ProShares Ultra Gold (UGL) 10-K 1 Mar 19 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2018	Feb. 26, 2019	Jun. 30, 2018
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2,018
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 Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
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			8,306,000
ProShares Short VIX Short-Term Futures ETF [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		8,384,307
Entity Public Float			525,972,000
ProShares Ultra Bloomberg Crude Oil [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		22,561,317
Entity Public Float			455,924,078
ProShares Ultra Bloomberg Natural Gas [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		1,428,150
Entity Public Float			25,703,451
ProShares Ultra Euro [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		550,000
Entity Public Float			8,833,000
ProShares Ultra Gold [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		2,300,000
Entity Public Float			82,260,000
ProShares Ultra Silver [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		7,346,526
Entity Public Float			210,482,961
ProShares Ultra VIX Short-Term Futures ETF [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		10,880,912
Entity Public Float			361,898,117
ProShares Ultra Yen [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		99,970
Entity Public Float			2,914,750
Proshares UltraPro 3x Crude Oil ETF [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		5,650,000
Entity Public Float			40,963,000
ProShares UltraPro 3X Short Crude Oil ETF [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		724,906
Entity Public Float			21,676,939
ProShares UltraShort Australian Dollar [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		150,000
Entity Public Float			7,680,000
ProShares UltraShort Bloomberg Crude Oil [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		3,489,884
Entity Public Float			177,278,170
ProShares UltraShort Bloomberg Natural Gas [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		524,832
Entity Public Float			6,752,012
ProShares UltraShort Euro [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		5,650,000
Entity Public Float			177,762,000
ProShares UltraShort Gold [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		296,977
Entity Public Float			26,158,671
ProShares UltraShort Silver [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		416,976
Entity Public Float			22,943,974
ProShares UltraShort Yen [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		699,290
Entity Public Float			84,403,858
ProShares VIX Mid-Term Futures ETF [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		2,187,403
Entity Public Float			19,852,517
ProShares VIX Short-Term Futures ETF [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		6,576,317
Entity Public Float			$ 114,490,195

Statements of Financial Conditi

Statements of Financial Condition - USD ($)		Dec. 31, 2018	Dec. 31, 2017
Assets
Cash		$ 729,259,407	$ 55,713,112
Receivable from capital shares sold		54,572,979	843,370
Receivable on open futures contracts		79,899,070	45,230,982
Interest receivable		555,187
Offering costs (Note 5)			105,643
Limitation by Sponsor			59,651
Total assets		2,071,016,481	3,065,752,222
Liabilities
Payable for capital shares redeemed		11,136,094	73,270,557
Payable on open futures contracts		32,074,054	1,954,640
Payable to Sponsor		1,541,554	2,509,663
Total liabilities		127,041,456	118,474,010
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity		1,943,975,025	2,947,278,212	[1]
Total liabilities and shareholders' equity		$ 2,071,016,481	$ 3,065,752,222
Shares outstanding		75,842,768	74,000,885
U.S. Government Agencies Short-term Debt Securities [Member]
Assets
Short-term U.S. government and agency obligations (Note 3)		$ 785,085,860	$ 2,445,779,873
Futures Contracts [Member]
Assets
Segregated cash balances		272,501,850	420,018,133
Swap Agreements [Member]
Assets
Segregated cash balances		53,486,000
Unrealized appreciation		20,646,726	62,238,361
Liabilities
Unrealized depreciation		74,098,074	30,607,142
Forward Agreements [Member]
Assets
Segregated cash balances		37,374,000	4,081,500
Unrealized appreciation		30,555,018	25,381,689
Liabilities
Unrealized depreciation		2,783,797	3,204,422
Foreign Currency Forward Contracts [Member]
Assets
Segregated cash balances		6,057,000	3,960,000
Unrealized appreciation		1,023,384	2,339,908
Liabilities
Unrealized depreciation		5,407,883	6,927,586
ProShares Short Euro [Member]
Assets
Cash		7,873,056	923,063
Interest receivable		7,641
Total assets		8,631,926	8,041,728
Liabilities
Payable on open futures contracts		5,250	43,311
Payable to Sponsor		6,990	6,537
Total liabilities		12,240	49,848
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity		8,619,686	7,991,880
Total liabilities and shareholders' equity		$ 8,631,926	$ 8,041,728
Shares outstanding		200,000	200,000
Net asset value per share		$ 43.10	$ 39.96
Market value per share		$ 43.08	$ 39.99
ProShares Short Euro [Member] | U.S. Government Agencies Short-term Debt Securities [Member]
Assets
Short-term U.S. government and agency obligations (Note 3)		$ 599,429	$ 6,996,235
ProShares Short Euro [Member] | Futures Contracts [Member]
Assets
Segregated cash balances		151,800	122,430
ProShares Ultra Bloomberg Crude Oil [Member]
Assets
Cash		123,257,905	1,532,748
Receivable from capital shares sold		12,991,664
Receivable on open futures contracts		190,440	2,242,001
Interest receivable		62,514
Total assets		441,765,830	534,325,767
Liabilities
Payable for capital shares redeemed			9,464,420
Payable on open futures contracts		311,815
Payable to Sponsor		287,236	415,821
Total liabilities		73,366,176	9,880,241
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity		368,399,654	524,445,526
Total liabilities and shareholders' equity		$ 441,765,830	$ 534,325,767
Shares outstanding		28,211,317	22,161,317
Net asset value per share		$ 13.06	$ 23.66
Market value per share		$ 13.30	$ 23.44
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Government Agencies Short-term Debt Securities [Member]
Assets
Short-term U.S. government and agency obligations (Note 3)		$ 280,502,900	$ 459,515,902
ProShares Ultra Bloomberg Crude Oil [Member] | Futures Contracts [Member]
Assets
Segregated cash balances		13,563,407	8,796,755
ProShares Ultra Bloomberg Crude Oil [Member] | Swap Agreements [Member]
Assets
Segregated cash balances		11,197,000
Unrealized appreciation			62,238,361
Liabilities
Unrealized depreciation		72,767,125
ProShares Ultra VIX Short-Term Futures ETF [Member]
Assets
Cash		104,967,557	1,539,237
Receivable from capital shares sold		8,149,949	516,930
Receivable on open futures contracts		11,407,017	17,578,451
Interest receivable		106,307
Total assets		222,583,868	394,379,433
Liabilities
Payable for capital shares redeemed		6,745,146
Payable to Sponsor		202,902	344,292
Total liabilities		8,278,997	344,292
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity		214,304,871	394,035,141
Total liabilities and shareholders' equity		$ 222,583,868	$ 394,379,433
Shares outstanding		2,630,912	7,625,448
Net asset value per share	[2]	$ 81.46	$ 51.67
Market value per share		$ 81.73	$ 51.05
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Government Agencies Short-term Debt Securities [Member]
Assets
Short-term U.S. government and agency obligations (Note 3)			$ 287,533,132
ProShares Ultra VIX Short-Term Futures ETF [Member] | Futures Contracts [Member]
Assets
Segregated cash balances		$ 70,020,038	87,211,683
ProShares Ultra VIX Short-Term Futures ETF [Member] | Swap Agreements [Member]
Assets
Segregated cash balances		27,933,000
Liabilities
Unrealized depreciation		1,330,949
Proshares UltraPro 3x Crude Oil ETF [Member]
Assets
Cash		38,690,241	9,683,852
Receivable from capital shares sold		2,597,148
Receivable on open futures contracts		551,842	289,395
Interest receivable		17,308
Offering costs (Note 5)			52,846
Limitation by Sponsor			24,342
Total assets		87,728,540	11,335,483
Liabilities
Payable to Sponsor		61,498
Total liabilities		61,498
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity		87,667,042	11,335,483	[3]
Total liabilities and shareholders' equity		$ 87,728,540	$ 11,335,483
Shares outstanding		6,700,000	300,008
Net asset value per share		$ 13.08	$ 37.78	[4]
Market value per share		$ 13.47	$ 37.23
Proshares UltraPro 3x Crude Oil ETF [Member] | U.S. Government Agencies Short-term Debt Securities [Member]
Assets
Short-term U.S. government and agency obligations (Note 3)		$ 20,979,876
Proshares UltraPro 3x Crude Oil ETF [Member] | Futures Contracts [Member]
Assets
Segregated cash balances		24,892,125	$ 1,285,048
ProShares UltraShort Gold [Member]
Assets
Cash		12,563,184	1,026,645
Receivable on open futures contracts		1,700
Interest receivable		10,500
Total assets		19,105,095	33,013,345
Liabilities
Payable on open futures contracts			2,420
Payable to Sponsor		15,312	25,256
Total liabilities		1,006,098	1,515,935
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity		18,098,997	31,497,410
Total liabilities and shareholders' equity		$ 19,105,095	$ 33,013,345
Shares outstanding		246,978	446,978
Net asset value per share		$ 73.28	$ 70.47
Market value per share		$ 72.84	$ 69.11
ProShares UltraShort Gold [Member] | U.S. Government Agencies Short-term Debt Securities [Member]
Assets
Short-term U.S. government and agency obligations (Note 3)		$ 3,989,563	$ 31,977,900
ProShares UltraShort Gold [Member] | Futures Contracts [Member]
Assets
Segregated cash balances		38,148	8,800
ProShares UltraShort Gold [Member] | Forward Agreements [Member]
Assets
Segregated cash balances		2,502,000
Liabilities
Unrealized depreciation		990,786	1,488,259
ProShares VIX Mid-Term Futures ETF [Member]
Assets
Cash		48,860,400	1,639,958
Receivable on open futures contracts			170,015
Interest receivable		29,104
Total assets		57,571,528	27,429,888
Liabilities
Payable for capital shares redeemed		674,832	1,058,309
Payable on open futures contracts		565,495
Payable to Sponsor		32,080	23,631
Total liabilities		1,272,407	1,081,940
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity		56,299,121	26,347,948
Total liabilities and shareholders' equity		$ 57,571,528	$ 27,429,888
Shares outstanding		2,112,403	1,237,403
Net asset value per share		$ 26.65	$ 21.29
Market value per share		$ 26.74	$ 21.15
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Government Agencies Short-term Debt Securities [Member]
Assets
Short-term U.S. government and agency obligations (Note 3)			$ 20,993,515
ProShares VIX Mid-Term Futures ETF [Member] | Futures Contracts [Member]
Assets
Segregated cash balances		$ 8,682,024	4,626,400
ProShares Short VIX Short-Term Futures ETF [Member]
Assets
Cash		180,835,767	1,468,000
Receivable on open futures contracts		63,300,889	20,758,850
Interest receivable		142,222
Total assets		360,341,566	816,337,770
Liabilities
Payable for capital shares redeemed			44,817,710
Payable on open futures contracts		15,448,037	528,750
Payable to Sponsor		297,266	827,439
Total liabilities		15,745,303	46,173,899
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity		344,596,263	770,163,871
Total liabilities and shareholders' equity		$ 360,341,566	$ 816,337,770
Shares outstanding		8,134,307	1,512,500
Net asset value per share	[2]	$ 42.36	$ 509.20
Market value per share		$ 42.30	$ 512.84
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Government Agencies Short-term Debt Securities [Member]
Assets
Short-term U.S. government and agency obligations (Note 3)			$ 494,910,644
ProShares Short VIX Short-Term Futures ETF [Member] | Futures Contracts [Member]
Assets
Segregated cash balances		$ 116,062,688	299,200,276
ProShares Ultra Bloomberg Natural Gas [Member]
Assets
Cash		731,158	4,417,324
Receivable from capital shares sold		2,528,757	326,440
Receivable on open futures contracts			1,520,156
Interest receivable		11,508
Total assets		17,951,294	67,524,849
Liabilities
Payable for capital shares redeemed			4,211,794
Payable on open futures contracts		3,309,741
Payable to Sponsor		24,113	44,105
Total liabilities		3,333,854	4,255,899
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity		14,617,440	63,268,950
Total liabilities and shareholders' equity		$ 17,951,294	$ 67,524,849
Shares outstanding		578,150	1,938,434
Net asset value per share	[2]	$ 25.28	$ 32.64
Market value per share		$ 25.82	$ 32.50
ProShares Ultra Bloomberg Natural Gas [Member] | U.S. Government Agencies Short-term Debt Securities [Member]
Assets
Short-term U.S. government and agency obligations (Note 3)		$ 8,380,427	$ 50,961,356
ProShares Ultra Bloomberg Natural Gas [Member] | Futures Contracts [Member]
Assets
Segregated cash balances		6,299,444	10,299,573
ProShares Ultra Euro [Member]
Assets
Cash		5,068,270	1,416,427
Interest receivable		6,718
Total assets		7,554,617	9,656,271
Liabilities
Payable to Sponsor		6,015	7,298
Total liabilities		10,048	64,755
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity		7,544,569	9,591,516
Total liabilities and shareholders' equity		$ 7,554,617	$ 9,656,271
Shares outstanding		500,000	550,000
Net asset value per share		$ 15.09	$ 17.44
Market value per share		$ 15.12	$ 17.46
ProShares Ultra Euro [Member] | U.S. Government Agencies Short-term Debt Securities [Member]
Assets
Short-term U.S. government and agency obligations (Note 3)		$ 1,496,658	$ 6,996,235
ProShares Ultra Euro [Member] | Foreign Currency Forward Contracts [Member]
Assets
Segregated cash balances		921,000	922,000
Unrealized appreciation		61,971	321,609
Liabilities
Unrealized depreciation		4,033	57,457
ProShares Ultra Gold [Member]
Assets
Cash		32,035,747	1,237,103
Receivable on open futures contracts			2,420
Interest receivable		15,303
Total assets		87,308,381	93,779,522
Liabilities
Payable for capital shares redeemed		3,712,654
Payable on open futures contracts		7,990
Payable to Sponsor		64,443	70,774
Total liabilities		3,785,087	70,774
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity		83,523,294	93,708,748
Total liabilities and shareholders' equity		$ 87,308,381	$ 93,779,522
Shares outstanding		2,250,000	2,350,000
Net asset value per share		$ 37.12	$ 39.88
Market value per share		$ 37.41	$ 40.67
ProShares Ultra Gold [Member] | U.S. Government Agencies Short-term Debt Securities [Member]
Assets
Short-term U.S. government and agency obligations (Note 3)		$ 41,941,734	$ 88,884,844
ProShares Ultra Gold [Member] | Futures Contracts [Member]
Assets
Segregated cash balances		179,296	8,800
ProShares Ultra Gold [Member] | Forward Agreements [Member]
Assets
Segregated cash balances		8,883,000
Unrealized appreciation		4,253,301	3,646,355
ProShares Ultra Silver [Member]
Assets
Cash		29,951,685	1,113,594
Receivable on open futures contracts			2,220
Interest receivable		16,306
Total assets		202,021,571	261,786,204
Liabilities
Payable for capital shares redeemed			3,354,851
Payable on open futures contracts		47,576
Payable to Sponsor		149,619	186,657
Total liabilities		197,195	3,541,508
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity		201,824,376	258,244,696
Total liabilities and shareholders' equity		$ 202,021,571	$ 261,786,204
Shares outstanding		7,646,526	7,696,526
Net asset value per share		$ 26.39	$ 33.55
Market value per share		$ 26.37	$ 33.85
ProShares Ultra Silver [Member] | U.S. Government Agencies Short-term Debt Securities [Member]
Assets
Short-term U.S. government and agency obligations (Note 3)		$ 123,795,806	$ 235,581,716
ProShares Ultra Silver [Member] | Futures Contracts [Member]
Assets
Segregated cash balances		521,057	10,340
ProShares Ultra Silver [Member] | Forward Agreements [Member]
Assets
Segregated cash balances		21,435,000	3,343,000
Unrealized appreciation		26,301,717	21,735,334
ProShares Ultra Yen [Member]
Assets
Cash		2,419,531	903,472
Receivable from capital shares sold		2,846,576
Interest receivable		3,941
Total assets		5,756,235	2,901,405
Liabilities
Payable to Sponsor		2,443	2,312
Total liabilities		4,519	37,136
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity		5,751,716	2,864,269
Total liabilities and shareholders' equity		$ 5,756,235	$ 2,901,405
Shares outstanding		99,970	49,970
Net asset value per share		$ 57.53	$ 57.32
Market value per share		$ 57.55	$ 57.45
ProShares Ultra Yen [Member] | U.S. Government Agencies Short-term Debt Securities [Member]
Assets
Short-term U.S. government and agency obligations (Note 3)			$ 1,997,933
ProShares Ultra Yen [Member] | Foreign Currency Forward Contracts [Member]
Assets
Segregated cash balances		$ 307,000
Unrealized appreciation		179,187
Liabilities
Unrealized depreciation		2,076	34,824
ProShares UltraPro 3X Short Crude Oil ETF [Member]
Assets
Cash		13,456,117	19,203,543
Interest receivable		13,748
Offering costs (Note 5)			52,797
Limitation by Sponsor			35,309
Total assets		18,772,977	21,688,274
Liabilities
Payable on open futures contracts		89,382	527,098
Payable to Sponsor		18,496
Total liabilities		107,878	527,098
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity		18,665,099	21,161,176	[3]
Total liabilities and shareholders' equity		$ 18,772,977	$ 21,688,274
Shares outstanding		374,906	500,002
Net asset value per share	[2]	$ 49.79	$ 42.32	[4]
Market value per share		$ 48.43	$ 42.88
ProShares UltraPro 3X Short Crude Oil ETF [Member] | Futures Contracts [Member]
Assets
Segregated cash balances		$ 5,303,112	$ 2,396,625
ProShares UltraShort Australian Dollar [Member]
Assets
Cash		10,321,256	1,297,022
Receivable on open futures contracts		6,300
Interest receivable		8,475
Total assets		11,068,693	13,766,301
Liabilities
Payable on open futures contracts			52,950
Payable to Sponsor		8,360	11,249
Total liabilities		8,360	64,199
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity		11,060,333	13,702,102
Total liabilities and shareholders' equity		$ 11,068,693	$ 13,766,301
Shares outstanding		200,000	300,000
Net asset value per share		$ 55.30	$ 45.67
Market value per share		$ 54.92	$ 45.72
ProShares UltraShort Australian Dollar [Member] | U.S. Government Agencies Short-term Debt Securities [Member]
Assets
Short-term U.S. government and agency obligations (Note 3)		$ 299,537	$ 11,983,904
ProShares UltraShort Australian Dollar [Member] | Futures Contracts [Member]
Assets
Segregated cash balances		433,125	485,375
ProShares UltraShort Bloomberg Crude Oil [Member]
Assets
Cash		22,869,986	1,120,278
Receivable from capital shares sold		25,458,885
Receivable on open futures contracts		432,627
Interest receivable		36,428
Total assets		114,514,333	257,334,914
Liabilities
Payable on open futures contracts		48,600	693,787
Payable to Sponsor		88,422	190,701
Total liabilities		137,022	31,491,630
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity		114,377,311	225,843,284
Total liabilities and shareholders' equity		$ 114,514,333	$ 257,334,914
Shares outstanding		3,839,884	9,289,884
Net asset value per share		$ 29.79	$ 24.31
Market value per share		$ 29.28	$ 24.56
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Government Agencies Short-term Debt Securities [Member]
Assets
Short-term U.S. government and agency obligations (Note 3)		$ 27,967,534	$ 253,646,823
ProShares UltraShort Bloomberg Crude Oil [Member] | Futures Contracts [Member]
Assets
Segregated cash balances		2,746,147	2,567,813
ProShares UltraShort Bloomberg Crude Oil [Member] | Swap Agreements [Member]
Assets
Segregated cash balances		14,356,000
Unrealized appreciation		20,646,726
Liabilities
Unrealized depreciation			30,607,142
ProShares UltraShort Bloomberg Natural Gas [Member]
Assets
Cash		11,046,280	1,886,831
Receivable on open futures contracts		3,096,239
Interest receivable		11,379
Total assets		22,163,554	7,009,957
Liabilities
Payable for capital shares redeemed		4,321,588
Payable on open futures contracts			104,104
Payable to Sponsor		16,525	3,110
Total liabilities		4,338,113	107,214
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity		17,825,441	6,902,743
Total liabilities and shareholders' equity		$ 22,163,554	$ 7,009,957
Shares outstanding		824,832	174,832
Net asset value per share		$ 21.61	$ 39.48
Market value per share		$ 21.22	$ 39.65
ProShares UltraShort Bloomberg Natural Gas [Member] | U.S. Government Agencies Short-term Debt Securities [Member]
Assets
Short-term U.S. government and agency obligations (Note 3)		$ 299,714	$ 3,999,751
ProShares UltraShort Bloomberg Natural Gas [Member] | Futures Contracts [Member]
Assets
Segregated cash balances		7,709,942	1,123,375
ProShares UltraShort Euro [Member]
Assets
Cash		33,215,995	1,255,895
Interest receivable		15,999
Total assets		158,275,753	209,513,363
Liabilities
Payable for capital shares redeemed		2,427,020
Payable to Sponsor		128,696	171,595
Total liabilities		4,155,594	6,965,166
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity		154,120,159	202,548,197
Total liabilities and shareholders' equity		$ 158,275,753	$ 209,513,363
Shares outstanding		6,350,000	9,550,000
Net asset value per share		$ 24.27	$ 21.21
Market value per share		$ 24.25	$ 21.20
ProShares UltraShort Euro [Member] | U.S. Government Agencies Short-term Debt Securities [Member]
Assets
Short-term U.S. government and agency obligations (Note 3)		$ 121,801,685	$ 204,770,166
ProShares UltraShort Euro [Member] | Foreign Currency Forward Contracts [Member]
Assets
Segregated cash balances		3,138,000	3,038,000
Unrealized appreciation		104,074	449,302
Liabilities
Unrealized depreciation		1,599,878	6,793,571
ProShares UltraShort Silver [Member]
Assets
Cash		5,677,665	614,804
Interest receivable		7,847
Total assets		13,578,709	19,713,505
Liabilities
Payable for capital shares redeemed			3,171,777
Payable on open futures contracts		5,720	2,220
Payable to Sponsor		11,115	17,086
Total liabilities		1,809,846	4,907,246
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity		11,768,863	14,806,259
Total liabilities and shareholders' equity		$ 13,578,709	$ 19,713,505
Shares outstanding		316,976	466,976
Net asset value per share		$ 37.13	$ 31.71
Market value per share		$ 37.10	$ 31.40
ProShares UltraShort Silver [Member] | U.S. Government Agencies Short-term Debt Securities [Member]
Assets
Short-term U.S. government and agency obligations (Note 3)		$ 3,294,766	$ 18,349,861
ProShares UltraShort Silver [Member] | Futures Contracts [Member]
Assets
Segregated cash balances		44,431	10,340
ProShares UltraShort Silver [Member] | Forward Agreements [Member]
Assets
Segregated cash balances		4,554,000	738,500
Liabilities
Unrealized depreciation		1,793,011	1,716,163
ProShares UltraShort Yen [Member]
Assets
Cash		21,879,254	1,582,684
Interest receivable		14,973
Total assets		59,214,608	134,986,033
Liabilities
Payable for capital shares redeemed			3,759,983
Payable to Sponsor		49,037	106,863
Total liabilities		3,850,933	3,908,580
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity		55,363,675	131,077,453
Total liabilities and shareholders' equity		$ 59,214,608	$ 134,986,033
Shares outstanding		749,290	1,749,290
Net asset value per share		$ 73.89	$ 74.93
Market value per share		$ 73.86	$ 74.98
ProShares UltraShort Yen [Member] | U.S. Government Agencies Short-term Debt Securities [Member]
Assets
Short-term U.S. government and agency obligations (Note 3)		$ 34,951,229	$ 131,834,352
ProShares UltraShort Yen [Member] | Foreign Currency Forward Contracts [Member]
Assets
Segregated cash balances		1,691,000
Unrealized appreciation		678,152	1,568,997
Liabilities
Unrealized depreciation		3,801,896	41,734
ProShares VIX Short-Term Futures ETF [Member]
Assets
Cash		23,538,353	1,850,632
Receivable on open futures contracts		912,016	2,667,474
Interest receivable		16,966
Total assets		155,107,403	141,228,210
Liabilities
Payable for capital shares redeemed			3,431,713
Payable on open futures contracts		5,489,302
Payable to Sponsor		70,986	54,937
Total liabilities		5,560,288	3,486,650
Commitments and Contingencies (Note 2)
Shareholders' equity
Shareholders' equity		149,547,115	137,741,560
Total liabilities and shareholders' equity		$ 155,107,403	$ 141,228,210
Shares outstanding		3,876,317	5,901,317
Net asset value per share		$ 38.58	$ 23.34	[2]
Market value per share		$ 38.61	$ 23.15
ProShares VIX Short-Term Futures ETF [Member] | U.S. Government Agencies Short-term Debt Securities [Member]
Assets
Short-term U.S. government and agency obligations (Note 3)		$ 114,785,002	$ 134,845,604
ProShares VIX Short-Term Futures ETF [Member] | Futures Contracts [Member]
Assets
Segregated cash balances		$ 15,855,066	$ 1,864,500
[1]	The operations include the activity of ProShares UltraPro 3x Crude Oil ETF and ProShares UltraPro 3x Short Crude Oil ETF since January 13, 2017 (inception date).
[2]	See Note 1 of these Notes to Financial Statements.
[3]	Since the Fund's inception date was January 13, 2017, the Statement of Changes in Shareholders' Equity for the year ended December 31, 2016 has not been provided.
[4]	From commencement of operations, March 24, 2017 through December 31, 2017.

Statements of Financial Condi_2

Statements of Financial Condition (Parenthetical) - U.S. Government Agencies Short-term Debt Securities [Member] - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Short-term U.S. government and agency obligations, cost	$ 785,069,552	$ 2,445,970,899
ProShares Short Euro [Member]
Short-term U.S. government and agency obligations, cost	599,431	6,996,595
ProShares Ultra Bloomberg Crude Oil [Member]
Short-term U.S. government and agency obligations, cost	280,497,709	459,543,053
ProShares Ultra VIX Short-Term Futures ETF [Member]
Short-term U.S. government and agency obligations, cost		287,546,397
Proshares UltraPro 3x Crude Oil ETF [Member]
Short-term U.S. government and agency obligations, cost	20,979,000
ProShares UltraShort Gold [Member]
Short-term U.S. government and agency obligations, cost	3,989,775	31,979,626
ProShares VIX Mid-Term Futures ETF [Member]
Short-term U.S. government and agency obligations, cost		20,993,328
ProShares Short VIX Short-Term Futures ETF [Member]
Short-term U.S. government and agency obligations, cost		494,962,509
ProShares Ultra Bloomberg Natural Gas [Member]
Short-term U.S. government and agency obligations, cost	8,380,716	50,963,586
ProShares Ultra Euro [Member]
Short-term U.S. government and agency obligations, cost	1,496,665	6,996,595
ProShares Ultra Gold [Member]
Short-term U.S. government and agency obligations, cost	41,941,207	88,890,367
ProShares Ultra Silver [Member]
Short-term U.S. government and agency obligations, cost	123,793,893	235,605,469
ProShares Ultra Yen [Member]
Short-term U.S. government and agency obligations, cost		1,998,216
ProShares UltraShort Australian Dollar [Member]
Short-term U.S. government and agency obligations, cost	299,548	11,984,898
ProShares UltraShort Bloomberg Crude Oil [Member]
Short-term U.S. government and agency obligations, cost	27,967,127	253,669,155
ProShares UltraShort Bloomberg Natural Gas [Member]
Short-term U.S. government and agency obligations, cost	299,715	3,999,667
ProShares UltraShort Euro [Member]
Short-term U.S. government and agency obligations, cost	121,798,837	204,788,208
ProShares UltraShort Silver [Member]
Short-term U.S. government and agency obligations, cost	3,294,789	18,352,808
ProShares UltraShort Yen [Member]
Short-term U.S. government and agency obligations, cost	34,950,807	131,844,652
ProShares VIX Short-Term Futures ETF [Member]
Short-term U.S. government and agency obligations, cost	$ 114,780,333	$ 134,855,770

Statements of Operations

Statements of Operations - USD ($)		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Investment Income
Interest		$ 32,979,194	$ 25,704,093	[1]	$ 9,133,928	[2]
Expenses
Management fee		23,335,844	30,996,127	[1]	34,712,239	[2]
Brokerage commissions		5,852,459	8,950,082	[1]	7,438,871	[2]
Brokerage fees		156,052	9,715	[1]
Offering costs		105,643	238,151	[1]
Limitation by Sponsor		(27,133)	(59,651)	[1]
Total expenses		29,422,865	40,134,424	[1]	42,151,110	[2]
Net investment income (loss)		3,556,329	(14,430,331)	[1]	(33,017,182)	[2]
Net realized gain (loss) on
Net realized gain (loss)		(1,483,065,223)	(438,531,686)	[1]	(1,320,602,359)	[2]
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		(52,874,307)	(5,496,117)	[1]	157,868,764	[2]
Net realized and unrealized gain (loss)		(1,535,939,530)	(444,027,803)	[1]	(1,162,733,595)	[2]
Net income (loss)		(1,532,383,201)	(458,458,134)	[1]	(1,195,750,777)	[2]
Futures Contracts [Member]
Net realized gain (loss) on
Net realized gain (loss)		(1,441,403,318)	(354,314,223)	[1]	(1,286,470,453)	[2]
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		26,203,793	(360,935)	[1]	(22,030,613)	[2]
Swap Agreements [Member]
Net realized gain (loss) on
Net realized gain (loss)		(2,745,254)	(11,794,313)	[1]	(25,398,375)	[2]
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		(85,082,567)	(11,520,471)	[1]	108,928,215	[2]
Forward Agreements [Member]
Net realized gain (loss) on
Net realized gain (loss)		(58,472,765)	(26,118,074)	[1]	38,357,981	[2]
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		5,593,954	43,166,751	[1]	(2,765,009)	[2]
Foreign Currency Forward Contracts [Member]
Net realized gain (loss) on
Net realized gain (loss)		19,830,895	(46,255,034)	[1]	(47,075,744)	[2]
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		203,179	(36,579,460)	[1]	73,731,339	[2]
U.S. Government Agencies Short-term Debt Securities [Member]
Net realized gain (loss) on
Net realized gain (loss)		(274,781)	(50,042)	[1]	(15,768)	[2]
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		207,334	(202,002)	[1]	4,832	[2]
ProShares Short Euro [Member]
Investment Income
Interest		123,954	75,953		32,959
Expenses
Management fee		78,253	111,736		153,021
Brokerage commissions		1,244	1,844		2,666
Total expenses		79,497	113,580		155,687
Net investment income (loss)		44,457	(37,627)		(122,728)
Net realized gain (loss) on
Net realized gain (loss)		459,984	(1,162,371)		663,807
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		123,365	(299,569)		(110,526)
Net realized and unrealized gain (loss)		583,349	(1,461,940)		553,281
Net income (loss)		627,806	(1,499,567)		430,553
ProShares Short Euro [Member] | Futures Contracts [Member]
Net realized gain (loss) on
Net realized gain (loss)		459,984	(1,161,987)		663,774
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		123,007	(299,188)		(110,538)
ProShares Short Euro [Member] | U.S. Government Agencies Short-term Debt Securities [Member]
Net realized gain (loss) on
Net realized gain (loss)			(384)		33
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		358	(381)		12
ProShares Short VIX Short-Term Futures ETF [Member]
Investment Income
Interest		5,721,966	6,001,679		1,126,057
Expenses
Management fee		5,617,477	7,147,223		4,448,808
Brokerage commissions		2,162,086	4,226,442		2,074,099
Brokerage fees		151,758	1,558
Total expenses		7,931,321	11,375,223		6,522,907
Net investment income (loss)		(2,209,355)	(5,373,544)		(5,396,850)
Net realized gain (loss) on
Net realized gain (loss)		(1,885,823,832)	897,400,073		440,379,719
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		(31,465,785)	27,294,500		(21,062,850)
Net realized and unrealized gain (loss)		(1,917,289,617)	924,694,573		419,316,869
Net income (loss)		(1,919,498,972)	919,321,029		413,920,019
ProShares Short VIX Short-Term Futures ETF [Member] | Futures Contracts [Member]
Net realized gain (loss) on
Net realized gain (loss)		(1,885,564,719)	897,400,516		440,391,389
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		(31,517,650)	27,351,060		(21,056,026)
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Government Agencies Short-term Debt Securities [Member]
Net realized gain (loss) on
Net realized gain (loss)		(259,113)	(443)		(11,670)
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		51,865	(56,560)		(6,824)
ProShares Ultra Bloomberg Crude Oil [Member]
Investment Income
Interest		7,041,517	5,982,049		2,170,633
Expenses
Management fee		3,918,014	7,120,247		8,263,078
Brokerage commissions		100,695	241,263		538,935
Total expenses		4,018,709	7,361,510		8,802,013
Net investment income (loss)		3,022,808	(1,379,461)		(6,631,380)
Net realized gain (loss) on
Net realized gain (loss)		21,754,687	22,131,716		74,043,666
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		(160,959,424)	13,257,749		151,007,102
Net realized and unrealized gain (loss)		(139,204,737)	35,389,465		225,050,768
Net income (loss)		(136,181,929)	34,010,004		218,419,388
ProShares Ultra Bloomberg Crude Oil [Member] | Futures Contracts [Member]
Net realized gain (loss) on
Net realized gain (loss)		(3,149,395)	28,048,922		43,093,616
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		(25,986,280)	6,408,814		23,466,479
ProShares Ultra Bloomberg Crude Oil [Member] | Swap Agreements [Member]
Net realized gain (loss) on
Net realized gain (loss)		24,906,389	(5,902,710)		30,967,424
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		(135,005,486)	6,879,790		127,535,160
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Government Agencies Short-term Debt Securities [Member]
Net realized gain (loss) on
Net realized gain (loss)		(2,307)	(14,496)		(17,374)
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		32,342	(30,855)		5,463
ProShares Ultra Bloomberg Natural Gas [Member]
Investment Income
Interest		489,924	339,079		72,943
Expenses
Management fee		305,706	446,589		325,435
Brokerage commissions		87,899	126,252		131,994
Total expenses		393,605	572,841		457,429
Net investment income (loss)		96,319	(233,762)		(384,486)
Net realized gain (loss) on
Net realized gain (loss)		21,092,833	(40,794,286)		17,571,111
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		(17,547,032)	4,686,596		(3,776,978)
Net realized and unrealized gain (loss)		3,545,801	(36,107,690)		13,794,133
Net income (loss)		3,642,120	(36,341,452)		13,409,647
ProShares Ultra Bloomberg Natural Gas [Member] | Futures Contracts [Member]
Net realized gain (loss) on
Net realized gain (loss)		21,092,864	(40,793,265)		17,571,809
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		(17,548,973)	4,689,090		(3,776,159)
ProShares Ultra Bloomberg Natural Gas [Member] | U.S. Government Agencies Short-term Debt Securities [Member]
Net realized gain (loss) on
Net realized gain (loss)		(31)	(1,021)		(698)
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		1,941	(2,494)		(819)
ProShares Ultra Euro [Member]
Investment Income
Interest		112,904	94,761		25,015
Expenses
Management fee		82,081	124,543		99,537
Total expenses		82,081	124,543		99,537
Net investment income (loss)		30,823	(29,782)		(74,522)
Net realized gain (loss) on
Net realized gain (loss)		(1,063,816)	2,212,226		139,113
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		(205,861)	837,700		(1,178,425)
Net realized and unrealized gain (loss)		(1,269,677)	3,049,926		(1,039,312)
Net income (loss)		(1,238,854)	3,020,144		(1,113,834)
ProShares Ultra Euro [Member] | Foreign Currency Forward Contracts [Member]
Net realized gain (loss) on
Net realized gain (loss)		(1,063,823)	2,212,313		138,959
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		(206,214)	838,162		(1,178,930)
ProShares Ultra Euro [Member] | U.S. Government Agencies Short-term Debt Securities [Member]
Net realized gain (loss) on
Net realized gain (loss)		7	(87)		154
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		353	(462)		505
ProShares Ultra Gold [Member]
Investment Income
Interest		1,437,347	766,560		249,319
Expenses
Management fee		811,581	902,841		900,227
Brokerage commissions		135	48		43
Total expenses		811,716	902,889		900,270
Net investment income (loss)		625,631	(136,329)		(650,951)
Net realized gain (loss) on
Net realized gain (loss)		(7,345,178)	11,485,101		5,815,759
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		680,186	8,096,461		(2,198,661)
Net realized and unrealized gain (loss)		(6,664,992)	19,581,562		3,617,098
Net income (loss)		(6,039,361)	19,445,233		2,966,147
ProShares Ultra Gold [Member] | Futures Contracts [Member]
Net realized gain (loss) on
Net realized gain (loss)		(21,640)	2,839		29,500
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		67,190	24,440		(13,760)
ProShares Ultra Gold [Member] | Forward Agreements [Member]
Net realized gain (loss) on
Net realized gain (loss)		(7,323,366)	11,481,571		5,787,065
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		606,946	8,077,462		(2,180,512)
ProShares Ultra Gold [Member] | U.S. Government Agencies Short-term Debt Securities [Member]
Net realized gain (loss) on
Net realized gain (loss)		(172)	691		(806)
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		6,050	(5,441)		(4,389)
ProShares Ultra Silver [Member]
Investment Income
Interest		3,490,072	2,142,183		842,215
Expenses
Management fee		2,020,586	2,551,877		3,021,562
Brokerage commissions		307	58		45
Total expenses		2,020,893	2,551,935		3,021,607
Net investment income (loss)		1,469,179	(409,752)		(2,179,392)
Net realized gain (loss) on
Net realized gain (loss)		(57,489,729)	(31,762,627)		62,342,586
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		4,931,185	42,712,371		1,571,491
Net realized and unrealized gain (loss)		(52,558,544)	10,949,744		63,914,077
Net income (loss)		(51,089,365)	10,539,992		61,734,685
ProShares Ultra Silver [Member] | Futures Contracts [Member]
Net realized gain (loss) on
Net realized gain (loss)		(32,131)	(21,522)		45,750
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		339,136	28,960		(18,330)
ProShares Ultra Silver [Member] | Forward Agreements [Member]
Net realized gain (loss) on
Net realized gain (loss)		(57,456,395)	(31,741,312)		62,296,691
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		4,566,383	42,711,523		1,584,912
ProShares Ultra Silver [Member] | U.S. Government Agencies Short-term Debt Securities [Member]
Net realized gain (loss) on
Net realized gain (loss)		(1,203)	207		145
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		25,666	(28,112)		4,909
ProShares Ultra VIX Short-Term Futures ETF [Member]
Investment Income
Interest		3,853,146	3,040,059		1,639,964
Expenses
Management fee		3,966,185	3,960,999		6,417,822
Brokerage commissions		3,032,632	3,970,588		4,158,919
Brokerage fees			4,533
Total expenses		6,998,817	7,936,120		10,576,741
Net investment income (loss)		(3,145,671)	(4,896,061)		(8,936,777)
Net realized gain (loss) on
Net realized gain (loss)		389,993,011	(1,020,772,793)		(1,567,324,739)
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		65,652,401	(26,502,876)		(19,895,547)
Net realized and unrealized gain (loss)		455,645,412	(1,047,275,669)		(1,587,220,286)
Net income (loss)		452,499,741	(1,052,171,730)		(1,596,157,063)
ProShares Ultra VIX Short-Term Futures ETF [Member] | Futures Contracts [Member]
Net realized gain (loss) on
Net realized gain (loss)		379,449,269	(1,020,750,851)		(1,567,340,688)
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		66,970,085	(26,493,883)		(19,866,703)
ProShares Ultra VIX Short-Term Futures ETF [Member] | Swap Agreements [Member]
Net realized gain (loss) on
Net realized gain (loss)		10,551,473
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		(1,330,949)
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Government Agencies Short-term Debt Securities [Member]
Net realized gain (loss) on
Net realized gain (loss)		(7,731)	(21,942)		15,949
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		13,265	(8,993)		(28,844)
ProShares Ultra Yen [Member]
Investment Income
Interest		26,930	28,639		16,858
Expenses
Management fee		27,913	50,521		62,705
Total expenses		27,913	50,521		62,705
Net investment income (loss)		(983)	(21,882)		(45,847)
Net realized gain (loss) on
Net realized gain (loss)		(170,364)	(46,278)		717,052
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		212,218	307,194		(603,897)
Net realized and unrealized gain (loss)		41,854	260,916		113,155
Net income (loss)		40,871	239,034		67,308
ProShares Ultra Yen [Member] | Foreign Currency Forward Contracts [Member]
Net realized gain (loss) on
Net realized gain (loss)		(170,364)	(46,195)		717,086
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		211,935	307,252		(603,387)
ProShares Ultra Yen [Member] | U.S. Government Agencies Short-term Debt Securities [Member]
Net realized gain (loss) on
Net realized gain (loss)			(83)		(34)
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		283	(58)		(510)
Proshares UltraPro 3x Crude Oil ETF [Member]
Investment Income
Interest		351,928	9,696	[3]
Expenses
Management fee		277,762
Brokerage commissions		86,561	34,408	[3]
Brokerage fees	[3]		67
Offering costs		52,846	119,081	[3],[4]
Limitation by Sponsor		(26,957)	(24,342)	[3]
Total expenses		390,212	129,214	[3]
Net investment income (loss)		(38,284)	(119,518)	[3],[5]
Net realized gain (loss) on
Net realized gain (loss)		(37,435,672)	6,018,618	[3],[5]
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		(24,868,483)	1,417,998	[3],[5]
Net realized and unrealized gain (loss)		(62,304,155)	7,436,616	[3]
Net income (loss)		(62,342,439)	7,317,098	[3],[5]
Proshares UltraPro 3x Crude Oil ETF [Member] | Futures Contracts [Member]
Net realized gain (loss) on
Net realized gain (loss)		(37,435,672)	6,018,618	[3]
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		(24,869,359)	1,417,998	[3]
Proshares UltraPro 3x Crude Oil ETF [Member] | U.S. Government Agencies Short-term Debt Securities [Member]
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		876
ProShares UltraPro 3X Short Crude Oil ETF [Member]
Investment Income
Interest		190,658	5,930	[3]
Expenses
Management fee		176,390
Brokerage commissions		70,338	32,624	[3]
Brokerage fees	[3]		135
Offering costs		52,797	119,070	[3],[4]
Limitation by Sponsor		(176)	(35,309)	[3]
Total expenses		299,349	(116,520)	[3]
Net investment income (loss)		(108,691)	(110,590)	[3],[5]
Net realized gain (loss) on
Net realized gain (loss)		7,377,281	(7,046,628)	[3],[5]
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		10,007,630	(2,988,155)	[3],[5]
Net realized and unrealized gain (loss)		17,384,911	(10,034,783)	[3]
Net income (loss)		17,276,220	(10,145,373)	[3],[5]
ProShares UltraPro 3X Short Crude Oil ETF [Member] | Futures Contracts [Member]
Net realized gain (loss) on
Net realized gain (loss)		7,377,281	(7,046,628)	[3]
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		10,007,630	(2,988,155)	[3]
ProShares UltraShort Australian Dollar [Member]
Investment Income
Interest		119,098	85,306		43,459
Expenses
Management fee		75,944	123,234		175,191
Brokerage commissions		6,408	8,846		13,920
Total expenses		82,352	132,080		189,111
Net investment income (loss)		36,746	(46,774)		(145,652)
Net realized gain (loss) on
Net realized gain (loss)		128,204	(866,949)		(2,786,709)
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		1,406,028	(2,076,278)		1,602,889
Net realized and unrealized gain (loss)		1,534,232	(2,943,227)		(1,183,820)
Net income (loss)		1,570,978	(2,990,001)		(1,329,472)
ProShares UltraShort Australian Dollar [Member] | Futures Contracts [Member]
Net realized gain (loss) on
Net realized gain (loss)		128,451	(866,771)		(2,787,204)
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		1,405,045	(2,075,560)		1,602,610
ProShares UltraShort Australian Dollar [Member] | U.S. Government Agencies Short-term Debt Securities [Member]
Net realized gain (loss) on
Net realized gain (loss)		(247)	(178)		495
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		983	(718)		279
ProShares UltraShort Bloomberg Crude Oil [Member]
Investment Income
Interest		2,758,399	1,661,295		500,160
Expenses
Management fee		1,663,576	1,934,688		1,755,696
Brokerage commissions		56,193	82,258		153,428
Total expenses		1,719,769	2,016,946		1,909,124
Net investment income (loss)		1,038,630	(355,651)		(1,408,964)
Net realized gain (loss) on
Net realized gain (loss)		(42,039,983)	(6,491,508)		(67,756,228)
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		58,511,410	(20,957,983)		(22,509,153)
Net realized and unrealized gain (loss)		16,471,427	(27,449,491)		(90,265,381)
Net income (loss)		17,510,057	(27,805,142)		(91,674,345)
ProShares UltraShort Bloomberg Crude Oil [Member] | Futures Contracts [Member]
Net realized gain (loss) on
Net realized gain (loss)		(3,836,970)	(599,457)		(12,045,454)
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		7,234,803	(2,535,833)		(3,891,328)
ProShares UltraShort Bloomberg Crude Oil [Member] | Swap Agreements [Member]
Net realized gain (loss) on
Net realized gain (loss)		(38,203,116)	(5,891,603)		(55,706,710)
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		51,253,868	(18,400,261)		(18,619,537)
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Government Agencies Short-term Debt Securities [Member]
Net realized gain (loss) on
Net realized gain (loss)		103	(448)		(4,064)
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		22,739	(21,889)		1,712
ProShares UltraShort Bloomberg Natural Gas [Member]
Investment Income
Interest		121,027	38,651		19,053
Expenses
Management fee		84,418	63,534		81,259
Brokerage commissions		41,063	29,529		59,966
Brokerage fees			39
Total expenses		125,481	93,102		141,225
Net investment income (loss)		(4,454)	(54,451)		(122,172)
Net realized gain (loss) on
Net realized gain (loss)		(14,147,964)	4,761,749		589,999
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		11,934,953	(614,897)		1,988,745
Net realized and unrealized gain (loss)		(2,213,011)	4,146,852		2,578,744
Net income (loss)		(2,217,465)	4,092,401		2,456,572
ProShares UltraShort Bloomberg Natural Gas [Member] | Futures Contracts [Member]
Net realized gain (loss) on
Net realized gain (loss)		(14,147,964)	4,762,532		586,860
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		11,935,038	(615,018)		1,989,133
ProShares UltraShort Bloomberg Natural Gas [Member] | U.S. Government Agencies Short-term Debt Securities [Member]
Net realized gain (loss) on
Net realized gain (loss)			(783)		3,139
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		(85)	121		(388)
ProShares UltraShort Euro [Member]
Investment Income
Interest		3,045,321	2,048,455		1,012,886
Expenses
Management fee		1,720,827	2,445,170		3,777,543
Total expenses		1,720,827	2,445,170		3,777,543
Net investment income (loss)		1,324,494	(396,715)		(2,764,657)
Net realized gain (loss) on
Net realized gain (loss)		18,953,236	(39,695,465)		(25,711,276)
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		4,869,355	(22,527,463)		44,885,942
Net realized and unrealized gain (loss)		23,822,591	(62,222,928)		19,174,666
Net income (loss)		25,147,085	(62,619,643)		16,410,009
ProShares UltraShort Euro [Member] | Foreign Currency Forward Contracts [Member]
Net realized gain (loss) on
Net realized gain (loss)		18,953,455	(39,691,680)		(25,711,518)
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		4,848,465	(22,507,200)		44,873,267
ProShares UltraShort Euro [Member] | U.S. Government Agencies Short-term Debt Securities [Member]
Net realized gain (loss) on
Net realized gain (loss)		(219)	(3,785)		242
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		20,890	(20,263)		12,675
ProShares UltraShort Gold [Member]
Investment Income
Interest		423,926	283,917		164,570
Expenses
Management fee		252,524	344,734		625,950
Brokerage commissions		61	48		43
Total expenses		252,585	344,782		625,993
Net investment income (loss)		171,341	(60,865)		(461,423)
Net realized gain (loss) on
Net realized gain (loss)		1,323,731	(6,994,765)		(12,241,129)
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		472,667	(4,548,271)		1,240,412
Net realized and unrealized gain (loss)		1,796,398	(11,543,036)		(11,000,717)
Net income (loss)		1,967,739	(11,603,901)		(11,462,140)
ProShares UltraShort Gold [Member] | Futures Contracts [Member]
Net realized gain (loss) on
Net realized gain (loss)		21,620	(2,987)		(29,440)
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		(26,320)	(24,440)		13,760
ProShares UltraShort Gold [Member] | Forward Agreements [Member]
Net realized gain (loss) on
Net realized gain (loss)		1,301,959	(6,990,570)		(12,211,311)
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		497,473	(4,521,825)		1,224,624
ProShares UltraShort Gold [Member] | U.S. Government Agencies Short-term Debt Securities [Member]
Net realized gain (loss) on
Net realized gain (loss)		152	(1,208)		(378)
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		1,514	(2,006)		2,028
ProShares UltraShort Silver [Member]
Investment Income
Interest		309,090	157,745		93,483
Expenses
Management fee		196,546	194,297		349,293
Brokerage commissions		72	48		43
Total expenses		196,618	194,345		349,336
Net investment income (loss)		112,472	(36,600)		(255,853)
Net realized gain (loss) on
Net realized gain (loss)		5,022,945	1,152,461		(17,556,630)
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		(117,191)	(3,132,869)		(3,372,326)
Net realized and unrealized gain (loss)		4,905,754	(1,980,408)		(20,928,956)
Net income (loss)		5,018,226	(2,017,008)		(21,184,809)
ProShares UltraShort Silver [Member] | Futures Contracts [Member]
Net realized gain (loss) on
Net realized gain (loss)		19,939	21,156		(40,250)
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		(43,267)	(28,960)		21,340
ProShares UltraShort Silver [Member] | Forward Agreements [Member]
Net realized gain (loss) on
Net realized gain (loss)		5,005,037	1,132,237		(17,514,464)
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		(76,848)	(3,100,409)		(3,394,033)
ProShares UltraShort Silver [Member] | U.S. Government Agencies Short-term Debt Securities [Member]
Net realized gain (loss) on
Net realized gain (loss)		(2,031)	(932)		(1,916)
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		2,924	(3,500)		367
ProShares UltraShort Yen [Member]
Investment Income
Interest		1,399,342	1,446,842		531,771
Expenses
Management fee		791,468	1,802,816		2,141,333
Total expenses		791,468	1,802,816		2,141,333
Net investment income (loss)		607,874	(355,974)		(1,609,562)
Net realized gain (loss) on
Net realized gain (loss)		2,111,630	(8,733,473)		(22,226,181)
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		(4,640,285)	(15,227,152)		30,657,216
Net realized and unrealized gain (loss)		(2,528,655)	(23,960,625)		8,431,035
Net income (loss)		(1,920,781)	(24,316,599)		6,821,473
ProShares UltraShort Yen [Member] | Foreign Currency Forward Contracts [Member]
Net realized gain (loss) on
Net realized gain (loss)		2,111,627	(8,729,472)		(22,220,271)
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		(4,651,007)	(15,217,674)		30,640,389
ProShares UltraShort Yen [Member] | U.S. Government Agencies Short-term Debt Securities [Member]
Net realized gain (loss) on
Net realized gain (loss)		3	(4,001)		(5,910)
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		10,722	(9,478)		16,827
ProShares VIX Mid-Term Futures ETF [Member]
Investment Income
Interest		368,351	256,920		107,409
Expenses
Management fee		221,717	317,739		369,016
Brokerage commissions		30,306	20,988		32,884
Total expenses		252,023	338,727		401,900
Net investment income (loss)		116,328	(81,807)		(294,491)
Net realized gain (loss) on
Net realized gain (loss)		4,332,654	(25,320,147)		(11,085,007)
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		5,973,199	(926,594)		(944,964)
Net realized and unrealized gain (loss)		10,305,853	(26,246,741)		(12,029,971)
Net income (loss)		10,422,181	(26,328,548)		(12,324,462)
ProShares VIX Mid-Term Futures ETF [Member] | Futures Contracts [Member]
Net realized gain (loss) on
Net realized gain (loss)		4,332,654	(25,319,770)		(11,085,506)
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		5,973,386	(927,035)		(943,885)
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Government Agencies Short-term Debt Securities [Member]
Net realized gain (loss) on
Net realized gain (loss)			(377)		499
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		(187)	441		(1,079)
ProShares VIX Short-Term Futures ETF [Member]
Investment Income
Interest		1,594,294	1,238,374		466,392
Expenses
Management fee		1,046,876	1,353,339		1,632,880
Brokerage commissions		176,459	174,838		270,159
Brokerage fees		4,294	3,383
Total expenses		1,227,629	1,531,560		1,903,039
Net investment income (loss)		366,665	(293,186)		(1,436,647)
Net realized gain (loss) on
Net realized gain (loss)		89,901,119	(194,006,340)		(195,469,141)
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		22,155,157	(4,304,579)		612,983
Net realized and unrealized gain (loss)		112,056,276	(198,310,919)		(194,856,158)
Net income (loss)		112,422,941	(198,604,105)		(196,292,805)
ProShares VIX Short-Term Futures ETF [Member] | Futures Contracts [Member]
Net realized gain (loss) on
Net realized gain (loss)		89,903,111	(194,005,568)		(195,475,791)
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		22,140,322	(4,293,225)		609,973
ProShares VIX Short-Term Futures ETF [Member] | U.S. Government Agencies Short-term Debt Securities [Member]
Net realized gain (loss) on
Net realized gain (loss)		(1,992)	(772)		6,650
Change in net unrealized appreciation/depreciation on
Change in net unrealized appreciation/depreciation		$ 14,835	$ (11,354)		$ 3,010
[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]	Since the Fund's inception date was January 13, 2017, the Statement of Operations for the year ended December 31, 2016 has not been provided.
[4]	Since the Fund's inception date was January 13, 2017, the Statement of Cash Flows for the year ended December 31, 2016 has not been provided.
[5]	Since the Fund's inception date was January 13, 2017, the Statement of Changes in Shareholders' Equity for the year ended December 31, 2016 has 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]		ProShares UltraPro 3X Short Crude Oil ETF [Member]		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, 2015	$ 3,506,608,748	[1]	$ 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	[1]	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)	[1]	(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	[1]	(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)	[1]	(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)	[1]	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	[1]	(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)	[1]	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	[1],[2]	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					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	[2]		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	[3]	$ 38,429,372	[3]	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)	[2]	(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)	[3]	(7,122,823)	[3]	(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	[2]	(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	[3]	31,306,549	[3]	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)	[2]	(37,627)	(5,373,544)	(1,379,461)	(233,762)	(29,782)	(136,329)	(409,752)	(4,896,061)	(21,882)	(119,518)	[3],[4]	(110,590)	[3],[4]	(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)	[2]	(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	[3],[4]	(7,046,628)	[3],[4]	(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)	[2]	(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	[3],[4]	(2,988,155)	[3],[4]	(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)	[2]	(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	[3],[4]	(10,145,373)	[3],[4]	(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	[2]	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	[3]	21,161,176	[3]	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
Addition of shares	6,250,352,624			2,433,234,181	518,136,436	53,884,378	2,653,492	20,994,687	56,650,169	2,228,542,993	2,846,576	186,003,485		62,030,238		5,028,505	247,024,351	53,822,972	37,244,830	16,527,151	27,656,086	7,078,646	56,218,143	234,775,305
Redemption of shares	(5,721,272,610)			(939,302,817)	(538,000,379)	(106,178,008)	(3,461,585)	(25,140,780)	(61,981,124)	(2,860,773,004)		(47,329,487)		(81,802,535)		(9,241,252)	(376,000,381)	(40,682,809)	(110,819,953)	(31,893,303)	(35,711,708)	(80,871,643)	(36,689,151)	(335,392,691)
Net addition (redemption) of shares	529,080,014			1,493,931,364	(19,863,943)	(52,293,630)	(808,093)	(4,146,093)	(5,330,955)	(632,230,011)	2,846,576	138,673,998		(19,772,297)		(4,212,747)	(128,976,030)	13,140,163	(73,575,123)	(15,366,152)	(8,055,622)	(73,792,997)	19,528,992	(100,617,386)
Net investment income (loss)	3,556,329		44,457	(2,209,355)	3,022,808	96,319	30,823	625,631	1,469,179	(3,145,671)	(983)	(38,284)		(108,691)		36,746	1,038,630	(4,454)	1,324,494	171,341	112,472	607,874	116,328	366,665
Net realized gain (loss)	(1,483,065,223)		459,984	(1,885,823,832)	21,754,687	21,092,833	(1,063,816)	(7,345,178)	(57,489,729)	389,993,011	(170,364)	(37,435,672)		7,377,281		128,204	(42,039,983)	(14,147,964)	18,953,236	1,323,731	5,022,945	2,111,630	4,332,654	89,901,119
Change in net unrealized appreciation/depreciation	(52,874,307)		123,365	(31,465,785)	(160,959,424)	(17,547,032)	(205,861)	680,186	4,931,185	65,652,401	212,218	(24,868,483)		10,007,630		1,406,028	58,511,410	11,934,953	4,869,355	472,667	(117,191)	(4,640,285)	5,973,199	22,155,157
Net income (loss)	(1,532,383,201)		627,806	(1,919,498,972)	(136,181,929)	3,642,120	(1,238,854)	(6,039,361)	(51,089,365)	452,499,741	40,871	(62,342,439)		17,276,220		1,570,978	17,510,057	(2,217,465)	25,147,085	1,967,739	5,018,226	(1,920,781)	10,422,181	112,422,941
Shareholders' equity, end of period at Dec. 31, 2018	$ 1,943,975,025		$ 8,619,686	$ 344,596,263	$ 368,399,654	$ 14,617,440	$ 7,544,569	$ 83,523,294	$ 201,824,376	$ 214,304,871	$ 5,751,716	$ 87,667,042		$ 18,665,099		$ 11,060,333	$ 114,377,311	$ 17,825,441	$ 154,120,159	$ 18,098,997	$ 11,768,863	$ 55,363,675	$ 56,299,121	$ 149,547,115
[1]	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.
[2]	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).
[3]	Since the Fund's inception date was January 13, 2017, the Statement of Changes in Shareholders' Equity for the year ended December 31, 2016 has not been provided.
[4]	Since the Fund's inception date was January 13, 2017, the Statement of Operations for the year ended December 31, 2016 has not been provided.

Statements of Changes in Shar_2

Statements of Changes in Shareholders' Equity (Parenthetical) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Addition, shares	125,567,500	135,939,510	[1]	125,154,150	[2]
Redemption, shares	123,725,617	144,218,291	[1]	120,735,291	[2]
Net addition (redemption), shares	1,841,883	(8,278,781)	[1]	4,418,859	[2]
ProShares Short Euro [Member]
Addition, shares	0	0		50,000
Redemption, shares	0	150,000		100,005
Net addition (redemption), shares	0	(150,000)		(50,005)
ProShares Short VIX Short-Term Futures ETF [Member]
Addition, shares	19,000,000	13,137,500		26,475,000
Redemption, shares	12,378,193	12,875,000		31,550,020
Net addition (redemption), shares	6,621,807	262,500		(5,075,020)
ProShares Ultra Bloomberg Crude Oil [Member]
Addition, shares	24,600,000	68,500,000		62,875,000
Redemption, shares	18,550,000	86,352,616		54,025,001
Net addition (redemption), shares	6,050,000	(17,852,616)		8,849,999
ProShares Ultra Bloomberg Natural Gas [Member]
Addition, shares	1,600,000	2,510,000		690,000
Redemption, shares	2,960,284	1,030,000		650,000
Net addition (redemption), shares	(1,360,284)	1,480,000		40,000
ProShares Ultra Euro [Member]
Addition, shares	150,000	1,600,000		300,000
Redemption, shares	200,000	1,900,000		150,014
Net addition (redemption), shares	(50,000)	(300,000)		149,986
ProShares Ultra Gold [Member]
Addition, shares	550,000	650,000		1,050,000
Redemption, shares	650,000	1,100,000		600,014
Net addition (redemption), shares	(100,000)	(450,000)		449,986
ProShares Ultra Silver [Member]
Addition, shares	2,100,000	1,550,000		2,800,000
Redemption, shares	2,150,000	2,100,000		2,550,007
Net addition (redemption), shares	(50,000)	(550,000)		249,993
ProShares Ultra VIX Short-Term Futures ETF [Member]
Addition, shares	38,280,000	17,117,000		1,447,900
Redemption, shares	43,274,536	10,084,629		893,828
Net addition (redemption), shares	(4,994,536)	7,032,371		554,072
ProShares Ultra Yen [Member]
Addition, shares	50,000
Redemption, shares		50,000		4
Net addition (redemption), shares	50,000	(50,000)		(4)
Proshares UltraPro 3x Crude Oil ETF [Member]
Addition, shares	7,250,000	1,750,008	[3]
Redemption, shares	850,008	1,450,000	[3]
Net addition (redemption), shares	6,399,992	300,008	[3]
ProShares UltraPro 3X Short Crude Oil ETF [Member]
Addition, shares	2,637,500	575,002	[3]
Redemption, shares	2,762,596	75,000	[3]
Net addition (redemption), shares	(125,096)	500,002	[3]
ProShares UltraShort Australian Dollar [Member]
Addition, shares	100,000	100,000
Redemption, shares	200,000	100,000		50,005
Net addition (redemption), shares	(100,000)			(50,005)
ProShares UltraShort Bloomberg Crude Oil [Member]
Addition, shares	13,300,000	14,500,000		18,500,000
Redemption, shares	18,750,000	11,550,000		13,600,004
Net addition (redemption), shares	(5,450,000)	2,950,000		4,899,996
ProShares UltraShort Bloomberg Natural Gas [Member]
Addition, shares	2,500,000	650,000		950,000
Redemption, shares	1,850,000	650,000		1,000,024
Net addition (redemption), shares	650,000			(50,024)
ProShares UltraShort Euro [Member]
Addition, shares	1,700,000	2,400,000		650,000
Redemption, shares	4,900,000	5,750,000		8,200,014
Net addition (redemption), shares	(3,200,000)	(3,350,000)		(7,550,014)
ProShares UltraShort Gold [Member]
Addition, shares	250,000	350,000		1,050,000
Redemption, shares	450,000	600,000		1,000,000
Net addition (redemption), shares	(200,000)	(250,000)		50,000
ProShares UltraShort Silver [Member]
Addition, shares	800,000	850,000		1,650,000
Redemption, shares	950,000	1,000,000		1,900,002
Net addition (redemption), shares	(150,000)	(150,000)		(250,002)
ProShares UltraShort Yen [Member]
Addition, shares	100,000	1,000,000		2,300,000
Redemption, shares	1,100,000	2,700,000		1,550,004
Net addition (redemption), shares	(1,000,000)	(1,700,000)		749,996
ProShares VIX Mid-Term Futures ETF [Member]
Addition, shares	2,325,000	950,000		1,100,000
Redemption, shares	1,450,000	800,000		525,001
Net addition (redemption), shares	875,000	150,000		574,999
ProShares VIX Short-Term Futures ETF [Member]
Addition, shares	8,275,000	7,750,000		3,066,250
Redemption, shares	10,300,000	3,901,046		1,411,378
Net addition (redemption), shares	(2,025,000)	3,848,954		1,654,872
[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]	Since the Fund's inception date was January 13, 2017, the Statement of Changes in Shareholders' Equity for the year ended December 31, 2016 has not been provided.

Statements of Cash Flows

Statements of Cash Flows - USD ($)		12 Months Ended
		Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Cash flow from operating activities
Net income (loss)		$ (1,532,383,201)		$ (458,458,134)	[1]	$ (1,195,750,777)	[2]
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		(99,953,125,278)		(31,621,104,918)	[1]	(18,373,450,463)	[2]
Proceeds from sales or maturities of short-term U.S government and agency obligations		101,639,196,463		32,238,762,028	[1]	18,657,310,693	[2]
Net amortization and accretion on short-term U.S government and agency obligations		(25,444,619)		(24,840,586)	[1]	(9,128,007)	[2]
Net realized gain (loss) on investments		274,781		50,042	[1]	15,768	[2]
Change in unrealized appreciation/depreciation on investments		79,078,100		5,135,182	[1]	(179,899,377)	[2]
Decrease (Increase) in receivable on futures contracts		(34,668,088)		(3,368,120)	[1]	(14,207,535)	[2]
Decrease (Increase) in receivable in Limitation by Sponsor		59,651		(59,651)	[1]
Decrease (Increase) in interest receivable		(555,187)
Cash paid for offering costs	[1]			(343,794)
Amortization of offering costs		105,643		238,151	[1]
Increase (Decrease) in payable to Sponsor		(968,109)		(213,033)	[1]	(116,609)	[2]
Increase (Decrease) in brokerage commissions and fees payable				(2,909)	[1]	(36,239)	[2]
Increase (Decrease) in payable on futures contracts		30,119,414		(2,017,981)	[1]	894,352	[2]
Net cash provided by (used in) operating activities		201,689,570		133,776,277	[1]	1,114,368,194	[2]
Cash flow from financing activities
Proceeds from addition of shares		6,196,623,015		9,097,496,596	[1]	10,681,055,123	[2]
Payment on shares redeemed		(5,783,407,073)		(8,967,195,585)	[1]	(9,656,124,409)	[2]
Net cash provided by (used in) financing activities		413,215,942		130,301,011	[1]	1,024,930,714	[2]
Net increase (decrease) in cash		614,905,512		264,077,288	[1]	(89,437,480)	[2]
Cash, beginning of period		483,772,745	[1]	219,695,457	[1],[2]	309,132,937	[2]
Cash, end of period		1,098,678,257		483,772,745	[1]	219,695,457	[1],[2]
ProShares Short Euro [Member]
Cash flow from operating activities
Net income (loss)		627,806		(1,499,567)		430,553
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		(371,708,641)		(52,920,382)		(53,315,548)
Proceeds from sales or maturities of short-term U.S government and agency obligations		378,200,000		59,163,769		55,336,935
Net amortization and accretion on short-term U.S government and agency obligations		(94,195)		(75,559)		(32,959)
Net realized gain (loss) on investments				384		(33)
Change in unrealized appreciation/depreciation on investments		(358)		381		(12)
Decrease (Increase) in receivable on futures contracts						84,235
Decrease (Increase) in interest receivable		(7,641)
Increase (Decrease) in payable to Sponsor		453		(6,149)		(1,409)
Increase (Decrease) in payable on futures contracts		(38,061)		(33,355)		76,666
Net cash provided by (used in) operating activities		6,979,363		4,629,522		2,578,428
Cash flow from financing activities
Proceeds from addition of shares						2,109,382
Payment on shares redeemed				(6,278,641)		(4,280,745)
Net cash provided by (used in) financing activities				(6,278,641)		(2,171,363)
Net increase (decrease) in cash		6,979,363		(1,649,119)		407,065
Cash, beginning of period		1,045,493		2,694,612		2,287,547
Cash, end of period		8,024,856		1,045,493		2,694,612
ProShares Short VIX Short-Term Futures ETF [Member]
Cash flow from operating activities
Net income (loss)		(1,919,498,972)		919,321,029		413,920,019
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		(23,270,517,650)		(7,250,717,757)		(2,915,165,614)
Proceeds from sales or maturities of short-term U.S government and agency obligations		23,768,116,025		6,931,640,345		3,281,269,459
Net amortization and accretion on short-term U.S government and agency obligations		(2,894,979)		(5,493,799)		(1,126,057)
Net realized gain (loss) on investments		259,113		443		11,670
Change in unrealized appreciation/depreciation on investments		(51,865)		56,560		6,824
Decrease (Increase) in receivable on futures contracts		(42,542,039)		(19,699,432)		(1,059,418)
Decrease (Increase) in interest receivable		(142,222)
Increase (Decrease) in payable to Sponsor		(530,173)		597,228		(277,306)
Increase (Decrease) in payable on futures contracts		14,919,287		203,750		(1,095,271)
Net cash provided by (used in) operating activities		(1,452,883,475)		575,908,367		776,484,306
Cash flow from financing activities
Proceeds from addition of shares		2,433,234,181		3,985,678,031		2,877,792,848
Payment on shares redeemed		(984,120,527)		(4,318,092,866)		(3,725,781,791)
Net cash provided by (used in) financing activities		1,449,113,654		(332,414,835)		(847,988,943)
Net increase (decrease) in cash		(3,769,821)		243,493,532		(71,504,637)
Cash, beginning of period		300,668,276		57,174,744		128,679,381
Cash, end of period		296,898,455		300,668,276		57,174,744
ProShares Ultra Bloomberg Crude Oil [Member]
Cash flow from operating activities
Net income (loss)		(136,181,929)		34,010,004		218,419,388
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		(15,528,795,124)		(6,401,999,444)		(3,746,504,691)
Proceeds from sales or maturities of short-term U.S government and agency obligations		15,714,465,442		6,833,376,973		3,661,263,949
Net amortization and accretion on short-term U.S government and agency obligations		(6,627,281)		(5,888,775)		(2,170,633)
Net realized gain (loss) on investments		2,307		14,496		17,374
Change in unrealized appreciation/depreciation on investments		134,973,144		(6,848,935)		(127,540,623)
Decrease (Increase) in receivable on futures contracts		2,051,561		(2,242,001)		5,150,763
Decrease (Increase) in interest receivable		(62,514)
Increase (Decrease) in payable to Sponsor		(128,585)		(397,278)		176,115
Increase (Decrease) in brokerage commissions and fees payable				(2,332)		(22,668)
Increase (Decrease) in payable on futures contracts		311,815		(1,993,438)		1,993,438
Net cash provided by (used in) operating activities		180,008,836		448,029,270		10,782,412
Cash flow from financing activities
Proceeds from addition of shares		505,144,772		1,156,816,574		1,099,498,953
Payment on shares redeemed		(547,464,799)		(1,616,527,496)		(1,139,850,399)
Net cash provided by (used in) financing activities		(42,320,027)		(459,710,922)		(40,351,446)
Net increase (decrease) in cash		137,688,809		(11,681,652)		(29,569,034)
Cash, beginning of period		10,329,503		22,011,155		51,580,189
Cash, end of period		148,018,312		10,329,503		22,011,155
ProShares Ultra Bloomberg Natural Gas [Member]
Cash flow from operating activities
Net income (loss)		3,642,120		(36,341,452)		13,409,647
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		(1,789,009,201)		(400,640,972)		(136,277,314)
Proceeds from sales or maturities of short-term U.S government and agency obligations		1,831,997,907		386,173,028		126,972,823
Net amortization and accretion on short-term U.S government and agency obligations		(405,867)		(313,279)		(72,943)
Net realized gain (loss) on investments		31		1,021		698
Change in unrealized appreciation/depreciation on investments		(1,941)		2,494		819
Decrease (Increase) in receivable on futures contracts		1,520,156		(1,520,156)		3,065,769
Decrease (Increase) in interest receivable		(11,508)
Increase (Decrease) in payable to Sponsor		(19,992)		8,069		10,926
Increase (Decrease) in brokerage commissions and fees payable				(433)		(3,190)
Increase (Decrease) in payable on futures contracts		3,309,741		(1,528,005)		1,528,005
Net cash provided by (used in) operating activities		51,021,446		(54,159,685)		8,635,240
Cash flow from financing activities
Proceeds from addition of shares		51,682,061		105,678,154		40,783,818
Payment on shares redeemed		(110,389,802)		(45,385,784)		(49,841,263)
Net cash provided by (used in) financing activities		(58,707,741)		60,292,370		(9,057,445)
Net increase (decrease) in cash		(7,686,295)		6,132,685		(422,205)
Cash, beginning of period		14,716,897		8,584,212		9,006,417
Cash, end of period		7,030,602		14,716,897		8,584,212
ProShares Ultra Euro [Member]
Cash flow from operating activities
Net income (loss)		(1,238,854)		3,020,144		(1,113,834)
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		(444,810,526)		(57,793,329)		(48,066,675)
Proceeds from sales or maturities of short-term U.S government and agency obligations		450,399,612		62,783,137		47,805,780
Net amortization and accretion on short-term U.S government and agency obligations		(89,149)		(94,761)		(25,015)
Net realized gain (loss) on investments		(7)		87		(154)
Change in unrealized appreciation/depreciation on investments		205,861		(837,700)		1,178,425
Decrease (Increase) in interest receivable		(6,718)
Increase (Decrease) in payable to Sponsor		(1,283)		(2,331)		(415)
Net cash provided by (used in) operating activities		4,458,936		7,075,247		(221,888)
Cash flow from financing activities
Proceeds from addition of shares		2,653,492		25,220,169		4,628,749
Payment on shares redeemed		(3,461,585)		(30,563,382)		(4,027,778)
Net cash provided by (used in) financing activities		(808,093)		(5,343,213)		600,971
Net increase (decrease) in cash		3,650,843		1,732,034		379,083
Cash, beginning of period		2,338,427		606,393		227,310
Cash, end of period		5,989,270		2,338,427		606,393
ProShares Ultra Gold [Member]
Cash flow from operating activities
Net income (loss)		(6,039,361)		19,445,233		2,966,147
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Purchases of short-term U.S. government and agency obligations		(4,562,780,642)		(909,157,323)		(406,481,915)
Proceeds from sales or maturities of short-term U.S government and agency obligations		4,611,119,917		916,390,856		383,282,007
Net amortization and accretion on short-term U.S government and agency obligations		(1,390,287)		(766,506)		(249,321)
Net realized gain (loss) on investments		172		(691)		806
Change in unrealized appreciation/depreciation on investments		(612,996)		(8,072,021)		2,184,901
Decrease (Increase) in receivable on futures contracts		2,420		(2,420)		80
Decrease (Increase) in interest receivable		(15,303)
Increase (Decrease) in payable to Sponsor		(6,331)		(1,811)		15,554
Increase (Decrease) in payable on futures contracts		7,990		(1,280)		1,280
Net cash provided by (used in) operating activities		40,285,579		17,834,037		(18,280,461)
Cash flow from financing activities
Proceeds from addition of shares		20,994,687		23,949,465		41,599,776
Payment on shares redeemed		(21,428,126)		(41,813,150)		(22,303,538)
Net cash provided by (used in) financing activities		(433,439)		(17,863,685)		19,296,238
Net increase (decrease) in cash		39,852,140		(29,648)		1,015,777
Cash, beginning of period		1,245,903		1,275,551		259,774
Cash, end of period		41,098,043		1,245,903		1,275,551
ProShares Ultra Silver [Member]
Cash flow from operating activities
Net income (loss)		(51,089,365)		10,539,992		61,734,685
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		(7,425,415,370)		(2,227,503,877)		(1,412,194,485)
Proceeds from sales or maturities of short-term U.S government and agency obligations		7,540,649,737		2,289,337,181		1,356,640,583
Net amortization and accretion on short-term U.S government and agency obligations		(3,423,994)		(2,142,126)		(842,217)
Net realized gain (loss) on investments		1,203		(207)		(145)
Change in unrealized appreciation/depreciation on investments		(4,592,049)		(42,683,411)		(1,589,821)
Decrease (Increase) in receivable on futures contracts		2,220		(2,220)
Decrease (Increase) in interest receivable		(16,306)
Increase (Decrease) in payable to Sponsor		(37,038)		(34,624)		40,213
Increase (Decrease) in payable on futures contracts		47,576		(2,290)		415
Net cash provided by (used in) operating activities		56,126,614		27,508,418		3,789,228
Cash flow from financing activities
Proceeds from addition of shares		56,650,169		50,514,699		104,165,405
Payment on shares redeemed		(65,335,975)		(75,235,084)		(106,536,792)
Net cash provided by (used in) financing activities		(8,685,806)		(24,720,385)		(2,371,387)
Net increase (decrease) in cash		47,440,808		2,788,033		1,417,841
Cash, beginning of period		4,466,934		1,678,901		261,060
Cash, end of period		51,907,742		4,466,934		1,678,901
ProShares Ultra VIX Short-Term Futures ETF [Member]
Cash flow from operating activities
Net income (loss)		452,499,741		(1,052,171,730)		(1,596,157,063)
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		(15,074,656,207)		(4,416,383,420)		(4,242,730,514)
Proceeds from sales or maturities of short-term U.S government and agency obligations		15,363,705,730		4,566,387,313		4,248,037,733
Net amortization and accretion on short-term U.S government and agency obligations		(1,510,857)		(2,896,165)		(1,634,060)
Net realized gain (loss) on investments		7,731		21,942		(15,949)
Change in unrealized appreciation/depreciation on investments		1,317,684		8,993		28,844
Decrease (Increase) in receivable on futures contracts		6,171,434		18,388,740		(17,971,713)
Decrease (Increase) in interest receivable		(106,307)
Increase (Decrease) in payable to Sponsor		(141,390)		(79,981)		(3,115)
Increase (Decrease) in payable on futures contracts		6,745,146
Net cash provided by (used in) operating activities		754,032,705		(886,724,308)		(1,610,445,837)
Cash flow from financing activities
Proceeds from addition of shares		2,220,909,974		2,602,472,951		4,573,362,937
Payment on shares redeemed		(2,860,773,004)		(1,709,331,303)		(2,952,014,084)
Net cash provided by (used in) financing activities		(639,863,030)		893,141,648		1,621,348,853
Net increase (decrease) in cash		114,169,675		6,417,340		10,903,016
Cash, beginning of period		88,750,920		82,333,580		71,430,564
Cash, end of period		202,920,595		88,750,920		82,333,580
ProShares Ultra Yen [Member]
Cash flow from operating activities
Net income (loss)		40,871		239,034		67,308
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		(41,486,414)		(16,968,159)		(28,924,289)
Proceeds from sales or maturities of short-term U.S government and agency obligations		43,500,000		20,281,603		28,727,215
Net amortization and accretion on short-term U.S government and agency obligations		(15,370)		(28,639)		(16,858)
Net realized gain (loss) on investments				83		34
Change in unrealized appreciation/depreciation on investments		(212,218)		(307,194)		603,897
Decrease (Increase) in interest receivable		(3,941)
Increase (Decrease) in payable to Sponsor		131		(2,225)		212
Net cash provided by (used in) operating activities		1,823,059		3,214,503		457,519
Cash flow from financing activities
Payment on shares redeemed				(2,915,722)		(199)
Net cash provided by (used in) financing activities				(2,915,722)		(199)
Net increase (decrease) in cash		1,823,059		298,781		457,320
Cash, beginning of period		903,472		604,691		147,371
Cash, end of period		2,726,531		903,472		604,691
Proshares UltraPro 3x Crude Oil ETF [Member]
Cash flow from operating activities
Net income (loss)		(62,342,439)		7,317,098	[3]
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Purchases of short-term U.S. government and agency obligations		(2,621,719,773)
Proceeds from sales or maturities of short-term U.S government and agency obligations		2,601,000,000
Net amortization and accretion on short-term U.S government and agency obligations		(259,227)
Change in unrealized appreciation/depreciation on investments		(876)
Decrease (Increase) in receivable on futures contracts		(262,447)		(289,395)	[3]
Decrease (Increase) in receivable in Limitation by Sponsor		24,342		(24,342)	[3]
Decrease (Increase) in interest receivable		(17,308)
Cash paid for offering costs	[3]			(171,927)
Amortization of offering costs		52,846		119,081	[3],[4]
Increase (Decrease) in payable to Sponsor		61,498
Net cash provided by (used in) operating activities		(83,463,384)		6,950,515	[3]
Cash flow from financing activities
Proceeds from addition of shares		183,406,337		40,659,738	[3]
Payment on shares redeemed		(47,329,487)		(36,641,353)	[3]
Net cash provided by (used in) financing activities		136,076,850		4,018,385	[3]
Net increase (decrease) in cash		52,613,466		10,968,900	[3]
Cash, beginning of period	[3]	10,968,900
Cash, end of period		63,582,366		10,968,900	[3]
ProShares UltraPro 3X Short Crude Oil ETF [Member]
Cash flow from operating activities
Net income (loss)		17,276,220		(10,145,373)	[3]
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		(1,258,898,672)
Proceeds from sales or maturities of short-term U.S government and agency obligations		1,259,000,000
Net amortization and accretion on short-term U.S government and agency obligations		(101,328)
Decrease (Increase) in receivable in Limitation by Sponsor		35,309		(35,309)	[3]
Decrease (Increase) in interest receivable		(13,748)
Cash paid for offering costs	[3]			(171,867)
Amortization of offering costs		52,797		119,070	[3],[4]
Increase (Decrease) in payable to Sponsor		18,496
Increase (Decrease) in payable on futures contracts		(437,716)		527,098	[3]
Net cash provided by (used in) operating activities		16,931,358		(9,706,381)	[3]
Cash flow from financing activities
Proceeds from addition of shares		62,030,238		38,429,372	[3]
Payment on shares redeemed		(81,802,535)		(7,122,823)	[3]
Net cash provided by (used in) financing activities		(19,772,297)		31,306,549	[3]
Net increase (decrease) in cash		(2,840,939)		21,600,168	[3]
Cash, beginning of period	[3]	21,600,168
Cash, end of period		18,759,229		21,600,168	[3]
ProShares UltraShort Australian Dollar [Member]
Cash flow from operating activities
Net income (loss)		1,570,978		(2,990,001)		(1,329,472)
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		(304,025,708)		(88,399,815)		(51,162,005)
Proceeds from sales or maturities of short-term U.S government and agency obligations		315,798,003		89,408,839		56,705,513
Net amortization and accretion on short-term U.S government and agency obligations		(87,192)		(84,205)		(43,459)
Net realized gain (loss) on investments		247		178		(495)
Change in unrealized appreciation/depreciation on investments		(983)		718		(279)
Decrease (Increase) in receivable on futures contracts		(6,300)				52,491
Decrease (Increase) in interest receivable		(8,475)
Increase (Decrease) in payable to Sponsor		(2,889)		(1,706)		(3,812)
Increase (Decrease) in payable on futures contracts		(52,950)		20,610		32,340
Net cash provided by (used in) operating activities		13,184,731		(2,045,382)		4,250,822
Cash flow from financing activities
Proceeds from addition of shares		5,028,505		4,801,797
Payment on shares redeemed		(9,241,252)		(4,723,167)		(2,517,734)
Net cash provided by (used in) financing activities		(4,212,747)		78,630		(2,517,734)
Net increase (decrease) in cash		8,971,984		(1,966,752)		1,733,088
Cash, beginning of period		1,782,397		3,749,149		2,016,061
Cash, end of period		10,754,381		1,782,397		3,749,149
ProShares UltraShort Bloomberg Crude Oil [Member]
Cash flow from operating activities
Net income (loss)		17,510,057		(27,805,142)		(91,674,345)
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		(6,792,763,547)		(2,520,968,339)		(1,099,847,442)
Proceeds from sales or maturities of short-term U.S government and agency obligations		7,020,979,617		2,474,635,036		974,343,507
Net amortization and accretion on short-term U.S government and agency obligations		(2,513,939)		(1,641,472)		(500,160)
Net realized gain (loss) on investments		(103)		448		4,064
Change in unrealized appreciation/depreciation on investments		(51,276,607)		18,422,150		18,617,825
Decrease (Increase) in receivable on futures contracts		(432,627)
Decrease (Increase) in interest receivable		(36,428)
Increase (Decrease) in payable to Sponsor		(102,279)		27,810		61,748
Increase (Decrease) in brokerage commissions and fees payable						(8,453)
Increase (Decrease) in payable on futures contracts		(645,187)		680,185		(837,281)
Net cash provided by (used in) operating activities		190,718,957		(56,649,324)		(199,840,537)
Cash flow from financing activities
Proceeds from addition of shares		221,565,466		510,910,744		1,002,034,810
Payment on shares redeemed		(376,000,381)		(458,220,621)		(805,300,056)
Net cash provided by (used in) financing activities		(154,434,915)		52,690,123		196,734,754
Net increase (decrease) in cash		36,284,042		(3,959,201)		(3,105,783)
Cash, beginning of period		3,688,091		7,647,292		10,753,075
Cash, end of period		39,972,133		3,688,091		7,647,292
ProShares UltraShort Bloomberg Natural Gas [Member]
Cash flow from operating activities
Net income (loss)		(2,217,465)		4,092,401		2,456,572
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		(695,820,495)		(98,949,414)		(46,397,398)
Proceeds from sales or maturities of short-term U.S government and agency obligations		699,600,000		97,881,796		51,635,055
Net amortization and accretion on short-term U.S government and agency obligations		(79,553)		(33,644)		(19,053)
Net realized gain (loss) on investments				783		(3,139)
Change in unrealized appreciation/depreciation on investments		85		(121)		388
Decrease (Increase) in receivable on futures contracts		(3,096,239)		105,872		(105,872)
Decrease (Increase) in interest receivable		(11,379)
Increase (Decrease) in payable to Sponsor		13,415		(261)		(7,499)
Increase (Decrease) in brokerage commissions and fees payable				(144)		(1,764)
Increase (Decrease) in payable on futures contracts		(104,104)		104,104		(785,170)
Net cash provided by (used in) operating activities		(1,715,735)		3,201,372		6,772,120
Cash flow from financing activities
Proceeds from addition of shares		53,822,972		23,216,158		40,020,426
Payment on shares redeemed		(36,361,221)		(24,444,610)		(48,901,060)
Net cash provided by (used in) financing activities		17,461,751		(1,228,452)		(8,880,634)
Net increase (decrease) in cash		15,746,016		1,972,920		(2,108,514)
Cash, beginning of period		3,010,206		1,037,286		3,145,800
Cash, end of period		18,756,222		3,010,206		1,037,286
ProShares UltraShort Euro [Member]
Cash flow from operating activities
Net income (loss)		25,147,085		(62,619,643)		16,410,009
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Purchases of short-term U.S. government and agency obligations		(5,771,042,956)		(2,213,830,667)		(1,535,809,146)
Proceeds from sales or maturities of short-term U.S government and agency obligations		5,856,785,001		2,348,460,695		1,745,625,938
Net amortization and accretion on short-term U.S government and agency obligations		(2,752,893)		(2,048,455)		(1,012,886)
Net realized gain (loss) on investments		219		3,785		(242)
Change in unrealized appreciation/depreciation on investments		(4,869,355)		22,527,463		(44,885,942)
Decrease (Increase) in interest receivable		(15,999)
Increase (Decrease) in payable to Sponsor		(42,899)		(119,503)		(123,177)
Net cash provided by (used in) operating activities		103,208,203		92,373,675		180,204,554
Cash flow from financing activities
Proceeds from addition of shares		37,244,830		54,352,755		15,418,329
Payment on shares redeemed		(108,392,933)		(145,349,037)		(203,078,964)
Net cash provided by (used in) financing activities		(71,148,103)		(90,996,282)		(187,660,635)
Net increase (decrease) in cash		32,060,100		1,377,393		(7,456,081)
Cash, beginning of period		4,293,895		2,916,502		10,372,583
Cash, end of period		36,353,995		4,293,895		2,916,502
ProShares UltraShort Gold [Member]
Cash flow from operating activities
Net income (loss)		1,967,739		(11,603,901)		(11,462,140)
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		(1,471,021,129)		(259,713,980)		(320,273,448)
Proceeds from sales or maturities of short-term U.S government and agency obligations		1,499,398,357		288,557,288		332,879,016
Net amortization and accretion on short-term U.S government and agency obligations		(387,225)		(283,867)		(164,568)
Net realized gain (loss) on investments		(152)		1,208		378
Change in unrealized appreciation/depreciation on investments		(498,987)		4,523,831		(1,226,652)
Decrease (Increase) in receivable on futures contracts		(1,700)		1,280		(1,280)
Decrease (Increase) in interest receivable		(10,500)
Increase (Decrease) in payable to Sponsor		(9,944)		(30,538)		(4,097)
Increase (Decrease) in payable on futures contracts		(2,420)		2,420		(80)
Net cash provided by (used in) operating activities		29,434,039		21,453,741		(252,871)
Cash flow from financing activities
Proceeds from addition of shares		16,527,151		26,178,336		83,353,994
Payment on shares redeemed		(31,893,303)		(46,730,672)		(83,209,971)
Net cash provided by (used in) financing activities		(15,366,152)		(20,552,336)		144,023
Net increase (decrease) in cash		14,067,887		901,405		(108,848)
Cash, beginning of period		1,035,445		134,040		242,888
Cash, end of period		15,103,332		1,035,445		134,040
ProShares UltraShort Silver [Member]
Cash flow from operating activities
Net income (loss)		5,018,226		(2,017,008)		(21,184,809)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Purchases of short-term U.S. government and agency obligations		(906,025,439)		(205,796,774)		(149,552,689)
Proceeds from sales or maturities of short-term U.S government and agency obligations		921,367,007		209,150,487		178,824,533
Net amortization and accretion on short-term U.S government and agency obligations		(285,580)		(157,687)		(93,482)
Net realized gain (loss) on investments		2,031		932		1,916
Change in unrealized appreciation/depreciation on investments		73,924		3,103,909		3,393,666
Decrease (Increase) in receivable on futures contracts				2,290		(1,900)
Decrease (Increase) in interest receivable		(7,847)
Increase (Decrease) in payable to Sponsor		(5,971)		(2,464)		(27,635)
Increase (Decrease) in payable on futures contracts		3,500		2,220
Net cash provided by (used in) operating activities		20,139,851		4,285,905		11,359,600
Cash flow from financing activities
Proceeds from addition of shares		27,656,086		26,717,920		69,113,968
Payment on shares redeemed		(38,883,485)		(29,740,532)		(80,899,441)
Net cash provided by (used in) financing activities		(11,227,399)		(3,022,612)		(11,785,473)
Net increase (decrease) in cash		8,912,452		1,263,293		(425,873)
Cash, beginning of period		1,363,644		100,351		526,224
Cash, end of period		10,276,096		1,363,644		100,351
ProShares UltraShort Yen [Member]
Cash flow from operating activities
Net income (loss)		(1,920,781)		(24,316,599)		6,821,473
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Purchases of short-term U.S. government and agency obligations		(3,738,985,179)		(1,735,928,862)		(1,044,852,917)
Proceeds from sales or maturities of short-term U.S government and agency obligations		3,837,199,781		1,862,630,186		1,048,290,293
Net amortization and accretion on short-term U.S government and agency obligations		(1,320,754)		(1,446,842)		(531,771)
Net realized gain (loss) on investments		(3)		4,001		5,910
Change in unrealized appreciation/depreciation on investments		4,640,285		15,227,152		(30,657,216)
Decrease (Increase) in interest receivable		(14,973)
Increase (Decrease) in payable to Sponsor		(57,826)		(125,628)		21,603
Net cash provided by (used in) operating activities		99,540,550		116,043,408		(20,902,625)
Cash flow from financing activities
Proceeds from addition of shares		7,078,646		76,657,434		150,763,218
Payment on shares redeemed		(84,631,626)		(194,285,146)		(126,970,573)
Net cash provided by (used in) financing activities		(77,552,980)		(117,627,712)		23,792,645
Net increase (decrease) in cash		21,987,570		(1,584,304)		2,890,020
Cash, beginning of period		1,582,684		3,166,988		276,968
Cash, end of period		23,570,254		1,582,684		3,166,988
ProShares VIX Mid-Term Futures ETF [Member]
Cash flow from operating activities
Net income (loss)		10,422,181		(26,328,548)		(12,324,462)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Purchases of short-term U.S. government and agency obligations		(2,159,804,178)		(943,753,668)		(175,738,460)
Proceeds from sales or maturities of short-term U.S government and agency obligations		2,181,000,000		968,489,510		156,335,340
Net amortization and accretion on short-term U.S government and agency obligations		(202,494)		(243,058)		(107,408)
Net realized gain (loss) on investments				377		(499)
Change in unrealized appreciation/depreciation on investments		187		(441)		1,079
Decrease (Increase) in receivable on futures contracts		170,015		72,526		(200,353)
Decrease (Increase) in interest receivable		(29,104)
Increase (Decrease) in payable to Sponsor		8,449		(8,941)		12,194
Increase (Decrease) in payable on futures contracts		565,495
Net cash provided by (used in) operating activities		32,130,551		(1,772,243)		(32,022,569)
Cash flow from financing activities
Proceeds from addition of shares		56,218,143		26,311,779		55,230,587
Payment on shares redeemed		(37,072,628)		(20,480,908)		(22,652,829)
Net cash provided by (used in) financing activities		19,145,515		5,830,871		32,577,758
Net increase (decrease) in cash		51,276,066		4,058,628		555,189
Cash, beginning of period		6,266,358		2,207,730		1,652,541
Cash, end of period		57,542,424		6,266,358		2,207,730
ProShares VIX Short-Term Futures ETF [Member]
Cash flow from operating activities
Net income (loss)		112,422,941		(198,604,105)		(196,292,805)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Purchases of short-term U.S. government and agency obligations		(5,723,838,427)		(1,819,678,736)		(920,726,003)
Proceeds from sales or maturities of short-term U.S government and agency obligations		5,744,914,327		1,834,013,986		869,284,481
Net amortization and accretion on short-term U.S government and agency obligations		(1,002,455)		(1,201,747)		(466,392)
Net realized gain (loss) on investments		1,992		772		(6,650)
Change in unrealized appreciation/depreciation on investments		(14,835)		11,354		(3,010)
Decrease (Increase) in receivable on futures contracts		1,755,458		1,816,796		(3,220,337)
Decrease (Increase) in interest receivable		(16,966)
Increase (Decrease) in payable to Sponsor		16,049		(32,700)		10,220
Increase (Decrease) in payable on futures contracts		5,489,302
Net cash provided by (used in) operating activities		139,727,386		(183,674,380)		(251,420,496)
Cash flow from financing activities
Proceeds from addition of shares		234,775,305		318,930,520		515,131,303
Payment on shares redeemed		(338,824,404)		(153,313,288)		(249,951,175)
Net cash provided by (used in) financing activities		(104,049,099)		165,617,232		265,180,128
Net increase (decrease) in cash		35,678,287		(18,057,148)		13,759,632
Cash, beginning of period		3,715,132		21,772,280		8,012,648
Cash, end of period		$ 39,393,419		$ 3,715,132		$ 21,772,280
[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]	Since the Fund's inception date was January 13, 2017, the Statement of Cash Flows for the year ended December 31, 2016 has not been provided.
[4]	Since the Fund's inception date was January 13, 2017, the Statement of Operations for the year ended December 31, 2016 has not been provided.

Organization

Organization	12 Months Ended
	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	NOTE 1 - ORGANIZATION ProShares Trust II (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, 2018, 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,” “UltraPro Short 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. 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 changed its investment objective to seek daily investment results, before fees and expenses, that correspond to one and one-half ProShares Short VIX Short-Term Futures ETF changed its investment objective to seek daily investment results, before fees and expenses, that correspond to one-half (-0.5x) (-1x) Each Short Fund seeks daily investment results, before fees and expenses, that correspond to either one-half (-0.5x) (-1x) (-2x) (-3x) one-half The Geared Funds do not seek to achieve their stated investment objectives 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., -0.5x, -1x, -2x, -3x, 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, 2016, 2017, and 2018. 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 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 ProShares Ultra Bloomberg Natural Gas March 19, 2018 1-for-5 March 20, 2018 ProShares UltraPro 3x Short Crude Oil ETF March 19, 2018 1-for-4 March 20, 2018 ProShares Short VIX Short-Term Futures ETF September 17, 2018 1-for-4 September 18, 2018 ProShares Ultra VIX Short-Term Futures ETF September 17, 2018 1-for-5 September 18, 2018 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, 2018
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, 2018 and 2017, and represents cash, segregated cash balances with brokers for futures contracts, segregated cash with brokers for swap agreements, segregated cash with brokers for forward agreements, and segregated cash with brokers for foreign currency forward agreements but does not include short-term investments. Final Net Asset Value for Fiscal Period The cut-off Fund Create/Redeem Cut-off* NAV Calculation Time NAV Calculation Date ProShares UltraShort Silver, ProShares 6:30 a.m. 7:00 a.m. December 31, 2018 ProShares UltraShort Gold, ProShares 9:30 a.m. 10:00 a.m. December 31, 2018 ProShares UltraShort Bloomberg Crude Oil, ProShares Ultra Bloomberg Crude Oil, 2:00 p.m. 2:30 p.m. December 31, 2018 ProShares UltraPro 3x Short Crude Oil ETF, ProShares UltraPro 3x Crude Oil ETF ProShares UltraShort Bloomberg Natural Gas, ProShares Ultra Bloomberg Natural Gas 2:00 p.m. 2:30 p.m. December 31, 2018 ProShares UltraShort Australian Dollar 3:00 p.m. 4:00 p.m. December 31, 2018 ProShares Short Euro ProShares UltraShort Euro, ProShares Ultra Euro 3:00 p.m. 4:00 p.m. December 31, 2018 ProShares UltraShort Yen, ProShares Ultra Yen 3:00 p.m. 4:00 p.m. December 31, 2018 ProShares VIX Short-Term Futures ETF, ProShares Ultra VIX Short-Term Futures ETF, ProShares Short VIX Short-Term Futures ETF 2:00 p.m. 4:15 p.m. December 31, 2018 ProShares VIX Mid-Term 2:00 p.m. 4:15 p.m. December 31, 2018 * 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, 2018. 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, 2018. 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., futures contracts, swap agreements, forward agreements and foreign currency forward contracts) are generally valued using independent sources and/or agreements with counterparties or other procedures as determined by the Sponsor. Futures contracts, except for those entered into by the Gold, Silver, Australian Dollar and Short Euro Funds, are generally valued at the last settled price on the applicable exchange on which that future trades. Futures contracts entered into by the Gold, Silver, Australian Dollar and Short Euro Funds are generally valued at the last sales price prior to the time at which the NAV per Share of a Fund is determined. For financial reporting purposes, all futures contracts are generally valued at the last settled price. Futures contracts valuations are typically categorized as Level I in the fair value hierarchy. Swap agreements, forward agreements and foreign currency forward contracts valuations are typically categorized as Level II in the fair value hierarchy. The Sponsor may in its sole discretion choose to determine a fair value price as the basis for determining the market value of such position. Such fair value prices would generally be determined based on available inputs about the current value of the underlying financial instrument or commodity and would be based on principles that the Sponsor deems fair and equitable so long as such principles are consistent with industry standards. The Sponsor may fair value an asset of a Fund pursuant to the policies the Sponsor has adopted. Depending on the source and relevant significance of valuation inputs, these instruments may be classified as Level II or Level III in the fair value hierarchy. 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, 2018 using the fair value hierarchy: Level I - Quoted Prices Level II - Other Significant Observable Inputs Fund Short-Term U.S. Government and Agencies Futures Contracts * Forward Agreements Foreign Currency Forward Contracts Swap Agreements Total ProShares Short Euro $ 599,429 $ (43,281 ) $ — $ — $ — $ 556,148 ProShares Short VIX Short-Term Futures ETF — (14,476,201 ) — — — (14,476,201 ) ProShares Ultra Bloomberg Crude Oil 280,502,900 (14,040,301 ) — — (72,767,125 ) 193,695,474 ProShares Ultra Bloomberg Natural Gas 8,380,427 (10,323,163 ) — — — (1,942,736 ) ProShares Ultra Euro 1,496,658 — — 57,938 — 1,554,596 ProShares Ultra Gold 41,941,734 72,670 4,253,301 — — 46,267,705 ProShares Ultra Silver 123,795,806 340,736 26,301,717 — — 150,438,259 ProShares Ultra VIX Short-Term Futures ETF — 32,503,965 — — (1,330,949 ) 31,173,016 ProShares Ultra Yen — — — 177,111 — 177,111 ProShares UltraPro 3x Crude Oil ETF 20,979,876 (23,451,361 ) — — — (2,471,485 ) ProShares UltraPro 3x Short Crude Oil ETF — 7,019,475 — — — 7,019,475 ProShares UltraShort Australian Dollar 299,537 511,825 — — — 811,362 ProShares UltraShort Bloomberg Crude Oil 27,967,534 3,272,155 — — 20,646,726 51,886,415 ProShares UltraShort Bloomberg Natural Gas 299,714 10,837,989 — — — 11,137,703 ProShares UltraShort Euro 121,801,685 — — (1,495,804 ) — 120,305,881 ProShares UltraShort Gold 3,989,563 (31,780 ) (990,786 ) — — 2,966,997 ProShares UltraShort Silver 3,294,766 (44,917 ) (1,793,011 ) — — 1,456,838 ProShares UltraShort Yen 34,951,229 — — (3,123,744 ) — 31,827,485 ProShares VIX Mid-Term — 3,758,106 — — — 3,758,106 ProShares VIX Short-Term Futures ETF 114,785,002 17,378,445 — — — 132,163,447 Total Trust $ 785,085,860 $ 13,284,362 $ 27,771,221 $ (4,384,499 ) $ (53,451,348 ) $ 768,305,596 * Incudes cumulative appreciation/depreciation of futures contracts as reported in the Schedule of Investments. Only current day’s variation margin is reported within the Statements of Financial Condition in receivable/payable on open futures. 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, 2017 using the fair value hierarchy: Level I - Quoted Prices Level II - Other Significant Observable Inputs Fund Short-Term U.S. Government and Agencies Futures Contracts * Forward Agreements Foreign Currency Forward Contracts Swap Agreements Total ProShares Short Euro $ 6,996,235 $ (166,288 ) $ — $ — $ — $ 6,829,947 ProShares Short VIX Short-Term Futures ETF 494,910,644 17,041,449 — — — 511,952,093 ProShares Ultra Bloomberg Crude Oil 459,515,902 11,945,979 — — 62,238,361 533,700,242 ProShares Ultra Bloomberg Natural Gas 50,961,356 7,225,810 — — — 58,187,166 ProShares Ultra Euro 6,996,235 — — 264,152 — 7,260,387 ProShares Ultra Gold 88,884,844 5,480 3,646,355 — — 92,536,679 ProShares Ultra Silver 235,581,716 1,600 21,735,334 — — 257,318,650 ProShares Ultra VIX Short-Term Futures ETF 287,533,132 (34,466,120 ) — — — 253,067,012 ProShares Ultra Yen 1,997,933 — — (34,824 ) — 1,963,109 ProShares UltraPro 3x Crude Oil ETF — 1,417,998 — — — 1,417,998 ProShares UltraPro 3x Short Crude Oil ETF — (2,988,155 ) — — — (2,988,155 ) ProShares UltraShort Australian Dollar 11,983,904 (893,220 ) — — — 11,090,684 ProShares UltraShort Bloomberg Crude Oil 253,646,823 (3,962,648 ) — — (30,607,142 ) 219,077,033 ProShares UltraShort Bloomberg Natural Gas 3,999,751 (1,097,049 ) — — — 2,902,702 ProShares UltraShort Euro 204,770,166 — — (6,344,269 ) — 198,425,897 ProShares UltraShort Gold 31,977,900 (5,460 ) (1,488,259 ) — — 30,484,181 ProShares UltraShort Silver 18,349,861 (1,650 ) (1,716,163 ) — — 16,632,048 ProShares UltraShort Yen 131,834,352 — — 1,527,263 — 133,361,615 ProShares VIX Mid-Term 20,993,515 (2,215,280 ) — — — 18,778,235 ProShares 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 * Incudes cumulative appreciation/depreciation of futures contracts as reported in the Schedule of Investments. Only current day’s variation margin is reported within the Statements of Financial Condition in receivable/payable on open futures. 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. Interest income is recognized on an accrual basis and includes, where applicable, the amortization of premium or discount, and is reflected as Interest Income in the Statement of Operations. Brokerage Commissions and Fees Each Fund pays its respective brokerage commissions, including applicable exchange fees, National Futures Association (“NFA”) fees, give-up 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., the last four tax year ends and the interim tax period since then, as applicable) and concluded that there is no tax liability resulting from unrecognized tax benefits relating to uncertain income tax positions taken or expected to be taken in future tax returns. The Funds are also not aware of any tax positions for which it is reasonably possible that the total amounts of unrecognized tax benefits will significantly change in the next twelve months. On an ongoing basis, management monitors its tax positions taken under the interpretation to determine if adjustments to conclusions are necessary based on factors including, but not limited to, on-going New Accounting Pronouncements In November 2016, the FASB issued Accounting Standards Update No. 2016-18, 2016-18”), In August 2018, the FASB issued Accounting Standards Update No. 2018-13, 2018-13”). 2018-13 2018-13

Investments

Investments	12 Months Ended
	Dec. 31, 2018
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, futures, and/or 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 objectives 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. As discussed in Note 1, the Short VIX Short-Term Futures ETF and the Ultra VIX Short-Term Futures ETF changed their investment objectives and target exposures as of the close of business on February 27, 2018. From this time through the effective end of the reporting period, the volume of the derivative exposure relative to the net assets was generally representative to their current investment objectives. From the beginning of the reporting period until the close of business on February 27, 2018, the volume of the derivative exposure relative to the net assets was generally representative to their previous investment objectives. 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 may 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 credit risk resides with the Funds’ clearing broker or clearinghouse itself. 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, an Ultra Fund, or an UltraPro Fund, the Matching VIX Fund, Ultra Fund, or UltraPro 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, an UltraShort Fund, or an UltraPro Short Fund, the Short Fund, UltraShort Fund, or UltraPro Short 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 OTC 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 OTC 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 a third party 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. Swap 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 to 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, 2018 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 OTC 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 OTC 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 a bankruptcy of a counterparty, such 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, 2018, 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 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 contracts 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 OTC 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, 2018, 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 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, 2018 Asset Derivatives Liability Derivatives Derivatives Not Fund Statements of Financial Condition Unrealized Appreciation Statements of Financial Condition Unrealized Depreciation VIX Futures Contracts Receivables on open futures contracts, unrealized appreciation on swap agreements Payable on open futures contracts, unrealized depreciation on swap agreements ProShares Short VIX Short-Term Futures ETF $ 910,460 * $ 15,386,661 * ProShares Ultra VIX Short-Term Futures ETF 33,798,582 * 2,625,566 * ProShares VIX Mid-Term 3,888,156 * 130,050 * ProShares VIX Short-Term Futures ETF 18,392,959 * 1,014,514 * Commodities Contracts Receivables on open futures contracts, unrealized appreciation on swap and/or forward agreements Payable on open futures contracts, unrealized depreciation on swap and/or forward agreements ProShares Ultra Bloomberg Crude Oil — 86,807,426 * ProShares Ultra Bloomberg Natural Gas — 10,323,163 * ProShares Ultra Gold 4,325,971 * — ProShares Ultra Silver 26,642,453 * — ProShares UltraPro 3x Crude Oil ETF — 23,451,361 * ProShares UltraPro 3x Short Crude Oil ETF 7,019,475 * — ProShares UltraShort Bloomberg Crude Oil 23,918,881 * — ProShares UltraShort Bloomberg Natural Gas 10,837,989 * — ProShares UltraShort Gold — 1,022,566 * ProShares UltraShort Silver — 1,837,928 * Foreign Exchange Contracts Unrealized appreciation on foreign currency forward contracts, and receivables on open futures contracts Unrealized depreciation on foreign currency forward contracts, and payable on open futures contracts ProShares Short Euro — 43,281 * ProShares Ultra Euro 61,971 4,033 ProShares Ultra Yen 179,187 2,076 ProShares UltraShort Australian Dollar 511,825 * — ProShares UltraShort Euro 104,074 1,599,878 ProShares UltraShort Yen 678,152 3,801,896 Total Trust $ 131,270,135 * $ 148,050,399 * * Incudes cumulative appreciation/depreciation of futures contracts as reported in the Schedule of Investments. Only current day’s variation margin is reported within the Statements of Financial Condition in receivable/payable on open futures. Fair Value of Derivative Instruments as of December 31, 2017 Asset Derivatives Liability Derivatives Derivatives Not Accounted for as Hedging Instruments Fund Statements of Financial Condition Location Unrealized Appreciation Statements of Financial Condition Location Unrealized Depreciation VIX Futures Contracts Receivables on open futures contracts Payable on open futures contracts ProShares Short VIX Short-Term Futures ETF $ 21,493,549 * $ 4,452,100 * ProShares Ultra VIX Short-Term Futures ETF 3,974,642 * 38,440,762 * ProShares VIX Mid-Term Futures ETF — 2,215,280 * ProShares VIX Short-Term Futures ETF 709,708 * 5,471,585 * Commodities Contracts Receivables on open futures contracts, unrealized appreciation on swap and/or forward agreements Payable on open futures contracts, unrealized depreciation on swap and/or forward agreements ProShares Ultra Bloomberg Crude Oil 74,184,340 * — ProShares Ultra Bloomberg Natural Gas 7,225,810 * — ProShares Ultra Gold 3,651,835 * — ProShares Ultra Silver 21,736,934 * — ProShares UltraPro 3x Crude Oil ETF 1,417,998 * — ProShares UltraPro 3x Short Crude Oil ETF — 2,988,155 * ProShares UltraShort Bloomberg Crude Oil — 34,569,790 * ProShares UltraShort Bloomberg Natural Gas — 1,097,049 * ProShares UltraShort Gold — 1,493,719 * ProShares UltraShort Silver — 1,717,813 * Foreign Exchange Contracts Unrealized appreciation on foreign currency forward contracts, and receivables on open futures contracts Unrealized depreciation on foreign currency forward contracts, and payable on open futures contracts ProShares Short Euro — 166,288 * ProShares Ultra Euro 321,609 57,457 ProShares UltraShort Australian Dollar — 893,220 * ProShares Ultra Yen — 34,824 ProShares UltraShort Euro 499,302 6,793,571 ProShares UltraShort Yen 1,568,997 41,734 Total Trust $ 136,784,724 * $ 100,433,347 * * Incudes cumulative appreciation/depreciation of futures contracts as reported in the Schedule of Investments. Only current day’s variation margin is reported within the Statements of Financial Condition in receivable/payable on open futures. The Effect of Derivative Instruments on the Statement of Operations For the Year December 31, 2018 Derivatives Not Accounted for as Hedging Instruments Location of Gain (Loss) on Derivatives Recognized in Income Fund Realized Gain (Loss) on Derivatives Recognized in Income Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income VIX Futures Contracts Net realized gain (loss) on futures contracts and/or swap agreements/ changes in unrealized appreciation/ depreciation on futures contracts and/or swap agreements ProShares Short VIX Short-Term $ (1,885,564,719 ) $ (31,517,650 ) ProShares Ultra VIX Short-Term Futures ETF 390,000,742 65,639,136 ProShares VIX Mid-Term 4,332,654 5,973,386 ProShares VIX Short-Term Futures ETF 89,903,111 22,140,322 Commodities 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 21,756,994 (160,991,766 ) ProShares Ultra Bloomberg Natural Gas 21,092,864 (17,548,973 ) ProShares Ultra Gold (7,345,006 ) 674,136 ProShares Ultra Silver (57,488,526 ) 4,905,519 ProShares UltraPro 3x Crude Oil ETF (37,435,672 ) (24,869,359 ) ProShares UltraPro 3x Short Crude Oil ETF 7,377,281 10,007,630 ProShares UltraShort Bloomberg Crude Oil (42,040,086 ) 58,488,671 ProShares UltraShort Bloomberg Natural Gas (14,147,964 ) 11,935,038 ProShares UltraShort Gold 1,323,579 471,153 ProShares UltraShort Silver 5,024,976 (120,115 ) 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 459,984 123,007 ProShares Ultra Euro (1,063,823 ) (206,214 ) ProShares Ultra Yen (170,364 ) 211,935 ProShares UltraShort Australian Dollar 128,451 1,405,045 ProShares UltraShort Euro 18,953,455 4,848,465 ProShares UltraShort Yen 2,111,627 (4,651,007 ) Total Trust $ (1,482,790,442 ) $ (53,081,641 ) 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 Derivatives Recognized in Income 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 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 Futures ETF (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 Derivatives Recognized in Income Fund Realized Gain (Loss) on Derivatives Recognized in Income 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 Ultra 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 5,816,562 (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 $ (1,319,878,687 ) $ 157,908,519 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, 2018. Fair Values of Derivative Instruments as of December 31, 2018 Assets Liabilities Fund Gross Amounts of Recognized Assets presented in the Statements of Financial Condition Gross Amounts Offset in the Statements of Financial Condition Net Amounts of Assets presented in the Statements of Financial Condition Gross Amounts of Recognized Liabilities presented in the Statements of Financial Condition Gross Amounts Offset in the Statements of Financial Condition Net Amounts of Liabilities presented in the Statements of Financial Condition ProShares Ultra Bloomberg Crude Oil Swap agreements $ — $ — $ — $ 72,767,125 $ — $ 72,767,125 ProShares Ultra Euro Foreign currency forward contracts 61,971 — 61,971 4,033 — 4,033 ProShares Ultra Gold Forward agreements 4,253,301 — 4,253,301 — — — ProShares Ultra Silver Forward agreements 26,301,717 — 26,301,717 — — — ProShares Ultra VIX Short-Term Futures ETF Swap agreements — — — 1,330,949 — 1,330,949 ProShares Ultra Yen Foreign currency forward contracts 179,187 — 179,187 2,076 — 2,076 ProShares UltraShort Bloomberg Crude Oil Swap agreements 20,646,726 — 20,646,726 — — — ProShares UltraShort Euro Foreign currency forward contracts 104,074 — 104,074 1,599,878 — 1,599,878 ProShares UltraShort Gold Forward agreements — — — 990,786 — 990,786 ProShares UltraShort Silver Forward agreements — — — 1,793,011 — 1,793,011 ProShares UltraShort Yen Foreign currency forward contracts 678,152 — 678,152 3,801,896 — 3,801,896 Asset (Liability) amounts shown in the table below represent amounts owed to (by) the Funds for the derivative-related investments at December 31, 2018. 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, 2018 Fund Amounts of Recognized Financial Instruments Cash Collateral for the Net Amount ProShares Ultra Bloomberg Crude Oil Citibank, N.A. $ (22,752,565 ) $ 20,667,565 $ 2,085,000 $ — Goldman Sachs International (15,691,687 ) 10,417,687 5,274,000 — Royal Bank of Canada (13,836,386 ) 13,836,386 — — Societe Generale (5,206,589 ) 1,491,589 3,715,000 — UBS AG (15,279,898 ) 15,156,898 123,000 — ProShares Ultra Euro Goldman Sachs International 26,209 — — 26,209 UBS AG 31,729 — — 31,729 ProShares Ultra Gold Citibank, N.A. 1,682,026 (1,682,026 ) — — Goldman Sachs International 1,223,528 (1,223,528 ) — — Societe Generale 61,260 — — 61,260 UBS AG 1,286,487 (1,286,487 ) — — ProShares Ultra Silver Citibank, N.A. 9,662,061 (8,053,860 ) — 1,608,201 Goldman Sachs International 8,418,745 (1,655,971 ) — 6,762,774 Societe Generale 118,797 — — 118,797 UBS AG 8,102,114 (6,971,401 ) — 1,130,713 ProShares Ultra VIX Short-Term Futures ETF Goldman Sachs International (1,330,949 ) — 1,330,949 — ProShares Ultra Yen Goldman Sachs International 73,705 — — 73,705 UBS AG 103,406 — — 103,406 ProShares UltraShort Bloomberg Crude Oil Citibank, N.A. 8,336,367 (8,336,367 ) — — Goldman Sachs International 2,752,372 (2,752,372 ) — — Royal Bank of Canada 4,237,960 — (4,237,960 ) — Societe Generale 1,891,050 (1,891,050 ) — — UBS AG 3,428,977 (3,428,977 ) — — ProShares UltraShort Euro Goldman Sachs International (610,002 ) 610,002 — — UBS AG (885,802 ) — 885,802 — ProShares UltraShort Gold Citibank, N.A. (380,655 ) 119,655 261,000 — Goldman Sachs International (258,134 ) — 258,134 — Societe Generale (63,076 ) — 63,076 — UBS AG (288,921 ) — 288,921 — ProShares UltraShort Silver Citibank, N.A. (566,050 ) — 566,050 — Goldman Sachs International (605,756 ) — 605,756 — Societe Generale (119,953 ) — 119,953 — UBS AG (501,252 ) — 501,252 — ProShares UltraShort Yen Goldman Sachs International (1,425,071 ) — 1,425,071 — UBS AG (1,698,673 ) 1,571,673 127,000 — 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 Amounts of Amounts of Recognized Gross Net Amounts of Recognized Gross Net Amounts of Assets Amounts Assets Liabilities Amounts Liabilities presented in Offset in the presented in presented in Offset in the presented in the Statements the Statements the Statements the Statements Statements the Statements of Financial of Financial of Financial of Financial of Financial of Financial Fund Condition Condition Condition Condition Condition Condition ProShares Ultra Bloomberg Crude Oil Swap agreements $ 62,238,361 $ — $ 62,238,361 $ — $ — $ — ProShares Ultra Euro Foreign currency forward contracts 321,609 — 321,609 5

Agreements

Agreements	12 Months Ended
	Dec. 31, 2018
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 has not and will not charge a Management Fee in each of the Fund’s first year of operations in an amount equal to the offering costs. The Sponsor has reimbursed and will 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 trading advisory services and the other services provided to the Fund that the Sponsor pays directly. 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 Bank of New York Mellon (“BNY Mellon”) serves as the Administrator of the Funds. The Trust, on its own behalf and on behalf of each Fund, and BNY Mellon have entered into an administration and accounting agreement (the “Administration and Accounting Agreement”) in connection therewith. Pursuant to the terms of the Administration and Accounting Agreement and under the supervision and direction of the Sponsor and the Trust, BNY Mellon prepares and files certain regulatory filings on behalf of the Funds. BNY Mellon may also perform other services for the Funds pursuant to the Administration and Accounting Agreement as mutually agreed upon by the Sponsor, the Trust and BNY Mellon from time to time. The Administrator’s fees are paid on behalf of the Funds by the Sponsor. Brown Brothers Harriman & Co. (“BBH&Co.”) served as administrator of the Funds and the Trust until replaced by BNY Mellon on October 1, 2018. The Custodian BNY Mellon serves as the Custodian of the Funds, and the Trust, on its own behalf and on behalf of each Fund, and BNY Mellon have entered into a custody agreement (the “Custody Agreement”) in connection therewith. Pursuant to the terms of the Custody Agreement, BNY Mellon 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 BNY Mellon by the Funds. The Custodian’s fees are paid on behalf of the Funds by the Sponsor. BBH&Co. served as custodian of the Funds and the Trust until replaced by BNY Mellon on October 1, 2018. The Transfer Agent BNY Mellon serves as the Transfer Agent of the Funds for Authorized Participants and has entered into a transfer agency and service agreement (the “Transfer Agency and Service Agreement”). Pursuant to the terms of the Transfer Agency and Service Agreement, BNY Mellon is responsible for processing purchase and redemption orders and maintaining records of ownership of the Funds. The Transfer Agent Fees are paid on behalf of the Funds by the Sponsor. BBH&Co. served as transfer agent of the Funds and the Trust until replaced by BNY Mellon on October 1, 2018. 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, 2018
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 has reimbursed ProShares UltraPro 3x Crude Oil ETF and ProShares UltraPro 3x Short Crude Oil ETF to the extent that their respective offering costs exceeded 0.95% of their average daily NAV during their first year of operations.

Creation and Redemption of Crea

Creation and Redemption of Creation Units	12 Months Ended
	Dec. 31, 2018
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 governed 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 with the relevant fund 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 BNY Mellon, 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 for the years ended December 31, 2018, 2017 and 2016 which are included in the Addition and/or Redemption of Shares on the Statements of Changes in Shareholders’ Equity, were as follows: Year Ended Year Ended Year Ended Fund December 31, 2018 December 31, 2017 December 31, 2016* ProShares Short Euro $ — $ — $ — ProShares Short VIX Short-Term Futures ETF 699,323 1,008,452 801,564 ProShares Ultra Bloomberg Crude Oil 235,966 610,969 504,533 ProShares Ultra Bloomberg Natural Gas 16,562 15,937 9,175 ProShares Ultra Euro — — — ProShares Ultra Gold 10,139 14,460 14,138 ProShares Ultra Silver 26,173 28,622 47,414 ProShares Ultra VIX Short-Term Futures ETF 2,194,669 1,036,162 1,822,247 ProShares Ultra Yen — — — ProShares UltraPro 3x Crude Oil ETF 81,882 25,455 — ProShares UltraPro 3x Short Crude Oil ETF 46,345 14,096 — ProShares UltraShort Australian Dollar — — — ProShares UltraShort Bloomberg Crude Oil 135,524 207,707 398,027 ProShares UltraShort Bloomberg Natural Gas 9,616 4,713 8,989 ProShares UltraShort Euro — — — ProShares UltraShort Gold 10,644 15,945 29,854 ProShares UltraShort Silver — — 16,729 ProShares UltraShort Yen — — — ProShares VIX Mid-Term 27,723 13,605 24,056 ProShares VIX Short-Term Futures ETF 160,987 142,380 229,699 Total Trust $ 3,655,553 $ 3,138,503 $ 3,906,425 * 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.

Financial Highlights

Financial Highlights	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Financial Highlights	NOTE 7 – FINANCIAL HIGHLIGHTS Selected data for a Share outstanding throughout the year ended December 31, 2018: For the Year Ended December 31, 2018 Per Share Operating Performance Short Euro Short VIX Short-Term Futures ETF * Ultra Bloomberg Ultra Bloomberg Natural Gas * Ultra Euro Ultra Gold Net asset value, at December 31, 2017 $ 39.96 $ 509.20 $ 23.66 $ 32.64 $ 17.44 $ 39.88 Net investment income gain (loss) 0.22 (0.23 ) 0.20 0.09 0.06 0.28 Net realized and unrealized gain (loss)# 2.92 (466.61 ) (10.80 ) (7.45 ) (2.41 ) (3.04 ) Change in net asset value from operations 3.14 (466.84 ) (10.60 ) (7.36 ) (2.35 ) (2.76 ) Net asset value, at December 31, 2018 $ 43.10 $ 42.36 $ 13.06 $ 25.28 $ 15.09 $ 37.12 Market value per share, at December 31, 2017 † $ 39.99 $ 512.84 $ 23.44 $ 32.50 $ 17.46 $ 40.67 Market value per share, at December 31, 2018 † $ 43.08 $ 42.30 $ 13.30 $ 25.82 $ 15.12 $ 37.41 Total Return, at net asset value 7.9 % (91.7 )% (44.8 )% (22.5 )% (13.5 )% (6.9 )% Total Return, at market value 7.7 % (91.8 )% (43.3 )% (20.6 )% (13.4 )% (8.0 )% Ratios to Average Net Assets Expense ratio 0.97 % 1.34 % 0.97 % 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 gain (loss) 0.54 % (0.37 )% 0.73 % 0.30 % 0.36 % 0.73 % * 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 NYSE Arca, which may be later than when the Funds’ net asset is calculated. For the Year Ended December 31, 2018 Per Share Operating Performance Ultra Silver Ultra VIX Short-Term Futures ETF * Ultra Yen UltraPro 3x Crude Oil ETF UltraPro 3x Short Crude Oil ETF * UltraShort Net asset value, at December 31, 2017 $ 33.55 $ 51.67 $ 57.32 $ 37.78 $ 42.32 $ 45.67 Net investment income gain (loss) 0.20 (0.40 ) (0.02 ) (0.04 ) (0.12 ) 0.23 Net realized and unrealized gain (loss)# (7.36 ) 30.19 0.23 (24.66 ) 7.59 9.40 Change in net asset value from operations (7.16 ) 29.79 0.21 (24.70 ) 7.47 9.63 Net asset value, at December 31, 2018 $ 26.39 $ 81.46 $ 57.53 $ 13.08 $ 49.79 $ 55.30 Market value per share, at December 31, 2017 † $ 33.85 $ 51.05 $ 57.45 $ 37.23 $ 42.88 $ 45.72 Market value per share, at December 31, 2018 † $ 26.37 $ 81.73 $ 57.55 $ 13.47 $ 48.43 $ 54.92 Total Return, at net asset value (21.3 )% 57.7 % 0.4 % (65.4 )% 17.7 % 21.1 % Total Return, at market value (22.1 )% 60.1 % 0.2 % (63.8 )% 12.9 % 20.1 % Ratios to Average Net Assets Expense ratio 0.95 % 1.68 % 0.95 % 1.22 % 1.24 % 1.03 % Expense ratio, excluding brokerage commissions and fees 0.95 % 0.95 % 0.95 % 0.95 % 0.95 % 0.95 % Net investment income gain (loss) 0.69 % (0.75 )% (0.03 )% (0.12 )% (0.45 )% 0.46 % * 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 NYSE Arca, which may be later than when the Funds’ net asset is calculated. For the Year Ended December 31, 2018 Per Share Operating Performance UltraShort UltraShort UltraShort UltraShort UltraShort UltraShort Yen Net asset value, at December 31, 2017 $ 24.31 $ 39.48 $ 21.21 $ 70.47 $ 31.71 $ 74.93 Net investment income gain (loss) 0.11 (0.01 ) 0.16 0.47 0.20 0.53 Net realized and unrealized gain (loss)# 5.37 (17.86 ) 2.90 2.34 5.22 (1.57 ) Change in net asset value from operations 5.48 (17.87 ) 3.06 2.81 5.42 (1.04 ) Net asset value, at December 31, 2018 $ 29.79 $ 21.61 $ 24.27 $ 73.28 $ 37.13 $ 73.89 Market value per share, at December 31, 2017 † $ 24.56 $ 39.65 $ 21.20 $ 69.11 $ 31.40 $ 74.98 Market value per share, at December 31, 2018 † $ 29.28 $ 21.22 $ 24.25 $ 72.84 $ 37.10 $ 73.86 Total Return, at net asset value 22.5 % (45.3 )% 14.4 % 4.0 % 17.1 % (1.4 )% Total Return, at market value 19.2 % (46.5 )% 14.4 % 5.4 % 18.2 % (1.5 )% Ratios to Average Net Assets Expense ratio 0.98 % 1.41 % 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 gain (loss) 0.59 % (0.05 )% 0.73 % 0.64 % 0.55 % 0.73 % # 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 NYSE Arca, which may be later than when the Funds’ net asset is calculated. For the Year Ended December 31, 2018 Per Share Operating Performance VIX Mid- Term Futures ETF VIX Short- ETF Net asset value, at December 31, 2017 $ 21.29 $ 23.34 Net investment income gain 0.10 0.08 Net realized and unrealized gain (loss)# 5.26 15.16 Change in net asset value from operations 5.36 15.24 Net asset value, at December 31, 2018 $ 26.65 $ 38.58 Market value per share, at December 31, 2017 † $ 21.15 $ 23.15 Market value per share, at December 31, 2018 † $ 26.74 $ 38.61 Total Return, at net asset value 25.2 % 65.3 % Total Return, at market value 26.4 % 66.8 % Ratios to Average Net Assets Expense ratio 0.97 % 1.00 % Expense ratio, excluding brokerage commissions and fees 0.85 % 0.85 % Net investment income gain 0.45 % 0.30 % # 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 NYSE Arca, which may be later than when the Funds’ net asset is calculated. 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 Futures ETF * Ultra Bloomberg Ultra Bloomberg Natural Gas * Ultra Euro Ultra Gold Net asset value, at December 31, 2016 $ 45.06 $ 182.46 $ 23.34 $ 94.24 $ 14.02 $ 32.90 Net investment income (loss) (0.14 ) (2.41 ) (0.03 ) (0.23 ) (0.04 ) (0.06 ) Net realized and unrealized gain (loss)# (4.96 ) 329.15 0.35 (61.37 ) 3.46 7.04 Change in net asset value from operations (5.10 ) 326.74 0.32 (61.60 ) 3.42 6.98 Net asset value, at December 31, 2017 $ 39.96 $ 509.20 $ 23.66 $ 32.64 $ 17.44 $ 39.88 Market value per share, at December 31, 2016 † $ 45.12 $ 181.96 $ 23.36 $ 94.80 $ 14.09 $ 33.20 Market value per share, at December 31, 2017 † $ 39.99 $ 512.84 $ 23.44 $ 32.50 $ 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 NYSE Arca, which may be later than when the Funds’ net asset is calculated. For the Year Ended December 31, 2017 Per Share Operating Performance Ultra Silver Ultra VIX Short-Term Futures ETF * Ultra Yen UltraPro 3x ETF + UltraPro 3x Short Crude Oil ETF *+ UltraShort Australian Dollar Net asset value, at December 31, 2016 $ 33.44 $ 869.63 $ 55.43 $ 25.00 $ 100.00 $ 55.38 Net investment income (loss) (0.05 ) (1.66 ) (0.24 ) (0.21 ) (0.66 ) (0.17 ) Net realized and unrealized gain (loss)# 0.16 (816.30 ) 2.13 12.99 (57.02 ) (9.54 ) Change in net asset value from operations 0.11 (817.96 ) 1.89 12.78 (57.68 ) (9.71 ) Net asset value, at December 31, 2017 $ 33.55 $ 51.67 $ 57.32 $ 37.78 $ 42.32 $ 45.67 Market value per share, at December 31, 2016 † $ 32.09 $ 875.00 $ 55.52 $ 25.00 $ 100.00 $ 55.24 Market value per share, at December 31, 2017 † $ 33.85 $ 51.05 $ 57.45 $ 37.23 $ 42.88 $ 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 NYSE Arca, which may be later than when the Funds’ net asset 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 of commencement of operations through December 31, 2017 are calculated based on the initial offering price upon commencement of operations of $25.00 and $100.00 respectively. ^ 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 NYSE Arca, which may be later than when the Funds’ net asset is calculated. For the Year Ended December 31, 2017 Per Share Operating Performance VIX Mid- Term Futures ETF VIX Short- ETF * 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 NYSE Arca, which may be later than when the Funds’ net asset 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 Futures ETF * Ultra Bloomberg Crude Oil * Ultra Bloomberg Natural Gas * Ultra Euro Ultra Gold Net asset value, at December 31, 2015 $ 43.78 $ 101.63 $ 25.15 $ 92.85 $ 15.51 $ 29.73 Net investment income (loss) (0.33 ) (1.22 ) (0.15 ) (0.79 ) (0.11 ) (0.28 ) Net realized and unrealized gain (loss)# 1.61 82.05 (1.66 ) 2.18 (1.38 ) 3.45 Change in net asset value from operations 1.28 80.83 (1.81 ) 1.39 (1.49 ) 3.17 Net asset value, at December 31, 2016 $ 45.06 $ 182.46 $ 23.34 $ 94.24 $ 14.02 $ 32.90 Market value per share, at December 31, 2015 † $ 43.74 $ 100.92 $ 25.08 $ 92.40 $ 15.51 $ 29.73 Market value per share, at December 31, 2016 † $ 45.12 $ 181.96 $ 23.36 $ 94.80 $ 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 and fees 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 NYSE Arca, which may be later than when the Funds’ net asset is calculated. For the Year Ended December 31, 2016 Per Share Operating Performance Ultra Silver Ultra VIX Short-Term Futures ETF * Ultra Yen UltraShort Australian Dollar UltraShort Bloomberg Crude Oil * UltraShort * Net asset value, at December 31, 2015 $ 27.06 $ 14,042.01 $ 54.75 $ 58.46 $ 66.60 $ 46.53 Net investment income (loss) (0.27 ) (38.39 ) (0.45 ) (0.43 ) (0.36 ) (0.68 ) Net realized and unrealized gain (loss)# 6.65 (13,133.99 ) 1.13 (2.65 ) (34.54 ) (22.75 ) Change in net asset value from operations 6.38 (13,172.38 ) 0.68 (3.08 ) (34.90 ) (23.43 ) Net asset value, at December 31, 2016 $ 33.44 $ 869.63 $ 55.43 $ 55.38 $ 31.70 $ 23.10 Market value per share, at December 31, 2015 † $ 27.08 $ 14,175.00 $ 54.70 $ 58.15 $ 66.82 $ 46.55 Market value per share, at December 31, 2016 † $ 32.09 $ 875.00 $ 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 and fees 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 NYSE Arca, which may be later than when the Funds’ net asset is calculated. For the Year Ended December 31, 2016 Per Share Operating Performance UltraShort Euro UltraShort Gold UltraShort Silver UltraShort Yen VIX Mid- Term Futures ETF VIX Short- ETF * 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 and fees 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 NYSE Arca, which may be later than when the Funds’ net asset is calculated.

Risk

Risk	12 Months Ended
	Dec. 31, 2018
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 in amount, and possibly even direction from one-half (-0.5x), (-1x), (-2x), (-3x), one-half 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 1.5x or 2x or 3x multiple should be approximately one and one-half (-2x) (-3x) While the Funds seek to meet their investment objectives, there is no guarantee they will do so. Factors that may affect a Fund’s ability to meet its investment objective include: (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, extreme market volatility, and other factors 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., -0.5x, -1x, -2x, -3x, Each Geared Fund seeks to rebalance its portfolio on a daily basis. The time and manner in which a Geared Fund rebalances its portfolio may vary from day to day depending upon market conditions and other circumstances at the discretion of the Sponsor. 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 Each Fund may use derivatives such as swap agreements and forward contracts (collectively referred to herein as “derivatives”) in the manner described herein as a means to achieve their respective investment objectives. The use of derivatives by a Fund exposes the Fund to counterparty risks. Regulatory Treatment Derivatives are generally traded in OTC markets and have only recently become subject to comprehensive regulation in the United States. Cash-settled forwards are generally regulated as “swaps”, whereas physically settled forwards are generally not subject to regulation (in the case of commodities other than currencies) or subject to the federal securities laws (in the case of securities). Title VII of the Dodd-Frank Act (“Title VII”) created a regulatory regime for derivatives, with the CFTC responsible for the regulation of swaps and the SEC responsible for the regulation of “security-based swaps.” The SEC requirements have largely yet to be made effective, but the CFTC requirements are largely in place. The CFTC requirements have included rules for some of the types of transactions in which the Funds will engage, including mandatory clearing and exchange trading, reporting, and margin for OTC swaps. Title VII also created new categories of regulated market participants, such as “swap dealers,” “security-based swap dealers,” “major swap participants,” and “major security-based swap participants” who are, or will be, subject to significant new capital, registration, recordkeeping, reporting, disclosure, business conduct and other regulatory requirements. The regulatory requirements under Title VII continue to be developed and there may be further modifications that could materially and adversely impact the Funds, the markets in which a Fund trades and the counterparties with which the Fund engages in transactions. As noted, the CFTC rules may not apply to all of the swap agreements and forward contracts entered into by the Funds. Investors, therefore, may not receive the protection of CFTC regulation or the statutory scheme of 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. Counterparty Credit Risk The Funds will be subject to the credit risk of the counterparties to the derivatives. In the case of cleared derivatives, the Funds will have credit risk to the clearing corporation in a similar manner as the Funds would for futures contracts. In the case of OTC derivatives, the Funds will be subject to the credit risk of the counterparty to the transaction – typically a single bank or financial institution. As a result, a Fund is subject to increased credit risk with respect to the amount it expects to receive from counterparties to OTC derivatives 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 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 derivatives of the type that may be utilized by the Funds are generally 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. 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 to the party under the agreement. For example, 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 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 derivatives benefit from daily marking-to-market The Sponsor regularly reviews the performance of its counterparties for, among other things, creditworthiness and execution quality. In addition, the Sponsor periodically considers the addition of new counterparties and the counterparties used by a Fund may change at any time. Each day, the Funds disclose their portfolio holdings as of the prior Business Day. Each Fund’s portfolio holdings identifies its counterparties, as applicable. This portfolio holdings information may be accessed through the web on the Sponsor’s website at www.ProShares.com. Each counterparty and/or any of its affiliates may be an Authorized Participant or shareholder of a Fund, subject to applicable law. The counterparty risk for cleared derivatives transactions is generally lower than for OTC derivatives. Once a transaction is cleared, the clearing organization is substituted and is a Fund’s counterparty on the derivative. The clearing organization guarantees the performance of the other side of the derivative. Nevertheless, some risk remains, as there is no assurance that the clearing organization, or its members, will satisfy its obligations to a 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, even over periods as short as a single day. For example, because the UltraShort Funds and Ultra Funds (except for the Ultra VIX Short-Term Futures ETF which includes a one and one-half (-2x), single-day (-3x) 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 2017 may specify a January 2018 expiration. As that contract nears expiration, it may be replaced by selling the January 2018 contract and purchasing the contract expiring in March 2018. 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 2018 contract would take place at a price that is higher than the price at which the March 2018 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 have historically exhibited 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.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	NOTE 9 – SUBSEQUENT EVENTS On December 20, 2018, the Trust announced that each of the ProShares Ultra Silver and the ProShares UltraShort Silver ETFs (the “Silver Funds” tickers AGQ and ZSL, respectively) and the ProShares Ultra Gold and the ProShares UltraShort Gold ETFs (the “Gold Funds” tickers UGL and GLL, respectively) will change their respective benchmarks. The Silver Funds and the Gold Funds struck their NAVs using their respective new benchmarks for the first time on January 7, 2019. The new benchmark for the Silver Funds is the Bloomberg Silver Subindex (ticker: BCOMSI) and the new benchmark for the Gold Funds is the Bloomberg Gold Subindex (ticker: BCOMGC). On January 29, 2019, ProShare Capital Management LLC (the “Sponsor”) and ProShares Trust II (the “Trust”) were named as defendants in a purported class action lawsuit filed in the United States District Court for the Southern District of New York, styled Ford v. ProShares Trust II et al. 10b-5

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
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, 2018 and 2017, and represents cash, segregated cash balances with brokers for futures contracts, segregated cash with brokers for swap agreements, segregated cash with brokers for forward agreements, and segregated cash with brokers for foreign currency forward agreements but does not include short-term investments.
Final Net Asset Value for Fiscal Period	Final Net Asset Value for Fiscal Period The cut-off Fund Create/Redeem Cut-off* NAV Calculation Time NAV Calculation Date ProShares UltraShort Silver, ProShares 6:30 a.m. 7:00 a.m. December 31, 2018 ProShares UltraShort Gold, ProShares 9:30 a.m. 10:00 a.m. December 31, 2018 ProShares UltraShort Bloomberg Crude Oil, ProShares Ultra Bloomberg Crude Oil, 2:00 p.m. 2:30 p.m. December 31, 2018 ProShares UltraPro 3x Short Crude Oil ETF, ProShares UltraPro 3x Crude Oil ETF ProShares UltraShort Bloomberg Natural Gas, ProShares Ultra Bloomberg Natural Gas 2:00 p.m. 2:30 p.m. December 31, 2018 ProShares UltraShort Australian Dollar 3:00 p.m. 4:00 p.m. December 31, 2018 ProShares Short Euro ProShares UltraShort Euro, ProShares Ultra Euro 3:00 p.m. 4:00 p.m. December 31, 2018 ProShares UltraShort Yen, ProShares Ultra Yen 3:00 p.m. 4:00 p.m. December 31, 2018 ProShares VIX Short-Term Futures ETF, ProShares Ultra VIX Short-Term Futures ETF, ProShares Short VIX Short-Term Futures ETF 2:00 p.m. 4:15 p.m. December 31, 2018 ProShares VIX Mid-Term 2:00 p.m. 4:15 p.m. December 31, 2018 * 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, 2018. 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, 2018.
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., futures contracts, swap agreements, forward agreements and foreign currency forward contracts) are generally valued using independent sources and/or agreements with counterparties or other procedures as determined by the Sponsor. Futures contracts, except for those entered into by the Gold, Silver, Australian Dollar and Short Euro Funds, are generally valued at the last settled price on the applicable exchange on which that future trades. Futures contracts entered into by the Gold, Silver, Australian Dollar and Short Euro Funds are generally valued at the last sales price prior to the time at which the NAV per Share of a Fund is determined. For financial reporting purposes, all futures contracts are generally valued at the last settled price. Futures contracts valuations are typically categorized as Level I in the fair value hierarchy. Swap agreements, forward agreements and foreign currency forward contracts valuations are typically categorized as Level II in the fair value hierarchy. The Sponsor may in its sole discretion choose to determine a fair value price as the basis for determining the market value of such position. Such fair value prices would generally be determined based on available inputs about the current value of the underlying financial instrument or commodity and would be based on principles that the Sponsor deems fair and equitable so long as such principles are consistent with industry standards. The Sponsor may fair value an asset of a Fund pursuant to the policies the Sponsor has adopted. Depending on the source and relevant significance of valuation inputs, these instruments may be classified as Level II or Level III in the fair value hierarchy. 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, 2018 using the fair value hierarchy: Level I - Quoted Prices Level II - Other Significant Observable Inputs Fund Short-Term U.S. Government and Agencies Futures Contracts * Forward Agreements Foreign Currency Forward Contracts Swap Agreements Total ProShares Short Euro $ 599,429 $ (43,281 ) $ — $ — $ — $ 556,148 ProShares Short VIX Short-Term Futures ETF — (14,476,201 ) — — — (14,476,201 ) ProShares Ultra Bloomberg Crude Oil 280,502,900 (14,040,301 ) — — (72,767,125 ) 193,695,474 ProShares Ultra Bloomberg Natural Gas 8,380,427 (10,323,163 ) — — — (1,942,736 ) ProShares Ultra Euro 1,496,658 — — 57,938 — 1,554,596 ProShares Ultra Gold 41,941,734 72,670 4,253,301 — — 46,267,705 ProShares Ultra Silver 123,795,806 340,736 26,301,717 — — 150,438,259 ProShares Ultra VIX Short-Term Futures ETF — 32,503,965 — — (1,330,949 ) 31,173,016 ProShares Ultra Yen — — — 177,111 — 177,111 ProShares UltraPro 3x Crude Oil ETF 20,979,876 (23,451,361 ) — — — (2,471,485 ) ProShares UltraPro 3x Short Crude Oil ETF — 7,019,475 — — — 7,019,475 ProShares UltraShort Australian Dollar 299,537 511,825 — — — 811,362 ProShares UltraShort Bloomberg Crude Oil 27,967,534 3,272,155 — — 20,646,726 51,886,415 ProShares UltraShort Bloomberg Natural Gas 299,714 10,837,989 — — — 11,137,703 ProShares UltraShort Euro 121,801,685 — — (1,495,804 ) — 120,305,881 ProShares UltraShort Gold 3,989,563 (31,780 ) (990,786 ) — — 2,966,997 ProShares UltraShort Silver 3,294,766 (44,917 ) (1,793,011 ) — — 1,456,838 ProShares UltraShort Yen 34,951,229 — — (3,123,744 ) — 31,827,485 ProShares VIX Mid-Term — 3,758,106 — — — 3,758,106 ProShares VIX Short-Term Futures ETF 114,785,002 17,378,445 — — — 132,163,447 Total Trust $ 785,085,860 $ 13,284,362 $ 27,771,221 $ (4,384,499 ) $ (53,451,348 ) $ 768,305,596 * Incudes cumulative appreciation/depreciation of futures contracts as reported in the Schedule of Investments. Only current day’s variation margin is reported within the Statements of Financial Condition in receivable/payable on open futures. 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, 2017 using the fair value hierarchy: Level I - Quoted Prices Level II - Other Significant Observable Inputs Fund Short-Term U.S. Government and Agencies Futures Contracts * Forward Agreements Foreign Currency Forward Contracts Swap Agreements Total ProShares Short Euro $ 6,996,235 $ (166,288 ) $ — $ — $ — $ 6,829,947 ProShares Short VIX Short-Term Futures ETF 494,910,644 17,041,449 — — — 511,952,093 ProShares Ultra Bloomberg Crude Oil 459,515,902 11,945,979 — — 62,238,361 533,700,242 ProShares Ultra Bloomberg Natural Gas 50,961,356 7,225,810 — — — 58,187,166 ProShares Ultra Euro 6,996,235 — — 264,152 — 7,260,387 ProShares Ultra Gold 88,884,844 5,480 3,646,355 — — 92,536,679 ProShares Ultra Silver 235,581,716 1,600 21,735,334 — — 257,318,650 ProShares Ultra VIX Short-Term Futures ETF 287,533,132 (34,466,120 ) — — — 253,067,012 ProShares Ultra Yen 1,997,933 — — (34,824 ) — 1,963,109 ProShares UltraPro 3x Crude Oil ETF — 1,417,998 — — — 1,417,998 ProShares UltraPro 3x Short Crude Oil ETF — (2,988,155 ) — — — (2,988,155 ) ProShares UltraShort Australian Dollar 11,983,904 (893,220 ) — — — 11,090,684 ProShares UltraShort Bloomberg Crude Oil 253,646,823 (3,962,648 ) — — (30,607,142 ) 219,077,033 ProShares UltraShort Bloomberg Natural Gas 3,999,751 (1,097,049 ) — — — 2,902,702 ProShares UltraShort Euro 204,770,166 — — (6,344,269 ) — 198,425,897 ProShares UltraShort Gold 31,977,900 (5,460 ) (1,488,259 ) — — 30,484,181 ProShares UltraShort Silver 18,349,861 (1,650 ) (1,716,163 ) — — 16,632,048 ProShares UltraShort Yen 131,834,352 — — 1,527,263 — 133,361,615 ProShares VIX Mid-Term 20,993,515 (2,215,280 ) — — — 18,778,235 ProShares 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 * Incudes cumulative appreciation/depreciation of futures contracts as reported in the Schedule of Investments. Only current day’s variation margin is reported within the Statements of Financial Condition in receivable/payable on open futures. 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. Interest income is recognized on an accrual basis and includes, where applicable, the amortization of premium or discount, and is reflected as Interest Income in the Statement 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
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., the last four tax year ends and the interim tax period since then, as applicable) and concluded that there is no tax liability resulting from unrecognized tax benefits relating to uncertain income tax positions taken or expected to be taken in future tax returns. The Funds are also not aware of any tax positions for which it is reasonably possible that the total amounts of unrecognized tax benefits will significantly change in the next twelve months. On an ongoing basis, management monitors its tax positions taken under the interpretation to determine if adjustments to conclusions are necessary based on factors including, but not limited to, on-going
New Accounting Pronouncements	New Accounting Pronouncements In November 2016, the FASB issued Accounting Standards Update No. 2016-18, 2016-18”), In August 2018, the FASB issued Accounting Standards Update No. 2018-13, 2018-13”). 2018-13 2018-13

Organization (Tables)

Organization (Tables)	12 Months Ended
	Dec. 31, 2018
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, 2016, 2017, and 2018. 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 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 ProShares Ultra Bloomberg Natural Gas March 19, 2018 1-for-5 March 20, 2018 ProShares UltraPro 3x Short Crude Oil ETF March 19, 2018 1-for-4 March 20, 2018 ProShares Short VIX Short-Term Futures ETF September 17, 2018 1-for-4 September 18, 2018 ProShares Ultra VIX Short-Term Futures ETF September 17, 2018 1-for-5 September 18, 2018

Significant Accounting Polici_3

Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2018
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 Fund Create/Redeem Cut-off* NAV Calculation Time NAV Calculation Date ProShares UltraShort Silver, ProShares 6:30 a.m. 7:00 a.m. December 31, 2018 ProShares UltraShort Gold, ProShares 9:30 a.m. 10:00 a.m. December 31, 2018 ProShares UltraShort Bloomberg Crude Oil, ProShares Ultra Bloomberg Crude Oil, 2:00 p.m. 2:30 p.m. December 31, 2018 ProShares UltraPro 3x Short Crude Oil ETF, ProShares UltraPro 3x Crude Oil ETF ProShares UltraShort Bloomberg Natural Gas, ProShares Ultra Bloomberg Natural Gas 2:00 p.m. 2:30 p.m. December 31, 2018 ProShares UltraShort Australian Dollar 3:00 p.m. 4:00 p.m. December 31, 2018 ProShares Short Euro ProShares UltraShort Euro, ProShares Ultra Euro 3:00 p.m. 4:00 p.m. December 31, 2018 ProShares UltraShort Yen, ProShares Ultra Yen 3:00 p.m. 4:00 p.m. December 31, 2018 ProShares VIX Short-Term Futures ETF, ProShares Ultra VIX Short-Term Futures ETF, ProShares Short VIX Short-Term Futures ETF 2:00 p.m. 4:15 p.m. December 31, 2018 ProShares VIX Mid-Term 2:00 p.m. 4:15 p.m. December 31, 2018 * 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, 2018.
Valuation of Investments using Fair Value Hierarchy	The following table summarizes the valuation of investments at December 31, 2018 using the fair value hierarchy: Level I - Quoted Prices Level II - Other Significant Observable Inputs Fund Short-Term U.S. Government and Agencies Futures Contracts * Forward Agreements Foreign Currency Forward Contracts Swap Agreements Total ProShares Short Euro $ 599,429 $ (43,281 ) $ — $ — $ — $ 556,148 ProShares Short VIX Short-Term Futures ETF — (14,476,201 ) — — — (14,476,201 ) ProShares Ultra Bloomberg Crude Oil 280,502,900 (14,040,301 ) — — (72,767,125 ) 193,695,474 ProShares Ultra Bloomberg Natural Gas 8,380,427 (10,323,163 ) — — — (1,942,736 ) ProShares Ultra Euro 1,496,658 — — 57,938 — 1,554,596 ProShares Ultra Gold 41,941,734 72,670 4,253,301 — — 46,267,705 ProShares Ultra Silver 123,795,806 340,736 26,301,717 — — 150,438,259 ProShares Ultra VIX Short-Term Futures ETF — 32,503,965 — — (1,330,949 ) 31,173,016 ProShares Ultra Yen — — — 177,111 — 177,111 ProShares UltraPro 3x Crude Oil ETF 20,979,876 (23,451,361 ) — — — (2,471,485 ) ProShares UltraPro 3x Short Crude Oil ETF — 7,019,475 — — — 7,019,475 ProShares UltraShort Australian Dollar 299,537 511,825 — — — 811,362 ProShares UltraShort Bloomberg Crude Oil 27,967,534 3,272,155 — — 20,646,726 51,886,415 ProShares UltraShort Bloomberg Natural Gas 299,714 10,837,989 — — — 11,137,703 ProShares UltraShort Euro 121,801,685 — — (1,495,804 ) — 120,305,881 ProShares UltraShort Gold 3,989,563 (31,780 ) (990,786 ) — — 2,966,997 ProShares UltraShort Silver 3,294,766 (44,917 ) (1,793,011 ) — — 1,456,838 ProShares UltraShort Yen 34,951,229 — — (3,123,744 ) — 31,827,485 ProShares VIX Mid-Term — 3,758,106 — — — 3,758,106 ProShares VIX Short-Term Futures ETF 114,785,002 17,378,445 — — — 132,163,447 Total Trust $ 785,085,860 $ 13,284,362 $ 27,771,221 $ (4,384,499 ) $ (53,451,348 ) $ 768,305,596 * Incudes cumulative appreciation/depreciation of futures contracts as reported in the Schedule of Investments. Only current day’s variation margin is reported within the Statements of Financial Condition in receivable/payable on open futures. 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, 2017 using the fair value hierarchy: Level I - Quoted Prices Level II - Other Significant Observable Inputs Fund Short-Term U.S. Government and Agencies Futures Contracts * Forward Agreements Foreign Currency Forward Contracts Swap Agreements Total ProShares Short Euro $ 6,996,235 $ (166,288 ) $ — $ — $ — $ 6,829,947 ProShares Short VIX Short-Term Futures ETF 494,910,644 17,041,449 — — — 511,952,093 ProShares Ultra Bloomberg Crude Oil 459,515,902 11,945,979 — — 62,238,361 533,700,242 ProShares Ultra Bloomberg Natural Gas 50,961,356 7,225,810 — — — 58,187,166 ProShares Ultra Euro 6,996,235 — — 264,152 — 7,260,387 ProShares Ultra Gold 88,884,844 5,480 3,646,355 — — 92,536,679 ProShares Ultra Silver 235,581,716 1,600 21,735,334 — — 257,318,650 ProShares Ultra VIX Short-Term Futures ETF 287,533,132 (34,466,120 ) — — — 253,067,012 ProShares Ultra Yen 1,997,933 — — (34,824 ) — 1,963,109 ProShares UltraPro 3x Crude Oil ETF — 1,417,998 — — — 1,417,998 ProShares UltraPro 3x Short Crude Oil ETF — (2,988,155 ) — — — (2,988,155 ) ProShares UltraShort Australian Dollar 11,983,904 (893,220 ) — — — 11,090,684 ProShares UltraShort Bloomberg Crude Oil 253,646,823 (3,962,648 ) — — (30,607,142 ) 219,077,033 ProShares UltraShort Bloomberg Natural Gas 3,999,751 (1,097,049 ) — — — 2,902,702 ProShares UltraShort Euro 204,770,166 — — (6,344,269 ) — 198,425,897 ProShares UltraShort Gold 31,977,900 (5,460 ) (1,488,259 ) — — 30,484,181 ProShares UltraShort Silver 18,349,861 (1,650 ) (1,716,163 ) — — 16,632,048 ProShares UltraShort Yen 131,834,352 — — 1,527,263 — 133,361,615 ProShares VIX Mid-Term 20,993,515 (2,215,280 ) — — — 18,778,235 ProShares 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 * Incudes cumulative appreciation/depreciation of futures contracts as reported in the Schedule 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, 2018
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, 2018 Asset Derivatives Liability Derivatives Derivatives Not Fund Statements of Financial Condition Unrealized Appreciation Statements of Financial Condition Unrealized Depreciation VIX Futures Contracts Receivables on open futures contracts, unrealized appreciation on swap agreements Payable on open futures contracts, unrealized depreciation on swap agreements ProShares Short VIX Short-Term Futures ETF $ 910,460 * $ 15,386,661 * ProShares Ultra VIX Short-Term Futures ETF 33,798,582 * 2,625,566 * ProShares VIX Mid-Term 3,888,156 * 130,050 * ProShares VIX Short-Term Futures ETF 18,392,959 * 1,014,514 * Commodities Contracts Receivables on open futures contracts, unrealized appreciation on swap and/or forward agreements Payable on open futures contracts, unrealized depreciation on swap and/or forward agreements ProShares Ultra Bloomberg Crude Oil — 86,807,426 * ProShares Ultra Bloomberg Natural Gas — 10,323,163 * ProShares Ultra Gold 4,325,971 * — ProShares Ultra Silver 26,642,453 * — ProShares UltraPro 3x Crude Oil ETF — 23,451,361 * ProShares UltraPro 3x Short Crude Oil ETF 7,019,475 * — ProShares UltraShort Bloomberg Crude Oil 23,918,881 * — ProShares UltraShort Bloomberg Natural Gas 10,837,989 * — ProShares UltraShort Gold — 1,022,566 * ProShares UltraShort Silver — 1,837,928 * Foreign Exchange Contracts Unrealized appreciation on foreign currency forward contracts, and receivables on open futures contracts Unrealized depreciation on foreign currency forward contracts, and payable on open futures contracts ProShares Short Euro — 43,281 * ProShares Ultra Euro 61,971 4,033 ProShares Ultra Yen 179,187 2,076 ProShares UltraShort Australian Dollar 511,825 * — ProShares UltraShort Euro 104,074 1,599,878 ProShares UltraShort Yen 678,152 3,801,896 Total Trust $ 131,270,135 * $ 148,050,399 * * Incudes cumulative appreciation/depreciation of futures contracts as reported in the Schedule of Investments. Only current day’s variation margin is reported within the Statements of Financial Condition in receivable/payable on open futures. Fair Value of Derivative Instruments as of December 31, 2017 Asset Derivatives Liability Derivatives Derivatives Not Accounted for as Hedging Instruments Fund Statements of Financial Condition Location Unrealized Appreciation Statements of Financial Condition Location Unrealized Depreciation VIX Futures Contracts Receivables on open futures contracts Payable on open futures contracts ProShares Short VIX Short-Term Futures ETF $ 21,493,549 * $ 4,452,100 * ProShares Ultra VIX Short-Term Futures ETF 3,974,642 * 38,440,762 * ProShares VIX Mid-Term Futures ETF — 2,215,280 * ProShares VIX Short-Term Futures ETF 709,708 * 5,471,585 * Commodities Contracts Receivables on open futures contracts, unrealized appreciation on swap and/or forward agreements Payable on open futures contracts, unrealized depreciation on swap and/or forward agreements ProShares Ultra Bloomberg Crude Oil 74,184,340 * — ProShares Ultra Bloomberg Natural Gas 7,225,810 * — ProShares Ultra Gold 3,651,835 * — ProShares Ultra Silver 21,736,934 * — ProShares UltraPro 3x Crude Oil ETF 1,417,998 * — ProShares UltraPro 3x Short Crude Oil ETF — 2,988,155 * ProShares UltraShort Bloomberg Crude Oil — 34,569,790 * ProShares UltraShort Bloomberg Natural Gas — 1,097,049 * ProShares UltraShort Gold — 1,493,719 * ProShares UltraShort Silver — 1,717,813 * Foreign Exchange Contracts Unrealized appreciation on foreign currency forward contracts, and receivables on open futures contracts Unrealized depreciation on foreign currency forward contracts, and payable on open futures contracts ProShares Short Euro — 166,288 * ProShares Ultra Euro 321,609 57,457 ProShares UltraShort Australian Dollar — 893,220 * ProShares Ultra Yen — 34,824 ProShares UltraShort Euro 499,302 6,793,571 ProShares UltraShort Yen 1,568,997 41,734 Total Trust $ 136,784,724 * $ 100,433,347 * * Incudes cumulative appreciation/depreciation of futures contracts as reported in the Schedule of Investments. Only current day’s variation margin is reported within the Statements of Financial Condition in receivable/payable on open futures.
Effect of Derivative Instruments on Statements of Operations	The Effect of Derivative Instruments on the Statement of Operations For the Year December 31, 2018 Derivatives Not Accounted for as Hedging Instruments Location of Gain (Loss) on Derivatives Recognized in Income Fund Realized Gain (Loss) on Derivatives Recognized in Income Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income VIX Futures Contracts Net realized gain (loss) on futures contracts and/or swap agreements/ changes in unrealized appreciation/ depreciation on futures contracts and/or swap agreements ProShares Short VIX Short-Term $ (1,885,564,719 ) $ (31,517,650 ) ProShares Ultra VIX Short-Term Futures ETF 390,000,742 65,639,136 ProShares VIX Mid-Term 4,332,654 5,973,386 ProShares VIX Short-Term Futures ETF 89,903,111 22,140,322 Commodities 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 21,756,994 (160,991,766 ) ProShares Ultra Bloomberg Natural Gas 21,092,864 (17,548,973 ) ProShares Ultra Gold (7,345,006 ) 674,136 ProShares Ultra Silver (57,488,526 ) 4,905,519 ProShares UltraPro 3x Crude Oil ETF (37,435,672 ) (24,869,359 ) ProShares UltraPro 3x Short Crude Oil ETF 7,377,281 10,007,630 ProShares UltraShort Bloomberg Crude Oil (42,040,086 ) 58,488,671 ProShares UltraShort Bloomberg Natural Gas (14,147,964 ) 11,935,038 ProShares UltraShort Gold 1,323,579 471,153 ProShares UltraShort Silver 5,024,976 (120,115 ) 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 459,984 123,007 ProShares Ultra Euro (1,063,823 ) (206,214 ) ProShares Ultra Yen (170,364 ) 211,935 ProShares UltraShort Australian Dollar 128,451 1,405,045 ProShares UltraShort Euro 18,953,455 4,848,465 ProShares UltraShort Yen 2,111,627 (4,651,007 ) Total Trust $ (1,482,790,442 ) $ (53,081,641 ) 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 Derivatives Recognized in Income 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 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 Futures ETF (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 Derivatives Recognized in Income Fund Realized Gain (Loss) on Derivatives Recognized in Income 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 Ultra 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 5,816,562 (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 $ (1,319,878,687 ) $ 157,908,519
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, 2018. Fair Values of Derivative Instruments as of December 31, 2018 Assets Liabilities Fund Gross Amounts of Recognized Assets presented in the Statements of Financial Condition Gross Amounts Offset in the Statements of Financial Condition Net Amounts of Assets presented in the Statements of Financial Condition Gross Amounts of Recognized Liabilities presented in the Statements of Financial Condition Gross Amounts Offset in the Statements of Financial Condition Net Amounts of Liabilities presented in the Statements of Financial Condition ProShares Ultra Bloomberg Crude Oil Swap agreements $ — $ — $ — $ 72,767,125 $ — $ 72,767,125 ProShares Ultra Euro Foreign currency forward contracts 61,971 — 61,971 4,033 — 4,033 ProShares Ultra Gold Forward agreements 4,253,301 — 4,253,301 — — — ProShares Ultra Silver Forward agreements 26,301,717 — 26,301,717 — — — ProShares Ultra VIX Short-Term Futures ETF Swap agreements — — — 1,330,949 — 1,330,949 ProShares Ultra Yen Foreign currency forward contracts 179,187 — 179,187 2,076 — 2,076 ProShares UltraShort Bloomberg Crude Oil Swap agreements 20,646,726 — 20,646,726 — — — ProShares UltraShort Euro Foreign currency forward contracts 104,074 — 104,074 1,599,878 — 1,599,878 ProShares UltraShort Gold Forward agreements — — — 990,786 — 990,786 ProShares UltraShort Silver Forward agreements — — — 1,793,011 — 1,793,011 ProShares UltraShort Yen Foreign currency forward contracts 678,152 — 678,152 3,801,896 — 3,801,896 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 Amounts of Amounts of Recognized Gross Net Amounts of Recognized Gross Net Amounts of Assets Amounts Assets Liabilities Amounts Liabilities presented in Offset in the presented in presented in Offset in the presented in the Statements the Statements the Statements the Statements Statements the Statements of Financial of Financial of Financial of Financial of Financial of Financial Fund Condition Condition Condition Condition Condition Condition 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 Ultra Yen Foreign currency forward contracts — — — 34,824 — 34,824 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
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, 2018. 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, 2018 Fund Amounts of Recognized Financial Instruments Cash Collateral for the Net Amount ProShares Ultra Bloomberg Crude Oil Citibank, N.A. $ (22,752,565 ) $ 20,667,565 $ 2,085,000 $ — Goldman Sachs International (15,691,687 ) 10,417,687 5,274,000 — Royal Bank of Canada (13,836,386 ) 13,836,386 — — Societe Generale (5,206,589 ) 1,491,589 3,715,000 — UBS AG (15,279,898 ) 15,156,898 123,000 — ProShares Ultra Euro Goldman Sachs International 26,209 — — 26,209 UBS AG 31,729 — — 31,729 ProShares Ultra Gold Citibank, N.A. 1,682,026 (1,682,026 ) — — Goldman Sachs International 1,223,528 (1,223,528 ) — — Societe Generale 61,260 — — 61,260 UBS AG 1,286,487 (1,286,487 ) — — ProShares Ultra Silver Citibank, N.A. 9,662,061 (8,053,860 ) — 1,608,201 Goldman Sachs International 8,418,745 (1,655,971 ) — 6,762,774 Societe Generale 118,797 — — 118,797 UBS AG 8,102,114 (6,971,401 ) — 1,130,713 ProShares Ultra VIX Short-Term Futures ETF Goldman Sachs International (1,330,949 ) — 1,330,949 — ProShares Ultra Yen Goldman Sachs International 73,705 — — 73,705 UBS AG 103,406 — — 103,406 ProShares UltraShort Bloomberg Crude Oil Citibank, N.A. 8,336,367 (8,336,367 ) — — Goldman Sachs International 2,752,372 (2,752,372 ) — — Royal Bank of Canada 4,237,960 — (4,237,960 ) — Societe Generale 1,891,050 (1,891,050 ) — — UBS AG 3,428,977 (3,428,977 ) — — ProShares UltraShort Euro Goldman Sachs International (610,002 ) 610,002 — — UBS AG (885,802 ) — 885,802 — ProShares UltraShort Gold Citibank, N.A. (380,655 ) 119,655 261,000 — Goldman Sachs International (258,134 ) — 258,134 — Societe Generale (63,076 ) — 63,076 — UBS AG (288,921 ) — 288,921 — ProShares UltraShort Silver Citibank, N.A. (566,050 ) — 566,050 — Goldman Sachs International (605,756 ) — 605,756 — Societe Generale (119,953 ) — 119,953 — UBS AG (501,252 ) — 501,252 — ProShares UltraShort Yen Goldman Sachs International (1,425,071 ) — 1,425,071 — UBS AG (1,698,673 ) 1,571,673 127,000 — 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 Fund 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 USB 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 General 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 General 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 General 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 General 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 General 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 — —

Creation and Redemption of Cr_2

Creation and Redemption of Creation Units (Tables)	12 Months Ended
	Dec. 31, 2018
Text Block [Abstract]
Schedule of Transaction Fees	Transaction fees for the for the years ended December 31, 2018, 2017 and 2016 which are included in the Addition and/or Redemption of Shares on the Statements of Changes in Shareholders’ Equity, were as follows: Year Ended Year Ended Year Ended Fund December 31, 2018 December 31, 2017 December 31, 2016* ProShares Short Euro $ — $ — $ — ProShares Short VIX Short-Term Futures ETF 699,323 1,008,452 801,564 ProShares Ultra Bloomberg Crude Oil 235,966 610,969 504,533 ProShares Ultra Bloomberg Natural Gas 16,562 15,937 9,175 ProShares Ultra Euro — — — ProShares Ultra Gold 10,139 14,460 14,138 ProShares Ultra Silver 26,173 28,622 47,414 ProShares Ultra VIX Short-Term Futures ETF 2,194,669 1,036,162 1,822,247 ProShares Ultra Yen — — — ProShares UltraPro 3x Crude Oil ETF 81,882 25,455 — ProShares UltraPro 3x Short Crude Oil ETF 46,345 14,096 — ProShares UltraShort Australian Dollar — — — ProShares UltraShort Bloomberg Crude Oil 135,524 207,707 398,027 ProShares UltraShort Bloomberg Natural Gas 9,616 4,713 8,989 ProShares UltraShort Euro — — — ProShares UltraShort Gold 10,644 15,945 29,854 ProShares UltraShort Silver — — 16,729 ProShares UltraShort Yen — — — ProShares VIX Mid-Term 27,723 13,605 24,056 ProShares VIX Short-Term Futures ETF 160,987 142,380 229,699 Total Trust $ 3,655,553 $ 3,138,503 $ 3,906,425 * 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.

Financial Highlights (Tables)

Financial Highlights (Tables)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Per Share Operating Performance	Selected data for a Share outstanding throughout the year ended December 31, 2018: For the Year Ended December 31, 2018 Per Share Operating Performance Short Euro Short VIX Short-Term Futures ETF * Ultra Bloomberg Ultra Bloomberg Natural Gas * Ultra Euro Ultra Gold Net asset value, at December 31, 2017 $ 39.96 $ 509.20 $ 23.66 $ 32.64 $ 17.44 $ 39.88 Net investment income gain (loss) 0.22 (0.23 ) 0.20 0.09 0.06 0.28 Net realized and unrealized gain (loss)# 2.92 (466.61 ) (10.80 ) (7.45 ) (2.41 ) (3.04 ) Change in net asset value from operations 3.14 (466.84 ) (10.60 ) (7.36 ) (2.35 ) (2.76 ) Net asset value, at December 31, 2018 $ 43.10 $ 42.36 $ 13.06 $ 25.28 $ 15.09 $ 37.12 Market value per share, at December 31, 2017 † $ 39.99 $ 512.84 $ 23.44 $ 32.50 $ 17.46 $ 40.67 Market value per share, at December 31, 2018 † $ 43.08 $ 42.30 $ 13.30 $ 25.82 $ 15.12 $ 37.41 Total Return, at net asset value 7.9 % (91.7 )% (44.8 )% (22.5 )% (13.5 )% (6.9 )% Total Return, at market value 7.7 % (91.8 )% (43.3 )% (20.6 )% (13.4 )% (8.0 )% Ratios to Average Net Assets Expense ratio 0.97 % 1.34 % 0.97 % 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 gain (loss) 0.54 % (0.37 )% 0.73 % 0.30 % 0.36 % 0.73 % * 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 NYSE Arca, which may be later than when the Funds’ net asset is calculated. For the Year Ended December 31, 2018 Per Share Operating Performance Ultra Silver Ultra VIX Short-Term Futures ETF * Ultra Yen UltraPro 3x Crude Oil ETF UltraPro 3x Short Crude Oil ETF * UltraShort Net asset value, at December 31, 2017 $ 33.55 $ 51.67 $ 57.32 $ 37.78 $ 42.32 $ 45.67 Net investment income gain (loss) 0.20 (0.40 ) (0.02 ) (0.04 ) (0.12 ) 0.23 Net realized and unrealized gain (loss)# (7.36 ) 30.19 0.23 (24.66 ) 7.59 9.40 Change in net asset value from operations (7.16 ) 29.79 0.21 (24.70 ) 7.47 9.63 Net asset value, at December 31, 2018 $ 26.39 $ 81.46 $ 57.53 $ 13.08 $ 49.79 $ 55.30 Market value per share, at December 31, 2017 † $ 33.85 $ 51.05 $ 57.45 $ 37.23 $ 42.88 $ 45.72 Market value per share, at December 31, 2018 † $ 26.37 $ 81.73 $ 57.55 $ 13.47 $ 48.43 $ 54.92 Total Return, at net asset value (21.3 )% 57.7 % 0.4 % (65.4 )% 17.7 % 21.1 % Total Return, at market value (22.1 )% 60.1 % 0.2 % (63.8 )% 12.9 % 20.1 % Ratios to Average Net Assets Expense ratio 0.95 % 1.68 % 0.95 % 1.22 % 1.24 % 1.03 % Expense ratio, excluding brokerage commissions and fees 0.95 % 0.95 % 0.95 % 0.95 % 0.95 % 0.95 % Net investment income gain (loss) 0.69 % (0.75 )% (0.03 )% (0.12 )% (0.45 )% 0.46 % * 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 NYSE Arca, which may be later than when the Funds’ net asset is calculated. For the Year Ended December 31, 2018 Per Share Operating Performance UltraShort UltraShort UltraShort UltraShort UltraShort UltraShort Yen Net asset value, at December 31, 2017 $ 24.31 $ 39.48 $ 21.21 $ 70.47 $ 31.71 $ 74.93 Net investment income gain (loss) 0.11 (0.01 ) 0.16 0.47 0.20 0.53 Net realized and unrealized gain (loss)# 5.37 (17.86 ) 2.90 2.34 5.22 (1.57 ) Change in net asset value from operations 5.48 (17.87 ) 3.06 2.81 5.42 (1.04 ) Net asset value, at December 31, 2018 $ 29.79 $ 21.61 $ 24.27 $ 73.28 $ 37.13 $ 73.89 Market value per share, at December 31, 2017 † $ 24.56 $ 39.65 $ 21.20 $ 69.11 $ 31.40 $ 74.98 Market value per share, at December 31, 2018 † $ 29.28 $ 21.22 $ 24.25 $ 72.84 $ 37.10 $ 73.86 Total Return, at net asset value 22.5 % (45.3 )% 14.4 % 4.0 % 17.1 % (1.4 )% Total Return, at market value 19.2 % (46.5 )% 14.4 % 5.4 % 18.2 % (1.5 )% Ratios to Average Net Assets Expense ratio 0.98 % 1.41 % 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 gain (loss) 0.59 % (0.05 )% 0.73 % 0.64 % 0.55 % 0.73 % # 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 NYSE Arca, which may be later than when the Funds’ net asset is calculated. For the Year Ended December 31, 2018 Per Share Operating Performance VIX Mid- Term Futures ETF VIX Short- ETF Net asset value, at December 31, 2017 $ 21.29 $ 23.34 Net investment income gain 0.10 0.08 Net realized and unrealized gain (loss)# 5.26 15.16 Change in net asset value from operations 5.36 15.24 Net asset value, at December 31, 2018 $ 26.65 $ 38.58 Market value per share, at December 31, 2017 † $ 21.15 $ 23.15 Market value per share, at December 31, 2018 † $ 26.74 $ 38.61 Total Return, at net asset value 25.2 % 65.3 % Total Return, at market value 26.4 % 66.8 % Ratios to Average Net Assets Expense ratio 0.97 % 1.00 % Expense ratio, excluding brokerage commissions and fees 0.85 % 0.85 % Net investment income gain 0.45 % 0.30 % # 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 NYSE Arca, which may be later than when the Funds’ net asset is calculated. 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 Futures ETF * Ultra Bloomberg Ultra Bloomberg Natural Gas * Ultra Euro Ultra Gold Net asset value, at December 31, 2016 $ 45.06 $ 182.46 $ 23.34 $ 94.24 $ 14.02 $ 32.90 Net investment income (loss) (0.14 ) (2.41 ) (0.03 ) (0.23 ) (0.04 ) (0.06 ) Net realized and unrealized gain (loss)# (4.96 ) 329.15 0.35 (61.37 ) 3.46 7.04 Change in net asset value from operations (5.10 ) 326.74 0.32 (61.60 ) 3.42 6.98 Net asset value, at December 31, 2017 $ 39.96 $ 509.20 $ 23.66 $ 32.64 $ 17.44 $ 39.88 Market value per share, at December 31, 2016 † $ 45.12 $ 181.96 $ 23.36 $ 94.80 $ 14.09 $ 33.20 Market value per share, at December 31, 2017 † $ 39.99 $ 512.84 $ 23.44 $ 32.50 $ 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 NYSE Arca, which may be later than when the Funds’ net asset is calculated. For the Year Ended December 31, 2017 Per Share Operating Performance Ultra Silver Ultra VIX Short-Term Futures ETF * Ultra Yen UltraPro 3x ETF + UltraPro 3x Short Crude Oil ETF *+ UltraShort Australian Dollar Net asset value, at December 31, 2016 $ 33.44 $ 869.63 $ 55.43 $ 25.00 $ 100.00 $ 55.38 Net investment income (loss) (0.05 ) (1.66 ) (0.24 ) (0.21 ) (0.66 ) (0.17 ) Net realized and unrealized gain (loss)# 0.16 (816.30 ) 2.13 12.99 (57.02 ) (9.54 ) Change in net asset value from operations 0.11 (817.96 ) 1.89 12.78 (57.68 ) (9.71 ) Net asset value, at December 31, 2017 $ 33.55 $ 51.67 $ 57.32 $ 37.78 $ 42.32 $ 45.67 Market value per share, at December 31, 2016 † $ 32.09 $ 875.00 $ 55.52 $ 25.00 $ 100.00 $ 55.24 Market value per share, at December 31, 2017 † $ 33.85 $ 51.05 $ 57.45 $ 37.23 $ 42.88 $ 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 NYSE Arca, which may be later than when the Funds’ net asset 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 of commencement of operations through December 31, 2017 are calculated based on the initial offering price upon commencement of operations of $25.00 and $100.00 respectively. ^ 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 NYSE Arca, which may be later than when the Funds’ net asset is calculated. For the Year Ended December 31, 2017 Per Share Operating Performance VIX Mid- Term Futures ETF VIX Short- ETF * 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 NYSE Arca, which may be later than when the Funds’ net asset 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 Futures ETF * Ultra Bloomberg Crude Oil * Ultra Bloomberg Natural Gas * Ultra Euro Ultra Gold Net asset value, at December 31, 2015 $ 43.78 $ 101.63 $ 25.15 $ 92.85 $ 15.51 $ 29.73 Net investment income (loss) (0.33 ) (1.22 ) (0.15 ) (0.79 ) (0.11 ) (0.28 ) Net realized and unrealized gain (loss)# 1.61 82.05 (1.66 ) 2.18 (1.38 ) 3.45 Change in net asset value from operations 1.28 80.83 (1.81 ) 1.39 (1.49 ) 3.17 Net asset value, at December 31, 2016 $ 45.06 $ 182.46 $ 23.34 $ 94.24 $ 14.02 $ 32.90 Market value per share, at December 31, 2015 † $ 43.74 $ 100.92 $ 25.08 $ 92.40 $ 15.51 $ 29.73 Market value per share, at December 31, 2016 † $ 45.12 $ 181.96 $ 23.36 $ 94.80 $ 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 and fees 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 NYSE Arca, which may be later than when the Funds’ net asset is calculated. For the Year Ended December 31, 2016 Per Share Operating Performance Ultra Silver Ultra VIX Short-Term Futures ETF * Ultra Yen UltraShort Australian Dollar UltraShort Bloomberg Crude Oil * UltraShort * Net asset value, at December 31, 2015 $ 27.06 $ 14,042.01 $ 54.75 $ 58.46 $ 66.60 $ 46.53 Net investment income (loss) (0.27 ) (38.39 ) (0.45 ) (0.43 ) (0.36 ) (0.68 ) Net realized and unrealized gain (loss)# 6.65 (13,133.99 ) 1.13 (2.65 ) (34.54 ) (22.75 ) Change in net asset value from operations 6.38 (13,172.38 ) 0.68 (3.08 ) (34.90 ) (23.43 ) Net asset value, at December 31, 2016 $ 33.44 $ 869.63 $ 55.43 $ 55.38 $ 31.70 $ 23.10 Market value per share, at December 31, 2015 † $ 27.08 $ 14,175.00 $ 54.70 $ 58.15 $ 66.82 $ 46.55 Market value per share, at December 31, 2016 † $ 32.09 $ 875.00 $ 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 and fees 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 NYSE Arca, which may be later than when the Funds’ net asset is calculated. For the Year Ended December 31, 2016 Per Share Operating Performance UltraShort Euro UltraShort Gold UltraShort Silver UltraShort Yen VIX Mid- Term Futures ETF VIX Short- ETF * 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 and fees 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 NYSE Arca, which may be later than when the Funds’ net asset is calculated.

Schedule of Investments - Short

Schedule of Investments - Short-Term U.S. Government and Agency Obligations (Detail) - U.S. Government Agencies Short-term Debt Securities [Member] - USD ($)		Dec. 31, 2018	Dec. 31, 2017
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations, value		$ 785,085,860	$ 2,445,779,873
ProShares Short Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations, value		599,429	6,996,235
ProShares Short Euro [Member] | U.S.Treasury Bills 1.689% due 01/03/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	200,000
Short-term U.S. government and agency obligations, value	[1]	199,988
ProShares Short Euro [Member] | U.S. Treasury Bills 1.941% due 01/17/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	200,000
Short-term U.S. government and agency obligations, value	[1]	199,808
ProShares Short Euro [Member] | U.S. Treasury Bills 1.976% due 01/31/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	200,000
Short-term U.S. government and agency obligations, value	[1]	199,633
ProShares Short Euro [Member] | U.S. Treasury Bills 1.033% Due 01/18/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2]		7,000,000
Short-term U.S. government and agency obligations, value	[2]		6,996,235
ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations, value			494,910,644
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	[2],[3]		36,000,000
Short-term U.S. government and agency obligations, value	[2],[3]		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	[2]		70,000,000
Short-term U.S. government and agency obligations, value	[2]		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	[2],[3]		87,000,000
Short-term U.S. government and agency obligations, value	[2],[3]		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	[2]		60,000,000
Short-term U.S. government and agency obligations, value	[2]		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	[2]		70,000,000
Short-term U.S. government and agency obligations, value	[2]		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	[2]		63,000,000
Short-term U.S. government and agency obligations, value	[2]		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	[2]		75,000,000
Short-term U.S. government and agency obligations, value	[2]		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	[2]		35,000,000
Short-term U.S. government and agency obligations, value	[2]		34,885,872
ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations, value		280,502,900	459,515,902
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.033% Due 01/18/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2],[4]		38,000,000
Short-term U.S. government and agency obligations, value	[2],[4]		37,979,564
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.080% due 02/15/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2],[4]		50,000,000
Short-term U.S. government and agency obligations, value	[2],[4]		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	[2],[4]		18,000,000
Short-term U.S. government and agency obligations, value	[2],[4]		17,968,253
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.607% due 01/03/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[4]	15,000,000
Short-term U.S. government and agency obligations, value	[1],[4]	14,999,078
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 2.287% due 01/17/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[4]	91,000,000
Short-term U.S. government and agency obligations, value	[1],[4]	90,912,794
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 2.260% due 01/31/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[4]	90,000,000
Short-term U.S. government and agency obligations, value	[1],[4]	89,834,697
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 2.400% due 02/14/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[4]	85,000,000
Short-term U.S. government and agency obligations, value	[1],[4]	84,756,331
ProShares Ultra Bloomberg Crude Oil [Member] | United States Treasury Bills 1.001% due 01/04/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2],[4]		63,000,000
Short-term U.S. government and agency obligations, value	[2],[4]		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	[2],[4]		63,000,000
Short-term U.S. government and agency obligations, value	[2],[4]		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	[2],[4]		47,000,000
Short-term U.S. government and agency obligations, value	[2],[4]		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	[2],[4]		41,000,000
Short-term U.S. government and agency obligations, value	[2],[4]		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	[2],[4]		61,000,000
Short-term U.S. government and agency obligations, value	[2],[4]		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	[2],[4]		29,000,000
Short-term U.S. government and agency obligations, value	[2],[4]		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	[2],[4]		50,000,000
Short-term U.S. government and agency obligations, value	[2],[4]		49,882,640
ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations, value		8,380,427	50,961,356
ProShares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 1.271% due 03/15/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2]		3,000,000
Short-term U.S. government and agency obligations, value	[2]		2,992,260
ProShares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 1.635% due 01/03/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	800,000
Short-term U.S. government and agency obligations, value	[1]	799,951
ProShares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 1.884% due 01/17/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	700,000
Short-term U.S. government and agency obligations, value	[1]	699,329
ProShares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 1.924% due 01/31/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	900,000
Short-term U.S. government and agency obligations, value	[1]	898,347
ProShares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 2.362% due 02/14/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	6,000,000
Short-term U.S. government and agency obligations, value	[1]	5,982,800
ProShares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 1.000% due 01/04/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2]		16,000,000
Short-term U.S. government and agency obligations, value	[2]		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	[2]		9,000,000
Short-term U.S. government and agency obligations, value	[2]		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	[2]		6,000,000
Short-term U.S. government and agency obligations, value	[2]		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	[2]		8,000,000
Short-term U.S. government and agency obligations, value	[2]		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	[2]		9,000,000
Short-term U.S. government and agency obligations, value	[2]		8,984,127
ProShares Ultra Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations, value		1,496,658	6,996,235
ProShares Ultra Euro [Member] | U.S. Treasury Bills 1.033% Due 01/18/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2],[5]		7,000,000
Short-term U.S. government and agency obligations, value	[2],[5]		6,996,235
ProShares Ultra Euro [Member] | U.S. Treasury Bills 1.635% due 01/03/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	200,000
Short-term U.S. government and agency obligations, value	[1]	199,988
ProShares Ultra Euro [Member] | U.S. Treasury Bills 1.884% due 01/17/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	100,000
Short-term U.S. government and agency obligations, value	[1]	99,904
ProShares Ultra Euro [Member] | U.S. Treasury Bills 1.924% due 01/31/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	200,000
Short-term U.S. government and agency obligations, value	[1]	199,633
ProShares Ultra Euro [Member] | U.S. Treasury Bills 2.427% due 02/14/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	1,000,000
Short-term U.S. government and agency obligations, value	[1]	997,133
ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations, value		41,941,734	88,884,844
ProShares Ultra Gold [Member] | U.S. Treasury Bills 1.080% due 02/15/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2],[6]		15,000,000
Short-term U.S. government and agency obligations, value	[2],[6]		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	[2],[6]		8,000,000
Short-term U.S. government and agency obligations, value	[2],[6]		7,973,914
ProShares Ultra Gold [Member] | U.S. Treasury Bills 1.607% due 01/03/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[6]	2,000,000
Short-term U.S. government and agency obligations, value	[1],[6]	1,999,877
ProShares Ultra Gold [Member] | U.S. Treasury Bills 1.000% due 01/04/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2]		16,000,000
Short-term U.S. government and agency obligations, value	[2]		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	[2],[6]		12,000,000
Short-term U.S. government and agency obligations, value	[2],[6]		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	[2],[6]		10,000,000
Short-term U.S. government and agency obligations, value	[2],[6]		9,994,622
ProShares Ultra Gold [Member] | U.S. Treasury Bills 2.307% due 01/17/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[6]	28,000,000
Short-term U.S. government and agency obligations, value	[1],[6]	27,973,167
ProShares Ultra Gold [Member] | U.S. Treasury Bills 1.898% due 01/31/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[6]	3,000,000
Short-term U.S. government and agency obligations, value	[1],[6]	2,994,490
ProShares Ultra Gold [Member] | U.S. Treasury Bills 2.349% due 02/14/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[6]	9,000,000
Short-term U.S. government and agency obligations, value	[1],[6]	8,974,200
ProShares Ultra Gold [Member] | U.S. Treasury Bills 1.075% due 02/08/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2],[6]		12,000,000
Short-term U.S. government and agency obligations, value	[2],[6]		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	[2],[6]		16,000,000
Short-term U.S. government and agency obligations, value	[2],[6]		15,958,720
ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations, value		123,795,806	235,581,716
ProShares Ultra Silver [Member] | U.S. Treasury Bills 1.080% due 02/15/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2],[6]		20,000,000
Short-term U.S. government and agency obligations, value	[2],[6]		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	[2],[6]		9,000,000
Short-term U.S. government and agency obligations, value	[2],[6]		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	[2],[6]		7,000,000
Short-term U.S. government and agency obligations, value	[2],[6]		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	[2]		5,000,000
Short-term U.S. government and agency obligations, value	[2]		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	[2],[6]		11,000,000
Short-term U.S. government and agency obligations, value	[2],[6]		10,964,131
ProShares Ultra Silver [Member] | U.S. Treasury Bills 1.607% due 01/03/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[6]	8,000,000
Short-term U.S. government and agency obligations, value	[1],[6]	7,999,508
ProShares Ultra Silver [Member] | United States Treasury Bills 1.001% due 01/04/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2],[6]		39,000,000
Short-term U.S. government and agency obligations, value	[2],[6]		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	[2],[6]		15,000,000
Short-term U.S. government and agency obligations, value	[2],[6]		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	[2],[6]		15,000,000
Short-term U.S. government and agency obligations, value	[2],[6]		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	[2],[6]		25,000,000
Short-term U.S. government and agency obligations, value	[2],[6]		24,968,140
ProShares Ultra Silver [Member] | U.S. Treasury Bills 2.285% due 01/17/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[6]	47,000,000
Short-term U.S. government and agency obligations, value	[1],[6]	46,954,960
ProShares Ultra Silver [Member] | U.S. Treasury Bills 2.241% due 01/31/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[6]	38,000,000
Short-term U.S. government and agency obligations, value	[1],[6]	37,930,206
ProShares Ultra Silver [Member] | U.S. Treasury Bills 2.364% due 02/14/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[6]	31,000,000
Short-term U.S. government and agency obligations, value	[1],[6]	30,911,132
ProShares Ultra Silver [Member] | United States Treasury Bills 1.126% due 02/01/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2],[6]		30,000,000
Short-term U.S. government and agency obligations, value	[2],[6]		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	[2],[6]		10,000,000
Short-term U.S. government and agency obligations, value	[2],[6]		9,979,458
ProShares Ultra Silver [Member] | U.S. Treasury Bills 1.292% due 04/05/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2]		50,000,000
Short-term U.S. government and agency obligations, value	[2]		49,821,750
Proshares UltraPro 3x Crude Oil ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations, value		20,979,876
Proshares UltraPro 3x Crude Oil ETF [Member] | U.S. Treasury Bills 2.342% due 01/17/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	21,000,000
Short-term U.S. government and agency obligations, value	[1]	20,979,876
ProShares UltraShort Australian Dollar [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations, value		299,537	11,983,904
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 1.033% Due 01/18/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2]		7,000,000
Short-term U.S. government and agency obligations, value	[2]		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	[2]		2,000,000
Short-term U.S. government and agency obligations, value	[2]		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	[2]		3,000,000
Short-term U.S. government and agency obligations, value	[2]		2,990,218
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 1.884% due 01/17/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	100,000
Short-term U.S. government and agency obligations, value	[1]	99,904
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 1.924% due 01/31/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	200,000
Short-term U.S. government and agency obligations, value	[1]	199,633
ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations, value		27,967,534	253,646,823
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.080% due 02/15/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2],[4]		28,000,000
Short-term U.S. government and agency obligations, value	[2],[4]		27,957,563
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.145% Due 02/22/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2],[4]		48,000,000
Short-term U.S. government and agency obligations, value	[2],[4]		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	[2],[4]		14,000,000
Short-term U.S. government and agency obligations, value	[2],[4]		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	[2],[4]		29,000,000
Short-term U.S. government and agency obligations, value	[2],[4]		28,905,437
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.607% due 01/03/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[4]	5,000,000
Short-term U.S. government and agency obligations, value	[1],[4]	4,999,692
ProShares UltraShort Bloomberg Crude Oil [Member] | United States Treasury Bills 1.001% due 01/04/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2],[4]		64,000,000
Short-term U.S. government and agency obligations, value	[2],[4]		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	[2],[4]		28,000,000
Short-term U.S. government and agency obligations, value	[2],[4]		27,971,068
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 2.427% due 02/14/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[4]	3,000,000
Short-term U.S. government and agency obligations, value	[1],[4]	2,991,400
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.898% due 01/31/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[4]	5,000,000
Short-term U.S. government and agency obligations, value	[1],[4]	4,990,817
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.075% due 02/08/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2],[4]		17,000,000
Short-term U.S. government and agency obligations, value	[2],[4]		16,978,335
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 2.212% due 01/17/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[4]	15,000,000
Short-term U.S. government and agency obligations, value	[1],[4]	14,985,625
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 1.068% due 01/25/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2],[4]		10,000,000
Short-term U.S. government and agency obligations, value	[2],[4]		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	[2],[4]		16,000,000
Short-term U.S. government and agency obligations, value	[2],[4]		15,967,133
ProShares UltraShort Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations, value		299,714	3,999,751
ProShares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 1.635% due 01/03/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	100,000
Short-term U.S. government and agency obligations, value	[1]	99,994
ProShares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 1.884% due 01/17/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	100,000
Short-term U.S. government and agency obligations, value	[1]	99,904
ProShares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 1.924% due 01/31/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	100,000
Short-term U.S. government and agency obligations, value	[1]	99,816
ProShares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 1.000% due 01/04/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2]		4,000,000
Short-term U.S. government and agency obligations, value	[2]		3,999,751
ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations, value		121,801,685	204,770,166
ProShares UltraShort Euro [Member] | U.S.Treasury Bills 1.689% due 01/03/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[5]	6,000,000
Short-term U.S. government and agency obligations, value	[1],[5]	5,999,631
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 1.080% due 02/15/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2],[5]		25,000,000
Short-term U.S. government and agency obligations, value	[2],[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	[2]		12,000,000
Short-term U.S. government and agency obligations, value	[2]		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	[2],[5]		26,000,000
Short-term U.S. government and agency obligations, value	[2],[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	[2],[5]		18,000,000
Short-term U.S. government and agency obligations, value	[2],[5]		17,957,750
ProShares UltraShort Euro [Member] | United States Treasury Bills 1.001% due 01/04/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2]		20,000,000
Short-term U.S. government and agency obligations, value	[2]		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	[2],[5]		25,000,000
Short-term U.S. government and agency obligations, value	[2],[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	[2],[5]		30,000,000
Short-term U.S. government and agency obligations, value	[2],[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	[2],[5]		9,000,000
Short-term U.S. government and agency obligations, value	[2],[5]		8,988,530
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 1.068% due 01/25/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2],[5]		11,000,000
Short-term U.S. government and agency obligations, value	[2],[5]		10,991,251
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 2.305% due 01/17/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[5]	43,000,000
Short-term U.S. government and agency obligations, value	[1],[5]	42,958,793
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 2.297% due 01/31/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[5]	51,000,000
Short-term U.S. government and agency obligations, value	[1],[5]	50,906,328
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 2.363% due 02/14/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[5]	22,000,000
Short-term U.S. government and agency obligations, value	[1],[5]	21,936,933
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 1.081% due 01/18/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2],[5]		29,000,000
Short-term U.S. government and agency obligations, value	[2],[5]		28,984,404
ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations, value		3,989,563	31,977,900
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 1.267% Due 03/29/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2],[6]		2,000,000
Short-term U.S. government and agency obligations, value	[2],[6]		1,993,478
ProShares UltraShort Gold [Member] | United States Treasury Bills 1.001% due 01/04/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2],[6]		14,000,000
Short-term U.S. government and agency obligations, value	[2],[6]		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	[2],[6]		5,000,000
Short-term U.S. government and agency obligations, value	[2],[6]		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	[2],[6]		3,000,000
Short-term U.S. government and agency obligations, value	[2],[6]		2,996,900
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 1.075% due 02/08/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2],[6]		8,000,000
Short-term U.S. government and agency obligations, value	[2],[6]		7,989,805
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 1.885% due 01/31/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[6]	1,000,000
Short-term U.S. government and agency obligations, value	[1],[6]	998,163
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 2.349% due 02/14/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[6]	3,000,000
Short-term U.S. government and agency obligations, value	[1],[6]	2,991,400
ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations, value		3,294,766	18,349,861
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 1.033% Due 01/18/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2],[6]		2,181,000
Short-term U.S. government and agency obligations, value	[2],[6]		2,179,827
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 1.209% Due 02/08/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2],[6]		2,000,000
Short-term U.S. government and agency obligations, value	[2],[6]		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	[2],[6]		12,000,000
Short-term U.S. government and agency obligations, value	[2],[6]		11,960,871
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 1.607% due 01/03/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	700,000
Short-term U.S. government and agency obligations, value	[1]	699,957
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 1.040% due 02/01/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2],[6]		2,214,000
Short-term U.S. government and agency obligations, value	[2],[6]		2,211,712
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 2.427% due 02/14/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	1,000,000
Short-term U.S. government and agency obligations, value	[1]	997,133
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 1.898% due 01/31/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[6]	900,000
Short-term U.S. government and agency obligations, value	[1],[6]	898,347
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 1.856% due 01/17/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	700,000
Short-term U.S. government and agency obligations, value	[1]	699,329
ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations, value		34,951,229	131,834,352
ProShares UltraShort Yen [Member] | U.S.Treasury Bills 1.689% due 01/03/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[5]	2,000,000
Short-term U.S. government and agency obligations, value	[1],[5]	1,999,877
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 1.976% due 01/31/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[5]	2,000,000
Short-term U.S. government and agency obligations, value	[1],[5]	1,996,327
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 1.033% Due 01/18/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2],[5]		19,000,000
Short-term U.S. government and agency obligations, value	[2],[5]		18,989,782
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 1.080% due 02/15/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2]		9,000,000
Short-term U.S. government and agency obligations, value	[2]		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	[2],[5]		15,000,000
Short-term U.S. government and agency obligations, value	[2],[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	[2]		6,000,000
Short-term U.S. government and agency obligations, value	[2]		5,982,422
ProShares UltraShort Yen [Member] | United States Treasury Bills 1.001% due 01/04/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2]		7,000,000
Short-term U.S. government and agency obligations, value	[2]		6,999,565
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 1.001% due 01/11/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2]		9,000,000
Short-term U.S. government and agency obligations, value	[2]		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	[2],[5]		24,000,000
Short-term U.S. government and agency obligations, value	[2],[5]		23,975,201
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 2.307% due 01/17/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[5]	23,000,000
Short-term U.S. government and agency obligations, value	[1],[5]	22,977,959
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 1.068% due 01/25/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2],[5]		11,000,000
Short-term U.S. government and agency obligations, value	[2],[5]		10,991,251
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 2.349% due 02/14/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[5]	8,000,000
Short-term U.S. government and agency obligations, value	[1],[5]	7,977,066
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 1.083% due 02/08/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2],[5]		17,000,000
Short-term U.S. government and agency obligations, value	[2],[5]		16,978,335
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 1.264% due 03/01/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2]		15,000,000
Short-term U.S. government and agency obligations, value	[2]		14,969,187
ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations, value			20,993,515
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	[2]		3,000,000
Short-term U.S. government and agency obligations, value	[2]		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	[2]		11,000,000
Short-term U.S. government and agency obligations, value	[2]		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	[2]		7,000,000
Short-term U.S. government and agency obligations, value	[2]		6,998,022
ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations, value		114,785,002	134,845,604
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	[2],[3]		34,000,000
Short-term U.S. government and agency obligations, value	[2],[3]		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	[2],[3]		23,000,000
Short-term U.S. government and agency obligations, value	[2],[3]		22,940,660
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	[2]		31,000,000
Short-term U.S. government and agency obligations, value	[2]		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	[2],[3]		12,000,000
Short-term U.S. government and agency obligations, value	[2],[3]		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	[2],[3]		33,000,000
Short-term U.S. government and agency obligations, value	[2],[3]		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	[2],[3]		2,000,000
Short-term U.S. government and agency obligations, value	[2],[3]		1,995,891
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 2.314% due 01/17/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[3]	50,000,000
Short-term U.S. government and agency obligations, value	[1],[3]	49,952,085
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 2.326% due 01/31/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1],[3]	40,000,000
Short-term U.S. government and agency obligations, value	[1],[3]	39,926,532
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 2.389% due 02/28/19 [Member]
Schedule of Investments [Line Items]
Principal Amount	[1]	25,000,000
Short-term U.S. government and agency obligations, value	[1]	$ 24,906,385
ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations, value			287,533,132
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	[2],[3]		12,000,000
Short-term U.S. government and agency obligations, value	[2],[3]		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	[2],[3]		11,000,000
Short-term U.S. government and agency obligations, value	[2],[3]		10,964,131
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	[2],[3]		25,000,000
Short-term U.S. government and agency obligations, value	[2],[3]		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	[2],[3]		48,000,000
Short-term U.S. government and agency obligations, value	[2],[3]		47,986,440
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 1.292% due 04/05/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2],[3]		20,000,000
Short-term U.S. government and agency obligations, value	[2],[3]		19,928,700
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	[2],[3]		40,000,000
Short-term U.S. government and agency obligations, value	[2],[3]		39,917,832
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	[2],[3]		34,000,000
Short-term U.S. government and agency obligations, value	[2],[3]		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	[2],[3]		22,000,000
Short-term U.S. government and agency obligations, value	[2],[3]		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	[2],[3]		45,000,000
Short-term U.S. government and agency obligations, value	[2],[3]		44,942,652
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	[2],[3]		31,000,000
Short-term U.S. government and agency obligations, value	[2],[3]		30,920,020
ProShares Ultra Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations, value			1,997,933
ProShares Ultra Yen [Member] | U.S. Treasury Bills 1.040% due 02/01/18 [Member]
Schedule of Investments [Line Items]
Principal Amount	[2],[5]		2,000,000
Short-term U.S. government and agency obligations, value	[2],[5]		$ 1,997,933
[1]	Rates shown represent discount rate at the time of purchase.
[2]	Rates shown represents discount rate at the time of purchase.
[3]	All or partial amount pledged as collateral for futures contracts.
[4]	All or partial amount pledged as collateral for swap agreements.
[5]	All or partial amount pledged as collateral for foreign currency forward contracts.
[6]	All or partial amount pledged as collateral for forward agreements.

Schedule of Investments - Sho_2

Schedule of Investments - Short-Term U.S. Government and Agency Obligations (Parenthetical) (Detail) - U.S. Government Agencies Short-term Debt Securities [Member] - USD ($)		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Schedule of Investments [Line Items]
Total short-term U.S. government and agency obligations, cost		$ 785,069,552	$ 2,445,970,899
ProShares Short Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		7.00%	88.00%
Total short-term U.S. government and agency obligations, cost		$ 599,431	$ 6,996,595
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%
Total short-term U.S. government and agency obligations, cost			$ 494,962,509
ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		76.00%	88.00%
Total short-term U.S. government and agency obligations, cost		$ 280,497,709	$ 459,543,053
ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		57.00%	81.00%
Total short-term U.S. government and agency obligations, cost		$ 8,380,716	$ 50,963,586
ProShares Ultra Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		20.00%	73.00%
Total short-term U.S. government and agency obligations, cost		$ 1,496,665	$ 6,996,595
ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		50.00%	95.00%
Total short-term U.S. government and agency obligations, cost		$ 41,941,207	$ 88,890,367
ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		61.00%	91.00%
Total short-term U.S. government and agency obligations, cost		$ 123,793,893	$ 235,605,469
Proshares UltraPro 3x Crude Oil ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		24.00%
Total short-term U.S. government and agency obligations, cost		$ 20,979,000
ProShares UltraShort Australian Dollar [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		3.00%	87.00%
Total short-term U.S. government and agency obligations, cost		$ 299,548	$ 11,984,898
ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		24.00%	112.00%
Total short-term U.S. government and agency obligations, cost		$ 27,967,127	$ 253,669,155
ProShares UltraShort Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		2.00%	58.00%
Total short-term U.S. government and agency obligations, cost		$ 299,715	$ 3,999,667
ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		79.00%	101.00%
Total short-term U.S. government and agency obligations, cost		$ 121,798,837	$ 204,788,208
ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		22.00%	102.00%
Total short-term U.S. government and agency obligations, cost		$ 3,989,775	$ 31,979,626
ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		28.00%	124.00%
Total short-term U.S. government and agency obligations, cost		$ 3,294,789	$ 18,352,808
ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		63.00%	101.00%
Total short-term U.S. government and agency obligations, cost		$ 34,950,807	$ 131,844,652
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%
Total short-term U.S. government and agency obligations, cost			$ 20,993,328
ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity		77.00%	98.00%
Total short-term U.S. government and agency obligations, cost		$ 114,780,333	$ 134,855,770
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%
Total short-term U.S. government and agency obligations, cost			$ 287,546,397
ProShares Ultra Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity			70.00%
Total short-term U.S. government and agency obligations, cost			$ 1,998,216
U.S.Treasury Bills 1.689% due 01/03/19 [Member] | ProShares Short Euro [Member]
Schedule of Investments [Line Items]
Interest rate	[1]	1.689%
Discount rate at the time of purchase	[2]	true
Investment, maturity date	[2]	Jan. 3, 2019
U.S.Treasury Bills 1.689% due 01/03/19 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Interest rate	[1],[3]	1.689%
Discount rate at the time of purchase	[1],[3]	true
Investment, maturity date	[1],[3]	Jan. 3, 2019
U.S.Treasury Bills 1.689% due 01/03/19 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Interest rate	[1],[3]	1.689%
Discount rate at the time of purchase	[1],[3]	true
Investment, maturity date	[1],[3]	Jan. 3, 2019
U.S. Treasury Bills 1.941% due 01/17/19 [Member] | ProShares Short Euro [Member]
Schedule of Investments [Line Items]
Interest rate	[2]	1.941%
Discount rate at the time of purchase	[2]	true
Investment, maturity date	[2]	Jan. 17, 2019
U.S. Treasury Bills 1.976% due 01/31/19 [Member] | ProShares Short Euro [Member]
Schedule of Investments [Line Items]
Interest rate	[2]	1.976%
Discount rate at the time of purchase	[2]	true
Investment, maturity date	[2]	Jan. 31, 2019
U.S. Treasury Bills 1.976% due 01/31/19 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Interest rate	[1],[3]	1.976%
Discount rate at the time of purchase	[1],[3]	true
Investment, maturity date	[1],[3]	Jan. 31, 2019
U.S. Treasury Bills 1.033% Due 01/18/18 [Member] | ProShares Short Euro [Member]
Schedule of Investments [Line Items]
Interest rate	[2]		1.033%
Discount rate at the time of purchase	[2]		true
Investment, maturity date	[2]		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]
Interest rate	[2],[4]		1.033%
Discount rate at the time of purchase	[2],[4]		true
Investment, maturity date	[2],[4]		Jan. 18, 2018
U.S. Treasury Bills 1.033% Due 01/18/18 [Member] | ProShares Ultra Euro [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[3]		1.033%
Discount rate at the time of purchase	[2],[3]		true
Investment, maturity date	[2],[3]		Jan. 18, 2018
U.S. Treasury Bills 1.033% Due 01/18/18 [Member] | ProShares UltraShort Australian Dollar [Member]
Schedule of Investments [Line Items]
Interest rate	[2]		1.033%
Discount rate at the time of purchase	[2]		true
Investment, maturity date	[2]		Jan. 18, 2018
U.S. Treasury Bills 1.033% Due 01/18/18 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[5]		1.033%
Discount rate at the time of purchase	[2],[5]		true
Investment, maturity date	[2],[5]		Jan. 18, 2018
U.S. Treasury Bills 1.033% Due 01/18/18 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[3]		1.033%
Discount rate at the time of purchase	[2],[3]		true
Investment, maturity date	[2],[3]		Jan. 18, 2018
U.S. Treasury Bills 1.209% Due 02/08/18 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[6]		1.209%
Discount rate at the time of purchase	[2],[6]		true
Investment, maturity date	[2],[6]		Feb. 8, 2018
U.S. Treasury Bills 1.209% Due 02/08/18 [Member] | ProShares UltraShort Australian Dollar [Member]
Schedule of Investments [Line Items]
Interest rate	[2]		1.209%
Discount rate at the time of purchase	[2]		true
Investment, maturity date	[2]		Feb. 8, 2018
U.S. Treasury Bills 1.209% Due 02/08/18 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[5]		1.209%
Discount rate at the time of purchase	[2],[5]		true
Investment, maturity date	[2],[5]		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]
Interest rate	[2]		1.209%
Discount rate at the time of purchase			true
Investment, maturity date	[2]		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]
Interest rate	[2]		1.08%
Discount rate at the time of purchase	[2]		true
Investment, maturity date	[2]		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]
Interest rate	[2],[4]		1.08%
Discount rate at the time of purchase	[2],[4]		true
Investment, maturity date	[2],[4]		Feb. 15, 2018
U.S. Treasury Bills 1.080% due 02/15/18 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Interest rate			1.08%
Discount rate at the time of purchase			true
Investment, maturity date			Feb. 15, 2018
U.S. Treasury Bills 1.080% due 02/15/18 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[5]		1.08%
Discount rate at the time of purchase	[2],[5]		true
Investment, maturity date	[2],[5]		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]
Interest rate	[2],[4]		1.08%
Discount rate at the time of purchase	[2],[4]		true
Investment, maturity date	[2],[4]		Feb. 15, 2018
U.S. Treasury Bills 1.080% due 02/15/18 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[3]		1.08%
Discount rate at the time of purchase	[2],[3]		true
Investment, maturity date	[2],[3]		Feb. 15, 2018
U.S. Treasury Bills 1.080% due 02/15/18 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Interest rate	[2]		1.08%
Discount rate at the time of purchase	[2]		true
Investment, maturity date	[2]		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]
Interest rate	[2],[6]		1.08%
Discount rate at the time of purchase	[2],[6]		true
Investment, maturity date	[2],[6]		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]
Interest rate	[2],[6]		1.08%
Discount rate at the time of purchase	[2],[6]		true
Investment, maturity date	[2],[6]		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]
Interest rate	[2],[6]		1.145%
Discount rate at the time of purchase	[2],[6]		true
Investment, maturity date	[2],[6]		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]
Interest rate	[2],[4]		1.145%
Discount rate at the time of purchase	[2],[4]		true
Investment, maturity date	[2],[4]		Feb. 22, 2018
U.S. Treasury Bills 1.145% Due 02/22/18 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[5]		1.145%
Discount rate at the time of purchase	[2],[5]		true
Investment, maturity date	[2],[5]		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]
Interest rate	[2],[4]		1.145%
Discount rate at the time of purchase	[2],[4]		true
Investment, maturity date	[2],[4]		Feb. 22, 2018
U.S. Treasury Bills 1.145% Due 02/22/18 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Interest rate	[2]		1.145%
Discount rate at the time of purchase	[2]		true
Investment, maturity date	[2]		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]
Interest rate	[2]		1.155%
Discount rate at the time of purchase	[2]		true
Investment, maturity date	[2]		Mar. 1, 2018
U.S. Treasury Bills 1.155% Due 03/01/18 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[3]		1.155%
Discount rate at the time of purchase	[2],[3]		true
Investment, maturity date	[2],[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]
Interest rate	[2]		1.256%
Discount rate at the time of purchase	[2]		true
Investment, maturity date	[2]		Mar. 8, 2018
U.S. Treasury Bills 1.256% due 03/08/18 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[3]		1.256%
Discount rate at the time of purchase	[2],[3]		true
Investment, maturity date	[2],[3]		Mar. 8, 2018
U.S. Treasury Bills 1.256% due 03/08/18 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[3]		1.256%
Discount rate at the time of purchase	[2],[3]		true
Investment, maturity date	[2],[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]
Interest rate	[2]		1.271%
Discount rate at the time of purchase	[2]		true
Investment, maturity date	[2]		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]
Interest rate	[2]		1.271%
Discount rate at the time of purchase	[2]		true
Investment, maturity date	[2]		Mar. 15, 2018
U.S. Treasury Bills 1.271% due 03/15/18 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[5]		1.271%
Discount rate at the time of purchase	[2],[5]		true
Investment, maturity date	[2],[5]		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]
Interest rate	[2],[4]		1.271%
Discount rate at the time of purchase	[2],[4]		true
Investment, maturity date	[2],[4]		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]
Interest rate	[2],[6]		1.271%
Discount rate at the time of purchase	[2],[6]		true
Investment, maturity date	[2],[6]		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]
Interest rate	[2]		1.277%
Discount rate at the time of purchase	[2]		true
Investment, maturity date	[2]		Mar. 22, 2018
U.S. Treasury Bills 1.277% Due 03/22/18 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Interest rate	[2]		1.277%
Discount rate at the time of purchase	[2]		true
Investment, maturity date	[2]		Mar. 22, 2018
U.S. Treasury Bills 1.277% Due 03/22/18 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Interest rate	[2]		1.277%
Discount rate at the time of purchase	[2]		true
Investment, maturity date	[2]		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]
Interest rate	[2]		1.267%
Discount rate at the time of purchase	[2]		true
Investment, maturity date	[2]		Mar. 29, 2018
U.S. Treasury Bills 1.267% Due 03/29/18 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Interest rate			1.267%
Discount rate at the time of purchase			true
Investment, maturity date			Mar. 29, 2018
U.S. Treasury Bills 1.267% Due 03/29/18 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[5]		1.267%
Discount rate at the time of purchase	[2],[5]		true
Investment, maturity date	[2],[5]		Mar. 29, 2018
U.S. Treasury Bills 1.267% Due 03/29/18 [Member] | ProShares UltraShort Australian Dollar [Member]
Schedule of Investments [Line Items]
Interest rate	[2]		1.267%
Discount rate at the time of purchase	[2]		true
Investment, maturity date	[2]		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]
Interest rate	[2],[4]		1.267%
Discount rate at the time of purchase	[2],[4]		true
Investment, maturity date	[2],[4]		Mar. 29, 2018
U.S. Treasury Bills 1.267% Due 03/29/18 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[5]		1.267%
Discount rate at the time of purchase	[2],[5]		true
Investment, maturity date	[2],[5]		Mar. 29, 2018
U.S. Treasury Bills 1.267% Due 03/29/18 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[5]		1.267%
Discount rate at the time of purchase	[2],[5]		true
Investment, maturity date	[2],[5]		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]
Interest rate	[2],[6]		1.267%
Discount rate at the time of purchase	[2],[6]		true
Investment, maturity date	[2],[6]		Mar. 29, 2018
U.S. Treasury Bills 1.607% due 01/03/19 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate		1.607%
Discount rate at the time of purchase		true
Investment, maturity date		Jan. 3, 2019
U.S. Treasury Bills 1.607% due 01/03/19 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Interest rate	[1],[5]	1.607%
Discount rate at the time of purchase	[1],[5]	true
Investment, maturity date	[1],[5]	Jan. 3, 2019
U.S. Treasury Bills 1.607% due 01/03/19 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Interest rate	[1],[5]	1.607%
Discount rate at the time of purchase	[1],[5]	true
Investment, maturity date	[1],[5]	Jan. 3, 2019
U.S. Treasury Bills 1.607% due 01/03/19 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate	[1],[4]	1.607%
Discount rate at the time of purchase	[1],[4]	true
Investment, maturity date	[1],[4]	Jan. 3, 2019
U.S. Treasury Bills 1.607% due 01/03/19 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Interest rate	[1]	1.607%
Discount rate at the time of purchase	[1]	true
Investment, maturity date	[1]	Jan. 3, 2019
U.S. Treasury Bills 2.287% due 01/17/19 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate		2.287%
Discount rate at the time of purchase		true
Investment, maturity date		Jan. 17, 2019
U.S. Treasury Bills 2.260% due 01/31/19 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate		2.26%
Discount rate at the time of purchase		true
Investment, maturity date		Jan. 31, 2019
U.S. Treasury Bills 2.400% due 02/14/19 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate		2.40%
Discount rate at the time of purchase		true
Investment, maturity date		Feb. 14, 2019
United States Treasury Bills 1.001% due 01/04/18 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[4]		1.001%
Discount rate at the time of purchase	[2],[4]		true
Investment, maturity date	[2],[4]		Jan. 4, 2018
United States Treasury Bills 1.001% due 01/04/18 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[5]		1.001%
Discount rate at the time of purchase	[2],[5]		true
Investment, maturity date	[2],[5]		Jan. 4, 2018
United States Treasury Bills 1.001% due 01/04/18 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[4]		1.001%
Discount rate at the time of purchase	[2],[4]		true
Investment, maturity date	[2],[4]		Jan. 4, 2018
United States Treasury Bills 1.001% due 01/04/18 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Interest rate	[2]		1.001%
Discount rate at the time of purchase	[2]		true
Investment, maturity date	[2]		Jan. 4, 2018
United States Treasury Bills 1.001% due 01/04/18 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[5]		1.001%
Discount rate at the time of purchase	[2],[5]		true
Investment, maturity date	[2],[5]		Jan. 4, 2018
United States Treasury Bills 1.001% due 01/04/18 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Interest rate	[2]		1.00%
Discount rate at the time of purchase	[2]		true
Investment, maturity date	[2]		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]
Interest rate	[2],[4]		1.022%
Discount rate at the time of purchase	[2],[4]		true
Investment, maturity date	[2],[4]		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]
Interest rate	[2],[4]		1.082%
Discount rate at the time of purchase	[2],[4]		true
Investment, maturity date	[2],[4]		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]
Interest rate	[2],[4]		1.146%
Discount rate at the time of purchase	[2],[4]		true
Investment, maturity date	[2],[4]		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]
Interest rate	[2],[4]		1.118%
Discount rate at the time of purchase	[2],[4]		true
Investment, maturity date	[2],[4]		Feb. 8, 2018
United States Treasury Bills1.223% due 03/01/18 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[4]		1.223%
Discount rate at the time of purchase	[2],[4]		true
Investment, maturity date	[2],[4]		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]
Interest rate	[2],[4]		1.256%
Discount rate at the time of purchase	[2],[4]		true
Investment, maturity date	[2],[4]		Mar. 8, 2018
United States Treasury Bills 1.256% due 03/08/18 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[5]		1.256%
Discount rate at the time of purchase	[2],[5]		true
Investment, maturity date	[2],[5]		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]
Interest rate	[2],[6]		1.256%
Discount rate at the time of purchase	[2],[6]		true
Investment, maturity date	[2],[6]		Mar. 8, 2018
U.S. Treasury Bills 1.635% due 01/03/19 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate	[1]	1.635%
Discount rate at the time of purchase	[1]	true
Investment, maturity date	[1]	Jan. 3, 2019
U.S. Treasury Bills 1.635% due 01/03/19 [Member] | ProShares Ultra Euro [Member]
Schedule of Investments [Line Items]
Interest rate	[1]	1.635%
Discount rate at the time of purchase	[1]	true
Investment, maturity date	[1]	Jan. 3, 2019
U.S. Treasury Bills 1.635% due 01/03/19 [Member] | ProShares UltraShort Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate	[1]	1.635%
Discount rate at the time of purchase	[1]	true
Investment, maturity date	[1]	Jan. 3, 2019
U.S. Treasury Bills 1.884% due 01/17/19 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate	[1]	1.884%
Discount rate at the time of purchase	[1]	true
Investment, maturity date	[1]	Jan. 17, 2019
U.S. Treasury Bills 1.884% due 01/17/19 [Member] | ProShares Ultra Euro [Member]
Schedule of Investments [Line Items]
Interest rate	[1]	1.884%
Discount rate at the time of purchase	[1]	true
Investment, maturity date	[1]	Jan. 17, 2019
U.S. Treasury Bills 1.884% due 01/17/19 [Member] | ProShares UltraShort Australian Dollar [Member]
Schedule of Investments [Line Items]
Interest rate	[1]	1.884%
Discount rate at the time of purchase	[1]	true
Investment, maturity date	[1]	Jan. 17, 2019
U.S. Treasury Bills 1.884% due 01/17/19 [Member] | ProShares UltraShort Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate	[1]	1.884%
Discount rate at the time of purchase	[1]	true
Investment, maturity date	[1]	Jan. 17, 2019
U.S. Treasury Bills 1.924% due 01/31/19 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate	[1]	1.924%
Discount rate at the time of purchase	[1]	true
Investment, maturity date	[1]	Jan. 31, 2019
U.S. Treasury Bills 1.924% due 01/31/19 [Member] | ProShares Ultra Euro [Member]
Schedule of Investments [Line Items]
Interest rate	[1]	1.924%
Discount rate at the time of purchase	[1]	true
Investment, maturity date	[1]	Jan. 31, 2019
U.S. Treasury Bills 1.924% due 01/31/19 [Member] | ProShares UltraShort Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate	[1]	1.924%
Discount rate at the time of purchase	[1]	true
Investment, maturity date	[1]	Jan. 31, 2019
U.S. Treasury Bills 2.362% due 02/14/19 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate	[1]	2.362%
Discount rate at the time of purchase	[1]	true
Investment, maturity date	[1]	Feb. 14, 2019
U.S. Treasury Bills 1.000% due 01/04/18 [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate	[2]		1.00%
Discount rate at the time of purchase	[2]		true
Investment, maturity date	[2]		Jan. 4, 2018
U.S. Treasury Bills 1.000% due 01/04/18 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Interest rate			1.00%
Discount rate at the time of purchase			true
Investment, maturity date			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]
Interest rate	[2]		1.00%
Discount rate at the time of purchase	[2]		true
Investment, maturity date	[2]		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]
Interest rate	[2]		1.00%
Discount rate at the time of purchase	[2]		true
Investment, maturity date			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]
Interest rate	[2]		1.00%
Discount rate at the time of purchase	[2]		true
Investment, maturity date	[2]		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]
Interest rate	[2]		1.001%
Discount rate at the time of purchase	[2]		true
Investment, maturity date	[2]		Jan. 11, 2018
U.S. Treasury Bills 1.001% due 01/11/18 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Interest rate			1.001%
Discount rate at the time of purchase			true
Investment, maturity date			Jan. 11, 2018
U.S. Treasury Bills 1.001% due 01/11/18 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[5]		1.001%
Discount rate at the time of purchase	[2],[5]		true
Investment, maturity date	[2],[5]		Jan. 11, 2018
U.S. Treasury Bills 1.001% due 01/11/18 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[3]		1.001%
Discount rate at the time of purchase	[2],[3]		true
Investment, maturity date	[2],[3]		Jan. 11, 2018
U.S. Treasury Bills 1.001% due 01/11/18 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[5]		1.001%
Discount rate at the time of purchase	[2],[5]		true
Investment, maturity date	[2],[5]		Jan. 11, 2018
U.S. Treasury Bills 1.001% due 01/11/18 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Interest rate	[2]		1.001%
Discount rate at the time of purchase	[2]		true
Investment, maturity date	[2]		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]
Interest rate	[2]		1.001%
Discount rate at the time of purchase			true
Investment, maturity date	[2]		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]
Interest rate	[2],[6]		1.001%
Discount rate at the time of purchase	[2],[6]		true
Investment, maturity date	[2],[6]		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]
Interest rate	[2],[6]		1.001%
Discount rate at the time of purchase	[2],[6]		true
Investment, maturity date	[2],[6]		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]
Interest rate	[2]		1.033%
Discount rate at the time of purchase	[2]		true
Investment, maturity date	[2]		Jan. 18, 2018
U.S. Treasury Bills 1.033% due 01/18/18 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Interest rate			1.033%
Discount rate at the time of purchase			true
Investment, maturity date			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]
Interest rate	[2]		1.04%
Discount rate at the time of purchase	[2]		true
Investment, maturity date	[2]		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]
Interest rate	[2],[4]		1.04%
Discount rate at the time of purchase	[2],[4]		true
Investment, maturity date	[2],[4]		Feb. 1, 2018
U.S. Treasury Bills 1.040% due 02/01/18 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[3]		1.04%
Discount rate at the time of purchase	[2],[3]		true
Investment, maturity date	[2],[3]		Feb. 1, 2018
U.S. Treasury Bills 1.040% due 02/01/18 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[5]		1.04%
Discount rate at the time of purchase	[2],[5]		true
Investment, maturity date	[2],[5]		Feb. 1, 2018
U.S. Treasury Bills 1.040% due 02/01/18 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[5]		1.04%
Discount rate at the time of purchase	[2],[5]		true
Investment, maturity date	[2],[5]		Feb. 1, 2018
U.S. Treasury Bills 1.040% due 02/01/18 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[3]		1.04%
Discount rate at the time of purchase	[2],[3]		true
Investment, maturity date	[2],[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]
Interest rate	[2],[6]		1.04%
Discount rate at the time of purchase	[2],[6]		true
Investment, maturity date	[2],[6]		Feb. 1, 2018
U.S. Treasury Bills 1.040% due 02/01/18 [Member] | ProShares Ultra Yen [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[3]		1.04%
Discount rate at the time of purchase	[2],[3]		true
Investment, maturity date	[2],[3]		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]
Interest rate	[2]		1.145%
Discount rate at the time of purchase	[2]		true
Investment, maturity date	[2]		Feb. 22, 2018
U.S. Treasury Bills 2.427% due 02/14/19 [Member] | ProShares Ultra Euro [Member]
Schedule of Investments [Line Items]
Interest rate	[1]	2.427%
Discount rate at the time of purchase	[1]	true
Investment, maturity date	[1]	Feb. 14, 2019
U.S. Treasury Bills 2.427% due 02/14/19 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate	[1],[4]	2.427%
Discount rate at the time of purchase	[1],[4]	true
Investment, maturity date	[1],[4]	Feb. 14, 2019
U.S. Treasury Bills 2.427% due 02/14/19 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Interest rate	[1]	2.427%
Discount rate at the time of purchase	[1]	true
Investment, maturity date	[1]	Feb. 14, 2019
U.S. Treasury Bills 2.307% due 01/17/19 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Interest rate	[1],[5]	2.307%
Discount rate at the time of purchase	[1],[5]	true
Investment, maturity date	[1],[5]	Jan. 17, 2019
U.S. Treasury Bills 2.307% due 01/17/19 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Interest rate	[1],[3]	2.307%
Discount rate at the time of purchase	[1],[3]	true
Investment, maturity date	[1],[3]	Jan. 17, 2019
U.S. Treasury Bills 1.898% due 01/31/19 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Interest rate	[1],[5]	1.898%
Discount rate at the time of purchase	[1],[5]	true
Investment, maturity date	[1],[5]	Jan. 31, 2019
U.S. Treasury Bills 1.898% due 01/31/19 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate	[1],[4]	1.898%
Discount rate at the time of purchase	[1],[4]	true
Investment, maturity date	[1],[4]	Jan. 31, 2019
U.S. Treasury Bills 1.898% due 01/31/19 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Interest rate	[1],[5]	1.898%
Discount rate at the time of purchase	[1],[5]	true
Investment, maturity date	[1],[5]	Jan. 31, 2019
U.S. Treasury Bills 2.349% due 02/14/19 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Interest rate	[1],[5]	2.349%
Discount rate at the time of purchase	[1],[5]	true
Investment, maturity date	[1],[5]	Feb. 14, 2019
U.S. Treasury Bills 1.075% due 02/08/18 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Interest rate			1.075%
Discount rate at the time of purchase			true
Investment, maturity date			Feb. 8, 2018
U.S. Treasury Bills 1.075% due 02/08/18 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[5]		1.075%
Discount rate at the time of purchase	[2],[5]		true
Investment, maturity date	[2],[5]		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]
Interest rate	[2],[4]		1.075%
Discount rate at the time of purchase	[2],[4]		true
Investment, maturity date	[2],[4]		Feb. 8, 2018
U.S. Treasury Bills 1.075% due 02/08/18 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[3]		1.075%
Discount rate at the time of purchase	[2],[3]		true
Investment, maturity date	[2],[3]		Feb. 8, 2018
U.S. Treasury Bills 1.075% due 02/08/18 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[5]		1.075%
Discount rate at the time of purchase	[2],[5]		true
Investment, maturity date	[2],[5]		Feb. 8, 2018
U.S. Treasury Bills 1.298% due 03/15/18 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Interest rate			1.298%
Discount rate at the time of purchase			true
Investment, maturity date			Mar. 15, 2018
U.S. Treasury Bills 2.285% due 01/17/19 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Interest rate	[1],[5]	2.285%
Discount rate at the time of purchase	[1],[5]	true
Investment, maturity date	[1],[5]	Jan. 17, 2019
U.S. Treasury Bills 2.241% due 01/31/19 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Interest rate	[1],[5]	2.241%
Discount rate at the time of purchase	[1],[5]	true
Investment, maturity date	[1],[5]	Jan. 31, 2019
U.S. Treasury Bills 2.364% due 02/14/19 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Interest rate	[1],[5]	2.364%
Discount rate at the time of purchase	[1],[5]	true
Investment, maturity date	[1],[5]	Feb. 14, 2019
United States Treasury Bills 1.126% due 02/01/18 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[5]		1.126%
Discount rate at the time of purchase	[2],[5]		true
Investment, maturity date	[2],[5]		Feb. 1, 2018
United States Treasury Bills 1.231% due 03/01/18 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[5]		1.231%
Discount rate at the time of purchase	[2],[5]		true
Investment, maturity date	[2],[5]		Mar. 1, 2018
U.S. Treasury Bills 1.292% due 04/05/18 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Interest rate	[2]		1.292%
Discount rate at the time of purchase	[2]		true
Investment, maturity date	[2]		Apr. 5, 2018
U.S. Treasury Bills 1.292% due 04/05/18 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[6]		1.292%
Discount rate at the time of purchase	[2],[6]		true
Investment, maturity date	[2],[6]		Apr. 5, 2018
U.S. Treasury Bills 2.342% due 01/17/19 [Member] | Proshares UltraPro 3x Crude Oil ETF [Member]
Schedule of Investments [Line Items]
Interest rate	[1]	2.342%
Discount rate at the time of purchase	[1]	true
Investment, maturity date	[1]	Jan. 17, 2019
U.S. Treasury Bills 2.212% due 01/17/19 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate	[1],[4]	2.212%
Discount rate at the time of purchase	[1],[4]	true
Investment, maturity date	[1],[4]	Jan. 17, 2019
U.S. Treasury Bills 1.068% due 01/25/18 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[4]		1.068%
Discount rate at the time of purchase	[2],[4]		true
Investment, maturity date	[2],[4]		Jan. 25, 2018
U.S. Treasury Bills 1.068% due 01/25/18 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[3]		1.068%
Discount rate at the time of purchase	[2],[3]		true
Investment, maturity date	[2],[3]		Jan. 25, 2018
U.S. Treasury Bills 1.068% due 01/25/18 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[3]		1.068%
Discount rate at the time of purchase	[2],[3]		true
Investment, maturity date	[2],[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]
Interest rate	[2],[4]		1.264%
Discount rate at the time of purchase	[2],[4]		true
Investment, maturity date	[2],[4]		Mar. 1, 2018
U.S. Treasury Bills 2.305% due 01/17/19 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Interest rate	[1],[3]	2.305%
Discount rate at the time of purchase	[1],[3]	true
Investment, maturity date	[1],[3]	Jan. 17, 2019
U.S. Treasury Bills 2.297% due 01/31/19 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Interest rate	[1],[3]	2.297%
Discount rate at the time of purchase	[1],[3]	true
Investment, maturity date	[1],[3]	Jan. 31, 2019
U.S. Treasury Bills 2.363% due 02/14/19 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Interest rate	[1],[3]	2.363%
Discount rate at the time of purchase	[1],[3]	true
Investment, maturity date	[1],[3]	Feb. 14, 2019
U.S. Treasury Bills 1.081% due 01/18/18 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[3]		1.081%
Discount rate at the time of purchase	[2],[3]		true
Investment, maturity date	[2],[3]		Jan. 18, 2018
U.S. Treasury Bills 1.885% due 01/31/19 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Interest rate	[1],[5]	1.885%
Discount rate at the time of purchase	[1],[5]	true
Investment, maturity date	[1],[5]	Jan. 31, 2019
U.S. Treasury Bills 2.349% due 02/14/19 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Interest rate	[1],[5]	2.349%
Discount rate at the time of purchase	[1],[5]	true
Investment, maturity date	[1],[5]	Feb. 14, 2019
U.S. Treasury Bills 2.349% due 02/14/19 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Interest rate	[1],[3]	2.349%
Discount rate at the time of purchase	[1],[3]	true
Investment, maturity date	[1],[3]	Feb. 14, 2019
U.S. Treasury Bills 1.856% due 01/17/19 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Interest rate	[1]	1.856%
Discount rate at the time of purchase	[1]	true
Investment, maturity date	[1]	Jan. 17, 2019
U.S. Treasury Bills 1.083% due 02/08/18 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[3]		1.083%
Discount rate at the time of purchase	[2],[3]		true
Investment, maturity date	[2],[3]		Feb. 8, 2018
U.S. Treasury Bills 1.264% due 03/01/18 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Interest rate	[2]		1.264%
Discount rate at the time of purchase	[2]		true
Investment, maturity date	[2]		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]
Interest rate	[2],[6]		1.264%
Discount rate at the time of purchase	[2],[6]		true
Investment, maturity date	[2],[6]		Mar. 1, 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]
Interest rate	[2],[6]		1.264%
Discount rate at the time of purchase	[2],[6]		true
Investment, maturity date	[2],[6]		Mar. 1, 2018
U.S. Treasury Bills 1.174% due 01/25/18 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	[2],[6]		1.174%
Discount rate at the time of purchase	[2],[6]		true
Investment, maturity date	[2],[6]		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]
Interest rate	[2],[6]		1.201%
Discount rate at the time of purchase	[2],[6]		true
Investment, maturity date	[2],[6]		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]
Interest rate	[2],[6]		1.075%
Discount rate at the time of purchase	[2],[6]		true
Investment, maturity date	[2],[6]		Feb. 8, 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]
Interest rate	[2],[6]		1.319%
Discount rate at the time of purchase	[2],[6]		true
Investment, maturity date	[2],[6]		Mar. 15, 2018
U.S. Treasury Bills 1.924% due 01/31/19 [Member] | ProShares UltraShort Australian Dollar [Member]
Schedule of Investments [Line Items]
Interest rate	[1]	1.924%
Discount rate at the time of purchase	[1]	true
Investment, maturity date	[1]	Jan. 31, 2019
U.S. Treasury Bills 2.314% due 01/17/19 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	[1],[6],[7]	2.314%
Discount rate at the time of purchase	[1],[6],[7]	true
Investment, maturity date	[1],[6],[7]	Jan. 17, 2019
U.S. Treasury Bills 2.326% due 01/31/19 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	[1],[6],[7]	2.326%
Discount rate at the time of purchase	[1],[6],[7]	true
Investment, maturity date	[1],[6],[7]	Jan. 31, 2019
U.S. Treasury Bills 2.389% due 02/28/19 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	[1]	2.389%
Discount rate at the time of purchase	[1]	true
Investment, maturity date	[1]	Feb. 28, 2019
[1]	Rates shown represent discount rate at the time of purchase.
[2]	Rates shown represents discount rate at the time of purchase.
[3]	All or partial amount pledged as collateral for foreign currency forward contracts.
[4]	All or partial amount pledged as collateral for swap agreements.
[5]	All or partial amount pledged as collateral for forward agreements.
[6]	All or partial amount pledged as collateral for futures contracts.
[7]	For forward agreements, a positive amount represents "long" exposure to the underlying commodity. A negative amount represents "short" exposure to the underlying commodity.

Schedule of Investments - Futur

Schedule of Investments - Futures Contracts Sold (Detail) - Futures Contracts [Member] - Contracts to Sell [Member]	Dec. 31, 2018USD ($)Contract	Dec. 31, 2017USD ($)Contract
ProShares Short Euro [Member] | Euro Fx Currency Futures - CME, expires March 2019 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract	60
Notional Amount at Value	$ 8,641,875
Unrealized Appreciation (Depreciation)	(43,281)
ProShares Short Euro [Member] | Euro Fx Currency Futures - CME, Expires March 2018 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract		53
Notional Amount at Value		$ 8,000,019
Unrealized Appreciation (Depreciation)		(166,288)
ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)	$ (14,476,201)	$ 17,041,449
ProShares Short VIX Short-Term Futures ETF [Member] | VIX Futures - CBOE, expires January 2019 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract	4,103
Notional Amount at Value	$ 99,190,025
Unrealized Appreciation (Depreciation)	$ (15,386,661)
ProShares Short VIX Short-Term Futures ETF [Member] | VIX Futures - CBOE, expires February 2019 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract	3,282
Notional Amount at Value	$ 73,106,550
Unrealized Appreciation (Depreciation)	$ 910,460
ProShares Short VIX Short-Term Futures ETF [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] | 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 UltraShort Australian Dollar [Member] | Australian Dollar Fx Currency Futures CME Expires March 2019 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract	315
Notional Amount at Value	$ 22,213,800
Unrealized Appreciation (Depreciation)	$ 511,825
ProShares UltraShort Australian Dollar [Member] | Australian Dollar Fx Currency Futures CME expires March 2018 [Member]
Schedule of Investments [Line Items]
Number of Contracts		353
Notional Amount at Value		$ 27,572,830
Unrealized Appreciation (Depreciation)		$ (893,220)
ProShares UltraShort Bloomberg Crude Oil [Member] | WTI Crude Oil - NYMEX, expires March 2019 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract	641
Notional Amount at Value	$ 29,306,520
Unrealized Appreciation (Depreciation)	$ 3,272,155
ProShares UltraShort Bloomberg Crude Oil [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 Gold [Member] | Gold Futures - COMEX, expires February 2019 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract	10
Notional Amount at Value	$ 1,281,300
Unrealized Appreciation (Depreciation)	$ (31,780)
ProShares UltraShort Gold [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)
ProShares UltraShort Silver [Member] | Silver Futures - COMEX, expires March 2019 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract	11
Notional Amount at Value	$ 854,700
Unrealized Appreciation (Depreciation)	$ (44,917)
ProShares UltraShort Silver [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 UltraPro 3X Short Crude Oil ETF [Member] | WTI Crude Oil - NYMEX, expires March 2019 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract	1,225
Notional Amount at Value	$ 56,007,000
Unrealized Appreciation (Depreciation)	$ 7,019,475
ProShares UltraPro 3X Short Crude Oil ETF [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 Bloomberg Natural Gas [Member] | Natural Gas-NYMEX, expires March 2019 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract	1,250
Notional Amount at Value	$ 35,637,500
Unrealized Appreciation (Depreciation)	$ 10,837,989
ProShares UltraShort Bloomberg Natural Gas [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)

Schedule of Investments - Fut_2

Schedule of Investments - Futures Contracts Purchased (Detail) - Futures Contracts [Member] - Contracts to Purchase [Member]	Dec. 31, 2018USD ($)Contract	Dec. 31, 2017USD ($)Contract
ProShares Ultra Gold [Member] | Gold Futures - COMEX, expires February 2019 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract	47
Notional Amount at Value	$ 6,022,110
Unrealized Appreciation (Depreciation)	72,670
ProShares Ultra Gold [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 VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)	$ 3,758,106	$ (2,215,280)
ProShares VIX Mid-Term Futures ETF [Member] | VIX Futures - CBOE, expires April 2019 [Member]
Schedule of Investments [Line Items]
Number of Contracts	503
Notional Amount at Value	$ 10,550,425
Unrealized Appreciation (Depreciation)	$ 1,677,781
ProShares VIX Mid-Term Futures ETF [Member] | VIX Futures - CBOE, expires May 2019 [Member]
Schedule of Investments [Line Items]
Number of Contracts	906
Notional Amount at Value	$ 18,799,500
Unrealized Appreciation (Depreciation)	$ 1,368,915
ProShares VIX Mid-Term Futures ETF [Member] | VIX Futures - CBOE, expires June 2019 [Member]
Schedule of Investments [Line Items]
Number of Contracts	906
Notional Amount at Value	$ 18,618,300
Unrealized Appreciation (Depreciation)	$ 841,460
ProShares VIX Mid-Term Futures ETF [Member] | VIX Futures - CBOE, expires July 2019 [Member]
Schedule of Investments [Line Items]
Number of Contracts	403
Notional Amount at Value	$ 8,332,025
Unrealized Appreciation (Depreciation)	(130,050)
ProShares VIX Mid-Term Futures ETF [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] | 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] | 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] | 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 Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)	$ 17,378,445	$ (4,761,877)
ProShares VIX Short-Term Futures ETF [Member] | VIX Futures - CBOE, expires January 2019 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract	3,561
Notional Amount at Value	$ 86,087,175
Unrealized Appreciation (Depreciation)	$ 18,392,959
ProShares VIX Short-Term Futures ETF [Member] | VIX Futures - CBOE, expires February 2019 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract	2,849
Notional Amount at Value	$ 63,461,475
Unrealized Appreciation (Depreciation)	$ (1,014,514)
ProShares VIX Short-Term Futures ETF [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] | 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
ProShares Ultra Bloomberg Crude Oil [Member] | WTI Crude Oil - NYMEX, expires March 2019 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract	3,121
Notional Amount at Value	$ 142,692,120
Unrealized Appreciation (Depreciation)	$ (14,040,301)
ProShares Ultra Bloomberg Crude Oil [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 Natural Gas [Member] | Natural Gas - NYMEX, expires March 2019 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract	1,025
Notional Amount at Value	$ 29,222,750
Unrealized Appreciation (Depreciation)	$ (10,323,163)
ProShares Ultra Bloomberg Natural Gas [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 Silver [Member] | Silver Futures - COMEX, expires March 2019 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract	129
Notional Amount at Value	$ 10,023,300
Unrealized Appreciation (Depreciation)	340,736
ProShares Ultra Silver [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 VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)	$ 32,503,965	$ (34,466,120)
ProShares Ultra VIX Short-Term Futures ETF [Member] | VIX Futures - CBOE, expires January 2019 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract	5,932
Notional Amount at Value	$ 143,406,100
Unrealized Appreciation (Depreciation)	$ 33,798,582
ProShares Ultra VIX Short-Term Futures ETF [Member] | VIX Futures - CBOE, expires February 2019 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract	4,746
Notional Amount at Value	$ 105,717,150
Unrealized Appreciation (Depreciation)	$ (1,294,617)
ProShares Ultra VIX Short-Term Futures ETF [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] | 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 UltraPro 3x Crude Oil ETF [Member] | WTI Crude Oil - NYMEX, expires March 2019 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract	5,751
Notional Amount at Value	$ 262,935,720
Unrealized Appreciation (Depreciation)	$ (23,451,361)
Proshares UltraPro 3x Crude Oil ETF [Member] | WTI Crude Oil - NYMEX, expires March 2018 [Member]
Schedule of Investments [Line Items]
Number of Contracts | Contract		563
Notional Amount at Value		$ 34,027,720
Unrealized Appreciation (Depreciation)		$ 1,417,998

Schedule of Investments - Total

Schedule of Investments - Total Return Swap Agreements (Detail) - Swap Agreements [Member] - USD ($)		12 Months Ended
		Dec. 31, 2018		Dec. 31, 2017
ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)/ Value		$ (72,767,125)	[1]	$ 62,238,361	[2]
ProShares Ultra Bloomberg Crude Oil [Member] | Citibank N.A. [Member] | Crude Oil Subindex [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[2],[3]			0.18%
Termination Date	[2]			Jan. 8, 2018
Notional Amount at Value	[2],[4]			$ 268,156,276
Unrealized Appreciation (Depreciation)/ Value	[2]			$ 19,815,892
ProShares Ultra Bloomberg Crude Oil [Member] | Citibank N.A. [Member] | WTI Crude Oil Subindex [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[1],[5]	0.18%
Termination Date	[1]	Jan. 7, 2019
Notional Amount at Value	[1],[4]	$ 192,061,821
Unrealized Appreciation (Depreciation)/ Value	[1]	$ (22,752,565)
ProShares Ultra Bloomberg Crude Oil [Member] | Goldman Sachs International [Member] | Crude Oil Subindex [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[2],[3]			0.25%
Termination Date	[2]			Jan. 8, 2018
Notional Amount at Value	[2],[4]			$ 213,961,079
Unrealized Appreciation (Depreciation)/ Value	[2]			$ 16,654,031
ProShares Ultra Bloomberg Crude Oil [Member] | Goldman Sachs International [Member] | WTI Crude Oil Subindex [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[1],[5]	0.25%
Termination Date	[1]	Jan. 7, 2019
Notional Amount at Value	[1],[4]	$ 112,179,333
Unrealized Appreciation (Depreciation)/ Value	[1]	$ (15,691,687)
ProShares Ultra Bloomberg Crude Oil [Member] | Societe Generale S.A. [Member] | Crude Oil Subindex [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[2],[3]			0.25%
Termination Date	[2]			Jan. 8, 2018
Notional Amount at Value	[2],[4]			$ 122,285,969
Unrealized Appreciation (Depreciation)/ Value	[2]			$ 9,003,519
ProShares Ultra Bloomberg Crude Oil [Member] | Societe Generale S.A. [Member] | WTI Crude Oil Subindex [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[1],[5]	0.25%
Termination Date	[1]	Jan. 7, 2019
Notional Amount at Value	[1],[4]	$ 38,382,074
Unrealized Appreciation (Depreciation)/ Value	[1]	$ (5,206,589)
ProShares Ultra Bloomberg Crude Oil [Member] | UBS AG [Member] | Crude Oil Subindex [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[2],[3]			0.25%
Termination Date	[2]			Jan. 8, 2018
Notional Amount at Value	[2],[4]			$ 211,563,368
Unrealized Appreciation (Depreciation)/ Value	[2]			16,764,919
ProShares Ultra Bloomberg Crude Oil [Member] | UBS AG [Member] | WTI Crude Oil Subindex [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[1],[5]	0.25%
Termination Date	[1]	Jan. 7, 2019
Notional Amount at Value	[1],[4]	$ 137,242,162
Unrealized Appreciation (Depreciation)/ Value	[1]	$ (15,279,898)
ProShares Ultra Bloomberg Crude Oil [Member] | Royal Bank of Canada [Member] | WTI Crude Oil Subindex [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[1],[5]	0.23%
Termination Date	[1]	Jan. 7, 2019
Notional Amount at Value	[1],[4]	$ 113,997,533
Unrealized Appreciation (Depreciation)/ Value	[1]	(13,836,386)
ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)/ Value		$ 20,646,726	[1]	$ (30,607,142)	[2]
ProShares UltraShort Bloomberg Crude Oil [Member] | Citibank N.A. [Member] | Crude Oil Subindex [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[2],[3]			0.18%
Termination Date	[2]			Jan. 8, 2018
Notional Amount at Value	[2],[4]			$ (135,972,863)
Unrealized Appreciation (Depreciation)/ Value	[2]			$ (10,173,164)
ProShares UltraShort Bloomberg Crude Oil [Member] | Citibank N.A. [Member] | WTI Crude Oil Subindex [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[1],[5]	0.18%
Termination Date	[1]	Jan. 7, 2019
Notional Amount at Value	[1],[4]	$ (67,986,223)
Unrealized Appreciation (Depreciation)/ Value	[1]	$ 8,336,367
ProShares UltraShort Bloomberg Crude Oil [Member] | Goldman Sachs International [Member] | Crude Oil Subindex [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[2],[3]			0.25%
Termination Date	[2]			Jan. 8, 2018
Notional Amount at Value	[2],[4]			$ (105,656,763)
Unrealized Appreciation (Depreciation)/ Value	[2]			$ (9,242,398)
ProShares UltraShort Bloomberg Crude Oil [Member] | Goldman Sachs International [Member] | WTI Crude Oil Subindex [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[1],[5]	0.25%
Termination Date	[1]	Jan. 7, 2019
Notional Amount at Value	[1],[4]	$ (43,744,157)
Unrealized Appreciation (Depreciation)/ Value	[1]	$ 2,752,372
ProShares UltraShort Bloomberg Crude Oil [Member] | Societe Generale S.A. [Member] | Crude Oil Subindex [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[2],[3]			0.25%
Termination Date	[2]			Jan. 8, 2018
Notional Amount at Value	[2],[4]			$ (25,759,601)
Unrealized Appreciation (Depreciation)/ Value	[2]			$ (1,904,113)
ProShares UltraShort Bloomberg Crude Oil [Member] | Societe Generale S.A. [Member] | WTI Crude Oil Subindex [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[1],[5]	0.25%
Termination Date	[1]	Jan. 7, 2019
Notional Amount at Value	[1],[4]	$ (13,980,566)
Unrealized Appreciation (Depreciation)/ Value	[1]	$ 1,891,050
ProShares UltraShort Bloomberg Crude Oil [Member] | UBS AG [Member] | Crude Oil Subindex [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[2],[3]			0.25%
Termination Date	[2]			Jan. 8, 2018
Notional Amount at Value	[2],[4]			$ (116,263,837)
Unrealized Appreciation (Depreciation)/ Value	[2]			$ (9,287,467)
ProShares UltraShort Bloomberg Crude Oil [Member] | UBS AG [Member] | WTI Crude Oil Subindex [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[1],[5]	0.25%
Termination Date	[1]	Jan. 7, 2019
Notional Amount at Value	[1],[4]	$ (42,493,832)
Unrealized Appreciation (Depreciation)/ Value	[1]	$ 3,428,977
ProShares UltraShort Bloomberg Crude Oil [Member] | Royal Bank of Canada [Member] | WTI Crude Oil Subindex [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[1],[5]	0.23%
Termination Date	[1]	Jan. 7, 2019
Notional Amount at Value	[1],[4]	$ (31,327,722)
Unrealized Appreciation (Depreciation)/ Value	[1]	4,237,960
ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)/ Value	[1]	$ (1,330,949)
ProShares Ultra VIX Short-Term Futures ETF [Member] | Goldman Sachs International [Member] | International Based On iPath S And P 500 VIX Short-Term Futures ETN IOPV [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	[1],[5]	2.51%
Termination Date	[1]	Jan. 26, 2019
Notional Amount at Value	[1],[4]	$ 72,301,516
Unrealized Appreciation (Depreciation)/ Value	[1]	$ (1,330,949)
[1]	The positions and counterparties herein are as of December 31, 2018. The Fund continually evaluates 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, 2017. 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, 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.
[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, 2018, 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.

Schedule of Investments - Forei

Schedule of Investments - Foreign Currency Forward Contracts (Detail) - Foreign Currency Forward Contracts [Member]

12 Months Ended

Dec. 31, 2018USD ($)

[1]

Dec. 31, 2017USD ($)

Dec. 31, 2018EUR (€)

[1]

Dec. 31, 2018JPY (¥)

[1]

Dec. 31, 2017EUR (€)

[2]

Dec. 31, 2017JPY (¥)

ProShares Ultra Euro [Member] | Euro Contract [Member] | Contracts to Purchase [Member]

Schedule of Investments [Line Items]

Unrealized Appreciation (Depreciation)/Value

$ 61,971

$ 321,609

[2]

ProShares Ultra Euro [Member] | Euro Contract [Member] | Contracts to Purchase [Member] | Goldman Sachs International [Member]

Schedule of Investments [Line Items]

Settlement Date

Jan. 11, 2019

Jan. 12, 2018

[2]

Contract Amount/ Notional Amount

$ 8,079,203

$ 10,550,545

[2]

€ 7,046,525

€ 8,921,525

Unrealized Appreciation (Depreciation)/Value

$ 28,315

$ 159,093

[2]

ProShares Ultra Euro [Member] | Euro Contract [Member] | Contracts to Purchase [Member] | UBS AG [Member]

Schedule of Investments [Line Items]

Settlement Date

Jan. 11, 2019

Jan. 12, 2018

[2]

Contract Amount/ Notional Amount

$ 7,461,414

$ 12,050,988

[2]

6,507,700

10,174,300

Unrealized Appreciation (Depreciation)/Value

33,656

162,516

[2]

ProShares Ultra Euro [Member] | Euro Contract [Member] | Contracts to Sell [Member]

Schedule of Investments [Line Items]

Unrealized Appreciation (Depreciation)/Value

$ (4,033)

$ (57,457)

[2]

ProShares Ultra Euro [Member] | Euro Contract [Member] | Contracts to Sell [Member] | Goldman Sachs International [Member]

Schedule of Investments [Line Items]

Settlement Date

Jan. 11, 2019

Jan. 12, 2018

[2]

Contract Amount/ Notional Amount

$ (236,533)

$ (3,630,563)

[2]

(206,300)

(3,071,600)

Unrealized Appreciation (Depreciation)/Value

$ (2,106)

$ (56,669)

[2]

ProShares Ultra Euro [Member] | Euro Contract [Member] | Contracts to Sell [Member] | UBS AG [Member]

Schedule of Investments [Line Items]

Settlement Date

Jan. 11, 2019

Jan. 12, 2018

[2]

Contract Amount/ Notional Amount

$ (232,979)

$ (44,709)

[2]

(203,200)

(37,900)

Unrealized Appreciation (Depreciation)/Value

(1,927)

(788)

[2]

ProShares UltraShort Yen [Member] | Yen Contract [Member] | Contracts to Purchase [Member]

Schedule of Investments [Line Items]

Unrealized Appreciation (Depreciation)/Value

$ 678,152

$ (41,734)

[2]

ProShares UltraShort Yen [Member] | Yen Contract [Member] | Contracts to Purchase [Member] | Goldman Sachs International [Member]

Schedule of Investments [Line Items]

Settlement Date

Jan. 11, 2019

Jan. 12, 2018

[2]

Contract Amount/ Notional Amount

$ 13,322,009

$ 13,828,233

[2]

¥ 1,459,634,700

¥ 1,557,430,400

[2]

Unrealized Appreciation (Depreciation)/Value

$ 330,465

$ (1,119)

[2]

ProShares UltraShort Yen [Member] | Yen Contract [Member] | Contracts to Purchase [Member] | UBS AG [Member]

Schedule of Investments [Line Items]

Settlement Date

Jan. 11, 2019

Jan. 12, 2018

[2]

Contract Amount/ Notional Amount

$ 22,328,658

$ 24,716,567

[2]

2,446,453,800

2,779,401,900

[2]

Unrealized Appreciation (Depreciation)/Value

347,687

(40,615)

[2]

ProShares UltraShort Yen [Member] | Yen Contract [Member] | Contracts to Sell [Member]

Schedule of Investments [Line Items]

Unrealized Appreciation (Depreciation)/Value

$ (3,801,896)

$ 1,568,997

[2]

ProShares UltraShort Yen [Member] | Yen Contract [Member] | Contracts to Sell [Member] | Goldman Sachs International [Member]

Schedule of Investments [Line Items]

Settlement Date

Jan. 11, 2019

Jan. 12, 2018

[2]

Contract Amount/ Notional Amount

$ (68,367,332)

$ (145,748,706)

[2]

(7,490,711,300)

(16,323,923,000)

[2]

Unrealized Appreciation (Depreciation)/Value

$ (1,755,536)

$ 822,436

[2]

ProShares UltraShort Yen [Member] | Yen Contract [Member] | Contracts to Sell [Member] | UBS AG [Member]

Schedule of Investments [Line Items]

Settlement Date

Jan. 11, 2019

Jan. 12, 2018

[2]

Contract Amount/ Notional Amount

$ (78,017,066)

$ (156,520,911)

[2]

(8,547,990,500)

(17,545,808,000)

[2]

Unrealized Appreciation (Depreciation)/Value

(2,046,360)

746,561

[2]

ProShares Ultra Yen [Member] | Yen Contract [Member]

Schedule of Investments [Line Items]

Unrealized Appreciation (Depreciation)/Value

[2]

(34,824)

ProShares Ultra Yen [Member] | Yen Contract [Member] | Contracts to Purchase [Member]

Schedule of Investments [Line Items]

Unrealized Appreciation (Depreciation)/Value

$ 179,187

$ (34,514)

[2]

ProShares Ultra Yen [Member] | Yen Contract [Member] | Contracts to Purchase [Member] | Goldman Sachs International [Member]

Schedule of Investments [Line Items]

Settlement Date

Jan. 11, 2019

Jan. 12, 2018

[2]

Contract Amount/ Notional Amount

$ 2,873,778

$ 2,907,183

[2]

314,867,300

325,511,500

[2]

Unrealized Appreciation (Depreciation)/Value

$ 73,705

$ (17,243)

[2]

ProShares Ultra Yen [Member] | Yen Contract [Member] | Contracts to Purchase [Member] | UBS AG [Member]

Schedule of Investments [Line Items]

Settlement Date

Jan. 11, 2019

Jan. 12, 2018

[2]

Contract Amount/ Notional Amount

$ 8,721,224

$ 2,961,858

[2]

955,546,600

331,666,700

[2]

Unrealized Appreciation (Depreciation)/Value

105,482

(17,271)

[2]

ProShares Ultra Yen [Member] | Yen Contract [Member] | Contracts to Sell [Member]

Schedule of Investments [Line Items]

Unrealized Appreciation (Depreciation)/Value

$ (2,076)

$ (310)

[2]

ProShares Ultra Yen [Member] | Yen Contract [Member] | Contracts to Sell [Member] | Goldman Sachs International [Member]

Schedule of Investments [Line Items]

Settlement Date

[2]

Jan. 12, 2018

Contract Amount/ Notional Amount

[2]

$ (75,872)

(8,564,800)

Unrealized Appreciation (Depreciation)/Value

[2]

$ (167)

ProShares Ultra Yen [Member] | Yen Contract [Member] | Contracts to Sell [Member] | UBS AG [Member]

Schedule of Investments [Line Items]

Settlement Date

Jan. 11, 2019

Jan. 12, 2018

[2]

Contract Amount/ Notional Amount

$ (91,773)

$ (29,476)

[2]

¥ (10,055,200)

¥ (3,336,100)

[2]

Unrealized Appreciation (Depreciation)/Value

(2,076)

(143)

[2]

ProShares UltraShort Euro [Member] | Euro Contract [Member] | Contracts to Purchase [Member]

Schedule of Investments [Line Items]

Unrealized Appreciation (Depreciation)/Value

$ 104,074

$ 449,302

[2]

ProShares UltraShort Euro [Member] | Euro Contract [Member] | Contracts to Purchase [Member] | Goldman Sachs International [Member]

Schedule of Investments [Line Items]

Settlement Date

Jan. 11, 2019

Jan. 12, 2018

[2]

Contract Amount/ Notional Amount

$ 13,182,017

$ 18,303,048

[2]

11,497,100

15,379,400

Unrealized Appreciation (Depreciation)/Value

$ 54,842

$ 158,796

[2]

ProShares UltraShort Euro [Member] | Euro Contract [Member] | Contracts to Purchase [Member] | UBS AG [Member]

Schedule of Investments [Line Items]

Settlement Date

Jan. 11, 2019

Jan. 12, 2018

[2]

Contract Amount/ Notional Amount

$ 37,917,719

$ 29,485,603

[2]

33,071,100

24,804,600

Unrealized Appreciation (Depreciation)/Value

49,232

290,506

[2]

ProShares UltraShort Euro [Member] | Euro Contract [Member] | Contracts to Sell [Member]

Schedule of Investments [Line Items]

Unrealized Appreciation (Depreciation)/Value

$ (1,599,878)

$ (6,793,571)

[2]

ProShares UltraShort Euro [Member] | Euro Contract [Member] | Contracts to Sell [Member] | Goldman Sachs International [Member]

Schedule of Investments [Line Items]

Settlement Date

Jan. 11, 2019

Jan. 12, 2018

[2]

Contract Amount/ Notional Amount

$ (174,422,043)

$ (226,812,145)

[2]

(152,127,525)

(191,822,225)

Unrealized Appreciation (Depreciation)/Value

$ (664,844)

$ (3,456,408)

[2]

ProShares UltraShort Euro [Member] | Euro Contract [Member] | Contracts to Sell [Member] | UBS AG [Member]

Schedule of Investments [Line Items]

Settlement Date

Jan. 11, 2019

Jan. 12, 2018

[2]

Contract Amount/ Notional Amount

$ (184,657,508)

$ (219,354,746)

[2]

€ (161,054,700)

€ (185,510,600)

Unrealized Appreciation (Depreciation)/Value

$ (935,034)

$ (3,337,163)

[2]

[1]

The positions and counterparties herein are as of December 31, 2018. The Fund continually evaluates 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, 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 - Forwa

Schedule of Investments - Forward Agreements (Detail) - Forward Agreements [Member] - USD ($)		12 Months Ended
		Dec. 31, 2018	[1]	Dec. 31, 2017	[2]
ProShares Ultra Gold [Member] | Basis Zero Point Nine Nine Five Fine Troy Ounce Gold [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)/Value		$ 4,253,301		$ 3,646,355
ProShares Ultra Gold [Member] | Citibank N.A. [Member] | Basis Zero Point Nine Nine Five Fine Troy Ounce Gold [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)		2.85%	[3]	2.25%	[4]
Settlement Date		Jan. 7, 2019		Jan. 8, 2018
Commitment to (Deliver)/Receive		$ 50,300		$ 53,800
Notional Amount at Value	[5]	64,366,395		69,494,536
Unrealized Appreciation (Depreciation)/Value		$ 1,682,026		$ 1,513,310
ProShares Ultra Gold [Member] | Goldman Sachs International [Member] | Basis Zero Point Nine Nine Five Fine Troy Ounce Gold [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)		3.30%	[3]	2.30%	[4]
Settlement Date		Jan. 7, 2019		Jan. 8, 2018
Commitment to (Deliver)/Receive		$ 36,620		$ 38,420
Notional Amount at Value	[5]	46,862,980		49,625,577
Unrealized Appreciation (Depreciation)/Value		$ 1,223,528		$ 969,501
ProShares Ultra Gold [Member] | Societe Generale S.A. [Member] | Basis Zero Point Nine Nine Five Fine Troy Ounce Gold [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)		3.02%	[3]	2.18%	[4]
Settlement Date		Jan. 7, 2019		Jan. 8, 2018
Commitment to (Deliver)/Receive		$ 1,000		$ 13,000
Notional Amount at Value	[5]	1,279,640		16,791,060
Unrealized Appreciation (Depreciation)/Value		$ 61,260		$ 218,319
ProShares Ultra Gold [Member] | UBS AG [Member] | Basis Zero Point Nine Nine Five Fine Troy Ounce Gold [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)		2.90%	[3]	2.36%	[4]
Settlement Date		Jan. 7, 2019		Jan. 8, 2018
Commitment to (Deliver)/Receive		$ 37,900		$ 39,700
Notional Amount at Value	[5]	48,497,598		51,280,490
Unrealized Appreciation (Depreciation)/Value		1,286,487		945,225
ProShares Ultra Silver [Member] | Basis Zero Point Nine Nine Nine Fine Troy Ounce Silver [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)/Value		$ 26,301,717		$ 21,735,334
ProShares Ultra Silver [Member] | Citibank N.A. [Member] | Basis Zero Point Nine Nine Nine Fine Troy Ounce Silver [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)		3.05%	[3]	2.35%	[6]
Settlement Date		Jan. 7, 2019		Jan. 8, 2018
Commitment to (Deliver)/Receive		$ 9,480,000		$ 10,403,000
Notional Amount at Value	[5]	146,687,832		175,548,544
Unrealized Appreciation (Depreciation)/Value		$ 9,662,061		$ 7,201,744
ProShares Ultra Silver [Member] | Goldman Sachs International [Member] | Basis Zero Point Nine Nine Nine Fine Troy Ounce Silver [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)		3.65%	[3]	2.37%	[6]
Settlement Date		Jan. 7, 2019		Jan. 8, 2018
Commitment to (Deliver)/Receive		$ 8,070,800		$ 8,119,800
Notional Amount at Value	[5]	124,892,402		137,013,505
Unrealized Appreciation (Depreciation)/Value		$ 8,418,745		$ 5,873,080
ProShares Ultra Silver [Member] | Societe Generale S.A. [Member] | Basis Zero Point Nine Nine Nine Fine Troy Ounce Silver [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)		3.17%	[3]	2.35%	[6]
Settlement Date		Jan. 7, 2019		Jan. 8, 2018
Commitment to (Deliver)/Receive		$ 100,000		$ 3,784,000
Notional Amount at Value	[5]	1,547,320		63,850,838
Unrealized Appreciation (Depreciation)/Value		$ 118,797		$ 2,761,817
ProShares Ultra Silver [Member] | UBS AG [Member] | Basis Zero Point Nine Nine Nine Fine Troy Ounce Silver [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)		3.68%	[3]	2.50%	[6]
Settlement Date		Jan. 7, 2019		Jan. 8, 2018
Commitment to (Deliver)/Receive		$ 7,786,000		$ 8,293,000
Notional Amount at Value	[5]	120,486,014		139,941,058
Unrealized Appreciation (Depreciation)/Value		8,102,114		5,898,693
ProShares UltraShort Silver [Member] | Basis Zero Point Nine Nine Nine Fine Troy Ounce Silver [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)/Value		$ (1,793,011)		$ (1,716,163)
ProShares UltraShort Silver [Member] | Citibank N.A. [Member] | Basis Zero Point Nine Nine Nine Fine Troy Ounce Silver [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)		(2.55%)	[3]	(1.85%)	[6]
Settlement Date		Jan. 7, 2019		Jan. 8, 2018
Commitment to (Deliver)/Receive		$ (399,000)		$ (529,000)
Notional Amount at Value	[5]	(6,173,887)		(8,926,769)
Unrealized Appreciation (Depreciation)/Value		$ (566,050)		$ (632,593)
ProShares UltraShort Silver [Member] | Goldman Sachs International [Member] | Basis Zero Point Nine Nine Nine Fine Troy Ounce Silver [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)		(2.80%)	[3]	(1.52%)	[6]
Settlement Date		Jan. 7, 2019		Jan. 8, 2018
Commitment to (Deliver)/Receive		$ (559,500)		$ (418,500)
Notional Amount at Value	[5]	(8,658,038)		(7,061,769)
Unrealized Appreciation (Depreciation)/Value		$ (605,756)		$ (486,240)
ProShares UltraShort Silver [Member] | Societe Generale S.A. [Member] | Basis Zero Point Nine Nine Nine Fine Troy Ounce Silver [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)		(2.27%)	[3]	(1.45%)	[6]
Settlement Date		Jan. 7, 2019		Jan. 8, 2018
Commitment to (Deliver)/Receive		$ (100,000)		$ (156,000)
Notional Amount at Value	[5]	(1,547,320)		(2,632,328)
Unrealized Appreciation (Depreciation)/Value		$ (119,953)		$ (115,305)
ProShares UltraShort Silver [Member] | UBS AG [Member] | Basis Zero Point Nine Nine Nine Fine Troy Ounce Silver [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)		(2.78%)	[3]	(1.60%)	[6]
Settlement Date		Jan. 7, 2019		Jan. 8, 2018
Commitment to (Deliver)/Receive		$ (407,000)		$ (642,000)
Notional Amount at Value	[5]	(6,298,203)		(10,833,493)
Unrealized Appreciation (Depreciation)/Value		(501,252)		(482,025)
ProShares UltraShort Gold [Member] | Basis Zero Point Nine Nine Five Fine Troy Ounce Gold [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)/Value		$ (990,786)		$ (1,488,259)
ProShares UltraShort Gold [Member] | Citibank N.A. [Member] | Basis Zero Point Nine Nine Five Fine Troy Ounce Gold [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)		(2.35%)	[3]	(1.75%)	[4]
Settlement Date		Jan. 7, 2019		Jan. 8, 2018
Commitment to (Deliver)/Receive		$ (11,200)		$ (18,900)
Notional Amount at Value	[5]	(14,332,080)		(24,413,508)
Unrealized Appreciation (Depreciation)/Value		$ (380,655)		$ (554,559)
ProShares UltraShort Gold [Member] | Goldman Sachs International [Member] | Basis Zero Point Nine Nine Five Fine Troy Ounce Gold [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)		(2.45%)	[3]	(1.45%)	[4]
Settlement Date		Jan. 7, 2019		Jan. 8, 2018
Commitment to (Deliver)/Receive		$ (7,598)		$ (12,798)
Notional Amount at Value	[5]	(9,723,237)		(16,530,665)
Unrealized Appreciation (Depreciation)/Value		$ (258,134)		$ (428,358)
ProShares UltraShort Gold [Member] | Societe Generale S.A. [Member] | Basis Zero Point Nine Nine Five Fine Troy Ounce Gold [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)		(2.12%)	[3]	(1.28%)	[4]
Settlement Date		Jan. 7, 2019		Jan. 8, 2018
Commitment to (Deliver)/Receive		$ (1,000)		$ (4,800)
Notional Amount at Value	[5]	(1,279,640)		(6,199,776)
Unrealized Appreciation (Depreciation)/Value		$ (63,076)		$ (126,928)
ProShares UltraShort Gold [Member] | UBS AG [Member] | Basis Zero Point Nine Nine Five Fine Troy Ounce Gold [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)		(2.10%)	[3]	(1.56%)	[4]
Settlement Date		Jan. 7, 2019		Jan. 8, 2018
Commitment to (Deliver)/Receive		$ (7,450)		$ (12,050)
Notional Amount at Value	[5]	(9,533,169)		(15,564,985)
Unrealized Appreciation (Depreciation)/Value		$ (288,921)		$ (378,414)
[1]	The positions and counterparties herein are as of December 31, 2018. The Fund continually evaluates 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, 2017. 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, 2018, 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.
[4]	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.
[5]	For forward agreements, a positive amount represents "long" exposure to the underlying commodity. A negative amount represents "short" exposure to the underlying commodity.
[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.

Schedule of Investments - For_2

Schedule of Investments - Forward Agreements (Parenthetical) (Detail) - Forward Agreements [Member] - ozt	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Basis Zero Point Nine Nine Five Fine Troy Ounce Gold [Member] | Gold [Member]
Schedule of Investments [Line Items]
Derivative, nonmonetary notional amount, mass	0.995	0.995
Basis Zero Point Nine Nine Nine Fine Troy Ounce Silver [Member] | Silver [Member]
Schedule of Investments [Line Items]
Derivative, nonmonetary notional amount, mass	0.999	0.999

Organization - Additional Infor

Organization - Additional Information (Detail)	Nov. 24, 2018USD ($)shares	Dec. 31, 2018Trust
Subsidiary, Sale of Stock [Line Items]
Number of series of Trust | Trust		20
Period for expected multiple returns		1 day
ProShares UltraShort Bloomberg Crude Oil [Member] | Private Placement [Member]
Subsidiary, Sale of Stock [Line Items]
Share issued, shares | shares	14
Shares issued, value | $	$ 350
ProShares UltraShort Gold [Member] | Private Placement [Member]
Subsidiary, Sale of Stock [Line Items]
Share issued, shares | shares	14
Shares issued, value | $	$ 350
ProShares UltraShort Silver [Member] | Private Placement [Member]
Subsidiary, Sale of Stock [Line Items]
Share issued, shares | shares	14
Shares issued, value | $	$ 350
ProShares UltraShort Euro [Member] | Private Placement [Member]
Subsidiary, Sale of Stock [Line Items]
Share issued, shares | shares	14
Shares issued, value | $	$ 350
ProShares UltraShort Yen [Member] | Private Placement [Member]
Subsidiary, Sale of Stock [Line Items]
Share issued, shares | shares	14
Shares issued, value | $	$ 350
ProShares Ultra Bloomberg Crude Oil [Member] | Private Placement [Member]
Subsidiary, Sale of Stock [Line Items]
Share issued, shares | shares	14
Shares issued, value | $	$ 350
ProShares Ultra Gold [Member] | Private Placement [Member]
Subsidiary, Sale of Stock [Line Items]
Share issued, shares | shares	14
Shares issued, value | $	$ 350
ProShares Ultra Silver [Member] | Private Placement [Member]
Subsidiary, Sale of Stock [Line Items]
Share issued, shares | shares	14
Shares issued, value | $	$ 350
ProShares Ultra Euro [Member] | Private Placement [Member]
Subsidiary, Sale of Stock [Line Items]
Share issued, shares | shares	14
Shares issued, value | $	$ 350
ProShares Ultra Yen [Member] | Private Placement [Member]
Subsidiary, Sale of Stock [Line Items]
Share issued, shares | shares	14
Shares issued, value | $	$ 350

Organization - Schedule of Shar

Organization - Schedule of Share Splits and Reverse Share Splits (Detail)	12 Months Ended
	Dec. 31, 2018
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
Type of Split	3-for-1 Share split
Date Trading Resumed at Post- Split Price	Jul. 25, 2016
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
Type of Split	1-for-5 reverse Share split
Date Trading Resumed at Post- Split Price	Jul. 25, 2016
ProShares VIX Short-Term Futures ETF [Member] | July 14, 2017 Reverse Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	Jul. 14, 2017
Type of Split	1-for-4 reverse Share split
Date Trading Resumed at Post- Split Price	Jul. 17, 2017
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
Type of Split	1-for-5 reverse Share split
Date Trading Resumed at Post- Split Price	Jul. 25, 2016
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
Type of Split	1-for-5 reverse Share split
Date Trading Resumed at Post- Split Price	Jan. 12, 2017
ProShares Ultra VIX Short-Term Futures ETF [Member] | July 14, 2017 Reverse Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	Jul. 14, 2017
Type of Split	1-for-4 reverse Share split
Date Trading Resumed at Post- Split Price	Jul. 17, 2017
ProShares Ultra VIX Short-Term Futures ETF [Member] | September 17, 2018 Reverse Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	Sep. 17, 2018
Type of Split	1-for-5 reverse Share split
Date Trading Resumed at Post- Split Price	Sep. 18, 2018
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
Type of Split	2-for-1 Share split
Date Trading Resumed at Post- Split Price	Jan. 12, 2017
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
Type of Split	1-for-2 reverse Share split
Date Trading Resumed at Post- Split Price	Jan. 12, 2017
ProShares Short VIX Short-Term Futures ETF [Member] | July 12, 2017 Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	Jul. 12, 2017
Type of Split	2-for-1 Share split
Date Trading Resumed at Post- Split Price	Jul. 17, 2017
ProShares Short VIX Short-Term Futures ETF [Member] | September 17, 2018 Reverse Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	Sep. 17, 2018
Type of Split	1-for-4 reverse Share split
Date Trading Resumed at Post- Split Price	Sep. 18, 2018
ProShares Ultra Bloomberg Natural Gas [Member] | March 19, 2018 Reserve Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	Mar. 19, 2018
Type of Split	1-for-5 reverse Share split
Date Trading Resumed at Post- Split Price	Mar. 20, 2018
ProShares Ultra Pro 3x Short Crude Oil ETF [Member] | March 19, 2018 Reserve Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	Mar. 19, 2018
Type of Split	1-for-4 reverse Share split
Date Trading Resumed at Post- Split Price	Mar. 20, 2018

Significant Accounting Polici_4

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, 2018
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 31, 2018
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 31, 2018
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 31, 2018
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 31, 2018
ProShares UltraShort 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 31, 2018
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 31, 2018
ProShares 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 31, 2018
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 31, 2018
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 31, 2018
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 31, 2018
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 31, 2018
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 31, 2018
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 31, 2018
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 31, 2018
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 31, 2018
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 31, 2018
ProShares 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 31, 2018
ProShares Short 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 31, 2018
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 31, 2018
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 31, 2018

Significant Accounting Polici_5

Significant Accounting Policies - Valuation of Investments using Fair Value Hierarchy (Detail) - USD ($)		Dec. 31, 2018	Dec. 31, 2017
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		$ 768,305,596	$ 2,482,081,250
ProShares Short Euro [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		556,148	6,829,947
ProShares Short VIX Short-Term Futures ETF [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		(14,476,201)	511,952,093
ProShares Ultra Bloomberg Crude Oil [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		193,695,474	533,700,242
ProShares Ultra Bloomberg Natural Gas [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		(1,942,736)	58,187,166
ProShares Ultra Euro [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		1,554,596	7,260,387
ProShares Ultra Gold [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		46,267,705	92,536,679
ProShares Ultra Silver [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		150,438,259	257,318,650
ProShares Ultra VIX Short-Term Futures ETF [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		31,173,016	253,067,012
ProShares Ultra Yen [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		177,111	1,963,109
Proshares UltraPro 3x Crude Oil ETF [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		(2,471,485)	1,417,998
ProShares UltraPro 3X Short Crude Oil ETF [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		7,019,475	(2,988,155)
ProShares UltraShort Australian Dollar [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		811,362	11,090,684
ProShares UltraShort Bloomberg Crude Oil [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		51,886,415	219,077,033
ProShares UltraShort Bloomberg Natural Gas [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		11,137,703	2,902,702
ProShares UltraShort Euro [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		120,305,881	198,425,897
ProShares UltraShort Gold [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		2,966,997	30,484,181
ProShares UltraShort Silver [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		1,456,838	16,632,048
ProShares UltraShort Yen [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		31,827,485	133,361,615
ProShares VIX Mid-Term Futures ETF [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		3,758,106	18,778,235
ProShares VIX Short-Term Futures ETF [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		132,163,447	130,083,727
Level I - Quoted Prices [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		785,085,860	2,445,779,873
Level I - Quoted Prices [Member] | Futures Contracts [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure	[1]	13,284,362	(12,919,431)
Level I - Quoted Prices [Member] | ProShares Short Euro [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		599,429	6,996,235
Level I - Quoted Prices [Member] | ProShares Short Euro [Member] | Futures Contracts [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure	[1]	(43,281)	(166,288)
Level I - Quoted Prices [Member] | ProShares Short VIX Short-Term Futures ETF [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure			494,910,644
Level I - Quoted Prices [Member] | ProShares Short VIX Short-Term Futures ETF [Member] | Futures Contracts [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure	[1]	(14,476,201)	17,041,449
Level I - Quoted Prices [Member] | ProShares Ultra Bloomberg Crude Oil [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		280,502,900	459,515,902
Level I - Quoted Prices [Member] | ProShares Ultra Bloomberg Crude Oil [Member] | Futures Contracts [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure	[1]	(14,040,301)	11,945,979
Level I - Quoted Prices [Member] | ProShares Ultra Bloomberg Natural Gas [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		8,380,427	50,961,356
Level I - Quoted Prices [Member] | ProShares Ultra Bloomberg Natural Gas [Member] | Futures Contracts [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure	[1]	(10,323,163)	7,225,810
Level I - Quoted Prices [Member] | ProShares Ultra Euro [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		1,496,658	6,996,235
Level I - Quoted Prices [Member] | ProShares Ultra Gold [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		41,941,734	88,884,844
Level I - Quoted Prices [Member] | ProShares Ultra Gold [Member] | Futures Contracts [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure	[1]	72,670	5,480
Level I - Quoted Prices [Member] | ProShares Ultra Silver [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		123,795,806	235,581,716
Level I - Quoted Prices [Member] | ProShares Ultra Silver [Member] | Futures Contracts [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure	[1]	340,736	1,600
Level I - Quoted Prices [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure			287,533,132
Level I - Quoted Prices [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member] | Futures Contracts [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure	[1]	32,503,965	(34,466,120)
Level I - Quoted Prices [Member] | ProShares Ultra Yen [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure			1,997,933
Level I - Quoted Prices [Member] | Proshares UltraPro 3x Crude Oil ETF [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		20,979,876
Level I - Quoted Prices [Member] | Proshares UltraPro 3x Crude Oil ETF [Member] | Futures Contracts [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure	[1]	(23,451,361)	1,417,998
Level I - Quoted Prices [Member] | ProShares UltraPro 3X Short Crude Oil ETF [Member] | Futures Contracts [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure	[1]	7,019,475	(2,988,155)
Level I - Quoted Prices [Member] | ProShares UltraShort Australian Dollar [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		299,537	11,983,904
Level I - Quoted Prices [Member] | ProShares UltraShort Australian Dollar [Member] | Futures Contracts [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure	[1]	511,825	(893,220)
Level I - Quoted Prices [Member] | ProShares UltraShort Bloomberg Crude Oil [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		27,967,534	253,646,823
Level I - Quoted Prices [Member] | ProShares UltraShort Bloomberg Crude Oil [Member] | Futures Contracts [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure	[1]	3,272,155	(3,962,648)
Level I - Quoted Prices [Member] | ProShares UltraShort Bloomberg Natural Gas [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		299,714	3,999,751
Level I - Quoted Prices [Member] | ProShares UltraShort Bloomberg Natural Gas [Member] | Futures Contracts [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure	[1]	10,837,989	(1,097,049)
Level I - Quoted Prices [Member] | ProShares UltraShort Euro [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		121,801,685	204,770,166
Level I - Quoted Prices [Member] | ProShares UltraShort Gold [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		3,989,563	31,977,900
Level I - Quoted Prices [Member] | ProShares UltraShort Gold [Member] | Futures Contracts [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure	[1]	(31,780)	(5,460)
Level I - Quoted Prices [Member] | ProShares UltraShort Silver [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		3,294,766	18,349,861
Level I - Quoted Prices [Member] | ProShares UltraShort Silver [Member] | Futures Contracts [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure	[1]	(44,917)	(1,650)
Level I - Quoted Prices [Member] | ProShares UltraShort Yen [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		34,951,229	131,834,352
Level I - Quoted Prices [Member] | ProShares VIX Mid-Term Futures ETF [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure			20,993,515
Level I - Quoted Prices [Member] | ProShares VIX Mid-Term Futures ETF [Member] | Futures Contracts [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure	[1]	3,758,106	(2,215,280)
Level I - Quoted Prices [Member] | ProShares VIX Short-Term Futures ETF [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		114,785,002	134,845,604
Level I - Quoted Prices [Member] | ProShares VIX Short-Term Futures ETF [Member] | Futures Contracts [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure	[1]	17,378,445	(4,761,877)
Level II - Other Significant Observable Inputs [Member] | Forward Agreements [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		27,771,221	22,177,267
Level II - Other Significant Observable Inputs [Member] | Foreign Currency Forward Contracts [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		(4,384,499)	(4,587,678)
Level II - Other Significant Observable Inputs [Member] | Swap Agreements [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		(53,451,348)	31,631,219
Level II - Other Significant Observable Inputs [Member] | ProShares Ultra Bloomberg Crude Oil [Member] | Swap Agreements [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		(72,767,125)	62,238,361
Level II - Other Significant Observable Inputs [Member] | ProShares Ultra Euro [Member] | Foreign Currency Forward Contracts [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		57,938	264,152
Level II - Other Significant Observable Inputs [Member] | ProShares Ultra Gold [Member] | Forward Agreements [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		4,253,301	3,646,355
Level II - Other Significant Observable Inputs [Member] | ProShares Ultra Silver [Member] | Forward Agreements [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		26,301,717	21,735,334
Level II - Other Significant Observable Inputs [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member] | Swap Agreements [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		(1,330,949)
Level II - Other Significant Observable Inputs [Member] | ProShares Ultra Yen [Member] | Foreign Currency Forward Contracts [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		177,111	(34,824)
Level II - Other Significant Observable Inputs [Member] | ProShares UltraShort Bloomberg Crude Oil [Member] | Swap Agreements [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		20,646,726	(30,607,142)
Level II - Other Significant Observable Inputs [Member] | ProShares UltraShort Euro [Member] | Foreign Currency Forward Contracts [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		(1,495,804)	(6,344,269)
Level II - Other Significant Observable Inputs [Member] | ProShares UltraShort Gold [Member] | Forward Agreements [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		(990,786)	(1,488,259)
Level II - Other Significant Observable Inputs [Member] | ProShares UltraShort Silver [Member] | Forward Agreements [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		(1,793,011)	(1,716,163)
Level II - Other Significant Observable Inputs [Member] | ProShares UltraShort Yen [Member] | Foreign Currency Forward Contracts [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, fair value disclosure		$ (3,123,744)	$ 1,527,263
[1]	Incudes cumulative appreciation/depreciation of futures contracts as reported in the Schedule of Investments. Only current day's variation margin is reported within the Statements of Financial Condition in receivable/payable on open futures.

Significant Accounting Polici_6

Significant Accounting Policies - Additional Information (Detail)	Jul. 31, 2014
Minimum [Member] | Matching VIX Funds [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) - Not Designated as Hedging Instrument [Member] - USD ($)		Dec. 31, 2018	Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset not designated as hedging instrument, Unrealized Appreciation	[1]	$ 131,270,135	$ 136,784,724
Derivative liability not accounted as hedging instrument, Unrealized Depreciation	[1]	148,050,399	100,433,347
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
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
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
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
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 designated as hedging instrument, Unrealized Appreciation	[1]		21,493,549
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 designated as hedging instrument, Unrealized Appreciation	[1]		3,974,642
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 designated as hedging instrument, Unrealized Appreciation	[1]		709,708
VIX Futures Contracts [Member] | Payable On Open Futures Contracts And Unrealized Depreciation On Swap Agreements [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]	15,386,661
VIX Futures Contracts [Member] | Payable On Open Futures Contracts And Unrealized Depreciation On Swap Agreements [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]	2,625,566
VIX Futures Contracts [Member] | Payable On Open Futures Contracts And Unrealized Depreciation On Swap Agreements [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability not accounted as hedging instrument, Unrealized Depreciation	[1]	130,050
VIX Futures Contracts [Member] | Payable On Open Futures Contracts And Unrealized Depreciation On Swap Agreements [Member] | ProShares VIX Short-Term Futures ETF [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability not accounted as hedging instrument, Unrealized Depreciation	[1]	1,014,514
VIX Futures Contracts [Member] | Receivables On Open Futures Contracts And Unrealized Appreciation On Swap Agreements [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset not designated as hedging instrument, Unrealized Appreciation	[1]	910,460
VIX Futures Contracts [Member] | Receivables On Open Futures Contracts And Unrealized Appreciation On Swap Agreements [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset not designated as hedging instrument, Unrealized Appreciation	[1]	33,798,582
VIX Futures Contracts [Member] | Receivables On Open Futures Contracts And Unrealized Appreciation On Swap Agreements [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset not designated as hedging instrument, Unrealized Appreciation	[1]	3,888,156
VIX Futures Contracts [Member] | Receivables On Open Futures Contracts And Unrealized Appreciation On Swap Agreements [Member] | ProShares VIX Short-Term Futures ETF [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset not designated as hedging instrument, Unrealized Appreciation	[1]	18,392,959
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]	86,807,426	34,569,790
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]	10,323,163	1,097,049
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]	1,022,566	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]	1,837,928	1,717,813
Commodity Contracts [Member] | Payable on Open Futures Contracts, Unrealized Depreciation on Swaps and/or Forward Agreements [Member] | Proshares UltraPro 3x Crude Oil ETF [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability not accounted as hedging instrument, Unrealized Depreciation	[1]	23,451,361
Commodity Contracts [Member] | Payable on Open Futures Contracts, Unrealized Depreciation on Swaps and/or Forward Agreements [Member] | ProShares 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] | Receivables on Open Futures Contracts, Unrealized Appreciation on Swaps and/or Forwards Agreements [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset not designated as hedging instrument, Unrealized Appreciation	[1]	23,918,881
Commodity Contracts [Member] | Receivables on Open Futures Contracts, Unrealized Appreciation on Swaps and/or Forwards Agreements [Member] | ProShares UltraShort Bloomberg Natural Gas [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset not designated as hedging instrument, Unrealized Appreciation	[1]	10,837,989
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 designated as hedging instrument, Unrealized Appreciation	[1]		1,417,998
Commodity Contracts [Member] | Receivables on Open Futures Contracts, Unrealized Appreciation on Swaps and/or Forwards Agreements [Member] | ProShares UltraPro 3X Short Crude Oil ETF [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset not designated as hedging instrument, Unrealized Appreciation	[1]	7,019,475
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 designated as hedging instrument, Unrealized Appreciation	[1]		74,184,340
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 designated as hedging instrument, Unrealized Appreciation	[1]		7,225,810
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 designated as hedging instrument, Unrealized Appreciation	[1]	4,325,971	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 designated as hedging instrument, Unrealized Appreciation	[1]	26,642,453	21,736,934
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]	43,281	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		4,033	57,457
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 Ultra Yen [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability not accounted as hedging instrument, Unrealized Depreciation		2,076	34,824
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		1,599,878	6,793,571
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		3,801,896	41,734
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 designated as hedging instrument, Unrealized Appreciation		61,971
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 designated as hedging instrument, Unrealized Appreciation			321,609
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 designated as hedging instrument, Unrealized Appreciation	[1]	511,825
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 designated as hedging instrument, Unrealized Appreciation		179,187
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 designated as hedging instrument, Unrealized Appreciation		104,074	499,302
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 designated as hedging instrument, Unrealized Appreciation		$ 678,152	$ 1,568,997
[1]	Incudes cumulative appreciation/depreciation of futures contracts as reported in the Schedule of Investments. Only current day's variation margin is reported within the Statements of Financial Condition in receivable/payable on open futures.

Investments - Effect of Derivat

Investments - Effect of Derivative Instruments on Statements of Operations (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	$ (1,483,065,223)	$ (438,531,686)	[1]	$ (1,320,602,359)	[2]
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	(52,874,307)	(5,496,117)	[1]	157,868,764	[2]
ProShares VIX Short-Term Futures ETF [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	89,901,119	(194,006,340)		(195,469,141)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	22,155,157	(4,304,579)		612,983
ProShares VIX Mid-Term Futures ETF [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	4,332,654	(25,320,147)		(11,085,007)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	5,973,199	(926,594)		(944,964)
ProShares Short VIX Short-Term Futures ETF [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	(1,885,823,832)	897,400,073		440,379,719
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	(31,465,785)	27,294,500		(21,062,850)
ProShares Ultra VIX Short-Term Futures ETF [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	389,993,011	(1,020,772,793)		(1,567,324,739)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	65,652,401	(26,502,876)		(19,895,547)
ProShares UltraShort Bloomberg Crude Oil [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	(42,039,983)	(6,491,508)		(67,756,228)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	58,511,410	(20,957,983)		(22,509,153)
ProShares UltraShort Bloomberg Natural Gas [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	(14,147,964)	4,761,749		589,999
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	11,934,953	(614,897)		1,988,745
ProShares UltraShort Gold [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	1,323,731	(6,994,765)		(12,241,129)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	472,667	(4,548,271)		1,240,412
ProShares UltraShort Silver [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	5,022,945	1,152,461		(17,556,630)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	(117,191)	(3,132,869)		(3,372,326)
ProShares Ultra Bloomberg Crude Oil [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	21,754,687	22,131,716		74,043,666
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	(160,959,424)	13,257,749		151,007,102
ProShares Ultra Bloomberg Natural Gas [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	21,092,833	(40,794,286)		17,571,111
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	(17,547,032)	4,686,596		(3,776,978)
ProShares Ultra Gold [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	(7,345,178)	11,485,101		5,815,759
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	680,186	8,096,461		(2,198,661)
ProShares Ultra Silver [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	(57,489,729)	(31,762,627)		62,342,586
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	4,931,185	42,712,371		1,571,491
ProShares Short Euro [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	459,984	(1,162,371)		663,807
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	123,365	(299,569)		(110,526)
ProShares UltraShort Australian Dollar [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	128,204	(866,949)		(2,786,709)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	1,406,028	(2,076,278)		1,602,889
ProShares UltraShort Euro [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	18,953,236	(39,695,465)		(25,711,276)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	4,869,355	(22,527,463)		44,885,942
ProShares UltraShort Yen [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	2,111,630	(8,733,473)		(22,226,181)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	(4,640,285)	(15,227,152)		30,657,216
ProShares Ultra Euro [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	(1,063,816)	2,212,226		139,113
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	(205,861)	837,700		(1,178,425)
ProShares Ultra Yen [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	(170,364)	(46,278)		717,052
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	212,218	307,194		(603,897)
Proshares UltraPro 3x Crude Oil ETF [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	(37,435,672)	6,018,618	[3],[4]
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	(24,868,483)	1,417,998	[3],[4]
ProShares UltraPro 3X Short Crude Oil ETF [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	7,377,281	(7,046,628)	[3],[4]
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	10,007,630	(2,988,155)	[3],[4]
Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	(1,482,790,442)	(438,481,644)		(1,319,878,687)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	(53,081,641)	(5,294,115)		157,908,519
Not Designated as Hedging Instrument [Member] | 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	89,903,111	(194,005,568)		(195,475,791)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	22,140,322	(4,293,225)		609,973
Not Designated as Hedging Instrument [Member] | 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	4,332,654	(25,319,770)		(11,085,506)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	5,973,386	(927,035)		(943,885)
Not Designated as Hedging Instrument [Member] | 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	(1,885,564,719)	897,400,516		440,391,389
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	(31,517,650)	27,351,060		(21,056,026)
Not Designated as Hedging Instrument [Member] | 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	390,000,742	(1,020,750,851)		(1,567,340,688)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	65,639,136	(26,493,883)		(19,866,703)
Not Designated as Hedging Instrument [Member] | 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	(42,040,086)	(6,491,060)		(67,752,164)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	58,488,671	(20,936,094)		(22,510,865)
Not Designated as Hedging Instrument [Member] | 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	(14,147,964)	4,762,532		586,860
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	11,935,038	(615,018)		1,989,133
Not Designated as Hedging Instrument [Member] | 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	1,323,579	(6,993,557)		(12,240,751)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	471,153	(4,546,265)		1,238,384
Not Designated as Hedging Instrument [Member] | 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	5,024,976	1,153,393		(17,554,714)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	(120,115)	(3,129,369)		(3,372,693)
Not Designated as Hedging Instrument [Member] | 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	21,756,994	22,146,212		74,061,040
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	(160,991,766)	13,288,604		151,001,639
Not Designated as Hedging Instrument [Member] | 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	21,092,864	(40,793,265)		17,571,809
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	(17,548,973)	4,689,090		(3,776,159)
Not Designated as Hedging Instrument [Member] | 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	(7,345,006)	11,484,410		5,816,562
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	674,136	8,101,902		(2,194,272)
Not Designated as Hedging Instrument [Member] | 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	(57,488,526)	(31,762,834)		62,342,441
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	4,905,519	42,740,483		1,566,582
Not Designated as Hedging Instrument [Member] | 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 UltraPro 3x Crude Oil ETF [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	(37,435,672)	6,018,618
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	(24,869,359)	1,417,998
Not Designated as Hedging Instrument [Member] | 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 UltraPro 3X Short Crude Oil ETF [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	7,377,281	(7,046,628)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	10,007,630	(2,988,155)
Not Designated as Hedging Instrument [Member] | 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	459,984	(1,161,987)		663,774
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	123,007	(299,188)		(110,538)
Not Designated as Hedging Instrument [Member] | 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	128,451	(866,771)		(2,787,204)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	1,405,045	(2,075,560)		1,602,610
Not Designated as Hedging Instrument [Member] | 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	18,953,455	(39,691,680)		(25,711,518)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	4,848,465	(22,507,200)		44,873,267
Not Designated as Hedging Instrument [Member] | 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	2,111,627	(8,729,472)		(22,220,271)
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	(4,651,007)	(15,217,674)		30,640,389
Not Designated as Hedging Instrument [Member] | 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	(1,063,823)	2,212,313		138,959
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	(206,214)	838,162		(1,178,930)
Not Designated as Hedging Instrument [Member] | 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	(170,364)	(46,195)		717,086
Change in Unrealized Appreciation/ Depreciation on Derivatives Recognized in Income	$ 211,935	$ 307,252		$ (603,387)
[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]	Since the Fund's inception date was January 13, 2017, the Statement of Changes in Shareholders' Equity for the year ended December 31, 2016 has not been provided.
[4]	Since the Fund's inception date was January 13, 2017, the Statement of Operations for the year ended December 31, 2016 has not been provided.

Investments - Offsetting of Fin

Investments - Offsetting of Financial Assets and Liabilities (Detail) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Swap Agreements [Member]
Derivative [Line Items]
Net Amounts of Assets presented in the Statements of Financial Condition	$ 20,646,726	$ 62,238,361
Net Amounts of Liabilities presented in the Statements of Financial Condition	74,098,074	30,607,142
Foreign Currency Forward Contracts [Member]
Derivative [Line Items]
Net Amounts of Assets presented in the Statements of Financial Condition	1,023,384	2,339,908
Net Amounts of Liabilities presented in the Statements of Financial Condition	5,407,883	6,927,586
Forward Agreements [Member]
Derivative [Line Items]
Net Amounts of Assets presented in the Statements of Financial Condition	30,555,018	25,381,689
Net Amounts of Liabilities presented in the Statements of Financial Condition	2,783,797	3,204,422
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
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
Gross Amounts of Recognized Liabilities presented in the Statements of Financial Condition	72,767,125
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Liabilities presented in the Statements of Financial Condition	72,767,125
ProShares Ultra Euro [Member] | Foreign Currency Forward Contracts [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets presented in the Statements of Financial Condition	61,971	321,609
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Assets presented in the Statements of Financial Condition	61,971	321,609
Gross Amounts of Recognized Liabilities presented in the Statements of Financial Condition	4,033	57,457
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Liabilities presented in the Statements of Financial Condition	4,033	57,457
ProShares Ultra Gold [Member] | Forward Agreements [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets presented in the Statements of Financial Condition	4,253,301	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	4,253,301	3,646,355
Gross Amounts Offset in the Statements of Financial Condition	0	0
ProShares Ultra Silver [Member] | Forward Agreements [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets presented in the Statements of Financial Condition	26,301,717	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	26,301,717	21,735,334
Gross Amounts Offset in the Statements of Financial Condition	0	0
ProShares Ultra VIX Short-Term Futures ETF [Member] | Swap Agreements [Member]
Derivative [Line Items]
Gross Amounts Offset in the Statements of Financial Condition	0
Gross Amounts of Recognized Liabilities presented in the Statements of Financial Condition	1,330,949
Gross Amounts Offset in the Statements of Financial Condition	0
Net Amounts of Liabilities presented in the Statements of Financial Condition	1,330,949
ProShares Ultra Yen [Member] | Foreign Currency Forward Contracts [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets presented in the Statements of Financial Condition	179,187
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Assets presented in the Statements of Financial Condition	179,187
Gross Amounts of Recognized Liabilities presented in the Statements of Financial Condition	2,076	34,824
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Liabilities presented in the Statements of Financial Condition	2,076	34,824
ProShares UltraShort Bloomberg Crude Oil [Member] | Swap Agreements [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets presented in the Statements of Financial Condition	20,646,726
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Assets presented in the Statements of Financial Condition	20,646,726
Gross Amounts of Recognized Liabilities presented in the Statements of Financial Condition		30,607,142
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
ProShares UltraShort Euro [Member] | Foreign Currency Forward Contracts [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets presented in the Statements of Financial Condition	104,074	449,302
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Assets presented in the Statements of Financial Condition	104,074	449,302
Gross Amounts of Recognized Liabilities presented in the Statements of Financial Condition	1,599,878	6,793,571
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Liabilities presented in the Statements of Financial Condition	1,599,878	6,793,571
ProShares UltraShort Gold [Member] | Forward 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	990,786	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	990,786	1,488,259
ProShares UltraShort Silver [Member] | Forward 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	1,793,011	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	1,793,011	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	678,152	1,568,997
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Assets presented in the Statements of Financial Condition	678,152	1,568,997
Gross Amounts of Recognized Liabilities presented in the Statements of Financial Condition	3,801,896	41,734
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Liabilities presented in the Statements of Financial Condition	$ 3,801,896	$ 41,734

Investments - Gross Amounts Not

Investments - Gross Amounts Not Offset in Statements of Financial Condition (Detail) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
ProShares Ultra Bloomberg Crude Oil [Member] | Citibank N.A. [Member]
Derivative [Line Items]
Amounts of Recognized Assets / (Liabilities) presented in the Statements of Financial Condition	$ (22,752,565)	$ 19,815,892
Financial Instruments for the Benefit of (the Funds) / the Counterparties	20,667,565
Cash Collateral for the Benefit of (the Funds) / the Counterparties	2,085,000
Net Amounts		19,815,892
ProShares Ultra Bloomberg Crude Oil [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets / (Liabilities) presented in the Statements of Financial Condition	(15,691,687)	16,654,031
Financial Instruments for the Benefit of (the Funds) / the Counterparties	10,417,687	(14,861,090)
Cash Collateral for the Benefit of (the Funds) / the Counterparties	5,274,000
Net Amounts		1,792,941
ProShares Ultra Bloomberg Crude Oil [Member] | Royal Bank of Canada [Member]
Derivative [Line Items]
Amounts of Recognized Assets / (Liabilities) presented in the Statements of Financial Condition	(13,836,386)
Financial Instruments for the Benefit of (the Funds) / the Counterparties	13,836,386
ProShares Ultra Bloomberg Crude Oil [Member] | Societe Generale S.A. [Member]
Derivative [Line Items]
Amounts of Recognized Assets / (Liabilities) presented in the Statements of Financial Condition	(5,206,589)	9,003,519
Financial Instruments for the Benefit of (the Funds) / the Counterparties	1,491,589	(8,525,505)
Cash Collateral for the Benefit of (the Funds) / the Counterparties	3,715,000
Net Amounts		478,014
ProShares Ultra Bloomberg Crude Oil [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets / (Liabilities) presented in the Statements of Financial Condition	(15,279,898)	16,764,919
Financial Instruments for the Benefit of (the Funds) / the Counterparties	15,156,898	(15,477,566)
Cash Collateral for the Benefit of (the Funds) / the Counterparties	123,000
Net Amounts		1,287,353
ProShares Ultra Euro [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets / (Liabilities) presented in the Statements of Financial Condition	26,209	102,424
Net Amounts	26,209	102,424
ProShares Ultra Euro [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets / (Liabilities) presented in the Statements of Financial Condition	31,729	161,728
Net Amounts	31,729	161,728
ProShares Ultra Gold [Member] | Citibank N.A. [Member]
Derivative [Line Items]
Amounts of Recognized Assets / (Liabilities) presented in the Statements of Financial Condition	1,682,026	1,513,310
Financial Instruments for the Benefit of (the Funds) / the Counterparties	(1,682,026)
Net Amounts		1,513,310
ProShares Ultra Gold [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets / (Liabilities) presented in the Statements of Financial Condition	1,223,528	969,501
Financial Instruments for the Benefit of (the Funds) / the Counterparties	(1,223,528)	(967,678)
Cash Collateral for the Benefit of (the Funds) / the Counterparties		(1,823)
ProShares Ultra Gold [Member] | Societe Generale S.A. [Member]
Derivative [Line Items]
Amounts of Recognized Assets / (Liabilities) presented in the Statements of Financial Condition	61,260	218,319
Net Amounts	61,260	218,319
ProShares Ultra Gold [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets / (Liabilities) presented in the Statements of Financial Condition	1,286,487	945,225
Financial Instruments for the Benefit of (the Funds) / the Counterparties	(1,286,487)	(945,225)
ProShares Ultra Silver [Member] | Citibank N.A. [Member]
Derivative [Line Items]
Amounts of Recognized Assets / (Liabilities) presented in the Statements of Financial Condition	9,662,061	7,201,744
Financial Instruments for the Benefit of (the Funds) / the Counterparties	(8,053,860)
Net Amounts	1,608,201	7,201,744
ProShares Ultra Silver [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets / (Liabilities) presented in the Statements of Financial Condition	8,418,745	5,873,080
Financial Instruments for the Benefit of (the Funds) / the Counterparties	(1,655,971)	(4,903,696)
Net Amounts	6,762,774	969,384
ProShares Ultra Silver [Member] | Societe Generale S.A. [Member]
Derivative [Line Items]
Amounts of Recognized Assets / (Liabilities) presented in the Statements of Financial Condition	118,797	2,761,817
Financial Instruments for the Benefit of (the Funds) / the Counterparties		(2,516,153)
Net Amounts	118,797	245,664
ProShares Ultra Silver [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets / (Liabilities) presented in the Statements of Financial Condition	8,102,114	5,898,693
Financial Instruments for the Benefit of (the Funds) / the Counterparties	(6,971,401)	(4,930,596)
Net Amounts	1,130,713	968,097
ProShares Ultra VIX Short-Term Futures ETF [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets / (Liabilities) presented in the Statements of Financial Condition	(1,330,949)
Cash Collateral for the Benefit of (the Funds) / the Counterparties	1,330,949
ProShares Ultra Yen [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets / (Liabilities) presented in the Statements of Financial Condition	73,705	(17,410)
Financial Instruments for the Benefit of (the Funds) / the Counterparties		17,410
Net Amounts	73,705
ProShares Ultra Yen [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets / (Liabilities) presented in the Statements of Financial Condition	103,406	(17,414)
Financial Instruments for the Benefit of (the Funds) / the Counterparties		17,414
Net Amounts	103,406
ProShares UltraShort Bloomberg Crude Oil [Member] | Citibank N.A. [Member]
Derivative [Line Items]
Amounts of Recognized Assets / (Liabilities) presented in the Statements of Financial Condition	8,336,367	(10,173,164)
Financial Instruments for the Benefit of (the Funds) / the Counterparties	(8,336,367)	10,173,164
ProShares UltraShort Bloomberg Crude Oil [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets / (Liabilities) presented in the Statements of Financial Condition	2,752,372	(9,242,398)
Financial Instruments for the Benefit of (the Funds) / the Counterparties	(2,752,372)	9,242,398
ProShares UltraShort Bloomberg Crude Oil [Member] | Royal Bank of Canada [Member]
Derivative [Line Items]
Amounts of Recognized Assets / (Liabilities) presented in the Statements of Financial Condition	4,237,960
Cash Collateral for the Benefit of (the Funds) / the Counterparties	(4,237,960)
ProShares UltraShort Bloomberg Crude Oil [Member] | Societe Generale S.A. [Member]
Derivative [Line Items]
Amounts of Recognized Assets / (Liabilities) presented in the Statements of Financial Condition	1,891,050	(1,904,113)
Financial Instruments for the Benefit of (the Funds) / the Counterparties	(1,891,050)	1,904,113
ProShares UltraShort Bloomberg Crude Oil [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets / (Liabilities) presented in the Statements of Financial Condition	3,428,977	(9,287,467)
Financial Instruments for the Benefit of (the Funds) / the Counterparties	(3,428,977)	9,287,467
ProShares UltraShort Euro [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets / (Liabilities) presented in the Statements of Financial Condition	(610,002)	(3,297,612)
Financial Instruments for the Benefit of (the Funds) / the Counterparties	610,002	259,612
Cash Collateral for the Benefit of (the Funds) / the Counterparties		3,038,000
ProShares UltraShort Euro [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets / (Liabilities) presented in the Statements of Financial Condition	(885,802)	(3,046,657)
Financial Instruments for the Benefit of (the Funds) / the Counterparties		3,046,657
Cash Collateral for the Benefit of (the Funds) / the Counterparties	885,802
ProShares UltraShort Gold [Member] | Citibank N.A. [Member]
Derivative [Line Items]
Amounts of Recognized Assets / (Liabilities) presented in the Statements of Financial Condition	(380,655)	(554,559)
Financial Instruments for the Benefit of (the Funds) / the Counterparties	119,655	554,559
Cash Collateral for the Benefit of (the Funds) / the Counterparties	261,000
ProShares UltraShort Gold [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets / (Liabilities) presented in the Statements of Financial Condition	(258,134)	(428,358)
Financial Instruments for the Benefit of (the Funds) / the Counterparties		428,358
Cash Collateral for the Benefit of (the Funds) / the Counterparties	258,134
ProShares UltraShort Gold [Member] | Societe Generale S.A. [Member]
Derivative [Line Items]
Amounts of Recognized Assets / (Liabilities) presented in the Statements of Financial Condition	(63,076)	(126,928)
Financial Instruments for the Benefit of (the Funds) / the Counterparties		126,928
Cash Collateral for the Benefit of (the Funds) / the Counterparties	63,076
ProShares UltraShort Gold [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets / (Liabilities) presented in the Statements of Financial Condition	(288,921)	(378,414)
Financial Instruments for the Benefit of (the Funds) / the Counterparties		378,414
Cash Collateral for the Benefit of (the Funds) / the Counterparties	288,921
ProShares UltraShort Silver [Member] | Citibank N.A. [Member]
Derivative [Line Items]
Amounts of Recognized Assets / (Liabilities) presented in the Statements of Financial Condition	(566,050)	(632,593)
Financial Instruments for the Benefit of (the Funds) / the Counterparties		632,593
Cash Collateral for the Benefit of (the Funds) / the Counterparties	566,050
ProShares UltraShort Silver [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets / (Liabilities) presented in the Statements of Financial Condition	(605,756)	(486,240)
Cash Collateral for the Benefit of (the Funds) / the Counterparties	605,756	486,240
ProShares UltraShort Silver [Member] | Societe Generale S.A. [Member]
Derivative [Line Items]
Amounts of Recognized Assets / (Liabilities) presented in the Statements of Financial Condition	(119,953)	(115,305)
Financial Instruments for the Benefit of (the Funds) / the Counterparties		115,305
Cash Collateral for the Benefit of (the Funds) / the Counterparties	119,953
ProShares UltraShort Silver [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets / (Liabilities) presented in the Statements of Financial Condition	(501,252)	(482,025)
Financial Instruments for the Benefit of (the Funds) / the Counterparties		482,025
Cash Collateral for the Benefit of (the Funds) / the Counterparties	501,252
ProShares UltraShort Yen [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets / (Liabilities) presented in the Statements of Financial Condition	(1,425,071)	821,317
Financial Instruments for the Benefit of (the Funds) / the Counterparties		(810,030)
Cash Collateral for the Benefit of (the Funds) / the Counterparties	1,425,071
Net Amounts		11,287
ProShares UltraShort Yen [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets / (Liabilities) presented in the Statements of Financial Condition	(1,698,673)	705,946
Financial Instruments for the Benefit of (the Funds) / the Counterparties	1,571,673
Cash Collateral for the Benefit of (the Funds) / the Counterparties	$ 127,000	$ (705,946)

Agreements - Additional Informa

Agreements - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018USD ($)
Investment Holdings [Line Items]
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%
Leveraged Fund [Member]
Investment Holdings [Line Items]
Management Fee paid to sponsor, percent per annum of the average daily NAV of each Geared Fund	0.95%
GearedVix Funds [Member]
Investment Holdings [Line Items]
Management Fee paid to sponsor, percent per annum of the average daily NAV of each Geared Fund	0.95%
ProShares Short Euro [Member]
Investment Holdings [Line Items]
Management Fee paid to sponsor, percent per annum of the average daily NAV of each Geared Fund	0.95%
Matching VIX Funds [Member]
Investment Holdings [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, 2018	Dec. 31, 2017	[1],[2]
Investment Holdings [Line Items]
Offering costs, amortization period		12 months
Proshares UltraPro 3x Crude Oil ETF [Member]
Investment Holdings [Line Items]
Expense ratio, excluding brokerage commissions and fees		0.95%	0.95%
ProShares UltraPro 3X Short Crude Oil ETF [Member]
Investment Holdings [Line Items]
Expense ratio, excluding brokerage commissions and fees	[3]	0.95%	0.95%
Fee Waiver Description		The Sponsor has reimbursed ProShares UltraPro 3x Crude Oil ETF and ProShares UltraPro 3x Short Crude Oil ETF to the extent that their respective offering costs exceeded 0.95% of their average daily NAV during their first year of operations.
[1]	From commencement of operations, March 24, 2017 through December 31, 2017.
[2]	Percentages are annualized.
[3]	See Note 1 of these Notes to Financial Statements.

Creation and Redemption of Cr_3

Creation and Redemption of Creation Units - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018$ / 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%
Matching VIX Funds [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 Cr_4

Creation and Redemption of Creation Units - Schedule of Transaction Fees (Detail) - USD ($)		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Investment Holdings [Line Items]
Transaction fees		$ 3,655,553	$ 3,138,503	$ 3,906,425	[1]
ProShares Short VIX Short-Term Futures ETF [Member]
Investment Holdings [Line Items]
Transaction fees		699,323	1,008,452	801,564	[1]
ProShares Ultra Bloomberg Crude Oil [Member]
Investment Holdings [Line Items]
Transaction fees		235,966	610,969	504,533	[1]
ProShares Ultra Bloomberg Natural Gas [Member]
Investment Holdings [Line Items]
Transaction fees		16,562	15,937	9,175	[1]
ProShares Ultra Gold [Member]
Investment Holdings [Line Items]
Transaction fees		10,139	14,460	14,138	[1]
ProShares Ultra Silver [Member]
Investment Holdings [Line Items]
Transaction fees		26,173	28,622	47,414	[1]
ProShares Ultra VIX Short-Term Futures ETF [Member]
Investment Holdings [Line Items]
Transaction fees		2,194,669	1,036,162	1,822,247	[1]
Proshares UltraPro 3x Crude Oil ETF [Member]
Investment Holdings [Line Items]
Transaction fees		81,882	25,455
ProShares UltraPro 3X Short Crude Oil ETF [Member]
Investment Holdings [Line Items]
Transaction fees		46,345	14,096
ProShares UltraShort Bloomberg Crude Oil [Member]
Investment Holdings [Line Items]
Transaction fees		135,524	207,707	398,027	[1]
ProShares UltraShort Bloomberg Natural Gas [Member]
Investment Holdings [Line Items]
Transaction fees		9,616	4,713	8,989	[1]
ProShares UltraShort Gold [Member]
Investment Holdings [Line Items]
Transaction fees		10,644	15,945	29,854	[1]
ProShares UltraShort Silver [Member]
Investment Holdings [Line Items]
Transaction fees	[1]			16,729
ProShares VIX Mid-Term Futures ETF [Member]
Investment Holdings [Line Items]
Transaction fees		27,723	13,605	24,056	[1]
ProShares VIX Short-Term Futures ETF [Member]
Investment Holdings [Line Items]
Transaction fees		$ 160,987	$ 142,380	$ 229,699	[1]
[1]	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.

Financial Highlights - Per Shar

Financial Highlights - Per Share Operating Performance (Detail) - $ / shares		12 Months Ended
		Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
ProShares Short Euro [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance		$ 39.96		$ 45.06		$ 43.78
Net investment income (loss)		0.22		(0.14)		(0.33)
Net realized and unrealized gain (loss)	[1]	2.92		(4.96)		1.61
Change in net asset value from operations		3.14		(5.10)		1.28
Net asset value, ending balance		43.10		39.96		45.06
Market value per share, beginning balance	[2]	39.99		45.12		43.74
Market value per share, ending balance	[2]	$ 43.08		$ 39.99		$ 45.12
Total Return, at net asset value		7.90%		(11.30%)		2.90%
Total Return, at market value		7.70%		(11.40%)		3.20%
Ratios to Average Net Assets
Expense ratio		0.97%		0.97%		0.97%
Expense ratio, excluding brokerage commissions		0.95%		0.95%		0.95%
Net investment income (loss)		0.54%		(0.32%)		(0.76%)
ProShares Short VIX Short-Term Futures ETF [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance	[3]	$ 509.20		$ 182.46		$ 101.63
Net investment income (loss)	[3]	(0.23)		(2.41)		(1.22)
Net realized and unrealized gain (loss)	[1],[3]	(466.61)		329.15		82.05
Change in net asset value from operations	[3]	(466.84)		326.74		80.83
Net asset value, ending balance	[3]	42.36		509.20		182.46
Market value per share, beginning balance	[2],[3]	512.84		181.96		100.92
Market value per share, ending balance	[2],[3]	$ 42.30		$ 512.84		$ 181.96
Total Return, at net asset value	[3]	(91.70%)		179.00%		79.50%
Total Return, at market value	[3]	(91.80%)		181.80%		80.30%
Ratios to Average Net Assets
Expense ratio	[3]	1.34%		1.51%		1.39%
Expense ratio, excluding brokerage commissions	[3]	0.95%		0.95%		0.95%
Net investment income (loss)	[3]	(0.37%)		(0.71%)		(1.15%)
ProShares Ultra Bloomberg Crude Oil [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance		$ 23.66		$ 23.34	[3]	$ 25.15	[3]
Net investment income (loss)		0.20		(0.03)		(0.15)	[3]
Net realized and unrealized gain (loss)	[1]	(10.80)		0.35		(1.66)	[3]
Change in net asset value from operations		(10.60)		0.32		(1.81)	[3]
Net asset value, ending balance		13.06		23.66		23.34	[3]
Market value per share, beginning balance	[2]	23.44		23.36	[3]	25.08	[3]
Market value per share, ending balance	[2]	$ 13.30		$ 23.44		$ 23.36	[3]
Total Return, at net asset value		(44.80%)		1.40%		(7.20%)	[3]
Total Return, at market value		(43.30%)		0.30%		(6.90%)	[3]
Ratios to Average Net Assets
Expense ratio		0.97%		0.98%		1.01%	[3]
Expense ratio, excluding brokerage commissions		0.95%		0.95%		0.95%	[3]
Net investment income (loss)		0.73%		(0.18%)		(0.76%)	[3]
ProShares Ultra Bloomberg Natural Gas [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance	[3]	$ 32.64		$ 94.24		$ 92.85
Net investment income (loss)	[3]	0.09		(0.23)		(0.79)
Net realized and unrealized gain (loss)	[1],[3]	(7.45)		(61.37)		2.18
Change in net asset value from operations	[3]	(7.36)		(61.60)		1.39
Net asset value, ending balance	[3]	25.28		32.64		94.24
Market value per share, beginning balance	[2],[3]	32.50		94.80		92.40
Market value per share, ending balance	[2],[3]	$ 25.82		$ 32.50		$ 94.80
Total Return, at net asset value	[3]	(22.50%)		(65.40%)		1.50%
Total Return, at market value	[3]	(20.60%)		(65.70%)		2.60%
Ratios to Average Net Assets
Expense ratio	[3]	1.22%		1.22%		1.34%
Expense ratio, excluding brokerage commissions	[3]	0.95%		0.95%		0.95%
Net investment income (loss)	[3]	0.30%		(0.50%)		(1.12%)
ProShares Ultra Euro [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance		$ 17.44		$ 14.02		$ 15.51
Net investment income (loss)		0.06		(0.04)		(0.11)
Net realized and unrealized gain (loss)	[1]	(2.41)		3.46		(1.38)
Change in net asset value from operations		(2.35)		3.42		(1.49)
Net asset value, ending balance		15.09		17.44		14.02
Market value per share, beginning balance	[2]	17.46		14.09		15.51
Market value per share, ending balance	[2]	$ 15.12		$ 17.46		$ 14.09
Total Return, at net asset value		(13.50%)		24.40%		(9.60%)
Total Return, at market value		(13.40%)		23.90%		(9.20%)
Ratios to Average Net Assets
Expense ratio		0.95%		0.95%		0.95%
Expense ratio, excluding brokerage commissions		0.95%		0.95%		0.95%
Net investment income (loss)		0.36%		(0.23%)		(0.71%)
ProShares Ultra Gold [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance		$ 39.88		$ 32.90		$ 29.73
Net investment income (loss)		0.28		(0.06)		(0.28)
Net realized and unrealized gain (loss)	[1]	(3.04)		7.04		3.45
Change in net asset value from operations		(2.76)		6.98		3.17
Net asset value, ending balance		37.12		39.88		32.90
Market value per share, beginning balance	[2]	40.67		33.20		29.73
Market value per share, ending balance	[2]	$ 37.41		$ 40.67		$ 33.20
Total Return, at net asset value		(6.90%)		21.20%		10.70%
Total Return, at market value		(8.00%)		22.50%		11.70%
Ratios to Average Net Assets
Expense ratio		0.95%		0.95%		0.95%
Expense ratio, excluding brokerage commissions		0.95%		0.95%		0.95%
Net investment income (loss)		0.73%		(0.14%)		(0.69%)
ProShares Ultra Silver [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance		$ 33.55		$ 33.44		$ 27.06
Net investment income (loss)		0.20		(0.05)		(0.27)
Net realized and unrealized gain (loss)	[1]	(7.36)		0.16		6.65
Change in net asset value from operations		(7.16)		0.11		6.38
Net asset value, ending balance		26.39		33.55		33.44
Market value per share, beginning balance	[2]	33.85	[4]	32.09	[4]	27.08
Market value per share, ending balance	[2]	$ 26.37		$ 33.85	[4]	$ 32.09	[4]
Total Return, at net asset value		(21.30%)		0.30%		23.60%
Total Return, at market value		(22.10%)		5.50%		18.50%
Ratios to Average Net Assets
Expense ratio		0.95%		0.95%		0.95%
Expense ratio, excluding brokerage commissions		0.95%		0.95%		0.95%
Net investment income (loss)		0.69%		(0.15%)		(0.69%)
ProShares Ultra VIX Short-Term Futures ETF [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance	[3]	$ 51.67		$ 869.63		$ 14,042.01
Net investment income (loss)	[3]	(0.40)		(1.66)		(38.39)
Net realized and unrealized gain (loss)	[1],[3]	30.19		(816.30)		(13,133.99)
Change in net asset value from operations	[3]	29.79		(817.96)		(13,172.38)
Net asset value, ending balance	[3]	81.46		51.67		869.63
Market value per share, beginning balance	[2],[3]	51.05	[4]	875	[4]	14,175
Market value per share, ending balance	[2],[3]	$ 81.73		$ 51.05	[4]	$ 875	[4]
Total Return, at net asset value	[3]	57.70%		(94.10%)		(93.80%)
Total Return, at market value	[3]	60.10%		(94.20%)		(93.80%)
Ratios to Average Net Assets
Expense ratio	[3]	1.68%		1.90%		1.57%
Expense ratio, excluding brokerage commissions	[3]	0.95%		0.95%		0.85%
Net investment income (loss)	[3]	(0.75%)		(1.17%)		(1.32%)
ProShares Ultra Yen [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance		$ 57.32		$ 55.43		$ 54.75
Net investment income (loss)		(0.02)		(0.24)		(0.45)
Net realized and unrealized gain (loss)	[1]	0.23		2.13		1.13
Change in net asset value from operations		0.21		1.89		0.68
Net asset value, ending balance		57.53		57.32		55.43
Market value per share, beginning balance	[2]	57.45	[4]	55.52	[4]	54.70
Market value per share, ending balance	[2]	$ 57.55		$ 57.45	[4]	$ 55.52	[4]
Total Return, at net asset value		0.40%		3.40%		1.20%
Total Return, at market value		0.20%		3.50%		1.50%
Ratios to Average Net Assets
Expense ratio		0.95%		0.95%		0.95%
Expense ratio, excluding brokerage commissions		0.95%		0.95%		0.95%
Net investment income (loss)		(0.03%)		(0.41%)		(0.69%)
ProShares UltraShort Australian Dollar [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance		$ 45.67		$ 55.38		$ 58.46
Net investment income (loss)		0.23		(0.17)		(0.43)
Net realized and unrealized gain (loss)	[1]	9.40		(9.54)		(2.65)
Change in net asset value from operations		9.63		(9.71)		(3.08)
Net asset value, ending balance		55.30		45.67		55.38
Market value per share, beginning balance	[2]	45.72	[4]	55.24	[4]	58.15
Market value per share, ending balance	[2]	$ 54.92		$ 45.72	[4]	$ 55.24	[4]
Total Return, at net asset value		21.10%		(17.50%)		(5.30%)
Total Return, at market value		20.10%		(17.20%)		(5.00%)
Ratios to Average Net Assets
Expense ratio		1.03%		1.02%		1.03%
Expense ratio, excluding brokerage commissions		0.95%		0.95%		0.95%
Net investment income (loss)		0.46%		(0.36%)		(0.79%)
ProShares UltraShort Bloomberg Crude Oil [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance		$ 24.31		$ 31.70	[3]	$ 66.60	[3]
Net investment income (loss)		0.11		(0.06)		(0.36)	[3]
Net realized and unrealized gain (loss)	[1]	5.37		(7.33)		(34.54)	[3]
Change in net asset value from operations		5.48		(7.39)		(34.90)	[3]
Net asset value, ending balance		29.79		24.31		31.70	[3]
Market value per share, beginning balance	[2]	24.56		31.65	[3]	66.82	[3]
Market value per share, ending balance	[2]	$ 29.28		$ 24.56		$ 31.65	[3]
Total Return, at net asset value		22.50%		(23.30%)		(52.40%)	[3]
Total Return, at market value		19.20%		(22.40%)		(52.60%)	[3]
Ratios to Average Net Assets
Expense ratio		0.98%		0.99%		1.03%	[3]
Expense ratio, excluding brokerage commissions		0.95%		0.95%		0.95%	[3]
Net investment income (loss)		0.59%		(0.17%)		(0.76%)	[3]
ProShares UltraShort Bloomberg Natural Gas [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance		$ 39.48		$ 23.10	[3]	$ 46.53	[3]
Net investment income (loss)		(0.01)		(0.27)		(0.68)	[3]
Net realized and unrealized gain (loss)	[1]	(17.86)		16.65		(22.75)	[3]
Change in net asset value from operations		(17.87)		16.38		(23.43)	[3]
Net asset value, ending balance		21.61		39.48		23.10	[3]
Market value per share, beginning balance	[2]	39.65		23.05	[3]	46.55	[3]
Market value per share, ending balance	[2]	$ 21.22		$ 39.65		$ 23.05	[3]
Total Return, at net asset value		(45.30%)		70.90%		(50.40%)	[3]
Total Return, at market value		(46.50%)		72.00%		(50.50%)	[3]
Ratios to Average Net Assets
Expense ratio		1.41%		1.39%		1.65%	[3]
Expense ratio, excluding brokerage commissions		0.95%		0.95%		0.95%	[3]
Net investment income (loss)		(0.05%)		(0.81%)		(1.43%)	[3]
Proshares UltraPro 3x Crude Oil ETF [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance	[5]	$ 37.78		$ 25
Net investment income (loss)		(0.04)		(0.21)	[5]
Net realized and unrealized gain (loss)	[1]	(24.66)		12.99	[5]
Change in net asset value from operations		(24.70)		12.78	[5]
Net asset value, ending balance		13.08		37.78	[5]	$ 25	[5]
Market value per share, beginning balance	[4],[5]	37.23	[2]	25
Market value per share, ending balance		$ 13.47	[2]	$ 37.23	[2],[4],[5]	25	[4],[5]
Total Return, at net asset value		(65.40%)		51.10%	[5],[6]
Total Return, at market value		(63.80%)		48.90%	[5],[6]
Ratios to Average Net Assets
Expense ratio		1.22%		1.30%	[5],[7]
Expense ratio, excluding brokerage commissions		0.95%		0.95%	[5],[7]
Net investment income (loss)		(0.12%)		(1.20%)	[5],[7]
ProShares UltraPro 3X Short Crude Oil ETF [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance	[3],[5]	$ 42.32		$ 100
Net investment income (loss)	[3]	(0.12)		(0.66)	[5]
Net realized and unrealized gain (loss)	[1],[3]	7.59		(57.02)	[5]
Change in net asset value from operations	[3]	7.47		(57.68)	[5]
Net asset value, ending balance	[3]	49.79		42.32	[5]	100	[5]
Market value per share, beginning balance	[3],[4],[5]	42.88	[2]	100
Market value per share, ending balance	[3]	$ 48.43	[2]	$ 42.88	[2],[4],[5]	100	[4],[5]
Total Return, at net asset value	[3]	17.70%		(57.70%)	[5],[6]
Total Return, at market value	[3]	12.90%		(57.10%)	[5],[6]
Ratios to Average Net Assets
Expense ratio	[3]	1.24%		1.32%	[5],[7]
Expense ratio, excluding brokerage commissions	[3]	0.95%		0.95%	[5],[7]
Net investment income (loss)	[3]	(0.45%)		(1.25%)	[5],[7]
ProShares UltraShort Euro [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance		$ 21.21		$ 27.08		25.54
Net investment income (loss)		0.16		(0.04)		(0.17)
Net realized and unrealized gain (loss)	[1]	2.90		(5.83)		1.71
Change in net asset value from operations		3.06		(5.87)		1.54
Net asset value, ending balance		24.27		21.21		27.08
Market value per share, beginning balance	[2]	21.20		27.08		25.53
Market value per share, ending balance	[2]	$ 24.25		$ 21.20		$ 27.08
Total Return, at net asset value		14.40%		(21.70%)		6.00%
Total Return, at market value		14.40%		(21.70%)		6.10%
Ratios to Average Net Assets
Expense ratio		0.95%		0.95%		0.95%
Expense ratio, excluding brokerage commissions		0.95%		0.95%		0.95%
Net investment income (loss)		0.73%		(0.15%)		(0.70%)
ProShares UltraShort Gold [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance		$ 70.47		$ 91.33		$ 115.88
Net investment income (loss)		0.47		(0.13)		(0.55)
Net realized and unrealized gain (loss)	[1]	2.34		(20.73)		(24)
Change in net asset value from operations		2.81		(20.86)		(24.55)
Net asset value, ending balance		73.28		70.47		91.33
Market value per share, beginning balance	[2]	69.11		90.54		115.83
Market value per share, ending balance	[2]	$ 72.84		$ 69.11		$ 90.54
Total Return, at net asset value		4.00%		(22.80%)		(21.20%)
Total Return, at market value		5.40%		(23.70%)		(21.80%)
Ratios to Average Net Assets
Expense ratio		0.95%		0.95%		0.95%
Expense ratio, excluding brokerage commissions		0.95%		0.95%		0.95%
Net investment income (loss)		0.64%		(0.17%)		(0.70%)
ProShares UltraShort Silver [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance		$ 31.71		$ 37.31		$ 64.58
Net investment income (loss)		0.20		(0.06)		(0.26)
Net realized and unrealized gain (loss)	[1]	5.22		(5.54)		(27.01)
Change in net asset value from operations		5.42		(5.60)		(27.27)
Net asset value, ending balance		37.13		31.71		37.31
Market value per share, beginning balance	[2]	31.40		38.76		64.55
Market value per share, ending balance	[2]	$ 37.10		$ 31.40		$ 38.76
Total Return, at net asset value		17.10%		(15.00%)		(42.20%)
Total Return, at market value		18.20%		(19.00%)		(40.00%)
Ratios to Average Net Assets
Expense ratio		0.95%		0.95%		0.95%
Expense ratio, excluding brokerage commissions		0.95%		0.95%		0.95%
Net investment income (loss)		0.55%		(0.18%)		(0.70%)
ProShares UltraShort Yen [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance		$ 74.93		$ 80.24		$ 87.94
Net investment income (loss)		0.53		(0.14)		(0.50)
Net realized and unrealized gain (loss)	[1]	(1.57)		(5.17)		(7.20)
Change in net asset value from operations		(1.04)		(5.31)		(7.70)
Net asset value, ending balance		73.89		74.93		80.24
Market value per share, beginning balance	[2]	74.98		80.25		87.89
Market value per share, ending balance	[2]	$ 73.86		$ 74.98		$ 80.25
Total Return, at net asset value		(1.40%)		(6.60%)		(8.80%)
Total Return, at market value		(1.50%)		(6.60%)		(8.70%)
Ratios to Average Net Assets
Expense ratio		0.95%		0.95%		0.95%
Expense ratio, excluding brokerage commissions		0.95%		0.95%		0.95%
Net investment income (loss)		0.73%		(0.19%)		(0.71%)
ProShares VIX Mid-Term Futures ETF [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance		$ 21.29		$ 42.14		$ 53.96
Net investment income (loss)		0.10		(0.06)		(0.33)
Net realized and unrealized gain (loss)	[1]	5.26		(20.79)		(11.49)
Change in net asset value from operations		5.36		(20.85)		(11.82)
Net asset value, ending balance		26.65		21.29		42.14
Market value per share, beginning balance	[2]	21.15		42.34		53.99
Market value per share, ending balance	[2]	$ 26.74		$ 21.15		$ 42.34
Total Return, at net asset value		25.20%		(49.50%)		(21.90%)
Total Return, at market value		26.40%		(50.00%)		(21.60%)
Ratios to Average Net Assets
Expense ratio		0.97%		0.91%		0.93%
Expense ratio, excluding brokerage commissions		0.85%		0.85%		0.85%
Net investment income (loss)		0.45%		(0.22%)		(0.68%)
ProShares VIX Short-Term Futures ETF [Member]
Investment Company, Financial Highlights [Line Items]
Net asset value, beginning balance	[3]	$ 23.34		$ 84.86		$ 264.84
Net investment income (loss)		0.08		(0.07)	[3]	(1.10)	[3]
Net realized and unrealized gain (loss)	[1]	15.16		(61.45)	[3]	(178.88)	[3]
Change in net asset value from operations		15.24		(61.52)	[3]	(179.98)	[3]
Net asset value, ending balance		38.58		23.34	[3]	84.86	[3]
Market value per share, beginning balance	[2],[3]	23.15		85.04		266.60
Market value per share, ending balance	[2]	$ 38.61		$ 23.15	[3]	$ 85.04	[3]
Total Return, at net asset value		65.30%		(72.50%)	[3]	(68.00%)	[3]
Total Return, at market value		66.80%		(72.80%)	[3]	(68.10%)	[3]
Ratios to Average Net Assets
Expense ratio		1.00%		0.96%	[3]	0.99%	[3]
Expense ratio, excluding brokerage commissions		0.85%		0.85%	[3]	0.85%	[3]
Net investment income (loss)		0.30%		(0.18%)	[3]	(0.75%)	[3]
[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 NYSE Arca, which may be later than when the Funds' net asset is calculated.
[3]	See Note 1 of these Notes to Financial Statements.
[4]	Market values are determined at the close of the NYSE Arca, which may be later than when the Funds' net asset 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 of commencement of operations through December 31, 2017 are calculated based on the initial offering price upon commencement of operations of $25.00 and $100.00 respectively.
[5]	From commencement of operations, March 24, 2017 through December 31, 2017.
[6]	Percentages are not annualized for the period ended December 31, 2017.
[7]	Percentages are annualized.

Financial Highlights - Per Sh_2

Financial Highlights - Per Share Operating Performance (Parenthetical) (Detail)	Nov. 24, 2018$ / shares
Proshares UltraPro 3x Crude Oil ETF [Member]
Investment Company, Financial Highlights [Line Items]
Sale of stock, price per share	$ 25
ProShares UltraPro 3X Short Crude Oil ETF [Member]
Investment Company, Financial Highlights [Line Items]
Sale of stock, price per share	$ 100

Risk - Additional Information (

Risk - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018
Unusual Risk or Uncertainty [Line Items]
Inverse correlation, description	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 in amount, and possibly even direction from one-half the inverse (-0.5x), the inverse (-1x), two times the inverse (-2x), three times the inverse (-3x), one and one-half times (1.5x) the return, two times (2x) of the return or three times of the return (3x) of the Geared Fund's benchmark for the period.
Ultrashort Fund [Member]
Unusual Risk or Uncertainty [Line Items]
Leverage risk benchmark	50.00%
UltraPro Fund and UltraPro Short Fund [Member]
Unusual Risk or Uncertainty [Line Items]
Leverage risk benchmark	33.00%