Ratios to Average Net Assets
Expense ratio		0.95%		0.95%		0.95%
Expense ratio, excluding brokerage commissions and fees		0.95%		0.95%		0.95%
Net investment income (loss)		(0.15%)		(0.70%)		(0.90%)
ProShares UltraShort Gold [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance		$ 91.33		$ 115.88		$ 96.65
Net investment income (loss)		(0.13)		(0.55)		(0.91)
Net realized and unrealized gain (loss)	[1]	(20.73)		(24)		20.14
Change in net asset value from operations		(20.86)		(24.55)		19.23
Net asset value, ending balance		70.47		91.33		115.88
Market value per share, beginning balance	[2]	90.54		115.83		100.22
Market value per share, ending balance	[2]	$ 69.11		$ 90.54		$ 115.83
Total Return, at net asset value		(22.80%)		(21.20%)		19.90%
Total Return, at market value		(23.70%)		(21.80%)		15.60%
Ratios to Average Net Assets
Expense ratio		0.95%		0.95%		0.95%
Expense ratio, excluding brokerage commissions and fees		0.95%		0.95%		0.95%
Net investment income (loss)		(0.17%)		(0.70%)		(0.91%)
ProShares UltraShort Silver [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance		$ 37.31		$ 64.58	[3]	$ 57.81	[3]
Net investment income (loss)		(0.06)		(0.26)		(0.50)	[3]
Net realized and unrealized gain (loss)	[1]	(5.54)		(27.01)		7.27	[3]
Change in net asset value from operations		(5.60)		(27.27)		6.77	[3]
Net asset value, ending balance		31.71		37.31		64.58	[3]
Market value per share, beginning balance	[2]	38.76		64.55	[3]	59.70	[3]
Market value per share, ending balance	[2]	$ 31.40		$ 38.76		$ 64.55	[3]
Total Return, at net asset value		(15.00%)		(42.20%)		11.70%	[3]
Total Return, at market value		(19.00%)		(40.00%)		8.10%	[3]
Ratios to Average Net Assets
Expense ratio		0.95%		0.95%		0.95%	[3]
Expense ratio, excluding brokerage commissions and fees		0.95%		0.95%		0.95%	[3]
Net investment income (loss)		(0.18%)		(0.70%)		(0.91%)	[3]
ProShares UltraShort Yen [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance		$ 80.24		$ 87.94		$ 89.33
Net investment income (loss)		(0.14)		(0.50)		(0.82)
Net realized and unrealized gain (loss)	[1]	(5.17)		(7.20)		(0.57)
Change in net asset value from operations		(5.31)		(7.70)		(1.39)
Net asset value, ending balance		74.93		80.24		87.94
Market value per share, beginning balance	[2]	80.25		87.89		89.30
Market value per share, ending balance	[2]	$ 74.98		$ 80.25		$ 87.89
Total Return, at net asset value		(6.60%)		(8.80%)		(1.60%)
Total Return, at market value		(6.60%)		(8.70%)		(1.60%)
Ratios to Average Net Assets
Expense ratio		0.95%		0.95%		0.95%
Expense ratio, excluding brokerage commissions and fees		0.95%		0.95%		0.95%
Net investment income (loss)		(0.19%)		(0.71%)		(0.92%)
ProShares VIX Mid-Term Futures ETF [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance		$ 42.14		$ 53.96		$ 63.60
Net investment income (loss)		(0.06)		(0.33)		(0.51)
Net realized and unrealized gain (loss)	[1]	(20.79)		(11.49)		(9.13)
Change in net asset value from operations		(20.85)		(11.82)		(9.64)
Net asset value, ending balance		21.29		42.14		53.96
Market value per share, beginning balance	[2]	42.34		53.99		63.89
Market value per share, ending balance	[2]	$ 21.15		$ 42.34		$ 53.99
Total Return, at net asset value		(49.50%)		(21.90%)		(15.20%)
Total Return, at market value		(50.00%)		(21.60%)		(15.50%)
Ratios to Average Net Assets
Expense ratio		0.91%		0.93%		0.85%
Expense ratio, excluding brokerage commissions and fees		0.85%		0.85%		0.85%
Net investment income (loss)		(0.22%)		(0.68%)		(0.88%)
ProShares VIX Short-Term Futures ETF [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance	[3]	$ 84.86		$ 264.84		$ 418.64
Net investment income (loss)	[3]	(0.07)		(1.10)		(2.65)
Net realized and unrealized gain (loss)	[1],[3]	(61.45)		(178.88)		(151.15)
Change in net asset value from operations	[3]	(61.52)		(179.98)		(153.80)
Net asset value, ending balance	[3]	23.34		84.86		264.84
Market value per share, beginning balance	[2],[3]	85.04		266.60		419.80
Market value per share, ending balance	[2],[3]	$ 23.15		$ 85.04		$ 266.60
Total Return, at net asset value	[3]	(72.50%)		(68.00%)		(36.70%)
Total Return, at market value	[3]	(72.80%)		(68.10%)		(36.50%)
Ratios to Average Net Assets
Expense ratio	[3]	0.96%		0.99%		0.85%
Expense ratio, excluding brokerage commissions and fees	[3]	0.85%		0.85%		0.85%
Net investment income (loss)	[3]	(0.18%)		(0.75%)		(0.92%)
[1]	The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period.
[2]	Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds' net asset value is calculated.
[3]	See Note 1 of these Notes to Financial Statements.
[4]	Percentages The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period.
[5]	Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds' net asset value is calculated. For ProShares UltraPro 3x Crude Oil ETF and ProShares UltraPro 3x Short Crude Oil ETF, the returns of shares outstanding for the period from commencement of operations through December 31, 2017 are calculated based on the initial offering price upon commencement of operations of $25.00.
[6]	From commencement of operations, March 24, 2017 through December 31, 2017.
[7]	Percentages are not annualized for the period ended December 31, 2017.
[8]	Percentages are annualized.
[9]	Since the Fund's inception date was January 13, 2017, the Statement of Financial Condition as of December 31, 2016 has not been provided.

Financial Highlights - Per Sh46

Financial Highlights - Per Share Operating Performance (Parenthetical) (Detail)	Dec. 31, 2017$ / shares
Proshares Ultra Pro 3X Crude Oil ETF [Member]
Investment Company, Financial Highlights [Line Items]
Returns for a share outstanding	$ 25
Pro Shares UltraPro 3X Short Crude Oil ETF [Member]
Investment Company, Financial Highlights [Line Items]
Returns for a share outstanding	$ 25

Risk - Additional Information (

Risk - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017	Oct. 31, 2017
Unusual Risk or Uncertainty [Line Items]
Percentage of calculation on simple inverse correlation	200.00%
Forward Agreements [Member]
Unusual Risk or Uncertainty [Line Items]
Exposure to swap agreements or forward contracts	100.00%
Ultrashort Fund [Member]
Unusual Risk or Uncertainty [Line Items]
Leverage risk benchmark		50% at any point in the day
UltraPro Fund and UltraPro Short Fund [Member]
Unusual Risk or Uncertainty [Line Items]
Leverage risk benchmark		33% at any point in the day

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017
ProShares Ultra VIX Short-Term Futures ETF [Member]
Subsequent Event [Line Items]
Description of change in investment objective	ProShares Ultra VIX Short-Term Futures ETF (NYSE Arca: UVXY) changed its investment objective to seek results (before fees and expenses) that correspond to one and one-half times (1.5x) the performance of the S&P 500 VIX Short-Term Futures Index (“Index”) for a single day. Previously, the Fund’s investment objective was to seek results (before fees and expenses) that correspond to two times (2x) the performance of the Index for a single day.
ProShares Short VIX Short-Term Futures ETF [Member]
Subsequent Event [Line Items]
Description of change in investment objective	ProShares Short VIX Short-Term Futures ETF (NYSE Arca: SVXY) changed its investment objective to seek results (before fees and expenses) that correspond to one-half the inverse (-0.5x) of the Index for a single day. Previously, the Fund’s investment objective was to seek results (before fees and expenses) that correspond to the inverse (-1x) of the Index for a single day.