ProShares Ultra Silver (AGQ) 10-K 2 Mar 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2014	Feb. 20, 2015	Jun. 30, 2014
Document Information [Line Items]
Document Type	10-K
Amendment Flag	FALSE
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Entity Registrant Name	ProShares Trust II
Entity Central Index Key	1415311
Current Fiscal Year End Date	-19
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		0
Entity Public Float			$0
ProShares Managed Futures Strategy [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		450,010
Entity Public Float			0
ProShares VIX Short-Term Futures ETF [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		4,949,812
Entity Public Float			98,476,672
ProShares VIX Mid-Term Futures ETF [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		412,404
Entity Public Float			40,608,827
ProShares Short VIX Short-Term Futures ETF [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		8,200,040
Entity Public Float			180,957,031
ProShares Ultra VIX Short-Term Futures ETF [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		23,920,099
Entity Public Float			296,017,035
ProShares UltraShort Bloomberg Commodity [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		59,997
Entity Public Float			3,119,844
ProShares UltraShort Bloomberg Crude Oil [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		4,119,944
Entity Public Float			362,257,822
Proshares UltraShort Bloomberg Natural Gas [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		124,951
Entity Public Float			49,524,809
ProShares UltraShort Gold [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		946,977
Entity Public Float			81,861,864
ProShares UltraShort Silver [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		558,488
Entity Public Float			51,046,632
ProShares Short Euro [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		400,005
Entity Public Float			14,264,178
ProShares UltraShort Australian Dollar [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		450,005
Entity Public Float			20,145,201
ProShares UltraShort Euro [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		20,400,014
Entity Public Float			439,890,239
ProShares UltraShort Yen [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		5,549,294
Entity Public Float			353,604,688
ProShares Ultra Bloomberg Commodity [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		200,014
Entity Public Float			4,404,308
ProShares Ultra Bloomberg Crude Oil [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		93,249,170
Entity Public Float			97,942,472
Proshares Ultra Bloomberg Natural Gas [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		5,969,941
Entity Public Float			21,156,744
ProShares Ultra Gold [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		2,500,014
Entity Public Float			138,348,692
ProShares Ultra Silver [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		7,596,533
Entity Public Float			512,835,208
ProShares Ultra Australian Dollar [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		100,005
Entity Public Float			3,565,178
ProShares Ultra Euro [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		300,014
Entity Public Float			2,580,361
ProShares Ultra Yen [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		400,014
Entity Public Float			$2,007,281

Statements_of_Financial_Condit

Statements of Financial Condition (USD $)	Dec. 31, 2014		Dec. 31, 2013
ProShares Managed Futures Strategy [Member]
Assets
Cash	$6,135,185	[1]
Segregated cash balances with brokers for futures contracts	195,142	[1]
Receivable on open futures contracts	17,445	[1]
Offering costs	49,384	[1]
Limitation by Sponsor	9,474	[1]
Total assets	6,406,630	[1]
Liabilities
Payable for offering costs	65,785	[1]
Total liabilities	65,785	[1]
Commitments and Contingencies		[1]
Shareholders' equity
Shareholders' equity	6,340,845	[1],[2]
Total liabilities and shareholders' equity	6,406,630	[1]
Shares outstanding	300,010	[1]
Net asset value per share	$21.14	[1]	$20
Market value per share	$21.28	[1]
ProShares VIX Short-Term Futures ETF [Member]
Assets
Cash	1,694,791		4,333,752
Segregated cash balances with brokers for futures contracts	18,439,750		64,020,350
Short-term U.S. government and agency obligations	82,088,299		207,636,383
Receivable on open futures contracts	9,317,236		3,179,017
Total assets	111,540,076		279,169,502
Liabilities
Payable for capital shares redeemed			8,562,195
Management fee payable	80,751		208,753
Total liabilities	80,751		8,770,948
Commitments and Contingencies
Shareholders' equity
Shareholders' equity	111,459,325		270,398,554
Total liabilities and shareholders' equity	111,540,076		279,169,502
Shares outstanding	5,324,812		9,474,812
Net asset value per share	$20.93		$28.54
Market value per share	$20.99		$28.53
ProShares VIX Mid-Term Futures ETF [Member]
Assets
Cash	1,634,082		1,906,397
Segregated cash balances with brokers for futures contracts	1,906,950		8,454,390
Short-term U.S. government and agency obligations	24,105,906		46,040,233
Receivable on open futures contracts	1,783,328		100,734
Total assets	29,430,266		56,501,754
Liabilities
Payable for capital shares redeemed	7,947,955		5,321,983
Management fee payable	22,736		45,448
Total liabilities	7,970,691		5,367,431
Commitments and Contingencies
Shareholders' equity
Shareholders' equity	21,459,575		51,134,323
Total liabilities and shareholders' equity	29,430,266		56,501,754
Shares outstanding	337,404		662,501
Net asset value per share	$63.60		$77.18
Market value per share	$63.89		$77.16
ProShares Short VIX Short-Term Futures ETF [Member]
Assets
Cash	9,122,219		2,153,370
Segregated cash balances with brokers for futures contracts	85,244,950		33,552,650
Short-term U.S. government and agency obligations	446,975,220		105,559,022
Receivable on open futures contracts			603,833
Total assets	541,342,389		141,868,875
Liabilities
Payable for capital shares redeemed	3,358,781
Payable on open futures contracts	31,020,019
Management fee payable	407,465		117,673
Total liabilities	34,786,265		117,673
Commitments and Contingencies
Shareholders' equity
Shareholders' equity	506,556,124		141,751,202
Total liabilities and shareholders' equity	541,342,389		141,868,875
Shares outstanding	8,250,040		2,100,040
Net asset value per share	$61.40		$67.50
Market value per share	$61.16		$67.47
ProShares Ultra VIX Short-Term Futures ETF [Member]
Assets
Cash	3,737,292		2,240,977
Segregated cash balances with brokers for futures contracts	116,907,700		107,101,750
Short-term U.S. government and agency obligations	182,639,188		109,533,487
Receivable from capital shares sold	12,549,248		10,903,664
Receivable on open futures contracts	42,531,441
Total assets	358,364,869		229,779,878
Liabilities
Payable for capital shares redeemed	6,272,056
Payable on open futures contracts			3,356,803
Management fee payable	302,860		189,491
Total liabilities	6,574,916		3,546,294
Commitments and Contingencies
Shareholders' equity
Shareholders' equity	351,789,953		226,233,584
Total liabilities and shareholders' equity	358,364,869		229,779,878
Shares outstanding	14,020,099		3,372,389
Net asset value per share	$25.09		$67.08
Market value per share	$25.15		$67.12
ProShares UltraShort Bloomberg Commodity [Member]
Assets
Cash	467,766		374,245
Short-term U.S. government and agency obligations	4,233,548		3,453,890
Unrealized appreciation on swap agreements	567,259
Total assets	5,268,573		3,828,135
Liabilities
Management fee payable	3,867		3,043
Unrealized depreciation on swap agreements			27,665
Total liabilities	3,867		30,708
Commitments and Contingencies
Shareholders' equity
Shareholders' equity	5,264,706		3,797,427
Total liabilities and shareholders' equity	5,268,573		3,828,135
Shares outstanding	59,997		59,997
Net asset value per share	$87.75		$63.29
Market value per share	$87.44		$58.41
ProShares UltraShort Bloomberg Crude Oil [Member]
Assets
Cash	994,268		1,872,915
Segregated cash balances with brokers for futures contracts	12,292,665		7,633,395
Short-term U.S. government and agency obligations	131,594,608		247,584,623
Unrealized appreciation on swap agreements	27,018,077
Receivable on open futures contracts	1,293,531		1,503,943
Total assets	173,193,149		258,594,876
Liabilities
Payable for capital shares redeemed	3,854,654
Management fee payable	128,385		201,827
Unrealized depreciation on swap agreements			2,332,900
Total liabilities	3,983,039		2,534,727
Commitments and Contingencies
Shareholders' equity
Shareholders' equity	169,210,110		256,060,149
Total liabilities and shareholders' equity	173,193,149		258,594,876
Shares outstanding	2,169,944		8,069,944
Net asset value per share	$77.98		$31.73
Market value per share	$76.52		$31.58
Proshares UltraShort Bloomberg Natural Gas [Member]
Assets
Cash	696,743		564,647
Segregated cash balances with brokers for futures contracts	4,405,830		2,384,800
Short-term U.S. government and agency obligations	8,672,710		18,274,713
Receivable on open futures contracts	923,531		1,520,548
Total assets	14,698,814		22,744,708
Liabilities
Management fee payable	10,250		9,941
Total liabilities	10,250		9,941
Commitments and Contingencies
Shareholders' equity
Shareholders' equity	14,688,564		22,734,767
Total liabilities and shareholders' equity	14,698,814		22,744,708
Shares outstanding	174,952		324,952
Net asset value per share	$83.96		$69.96
Market value per share	$82.03		$69.36
ProShares UltraShort Gold [Member]
Assets
Cash	162,434		197,647
Segregated cash balances with brokers for futures contracts	8,800		15,950
Short-term U.S. government and agency obligations	84,040,107		148,988,329
Unrealized appreciation on forward agreements			5,633,053
Receivable on open futures contracts	3,260		300
Total assets	84,214,601		154,835,279
Liabilities
Payable for capital shares redeemed			15,275,004
Management fee payable	70,061		123,819
Unrealized depreciation on forward agreements	2,282,778
Total liabilities	2,352,839		15,398,823
Commitments and Contingencies
Shareholders' equity
Shareholders' equity	81,861,762		139,436,456
Total liabilities and shareholders' equity	84,214,601		154,835,279
Shares outstanding	846,978		1,346,978
Net asset value per share	$96.65		$103.52
Market value per share	$100.22		$103.53
ProShares Ultra Silver [Member]
Assets
Cash	305,004		463,001
Segregated cash balances with brokers for futures contracts	14,300		22,000
Short-term U.S. government and agency obligations	305,474,211		467,868,976
Total assets	305,793,515		468,353,977
Liabilities
Payable for capital shares redeemed	1,967,832
Payable on open futures contracts	6,770		2,450
Management fee payable	254,050		379,128
Unrealized depreciation on forward agreements	12,395,120		2,492,880
Total liabilities	14,623,772		2,874,458
Commitments and Contingencies
Shareholders' equity
Shareholders' equity	291,169,743		465,479,519
Total liabilities and shareholders' equity	305,793,515		468,353,977
Shares outstanding	7,396,533		7,350,007
Net asset value per share	$39.37		$63.33
Market value per share	$38.05		$63.04
ProShares Short Euro [Member]
Assets
Cash	1,640,225		863,980
Segregated cash balances with brokers for futures contracts	242,880		128,700
Short-term U.S. government and agency obligations	12,086,577		7,902,056
Receivable on open futures contracts	63,250		9,100
Total assets	14,032,932		8,903,836
Liabilities
Management fee payable	11,128		6,994
Total liabilities	11,128		6,994
Commitments and Contingencies
Shareholders' equity
Shareholders' equity	14,021,804		8,896,842
Total liabilities and shareholders' equity	14,032,932		8,903,836
Shares outstanding	350,005		250,005
Net asset value per share	$40.06		$35.59
Market value per share	$40.03		$35.66
ProShares UltraShort Australian Dollar [Member]
Assets
Cash	1,788,757		2,751,320
Segregated cash balances with brokers for futures contracts	1,020,217		1,141,635
Short-term U.S. government and agency obligations	20,267,679		24,198,507
Receivable on open futures contracts	62,534
Total assets	23,139,187		28,091,462
Liabilities
Payable on open futures contracts			86,166
Management fee payable	18,397		22,017
Total liabilities	18,397		108,183
Commitments and Contingencies
Shareholders' equity
Shareholders' equity	23,120,790		27,983,279
Total liabilities and shareholders' equity	23,139,187		28,091,462
Shares outstanding	450,005		600,005
Net asset value per share	$51.38		$46.64
Market value per share	$51.37		$46.66
ProShares UltraShort Euro [Member]
Assets
Cash	746,454		218,940
Short-term U.S. government and agency obligations	487,111,117		437,847,159
Unrealized appreciation on foreign currency forward contracts	19,019,765		151,351
Receivable from capital shares sold	12,956,604
Total assets	519,833,940		438,217,450
Liabilities
Payable for capital shares redeemed			5,971,084
Management fee payable	385,820		345,393
Unrealized depreciation on foreign currency forward contracts	2,256,771		13,899,858
Total liabilities	2,642,591		20,216,335
Commitments and Contingencies
Shareholders' equity
Shareholders' equity	517,191,349		418,001,115
Total liabilities and shareholders' equity	519,833,940		438,217,450
Shares outstanding	23,950,014		24,500,014
Net asset value per share	$21.59		$17.06
Market value per share	$21.61		$17.06
ProShares UltraShort Yen [Member]
Assets
Cash	532,706		575,108
Short-term U.S. government and agency obligations	532,957,746		558,597,264
Unrealized appreciation on foreign currency forward contracts	571,149		31,317,568
Total assets	534,061,601		590,489,940
Liabilities
Management fee payable	439,804		437,540
Unrealized depreciation on foreign currency forward contracts	2,149,924		1,930,884
Total liabilities	2,589,728		2,368,424
Commitments and Contingencies
Shareholders' equity
Shareholders' equity	531,471,873		588,121,516
Total liabilities and shareholders' equity	534,061,601		590,489,940
Shares outstanding	5,949,294		8,299,294
Net asset value per share	$89.33		$70.86
Market value per share	$89.30		$70.91
ProShares Ultra Bloomberg Commodity [Member]
Assets
Cash	185,684		85,642
Short-term U.S. government and agency obligations	2,754,900		2,816,688
Unrealized appreciation on swap agreements			15,078
Total assets	2,940,584		2,917,408
Liabilities
Management fee payable	2,326		2,374
Unrealized depreciation on swap agreements	331,338
Total liabilities	333,664		2,374
Commitments and Contingencies
Shareholders' equity
Shareholders' equity	2,606,920		2,915,034
Total liabilities and shareholders' equity	2,940,584		2,917,408
Shares outstanding	200,014		150,014
Net asset value per share	$13.03		$19.43
Market value per share	$12.86		$19.13
ProShares Ultra Bloomberg Crude Oil [Member]
Assets
Cash	2,349,384		689,596
Segregated cash balances with brokers for futures contracts	34,605,120		3,821,895
Short-term U.S. government and agency obligations	467,200,736		137,435,610
Unrealized appreciation on swap agreements			1,957,893
Receivable from capital shares sold	28,726,173
Total assets	532,881,413		143,904,994
Liabilities
Payable on open futures contracts	5,817,266		997,210
Management fee payable	320,062		134,355
Unrealized depreciation on swap agreements	76,181,097
Total liabilities	82,318,425		1,131,565
Commitments and Contingencies
Shareholders' equity
Shareholders' equity	450,562,988		142,773,429
Total liabilities and shareholders' equity	532,881,413		143,904,994
Shares outstanding	44,399,170		4,449,170
Net asset value per share	$10.15		$32.09
Market value per share	$10.37		$32.22
Proshares Ultra Bloomberg Natural Gas [Member]
Assets
Cash	1,653,582		3,102,827
Segregated cash balances with brokers for futures contracts	21,134,080		6,602,200
Short-term U.S. government and agency obligations	53,410,227		58,921,011
Receivable from capital shares sold	3,853,422
Total assets	80,051,311		68,626,038
Liabilities
Payable on open futures contracts	9,552,314		5,628,532
Management fee payable	65,790		81,727
Total liabilities	9,618,104		5,710,259
Commitments and Contingencies
Shareholders' equity
Shareholders' equity	70,433,207		62,915,779
Total liabilities and shareholders' equity	80,051,311		68,626,038
Shares outstanding	4,569,941		1,619,941
Net asset value per share	$15.41		$38.84
Market value per share	$15.78		$39.28
ProShares Ultra Gold [Member]
Assets
Cash	104,145		142,566
Segregated cash balances with brokers for futures contracts	8,800		15,950
Short-term U.S. government and agency obligations	101,927,857		140,880,950
Unrealized appreciation on forward agreements	2,051,154
Total assets	104,091,956		141,039,466
Liabilities
Payable for capital shares redeemed	1,999,718		2,097,225
Payable on open futures contracts	3,260		300
Management fee payable	85,633		111,562
Unrealized depreciation on forward agreements			6,812,974
Total liabilities	2,088,611		9,022,061
Commitments and Contingencies
Shareholders' equity
Shareholders' equity	102,003,345		132,017,405
Total liabilities and shareholders' equity	104,091,956		141,039,466
Shares outstanding	2,550,014		3,200,014
Net asset value per share	$40.00		$41.26
Market value per share	$38.41		$41.26
ProShares UltraShort Silver [Member]
Assets
Cash	207,506		461,167
Segregated cash balances with brokers for futures contracts	14,300		22,000
Short-term U.S. government and agency obligations	52,226,692		114,826,066
Unrealized appreciation on forward agreements	799,523
Receivable on open futures contracts	6,770		2,450
Total assets	53,254,791		115,311,683
Liabilities
Management fee payable	42,354		94,140
Unrealized depreciation on forward agreements	204,570		2,227,857
Total liabilities	246,924		2,321,997
Commitments and Contingencies
Shareholders' equity
Shareholders' equity	53,007,867		112,989,686
Total liabilities and shareholders' equity	53,254,791		115,311,683
Shares outstanding	458,489		1,258,489
Net asset value per share	$115.61		$89.78
Market value per share	$119.39		$90.19
ProShares Ultra Australian Dollar [Member]
Assets
Cash	222,968		314,796
Segregated cash balances with brokers for futures contracts	120,131		128,865
Short-term U.S. government and agency obligations	2,405,685		2,716,439
Receivable on open futures contracts			10,650
Total assets	2,748,784		3,170,750
Liabilities
Payable on open futures contracts	6,369
Management fee payable	2,248		2,585
Total liabilities	8,617		2,585
Commitments and Contingencies
Shareholders' equity
Shareholders' equity	2,740,167		3,168,165
Total liabilities and shareholders' equity	2,748,784		3,170,750
Shares outstanding	100,005		100,005
Net asset value per share	$27.40		$31.68
Market value per share	$27.43		$31.61
ProShares Ultra Euro [Member]
Assets
Cash	671,117		49,723
Short-term U.S. government and agency obligations	2,415,698		2,455,863
Unrealized appreciation on foreign currency forward contracts	2,921		120,908
Total assets	3,089,736		2,626,494
Liabilities
Management fee payable	2,003		2,721
Unrealized depreciation on foreign currency forward contracts	106,292		19,946
Total liabilities	108,295		22,667
Commitments and Contingencies
Shareholders' equity
Shareholders' equity	2,981,441		2,603,827
Total liabilities and shareholders' equity	3,089,736		2,626,494
Shares outstanding	150,014		100,014
Net asset value per share	$19.87		$26.03
Market value per share	$19.80		$25.98
ProShares Ultra Yen [Member]
Assets
Cash	846,919		28,116
Short-term U.S. government and agency obligations	1,287,869		2,928,556
Unrealized appreciation on foreign currency forward contracts	404		4,052
Total assets	2,135,192		2,960,724
Liabilities
Management fee payable	1,515		2,337
Unrealized depreciation on foreign currency forward contracts	15,649		163,361
Total liabilities	17,164		165,698
Commitments and Contingencies
Shareholders' equity
Shareholders' equity	2,118,028		2,795,026
Total liabilities and shareholders' equity	2,135,192		2,960,724
Shares outstanding	150,014		150,014
Net asset value per share	$14.12		$18.63
Market value per share	$14.12		$18.61
ProShares Trust II [Member]
Assets
Cash	35,899,231		23,390,732
Segregated cash balances with brokers for futures contracts	296,561,615		235,046,530
Short-term U.S. government and agency obligations	3,005,876,580		2,846,465,825
Unrealized appreciation on swap agreements	27,585,336		1,972,971
Unrealized appreciation on forward agreements	2,850,677		5,633,053
Unrealized appreciation on foreign currency forward contracts	19,594,239		31,593,879
Receivable from capital shares sold	58,085,447		10,903,664
Receivable on open futures contracts	56,002,326		6,930,575
Offering costs	49,384
Limitation by Sponsor	9,474
Total assets	3,502,514,309		3,161,937,229
Liabilities
Payable for capital shares redeemed	25,400,996		37,227,491
Payable on open futures contracts	46,405,998		10,071,461
Management fee payable	2,657,505		2,522,868
Payable for offering costs	65,785
Unrealized depreciation on swap agreements	76,512,435		2,360,565
Unrealized depreciation on forward agreements	14,882,468		11,533,711
Unrealized depreciation on foreign currency forward contracts	4,528,636		16,014,049
Total liabilities	170,453,823		79,730,145
Commitments and Contingencies
Shareholders' equity
Shareholders' equity	3,332,060,486		3,082,207,084
Total liabilities and shareholders' equity	$3,502,514,309		$3,161,937,229
Shares outstanding	122,157,748		77,438,599
[1]	Since the Fund commenced investment operations on October 1, 2014, the Statement of Financial Condition as of December 31, 2013 has not been provided.
[2]	Since the Fund commenced investment operations on October 1, 2014, the Statements of Changes in Shareholders' Equity for the years ended December 31, 2013 and 2012 have not been provided.

Statements_of_Operations

Statements of Operations (USD $)	3 Months Ended		12 Months Ended			6 Months Ended
	Dec. 31, 2014		Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2012
ProShares Managed Futures Strategy [Member]
Expenses
Brokerage commissions	$604	[1]
Offering costs	16,401	[1]
Limitation by Sponsor	-9,474	[1]
Total expenses	7,531	[1]
Net investment income (loss)	-7,531	[1],[2]
Net realized gain (loss) on
Futures contracts	109,006	[1]
Net realized gain (loss)	109,006	[1],[2]
Change in net unrealized appreciation/depreciation on
Futures contracts	104,327	[1]
Change in net unrealized appreciation/depreciation	104,327	[1],[2]
Net realized and unrealized gain (loss)	213,333	[1]
Net income (loss)	205,802	[1],[2]
Net income (loss) per weighted-average share	$1.14	[1]
Weighted-average shares outstanding	180,779	[1]
ProShares VIX Short-Term Futures ETF [Member]
Investment Income
Interest			47,562	77,010	77,462
Expenses
Management fee			1,083,189	1,661,129	1,129,484
Brokerage commissions			82,921
Offering costs					1,090
Total expenses			1,166,110	1,661,129	1,130,574
Net investment income (loss)			-1,118,548	-1,584,119	-1,053,112
Net realized gain (loss) on
Futures contracts			-694,347	-144,618,136	-160,953,587
Short-term U.S. government and agency obligations			12,242	-6,516	5,730
Net realized gain (loss)			-682,105	-144,624,652	-160,947,857
Change in net unrealized appreciation/depreciation on
Futures contracts			22,917,306	-16,431,267	1,354,551
Short-term U.S. government and agency obligations			-6,229	4,439	4,586
Change in net unrealized appreciation/depreciation			22,911,077	-16,426,828	1,359,137
Net realized and unrealized gain (loss)			22,228,972	-161,051,480	-159,588,720
Net income (loss)			21,110,424	-162,635,599	-160,641,832
Net income (loss) per weighted-average share			$3.86	($36.12)	($156.90)
Weighted-average shares outstanding			5,463,511	4,503,256	1,023,881
ProShares VIX Mid-Term Futures ETF [Member]
Investment Income
Interest			16,573	25,811	49,908
Expenses
Management fee			392,120	572,377	835,393
Brokerage commissions			10,931
Offering costs					682
Total expenses			403,051	572,377	836,075
Net investment income (loss)			-386,478	-546,566	-786,167
Net realized gain (loss) on
Futures contracts			-14,378,810	-28,219,863	-75,241,919
Short-term U.S. government and agency obligations			1,742	-78	47
Net realized gain (loss)			-14,377,068	-28,219,941	-75,241,872
Change in net unrealized appreciation/depreciation on
Futures contracts			5,157,354	-3,426,279	4,642,340
Short-term U.S. government and agency obligations			187	-2,031	8,950
Change in net unrealized appreciation/depreciation			5,157,541	-3,428,310	4,651,290
Net realized and unrealized gain (loss)			-9,219,527	-31,648,251	-70,590,582
Net income (loss)			-9,606,005	-32,194,817	-71,376,749
Net income (loss) per weighted-average share			($14.08)	($46.49)	($147.08)
Weighted-average shares outstanding			682,131	692,570	485,299
ProShares Short VIX Short-Term Futures ETF [Member]
Investment Income
Interest			81,544	36,503	18,261
Expenses
Management fee			2,785,597	845,479	196,650
Brokerage commissions			1,581,416	519,393	189,549
Offering costs					69,761
Total expenses			4,367,013	1,364,872	455,960
Net investment income (loss)			-4,285,469	-1,328,369	-437,699
Net realized gain (loss) on
Futures contracts			76,925,998	87,175,105	13,203,419
Short-term U.S. government and agency obligations			19,363	6,005	2,652
Net realized gain (loss)			76,945,361	87,181,110	13,206,071
Change in net unrealized appreciation/depreciation on
Futures contracts			-24,469,104	9,504,130	-1,477,355
Short-term U.S. government and agency obligations			-1,764	1,795	2,552
Change in net unrealized appreciation/depreciation			-24,470,868	9,505,925	-1,474,803
Net realized and unrealized gain (loss)			52,474,493	96,687,035	11,731,268
Net income (loss)			48,189,024	95,358,666	11,293,569
Net income (loss) per weighted-average share			$11.52	$53.11	$10.81
Weighted-average shares outstanding			4,182,232	1,795,656	1,044,576
ProShares Ultra VIX Short-Term Futures ETF [Member]
Investment Income
Interest			72,700	70,016	61,217
Expenses
Management fee			2,868,337	2,555,345	1,579,190
Brokerage commissions			2,563,849	2,343,432	1,413,912
Offering costs					69,761
Total expenses			5,432,186	4,898,777	3,062,863
Net investment income (loss)			-5,359,486	-4,828,761	-3,001,646
Net realized gain (loss) on
Futures contracts			-139,412,525	-401,363,569	-488,564,265
Swap agreements				-4,453,107	-20,857,599
Short-term U.S. government and agency obligations			9,921	18,730	20,334
Net realized gain (loss)			-139,402,604	-405,797,946	-509,401,530
Change in net unrealized appreciation/depreciation on
Futures contracts			63,595,164	-26,066,973	2,819,852
Swap agreements				-301,351	301,351
Short-term U.S. government and agency obligations			-4,701	7,062	-4,436
Change in net unrealized appreciation/depreciation			63,590,463	-26,361,262	3,116,767
Net realized and unrealized gain (loss)			-75,812,141	-432,159,208	-506,284,763
Net income (loss)			-81,171,627	-436,987,969	-509,286,409
Net income (loss) per weighted-average share			($8.80)	($271.58)	($6,520.87)
Weighted-average shares outstanding			9,223,127	1,609,086	78,101
ProShares UltraShort Bloomberg Commodity [Member]
Investment Income
Interest			1,232	1,899	3,017
Expenses
Management fee			35,302	34,029	50,766
Total expenses			35,302	34,029	50,766
Net investment income (loss)			-34,070	-32,130	-47,749
Net realized gain (loss) on
Swap agreements			906,309	760,002	761,879
Short-term U.S. government and agency obligations			3	24	62
Net realized gain (loss)			906,312	760,026	761,941
Change in net unrealized appreciation/depreciation on
Swap agreements			594,924	-176,167	-422,249
Short-term U.S. government and agency obligations			113	-267	520
Change in net unrealized appreciation/depreciation			595,037	-176,434	-421,729
Net realized and unrealized gain (loss)			1,501,349	583,592	340,212
Net income (loss)			1,467,279	551,462	292,463
Net income (loss) per weighted-average share			$24.46	$9.19	$3
Weighted-average shares outstanding			59,997	59,997	97,565
ProShares UltraShort Bloomberg Crude Oil [Member]
Investment Income
Interest			110,620	113,487	75,194
Expenses
Management fee			2,448,428	2,581,084	1,121,597
Brokerage commissions			78,033	77,031	32,261
Total expenses			2,526,461	2,658,115	1,153,858
Net investment income (loss)			-2,415,841	-2,544,628	-1,078,664
Net realized gain (loss) on
Futures contracts			44,472,509	-4,299,671	16,109,009
Swap agreements			54,854,588	-8,005,328	31,455,754
Short-term U.S. government and agency obligations			20,701	5,188	5,203
Net realized gain (loss)			99,347,798	-12,299,811	47,569,966
Change in net unrealized appreciation/depreciation on
Futures contracts			17,039,376	2,796,948	-4,276,761
Swap agreements			29,350,977	3,274,160	-8,252,300
Short-term U.S. government and agency obligations			-8,704	6,876	6,720
Change in net unrealized appreciation/depreciation			46,381,649	6,077,984	-12,522,341
Net realized and unrealized gain (loss)			145,729,447	-6,221,827	35,047,625
Net income (loss)			143,313,606	-8,766,455	33,968,961
Net income (loss) per weighted-average share			$16.45	($1.05)	$11.32
Weighted-average shares outstanding			8,711,177	8,388,848	3,000,545
Proshares UltraShort Bloomberg Natural Gas [Member]
Investment Income
Interest			16,306	8,620	7,994
Expenses
Management fee			385,014	172,542	76,306
Brokerage commissions			92,199	45,438	64,176
Offering costs					63,919
Total expenses			477,213	217,980	204,401
Net investment income (loss)			-460,907	-209,360	-196,407
Net realized gain (loss) on
Futures contracts			8,791,719	-2,585,514	1,212,600
Short-term U.S. government and agency obligations			5,163	619	395
Net realized gain (loss)			8,796,882	-2,584,895	1,212,995
Change in net unrealized appreciation/depreciation on
Futures contracts			2,899,165	633,165	-971,875
Short-term U.S. government and agency obligations			72	-422	744
Change in net unrealized appreciation/depreciation			2,899,237	632,743	-971,131
Net realized and unrealized gain (loss)			11,696,119	-1,952,152	241,864
Net income (loss)			11,235,212	-2,161,512	45,457
Net income (loss) per weighted-average share			$12.09	($9.52)	$0.36
Weighted-average shares outstanding			929,061	227,135	126,135
ProShares UltraShort Gold [Member]
Investment Income
Interest			40,675	61,891	76,519
Expenses
Management fee			898,453	1,237,712	1,182,691
Brokerage commissions			39	39	41
Total expenses			898,492	1,237,751	1,182,732
Net investment income (loss)			-857,817	-1,175,860	-1,106,213
Net realized gain (loss) on
Futures contracts			23,310	97,060	7,600
Forward agreements			-5,339,792	61,027,349	-10,075,098
Short-term U.S. government and agency obligations			3,873	-1,351	1,849
Net realized gain (loss)			-5,312,609	61,123,058	-10,065,649
Change in net unrealized appreciation/depreciation on
Futures contracts			-19,040	-720	-26,560
Forward agreements			-7,915,831	1,903,197	-29,671,502
Short-term U.S. government and agency obligations			868	-1,136	5,325
Change in net unrealized appreciation/depreciation			-7,934,003	1,901,341	-29,692,737
Net realized and unrealized gain (loss)			-13,246,612	63,024,399	-39,758,386
Net income (loss)			-14,104,429	61,848,539	-40,864,599
Net income (loss) per weighted-average share			($13.54)	$39.77	($21.80)
Weighted-average shares outstanding			1,041,909	1,555,197	1,874,767
ProShares Ultra Silver [Member]
Investment Income
Interest			179,642	348,317	520,233
Expenses
Management fee			4,148,207	5,628,988	7,438,345
Brokerage commissions			43	36	45
Total expenses			4,148,250	5,629,024	7,438,390
Net investment income (loss)			-3,968,608	-5,280,707	-6,918,157
Net realized gain (loss) on
Futures contracts			-52,451	-137,594	-6,160
Forward agreements			-155,498,969	-701,395,135	-66,420,332
Short-term U.S. government and agency obligations			8,226	14,261	5,369
Net realized gain (loss)			-155,543,194	-701,518,468	-66,421,123
Change in net unrealized appreciation/depreciation on
Futures contracts			12,640	25,820	20,830
Forward agreements			-9,902,240	143,247,826	33,586,067
Short-term U.S. government and agency obligations			-11,363	-30,955	61,788
Change in net unrealized appreciation/depreciation			-9,900,963	143,242,691	33,668,685
Net realized and unrealized gain (loss)			-165,444,157	-558,275,777	-32,752,438
Net income (loss)			-169,412,765	-563,556,484	-39,670,595
Net income (loss) per weighted-average share			($22.83)	($93.80)	($9.91)
Weighted-average shares outstanding			7,420,839	6,008,363	4,001,407
ProShares Short Euro [Member]
Investment Income
Interest			4,716	1,996		1,508
Expenses
Management fee			121,126	35,075
Brokerage commissions			1,837	812		313
Offering costs				45,511		21,231
Limitation by Sponsor				-28,232		-2,145
Total expenses			122,963	53,166		19,399
Net investment income (loss)			-118,247	-51,170		-17,891
Net realized gain (loss) on
Futures contracts			1,593,048	-381,987		-164,400
Short-term U.S. government and agency obligations			402	157		-1
Net realized gain (loss)			1,593,450	-381,830		-164,401
Change in net unrealized appreciation/depreciation on
Futures contracts			418,562	21,825		-55,056
Short-term U.S. government and agency obligations			-472	463		188
Change in net unrealized appreciation/depreciation			418,090	22,288		-54,868
Net realized and unrealized gain (loss)			2,011,540	-359,542		-219,269
Net income (loss)			1,893,293	-410,712		-237,160
Net income (loss) per weighted-average share			$5.49	($2.75)		($2.38)
Weighted-average shares outstanding			344,937	149,183		99,476
ProShares UltraShort Australian Dollar [Member]
Investment Income
Interest			8,225	5,653			1,432
Expenses
Management fee			208,597	106,713
Brokerage commissions			12,811	11,753			1,006
Offering costs				47,870			18,871
Limitation by Sponsor				-1,259			-2,216
Total expenses			221,408	165,077			17,661
Net investment income (loss)			-213,183	-159,424			-16,229
Net realized gain (loss) on
Futures contracts			2,296,216	2,720,079			-288,740
Short-term U.S. government and agency obligations			492	-74			-4
Net realized gain (loss)			2,296,708	2,720,005			-288,744
Change in net unrealized appreciation/depreciation on
Futures contracts			-174,124	832,015			85,590
Short-term U.S. government and agency obligations			-1,463	1,279			182
Change in net unrealized appreciation/depreciation			-175,587	833,294			85,772
Net realized and unrealized gain (loss)			2,121,121	3,553,299			-202,972
Net income (loss)			1,907,938	3,393,875			-219,201
Net income (loss) per weighted-average share			$3.82	$9.21			($2.21)
Weighted-average shares outstanding			499,046	368,635			99,410
ProShares UltraShort Euro [Member]
Investment Income
Interest			199,596	224,967	525,386
Expenses
Management fee			4,193,741	4,600,479	7,972,894
Total expenses			4,193,741	4,600,479	7,972,894
Net investment income (loss)			-3,994,145	-4,375,512	-7,447,508
Net realized gain (loss) on
Foreign currency forward contracts			83,678,955	-48,063,036	46,946,419
Short-term U.S. government and agency obligations			4,637	7,153	8,121
Net realized gain (loss)			83,683,592	-48,055,883	46,954,540
Change in net unrealized appreciation/depreciation on
Foreign currency forward contracts			30,511,501	-600,935	-80,578,526
Short-term U.S. government and agency obligations			-12,286	12,268	37,347
Change in net unrealized appreciation/depreciation			30,499,215	-588,667	-80,541,179
Net realized and unrealized gain (loss)			114,182,807	-48,644,550	-33,586,639
Net income (loss)			110,188,662	-53,020,062	-41,034,147
Net income (loss) per weighted-average share			$4.53	($2.03)	($0.99)
Weighted-average shares outstanding			24,321,384	26,095,630	41,293,047
ProShares UltraShort Yen [Member]
Investment Income
Interest			197,253	209,601	170,226
Expenses
Management fee			3,938,854	4,607,832	2,354,920
Total expenses			3,938,854	4,607,832	2,354,920
Net investment income (loss)			-3,741,601	-4,398,231	-2,184,694
Net realized gain (loss) on
Foreign currency forward contracts			127,846,225	164,019,598	27,341,631
Short-term U.S. government and agency obligations			13,833	4,527	976
Net realized gain (loss)			127,860,058	164,024,125	27,342,607
Change in net unrealized appreciation/depreciation on
Foreign currency forward contracts			-30,965,459	-8,727,491	42,478,321
Short-term U.S. government and agency obligations			-20,893	22,835	14,768
Change in net unrealized appreciation/depreciation			-30,986,352	-8,704,656	42,493,089
Net realized and unrealized gain (loss)			96,873,706	155,319,469	69,835,696
Net income (loss)			93,132,105	150,921,238	67,651,002
Net income (loss) per weighted-average share			$15.96	$19.43	$11.91
Weighted-average shares outstanding			5,835,184	7,767,376	5,679,622
ProShares Ultra Bloomberg Commodity [Member]
Investment Income
Interest			1,330	2,066	4,965
Expenses
Management fee			32,321	40,543	78,449
Total expenses			32,321	40,543	78,449
Net investment income (loss)			-30,991	-38,477	-73,484
Net realized gain (loss) on
Swap agreements			-1,065,622	-1,254,251	-536,107
Short-term U.S. government and agency obligations			43	-44
Net realized gain (loss)			-1,065,579	-1,254,295	-536,107
Change in net unrealized appreciation/depreciation on
Swap agreements			-346,416	321,346	400,909
Short-term U.S. government and agency obligations			-44	-72	404
Change in net unrealized appreciation/depreciation			-346,460	321,274	401,313
Net realized and unrealized gain (loss)			-1,412,039	-933,021	-134,794
Net income (loss)			-1,443,030	-971,498	-208,278
Net income (loss) per weighted-average share			($8.20)	($4.91)	($0.65)
Weighted-average shares outstanding			175,904	197,822	320,779
ProShares Ultra Bloomberg Crude Oil [Member]
Investment Income
Interest			68,292	135,291	240,162
Expenses
Management fee			1,769,248	2,275,701	3,400,756
Brokerage commissions			65,408	55,871	87,836
Total expenses			1,834,656	2,331,572	3,488,592
Net investment income (loss)			-1,766,364	-2,196,281	-3,248,430
Net realized gain (loss) on
Futures contracts			-109,160,069	52,686,859	-28,210,259
Swap agreements			-134,165,888	68,059,089	-55,851,708
Short-term U.S. government and agency obligations			11,806	11,289	12,852
Net realized gain (loss)			-243,314,151	120,757,237	-84,049,115
Change in net unrealized appreciation/depreciation on
Futures contracts			-47,101,448	-21,333,749	23,325,740
Swap agreements			-78,138,990	-31,375,727	43,341,016
Short-term U.S. government and agency obligations			-7,333	-5,591	24,546
Change in net unrealized appreciation/depreciation			-125,247,771	-52,715,067	66,691,302
Net realized and unrealized gain (loss)			-368,561,922	68,042,170	-17,357,813
Net income (loss)			-370,328,286	65,845,889	-20,606,243
Net income (loss) per weighted-average share			($45.82)	$8.54	($1.84)
Weighted-average shares outstanding			8,081,910	7,709,992	11,187,012
Proshares Ultra Bloomberg Natural Gas [Member]
Investment Income
Interest			15,961	33,341	30,397
Expenses
Management fee			455,794	707,598	404,318
Brokerage commissions			88,748	147,433	128,470
Offering costs					63,919
Total expenses			544,542	855,031	596,707
Net investment income (loss)			-528,581	-821,690	-566,310
Net realized gain (loss) on
Futures contracts			-6,464,796	41,418,165	-2,839,309
Short-term U.S. government and agency obligations			5,068	4,691	4,126
Net realized gain (loss)			-6,459,728	41,422,856	-2,835,183
Change in net unrealized appreciation/depreciation on
Futures contracts			-31,232,744	160,411	-2,991,440
Short-term U.S. government and agency obligations			-1,537	2,133	783
Change in net unrealized appreciation/depreciation			-31,234,281	162,544	-2,990,657
Net realized and unrealized gain (loss)			-37,694,009	41,585,400	-5,825,840
Net income (loss)			-38,222,590	40,763,710	-6,392,150
Net income (loss) per weighted-average share			($27.42)	$20.11	($5.88)
Weighted-average shares outstanding			1,394,051	2,027,064	1,088,025
ProShares Ultra Gold [Member]
Investment Income
Interest			54,755	130,437	242,432
Expenses
Management fee			1,212,064	2,055,613	3,411,655
Brokerage commissions			39	39	42
Total expenses			1,212,103	2,055,652	3,411,697
Net investment income (loss)			-1,157,348	-1,925,215	-3,169,265
Net realized gain (loss) on
Futures contracts			-23,260	-97,160	-7,480
Forward agreements			-9,651,073	-165,535,626	-33,585,416
Short-term U.S. government and agency obligations			1,361	7,780	3,264
Net realized gain (loss)			-9,672,972	-165,625,006	-33,589,632
Change in net unrealized appreciation/depreciation on
Futures contracts			19,140	680	26,420
Forward agreements			8,864,128	8,839,084	65,184,222
Short-term U.S. government and agency obligations			5,375	-19,303	20,736
Change in net unrealized appreciation/depreciation			8,888,643	8,820,461	65,231,378
Net realized and unrealized gain (loss)			-784,329	-156,804,545	31,641,746
Net income (loss)			-1,941,677	-158,729,760	28,472,481
Net income (loss) per weighted-average share			($0.68)	($44.55)	$6.90
Weighted-average shares outstanding			2,838,096	3,562,617	4,126,517
ProShares UltraShort Silver [Member]
Investment Income
Interest			30,901	60,178	100,092
Expenses
Management fee			616,703	1,033,442	1,503,193
Brokerage commissions			39	40	41
Total expenses			616,742	1,033,482	1,503,234
Net investment income (loss)			-585,841	-973,304	-1,403,142
Net realized gain (loss) on
Futures contracts			32,275	137,040	960
Forward agreements			15,082,608	113,319,364	-28,115,932
Short-term U.S. government and agency obligations			4,234	6,916	5,567
Net realized gain (loss)			15,119,117	113,463,320	-28,109,405
Change in net unrealized appreciation/depreciation on
Futures contracts			-12,640	-25,820	-20,830
Forward agreements			2,822,810	-21,535,542	-23,708,038
Short-term U.S. government and agency obligations			-2,414	-3,439	12,171
Change in net unrealized appreciation/depreciation			2,807,756	-21,564,801	-23,716,697
Net realized and unrealized gain (loss)			17,926,873	91,898,519	-51,826,102
Net income (loss)			17,341,032	90,925,215	-53,229,244
Net income (loss) per weighted-average share			$23.31	$58.14	($18.23)
Weighted-average shares outstanding			743,968	1,563,968	2,919,786
ProShares Ultra Australian Dollar [Member]
Investment Income
Interest			1,717	1,570			1,493
Expenses
Management fee			31,317	14,696
Brokerage commissions			1,513	1,545			932
Offering costs				47,870			18,871
Limitation by Sponsor				-27,636			-1,012
Total expenses			32,830	36,475			18,791
Net investment income (loss)			-31,113	-34,905			-17,298
Net realized gain (loss) on
Futures contracts			-417,873	-928,022			265,990
Short-term U.S. government and agency obligations			3	8			-1
Net realized gain (loss)			-417,870	-928,014			265,989
Change in net unrealized appreciation/depreciation on
Futures contracts			21,395	-19,190			-99,030
Short-term U.S. government and agency obligations			-410	206			207
Change in net unrealized appreciation/depreciation			20,985	-18,984			-98,823
Net realized and unrealized gain (loss)			-396,885	-946,998			167,166
Net income (loss)			-427,998	-981,903			149,868
Net income (loss) per weighted-average share			($4.28)	($9.82)			$1.51
Weighted-average shares outstanding			100,005	100,005			99,410
ProShares Ultra Euro [Member]
Investment Income
Interest			1,083	1,901	3,690
Expenses
Management fee			23,330	36,925	63,816
Total expenses			23,330	36,925	63,816
Net investment income (loss)			-22,247	-35,024	-60,126
Net realized gain (loss) on
Foreign currency forward contracts			-420,533	210,150	-398,504
Short-term U.S. government and agency obligations			5	55	78
Net realized gain (loss)			-420,528	210,205	-398,426
Change in net unrealized appreciation/depreciation on
Foreign currency forward contracts			-204,333	13,803	605,371
Short-term U.S. government and agency obligations			-182	76	334
Change in net unrealized appreciation/depreciation			-204,515	13,879	605,705
Net realized and unrealized gain (loss)			-625,043	224,084	207,279
Net income (loss)			-647,290	189,060	147,153
Net income (loss) per weighted-average share			($6.36)	$1.19	$0.52
Weighted-average shares outstanding			101,795	159,192	285,533
ProShares Ultra Yen [Member]
Investment Income
Interest			1,101	1,795	3,524
Expenses
Management fee			21,963	33,569	47,964
Total expenses			21,963	33,569	47,964
Net investment income (loss)			-20,862	-31,774	-44,440
Net realized gain (loss) on
Foreign currency forward contracts			-540,398	-1,879,169	-601,937
Short-term U.S. government and agency obligations			94	68	27
Net realized gain (loss)			-540,304	-1,879,101	-601,910
Change in net unrealized appreciation/depreciation on
Foreign currency forward contracts			144,064	334,987	-597,023
Short-term U.S. government and agency obligations			-289	97	293
Change in net unrealized appreciation/depreciation			143,775	335,084	-596,730
Net realized and unrealized gain (loss)			-396,529	-1,544,017	-1,198,640
Net income (loss)			-417,391	-1,575,791	-1,243,080
Net income (loss) per weighted-average share			($3.35)	($9.90)	($8.29)
Weighted-average shares outstanding			124,672	159,192	150,014
ProShares Trust II [Member]
Investment Income
Interest			1,151,784	1,552,350	2,215,112
Expenses
Management fee			27,669,705	30,836,871	32,848,387
Brokerage commissions			4,580,430	3,202,862	1,918,624
Offering costs			16,401	141,251	328,105
Limitation by Sponsor			-9,474	-57,127	-5,373
Total expenses			32,257,062	34,123,857	35,089,743
Net investment income (loss)			-31,105,278	-32,571,507	-32,874,631
Net realized gain (loss) on
Futures contracts			-136,360,050	-398,397,208	-725,476,541
Swap agreements			-79,470,613	55,106,405	-45,027,781
Forward agreements			-155,407,226	-692,584,048	-138,196,778
Foreign currency forward contracts			210,564,249	114,287,543	73,287,609
Short-term U.S. government and agency obligations			123,212	79,408	76,646
Net realized gain (loss)			-160,550,428	-921,507,900	-835,336,845
Change in net unrealized appreciation/depreciation on
Futures contracts			9,175,329	-53,329,004	22,356,416
Swap agreements			-48,539,505	-28,257,739	35,368,727
Forward agreements			-6,131,133	132,454,565	45,390,749
Foreign currency forward contracts			-514,227	-8,979,636	-38,091,857
Short-term U.S. government and agency obligations			-73,469	-3,687	198,708
Change in net unrealized appreciation/depreciation			-46,083,005	41,884,499	65,222,743
Net realized and unrealized gain (loss)			-206,633,433	-879,623,401	-770,114,102
Net income (loss)			($237,738,711)	($912,194,908)	($802,988,733)
[1]	Since the Fund commenced investment operations on October 1, 2014, the Statements of Operations for the years ended December 31, 2013 and 2012 have not been provided.
[2]	Since the Fund commenced investment operations on October 1, 2014, the Statements of Changes in Shareholders' Equity for the years ended December 31, 2013 and 2012 have not been provided.

Statements_of_Changes_in_Share

Statements of Changes in Shareholders' Equity (USD $)		ProShares Managed Futures Strategy [Member]	ProShares VIX Short-Term Futures ETF [Member]	ProShares VIX Mid-Term Futures ETF [Member]	ProShares Short VIX Short-Term Futures ETF [Member]	ProShares Ultra VIX Short-Term Futures ETF [Member]	ProShares UltraShort Bloomberg Commodity [Member]	ProShares UltraShort Bloomberg Crude Oil [Member]	Proshares UltraShort Bloomberg Natural Gas [Member]	ProShares UltraShort Gold [Member]	ProShares Ultra Silver [Member]	ProShares Short Euro [Member]	ProShares UltraShort Australian Dollar [Member]	ProShares UltraShort Euro [Member]	ProShares UltraShort Yen [Member]	ProShares Ultra Bloomberg Commodity [Member]	ProShares Ultra Bloomberg Crude Oil [Member]	Proshares Ultra Bloomberg Natural Gas [Member]	ProShares Ultra Gold [Member]	ProShares UltraShort Silver [Member]	ProShares Ultra Australian Dollar [Member]	ProShares Ultra Euro [Member]	ProShares Ultra Yen [Member]	ProShares Trust II [Member]
Shareholders' equity, beginning of period at Dec. 31, 2011			$30,549,903	$90,821,428	$7,760,424	$9,881,113	$9,107,146	$144,389,893	$7,142,310	$198,298,571	$606,824,420			$1,100,159,546	$221,131,994	$9,058,529	$251,395,322	$4,079,349	$326,399,360	$246,813,921		$9,554,748	$5,471,075	$3,278,846,852
Addition of shares			801,055,108	127,092,035	536,782,526	1,600,919,494		230,873,903	33,115,715	2,905,948	463,625,109			263,481,506	291,223,076		853,881,447	133,210,470	49,880,610	310,340,710		1,209,580		5,711,597,237
Redemption of shares			-533,305,715	-109,233,722	-473,172,886	-1,016,798,066	-6,153,644	-319,751,491	-27,535,142	-67,923,178	-283,053,534			-795,828,879	-171,442,442	-2,753,040	-601,161,562	-57,878,299	-69,697,699	-403,268,684		-6,041,165		-4,945,005,748
Net addition (redemption) of shares			267,749,393	17,858,313	63,609,640	584,121,428		-88,877,588	5,580,573	-65,017,230	180,571,575			-532,347,373	119,780,634	-2,753,040	252,719,885	75,332,171	-19,817,089	-92,927,974		-4,831,585		766,591,489
Net investment income (loss)			-1,053,112	-786,167	-437,699	-3,001,646	-47,749	-1,078,664	-196,407	-1,106,213	-6,918,157			-7,447,508	-2,184,694	-73,484	-3,248,430	-566,310	-3,169,265	-1,403,142		-60,126	-44,440	-32,874,631
Net realized gain (loss)			-160,947,857	-75,241,872	13,206,071	-509,401,530	761,941	47,569,966	1,212,995	-10,065,649	-66,421,123			46,954,540	27,342,607	-536,107	-84,049,115	-2,835,183	-33,589,632	-28,109,405		-398,426	-601,910	-835,336,845
Change in net unrealized appreciation/depreciation			1,359,137	4,651,290	-1,474,803	3,116,767	-421,729	-12,522,341	-971,131	-29,692,737	33,668,685			-80,541,179	42,493,089	401,313	66,691,302	-2,990,657	65,231,378	-23,716,697		605,705	-596,730	65,222,743
Net income (loss)			-160,641,832	-71,376,749	11,293,569	-509,286,409	292,463	33,968,961	45,457	-40,864,599	-39,670,595			-41,034,147	67,651,002	-208,278	-20,606,243	-6,392,150	28,472,481	-53,229,244		147,153	-1,243,080	-802,988,733
Shareholders' equity, end of period at Dec. 31, 2012			137,657,464	37,302,992	82,663,633	84,716,132	3,245,965	89,481,266	12,768,340	92,416,742	747,725,400			526,778,026	408,563,630	6,097,211	483,508,964	73,019,370	335,054,752	100,656,703		4,870,316	4,227,995	3,242,449,608
Shareholders' equity, beginning of period at Jun. 25, 2012												200
Addition of shares												4,000,000
Net addition (redemption) of shares												4,000,000
Net investment income (loss)												-17,891
Net realized gain (loss)												-164,401
Change in net unrealized appreciation/depreciation												-54,868
Net income (loss)												-237,160
Shareholders' equity, end of period at Dec. 31, 2012												3,763,040
Shareholders' equity, beginning of period at Jul. 16, 2012													200								200
Addition of shares													4,000,000								4,000,000
Net addition (redemption) of shares													4,000,000
Net investment income (loss)													-16,229								-17,298
Net realized gain (loss)													-288,744								265,989
Change in net unrealized appreciation/depreciation													85,772								-98,823
Net income (loss)													-219,201								149,868
Shareholders' equity, end of period at Dec. 31, 2012			137,657,464	37,302,992	82,663,633	84,716,132	3,245,965	89,481,266	12,768,340	92,416,742	747,725,400	3,763,040	3,780,999	526,778,026	408,563,630	6,097,211	483,508,964	73,019,370	335,054,752	100,656,703	4,150,068	4,870,316	4,227,995	3,242,449,608
Addition of shares			688,146,488	151,394,850	529,295,847	1,958,417,114		764,617,811	43,490,786	233,728,116	383,200,214	5,544,514	20,808,405	119,076,233	362,152,598		334,161,435	182,988,911	30,696,013	251,109,632		1,261,329	1,323,474	6,061,413,770
Redemption of shares			-392,769,799	-105,368,702	-565,566,944	-1,379,911,693		-589,272,473	-31,362,847	-248,556,941	-101,889,611			-174,833,082	-333,515,950	-2,210,679	-740,742,859	-233,856,212	-75,003,600	-329,701,864		-3,716,878	-1,180,652	-5,309,461,386
Net addition (redemption) of shares			295,376,689	46,026,148	-36,271,097	578,505,421		175,345,338	12,127,939	-14,828,825	281,310,603	5,544,514	20,808,405	-55,756,849	28,636,648	-2,210,679	-406,581,424	-50,867,301	-44,307,587	-78,592,232		-2,455,549	142,822	751,952,384
Net investment income (loss)			-1,584,119	-546,566	-1,328,369	-4,828,761	-32,130	-2,544,628	-209,360	-1,175,860	-5,280,707	-51,170	-159,424	-4,375,512	-4,398,231	-38,477	-2,196,281	-821,690	-1,925,215	-973,304	-34,905	-35,024	-31,774	-32,571,507
Net realized gain (loss)			-144,624,652	-28,219,941	87,181,110	-405,797,946	760,026	-12,299,811	-2,584,895	61,123,058	-701,518,468	-381,830	2,720,005	-48,055,883	164,024,125	-1,254,295	120,757,237	41,422,856	-165,625,006	113,463,320	-928,014	210,205	-1,879,101	-921,507,900
Change in net unrealized appreciation/depreciation			-16,426,828	-3,428,310	9,505,925	-26,361,262	-176,434	6,077,984	632,743	1,901,341	143,242,691	22,288	833,294	-588,667	-8,704,656	321,274	-52,715,067	162,544	8,820,461	-21,564,801	-18,984	13,879	335,084	41,884,499
Net income (loss)			-162,635,599	-32,194,817	95,358,666	-436,987,969	551,462	-8,766,455	-2,161,512	61,848,539	-563,556,484	-410,712	3,393,875	-53,020,062	150,921,238	-971,498	65,845,889	40,763,710	-158,729,760	90,925,215	-981,903	189,060	-1,575,791	-912,194,908
Shareholders' equity, end of period at Dec. 31, 2013			270,398,554	51,134,323	141,751,202	226,233,584	3,797,427	256,060,149	22,734,767	139,436,456	465,479,519	8,896,842	27,983,279	418,001,115	588,121,516	2,915,034	142,773,429	62,915,779	132,017,405	112,989,686	3,168,165	2,603,827	2,795,026	3,082,207,084
Addition of shares			228,373,046	41,886,902	1,056,547,830	1,646,851,705		474,919,955	119,491,987	51,784,693	144,929,400	8,924,282		84,751,333	216,403,570	1,134,916	1,007,757,253	171,856,215	13,559,078	72,497,634		1,024,904	716,043	5,351,585,350
Redemption of shares			-408,422,699	-61,955,645	-739,931,932	-1,440,123,709		-705,083,600	-138,773,402	-95,254,958	-149,826,411	-5,692,613	-6,770,427	-95,749,761	-366,185,318		-329,639,408	-126,116,197	-41,631,461	-149,820,485			-975,650	-4,863,993,237
Net addition (redemption) of shares			-180,049,653	-20,068,743	316,615,898	206,727,996		-230,163,645	-19,281,415	-43,470,265	-4,897,011	3,231,669	-6,770,427	-10,998,428	-149,781,748	1,134,916	678,117,845	45,740,018	-28,072,383	-77,322,851		1,024,904	-259,607	487,592,113
Net investment income (loss)			-1,118,548	-386,478	-4,285,469	-5,359,486	-34,070	-2,415,841	-460,907	-857,817	-3,968,608	-118,247	-213,183	-3,994,145	-3,741,601	-30,991	-1,766,364	-528,581	-1,157,348	-585,841	-31,113	-22,247	-20,862	-31,105,278
Net realized gain (loss)			-682,105	-14,377,068	76,945,361	-139,402,604	906,312	99,347,798	8,796,882	-5,312,609	-155,543,194	1,593,450	2,296,708	83,683,592	127,860,058	-1,065,579	-243,314,151	-6,459,728	-9,672,972	15,119,117	-417,870	-420,528	-540,304	-160,550,428
Change in net unrealized appreciation/depreciation			22,911,077	5,157,541	-24,470,868	63,590,463	595,037	46,381,649	2,899,237	-7,934,003	-9,900,963	418,090	-175,587	30,499,215	-30,986,352	-346,460	-125,247,771	-31,234,281	8,888,643	2,807,756	20,985	-204,515	143,775	-46,083,005
Net income (loss)			21,110,424	-9,606,005	48,189,024	-81,171,627	1,467,279	143,313,606	11,235,212	-14,104,429	-169,412,765	1,893,293	1,907,938	110,188,662	93,132,105	-1,443,030	-370,328,286	-38,222,590	-1,941,677	17,341,032	-427,998	-647,290	-417,391	-237,738,711
Shareholders' equity, end of period at Dec. 31, 2014			111,459,325	21,459,575	506,556,124	351,789,953	5,264,706	169,210,110	14,688,564	81,861,762	291,169,743	14,021,804	23,120,790	517,191,349	531,471,873	2,606,920	450,562,988	70,433,207	102,003,345	53,007,867	2,740,167	2,981,441	2,118,028	3,332,060,486
Shareholders' equity, beginning of period at Sep. 30, 2014
Addition of shares	[1]	8,174,604
Redemption of shares	[1]	-2,039,561
Net addition (redemption) of shares	[1]	6,135,043
Net investment income (loss)	[1],[2]	-7,531
Net realized gain (loss)	[1],[2]	109,006
Change in net unrealized appreciation/depreciation	[1],[2]	104,327
Net income (loss)	[1],[2]	205,802
Shareholders' equity, end of period at Dec. 31, 2014	[1],[3]	$6,340,845
[1]	Since the Fund commenced investment operations on October 1, 2014, the Statements of Changes in Shareholders' Equity for the years ended December 31, 2013 and 2012 have not been provided.
[2]	Since the Fund commenced investment operations on October 1, 2014, the Statements of Operations for the years ended December 31, 2013 and 2012 have not been provided.
[3]	Since the Fund commenced investment operations on October 1, 2014, the Statement of Financial Condition as of December 31, 2013 has not been provided.

Statements_of_Changes_in_Share1

Statements of Changes in Shareholders' Equity (Parenthetical) (USD $)	3 Months Ended		12 Months Ended					6 Months Ended
	Dec. 31, 2014		Dec. 31, 2014	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2012	Dec. 31, 2012
ProShares Managed Futures Strategy [Member]
Addition, shares	400,010	[1]
Redemption, shares	100,000	[1]
Net addition (redemption), shares	300,010	[1]
ProShares VIX Short-Term Futures ETF [Member]
Addition, shares			10,575,000	16,095,000		5,585,000
Redemption, shares			14,725,000	8,260,189		4,025,000
Net addition (redemption), shares			-4,150,000	7,834,811		1,560,000
ProShares VIX Mid-Term Futures ETF [Member]
Addition, shares			593,750	1,512,500		606,250
Redemption, shares			918,847	1,118,750		643,750
Net addition (redemption), shares			-325,097	393,750		-37,500
ProShares Short VIX Short-Term Futures ETF [Member]
Addition, shares			16,100,000	11,500,000		20,900,000
Redemption, shares			9,950,000	11,900,000		19,000,000
Net addition (redemption), shares			6,150,000	-400,000		1,900,000
ProShares Ultra VIX Short-Term Futures ETF [Member]
Addition, shares			51,075,000	9,900,000		663,438
Redemption, shares			40,427,290	6,632,813		558,569
Net addition (redemption), shares			10,647,710	3,267,187		104,869
ProShares UltraShort Bloomberg Commodity [Member]
Redemption, shares			0	0		100,000
ProShares UltraShort Bloomberg Crude Oil [Member]
Addition, shares			15,700,000	23,300,000		5,900,000
Redemption, shares			21,600,000	17,450,000		7,400,000
Net addition (redemption), shares			-5,900,000	5,850,000		-1,500,000
Proshares UltraShort Bloomberg Natural Gas [Member]
Addition, shares			2,850,000	587,500		262,500
Redemption, shares			3,000,000	387,556		212,500
Net addition (redemption), shares			-150,000	199,944		50,000
ProShares UltraShort Gold [Member]
Addition, shares			550,000	2,650,000		50,000
Redemption, shares			1,050,000	2,750,000		1,000,497
Net addition (redemption), shares			-500,000	-100,000		-950,497
ProShares Ultra Silver [Member]
Addition, shares			2,487,500	4,112,500		2,262,500
Redemption, shares			2,440,974	1,112,500		1,425,000
Net addition (redemption), shares			46,526	3,000,000		837,500
ProShares Short Euro [Member]
Addition, shares			250,000	150,000				100,000
Redemption, shares			150,000	0				0
Net addition (redemption), shares			100,000	150,000				100,000
ProShares UltraShort Australian Dollar [Member]
Addition, shares			0	500,000					100,000
Redemption, shares			150,000	0					0
Net addition (redemption), shares			-150,000	500,000					100,000
ProShares UltraShort Euro [Member]
Addition, shares			4,500,000	6,250,000		12,900,000
Redemption, shares			5,050,000	9,450,000		39,300,000
Net addition (redemption), shares			-550,000	-3,200,000		-26,400,000
ProShares UltraShort Yen [Member]
Addition, shares			2,850,000	5,650,000		6,550,000
Redemption, shares			5,200,000	5,400,000		3,900,000
Net addition (redemption), shares			-2,350,000	250,000		2,650,000
ProShares Ultra Bloomberg Commodity [Member]
Addition, shares			50,000	0		0
Redemption, shares			0	100,000		100,000
Net addition (redemption), shares			50,000	-100,000		-100,000
ProShares Ultra Bloomberg Crude Oil [Member]
Addition, shares			50,400,000	11,450,000		28,550,000
Redemption, shares			10,450,000	23,450,000		18,250,000
Net addition (redemption), shares			39,950,000	-12,000,000		10,300,000
Proshares Ultra Bloomberg Natural Gas [Member]
Addition, shares			5,750,000	5,400,000		2,930,000
Redemption, shares			2,800,000	5,650,000		1,100,061
Net addition (redemption), shares			2,950,000	-250,000		1,829,939
ProShares Ultra Gold [Member]
Addition, shares			300,000	550,000		500,000
Redemption, shares			950,000	1,350,000		800,000
Net addition (redemption), shares			-650,000	-800,000		-300,000
ProShares UltraShort Silver [Member]
Addition, shares			900,000	3,450,000		5,960,000
Redemption, shares			1,700,000	4,150,000		7,220,385
Net addition (redemption), shares			-800,000	-700,000		-1,260,385
ProShares Ultra Australian Dollar [Member]
Addition, shares			0	0					100,000
ProShares Ultra Euro [Member]
Addition, shares			50,000	50,000		50,000
Redemption, shares			0	150,000		250,000
Net addition (redemption), shares			50,000	-100,000		-200,000
ProShares Ultra Yen [Member]
Addition, shares			50,000	50,000		0
Redemption, shares			50,000	50,000		0
Net addition (redemption), shares			0	0		0
ProShares Trust II [Member]
Addition, shares			165,431,260	103,157,500		93,969,703
Redemption, shares			120,712,111	99,361,823	[2]	105,285,762	[3]
Net addition (redemption), shares			44,719,149	3,795,677		-11,316,059
Redemptions of shares related to termination of offerings under new funds value				600
Redemptions related to de-registration						6,600
[1]	Since the Fund commenced investment operations on October 1, 2014, the Statements of Changes in Shareholders' Equity for the years ended December 31, 2013 and 2012 have not been provided.
[2]	Amount includes $600 of redemptions related to the termination of offerings of certain Funds.
[3]	Amount includes $6,600 of redemptions related to de-registration of certain Funds.

Statements_of_Cash_Flows

Statements of Cash Flows (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
ProShares VIX Short-Term Futures ETF [Member]
Cash flow from operating activities
Net income (loss)	$21,110,424		($162,635,599)		($160,641,832)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Decrease (Increase) in segregated cash balances with brokers for futures contracts	45,580,600		-29,910,352		-34,109,998
Net sale (purchase) of short-term U.S. government and agency obligations	125,541,855		-63,571,023		-116,698,511
Change in unrealized appreciation/depreciation on investments	6,229		-4,439		-4,586
Decrease (Increase) in receivable on futures contracts	-6,138,219		-3,179,017		742,451
Change in offering cost					1,090
Increase (Decrease) in management fee payable	-128,002		102,304		82,174
Increase (Decrease) in payable on futures contracts			-31,540,181		31,540,181
Net cash provided by (used in) operating activities	185,972,887		-290,738,307		-279,089,031
Cash flow from financing activities
Proceeds from addition of shares	228,373,046		690,664,556		800,446,503
Payment on shares redeemed	-416,984,894		-398,582,455		-518,930,864
Net cash provided by (used in) financing activities	-188,611,848		292,082,101		281,515,639
Net increase (decrease) in cash	-2,638,961		1,343,794		2,426,608
Cash, beginning of period	4,333,752		2,989,958		563,350
Cash, end of period	1,694,791		4,333,752		2,989,958
ProShares VIX Mid-Term Futures ETF [Member]
Cash flow from operating activities
Net income (loss)	-9,606,005		-32,194,817		-71,376,749
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Decrease (Increase) in segregated cash balances with brokers for futures contracts	6,547,440		-624,390		-7,830,000
Net sale (purchase) of short-term U.S. government and agency obligations	21,934,514		33,888,602		9,470,473
Change in unrealized appreciation/depreciation on investments	-187		2,031		-8,950
Decrease (Increase) in receivable on futures contracts	-1,682,594		-100,734		798,319
Decrease (Increase) in Limitation by Sponsor					2,481
Change in offering cost					682
Increase (Decrease) in management fee payable	-22,712		-13,917		59,365
Increase (Decrease) in payable on futures contracts			-1,890,675		1,890,675
Net cash provided by (used in) operating activities	17,170,456		-933,900		-66,993,704
Cash flow from financing activities
Proceeds from addition of shares	41,886,902		151,394,850		127,092,035
Payment on shares redeemed	-59,329,673		-150,618,268		-58,662,173
Net cash provided by (used in) financing activities	-17,442,771		776,582		68,429,862
Net increase (decrease) in cash	-272,315		-157,318		1,436,158
Cash, beginning of period	1,906,397		2,063,715		627,557
Cash, end of period	1,634,082		1,906,397		2,063,715
ProShares Short VIX Short-Term Futures ETF [Member]
Cash flow from operating activities
Net income (loss)	48,189,024		95,358,666		11,293,569
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Decrease (Increase) in segregated cash balances with brokers for futures contracts	-51,692,300		-12,821,153		-18,479,139
Net sale (purchase) of short-term U.S. government and agency obligations	-341,417,962		-51,870,875		-53,683,800
Change in unrealized appreciation/depreciation on investments	1,764		-1,795		-2,552
Decrease (Increase) in receivable on futures contracts	603,833		4,920,888		-5,524,721
Change in offering cost					21,691
Increase (Decrease) in management fee payable	289,792		68,716		43,041
Increase (Decrease) in payable on futures contracts	31,020,019
Increase (Decrease) in payable for offering costs					-28,764
Net cash provided by (used in) operating activities	-313,005,830		35,654,447		-66,360,675
Cash flow from financing activities
Proceeds from addition of shares	1,056,547,830		542,528,525		523,549,848
Payment on shares redeemed	-736,573,151		-578,266,328		-460,473,502
Net cash provided by (used in) financing activities	319,974,679		-35,737,803		63,076,346
Net increase (decrease) in cash	6,968,849		-83,356		-3,284,329
Cash, beginning of period	2,153,370		2,236,726		5,521,055
Cash, end of period	9,122,219		2,153,370		2,236,726
ProShares Ultra VIX Short-Term Futures ETF [Member]
Cash flow from operating activities
Net income (loss)	-81,171,627		-436,987,969		-509,286,409
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Decrease (Increase) in segregated cash balances with brokers for futures contracts	-9,805,950		-68,374,743		-32,423,207
Net sale (purchase) of short-term U.S. government and agency obligations	-73,110,402		-12,085,582		-97,445,279
Change in unrealized appreciation/depreciation on investments	4,701		294,289		-296,915
Decrease (Increase) in receivable on futures contracts	-42,531,441
Change in offering cost					21,691
Increase (Decrease) in management fee payable	113,369		92,830		92,397
Increase (Decrease) in payable on futures contracts	-3,356,803		-32,309,932		33,813,769
Increase (Decrease) in payable for offering costs					-28,764
Net cash provided by (used in) operating activities	-209,858,153		-549,371,107		-605,552,717
Cash flow from financing activities
Proceeds from addition of shares	1,645,206,121		1,965,640,739		1,585,261,789
Payment on shares redeemed	-1,433,851,653		-1,415,819,480		-980,890,279
Net cash provided by (used in) financing activities	211,354,468		549,821,259		604,371,510
Net increase (decrease) in cash	1,496,315		450,152		-1,181,207
Cash, beginning of period	2,240,977		1,790,825		2,972,032
Cash, end of period	3,737,292		2,240,977		1,790,825
ProShares UltraShort Gold [Member]
Cash flow from operating activities
Net income (loss)	-14,104,429		61,848,539		-40,864,599
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Decrease (Increase) in segregated cash balances with brokers for futures contracts	7,150		-1,100		2,920
Net sale (purchase) of short-term U.S. government and agency obligations	64,949,090		-60,414,067		76,103,102
Change in unrealized appreciation/depreciation on investments	7,914,963		-1,902,061		29,666,177
Decrease (Increase) in receivable on futures contracts	-2,960		-300
Increase (Decrease) in management fee payable	-53,758		49,243		-49,997
Increase (Decrease) in payable on futures contracts			-3,980		3,980
Net cash provided by (used in) operating activities	58,710,056		-423,726		64,861,583
Cash flow from financing activities
Proceeds from addition of shares	51,784,693		233,728,116		2,905,948
Payment on shares redeemed	-110,529,962		-233,281,937		-67,923,178
Net cash provided by (used in) financing activities	-58,745,269		446,179		-65,017,230
Net increase (decrease) in cash	-35,213		22,453		-155,647
Cash, beginning of period	197,647		175,194		330,841
Cash, end of period	162,434		197,647		175,194
ProShares UltraShort Silver [Member]
Cash flow from operating activities
Net income (loss)	17,341,032		90,925,215		-53,229,244
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Decrease (Increase) in segregated cash balances with brokers for futures contracts	7,700		2,200		18,940
Net sale (purchase) of short-term U.S. government and agency obligations	62,596,960		-28,622,804		129,158,389
Change in unrealized appreciation/depreciation on investments	-2,820,396		21,538,981		23,695,867
Decrease (Increase) in receivable on futures contracts	-4,320		-2,450
Increase (Decrease) in management fee payable	-51,786		8,515		-95,259
Increase (Decrease) in payable on futures contracts			-2,520		2,520
Net cash provided by (used in) operating activities	77,069,190		83,847,137		99,551,213
Cash flow from financing activities
Proceeds from addition of shares	72,497,634		251,109,632		318,778,691
Payment on shares redeemed	-149,820,485		-334,839,980		-418,633,692
Net cash provided by (used in) financing activities	-77,322,851		-83,730,348		-99,855,001
Net increase (decrease) in cash	-253,661		116,789		-303,788
Cash, beginning of period	461,167		344,378		648,166
Cash, end of period	207,506		461,167		344,378
ProShares Short Euro [Member]
Cash flow from operating activities
Net income (loss)	1,893,293		-410,712
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Decrease (Increase) in segregated cash balances with brokers for futures contracts	-114,180		-65,450
Net sale (purchase) of short-term U.S. government and agency obligations	-4,184,993		-4,491,689
Change in unrealized appreciation/depreciation on investments	472		-463
Decrease (Increase) in receivable on futures contracts	-54,150		-2,488
Decrease (Increase) in Limitation by Sponsor			2,145
Change in offering cost			19,770
Increase (Decrease) in management fee payable	4,134		6,994
Increase (Decrease) in payable for offering costs			-41,000
Net cash provided by (used in) operating activities	-2,455,424		-4,982,893
Cash flow from financing activities
Proceeds from addition of shares	8,924,282		5,544,514
Payment on shares redeemed	-5,692,613
Net cash provided by (used in) financing activities	3,231,669		5,544,514
Net increase (decrease) in cash	776,245		561,621
Cash, beginning of period	863,980		302,359
Cash, end of period	1,640,225		863,980		302,359
ProShares UltraShort Australian Dollar [Member]
Cash flow from operating activities
Net income (loss)	1,907,938		3,393,875
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Decrease (Increase) in segregated cash balances with brokers for futures contracts	121,418		-997,095
Net sale (purchase) of short-term U.S. government and agency obligations	3,929,365		-20,894,321
Change in unrealized appreciation/depreciation on investments	1,463		-1,279
Decrease (Increase) in receivable on futures contracts	-62,534
Decrease (Increase) in Limitation by Sponsor			2,216
Change in offering cost			22,129
Increase (Decrease) in management fee payable	-3,620		22,017
Increase (Decrease) in payable on futures contracts	-86,166		75,216
Increase (Decrease) in payable for offering costs			-41,000
Net cash provided by (used in) operating activities	5,807,864		-18,418,242
Cash flow from financing activities
Proceeds from addition of shares			20,808,405
Payment on shares redeemed	-6,770,427
Net cash provided by (used in) financing activities	-6,770,427		20,808,405
Net increase (decrease) in cash	-962,563		2,390,163
Cash, beginning of period	2,751,320		361,157
Cash, end of period	1,788,757		2,751,320		361,157
ProShares UltraShort Euro [Member]
Cash flow from operating activities
Net income (loss)	110,188,662		-53,020,062		-41,034,147
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Net sale (purchase) of short-term U.S. government and agency obligations	-49,276,244		115,595,671		458,781,066
Change in unrealized appreciation/depreciation on investments	-30,499,215		588,667		80,541,179
Increase (Decrease) in management fee payable	40,427		-153,734		-348,383
Net cash provided by (used in) operating activities	30,453,630		63,010,542		497,939,715
Cash flow from financing activities
Proceeds from addition of shares	71,794,729		119,076,233		284,781,239
Payment on shares redeemed	-101,720,845		-182,144,207		-782,546,670
Net cash provided by (used in) financing activities	-29,926,116		-63,067,974		-497,765,431
Net increase (decrease) in cash	527,514		-57,432		174,284
Cash, beginning of period	218,940		276,372		102,088
Cash, end of period	746,454		218,940		276,372
ProShares UltraShort Yen [Member]
Cash flow from operating activities
Net income (loss)	93,132,105		150,921,238		67,651,002
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Net sale (purchase) of short-term U.S. government and agency obligations	25,618,625		-195,831,198		-143,324,171
Change in unrealized appreciation/depreciation on investments	30,986,352		8,704,656		-42,493,089
Increase (Decrease) in management fee payable	2,264		166,305		91,011
Net cash provided by (used in) operating activities	149,739,346		-36,038,999		-118,075,247
Cash flow from financing activities
Proceeds from addition of shares	216,403,570		369,766,231		289,859,177
Payment on shares redeemed	-366,185,318		-333,515,950		-171,442,442
Net cash provided by (used in) financing activities	-149,781,748		36,250,281		118,416,735
Net increase (decrease) in cash	-42,402		211,282		341,488
Cash, beginning of period	575,108		363,826		22,338
Cash, end of period	532,706		575,108		363,826
ProShares Ultra Gold [Member]
Cash flow from operating activities
Net income (loss)	-1,941,677		-158,729,760		28,472,481
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Decrease (Increase) in segregated cash balances with brokers for futures contracts	7,150		-1,100		8,100
Net sale (purchase) of short-term U.S. government and agency obligations	38,958,468		209,724,651		48,713,572
Change in unrealized appreciation/depreciation on investments	-8,869,503		-8,819,781		-65,204,958
Decrease (Increase) in receivable on futures contracts			3,980		-3,440
Increase (Decrease) in management fee payable	-25,929		-167,707		-23,851
Increase (Decrease) in payable on futures contracts	2,960		300
Net cash provided by (used in) operating activities	28,131,469		42,010,583		11,961,904
Cash flow from financing activities
Proceeds from addition of shares	13,559,078		30,696,013		57,677,607
Payment on shares redeemed	-41,728,968		-72,906,375		-69,697,699
Net cash provided by (used in) financing activities	-28,169,890		-42,210,362		-12,020,092
Net increase (decrease) in cash	-38,421		-199,779		-58,188
Cash, beginning of period	142,566		342,345		400,533
Cash, end of period	104,145		142,566		342,345
ProShares Ultra Silver [Member]
Cash flow from operating activities
Net income (loss)	-169,412,765		-563,556,484		-39,670,595
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Decrease (Increase) in segregated cash balances with brokers for futures contracts	7,700		2,200		25,750
Net sale (purchase) of short-term U.S. government and agency obligations	162,383,402		423,157,455		-119,069,929
Change in unrealized appreciation/depreciation on investments	9,913,603		-143,216,871		-33,647,855
Decrease (Increase) in receivable on futures contracts			2,520		3,480
Increase (Decrease) in management fee payable	-125,078		-277,880		87,573
Increase (Decrease) in payable on futures contracts	4,320		2,450
Net cash provided by (used in) operating activities	2,771,182		-283,886,610		-192,271,576
Cash flow from financing activities
Proceeds from addition of shares	144,929,400		385,349,171		475,442,719
Payment on shares redeemed	-147,858,579		-101,889,611		-283,053,534
Net cash provided by (used in) financing activities	-2,929,179		283,459,560		192,389,185
Net increase (decrease) in cash	-157,997		-427,050		117,609
Cash, beginning of period	463,001		890,051		772,442
Cash, end of period	305,004		463,001		890,051
ProShares Ultra Australian Dollar [Member]
Cash flow from operating activities
Net income (loss)	-427,998		-981,903
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Decrease (Increase) in segregated cash balances with brokers for futures contracts	8,734		29,535
Net sale (purchase) of short-term U.S. government and agency obligations	310,344		854,661
Change in unrealized appreciation/depreciation on investments	410		-206
Decrease (Increase) in receivable on futures contracts	10,650		1,350
Decrease (Increase) in Limitation by Sponsor			1,012
Change in offering cost			22,128
Increase (Decrease) in management fee payable	-337		2,585
Increase (Decrease) in payable on futures contracts	6,369
Increase (Decrease) in payable for offering costs			-41,000
Net cash provided by (used in) operating activities	-91,828		-111,838
Cash flow from financing activities
Net increase (decrease) in cash	-91,828		-111,838
Cash, beginning of period	314,796		426,634
Cash, end of period	222,968		314,796		426,634
ProShares Ultra Euro [Member]
Cash flow from operating activities
Net income (loss)	-647,290		189,060		147,153
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Net sale (purchase) of short-term U.S. government and agency obligations	39,983		2,091,157		5,522,097
Change in unrealized appreciation/depreciation on investments	204,515		-13,879		-605,705
Increase (Decrease) in management fee payable	-718		-1,152		-2,343
Net cash provided by (used in) operating activities	-403,510		2,265,186		5,061,202
Cash flow from financing activities
Proceeds from addition of shares	1,024,904		1,261,329		1,209,580
Payment on shares redeemed			-3,716,878		-6,041,165
Net cash provided by (used in) financing activities	1,024,904		-2,455,549		-4,831,585
Net increase (decrease) in cash	621,394		-190,363		229,617
Cash, beginning of period	49,723		240,086		10,469
Cash, end of period	671,117		49,723		240,086
ProShares Ultra Yen [Member]
Cash flow from operating activities
Net income (loss)	-417,391		-1,575,791		-1,243,080
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Net sale (purchase) of short-term U.S. government and agency obligations	1,640,398		1,659,459		779,250
Change in unrealized appreciation/depreciation on investments	-143,775		-335,084		596,730
Increase (Decrease) in management fee payable	-822		-1,323		-665
Net cash provided by (used in) operating activities	1,078,410		-252,739		132,235
Cash flow from financing activities
Proceeds from addition of shares	716,043		1,323,474
Payment on shares redeemed	-975,650		-1,180,652
Net cash provided by (used in) financing activities	-259,607		142,822
Net increase (decrease) in cash	818,803		-109,917		132,235
Cash, beginning of period	28,116		138,033		5,798
Cash, end of period	846,919		28,116		138,033
ProShares Trust II [Member]
Cash flow from operating activities
Net income (loss)	-237,738,711		-912,194,908		-802,988,733
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Decrease (Increase) in segregated cash balances with brokers for futures contracts	-61,515,085		-93,386,617		-107,523,285
Net sale (purchase) of short-term U.S. government and agency obligations	-159,484,224		488,816,068		-20,329,180
Change in unrealized appreciation/depreciation on investments	55,258,334		-95,213,503		-42,866,327
Decrease (Increase) in receivable on futures contracts	-49,071,751		2,682,450		-7,365,990
Decrease (Increase) in Limitation by Sponsor	-9,474		5,373		-2,892
Change in offering cost	-49,384		64,027		1,223,953	[1]
Increase (Decrease) in management fee payable	134,637		-206,989		132,412
Increase (Decrease) in payable on futures contracts	36,334,537		-64,914,699		73,133,194
Increase (Decrease) in payable for offering costs	65,785		-123,000		-1,190,302	[1]
Net cash provided by (used in) operating activities	-416,075,336		-674,471,798		-907,777,150
Cash flow from financing activities
Proceeds from addition of shares	5,304,403,567		6,098,182,208		5,726,055,194
Payment on shares redeemed	-4,875,819,732		-5,420,279,034	[2]	-4,817,463,733	[3]
Net cash provided by (used in) financing activities	428,583,835		677,903,174		908,591,461
Net increase (decrease) in cash	12,508,499		3,431,376		814,311
Cash, beginning of period	23,390,732		19,959,356		19,145,045
Cash, end of period	35,899,231		23,390,732		19,959,356
ProShares Managed Futures Strategy [Member]
Cash flow from financing activities
Cash, end of period	6,135,185	[4]
ProShares UltraShort Bloomberg Commodity [Member]
Cash flow from operating activities
Net income (loss)	1,467,279		551,462		292,463
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Net sale (purchase) of short-term U.S. government and agency obligations	-779,545		-650,253		5,731,306
Change in unrealized appreciation/depreciation on investments	-595,037		176,434		421,729
Increase (Decrease) in management fee payable	824		483		-4,795
Net cash provided by (used in) operating activities	93,521		78,126		6,440,703
Cash flow from financing activities
Payment on shares redeemed					-6,153,644
Net cash provided by (used in) financing activities					-6,153,644
Net increase (decrease) in cash	93,521		78,126		287,059
Cash, beginning of period	374,245		296,119		9,060
Cash, end of period	467,766		374,245		296,119
ProShares UltraShort Bloomberg Crude Oil [Member]
Cash flow from operating activities
Net income (loss)	143,313,606		-8,766,455		33,968,961
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Decrease (Increase) in segregated cash balances with brokers for futures contracts	-4,659,270		-3,232,021		4,677,309
Net sale (purchase) of short-term U.S. government and agency obligations	115,981,311		-160,531,358		44,894,524
Change in unrealized appreciation/depreciation on investments	-29,342,273		-3,281,036		8,245,580
Decrease (Increase) in receivable on futures contracts	210,412		-1,503,943		576,597
Increase (Decrease) in management fee payable	-73,442		131,573		-39,824
Increase (Decrease) in payable on futures contracts			-979,336		979,336
Net cash provided by (used in) operating activities	225,430,344		-178,162,576		93,302,483
Cash flow from financing activities
Proceeds from addition of shares	474,919,955		768,649,288		226,842,426
Payment on shares redeemed	-701,228,946		-589,272,473		-319,751,491
Net cash provided by (used in) financing activities	-226,308,991		179,376,815		-92,909,065
Net increase (decrease) in cash	-878,647		1,214,239		393,418
Cash, beginning of period	1,872,915		658,676		265,258
Cash, end of period	994,268		1,872,915		658,676
Proshares UltraShort Bloomberg Natural Gas [Member]
Cash flow from operating activities
Net income (loss)	11,235,212		-2,161,512		45,457
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Decrease (Increase) in segregated cash balances with brokers for futures contracts	-2,021,030		-589,770		-355,255
Net sale (purchase) of short-term U.S. government and agency obligations	9,602,075		-8,232,404		-7,420,303
Change in unrealized appreciation/depreciation on investments	-72		422		-744
Decrease (Increase) in receivable on futures contracts	597,017		-887,771		-509,649
Change in offering cost					20,150
Increase (Decrease) in management fee payable	309		-2,317		7,189
Increase (Decrease) in payable for offering costs					-26,624
Net cash provided by (used in) operating activities	19,413,511		-11,873,352		-8,239,779
Cash flow from financing activities
Proceeds from addition of shares	119,491,987		43,490,786		33,115,715
Payment on shares redeemed	-138,773,402		-31,362,847		-27,535,142
Net cash provided by (used in) financing activities	-19,281,415		12,127,939		5,580,573
Net increase (decrease) in cash	132,096		254,587		-2,659,206
Cash, beginning of period	564,647		310,060		2,969,266
Cash, end of period	696,743		564,647		310,060
ProShares Ultra Bloomberg Commodity [Member]
Cash flow from operating activities
Net income (loss)	-1,443,030		-971,498		-208,278
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Net sale (purchase) of short-term U.S. government and agency obligations	61,744		3,424,191		3,473,138
Change in unrealized appreciation/depreciation on investments	346,460		-321,274		-401,313
Increase (Decrease) in management fee payable	-48		-2,644		-2,414
Net cash provided by (used in) operating activities	-1,034,874		2,128,775		2,861,133
Cash flow from financing activities
Proceeds from addition of shares	1,134,916
Payment on shares redeemed			-2,210,679		-2,753,040
Net cash provided by (used in) financing activities	1,134,916		-2,210,679		-2,753,040
Net increase (decrease) in cash	100,042		-81,904		108,093
Cash, beginning of period	85,642		167,546		59,453
Cash, end of period	185,684		85,642		167,546
ProShares Ultra Bloomberg Crude Oil [Member]
Cash flow from operating activities
Net income (loss)	-370,328,286		65,845,889		-20,606,243
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Decrease (Increase) in segregated cash balances with brokers for futures contracts	-30,783,225		19,534,732		-9,153,834
Net sale (purchase) of short-term U.S. government and agency obligations	-329,772,459		300,221,449		-190,718,535
Change in unrealized appreciation/depreciation on investments	78,146,323		31,381,318		-43,365,562
Decrease (Increase) in receivable on futures contracts			3,430,415		-3,430,415
Increase (Decrease) in management fee payable	185,707		-267,682		186,722
Increase (Decrease) in payable on futures contracts	4,820,056		997,210
Net cash provided by (used in) operating activities	-647,731,884		421,143,331		-267,087,867
Cash flow from financing activities
Proceeds from addition of shares	979,031,080		334,161,435		853,881,447
Payment on shares redeemed	-329,639,408		-756,814,102		-585,090,319
Net cash provided by (used in) financing activities	649,391,672		-422,652,667		268,791,128
Net increase (decrease) in cash	1,659,788		-1,509,336		1,703,261
Cash, beginning of period	689,596		2,198,932		495,671
Cash, end of period	2,349,384		689,596		2,198,932
Proshares Ultra Bloomberg Natural Gas [Member]
Cash flow from operating activities
Net income (loss)	-38,222,590		40,763,710		-6,392,150
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Decrease (Increase) in segregated cash balances with brokers for futures contracts	-14,531,880		3,661,890		-9,538,681
Net sale (purchase) of short-term U.S. government and agency obligations	5,509,247		5,394,346		-64,312,441
Change in unrealized appreciation/depreciation on investments	1,537		-2,133		-783
Change in offering cost					20,150
Increase (Decrease) in management fee payable	-15,937		29,802		50,471
Increase (Decrease) in payable on futures contracts	3,923,782		736,749		4,891,783
Increase (Decrease) in payable for offering costs					-26,624
Net cash provided by (used in) operating activities	-43,335,841		50,584,364		-75,308,275
Cash flow from financing activities
Proceeds from addition of shares	168,002,793		182,988,911		133,210,470
Payment on shares redeemed	-126,116,197		-233,856,212		-57,878,299
Net cash provided by (used in) financing activities	41,886,596		-50,867,301		75,332,171
Net increase (decrease) in cash	-1,449,245		-282,937		23,896
Cash, beginning of period	3,102,827		3,385,764		3,361,868
Cash, end of period	$1,653,582		$3,102,827		$3,385,764
[1]	Amount includes $1,079,526 of offering cost related to de-registration of certain Funds.
[2]	Amount includes $600 of redemptions related to the termination of offerings of certain Funds.
[3]	Amount includes $6,600 of redemption related to de-registration of certain Funds.
[4]	Since the Fund commenced investment operations on October 1, 2014, the Statement of Financial Condition as of December 31, 2013 has not been provided.

Statements_of_Financial_Condit1

Statements of Financial Condition (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
ProShares VIX Short-Term Futures ETF [Member]
Short-term U.S. government and agency obligations, cost	$82,086,464	$207,628,319
ProShares VIX Mid-Term Futures ETF [Member]
Short-term U.S. government and agency obligations, cost	24,104,754	46,039,268
ProShares Short VIX Short-Term Futures ETF [Member]
Short-term U.S. government and agency obligations, cost	446,972,637	105,554,675
ProShares Ultra VIX Short-Term Futures ETF [Member]
Short-term U.S. government and agency obligations, cost	182,641,263	109,530,861
ProShares UltraShort Bloomberg Commodity [Member]
Short-term U.S. government and agency obligations, cost	4,233,396	3,453,851
ProShares UltraShort Bloomberg Crude Oil [Member]
Short-term U.S. government and agency obligations, cost	131,592,367	247,573,678
Proshares UltraShort Bloomberg Natural Gas [Member]
Short-term U.S. government and agency obligations, cost	8,672,527	18,274,602
ProShares UltraShort Gold [Member]
Short-term U.S. government and agency obligations, cost	84,038,905	148,987,995
ProShares Ultra Silver [Member]
Short-term U.S. government and agency obligations, cost	305,465,636	467,849,038
ProShares Short Euro [Member]
Short-term U.S. government and agency obligations, cost	12,086,398	7,901,405
ProShares UltraShort Australian Dollar [Member]
Short-term U.S. government and agency obligations, cost	20,267,681	24,197,046
ProShares UltraShort Euro [Member]
Short-term U.S. government and agency obligations, cost	487,097,789	437,821,545
ProShares UltraShort Yen [Member]
Short-term U.S. government and agency obligations, cost	532,944,509	558,563,134
ProShares Ultra Bloomberg Commodity [Member]
Short-term U.S. government and agency obligations, cost	2,754,883	2,816,627
ProShares Ultra Bloomberg Crude Oil [Member]
Short-term U.S. government and agency obligations, cost	467,195,638	137,423,179
Proshares Ultra Bloomberg Natural Gas [Member]
Short-term U.S. government and agency obligations, cost	53,408,848	58,918,095
ProShares Ultra Gold [Member]
Short-term U.S. government and agency obligations, cost	101,925,636	140,884,104
ProShares UltraShort Silver [Member]
Short-term U.S. government and agency obligations, cost	52,225,712	114,822,672
ProShares Ultra Australian Dollar [Member]
Short-term U.S. government and agency obligations, cost	2,405,682	2,716,026
ProShares Ultra Euro [Member]
Short-term U.S. government and agency obligations, cost	2,415,732	2,455,715
ProShares Ultra Yen [Member]
Short-term U.S. government and agency obligations, cost	1,287,844	2,928,242
ProShares Trust II [Member]
Short-term U.S. government and agency obligations, cost	$3,005,824,301	$2,846,340,077

Statements_of_Cash_Flows_Paren

Statements of Cash Flows (Parenthetical) (ProShares Trust II [Member], USD $)	12 Months Ended
	Dec. 31, 2012
ProShares Trust II [Member]
Offering cost related to de-registration of funds	$1,079,526
Redemptions related to de-registration of funds	$6,600

Organization

Organization	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Organization	NOTE 1 – ORGANIZATION
	ProShares Trust II (formerly known as the Commodities and Currencies Trust) (the “Trust”) is a Delaware statutory trust formed on October 9, 2007 and is currently organized into separate series (each, a “Fund” and collectively, the “Funds”). As of December 31, 2014, the following twenty-two series of the Trust have commenced investment operations: (i) ProShares Managed Futures Strategy (the “Managed Futures Fund”); (ii) ProShares VIX Short-Term Futures ETF and ProShares VIX Mid-Term Futures ETF (each, a “Matching VIX Fund” and collectively, the “Matching VIX Funds”); (iii) ProShares Short VIX Short-Term Futures ETF and ProShares Ultra VIX Short-Term Futures ETF (each, a “Geared VIX Fund” and collectively, the “Geared VIX Funds”); and (iv) ProShares UltraShort Bloomberg Commodity, ProShares UltraShort Bloomberg Crude Oil, ProShares UltraShort Bloomberg Natural Gas, ProShares UltraShort Gold, ProShares UltraShort Silver, ProShares UltraShort Australian Dollar, ProShares UltraShort Euro, ProShares UltraShort Yen, ProShares Ultra Bloomberg Commodity, ProShares Ultra Bloomberg Crude Oil, ProShares Ultra Bloomberg Natural Gas, ProShares Ultra Gold, ProShares Ultra Silver, ProShares Ultra Australian Dollar, ProShares Ultra Euro and ProShares Ultra Yen (each, a “Leveraged Fund” and collectively, the “Leveraged Funds”); and (v) ProShares Short Euro (the “Short Euro Fund”). Each of the Funds listed above issues common units of beneficial interest (“Shares”), which represent units of fractional undivided beneficial interest in and ownership of only that Fund. The Shares of each Fund are listed on the New York Stock Exchange Archipelago (“NYSE Arca”). The Leveraged Funds, the Short Euro Fund and the Geared VIX Funds, are collectively referred to as the “Geared Funds” in these Notes to Financial Statements. The Geared VIX Funds and the Matching VIX Funds are collectively referred to as the “VIX Funds” in these Notes to Financial Statements.
	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 Commodity, ProShares UltraShort Bloomberg Crude Oil, ProShares UltraShort Gold, ProShares UltraShort Silver, ProShares UltraShort Euro, ProShares UltraShort Yen, ProShares Ultra Bloomberg Commodity, 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,” or “Ultra Funds” refer to the different Funds based upon their investment objectives, but without distinguishing among the Funds’ benchmarks.
	References to “Commodity Index Funds,” “Commodity Funds” and “Currency Funds” refer to the different Funds according to their general benchmark categories without distinguishing among the Funds’ investment objectives or Fund-specific benchmarks. References to “VIX Funds” refer to the different Funds based upon their investment objective and their general benchmark categories.
	Each “Short” Fund seeks daily investment results (before fees and expenses) that correspond to the inverse (-1x) of the daily performance of its corresponding benchmark. Each “UltraShort” Fund seeks daily investment results (before fees and expenses) that correspond to two times the inverse (-2x) of the daily performance of its corresponding benchmark. Each “Ultra” Fund seeks daily investment results (before fees and expenses) that correspond to two times (2x) the daily performance of its corresponding benchmark. Each Matching VIX Fund and the Managed Futures Fund seeks investment results (before fees and expenses), both over a single day and over time, that match the performance of its corresponding benchmark. Daily performance is measured from the calculation of one NAV to the next.
	The Geared Funds do not seek to achieve their stated investment objective over a period of time greater than a single day because mathematical compounding prevents the Geared Funds from achieving such results. Accordingly, results over periods of time greater than a single day should not be expected to be a simple multiple (e.g., -1x, -2x or 2x) of the period return of the corresponding benchmark and will likely differ significantly.
	The Matching VIX Funds and the Managed Futures Fund seek to achieve their stated investment objective both over a single day and over time.
	Each of the Funds generally invests in Financial Instruments (i.e., instruments whose value is derived from the value of an underlying asset, rate or index, including futures contracts, swap agreements, forward contracts and other instruments) as a substitute for investing directly in commodities, currencies, or spot volatility products in order to gain exposure to its applicable underlying commodity futures index, commodity, currency exchange rate or equity volatility index. Financial Instruments also are used to produce economically “inverse,” “inverse leveraged” or “leveraged” investment results for the Geared Funds.
	Effective as of July 1, 2014, the official name for the Dow Jones-UBS Commodity Index and its sub-indexes (Dow Jones-UBS WTI Crude Oil SubindexSM and Dow Jones- UBS Natural Gas SubindexSM) changed to the Bloomberg Commodity Index, Bloomberg WTI Crude Oil SubindexSM and Bloomberg Natural Gas SubindexSM, respectively. The changes were made to reflect the transfer of several Dow Jones-UBS indexes to Bloomberg L.P. The methodology for the underlying index of each Commodity Index Fund will remain the same in all material respects. As a result, the fund name, underlying index name and ticker symbol changed for each of the Commodity Index Funds and are reflected in the financial statements and footnotes. The new name, underlying index name and ticker symbol for each of the Commodity Index Funds are as follows:
	Prior Fund Name	New Fund Name	Prior Underlying Index	New Underlying Index
			Name and Ticker	Name and Ticker
			Symbol	Symbol
	ProShares UltraShort DJ-UBS Commodity	ProShares UltraShort Bloomberg Commodity	Dow Jones – UBS Commodity	Bloomberg Commodity IndexSM – BCOM
			IndexSM – DJUBS
	ProShares Ultra DJ-UBS Commodity	ProShares Ultra Bloomberg Commodity	Dow Jones – UBS Commodity	Bloomberg Commodity IndexSM – BCOM
			IndexSM – DJUBS
	ProShares UltraShort DJ-UBS Crude Oil	ProShares UltraShort Bloomberg Crude Oil	Dow Jones – UBS WTI Crude Oil SubindexSM – DJUBCL	Bloomberg WTI Crude Oil SubindexSM – BCOMCL
	ProShares Ultra DJ-UBS Crude Oil	ProShares Ultra Bloomberg Crude Oil	Dow Jones – UBS WTI Crude Oil SubindexSM – DJUBCL	Bloomberg WTI Crude Oil SubindexSM – BCOMCL
	ProShares UltraShort DJ-UBS Natural Gas	ProShares UltraShort Bloomberg Natural Gas	Dow Jones – UBS Natural Gas	Bloomberg Natural Gas
			SubindexSM – DJUBNG	SubindexSM – BCOMNG
	ProShares Ultra DJ-UBS Natural Gas	ProShares Ultra Bloomberg Natural Gas	Dow Jones – UBS Natural Gas	Bloomberg Natural Gas SubindexSM –
			SubindexSM – DJUBNG	BCOMNG
	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, 2012, 2013 and 2014. The ticker symbols for these Funds did not change, and each Fund continues to trade on the NYSE Arca.
	Fund	Execution Date	Type of Split	Date Trading
		(Prior to Opening		Resumed at Post-
		of Trading)		Split Price
	ProShares VIX Short-Term Futures ETF	10-Jun-13	1-for-5 reverse Share split	10-Jun-13
	ProShares VIX Mid-Term Futures ETF	November 6, 2014	1-for-4 reverse Share split	November 6, 2014
	ProShares Short VIX Short-Term Futures ETF	October 5, 2012	2-for-1 Share split	October 5, 2012
	ProShares Short VIX Short-Term Futures ETF	January 21, 2014	2-for-1 Share split	January 24, 2014
	ProShares Ultra VIX Short-Term Futures ETF	March 8, 2012	1-for-6 reverse Share split	March 8, 2012
	ProShares Ultra VIX Short-Term Futures ETF	September 7, 2012	1-for-10 reverse Share split	September 7, 2012
	ProShares Ultra VIX Short-Term Futures ETF	10-Jun-13	1-for-10 reverse Share split	10-Jun-13
	ProShares Ultra VIX Short-Term Futures ETF	January 21, 2014	1-for-4 reverse Share split	January 24, 2014
	ProShares UltraShort Bloomberg Natural Gas	May 11, 2012	3-for-1 Share split	May 11, 2012
	ProShares UltraShort Bloomberg Natural Gas	10-Jun-13	1-for-4 reverse Share split	June 10, 2013
	ProShares UltraShort Gold	October 5, 2012	1-for-4 reverse Share split	October 5, 2012
	ProShares UltraShort Silver	May 11, 2012	1-for-5 reverse Share split	May 11, 2012
	ProShares Ultra Bloomberg Natural Gas	May 11, 2012	1-for-5 reverse Share split	May 11, 2012
	ProShares Ultra Silver	January 21, 2014	1-for-4 reverse Share split	January 24, 2014
	The reverse splits were applied retroactively for all periods presented, reducing the number of Shares outstanding for each of ProShares VIX Short-Term Futures ETF, ProShares VIX Mid-Term Futures ETF, ProShares Ultra VIX Short-Term Futures ETF, UltraShort Bloomberg Natural Gas, ProShares UltraShort Gold, ProShares Ultra Bloomberg Natural Gas and ProShares Ultra Silver, 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 ProShares Short VIX Short-Term Futures ETF and ProShares UltraShort Bloomberg Natural Gas, 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_Policie

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Significant Accounting Policies	NOTE 2 – SIGNIFICANT ACCOUNTING POLICIES
	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 and disclosures in these financial statements. 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.
	In June 2013, the FASB issued Accounting Standard Update No. 2013-08, “Financial Services – Investment Companies (“Topic 946”): Amendments to the Scope, Measurement and Disclosure Requirements” (“ASU 2013-08”). ASU 2013-08 clarifies the characteristics of an investment company and provides comprehensive guidance for assessing whether an entity is an investment company and for the measurement of non-controlling ownership interests in other investment companies. The Trust and each Fund meet the requirements to be classified as an investment company and follow the accounting and reporting guidance in FASB Topic 946.
	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, 2014 and 2013, and represents non-segregated cash with the custodian and does not include short-term investments.
	Final Net Asset Value for Fiscal Period
	The times of the calculation of the Funds’ final net asset value for creation and redemption of fund shares for the year ended December 31, 2014 were as follows. All times are Eastern Standard Time:
			NAV Calculation Time			NAV Calculation Date
	UltraShort Silver, Ultra Silver			7:00 a.m.			December 31
	UltraShort Gold, Ultra Gold			10:00 a.m.			31-Dec
	UltraShort Bloomberg Crude Oil, Ultra Bloomberg Crude Oil			2:30 p.m.			31-Dec
	UltraShort Bloomberg Natural Gas, Ultra Bloomberg Natural Gas			2:30 p.m.			31-Dec
	UltraShort Bloomberg Commodity, Ultra Bloomberg Commodity			2:30 p.m.	*		31-Dec
	Managed Futures Strategy			3:00 p.m.			31-Dec
	UltraShort Australian Dollar, Ultra Australian Dollar			4:00 p.m.			31-Dec
	Short Euro, UltraShort Euro, Ultra Euro			4:00 p.m.			31-Dec
	UltraShort Yen, Ultra Yen			4:00 p.m.			31-Dec
	VIX Short-Term Futures ETF, Short VIX Short-Term Futures ETF, Ultra VIX Short-Term Futures ETF			4:15 p.m.			31-Dec
	VIX Mid-Term Futures ETF			4:15 p.m.			31-Dec
	*	On July 31, 2014, the NAV Calculation Time for the Bloomberg Commodity Index was changed from 3:00 p.m. to 2:30 p.m.
	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, 2014.
	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, 2014.
	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 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 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. If there was no sale on that day, and for non-exchange-traded derivatives, 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 for such day. Such fair value prices would be generally 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 normal industry standards. When market closing prices are not available, the Sponsor may fair value an asset of a Fund pursuant to the policies the Sponsor has adopted, which are consistent with normal industry standards. 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, 2014 using the fair value hierarchy:
			Level I - Quoted Prices						Level II - Other Significant Observable Inputs
			Short-Term U.S.			Futures			Forward			Foreign			Swap			Total
			Government and			Contracts*			Agreements			Currency			Agreements
			Agencies									Forward
												Contracts
	Managed Futures Strategy		$	—		$	104,327		$	—		$	—		$	—		$	104,327
	VIX Short-Term Futures ETF			82,088,299			6,264,620			—			—			—			88,352,919
	VIX Mid-Term Futures ETF			24,105,906			260,665			—			—			—			24,366,571
	Short VIX Short-Term Futures ETF			446,975,220			(16,352,149	)		—			—			—			430,623,071
	Ultra VIX Short-Term Futures ETF			182,639,188			39,585,253			—			—			—			222,224,441
	UltraShort Bloomberg Commodity			4,233,548			—			—			—			567,259			4,800,807
	UltraShort Bloomberg Crude Oil			131,594,608			15,806,603			—			—			27,018,077			174,419,288
	UltraShort Bloomberg Natural Gas			8,672,710			3,941,465			—			—			—			12,614,175
	UltraShort Gold			84,040,107			(4,520	)		(2,282,778	)		—			—			81,752,809
	UltraShort Silver			52,226,692			1,560			594,953			—			—			52,823,205
	Short Euro			12,086,577			385,331			—			—			—			12,471,908
	UltraShort Australian Dollar			20,267,679			743,481			—			—			—			21,011,160
	UltraShort Euro			487,111,117			—			—			16,762,994			—			503,874,111
	UltraShort Yen			532,957,746			—			—			(1,578,775	)		—			531,378,971
	Ultra Bloomberg Commodity			2,754,900			—			—			—			(331,338	)		2,423,562
	Ultra Bloomberg Crude Oil			467,200,736			(46,474,787	)		—			—			(76,181,097	)		344,544,852
	Ultra Bloomberg Natural Gas			53,410,227			(34,889,283	)		—			—			—			18,520,944
	Ultra Gold			101,927,857			4,580			2,051,154			—			—			103,983,591
	Ultra Silver			305,474,211			(1,560	)		(12,395,120	)		—			—			293,077,531
Ultra Australian Dollar			2,405,685			(96,825	)		—			—			—			2,308,860
Ultra Euro			2,415,698			—			—			(103,371	)		—			2,312,327
Ultra Yen			1,287,869			—			—			(15,245	)		—			1,272,624
Total Trust		$	3,005,876,580		$	(30,721,239	)	$	(12,031,791	)	$	15,065,603		$	(48,927,099	)	$	2,929,262,054
*	Includes cumulative appreciation/depreciation of futures contracts as reported in the Schedules of Investments. Only current day’s variation margin is reported within the Statements of Financial Condition in receivable/payable on open futures.
At December 31, 2014, there were no Level III portfolio investments for which significant unobservable inputs were used to determine fair value.
The Funds’ policy is to recognize transfers between valuation levels at the end of the reporting period.
At December 31, 2014, there were no significant transfers in or out of Level I and Level II fair value measurements.
The inputs or methodology used for valuing investments are not necessarily an indication of the risk associated with investing in those securities.
The following table summarizes the valuation of investments at December 31, 2013 using the fair value hierarchy:
		Level I - Quoted Prices						Level II - Other Significant Observable Inputs
		Short-Term U.S.			Futures			Forward			Foreign			Swap			Total
		Government and			Contracts*			Agreements			Currency			Agreements
		Agencies									Forward
											Contracts
VIX Short-Term Futures ETF		$	207,636,383		$	(16,652,686	)	$	—		$	—		$	—		$	190,983,697
VIX Mid-Term Futures ETF			46,040,233			(4,896,689	)		—			—			—			41,143,544
Short VIX Short-Term Futures ETF			105,559,022			8,116,955			—			—			—			113,675,977
Ultra VIX Short-Term Futures ETF			109,533,487			(24,009,911	)		—			—			—			85,523,576
UltraShort Bloomberg Commodity			3,453,890			—			—			—			(27,665	)		3,426,225
UltraShort Bloomberg Crude Oil			247,584,623			(1,232,773	)		—			—			(2,332,900	)		244,018,950
UltraShort Bloomberg Natural Gas			18,274,713			1,042,300			—			—			—			19,317,013
UltraShort Gold			148,988,329			14,520			5,633,053			—			—			154,635,902
UltraShort Silver			114,826,066			14,200			(2,227,857	)		—			—			112,612,409
Short Euro			7,902,056			(33,231	)		—			—			—			7,868,825
UltraShort Australian Dollar			24,198,507			917,605			—			—			—			25,116,112
UltraShort Euro			437,847,159			—			—			(13,748,507	)		—			424,098,652
UltraShort Yen			558,597,264			—			—			29,386,684			—			587,983,948
Ultra Bloomberg Commodity			2,816,688			—			—			—			15,078			2,831,766
Ultra Bloomberg Crude Oil			137,435,610			626,661			—			—			1,957,893			140,020,164
Ultra Bloomberg Natural Gas			58,921,011			(3,656,539	)		—			—			—			55,264,472
Ultra Gold			140,880,950			(14,560	)		(6,812,974	)		—			—			134,053,416
Ultra Silver			467,868,976			(14,200	)		(2,492,880	)		—			—			465,361,896
Ultra Australian Dollar			2,716,439			(118,220	)		—			—			—			2,598,219
Ultra Euro			2,455,863			—			—			100,962			—			2,556,825
Ultra Yen			2,928,556			—			—			(159,309	)		—			2,769,247
Total Trust		$	2,846,465,825		$	(39,896,568	)	$	(5,900,658	)	$	15,579,830		$	(387,594	)	$	2,815,860,835
*	Includes cumulative appreciation/depreciation of futures contracts as reported in the Schedules of Investments. Only current day’s variation margin is reported within the Statements of Financial Condition in receivable/payable on open futures.
At December 31, 2013, there were no Level III portfolio investments for which significant unobservable inputs were used to determine fair value.
At December 31, 2013, there were no significant transfers in or out of Level I and Level II fair value measurements.
The inputs or methodology used for valuing investments are not necessarily an indication of the risk associated with investing in those securities.
Investment Transactions and Related Income
Investment transactions are recorded on the trade date. All such transactions are recorded on the identified cost basis and marked to market daily. Unrealized appreciation/depreciation on open contracts are reflected in the Statements of Financial Condition and changes in the unrealized appreciation/depreciation between periods are reflected in the Statements of Operations. Discounts on short-term securities purchased are amortized and reflected as Interest Income in the Statements of Operations.
Brokerage Commissions and Fees
Each Fund pays its respective brokerage commissions, including applicable exchange fees, National Futures Association (“NFA”) fees, give-up fees, pit brokerage fees and other transaction related fees and expenses charged in connection with trading activities for each Fund’s investment in U.S. Commodity Futures Trading Commission regulated investments. The effects of trading spreads, financing costs/fees associated with Financial Instruments, and costs relating to the purchase of U.S. Treasury securities or similar high credit quality short-term fixed-income or similar securities would also be borne by the Funds. Brokerage commissions on futures contracts are recognized on a half-turn basis (e.g., the first half is recognized when the contract is purchased (opened) and the second half is recognized when the transaction is closed). For the years ended December 2013 and 2012 and the period from January 1, 2014 through July 30, 2014, the Sponsor paid brokerage commissions on VIX futures contracts for the Matching VIX Funds. On July 31, 2014, the Sponsor began paying, and is currently paying, brokerage commissions on VIX futures contracts for the Matching VIX Funds that exceed variable create/redeem fees collected by more than 0.02% of the Matching VIX Fund’s average net assets annually.
Federal Income Tax
Each Fund is registered as a series of a Delaware statutory trust and is treated as a partnership for U.S. federal income tax purposes. Accordingly, no Fund expects to incur U.S. federal income tax liability; rather, each beneficial owner of a Fund’s Shares is required to take into account its allocable share of its Fund’s income, gain, loss, deductions and other items for its Fund’s taxable year ending with or within the beneficial owner’s taxable year.
Management of the Funds has reviewed all open tax years and major jurisdictions (i.e., 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 will monitor 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 analysis of tax law, regulation, and interpretations thereof.

Investments

Investments	12 Months Ended
	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Investments	NOTE 3 – INVESTMENTS
	Short-Term Investments
	The Funds may purchase U.S. Treasury Bills, agency securities, and other high-credit quality short-term fixed income or similar securities with original maturities of one year or less. A portion of these investments may be posted as collateral in connection with swap agreements and/or used as collateral for a Fund’s trading in futures and forward contracts.
	Accounting for Derivative Instruments
	In seeking to achieve each Fund’s investment objective, the Sponsor uses a mathematical approach to investing. Using this approach, the Sponsor determines the type, quantity and mix of investment positions, including derivative positions, which the Sponsor believes in combination, should produce returns consistent with a Fund’s objective.
	All open derivative positions at period end are reflected on each respective Fund’s Schedule of Investments. Certain Funds utilized a varying level of derivative instruments in conjunction with investment securities in seeking to meet their investment objective during the period. While the volume of open positions may vary on a daily basis as each Fund transacts derivatives contracts in order to achieve the appropriate exposure to meet its investment objective, the volume of these open positions relative to the net assets of each respective Fund at the date of this report is generally representative of open positions throughout the reporting period.
	Following is a description of the derivative instruments used by the Funds during the reporting period, including the primary underlying risk exposures related to each instrument type.
	Futures Contracts
	The Funds enter into futures contracts to gain exposure to changes in the value of, or as a substitute for investing directly in (or shorting), an underlying index, currency or commodity. A futures contract obligates the seller to deliver (and the purchaser to accept) the future delivery of a specified quantity and type of asset at a specified time and place. The contractual obligations of a buyer or seller may generally be satisfied by taking or making physical delivery of the underlying commodity, if applicable, or by making an offsetting sale or purchase of an identical futures contract on the same or linked exchange before the designated date of delivery, or by cash settlement at expiration of contract.
	Upon entering into a futures contract, each Fund is required to deposit and maintain as collateral at least such initial margin as required by the exchange on which the transaction is affected. The initial margin is segregated as cash 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. Pursuant to the futures contract, each Fund generally agrees to receive from or pay to the broker(s) an amount of cash equal to the daily fluctuation in value of the futures contract. Such receipts or payments are known as variation margin and are recorded by each Fund as unrealized gains or losses. Each Fund will realize a gain or loss upon closing of a futures transaction.
	Futures contracts involve, to varying degrees, elements of market risk (specifically commodity price risk or equity market volatility risk) and exposure to loss in excess of the amount of variation margin. The face or contract amounts reflect the extent of the total exposure each Fund has in the particular classes of instruments. Additional risks associated with the use of futures contracts are imperfect correlation between movements in the price of the futures contracts and the market value of the underlying index or commodity and the possibility of an illiquid market for a futures contract. With futures contracts, there is minimal but some counterparty risk to the Funds since futures contracts are exchange-traded and the exchange’s clearinghouse, as counterparty to all exchange-traded futures contracts, guarantees the futures contracts against default. Many futures exchanges and boards of trade limit the amount of fluctuation permitted in futures contract prices during a single trading day. Once the daily limit has been reached in a particular contract, no trades may be made that day at a price beyond that limit or trading may be suspended for specified times during the trading day. Futures contracts prices could move to the limit for several consecutive trading days with little or no trading, thereby preventing prompt liquidation of futures positions and potentially subjecting a Fund to substantial losses. If trading is not possible, or if a Fund determines not to close a futures position in anticipation of adverse price movements, the Fund will be required to make daily cash payments of variation margin. The risk the Fund will be unable to close out a futures position will be minimized by entering into such transactions on a national exchange with an active and liquid secondary market.
	Swap Agreements
	Certain of the Funds enter into swap agreements for purposes of pursuing their investment objectives or as a substitute for investing directly in (or shorting) an underlying index, currency or commodity, or to create an economic hedge against a position. Swap agreements are two-party contracts that have traditionally been entered into primarily with institutional investors in over-the-counter (“OTC”) markets for a specified period, ranging from a day to more than one year. However, the Dodd-Frank Wall Street Reform and Consumer Protection Act (the “Dodd-Frank Act”) provides for significant reforms of the OTC derivative markets, including a requirement to execute certain swap and forward transactions on a CFTC-regulated market and/or to clear such transactions through a CFTC-regulated central clearing organization. In a standard swap transaction, two parties agree to exchange the returns earned or realized on a particular predetermined investment, instrument or index in exchange for a fixed or floating rate of return in respect of a predetermined notional amount. Transaction or commission costs are reflected in the benchmark level at which the transaction is entered into. The gross returns to be exchanged are calculated with respect to a notional amount and the benchmark returns to which the swap is linked. Swap agreements do not involve the delivery of underlying instruments.
	Generally, swap agreements entered into by the Funds calculate and settle the obligations of the parties to the agreement on a “net basis” with a single payment. Consequently, each Fund’s current obligations (or rights) under a swap agreement will generally be equal only to the net amount to be paid or received under the agreement based on the relative values of such obligations (or rights) (the “net amount”). In a typical swap agreement entered into by a Matching VIX Fund or an Ultra Fund, the Matching VIX Fund or Ultra Fund would be entitled to settlement payments in the event the level of the benchmark increases and would be required to make payments to the swap counterparties in the event the level of the benchmark decreases, adjusted for any transaction costs or trading spreads on the notional amount the Funds may pay. In a typical swap agreement entered into by a Short Fund or an UltraShort Fund, the Short Fund or UltraShort Fund would be required to make payments to the swap counterparties in the event the level of the benchmark increases and would be entitled to settlement payments in the event the level of the benchmark decreases, adjusted for any transaction costs or trading spreads on the notional amount the Funds may pay.
	The net amount of the excess, if any, of each Fund’s obligations over its entitlements with respect to each uncleared swap agreement is accrued on a daily basis and an amount of cash and/or securities having an aggregate value at least equal to such accrued excess is maintained for the benefit of the counterparty in a segregated account by the Funds’ Custodian. The net amount of the excess, if any, of each Fund’s entitlements over its obligations with respect to each uncleared swap agreement is accrued on a daily basis and an amount of cash and/or securities having an aggregate value at least equal to such accrued excess is maintained for the benefit of the Fund in a segregated account by the Fund’s Custodian. Until a swap agreement is settled in cash, the gain or loss on the notional amount less any transaction costs or trading spreads payable by each Fund on the notional amount are recorded as “unrealized appreciation or depreciation on swap agreements” and, when cash is exchanged, the gain or loss realized is recorded as “realized gains or losses on swap agreements.” Swap agreements are generally valued at the last settled price of the benchmark referenced asset.
	The Trust, on behalf of a Fund, may enter into agreements with certain counterparties for derivative transactions. These agreements contain various conditions, events of default, termination events, covenants and representations. The triggering of certain events or the default on certain terms of the agreement could allow a party to terminate a transaction under the agreement and request immediate payment in an amount equal to the net positions owed the party under the agreement. This could cause a Fund to have to enter into a new transaction with the same counterparty, enter into a transaction with a different counterparty or seek to achieve its investment objective through any number of different investments or investment techniques.
	Swap agreements involve, to varying degrees, elements of market risk and exposure to loss in excess of the unrealized gain/loss reflected. The notional amounts reflect the extent of the total investment exposure each Fund has under the swap agreement, which may exceed the NAV of each Fund. Additional risks associated with the use of swap agreements are imperfect correlations between movements in the notional amount and the price of the underlying reference index and the inability of counterparties to perform. Each Fund bears the risk of loss of the amount expected to be received under a swap agreement in the event of the default or bankruptcy of a swap agreement counterparty. A Fund will typically enter into swap agreements only with major global financial institutions. The creditworthiness of each of the firms that is a party to a swap agreement is monitored by the Sponsor. The Sponsor may use various techniques to minimize credit risk including early termination and payment, using different counterparties, limiting the net amount due from any individual counterparty and generally requiring collateral to be posted by the counterparty in an amount approximately equal to that owed to the Funds. All of the outstanding swap agreements at December 31, 2014 contractually terminate within one month but may be terminated without penalty by either party daily. Upon termination, the Fund is entitled to pay or receive the “unrealized appreciation or depreciation” amount.
	The Funds, as applicable, collateralize swap agreements by segregating or designating cash and/or certain securities as indicated on the Statements of Financial Condition or Schedules of Investments. As noted above, collateral posted in connection with uncleared derivative transactions is held for the benefit of the counterparty in a segregated tri-party account at the Custodian to protect the counterparty against non-payment by the Funds. In the event of a default by the counterparty, the Funds will seek withdrawal of this collateral from the segregated account and may incur certain costs in exercising its right with respect to the collateral. If a counterparty becomes bankrupt or otherwise fails to perform its obligations due to financial difficulties, the Funds may experience significant delays in obtaining any recovery in a bankruptcy or other reorganizational proceeding. The Funds may obtain only limited recovery or may obtain no recovery in such circumstances.
	The Funds remain subject to credit risk with respect to the amount they expect to receive from counterparties. However, the Funds have sought to mitigate these risks in connection with uncleared swaps by generally requiring that the counterparties for each Fund agree to post collateral for the benefit of the Fund, marked to market daily, in an amount approximately equal to what the counterparty owes the Fund, subject to certain minimum thresholds. In the event of the bankruptcy of a counterparty, the Fund will have direct access to the collateral received from the counterparty, generally as of the day prior to the bankruptcy, because there is a one day time lag between the Fund’s request for collateral and the delivery of such collateral. To the extent any such collateral is insufficient, the Funds will be exposed to counterparty risk as described above, including the possible delays in recovering amounts as a result of bankruptcy proceedings. As of December 31, 2014, the collateral posted by counterparties consisted of cash and/or U.S. Treasury securities.
	The counterparty/credit risk for cleared derivative transactions is generally lower than for uncleared OTC derivatives since generally a clearing organization becomes substituted for each counterparty to a cleared derivative contract and, in effect, guarantees the parties’ performance under the contract as each party to a trade looks only to the clearing organization for performance of financial obligations. In addition, cleared derivative transactions benefit from daily marking-to-market and settlement, and segregation and minimum capital requirements applicable to intermediaries.
	Forward Contracts
	Certain of the Funds enter into forward contracts for purposes of pursuing their investment objectives and as a substitute for investing directly in (or shorting) commodities and/or currencies. A forward contract is an agreement between two parties to purchase or sell a specified quantity of an asset at or before a specified date in the future at a specified price. Forward contracts are typically traded in OTC markets and all details of the contract are negotiated between the counterparties to the agreement. Accordingly, the forward contracts are valued by reference to the contracts traded in the OTC markets.
	The contractual obligations of a buyer or seller may generally be satisfied by taking or making physical delivery of the underlying commodity or currency, establishing an opposite position in the contract and recognizing the profit or loss on both positions simultaneously on the delivery date or, in some instances, paying a cash settlement before the designated date of delivery. The forward contracts are adjusted by the daily fluctuation of the underlying commodity or currency and any gains or losses are recorded for financial statement purposes as unrealized gains or losses until the contract settlement date.
	Forward contracts have traditionally not been cleared or guaranteed by a third party. However, the Dodd-Frank Act provides for significant reforms of the OTC derivatives markets, including a requirement to execute most forward contracts on a CFTC-regulated market and/or to clear such transactions through a CFTC-regulated central clearing organization. The Funds may collateralize uncleared forward commodity contracts by segregating or designating cash and/or certain securities as indicated on their Statements of Financial Condition or Schedules of Investments. Such collateral is held for the benefit of the counterparty in a segregated tri-party account at the Custodian to protect the counterparty against non-payment by the Funds. In the event of a default by the counterparty, the Funds will seek withdrawal of this collateral from the segregated account and may incur certain costs in exercising its right with respect to the collateral. If a counterparty becomes bankrupt or otherwise fails to perform its obligations due to financial difficulties, the Funds may experience significant delays in obtaining any recovery in a bankruptcy or other reorganizational proceeding. The Funds may obtain only limited recovery or may obtain no recovery in such circumstances.
	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, 2014, the collateral posted by counterparties consisted of cash and/or U.S. Treasury securities.
	Participants in trading foreign exchange forward contracts often do not require margin deposits, but rely upon internal credit limitations and their judgments regarding the creditworthiness of their counterparties. In recent years, however, many OTC market participants in foreign exchange trading have begun to require their counterparties to post margin.
	A Fund will typically enter into forward contracts only with major global financial institutions. The creditworthiness of each of the firms that is a party to a forward contract is monitored by the Sponsor.
	The counterparty/credit risk for cleared derivative transactions is generally lower than for uncleared OTC derivatives since generally a clearing organization becomes substituted for each counterparty to a cleared derivative contract and, in effect, guarantees the parties’ performance under the contract as each party to a trade looks only to the clearing organization for performance of financial obligations. In addition, cleared derivative transactions benefit from daily marking-to-market and settlement, and segregation and minimum capital requirements applicable to intermediaries.
	Fair Value of Derivative Instruments
	as of December 31, 2014
	Asset Derivatives								Liability Derivatives
	Derivatives not		Statements of		Fund	Unrealized			Statements of		Fund	Unrealized
	accounted for as		Financial			Appreciation			Financial			Depreciation
	hedging instruments		Condition						Condition
			Location						Location
	Managed Futures Contracts		Receivables on open futures contracts		ProShares Managed Futures Strategy	$	122,831	*	Payable on open futures contracts		ProShares Managed Futures Strategy	$	18,504	*
	VIX Futures Contracts		Receivables on open futures contracts		ProShares VIX Short-Term Futures ETF		6,264,620	*			ProShares VIX Mid-Term Futures ETF		222,845	*
					ProShares VIX Mid-Term Futures ETF		483,510	*			ProShares Short VIX Short-Term ETF		16,352,149	*
					ProShares Ultra VIX Short-Term Futures ETF		39,585,253	*
	Commodities Contracts		Receivables on open futures contracts, unrealized appreciation on swap and/or forward agreements		ProShares UltraShort Bloomberg Commodity		567,259		Payable on open futures contracts, unrealized depreciation on swap and/or forward agreements		ProShares UltraShort Gold		2,287,298	*
					ProShares UltraShort Bloomberg Crude Oil		42,824,680	*			ProShares UltraShort Silver		204,570
					ProShares UltraShort Bloomberg Natural Gas		3,941,465	*			ProShares Ultra Bloomberg Commodity		331,338
					ProShares UltraShort Silver		801,083	*			ProShares Ultra Bloomberg Crude Oil		122,655,884	*
					ProShares Ultra Gold		2,055,734	*			ProShares Ultra Bloomberg Natural Gas		34,889,283	*
											ProShares Ultra Silver		12,396,680	*
	Foreign Exchange Contracts		Unrealized appreciation on foreign currency forward contracts and receivables on open futures contracts		ProShares Short Euro		385,331	*	Unrealized depreciation on foreign currency forward contracts and payable on open futures contracts		ProShares UltraShort Euro		2,256,771
					ProShares UltraShort Australian Dollar		743,481	*			ProShares UltraShort Yen		2,149,924
					ProShares UltraShort Euro		19,019,765				ProShares Ultra Australian Dollar		96,825	*
					ProShares UltraShort Yen		571,149				ProShares Ultra Euro		106,292
					ProShares Ultra Euro		2,921				ProShares Ultra Yen
					ProShares Ultra Yen		404						15,649
					Total Trust	$	117,369,486	*			Total Trust	$	193,984,012	*
	*	Includes cumulative appreciation/depreciation of futures contracts as reported in the Schedules of Investments. Only current day’s variation margin is reported within the Statements of Financial Condition in receivable/payable on open futures contracts.
	Fair Value of Derivative Instruments
	as of December 31, 2013
	Asset Derivatives								Liability Derivatives
	Derivatives not		Statements of		Fund	Unrealized			Statements of		Fund	Unrealized
	accounted for as		Financial			Appreciation			Financial			Depreciation
	hedging instruments		Condition						Condition
			Location						Location
	VIX Futures Contracts		Receivables on open futures contracts		ProShares Short VIX Short-Term Futures ETF	$	8,116,955	*	Payable on open futures contracts		ProShares VIX Short-Term Futures ETF	$	16,652,686	*
											ProShares VIX Mid-Term Futures ETF		4,896,689	*
											ProShares Ultra VIX Short-Term Futures ETF		24,009,911	*
	Commodities Contracts		Receivables on open futures contracts, unrealized appreciation on swap and/or forward agreements		ProShares UltraShort Bloomberg Natural Gas		1,042,300	*	Payable on open futures contracts, unrealized depreciation on swap and/or forward agreements		ProShares UltraShort Bloomberg Commodity		27,665
				ProShares UltraShort Gold		5,647,573	*			ProShares UltraShort Bloomberg Crude Oil		3,565,673	*
				ProShares UltraShort Silver		14,200	*
										ProShares UltraShort Silver		2,227,857
				ProShares Ultra Bloomberg Commodity		15,078				ProShares Ultra Bloomberg Natural Gas		3,656,539	*
				ProShares Ultra Bloomberg Crude Oil		2,584,554	*			ProShares Ultra Gold		6,827,534	*
										ProShares Ultra Silver		2,507,080	*
Foreign Exchange Contracts		Unrealized appreciation on foreign currency forward contracts and receivables on open futures contracts		ProShares UltraShort Australian Dollar		917,605	*	Unrealized depreciation on foreign currency forward contracts and payable on open futures contracts		ProShares Short Euro		33,231	*
				ProShares UltraShort Euro		151,351				ProShares UltraShort Euro		13,899,858
				ProShares UltraShort Yen		31,317,568				ProShares UltraShort Yen		1,930,884
				ProShares Ultra Euro		120,908				ProShares Ultra Australian Dollar		118,220	*
				ProShares Ultra Yen		4,052				ProShares Ultra Euro		19,946
										ProShares Ultra Yen		163,361
				Total Trust	$	49,932,144	*			Total Trust	$	80,537,134	*
*	Includes cumulative appreciation/depreciation of futures contracts as reported in the Schedules of Investments. Only current day’s variation margin is reported within the Statements of Financial Condition in receivable/payable on open futures contracts.
The Effect of Derivative Instruments on the Statements of Operations
For the year ended December 31, 2014
Derivatives not accounted for as		Location of Gain or		Fund	Realized Gain			Change in
hedging instruments		(Loss) on Derivatives			or (Loss) on			Unrealized
		Recognized in Income			Derivatives			Appreciation or
					Recognized in			Depreciation on
					Income			Derivatives
								Recognized in
								Income
Managed Futures Contracts		Net realized gain (loss) on futures contracts / changes in unrealized appreciation/ depreciation on futures contracts		ProShares Managed Futures Strategy	$	109,006		$	104,327
VIX Futures Contracts		Net realized gain (loss) on futures contracts / changes in unrealized appreciation/ depreciation on futures contracts		ProShares VIX Short-Term Futures ETF		(694,347	)		22,917,306
				ProShares VIX Mid-Term Futures ETF		(14,378,810	)		5,157,354
				ProShares Short VIX Short-Term Futures ETF		76,925,998			(24,469,104	)
				ProShares Ultra VIX Short-Term Futures ETF		(139,412,525	)		63,595,164
Commodity Contracts		Net realized gain (loss) on futures contracts, swap and/or forward agreements/changes in unrealized appreciation/ depreciation on futures contracts, swap and/or forward agreements		ProShares UltraShort Bloomberg Commodity		906,309			594,924
				ProShares UltraShort Bloomberg Crude Oil		99,327,097			46,390,353
				ProShares UltraShort Bloomberg Natural Gas		8,791,719			2,899,165
				ProShares UltraShort Gold		(5,316,482	)		(7,934,871	)
				ProShares UltraShort Silver		15,114,883			2,810,170
				ProShares Ultra Bloomberg Commodity		(1,065,622	)		(346,416	)
				ProShares Ultra Bloomberg Crude Oil		(243,325,957	)		(125,240,438	)
				ProShares Ultra Bloomberg Natural Gas		(6,464,796	)		(31,232,744	)
				ProShares Ultra Gold		(9,674,333	)		8,883,268
				ProShares Ultra Silver		(155,551,420	)		(9,889,600	)
Foreign Exchange Contracts		Net realized gain (loss) on futures contracts and/or foreign currency forward contracts/changes in unrealized appreciation/ depreciation on futures contracts and/or foreign currency forward contracts		ProShares Short Euro		1,593,048			418,562
				ProShares UltraShort Australian Dollar		2,296,216			(174,124	)
				ProShares UltraShort Euro		83,678,955			30,511,501
				ProShares UltraShort Yen		127,846,225			(30,965,459	)
				ProShares Ultra Australian Dollar		(417,873	)		21,395
				ProShares Ultra Euro		(420,533	)		(204,333	)
				ProShares Ultra Yen		(540,398	)		144,064
				Total Trust	$	(160,673,640	)	$	(46,009,536	)
The Effect of Derivative Instruments on the Statements of Operations
For the year ended December 31, 2013
Derivatives not accounted for as		Location of Gain or		Fund	Realized Gain			Change in
hedging instruments		(Loss) on Derivatives			or (Loss) on			Unrealized
		Recognized in Income			Derivatives			Appreciation or
					Recognized in			Depreciation on
					Income			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 VIX Short-Term Futures ETF	$	(144,618,136	)	$	(16,431,267	)
				ProShares VIX Mid-Term Futures ETF		(28,219,863	)		(3,426,279	)
				ProShares Short VIX Short-Term Futures ETF		87,175,105			9,504,130
				ProShares Ultra VIX Short-Term Futures ETF		(405,816,676	)		(26,368,324	)
Commodity Contracts		Net realized gain (loss) on futures contracts, swap and/or forward agreements/changes in unrealized appreciation/ depreciation on futures contracts, swap and/or forward agreements		ProShares UltraShort Bloomberg Commodity		760,002			(176,167	)
				ProShares UltraShort Bloomberg Crude Oil		(12,304,999	)		6,071,108
				ProShares UltraShort Bloomberg Natural Gas		(2,585,514	)		633,165
				ProShares UltraShort Gold		61,124,409			1,902,477
				ProShares UltraShort Silver		113,456,404			(21,561,362	)
				ProShares Ultra Bloomberg Commodity		(1,254,251	)		321,346
				ProShares Ultra Bloomberg Crude Oil		120,745,948			(52,709,476	)
				ProShares Ultra Bloomberg Natural Gas		41,418,165			160,411
				ProShares Ultra Gold		(165,632,786	)		8,839,764
				ProShares Ultra Silver		(701,532,729	)		143,273,646
Foreign Exchange Contracts		Net realized gain (loss) on futures contracts and/or foreign currency forward contracts/changes in unrealized appreciation/ depreciation on futures contracts and/or foreign currency forward contracts		ProShares Short Euro		(381,987	)		21,825
				ProShares UltraShort Australian Dollar		2,720,079			832,015
				ProShares UltraShort Euro		(48,063,036	)		(600,935	)
				ProShares UltraShort Yen		164,019,598			(8,727,491	)
				ProShares Ultra Australian Dollar		(928,022	)		(19,190	)
				ProShares Ultra Euro		210,150			13,803
				ProShares Ultra Yen		(1,879,169	)		334,987
				Total Trust	$	(921,587,308	)	$	41,888,186
The Effect of Derivative Instruments on the Statements of Operations
For the year ended December 31, 2012
Derivatives not accounted for as		Location of Gain or		Fund	Realized Gain			Change in
hedging instruments		(Loss) on Derivatives			or (Loss) on			Unrealized
		Recognized in Income			Derivatives			Appreciation or
					Recognized in			Depreciation on
					Income			Derivatives
								Recognized in
								Income
VIX Futures 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 VIX Short-Term Futures ETF	$	(160,953,587	)	$	1,354,551
				ProShares VIX Mid-Term Futures ETF		(75,241,919	)		4,642,340
				ProShares Short VIX Short-Term Futures ETF		13,203,419			(1,477,355	)
				ProShares Ultra VIX Short-Term Futures ETF		(509,421,864	)		3,121,203
Commodity Contracts		Net realized gain (loss) on futures contracts, swap and/or forward agreements/changes in unrealized appreciation/ depreciation on futures contracts, swap and/or forward agreements		ProShares UltraShort Bloomberg Commodity		761,879			(422,249	)
				ProShares UltraShort Bloomberg Crude Oil		47,564,763			(12,529,061	)
				ProShares UltraShort Bloomberg Natural Gas		1,212,600			(971,875	)
				ProShares UltraShort Gold		(10,067,498	)		(29,698,062	)
				ProShares UltraShort Silver		(28,114,972	)		(23,728,868	)
				ProShares Ultra Bloomberg Commodity		(536,107	)		400,909
				ProShares Ultra Bloomberg Crude Oil		(84,061,967	)		66,666,756
				ProShares Ultra Bloomberg Natural Gas		(2,839,309	)		(2,991,440	)
				ProShares Ultra Gold		(33,592,896	)		65,210,642
				ProShares Ultra Silver		(66,426,492	)		33,606,897
Foreign Exchange Contracts		Net realized gain (loss) on futures contracts and/or foreign currency forward contracts/changes in unrealized appreciation/ depreciation on futures contracts and/or foreign currency forward contracts		ProShares Short Euro		(164,400	)		(55,056	)
				ProShares UltraShort Australian Dollar		(288,740	)		85,590
				ProShares UltraShort Euro		46,946,419			(80,578,526	)
				ProShares UltraShort Yen		27,341,631			42,478,321
				ProShares Ultra Australian Dollar		265,990			(99,030	)
				ProShares Ultra Euro		(398,504	)		605,371
				ProShares Ultra Yen		(601,937	)		(597,023	)
				Total Trust	$	(835,413,491	)	$	65,024,035
Offsetting Assets and Liabilities
The Funds are subject to master netting agreements or similar arrangements that allow for amounts owed between the Funds 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, 2014 and December 31, 2013:
Fair Values of Derivative Instruments as of December 31, 2014
		Assets									Liabilities
		Gross			Gross			Net Amounts of			Gross			Gross		Net Amounts of
		Amounts of			Amounts			Assets			Amounts of			Amounts		Liabilities
		Recognized			Offset in the			presented in			Recognized			Offset in the		presented in
		Assets			Statements			the Statements			Liabilities			Statements		the Statements
		presented in			of Financial			of Financial			presented in			of Financial		of Financial
		the Statements			Condition			Condition			the Statements			Condition		Condition
		of Financial									of Financial
		Condition									Condition
ProShares UltraShort Bloomberg Commodity
Swap agreements			567,259			—			567,259			—			—		—
ProShares UltraShort Bloomberg Crude Oil
Swap agreements			27,018,077			—			27,018,077			—			—		—
ProShares UltraShort Gold
Forward agreements			—			—			—			2,282,778			—		2,282,778
ProShares UltraShort Silver
Forward agreements			799,523			—			799,523			204,570			—		204,570
ProShares UltraShort Euro
Foreign currency forward contracts			19,019,765			—			19,019,765			2,256,771			—		2,256,771
ProShares UltraShort Yen
Foreign currency forward contracts			571,149			—			571,149			2,149,924			—		2,149,924
ProShares Ultra Bloomberg Commodity
Swap agreements			—			—			—			331,338			—		331,338
ProShares Ultra Bloomberg Crude Oil
Swap agreements			—			—			—			76,181,097			—		76,181,097
ProShares Ultra Gold
Forward agreements			2,051,154			—			2,051,154			—			—		—
ProShares Ultra Silver
Forward agreements			—			—			—			12,395,120			—		12,395,120
ProShares Ultra Euro
Foreign currency forward contracts			2,921			—			2,921			106,292			—		106,292
ProShares Ultra Yen
Foreign currency forward contracts			404			—			404			15,649			—		15,649
Asset (Liability) amounts shown in the table below represent amounts owed to (by) the Funds for the derivative-related investments at December 31, 2014. 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 due to timing differences related to market movements or due to minimum thresholds for collateral movement, as further described above under the caption “Accounting for Derivative Instruments”.
Gross Amounts Not Offset in the Statement of Financial Condition
		Amounts of			Financial			Cash Collateral			Net Amount
		Recognized			Instruments for			for the Benefit of
		Assets /			the Benefit of			(the Funds) / the
		(Liabilities)			(the Funds) / the			Counterparties
		presented in the			Counterparties
		Statements of
		Financial
		Condition
ProShares UltraShort Bloomberg Commodity
Deutsche Bank AG			243,474			—			—			243,474
Goldman Sachs International			240,271			—			—			240,271
UBS AG			83,514			—			—			83,514
ProShares UltraShort Bloomberg Crude Oil
Deutsche Bank AG			7,669,493			—			(6,800,000	)		869,493
Goldman Sachs International			8,362,336			(7,598,657	)		—			763,679
Societe Generale S.A.			2,132,657			(2,132,657	)		—			—
UBS AG			8,853,591			(8,281,350	)		—			572,241
ProShares UltraShort Gold
Deutsche Bank AG			(1,422,997	)		1,422,997			—			—
Goldman Sachs International			(354,660	)		354,660			—			—
Societe Generale S.A.			(182,225	)		182,225			—			—
UBS AG			(322,896	)		322,896			—			—
ProShares UltraShort Silver
Deutsche Bank AG			462,619			—			(462,619	)		—
Goldman Sachs International			138,563			(138,563	)		—			—
Societe Generale S.A.			198,341			(198,341	)		—			—
UBS AG			(204,570	)		204,570			—			—
ProShares UltraShort Euro
Goldman Sachs International			8,193,303			(6,008,925	)		—			2,184,378
UBS AG			8,569,691			(6,592,366	)		(11,518	)		1,965,807
ProShares UltraShort Yen
Goldman Sachs International			(1,466,239	)		1,466,239			—			—
UBS AG			(112,536	)		112,536			—			—
ProShares Ultra Bloomberg Commodity
Deutsche Bank AG			(143,751	)		143,751			—			—
Goldman Sachs International			(138,532	)		138,532			—			—
UBS AG			(49,055	)		49,055			—			—
ProShares Ultra Bloomberg Crude Oil
Deutsche Bank AG			(24,223,667	)		24,223,667			—			—
Goldman Sachs International			(24,285,701	)		24,285,701			—			—
Societe Generale S.A.			(5,528,160	)		5,528,160			—			—
UBS AG			(22,143,569	)		22,143,569			—			—
ProShares Ultra Gold
Deutsche Bank AG			1,231,694			—			(1,231,694	)		—
Goldman Sachs International			222,126			—			—			222,126
Societe Generale S.A.			190,591			(190,591	)		—			—
UBS AG			406,743			(406,743	)		—			—
ProShares Ultra Silver
Deutsche Bank AG			(6,220,069	)		6,220,069			—			—
Goldman Sachs International			(2,124,796	)		2,124,796			—			—
Societe Generale S.A.			(1,384,207	)		1,384,207			—			—
UBS AG			(2,666,048	)		2,666,048			—			—
ProShares Ultra Euro
Goldman Sachs International			(38,856	)		38,856			—			—
UBS AG			(64,515	)		64,515			—			—
ProShares Ultra Yen
Goldman Sachs International			(12,255	)		12,255			—			—
UBS AG			(2,990	)		2,990			—			—
Fair Values of Derivative Instruments as of December 31, 2013
		Assets									Liabilities
		Gross			Gross			Net Amounts of			Gross			Gross		Net Amounts of
		Amounts of			Amounts			Assets			Amounts of			Amounts		Liabilities
		Recognized			Offset in the			presented in			Recognized			Offset in the		presented in
		Assets			Statements of			the Statements			Liabilities			Statements		the Statements
		presented in			Financial			of Financial			presented in			of Financial		of Financial
		the Statements			Condition			Condition			the Statements			Condition		Condition
		of Financial									of Financial
		Condition									Condition
ProShares UltraShort Bloomberg Commodity
Swap agreements			—			—			—			27,665			—		27,665
ProShares UltraShort Bloomberg Crude Oil
Swap agreements			—			—			—			2,332,900			—		2,332,900
ProShares UltraShort Gold
Forward agreements			5,633,053			—			5,633,053			—			—		—
ProShares UltraShort Silver
Forward agreements			—			—			—			2,227,857			—		2,227,857
ProShares UltraShort Euro
Foreign currency forward contracts			151,351			—			151,351			13,899,858			—		13,899,858
ProShares UltraShort Yen
Foreign currency forward contracts			31,317,568			—			31,317,568			1,930,884			—		1,930,884
ProShares Ultra Bloomberg Commodity
Swap agreements			15,078			—			15,078			—			—		—
ProShares Ultra Bloomberg Crude Oil
Swap agreements			1,957,893			—			1,957,893			—			—		—
ProShares Ultra Gold
Forward agreements			—			—			—			6,812,974			—		6,812,974
ProShares Ultra Silver
Forward agreements			—			—			—			2,492,880			—		2,492,880
ProShares Ultra Euro
Foreign currency forward contracts			120,908			—			120,908			19,946			—		19,946
ProShares Ultra Yen
Foreign currency forward contracts			4,052			—			4,052			163,361			—		163,361
Asset (Liability) amounts shown in the table below represent amounts owed to (by) the Funds for the derivative-related investments at December 31, 2013. 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 un-collateralized portions of these amounts at period end. These amounts may be un-collateralized due to timing differences related to market movements or due to minimum thresholds for collateral movement, as further described above under the caption “Accounting for Derivative Instruments”.
Gross Amounts Not Offset in the Statement of Financial Condition
		Amounts of			Financial			Cash Collateral			Net Amount
		Recognized			Instruments for			for the Benefit of
		Assets /			the Benefit of			(the Funds) / the
		(Liabilities)			(the Funds) / the			Counterparties
		presented in the			Counterparties
		Statements of
		Financial
		Condition
ProShares UltraShort Bloomberg Commodity
Deutsche Bank AG			(11,710	)		11,710			—			—
Goldman Sachs International			(12,945	)		12,945			—			—
UBS AG			(3,010	)		3,010			—			—
ProShares UltraShort Bloomberg Crude Oil
Deutsche Bank AG			(570,114	)		570,114			—			—
Goldman Sachs International			(632,990	)		632,990			—			—
Societe Generale S.A.			(402,586	)		402,586			—			—
UBS AG			(727,210	)		727,210			—			—
ProShares UltraShort Gold
Deutsche Bank AG			2,258,281			—			(2,258,281	)		—
Goldman Sachs International			1,411,290			(1,411,290	)		—			—
Societe Generale S.A.			665,044			(665,044	)		—			—
UBS AG			1,298,438			(1,298,438	)		—			—
ProShares UltraShort Silver
Deutsche Bank AG			(445,752	)		445,752			—			—
Goldman Sachs International			(1,257,636	)		1,257,636			—			—
Societe Generale S.A.			(7,359	)		7,359			—			—
UBS AG			(517,110	)		517,110			—			—
ProShares UltraShort Euro
Goldman Sachs International			(6,756,698	)		6,756,698			—			—
UBS AG			(6,991,809	)		6,991,809			—			—
ProShares UltraShort Yen
Goldman Sachs International			14,831,469			(12,750,577	)		—			2,080,892
UBS AG			14,555,215			(12,958,891	)		—			1,596,324
ProShares Ultra Bloomberg Commodity
Deutsche Bank AG			6,454			—			—			6,454
Goldman Sachs International			4,974			—			—			4,974
UBS AG			3,650			—			—			3,650
ProShares Ultra Bloomberg Crude Oil
Deutsche Bank AG			622,117			—			(622,117	)		—
Goldman Sachs International			576,723			(576,723	)		—			—
Societe Generale S.A.			275,816			(275,816	)		—			—
UBS AG			483,237			(483,237	)		—			—
ProShares Ultra Gold
Deutsche Bank AG			(3,543,937	)		3,543,937			—			—
Goldman Sachs International			(1,327,335	)		1,327,335			—			—
Societe Generale S.A.			(785,038	)		785,038			—			—
UBS AG			(1,156,664	)		1,156,664			—			—
ProShares Ultra Silver
Deutsche Bank AG			(350,663	)		350,663			—			—
Goldman Sachs International			(1,345,433	)		1,345,433			—			—
Societe Generale S.A.			(28,581	)		28,581			—			—
UBS AG			(768,203	)		768,203			—			—
ProShares Ultra Euro
Goldman Sachs International			37,221			—			—			37,221
UBS AG			63,741			—			—			63,741
ProShares Ultra Yen
Goldman Sachs International			(75,847	)		75,847			—			—
UBS AG			(83,462	)		83,462			—			—

Agreements

Agreements	12 Months Ended
	Dec. 31, 2014
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 Managed Futures Fund will pay the Sponsor a Management Fee, monthly in arrears, in an amount equal to 0.75% per annum of its average daily net assets. The Sponsor did not and will not charge its fee in the first year of operation of each Fund in an amount equal to the offering costs. The Sponsor reimbursed each Fund, to the extent that its offering costs exceed the Management Fee, for the first year of operations. The Management Fee is paid in consideration of the Sponsor’s services as commodity pool operator, and for managing the business and affairs of the Funds. From the Management Fee, the Sponsor pays all of the routine operational, administrative and other ordinary expenses of each Fund, generally as determined by the Sponsor, including but not limited to the Administrator, Custodian, Distributor, ProFunds Distributors, Inc. (“PDI”), an affiliated broker-dealer of the Sponsor, Transfer Agent, accounting and auditing fees and expenses, any index licensors for the Funds, and the normal and expected expenses incurred in connection with the continuous offering of Shares of each Fund after the commencement of its trading operations, including, but not limited to, expenses such as tax preparation expenses, legal fees not in excess of $100,000 per annum, ongoing SEC registration fees not exceeding 0.021% per annum of the NAV of a Fund and Financial Industry Regulatory Authority (“FINRA”) filing fees, individual Schedule K-1 preparation and mailing fees not exceeding 0.10% per annum of the net assets of a Fund, and report preparation and mailing expenses. Each Fund incurs and pays its non-recurring and unusual fees and expenses, if any, as determined by the Sponsor. Non-recurring and unusual fees and expenses are fees and expenses which are unexpected or unusual in nature, such as legal claims and liabilities, litigation costs or indemnification or other material expenses which are not currently anticipated obligations of the Funds. Such fees and expenses are those that are non-recurring, unexpected or unusual in nature.
	The Administrator
	The Sponsor and the Trust, for itself and on behalf of each Fund, has appointed Brown Brothers Harriman & Co. (“BBH&Co.”) as the Administrator of the Funds, and the Sponsor, and the Trust, on its own behalf and on behalf of each Fund, and BBH&Co. have entered into an Administrative Agency Agreement (the “Administration Agreement”) in connection therewith. Pursuant to the terms of the Administration Agreement and under the supervision and direction of the Sponsor and the Trust, BBH&Co. prepares and files certain regulatory filings on behalf of the Funds. BBH&Co. may also perform other services for the Funds pursuant to the Administration Agreement as mutually agreed upon by the Sponsor, the Trust and BBH&Co. from time to time. Pursuant to the terms of the Administration Agreement, BBH&Co. also serves as the Transfer Agent of the Funds. The Administrator’s fees are paid on behalf of the Funds by the Sponsor.
	The Custodian
	BBH&Co. serves as the Custodian of the Funds, and the Trust, on its own behalf and on behalf of each Fund, and BBH&Co. have entered into a Custodian Agreement in connection therewith. Pursuant to the terms of the Custodian Agreement, BBH&Co. is responsible for the holding and safekeeping of assets delivered to it by the Funds, and performing various administrative duties in accordance with instructions delivered to BBH&Co. by the Funds. The Custodian’s fees are paid on behalf of the Funds by the Sponsor.
	The Distributor
	SEI Investments Distribution Co. (“SEI”), serves as Distributor of the Funds and assists the Sponsor and the Administrator with certain functions and duties relating to distribution and marketing, including taking creation and redemption orders, consulting with the marketing staff of the Sponsor and its affiliates with respect to compliance with the requirements of FINRA and/or the NFA in connection with marketing efforts, and reviewing and filing of marketing materials with FINRA and/or the NFA. SEI retains all marketing materials separately for each Fund, at c/o SEI, One Freedom Valley Drive, Oaks, PA 19456. The Sponsor, on behalf of each Fund, has entered into a Distribution Services Agreement with SEI.

Offering_Costs

Offering Costs	12 Months Ended
	Dec. 31, 2014
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 did not and will not charge its Management Fee in the first year of operations of the Ultra Australian Dollar Fund, UltraShort Australian Dollar Fund, Short Euro Fund and the Managed Futures Fund in an amount equal to the offering costs. The Sponsor reimbursed each Fund, with the exception of each Matching VIX Fund and the Managed Futures Fund, to the extent that its offering costs exceeded 0.95% of its average daily NAV for the first year of operations. The Sponsor reimbursed each Matching VIX Fund to the extent its offering costs exceeded 0.85% of its average daily NAV for the first year of operations. The Sponsor will reimburse the Managed Futures Fund to the extent its offering costs exceed 0.75% of its average daily NAV for the first year of operations. Normal and expected expenses incurred in connection with the continuous offering of Shares of the Managed Futures Fund after the commencement of its trading operations will be paid by the Sponsor.

Creation_and_Redemption_of_Cre

Creation and Redemption of Creation Units	12 Months Ended
	Dec. 31, 2014
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 the Managed Futures Fund and 25,000 Shares of a Matching VIX Fund. Creation Units may be created or redeemed only by Authorized Participants. As a result of the Share splits and reverse Share splits as described in Note 1, certain redemptions as disclosed in the Statements of Changes in Shareholders’ Equity reflect payment of fractional share balances on beneficial shareholder accounts.
	Except when aggregated in Creation Units, the Shares are not redeemable securities. Retail investors, therefore, generally will not be able to purchase or redeem Shares directly from or with a Fund. Rather, most retail investors will purchase or sell Shares in the secondary market with the assistance of a broker. Thus, some of the information contained in these Notes to Financial Statements—such as references to the Transaction Fees imposed on purchases and redemptions—is not relevant to retail investors.
	Transaction Fees on Creation and Redemption Transactions
	The manner by which Creation Units are purchased or redeemed is dictated by the terms of the Authorized Participant Agreement and Authorized Participant Handbook. By placing a purchase order, an Authorized Participant agrees to: (1) deposit cash with the Custodian; and (2) if permitted by the Sponsor in its sole discretion, enter into or arrange for an exchange of futures contract for related position or block trade whereby the Authorized Participant would also transfer to such Fund a number and type of exchange-traded futures contracts at or near the closing settlement price for such contracts on the purchase order date.
	Authorized Participants may pay a fixed transaction fee of up to $500 in connection with each order to create or redeem a Creation Unit in order to compensate BBH&Co., as the Administrator, the Custodian and the Transfer Agent of each Fund and its Shares, for services in processing the creation and redemption of Creation Units and to offset the costs of increasing or decreasing derivative positions. Authorized Participants also may pay a variable transaction fee to the Fund of up to 0.10% (and a variable transaction fee to the Matching VIX Funds of 0.05%) of the value of the Creation Unit that is purchased or redeemed unless the transaction fee is waived or otherwise adjusted by the Sponsor. The Sponsor provides such Authorized Participant with prompt notice in advance of any such waiver or adjustment of the transaction fee. Authorized Participants may sell the Shares included in the Creation Units they purchase from the Funds to other investors in the secondary market.
	Transaction fees for the years ended December 31, 2014, 2013 and 2012, which are included in the Sale and/or Redemption of Shares on the Statements of Changes in Shareholders’ Equity, were as follows:
	Fund		Year Ended		Year Ended		Year Ended
			December 31, 2014		December 31, 2013		December 31, 2012
	Managed Futures Strategy*		$	—	$	—	$	—
	VIX Short-Term Futures ETF			72,020		—		—
	VIX Mid-Term Futures ETF			8,927		—		—
	Short VIX Short-Term Futures ETF			218,121		130,779		119,942
	Ultra VIX Short-Term Futures ETF			734,298		814,195		639,726
	UltraShort Bloomberg Commodity			—		—		1,344
	UltraShort Bloomberg Crude Oil			257,458		298,261		120,983
	UltraShort Bloomberg Natural Gas			26,053		7,434		6,200
	UltraShort Gold			32,473		105,508		15,695
	UltraShort Silver			48,832		128,850		148,662
	Short Euro**			—		—		—
	UltraShort Australian Dollar***			—		—		—
	UltraShort Euro			—		—		—
	UltraShort Yen			—		—		—
	Ultra Bloomberg Commodity			249		487		603
	Ultra Bloomberg Crude Oil			299,493		236,956		317,803
	Ultra Bloomberg Natural Gas			30,073		42,172		19,179
	Ultra Gold			12,088		23,035		26,057
	Ultra Silver			65,208		107,285		164,212
	Ultra Australian Dollar***			—		—		—
	Ultra Euro			—		—		—
	Ultra Yen			—		—		—
	Total Trust		$	1,805,293	$	1,894,962	$	1,580,406
	*	Fund commenced investment operations on October 1, 2014.
	**	Fund commenced investment operations on June 26, 2012.
	***	Fund commenced investment operations on July 17, 2012.

Financial_Highlights

Financial Highlights	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Financial Highlights	NOTE 7 – FINANCIAL HIGHLIGHTS
	Selected data for a Share outstanding throughout the year ended December 31, 2014:
	For the Year Ended December 31, 2014
	Per Share Operating Performance		Managed			VIX Short-			VIX Mid-			Short VIX			Ultra VIX			UltraShort			UltraShort
			Futures			Term Futures			Term Futures			Short-Term			Short-Term			Bloomberg			Bloomberg
			Strategy+			ETF			ETF*			Futures ETF			Futures ETF			Commodity			Crude Oil
	Net asset value, beginning of period		$	20		$	28.5387		$	77.1837		$	67.4993		$	67.0841		$	63.2936		$	31.7301
	Net investment income (loss)			(0.0417	)		(0.2047	)		(0.5666	)		(1.0247	)		(0.5811	)		(0.5679	)		(0.2773	)
	Net realized and unrealized gain (loss)#			1.1771			(7.4019	)		(13.0151	)		(5.0742	)		(41.4112	)		25.0238			46.5262
	Change in net asset value from operations			1.1354			(7.6066	)		(13.5817	)		(6.0989	)		(41.9923	)		24.4559			46.2489
	Net asset value, at December 31, 2014		$	21.1354		$	20.9321		$	63.602		$	61.4004		$	25.0918		$	87.7495		$	77.979
	Market value per share, at December 31, 2013†		$	—		$	28.53		$	77.16		$	67.47		$	67.12		$	58.41		$	31.58
	Market value per share, at December 31, 2014†		$	21.28		$	20.99		$	63.89		$	61.16		$	25.15		$	87.44		$	76.52
	Total Return, at net asset value			5.7	%^		(26.7	)%		(17.6	)%		(9.0	)%		(62.6	)%		38.6	%		145.8	%
	Total Return, at market value			6.4	%^		(26.4	)%		(17.2	)%		(9.4	)%		(62.5	)%		49.7	%		142.3	%
	Ratios to Average Net Assets
	Expense ratio			(0.82	)%**		(0.92	)%		(0.87	)%		(1.49	)%		(1.80	)%		(0.95	)%		(0.98	)%
	Expense ratio, excluding brokerage commissions			(0.75	)%**		(0.85	)%		(0.85	)%		(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%
	Net investment income (loss)			(0.82	)%**		(0.88	)%		(0.84	)%		(1.46	)%		(1.78	)%		(0.92	)%		(0.94	)%
	*	See Note 1 of these Notes to Financial Statements.
	+	From commencement of operations, October 1, 2014, through December 31, 2014.
	#	The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period.
	†	Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds’ net asset value is calculated.
	^	Percentages are not annualized for the period ended December 31, 2014. The return for a share outstanding for 2014 is calculated based on the initial offering price upon commencement of investment operations of $20.0000 for ProShares Managed Futures Strategy.
	**	Percentages are annualized.
	For the Year Ended December 31, 2014
	Per Share Operating Performance		UltraShort			UltraShort			UltraShort			Short Euro			UltraShort			UltraShort			UltraShort
			Bloomberg			Gold			Silver						Australian			Euro			Yen
			Natural Gas												Dollar
	Net asset value, at December 31, 2013		$	69.9635		$	103.518		$	89.782		$	35.5867		$	46.6384		$	17.0613		$	70.864
	Net investment income (loss)			(0.4961	)		(0.8233	)		(0.7875	)		(0.3428	)		(0.4272	)		(0.1642	)		(0.6412	)
	Net realized and unrealized gain (loss)#			14.4903			(6.0431	)		26.6198			4.8178			5.1678			4.6975			19.1108
	Change in net asset value from operations			13.9942			(6.8664	)		25.8323			4.475			4.7406			4.5333			18.4696
	Net asset value, at December 31, 2014		$	83.9577		$	96.6516		$	115.6143		$	40.0617		$	51.379		$	21.5946		$	89.3336
	Market value per share, at December 31, 2013†		$	69.36		$	103.53		$	90.19		$	35.66		$	46.66		$	17.06		$	70.91
	Market value per share, at December 31, 2014†		$	82.03		$	100.22		$	119.39		$	40.03		$	51.37		$	21.61		$	89.3
	Total Return, at net asset value			20	%		(6.6	)%		28.8	%		12.6	%		10.2	%		26.6	%		26.1	%
	Total Return, at market value			18.3	%		(3.2	)%		32.4	%		12.3	%		10.1	%		26.7	%		25.9	%
	Ratios to Average Net Assets
	Expense ratio			(1.18	)%		(0.95	)%		(0.95	)%		(0.96	)%		(1.01	)%		(0.95	)%		(0.95	)%
	Expense ratio, excluding brokerage commissions			(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%
	Net investment income (loss)			(1.14	)%		(0.91	)%		(0.90	)%		(0.93	)%		(0.97	)%		(0.90	)%		(0.90	)%
	#	The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period.
	†	Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds’ net asset value is calculated.
	For the Year Ended December 31, 2014
	Per Share Operating Performance		Ultra			Ultra			Ultra			Ultra Gold			Ultra Silver			Ultra			Ultra Euro			Ultra Yen
			Bloomberg			Bloomberg			Bloomberg									Australian
			Commodity			Crude Oil			Natural Gas									Dollar
	Net asset value, at December 31, 2013		$	19.4317		$	32.0899		$	38.8383		$	41.2553		$	63.3305		$	31.6801		$	26.0346		$	18.6318
	Net investment income (loss)			(0.1762	)		(0.2186	)		(0.3792	)		(0.4078	)		(0.5348	)		(0.3111	)		(0.2185	)		(0.1673	)
	Net realized and unrealized gain (loss)#			(6.2218	)		(21.7233	)		(23.0468	)		(0.8464	)		(23.4300	)		(3.9687	)		(5.9417	)		(4.3456	)
	Change in net asset value from operations			(6.3980	)		(21.9419	)		(23.4260	)		(1.2542	)		(23.9648	)		(4.2798	)		(6.1602	)		(4.5129	)
	Net asset value, at December 31, 2014		$	13.0337		$	10.148		$	15.4123		$	40.0011		$	39.3657		$	27.4003		$	19.8744		$	14.1189
	Market value per share, at December 31, 2013†		$	19.13		$	32.22		$	39.28		$	41.26		$	63.04		$	31.61		$	25.98		$	18.61
	Market value per share, at December 31, 2014†		$	12.86		$	10.37		$	15.78		$	38.41		$	38.05		$	27.43		$	19.8		$	14.12
	Total Return, at net asset value			(32.9	)%		(68.4	)%		(60.3	)%		(3.0	)%		(37.8	)%		(13.5	)%		(23.7	)%		(24.2	)%
	Total Return, at market value			(32.8	)%		(67.8	)%		(59.8	)%		(6.9	)%		(39.6	)%		(13.2	)%		(23.8	)%		(24.1	)%
	Ratios to Average Net Assets
	Expense ratio			(0.95	)%		(0.99	)%		(1.13	)%		(0.95	)%		(0.95	)%		(1.00	)%		(0.95	)%		(0.95	)%
	Expense ratio, excluding brokerage commissions			(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%
	Net investment income (loss)			(0.91	)%		(0.95	)%		(1.10	)%		(0.91	)%		(0.91	)%		(0.94	)%		(0.91	)%		(0.90	)%
	#	The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period.
	†	Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds’ net asset value is calculated.
	Selected data for a Share outstanding throughout the year ended December 31, 2013:
For the Year Ended December 31, 2013
Per Share Operating Performance		VIX Short-			VIX Mid-			Short VIX			Ultra VIX			UltraShort			UltraShort			UltraShort
		Term Futures			Term Futures			Short-Term			Short-Term			Bloomberg			Bloomberg			Bloomberg
		ETF*			ETF*			Futures ETF*			Futures ETF*			Commodity			Crude Oil			Natural Gas*
Net asset value, at December 31, 2012		$	83.9374		$	138.8013		$	33.0649		$	805.2711		$	54.1021		$	40.3079		$	102.1402
Net investment income (loss)			(0.3518	)		(0.7892	)		(0.7398	)		(3.0009	)		(0.5355	)		(0.3033	)		(0.9217	)
Net realized and unrealized gain (loss)#			(55.0469	)		(60.8284	)		35.1742			(735.1861	)		9.727			(8.2745	)		(31.2550	)
Change in net asset value from operations			(55.3987	)		(61.6176	)		34.4344			(738.1870	)		9.1915			(8.5778	)		(32.1767	)
Net asset value, at December 31, 2013		$	28.5387		$	77.1837		$	67.4993		$	67.0841		$	63.2936		$	31.7301		$	69.9635
Market value per share, at December 31, 2012†		$	85.05		$	136.88		$	32.73		$	836		$	51.64		$	40.44		$	101.64
Market value per share, at December 31, 2013†		$	28.53		$	77.16		$	67.47		$	67.12		$	58.41		$	31.58		$	69.36
Total Return, at net asset value			(66.0	)%		(44.4	)%		104.1	%		(91.7	)%		17	%		(21.3	)%		(31.5	)%
Total Return, at market value			(66.5	)%		(43.6	)%		106.2	%		(92.0	)%		13.1	%		(21.9	)%		(31.8	)%
Ratios to Average Net Assets
Expense ratio			(0.85	)%		(0.85	)%		(1.53	)%		(1.82	)%		(0.95	)%		(0.98	)%		(1.20	)%
Expense ratio, excluding brokerage commissions			(0.85	)%		(0.85	)%		(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%
Net investment income (loss)			(0.81	)%		(0.81	)%		(1.49	)%		(1.80	)%		(0.90	)%		(0.94	)%		(1.15	)%
*	See Note 1 of these Notes to Financial Statements.
#	The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period.
†	Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds’ net asset value is calculated.
For the Year Ended December 31, 2013
Per Share Operating Performance		UltraShort			UltraShort			Short Euro			UltraShort			UltraShort			UltraShort			Ultra
		Gold			Silver						Australian			Euro			Yen			Bloomberg
											Dollar									Commodity
Net asset value, at December 31, 2012		$	63.8688		$	51.3951		$	37.6285		$	37.8081		$	19.0172		$	50.7577		$	24.3875
Net investment income (loss)			(0.7561	)		(0.6223	)		(0.3430	)		(0.4325	)		(0.1677	)		(0.5662	)		(0.1945	)
Net realized and unrealized gain (loss)#			40.4053			39.0092			(1.6988	)		9.2628			(1.7882	)		20.6725			(4.7613	)
Change in net asset value from operations			39.6492			38.3869			(2.0418	)		8.8303			(1.9559	)		20.1063			(4.9558	)
Net asset value, at December 31, 2013		$	103.518		$	89.782		$	35.5867		$	46.6384		$	17.0613		$	70.864		$	19.4317
Market value per share, at December 31, 2012†		$	62.6		$	50.07		$	37.64		$	37.74		$	19.01		$	50.77		$	23.93
Market value per share, at December 31, 2013†		$	103.53		$	90.19		$	35.66		$	46.66		$	17.06		$	70.91		$	19.13
Total Return, at net asset value			62.1	%		74.7	%		(5.4	)%		23.4	%		(10.3	)%		39.6	%		(20.3	)%
Total Return, at market value			65.4	%		80.1	%		(5.3	)%		23.6	%		(10.3	)%		39.7	%		(20.1	)%
Ratios to Average Net Assets
Expense ratio			(0.95	)%		(0.95	)%		(0.96	)%		(1.02	)%		(0.95	)%		(0.95	)%		(0.95	)%
Expense ratio, excluding brokerage commissions			(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%
Net investment income (loss)			(0.90	)%		(0.89	)%		(0.93	)%		(0.99	)%		(0.90	)%		(0.91	)%		(0.90	)%
#	The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period.
†	Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds’ net asset value is calculated.
For the Year Ended December 31, 2013
Per Share Operating Performance		Ultra			Ultra			Ultra Gold			Ultra Silver*			Ultra			Ultra Euro			Ultra Yen
		Bloomberg			Bloomberg									Australian
		Crude Oil			Natural Gas									Dollar
Net asset value, at December 31, 2012		$	29.3941		$	39.049		$	83.7634		$	171.8906		$	41.4986		$	24.3499		$	28.184
Net investment income (loss)			(0.2849	)		(0.4054	)		(0.5404	)		(0.8789	)		(0.3490	)		(0.2200	)		(0.1996	)
Net realized and unrealized gain (loss)#			2.9807			0.1947			(41.9677	)		(107.6812	)		(9.4695	)		1.9047			(9.3526	)
Change in net asset value from operations			2.6958			(0.2107	)		(42.5081	)		(108.5601	)		(9.8185	)		1.6847			(9.5522	)
Net asset value, at December 31, 2013		$	32.0899		$	38.8383		$	41.2553		$	63.3305		$	31.6801		$	26.0346		$	18.6318
Market value per share, at December 31, 2012†		$	29.32		$	39.24		$	85.34		$	176.4		$	41.45		$	24.32		$	28.28
Market value per share, at December 31, 2013†		$	32.22		$	39.28		$	41.26		$	63.04		$	31.61		$	25.98		$	18.61
Total Return, at net asset value			9.2	%		(0.5	)%		(50.7	)%		(63.2	)%		(23.7	)%		6.9	%		(33.9	)%
Total Return, at market value			9.9	%		0.1	%		(51.7	)%		(64.3	)%		(23.7	)%		6.8	%		(34.2	)%
Ratios to Average Net Assets
Expense ratio			(0.97	)%		(1.15	)%		(0.95	)%		(0.95	)%		(0.99	)%		(0.95	)%		(0.95	)%
Expense ratio, excluding brokerage commissions			(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%
Net investment income (loss)			(0.92	)%		(1.10	)%		(0.89	)%		(0.89	)%		(0.95	)%		(0.90	)%		(0.90	)%
#	The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period.
†	Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds’ net asset value is calculated.
Selected data for a Share outstanding throughout the year ended December 31, 2012:
For the Year Ended December 31, 2012
Per Share Operating Performance		VIX Short-			VIX Mid-			Short VIX			Ultra VIX Short-			UltraShort			UltraShort			UltraShort
		Term Futures			Term Futures			Short-Term			Term Futures			Bloomberg			Bloomberg			Bloomberg
		ETF*			ETF*			Futures ETF*			ETF*			Commodity			Crude Oil			Natural Gas*
Net asset value, at December 31, 2011		$	381.869		$	296.5588		$	12.9332		$	29,673.01		$	56.9207		$	38.8151		$	95.2206
Net investment income (loss)			(1.0285	)		(1.6200	)		(0.4190	)		(38.4329	)		(0.4894	)		(0.3595	)		(1.5571	)
Net realized and unrealized gain (loss)#			(296.9031	)		(156.1375	)		20.5507			(28,829.3080	)		(2.3292	)		1.8523			8.4767
Change in net asset value from operations			(297.9316	)		(157.7575	)		20.1317			(28,867.7409	)		(2.8186	)		1.4928			6.9196
Net asset value, at December 31, 2012		$	83.9374		$	138.8013		$	33.0649		$	805.2711		$	54.1021		$	40.3079		$	102.1402
Market value per share, at December 31, 2011†		$	378.7		$	296.52		$	13.07		$	29,184.00		$	56.19		$	38.69		$	95.84
Market value per share, at December 31, 2012†		$	85.05		$	136.88		$	32.73		$	836		$	51.64		$	40.44		$	101.64
Total Return, at net asset value			(78.0	)%		(53.2	)%		155.7	%		(97.3	)%		(5.0	)%		3.8	%		7.3	%
Total Return, at market value			(77.5	)%		(53.8	)%		150.4	%		(97.1	)%		(8.1	)%		4.5	%		6.1	%
Ratios to Average Net Assets
Expense ratio			(0.85	)%		(0.85	)%		(1.63	)%		(1.77	)%		(0.95	)%		(0.98	)%		(1.39	)%
Expense ratio, excluding brokerage commissions			(0.85	)%		(0.85	)%		(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%
Net investment income (loss)			(0.79	)%		(0.80	)%		(1.56	)%		(1.73	)%		(0.89	)%		(0.91	)%		(1.33	)%
*	See Note 1 of these Notes to Financial Statements.
#	The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period.
†	Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds’ net asset value is calculated.
For the Year Ended December 31, 2012
Per Share Operating Performance		UltraShort			UltraShort			Short Euro+			UltraShort			UltraShort			UltraShort			Ultra
		Gold*			Silver*						Australian			Euro			Yen			Bloomberg
											Dollar++									Commodity
Net asset value, at beginning of period		$	82.7114		$	76.6771		$	40		$	40		$	20.3357		$	40.9557		$	25.8805
Net investment income (loss)			(0.5901	)		(0.4806	)		(0.1799	)		(0.1633	)		(0.1804	)		(0.3847	)		(0.2291	)
Net realized and unrealized gain (loss)#			(18.2525	)		(24.8014	)		(2.1916	)		(2.0286	)		(1.1381	)		10.1867			(1.2639	)
Change in net asset value from operations			(18.8426	)		(25.2820	)		(2.3715	)		(2.1919	)		(1.3185	)		9.802			(1.4930	)
Net asset value, at December 31, 2012		$	63.8688		$	51.3951		$	37.6285		$	37.8081		$	19.0172		$	50.7577		$	24.3875
Market value per share, at December 31, 2011†		$	79.24		$	79.35		$	40		$	40		$	20.35		$	40.95		$	25.64
Market value per share, at December 31, 2012†		$	62.6		$	50.07		$	37.64		$	37.74		$	19.01		$	50.77		$	23.93
Total Return, at net asset value			(22.8	)%		(33.0	)%		(5.9	)% ^		(5.5	)% ^		(6.5	)%		23.9	%		(5.8	)%
Total Return, at market value			(21.0	)%		(36.9	)%		(5.9	)% ^		(5.7	)% ^		(6.6	)%		24	%		(6.7	)%
Ratios to Average Net Assets
Expense ratio			(0.95	)%		(0.95	)%		(0.96	)%**		(1.00	)%**		(0.95	)%		(0.95	)%		(0.95	)%
Expense ratio, excluding brokerage commissions			(0.95	)%		(0.95	)%		(0.95	)%**		(0.95	)%**		(0.95	)%		(0.95	)%		(0.95	)%
Net investment income (loss)			(0.89	)%		(0.89	)%		(0.89	)%**		(0.92	)%**		(0.89	)%		(0.88	)%		(0.89	)%
+	From commencement of operations, June 26, 2012, through December 31, 2012.
++	From commencement of operations, July 17, 2012, through December 31, 2012.
#	The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period.
†	Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds’ net asset value is calculated.
^	Percentages are not annualized for the period ended December 31, 2012.
**	Percentages are annualized.
For the Year Ended December 31, 2012
Per Share Operating Performance		Ultra			Ultra			Ultra Gold			Ultra Silver*			Ultra			Ultra Euro			Ultra Yen+
		Bloomberg			Bloomberg									Australian
		Crude Oil			Natural Gas*									Dollar+
Net asset value, at beginning of period		$	40.8828		$	101.9786		$	75.9066		$	172.7611		$	40		$	23.886		$	36.4704
Net investment income (loss)			(0.2904	)		(0.5205	)		(0.7680	)		(1.7289	)		(0.1740	)		(0.2106	)		(0.2962	)
Net realized and unrealized gain (loss)#			(11.1983	)		(62.4091	)		8.6248			0.8584			1.6726			0.6745			(7.9902	)
Change in net asset value from operations			(11.4887	)		(62.9296	)		7.8568			(0.8705	)		1.4986			0.4639			(8.2864	)
Net asset value, at December 31, 2012		$	29.3941		$	39.049		$	83.7634		$	171.8906		$	41.4986		$	24.3499		$	28.184
Market value per share, at December 31, 2011†		$	40.94		$	101.35		$	79.01		$	166.6		$	40		$	23.87		$	36.5
Market value per share, at December 31, 2012†		$	29.32		$	39.24		$	85.34		$	176.4		$	41.45		$	24.32		$	28.28
Total Return, at net asset value			(28.1	)%		(61.7	)%		10.4	%		(0.5	)%		3.7	% ^		1.9	%		(22.7	)%
Total Return, at market value			(28.4	)%		(61.3	)%		8	%		5.9	%		3.6	% ^		1.9	%		(22.5	)%
Ratios to Average Net Assets
Expense ratio			(0.97	)%		(1.21	)%		(0.95	)%		(0.95	)%		(1.00	)%**		(0.95	)%		(0.95	)%
Expense ratio, excluding brokerage commissions			(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%**		(0.95	)%		(0.95	)%
Net investment income (loss)			(0.91	)%		(1.15	)%		(0.88	)%		(0.88	)%		(0.92	)%**		(0.90	)%		(0.88	)%
*	See Note 1 of these Notes to Financial Statements.
+	From commencement of operations, July 17, 2012, through December 31, 2012.
#	The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period.
†	Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds’ net asset value is calculated.
^	Percentages are not annualized for the period ended December 31, 2012.
**	Percentage are annualized.

Risk

Risk	12 Months Ended
	Dec. 31, 2014
Risks and Uncertainties [Abstract]
Risk	NOTE 8 – RISK
	Correlation and Compounding Risk
	The Geared Funds do not seek to achieve their stated investment objective over a period of time greater than a single day (as measured from NAV calculation time to NAV calculation time). The return of a Geared Fund for a period longer than a single day is the result of its return for each day compounded over the period and usually will differ from the inverse (-1x), two times the inverse (-2x), or two times (2x) of the return of the Geared Fund’s benchmark for the period. A Fund will lose money if its benchmark performance is flat over time, and it is possible for a Geared Fund to lose money over time even if the performance of its benchmark increases (or decreases in the case of Short and UltraShort Funds), as a result of daily rebalancing, the benchmark’s volatility and compounding. Longer holding periods, higher benchmark volatility, inverse exposure and greater leverage each affect the impact of compounding on a Fund’s returns. Daily compounding of a Geared Fund’s investment returns can dramatically and adversely affect its longer-term performance during periods of high volatility. Volatility may be at least as important to a Geared Fund’s return for a period as the return of the Fund’s underlying benchmark. The Matching VIX Funds and the Managed Futures Fund seek to achieve their stated investment objective both over a single day and over time.
	Each Ultra and UltraShort 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 Fund with a 2x multiple should be approximately two times as volatile on a daily basis as is the return of a fund with an objective of matching the same benchmark. The daily return of a Short or UltraShort Fund is designed to return the inverse (-1x) or two times the inverse (-2x) of the return that would be expected of a fund with an objective of matching the same benchmark. The Geared Funds are not appropriate for all investors and present different risks than other funds. The Leveraged Funds use leverage and are riskier than similarly benchmarked exchange-traded funds that do not use leverage. An investor should only consider an investment in a Geared Fund if he or she understands the consequences of seeking daily leveraged, daily inverse or daily inverse leveraged investment results. Daily objective geared funds, if used properly and in conjunction with the investor’s view on the future direction and volatility of the markets, can be useful tools for investors who want to manage their exposure to various markets and market segments and who are willing to monitor and/or periodically rebalance their portfolios. Shareholders who invest in the Funds should actively manage and monitor their investments, as frequently as daily.
	While the Funds expect to meet their investment objectives, several factors may affect their ability to do so. Among these factors are: (1) the Sponsor’s ability to purchase and sell Financial Instruments in a manner that correlates to a Fund’s objective; (2) an imperfect correlation between the performance of Financial Instruments held by a Fund and the performance of the applicable benchmark; (3) bid-ask spreads on such Financial Instruments; (4) fees, expenses, transaction costs, financing costs associated with the use of Financial Instruments and commission costs; (5) holding instruments traded in a market that has become illiquid or disrupted; (6) a Fund’s Share prices being rounded to the nearest cent and/or valuation methodology; (7) changes to a benchmark index that are not disseminated in advance; (8) the need to conform a Fund’s portfolio holdings to comply with investment restrictions or policies or regulatory or tax law requirements; (9) early and unanticipated closings of the markets on which the holdings of a Fund trade, resulting in the inability of the Fund to execute intended portfolio transactions; (10) accounting standards; and (11) differences caused by a Fund obtaining exposure to only a representative sample of the components of a benchmark, overweighting or underweighting certain components of a benchmark or obtaining exposure to assets that are not included in a benchmark.
	A number of factors may affect a Geared Fund’s ability to achieve a high degree of correlation with its benchmark, and there can be no guarantee that a Fund will achieve a high degree of correlation. Failure to achieve a high degree of correlation may prevent a Geared Fund from achieving its investment objective. In order to achieve a high degree of correlation with their underlying benchmarks, the Geared Funds seek to rebalance their portfolios daily to keep exposure consistent with their investment objectives. Being materially under- or over-exposed to the benchmark may prevent such Geared Funds from achieving a high degree of correlation with such benchmark. Market disruptions or closure, large amounts of assets into or out of the Geared Funds, regulatory restrictions or extreme market volatility will adversely affect such Funds’ ability to adjust exposure to requisite levels. The target amount of portfolio exposure is impacted dynamically by the benchmarks’ movements during each day. Because of this, it is unlikely that the Geared Funds will be perfectly exposed (i.e., -1x, -2x or 2x, as applicable) to its benchmark at the end of each day, and the likelihood of being materially under- or over-exposed is higher on days when the benchmark levels are volatile near the close of the trading day. In addition, unlike other funds that do not rebalance their portfolios as frequently, each Geared Fund may be subject to increased trading costs associated with daily portfolio rebalancing in order to maintain appropriate exposure to the underlying benchmarks.
	Counterparty Risk
	Certain of the Funds will use swap agreements and/or forward contracts as a means to achieve their respective investment objectives. Such Funds will use either swap agreements and/or forward contracts referencing their respective benchmarks. These Funds may also invest in other swap agreements or forward contracts if such instruments tend to exhibit trading prices or returns that correlate with the benchmark or a component of the benchmark and will further the investment objective of the Fund. Certain Funds may invest in swap agreements or forward contracts if position accountability rules or position limits are reached with respect to specific futures contracts or the market for a specific futures contract experiences emergencies (e.g., natural disaster, terrorist attack or an act of God) or disruptions (e.g., a trading halt or a flash crash) that prevent the Funds from obtaining the appropriate amount of investment exposure to the affected futures contract or certain other futures contracts. Although unlikely, those Funds, under these circumstances, could have 100% exposure to swap agreements or forward contracts.
	Swap agreements and forward contracts are generally traded in OTC markets and have only recently become subject to regulation by the CFTC. CFTC rules, however, do not cover all types of swap agreements and forward contracts. Investors, therefore, may not receive the protection of CFTC regulation or the statutory scheme of the Commodity Exchange Act (the “CEA”) in connection with each Fund’s swap agreements or forward contracts. The lack of regulation in these markets could expose investors to significant losses under certain circumstances, including in the event of trading abuses or financial failure by participants.
	The Funds will be subject to credit risk with respect to the counterparties to the derivatives contracts (whether a clearing corporation in the case of cleared instruments or another third party in the case of OTC uncleared instruments). Unlike in futures contracts, the counterparty to uncleared swap agreements or forward contracts is generally a single bank or other financial institution, rather than a clearing organization backed by a group of financial institutions. As a result, a Fund is subject to credit risk with respect to the amount it expects to receive from counterparties to uncleared swaps and forward contracts entered into as part of that Fund’s principal investment strategy. If a counterparty becomes bankrupt or otherwise fails to perform its obligations due to financial difficulties, a Fund could suffer significant losses on these contracts and the value of an investor’s investment in a Fund may decline.
	The Funds have sought to mitigate these risks by generally requiring that the counterparties for each Fund agree to post collateral for the benefit of the Fund, marked to market daily, subject to certain minimum thresholds; however there are no limitations on the percentage of its assets each Fund may invest in swap agreements or forward contracts with a particular counterparty. To the extent any such collateral is insufficient or there are delays in accessing the collateral, the Funds will be exposed to counterparty risk as described above, including possible delays in recovering amounts as a result of bankruptcy proceedings. The Funds typically enter into transactions only with major global financial institutions.
	OTC swaps or forward contracts are less liquid than futures contracts because they are not traded on an exchange, do not have uniform terms and conditions, and are generally entered into based upon the creditworthiness of the parties and the availability of credit support, such as collateral, and in general, are not transferable without the consent of the counterparty. If the level of the Fund’s benchmark has a dramatic intraday move that would cause a material decline in the Fund’s NAV, the terms of the swap may permit the counterparty to immediately close out the transaction with the Fund. In that event, it may not be possible for the Fund to enter into another swap agreement or to invest in other Financial Instruments necessary to achieve the desired exposure consistent with the Fund’s objective. This, in turn, may prevent the Fund from achieving its investment objective, particularly if the level of the Fund’s benchmark reverses all or part of its intraday move by the end of the day. In addition, cleared derivative transactions benefit from daily marking-to-market and settlement, and segregation and minimum capital requirements applicable to intermediaries. Transactions entered into directly between two counterparties generally do not benefit from such protections. This exposes the Funds to the risk that a counterparty will not settle a transaction in accordance with its terms and conditions because of a dispute over the terms of the contract (whether or not bona fide) or because of a credit or liquidity problem, thus causing the Funds to suffer a loss.
	Each counterparty and/or any of its affiliates may be an Authorized Participant or shareholder of a Fund.
	The counterparty risk for cleared derivative transactions is generally lower than for uncleared OTC derivatives since generally a clearing organization becomes substituted for each counterparty to a cleared derivative contract and, in effect, guarantees the parties’ performance under the contract as each party to a trade looks only to the clearing house for performance of financial obligations. However, there can be no assurance that the clearing house, or its members, will satisfy its obligations to the Fund.
	Leverage Risk
	The Leveraged Funds may utilize leverage in seeking to achieve their respective investment objectives and will lose more money in market environments adverse to their respective daily investment objectives than funds that do not employ leverage. The use of leveraged and/or inverse leveraged positions could result in the total loss of an investor’s investment.
	For example, because the UltraShort Funds and Ultra Funds include a two times the inverse (-2x), or a two times (2x) multiplier, a single-day movement in the relevant benchmark approaching 50% at any point in the day (for an UltraShort Fund or an UltraShort Fund) could result in the total loss or almost total loss of an investor’s investment if that movement is contrary to the investment objective of the Fund in which an investor has invested, even if such Fund’s benchmark subsequently moves in an opposite direction, eliminating all or a portion of the movement. This would be the case with downward single-day or intraday movements in the underlying benchmark of an Ultra Fund or upward single-day or intraday movements in the benchmark of an UltraShort Fund, even if the underlying benchmark maintains a level greater than zero at all times.
	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 2014 may specify a January 2015 expiration. As that contract nears expiration, it may be replaced by selling the January 2015 contract and purchasing the contract expiring in March 2015. 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 2015 contract would take place at a price that is higher than the price at which the March 2015 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, the Managed Futures Fund or a Matching VIX Fund that invests in such futures, and positively affect a Short Fund or an UltraShort 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 and UltraShort Funds, and positively affect the Ultra Funds, the Managed Futures Fund and Matching VIX Funds.
	Since the introduction of VIX futures contracts, there have frequently been periods where VIX futures prices reflect higher expected volatility levels further out in time. This can result in a loss from “rolling” the VIX futures to maintain the constant weighted average maturity of the applicable VIX Futures Index. Losses from exchanging a lower priced VIX future for a higher priced longer-term future in the rolling process would adversely affect the value of each VIX Futures Index and, accordingly, decrease the return of the Ultra VIX Short-Term Futures ETF and the Matching VIX Funds.
	Gold and silver historically exhibit persistent “contango” markets rather than backwardation. Natural gas, like crude oil, moves in and out of backwardation and contango but historically has been in contango most commonly. It is generally believed this is because the market needs to build inventories for most of the year in order to have enough storage to make it through a normal winter. Periods of backwardation are typically thought to be caused by demand shocks or supply shortages such as an unusually cold winter or a hurricane.
	Shareholder Concentration
	As of December 31, 2014, ProShares Morningstar Alternatives Solution ETF, an ETF affiliated with the Funds, owned 78.2% of the outstanding shares of the Managed Futures Fund. Subscription and redemption activity by concentrated shareholders may have a significant effect on the operations of the Fund.
	Other Matters
	On September 9, 2014, NYSE Regulation, Inc. (“NYSE Regulation”) sent a letter informing the Sponsor that ProShares Ultra Australian Dollar failed to comply with continued NYSE Arca Equities, Inc. listing standards regarding its number of record or beneficial holders. The Sponsor sent a written plan (“Plan”) to the NYSE Regulation designed to increase and sustain a higher number of record or beneficial holders. Upon review and consideration of the Plan, the NYSE Regulation Staff has granted an extension allowing the continued listing of ProShares Ultra Australian Dollar through at least March 23, 2015. There is no guarantee that the Fund will be able to meet the continued listing standards and avoid a delisting action after that date. If the Fund is delisted, there will not be an active trading market for the Fund’s Shares. If investors need to sell their Fund Shares at a time when no active market for them exists, the price investors receive for the Fund’s Shares, assuming that investors are able to sell them, likely will be lower than the price that investors would receive if an active market did exist. In addition, if the Fund is delisted, the Fund would likely be forced to liquidate.

Subsequent_Events

Subsequent Events	12 Months Ended
	Dec. 31, 2014
Subsequent Events [Abstract]
Subsequent Events	NOTE 9 – SUBSEQUENT EVENTS
	On February 19, 2015, the LBMA, the company that runs the London gold fix, announced that the London gold fix, which currently serves as the benchmark for ProShares Ultra Gold and ProShares UltraShort Gold, will be replaced on March 20, 2015. The LBMA has selected ICE Benchmark Administration to calculate the price, which will be renamed the LBMA Gold Price and be based on an electronic, physically settled auction-based methodology.
	ProShares Ultra Gold and ProShares Ultra Short Gold are designed to correspond (before fees and expenses) to two times (2x) or two times the inverse (-2x), respectively, of the daily performance of gold bullion as measured by the U.S. dollar p.m. fixing price for delivery in London. Accordingly, through March 19, 2015, the price of gold will be the U.S. dollar price of gold bullion as measured by the London afternoon fixing price per troy ounce of unallocated gold bullion for delivery in London through a member of the LBMA, authorized to effect such delivery. On March 20, 2015, the price of gold will be the afternoon LBMA Gold Price. The London gold fix (and, as of March 20, 2015, the LBMA Gold Price) is determined each trading day at 3:00 p.m. London time, providing a reference gold price for that day’s trading.

Significant_Accounting_Policie1

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Use of Estimates and 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 and disclosures in these financial statements. 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.
	In June 2013, the FASB issued Accounting Standard Update No. 2013-08, “Financial Services – Investment Companies (“Topic 946”): Amendments to the Scope, Measurement and Disclosure Requirements” (“ASU 2013-08”). ASU 2013-08 clarifies the characteristics of an investment company and provides comprehensive guidance for assessing whether an entity is an investment company and for the measurement of non-controlling ownership interests in other investment companies. The Trust and each Fund meet the requirements to be classified as an investment company and follow the accounting and reporting guidance in FASB Topic 946.
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, 2014 and 2013, and represents non-segregated cash with the custodian and does not include short-term investments.
Final Net Asset Value for Fiscal Period	Final Net Asset Value for Fiscal Period
	The times of the calculation of the Funds’ final net asset value for creation and redemption of fund shares for the year ended December 31, 2014 were as follows. All times are Eastern Standard Time:
			NAV Calculation Time			NAV Calculation Date
	UltraShort Silver, Ultra Silver			7:00 a.m.			December 31
	UltraShort Gold, Ultra Gold			10:00 a.m.			31-Dec
	UltraShort Bloomberg Crude Oil, Ultra Bloomberg Crude Oil			2:30 p.m.			31-Dec
	UltraShort Bloomberg Natural Gas, Ultra Bloomberg Natural Gas			2:30 p.m.			31-Dec
	UltraShort Bloomberg Commodity, Ultra Bloomberg Commodity			2:30 p.m.	*		31-Dec
	Managed Futures Strategy			3:00 p.m.			31-Dec
	UltraShort Australian Dollar, Ultra Australian Dollar			4:00 p.m.			31-Dec
	Short Euro, UltraShort Euro, Ultra Euro			4:00 p.m.			31-Dec
	UltraShort Yen, Ultra Yen			4:00 p.m.			31-Dec
	VIX Short-Term Futures ETF, Short VIX Short-Term Futures ETF, Ultra VIX Short-Term Futures ETF			4:15 p.m.			31-Dec
	VIX Mid-Term Futures ETF			4:15 p.m.			31-Dec
	*	On July 31, 2014, the NAV Calculation Time for the Bloomberg Commodity Index was changed from 3:00 p.m. to 2:30 p.m.
	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, 2014.
	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, 2014.
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 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 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. If there was no sale on that day, and for non-exchange-traded derivatives, 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 for such day. Such fair value prices would be generally 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 normal industry standards. When market closing prices are not available, the Sponsor may fair value an asset of a Fund pursuant to the policies the Sponsor has adopted, which are consistent with normal industry standards. 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, 2014 using the fair value hierarchy:
			Level I - Quoted Prices						Level II - Other Significant Observable Inputs
			Short-Term U.S.			Futures			Forward			Foreign			Swap			Total
			Government and			Contracts*			Agreements			Currency			Agreements
			Agencies									Forward
												Contracts
	Managed Futures Strategy		$	—		$	104,327		$	—		$	—		$	—		$	104,327
	VIX Short-Term Futures ETF			82,088,299			6,264,620			—			—			—			88,352,919
	VIX Mid-Term Futures ETF			24,105,906			260,665			—			—			—			24,366,571
	Short VIX Short-Term Futures ETF			446,975,220			(16,352,149	)		—			—			—			430,623,071
	Ultra VIX Short-Term Futures ETF			182,639,188			39,585,253			—			—			—			222,224,441
	UltraShort Bloomberg Commodity			4,233,548			—			—			—			567,259			4,800,807
	UltraShort Bloomberg Crude Oil			131,594,608			15,806,603			—			—			27,018,077			174,419,288
	UltraShort Bloomberg Natural Gas			8,672,710			3,941,465			—			—			—			12,614,175
	UltraShort Gold			84,040,107			(4,520	)		(2,282,778	)		—			—			81,752,809
	UltraShort Silver			52,226,692			1,560			594,953			—			—			52,823,205
	Short Euro			12,086,577			385,331			—			—			—			12,471,908
	UltraShort Australian Dollar			20,267,679			743,481			—			—			—			21,011,160
	UltraShort Euro			487,111,117			—			—			16,762,994			—			503,874,111
	UltraShort Yen			532,957,746			—			—			(1,578,775	)		—			531,378,971
	Ultra Bloomberg Commodity			2,754,900			—			—			—			(331,338	)		2,423,562
	Ultra Bloomberg Crude Oil			467,200,736			(46,474,787	)		—			—			(76,181,097	)		344,544,852
	Ultra Bloomberg Natural Gas			53,410,227			(34,889,283	)		—			—			—			18,520,944
	Ultra Gold			101,927,857			4,580			2,051,154			—			—			103,983,591
	Ultra Silver			305,474,211			(1,560	)		(12,395,120	)		—			—			293,077,531
	Ultra Australian Dollar			2,405,685			(96,825	)		—			—			—			2,308,860
	Ultra Euro			2,415,698			—			—			(103,371	)		—			2,312,327
	Ultra Yen			1,287,869			—			—			(15,245	)		—			1,272,624
	Total Trust		$	3,005,876,580		$	(30,721,239	)	$	(12,031,791	)	$	15,065,603		$	(48,927,099	)	$	2,929,262,054
	*	Includes cumulative appreciation/depreciation of futures contracts as reported in the Schedules of Investments. Only current day’s variation margin is reported within the Statements of Financial Condition in receivable/payable on open futures.
	At December 31, 2014, there were no Level III portfolio investments for which significant unobservable inputs were used to determine fair value.
	The Funds’ policy is to recognize transfers between valuation levels at the end of the reporting period.
	At December 31, 2014, there were no significant transfers in or out of Level I and Level II fair value measurements.
	The inputs or methodology used for valuing investments are not necessarily an indication of the risk associated with investing in those securities.
	The following table summarizes the valuation of investments at December 31, 2013 using the fair value hierarchy:
			Level I - Quoted Prices						Level II - Other Significant Observable Inputs
			Short-Term U.S.			Futures			Forward			Foreign			Swap			Total
			Government and			Contracts*			Agreements			Currency			Agreements
			Agencies									Forward
												Contracts
	VIX Short-Term Futures ETF		$	207,636,383		$	(16,652,686	)	$	—		$	—		$	—		$	190,983,697
	VIX Mid-Term Futures ETF			46,040,233			(4,896,689	)		—			—			—			41,143,544
	Short VIX Short-Term Futures ETF			105,559,022			8,116,955			—			—			—			113,675,977
	Ultra VIX Short-Term Futures ETF			109,533,487			(24,009,911	)		—			—			—			85,523,576
	UltraShort Bloomberg Commodity			3,453,890			—			—			—			(27,665	)		3,426,225
	UltraShort Bloomberg Crude Oil			247,584,623			(1,232,773	)		—			—			(2,332,900	)		244,018,950
	UltraShort Bloomberg Natural Gas			18,274,713			1,042,300			—			—			—			19,317,013
	UltraShort Gold			148,988,329			14,520			5,633,053			—			—			154,635,902
	UltraShort Silver			114,826,066			14,200			(2,227,857	)		—			—			112,612,409
	Short Euro			7,902,056			(33,231	)		—			—			—			7,868,825
	UltraShort Australian Dollar			24,198,507			917,605			—			—			—			25,116,112
	UltraShort Euro			437,847,159			—			—			(13,748,507	)		—			424,098,652
	UltraShort Yen			558,597,264			—			—			29,386,684			—			587,983,948
	Ultra Bloomberg Commodity			2,816,688			—			—			—			15,078			2,831,766
	Ultra Bloomberg Crude Oil			137,435,610			626,661			—			—			1,957,893			140,020,164
	Ultra Bloomberg Natural Gas			58,921,011			(3,656,539	)		—			—			—			55,264,472
	Ultra Gold			140,880,950			(14,560	)		(6,812,974	)		—			—			134,053,416
Ultra Silver			467,868,976			(14,200	)		(2,492,880	)		—			—			465,361,896
Ultra Australian Dollar			2,716,439			(118,220	)		—			—			—			2,598,219
Ultra Euro			2,455,863			—			—			100,962			—			2,556,825
Ultra Yen			2,928,556			—			—			(159,309	)		—			2,769,247
Total Trust		$	2,846,465,825		$	(39,896,568	)	$	(5,900,658	)	$	15,579,830		$	(387,594	)	$	2,815,860,835
*	Includes cumulative appreciation/depreciation of futures contracts as reported in the Schedules of Investments. Only current day’s variation margin is reported within the Statements of Financial Condition in receivable/payable on open futures.
At December 31, 2013, there were no Level III portfolio investments for which significant unobservable inputs were used to determine fair value.
At December 31, 2013, there were no significant transfers in or out of Level I and Level II fair value measurements.
The inputs or methodology used for valuing investments are not necessarily an indication of the risk associated with investing in those securities.
Investment Transactions and Related Income	Investment Transactions and Related Income
	Investment transactions are recorded on the trade date. All such transactions are recorded on the identified cost basis and marked to market daily. Unrealized appreciation/depreciation on open contracts are reflected in the Statements of Financial Condition and changes in the unrealized appreciation/depreciation between periods are reflected in the Statements of Operations. Discounts on short-term securities purchased are amortized and reflected as Interest Income in the Statements of Operations.
Brokerage Commissions and Fees	Brokerage Commissions and Fees
	Each Fund pays its respective brokerage commissions, including applicable exchange fees, National Futures Association (“NFA”) fees, give-up fees, pit brokerage fees and other transaction related fees and expenses charged in connection with trading activities for each Fund’s investment in U.S. Commodity Futures Trading Commission regulated investments. The effects of trading spreads, financing costs/fees associated with Financial Instruments, and costs relating to the purchase of U.S. Treasury securities or similar high credit quality short-term fixed-income or similar securities would also be borne by the Funds. Brokerage commissions on futures contracts are recognized on a half-turn basis (e.g., the first half is recognized when the contract is purchased (opened) and the second half is recognized when the transaction is closed). For the years ended December 2013 and 2012 and the period from January 1, 2014 through July 30, 2014, the Sponsor paid brokerage commissions on VIX futures contracts for the Matching VIX Funds. On July 31, 2014, the Sponsor began paying, and is currently paying, brokerage commissions on VIX futures contracts for the Matching VIX Funds that exceed variable create/redeem fees collected by more than 0.02% of the Matching VIX Fund’s average net assets annually.
Federal Income Tax	Federal Income Tax
	Each Fund is registered as a series of a Delaware statutory trust and is treated as a partnership for U.S. federal income tax purposes. Accordingly, no Fund expects to incur U.S. federal income tax liability; rather, each beneficial owner of a Fund’s Shares is required to take into account its allocable share of its Fund’s income, gain, loss, deductions and other items for its Fund’s taxable year ending with or within the beneficial owner’s taxable year.
	Management of the Funds has reviewed all open tax years and major jurisdictions (i.e., 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 will monitor 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 analysis of tax law, regulation, and interpretations thereof.

Organization_Tables

Organization (Tables)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [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, 2012, 2013 and 2014. The ticker symbols for these Funds did not change, and each Fund continues to trade on the NYSE Arca.
	Fund	Execution Date	Type of Split	Date Trading
		(Prior to Opening		Resumed at Post-
		of Trading)		Split Price
	ProShares VIX Short-Term Futures ETF	10-Jun-13	1-for-5 reverse Share split	10-Jun-13
	ProShares VIX Mid-Term Futures ETF	November 6, 2014	1-for-4 reverse Share split	November 6, 2014
	ProShares Short VIX Short-Term Futures ETF	October 5, 2012	2-for-1 Share split	October 5, 2012
	ProShares Short VIX Short-Term Futures ETF	January 21, 2014	2-for-1 Share split	January 24, 2014
	ProShares Ultra VIX Short-Term Futures ETF	March 8, 2012	1-for-6 reverse Share split	March 8, 2012
	ProShares Ultra VIX Short-Term Futures ETF	September 7, 2012	1-for-10 reverse Share split	September 7, 2012
	ProShares Ultra VIX Short-Term Futures ETF	10-Jun-13	1-for-10 reverse Share split	10-Jun-13
	ProShares Ultra VIX Short-Term Futures ETF	January 21, 2014	1-for-4 reverse Share split	January 24, 2014
	ProShares UltraShort Bloomberg Natural Gas	May 11, 2012	3-for-1 Share split	May 11, 2012
	ProShares UltraShort Bloomberg Natural Gas	10-Jun-13	1-for-4 reverse Share split	June 10, 2013
	ProShares UltraShort Gold	October 5, 2012	1-for-4 reverse Share split	October 5, 2012
	ProShares UltraShort Silver	May 11, 2012	1-for-5 reverse Share split	May 11, 2012
	ProShares Ultra Bloomberg Natural Gas	May 11, 2012	1-for-5 reverse Share split	May 11, 2012
	ProShares Ultra Silver	January 21, 2014	1-for-4 reverse Share split	January 24, 2014

Significant_Accounting_Policie2

Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Calculation of Funds' Final Net Asset Value for Creation and Redemption of Fund Shares	The times of the calculation of the Funds’ final net asset value for creation and redemption of fund shares for the year ended December 31, 2014 were as follows. All times are Eastern Standard Time:
			NAV Calculation Time			NAV Calculation Date
	UltraShort Silver, Ultra Silver			7:00 a.m.			December 31
	UltraShort Gold, Ultra Gold			10:00 a.m.			31-Dec
	UltraShort Bloomberg Crude Oil, Ultra Bloomberg Crude Oil			2:30 p.m.			31-Dec
	UltraShort Bloomberg Natural Gas, Ultra Bloomberg Natural Gas			2:30 p.m.			31-Dec
	UltraShort Bloomberg Commodity, Ultra Bloomberg Commodity			2:30 p.m.	*		31-Dec
	Managed Futures Strategy			3:00 p.m.			31-Dec
	UltraShort Australian Dollar, Ultra Australian Dollar			4:00 p.m.			31-Dec
	Short Euro, UltraShort Euro, Ultra Euro			4:00 p.m.			31-Dec
	UltraShort Yen, Ultra Yen			4:00 p.m.			31-Dec
	VIX Short-Term Futures ETF, Short VIX Short-Term Futures ETF, Ultra VIX Short-Term Futures ETF			4:15 p.m.			31-Dec
	VIX Mid-Term Futures ETF			4:15 p.m.			31-Dec
	*	On July 31, 2014, the NAV Calculation Time for the Bloomberg Commodity Index was changed from 3:00 p.m. to 2:30 p.m.
Valuation of Investments using Fair Value Hierarchy	The following table summarizes the valuation of investments at December 31, 2014 using the fair value hierarchy:
			Level I - Quoted Prices						Level II - Other Significant Observable Inputs
			Short-Term U.S.			Futures			Forward			Foreign			Swap			Total
			Government and			Contracts*			Agreements			Currency			Agreements
			Agencies									Forward
												Contracts
	Managed Futures Strategy		$	—		$	104,327		$	—		$	—		$	—		$	104,327
	VIX Short-Term Futures ETF			82,088,299			6,264,620			—			—			—			88,352,919
	VIX Mid-Term Futures ETF			24,105,906			260,665			—			—			—			24,366,571
	Short VIX Short-Term Futures ETF			446,975,220			(16,352,149	)		—			—			—			430,623,071
	Ultra VIX Short-Term Futures ETF			182,639,188			39,585,253			—			—			—			222,224,441
	UltraShort Bloomberg Commodity			4,233,548			—			—			—			567,259			4,800,807
	UltraShort Bloomberg Crude Oil			131,594,608			15,806,603			—			—			27,018,077			174,419,288
	UltraShort Bloomberg Natural Gas			8,672,710			3,941,465			—			—			—			12,614,175
	UltraShort Gold			84,040,107			(4,520	)		(2,282,778	)		—			—			81,752,809
	UltraShort Silver			52,226,692			1,560			594,953			—			—			52,823,205
	Short Euro			12,086,577			385,331			—			—			—			12,471,908
	UltraShort Australian Dollar			20,267,679			743,481			—			—			—			21,011,160
	UltraShort Euro			487,111,117			—			—			16,762,994			—			503,874,111
	UltraShort Yen			532,957,746			—			—			(1,578,775	)		—			531,378,971
	Ultra Bloomberg Commodity			2,754,900			—			—			—			(331,338	)		2,423,562
	Ultra Bloomberg Crude Oil			467,200,736			(46,474,787	)		—			—			(76,181,097	)		344,544,852
	Ultra Bloomberg Natural Gas			53,410,227			(34,889,283	)		—			—			—			18,520,944
	Ultra Gold			101,927,857			4,580			2,051,154			—			—			103,983,591
	Ultra Silver			305,474,211			(1,560	)		(12,395,120	)		—			—			293,077,531
	Ultra Australian Dollar			2,405,685			(96,825	)		—			—			—			2,308,860
	Ultra Euro			2,415,698			—			—			(103,371	)		—			2,312,327
	Ultra Yen			1,287,869			—			—			(15,245	)		—			1,272,624
	Total Trust		$	3,005,876,580		$	(30,721,239	)	$	(12,031,791	)	$	15,065,603		$	(48,927,099	)	$	2,929,262,054
	*	Includes cumulative appreciation/depreciation of futures contracts as reported in the Schedules of Investments. Only current day’s variation margin is reported within the Statements of Financial Condition in receivable/payable on open futures.
	The following table summarizes the valuation of investments at December 31, 2013 using the fair value hierarchy:
			Level I - Quoted Prices						Level II - Other Significant Observable Inputs
			Short-Term U.S.			Futures			Forward			Foreign			Swap			Total
			Government and			Contracts*			Agreements			Currency			Agreements
			Agencies									Forward
												Contracts
	VIX Short-Term Futures ETF		$	207,636,383		$	(16,652,686	)	$	—		$	—		$	—		$	190,983,697
	VIX Mid-Term Futures ETF			46,040,233			(4,896,689	)		—			—			—			41,143,544
	Short VIX Short-Term Futures ETF			105,559,022			8,116,955			—			—			—			113,675,977
	Ultra VIX Short-Term Futures ETF			109,533,487			(24,009,911	)		—			—			—			85,523,576
	UltraShort Bloomberg Commodity			3,453,890			—			—			—			(27,665	)		3,426,225
	UltraShort Bloomberg Crude Oil			247,584,623			(1,232,773	)		—			—			(2,332,900	)		244,018,950
	UltraShort Bloomberg Natural Gas			18,274,713			1,042,300			—			—			—			19,317,013
	UltraShort Gold			148,988,329			14,520			5,633,053			—			—			154,635,902
	UltraShort Silver			114,826,066			14,200			(2,227,857	)		—			—			112,612,409
	Short Euro			7,902,056			(33,231	)		—			—			—			7,868,825
	UltraShort Australian Dollar			24,198,507			917,605			—			—			—			25,116,112
	UltraShort Euro			437,847,159			—			—			(13,748,507	)		—			424,098,652
	UltraShort Yen			558,597,264			—			—			29,386,684			—			587,983,948
	Ultra Bloomberg Commodity			2,816,688			—			—			—			15,078			2,831,766
	Ultra Bloomberg Crude Oil			137,435,610			626,661			—			—			1,957,893			140,020,164
	Ultra Bloomberg Natural Gas			58,921,011			(3,656,539	)		—			—			—			55,264,472
	Ultra Gold			140,880,950			(14,560	)		(6,812,974	)		—			—			134,053,416
	Ultra Silver			467,868,976			(14,200	)		(2,492,880	)		—			—			465,361,896
	Ultra Australian Dollar			2,716,439			(118,220	)		—			—			—			2,598,219
	Ultra Euro			2,455,863			—			—			100,962			—			2,556,825
	Ultra Yen			2,928,556			—			—			(159,309	)		—			2,769,247
	Total Trust		$	2,846,465,825		$	(39,896,568	)	$	(5,900,658	)	$	15,579,830		$	(387,594	)	$	2,815,860,835
	*	Includes cumulative appreciation/depreciation of futures contracts as reported in the Schedules of Investments. Only current day’s variation margin is reported within the Statements of Financial Condition in receivable/payable on open futures.

Investments_Tables

Investments (Tables)	12 Months Ended
	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Fair Value of Derivative Instruments	Fair Value of Derivative Instruments
	as of December 31, 2014
	Asset Derivatives								Liability Derivatives
	Derivatives not		Statements of		Fund	Unrealized			Statements of		Fund	Unrealized
	accounted for as		Financial			Appreciation			Financial			Depreciation
	hedging instruments		Condition						Condition
			Location						Location
	Managed Futures Contracts		Receivables on open futures contracts		ProShares Managed Futures Strategy	$	122,831	*	Payable on open futures contracts		ProShares Managed Futures Strategy	$	18,504	*
	VIX Futures Contracts		Receivables on open futures contracts		ProShares VIX Short-Term Futures ETF		6,264,620	*			ProShares VIX Mid-Term Futures ETF		222,845	*
					ProShares VIX Mid-Term Futures ETF		483,510	*			ProShares Short VIX Short-Term ETF		16,352,149	*
					ProShares Ultra VIX Short-Term Futures ETF		39,585,253	*
	Commodities Contracts		Receivables on open futures contracts, unrealized appreciation on swap and/or forward agreements		ProShares UltraShort Bloomberg Commodity		567,259		Payable on open futures contracts, unrealized depreciation on swap and/or forward agreements		ProShares UltraShort Gold		2,287,298	*
					ProShares UltraShort Bloomberg Crude Oil		42,824,680	*			ProShares UltraShort Silver		204,570
					ProShares UltraShort Bloomberg Natural Gas		3,941,465	*			ProShares Ultra Bloomberg Commodity		331,338
					ProShares UltraShort Silver		801,083	*			ProShares Ultra Bloomberg Crude Oil		122,655,884	*
					ProShares Ultra Gold		2,055,734	*			ProShares Ultra Bloomberg Natural Gas		34,889,283	*
											ProShares Ultra Silver		12,396,680	*
	Foreign Exchange Contracts		Unrealized appreciation on foreign currency forward contracts and receivables on open futures contracts		ProShares Short Euro		385,331	*	Unrealized depreciation on foreign currency forward contracts and payable on open futures contracts		ProShares UltraShort Euro		2,256,771
					ProShares UltraShort Australian Dollar		743,481	*			ProShares UltraShort Yen		2,149,924
					ProShares UltraShort Euro		19,019,765				ProShares Ultra Australian Dollar		96,825	*
					ProShares UltraShort Yen		571,149				ProShares Ultra Euro		106,292
					ProShares Ultra Euro		2,921				ProShares Ultra Yen
					ProShares Ultra Yen		404						15,649
					Total Trust	$	117,369,486	*			Total Trust	$	193,984,012	*
	*	Includes cumulative appreciation/depreciation of futures contracts as reported in the Schedules of Investments. Only current day’s variation margin is reported within the Statements of Financial Condition in receivable/payable on open futures contracts.
	Fair Value of Derivative Instruments
	as of December 31, 2013
	Asset Derivatives								Liability Derivatives
	Derivatives not		Statements of		Fund	Unrealized			Statements of		Fund	Unrealized
	accounted for as		Financial			Appreciation			Financial			Depreciation
	hedging instruments		Condition						Condition
			Location						Location
	VIX Futures Contracts		Receivables on open futures contracts		ProShares Short VIX Short-Term Futures ETF	$	8,116,955	*	Payable on open futures contracts		ProShares VIX Short-Term Futures ETF	$	16,652,686	*
											ProShares VIX Mid-Term Futures ETF		4,896,689	*
											ProShares Ultra VIX Short-Term Futures ETF		24,009,911	*
	Commodities Contracts		Receivables on open futures contracts, unrealized appreciation on swap and/or forward agreements		ProShares UltraShort Bloomberg Natural Gas		1,042,300	*	Payable on open futures contracts, unrealized depreciation on swap and/or forward agreements		ProShares UltraShort Bloomberg Commodity		27,665
					ProShares UltraShort Gold		5,647,573	*			ProShares UltraShort Bloomberg Crude Oil		3,565,673	*
					ProShares UltraShort Silver		14,200	*
											ProShares UltraShort Silver		2,227,857
					ProShares Ultra Bloomberg Commodity		15,078				ProShares Ultra Bloomberg Natural Gas		3,656,539	*
					ProShares Ultra Bloomberg Crude Oil		2,584,554	*			ProShares Ultra Gold		6,827,534	*
											ProShares Ultra Silver		2,507,080	*
	Foreign Exchange Contracts		Unrealized appreciation on foreign currency forward contracts and receivables on open futures contracts		ProShares UltraShort Australian Dollar		917,605	*	Unrealized depreciation on foreign currency forward contracts and payable on open futures contracts		ProShares Short Euro		33,231	*
					ProShares UltraShort Euro		151,351				ProShares UltraShort Euro		13,899,858
					ProShares UltraShort Yen		31,317,568				ProShares UltraShort Yen		1,930,884
					ProShares Ultra Euro		120,908				ProShares Ultra Australian Dollar		118,220	*
					ProShares Ultra Yen		4,052				ProShares Ultra Euro		19,946
											ProShares Ultra Yen		163,361
					Total Trust	$	49,932,144	*			Total Trust	$	80,537,134	*
	*	Includes cumulative appreciation/depreciation of futures contracts as reported in the Schedules of Investments. Only current day’s variation margin is reported within the Statements of Financial Condition in receivable/payable on open futures contracts.
Effect of Derivative Instruments on Statements of Operations	The Effect of Derivative Instruments on the Statements of Operations
	For the year ended December 31, 2014
	Derivatives not accounted for as		Location of Gain or		Fund	Realized Gain			Change in
	hedging instruments		(Loss) on Derivatives			or (Loss) on			Unrealized
			Recognized in Income			Derivatives			Appreciation or
						Recognized in			Depreciation on
						Income			Derivatives
									Recognized in
									Income
	Managed Futures Contracts		Net realized gain (loss) on futures contracts / changes in unrealized appreciation/ depreciation on futures contracts		ProShares Managed Futures Strategy	$	109,006		$	104,327
	VIX Futures Contracts		Net realized gain (loss) on futures contracts / changes in unrealized appreciation/ depreciation on futures contracts		ProShares VIX Short-Term Futures ETF		(694,347	)		22,917,306
					ProShares VIX Mid-Term Futures ETF		(14,378,810	)		5,157,354
					ProShares Short VIX Short-Term Futures ETF		76,925,998			(24,469,104	)
					ProShares Ultra VIX Short-Term Futures ETF		(139,412,525	)		63,595,164
	Commodity Contracts		Net realized gain (loss) on futures contracts, swap and/or forward agreements/changes in unrealized appreciation/ depreciation on futures contracts, swap and/or forward agreements		ProShares UltraShort Bloomberg Commodity		906,309			594,924
					ProShares UltraShort Bloomberg Crude Oil		99,327,097			46,390,353
					ProShares UltraShort Bloomberg Natural Gas		8,791,719			2,899,165
					ProShares UltraShort Gold		(5,316,482	)		(7,934,871	)
					ProShares UltraShort Silver		15,114,883			2,810,170
					ProShares Ultra Bloomberg Commodity		(1,065,622	)		(346,416	)
					ProShares Ultra Bloomberg Crude Oil		(243,325,957	)		(125,240,438	)
					ProShares Ultra Bloomberg Natural Gas		(6,464,796	)		(31,232,744	)
					ProShares Ultra Gold		(9,674,333	)		8,883,268
					ProShares Ultra Silver		(155,551,420	)		(9,889,600	)
	Foreign Exchange Contracts		Net realized gain (loss) on futures contracts and/or foreign currency forward contracts/changes in unrealized appreciation/ depreciation on futures contracts and/or foreign currency forward contracts		ProShares Short Euro		1,593,048			418,562
					ProShares UltraShort Australian Dollar		2,296,216			(174,124	)
					ProShares UltraShort Euro		83,678,955			30,511,501
					ProShares UltraShort Yen		127,846,225			(30,965,459	)
					ProShares Ultra Australian Dollar		(417,873	)		21,395
					ProShares Ultra Euro		(420,533	)		(204,333	)
					ProShares Ultra Yen		(540,398	)		144,064
					Total Trust	$	(160,673,640	)	$	(46,009,536	)
	The Effect of Derivative Instruments on the Statements of Operations
	For the year ended December 31, 2013
	Derivatives not accounted for as		Location of Gain or		Fund	Realized Gain			Change in
	hedging instruments		(Loss) on Derivatives			or (Loss) on			Unrealized
			Recognized in Income			Derivatives			Appreciation or
						Recognized in			Depreciation on
						Income			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 VIX Short-Term Futures ETF	$	(144,618,136	)	$	(16,431,267	)
					ProShares VIX Mid-Term Futures ETF		(28,219,863	)		(3,426,279	)
					ProShares Short VIX Short-Term Futures ETF		87,175,105			9,504,130
					ProShares Ultra VIX Short-Term Futures ETF		(405,816,676	)		(26,368,324	)
	Commodity Contracts		Net realized gain (loss) on futures contracts, swap and/or forward agreements/changes in unrealized appreciation/ depreciation on futures contracts, swap and/or forward agreements		ProShares UltraShort Bloomberg Commodity		760,002			(176,167	)
					ProShares UltraShort Bloomberg Crude Oil		(12,304,999	)		6,071,108
					ProShares UltraShort Bloomberg Natural Gas		(2,585,514	)		633,165
					ProShares UltraShort Gold		61,124,409			1,902,477
					ProShares UltraShort Silver		113,456,404			(21,561,362	)
					ProShares Ultra Bloomberg Commodity		(1,254,251	)		321,346
					ProShares Ultra Bloomberg Crude Oil		120,745,948			(52,709,476	)
					ProShares Ultra Bloomberg Natural Gas		41,418,165			160,411
					ProShares Ultra Gold		(165,632,786	)		8,839,764
					ProShares Ultra Silver		(701,532,729	)		143,273,646
	Foreign Exchange Contracts		Net realized gain (loss) on futures contracts and/or foreign currency forward contracts/changes in unrealized appreciation/ depreciation on futures contracts and/or foreign currency forward contracts		ProShares Short Euro		(381,987	)		21,825
					ProShares UltraShort Australian Dollar		2,720,079			832,015
					ProShares UltraShort Euro		(48,063,036	)		(600,935	)
					ProShares UltraShort Yen		164,019,598			(8,727,491	)
					ProShares Ultra Australian Dollar		(928,022	)		(19,190	)
					ProShares Ultra Euro		210,150			13,803
					ProShares Ultra Yen		(1,879,169	)		334,987
					Total Trust	$	(921,587,308	)	$	41,888,186
	The Effect of Derivative Instruments on the Statements of Operations
For the year ended December 31, 2012
Derivatives not accounted for as		Location of Gain or		Fund	Realized Gain			Change in
hedging instruments		(Loss) on Derivatives			or (Loss) on			Unrealized
		Recognized in Income			Derivatives			Appreciation or
					Recognized in			Depreciation on
					Income			Derivatives
								Recognized in
								Income
VIX Futures 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 VIX Short-Term Futures ETF	$	(160,953,587	)	$	1,354,551
				ProShares VIX Mid-Term Futures ETF		(75,241,919	)		4,642,340
				ProShares Short VIX Short-Term Futures ETF		13,203,419			(1,477,355	)
				ProShares Ultra VIX Short-Term Futures ETF		(509,421,864	)		3,121,203
Commodity Contracts		Net realized gain (loss) on futures contracts, swap and/or forward agreements/changes in unrealized appreciation/ depreciation on futures contracts, swap and/or forward agreements		ProShares UltraShort Bloomberg Commodity		761,879			(422,249	)
				ProShares UltraShort Bloomberg Crude Oil		47,564,763			(12,529,061	)
				ProShares UltraShort Bloomberg Natural Gas		1,212,600			(971,875	)
				ProShares UltraShort Gold		(10,067,498	)		(29,698,062	)
				ProShares UltraShort Silver		(28,114,972	)		(23,728,868	)
				ProShares Ultra Bloomberg Commodity		(536,107	)		400,909
				ProShares Ultra Bloomberg Crude Oil		(84,061,967	)		66,666,756
				ProShares Ultra Bloomberg Natural Gas		(2,839,309	)		(2,991,440	)
				ProShares Ultra Gold		(33,592,896	)		65,210,642
				ProShares Ultra Silver		(66,426,492	)		33,606,897
Foreign Exchange Contracts		Net realized gain (loss) on futures contracts and/or foreign currency forward contracts/changes in unrealized appreciation/ depreciation on futures contracts and/or foreign currency forward contracts		ProShares Short Euro		(164,400	)		(55,056	)
				ProShares UltraShort Australian Dollar		(288,740	)		85,590
				ProShares UltraShort Euro		46,946,419			(80,578,526	)
				ProShares UltraShort Yen		27,341,631			42,478,321
				ProShares Ultra Australian Dollar		265,990			(99,030	)
				ProShares Ultra Euro		(398,504	)		605,371
				ProShares Ultra Yen		(601,937	)		(597,023	)
				Total Trust	$	(835,413,491	)	$	65,024,035
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, 2014 and December 31, 2013:
	Fair Values of Derivative Instruments as of December 31, 2014
			Assets									Liabilities
			Gross			Gross			Net Amounts of			Gross			Gross		Net Amounts of
			Amounts of			Amounts			Assets			Amounts of			Amounts		Liabilities
			Recognized			Offset in the			presented in			Recognized			Offset in the		presented in
			Assets			Statements			the Statements			Liabilities			Statements		the Statements
			presented in			of Financial			of Financial			presented in			of Financial		of Financial
			the Statements			Condition			Condition			the Statements			Condition		Condition
			of Financial									of Financial
			Condition									Condition
	ProShares UltraShort Bloomberg Commodity
	Swap agreements			567,259			—			567,259			—			—		—
	ProShares UltraShort Bloomberg Crude Oil
	Swap agreements			27,018,077			—			27,018,077			—			—		—
	ProShares UltraShort Gold
	Forward agreements			—			—			—			2,282,778			—		2,282,778
	ProShares UltraShort Silver
	Forward agreements			799,523			—			799,523			204,570			—		204,570
	ProShares UltraShort Euro
	Foreign currency forward contracts			19,019,765			—			19,019,765			2,256,771			—		2,256,771
	ProShares UltraShort Yen
	Foreign currency forward contracts			571,149			—			571,149			2,149,924			—		2,149,924
	ProShares Ultra Bloomberg Commodity
	Swap agreements			—			—			—			331,338			—		331,338
	ProShares Ultra Bloomberg Crude Oil
	Swap agreements			—			—			—			76,181,097			—		76,181,097
	ProShares Ultra Gold
	Forward agreements			2,051,154			—			2,051,154			—			—		—
	ProShares Ultra Silver
	Forward agreements			—			—			—			12,395,120			—		12,395,120
	ProShares Ultra Euro
	Foreign currency forward contracts			2,921			—			2,921			106,292			—		106,292
	ProShares Ultra Yen
	Foreign currency forward contracts			404			—			404			15,649			—		15,649
	Fair Values of Derivative Instruments as of December 31, 2013
			Assets									Liabilities
			Gross			Gross			Net Amounts of			Gross			Gross		Net Amounts of
			Amounts of			Amounts			Assets			Amounts of			Amounts		Liabilities
			Recognized			Offset in the			presented in			Recognized			Offset in the		presented in
			Assets			Statements of			the Statements			Liabilities			Statements		the Statements
			presented in			Financial			of Financial			presented in			of Financial		of Financial
			the Statements			Condition			Condition			the Statements			Condition		Condition
			of Financial									of Financial
			Condition									Condition
	ProShares UltraShort Bloomberg Commodity
	Swap agreements			—			—			—			27,665			—		27,665
	ProShares UltraShort Bloomberg Crude Oil
	Swap agreements			—			—			—			2,332,900			—		2,332,900
	ProShares UltraShort Gold
	Forward agreements			5,633,053			—			5,633,053			—			—		—
	ProShares UltraShort Silver
	Forward agreements			—			—			—			2,227,857			—		2,227,857
	ProShares UltraShort Euro
	Foreign currency forward contracts			151,351			—			151,351			13,899,858			—		13,899,858
	ProShares UltraShort Yen
	Foreign currency forward contracts			31,317,568			—			31,317,568			1,930,884			—		1,930,884
	ProShares Ultra Bloomberg Commodity
	Swap agreements			15,078			—			15,078			—			—		—
	ProShares Ultra Bloomberg Crude Oil
	Swap agreements			1,957,893			—			1,957,893			—			—		—
	ProShares Ultra Gold
	Forward agreements			—			—			—			6,812,974			—		6,812,974
	ProShares Ultra Silver
Forward agreements			—			—			—			2,492,880			—		2,492,880
ProShares Ultra Euro
Foreign currency forward contracts			120,908			—			120,908			19,946			—		19,946
ProShares Ultra Yen
Foreign currency forward contracts			4,052			—			4,052			163,361			—		163,361
Gross Amounts Not Offset in the Statement 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, 2014. 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 due to timing differences related to market movements or due to minimum thresholds for collateral movement, as further described above under the caption “Accounting for Derivative Instruments”.
	Gross Amounts Not Offset in the Statement of Financial Condition
			Amounts of			Financial			Cash Collateral			Net Amount
			Recognized			Instruments for			for the Benefit of
			Assets /			the Benefit of			(the Funds) / the
			(Liabilities)			(the Funds) / the			Counterparties
			presented in the			Counterparties
			Statements of
			Financial
			Condition
	ProShares UltraShort Bloomberg Commodity
	Deutsche Bank AG			243,474			—			—			243,474
	Goldman Sachs International			240,271			—			—			240,271
	UBS AG			83,514			—			—			83,514
	ProShares UltraShort Bloomberg Crude Oil
	Deutsche Bank AG			7,669,493			—			(6,800,000	)		869,493
	Goldman Sachs International			8,362,336			(7,598,657	)		—			763,679
	Societe Generale S.A.			2,132,657			(2,132,657	)		—			—
	UBS AG			8,853,591			(8,281,350	)		—			572,241
	ProShares UltraShort Gold
	Deutsche Bank AG			(1,422,997	)		1,422,997			—			—
	Goldman Sachs International			(354,660	)		354,660			—			—
	Societe Generale S.A.			(182,225	)		182,225			—			—
	UBS AG			(322,896	)		322,896			—			—
	ProShares UltraShort Silver
	Deutsche Bank AG			462,619			—			(462,619	)		—
	Goldman Sachs International			138,563			(138,563	)		—			—
	Societe Generale S.A.			198,341			(198,341	)		—			—
	UBS AG			(204,570	)		204,570			—			—
	ProShares UltraShort Euro
	Goldman Sachs International			8,193,303			(6,008,925	)		—			2,184,378
	UBS AG			8,569,691			(6,592,366	)		(11,518	)		1,965,807
	ProShares UltraShort Yen
	Goldman Sachs International			(1,466,239	)		1,466,239			—			—
	UBS AG			(112,536	)		112,536			—			—
	ProShares Ultra Bloomberg Commodity
	Deutsche Bank AG			(143,751	)		143,751			—			—
	Goldman Sachs International			(138,532	)		138,532			—			—
	UBS AG			(49,055	)		49,055			—			—
	ProShares Ultra Bloomberg Crude Oil
	Deutsche Bank AG			(24,223,667	)		24,223,667			—			—
	Goldman Sachs International			(24,285,701	)		24,285,701			—			—
	Societe Generale S.A.			(5,528,160	)		5,528,160			—			—
	UBS AG			(22,143,569	)		22,143,569			—			—
	ProShares Ultra Gold
	Deutsche Bank AG			1,231,694			—			(1,231,694	)		—
	Goldman Sachs International			222,126			—			—			222,126
	Societe Generale S.A.			190,591			(190,591	)		—			—
	UBS AG			406,743			(406,743	)		—			—
	ProShares Ultra Silver
	Deutsche Bank AG			(6,220,069	)		6,220,069			—			—
	Goldman Sachs International			(2,124,796	)		2,124,796			—			—
	Societe Generale S.A.			(1,384,207	)		1,384,207			—			—
	UBS AG			(2,666,048	)		2,666,048			—			—
	ProShares Ultra Euro
	Goldman Sachs International			(38,856	)		38,856			—			—
	UBS AG			(64,515	)		64,515			—			—
	ProShares Ultra Yen
	Goldman Sachs International			(12,255	)		12,255			—			—
	UBS AG			(2,990	)		2,990			—			—
	Asset (Liability) amounts shown in the table below represent amounts owed to (by) the Funds for the derivative-related investments at December 31, 2013. 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 un-collateralized portions of these amounts at period end. These amounts may be un-collateralized due to timing differences related to market movements or due to minimum thresholds for collateral movement, as further described above under the caption “Accounting for Derivative Instruments”.
	Gross Amounts Not Offset in the Statement of Financial Condition
			Amounts of			Financial			Cash Collateral			Net Amount
			Recognized			Instruments for			for the Benefit of
Assets /			the Benefit of			(the Funds) / the
(Liabilities)			(the Funds) / the			Counterparties
presented in the			Counterparties
Statements of
Financial
Condition
ProShares UltraShort Bloomberg Commodity
Deutsche Bank AG			(11,710	)		11,710			—			—
Goldman Sachs International			(12,945	)		12,945			—			—
UBS AG			(3,010	)		3,010			—			—
ProShares UltraShort Bloomberg Crude Oil
Deutsche Bank AG			(570,114	)		570,114			—			—
Goldman Sachs International			(632,990	)		632,990			—			—
Societe Generale S.A.			(402,586	)		402,586			—			—
UBS AG			(727,210	)		727,210			—			—
ProShares UltraShort Gold
Deutsche Bank AG			2,258,281			—			(2,258,281	)		—
Goldman Sachs International			1,411,290			(1,411,290	)		—			—
Societe Generale S.A.			665,044			(665,044	)		—			—
UBS AG			1,298,438			(1,298,438	)		—			—
ProShares UltraShort Silver
Deutsche Bank AG			(445,752	)		445,752			—			—
Goldman Sachs International			(1,257,636	)		1,257,636			—			—
Societe Generale S.A.			(7,359	)		7,359			—			—
UBS AG			(517,110	)		517,110			—			—
ProShares UltraShort Euro
Goldman Sachs International			(6,756,698	)		6,756,698			—			—
UBS AG			(6,991,809	)		6,991,809			—			—
ProShares UltraShort Yen
Goldman Sachs International			14,831,469			(12,750,577	)		—			2,080,892
UBS AG			14,555,215			(12,958,891	)		—			1,596,324
ProShares Ultra Bloomberg Commodity
Deutsche Bank AG			6,454			—			—			6,454
Goldman Sachs International			4,974			—			—			4,974
UBS AG			3,650			—			—			3,650
ProShares Ultra Bloomberg Crude Oil
Deutsche Bank AG			622,117			—			(622,117	)		—
Goldman Sachs International			576,723			(576,723	)		—			—
Societe Generale S.A.			275,816			(275,816	)		—			—
UBS AG			483,237			(483,237	)		—			—
ProShares Ultra Gold
Deutsche Bank AG			(3,543,937	)		3,543,937			—			—
Goldman Sachs International			(1,327,335	)		1,327,335			—			—
Societe Generale S.A.			(785,038	)		785,038			—			—
UBS AG			(1,156,664	)		1,156,664			—			—
ProShares Ultra Silver
Deutsche Bank AG			(350,663	)		350,663			—			—
Goldman Sachs International			(1,345,433	)		1,345,433			—			—
Societe Generale S.A.			(28,581	)		28,581			—			—
UBS AG			(768,203	)		768,203			—			—
ProShares Ultra Euro
Goldman Sachs International			37,221			—			—			37,221
UBS AG			63,741			—			—			63,741
ProShares Ultra Yen
Goldman Sachs International			(75,847	)		75,847			—			—
UBS AG			(83,462	)		83,462			—			—

Creation_and_Redemption_of_Cre1

Creation and Redemption of Creation Units (Tables)	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
Schedule of Transaction Fees	Transaction fees for the years ended December 31, 2014, 2013 and 2012, which are included in the Sale and/or Redemption of Shares on the Statements of Changes in Shareholders’ Equity, were as follows:
	Fund		Year Ended		Year Ended		Year Ended
			December 31, 2014		December 31, 2013		December 31, 2012
	Managed Futures Strategy*		$	—	$	—	$	—
	VIX Short-Term Futures ETF			72,020		—		—
	VIX Mid-Term Futures ETF			8,927		—		—
	Short VIX Short-Term Futures ETF			218,121		130,779		119,942
	Ultra VIX Short-Term Futures ETF			734,298		814,195		639,726
	UltraShort Bloomberg Commodity			—		—		1,344
	UltraShort Bloomberg Crude Oil			257,458		298,261		120,983
	UltraShort Bloomberg Natural Gas			26,053		7,434		6,200
	UltraShort Gold			32,473		105,508		15,695
	UltraShort Silver			48,832		128,850		148,662
	Short Euro**			—		—		—
	UltraShort Australian Dollar***			—		—		—
	UltraShort Euro			—		—		—
	UltraShort Yen			—		—		—
	Ultra Bloomberg Commodity			249		487		603
	Ultra Bloomberg Crude Oil			299,493		236,956		317,803
	Ultra Bloomberg Natural Gas			30,073		42,172		19,179
	Ultra Gold			12,088		23,035		26,057
	Ultra Silver			65,208		107,285		164,212
	Ultra Australian Dollar***			—		—		—
	Ultra Euro			—		—		—
	Ultra Yen			—		—		—
	Total Trust		$	1,805,293	$	1,894,962	$	1,580,406
	*	Fund commenced investment operations on October 1, 2014.
	**	Fund commenced investment operations on June 26, 2012.
	***	Fund commenced investment operations on July 17, 2012.

Financial_Highlights_Tables

Financial Highlights (Tables)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Per Share Operating Performance	Selected data for a Share outstanding throughout the year ended December 31, 2014:
	For the Year Ended December 31, 2014
	Per Share Operating Performance		Managed			VIX Short-			VIX Mid-			Short VIX			Ultra VIX			UltraShort			UltraShort
			Futures			Term Futures			Term Futures			Short-Term			Short-Term			Bloomberg			Bloomberg
			Strategy+			ETF			ETF*			Futures ETF			Futures ETF			Commodity			Crude Oil
	Net asset value, beginning of period		$	20		$	28.5387		$	77.1837		$	67.4993		$	67.0841		$	63.2936		$	31.7301
	Net investment income (loss)			(0.0417	)		(0.2047	)		(0.5666	)		(1.0247	)		(0.5811	)		(0.5679	)		(0.2773	)
	Net realized and unrealized gain (loss)#			1.1771			(7.4019	)		(13.0151	)		(5.0742	)		(41.4112	)		25.0238			46.5262
	Change in net asset value from operations			1.1354			(7.6066	)		(13.5817	)		(6.0989	)		(41.9923	)		24.4559			46.2489
	Net asset value, at December 31, 2014		$	21.1354		$	20.9321		$	63.602		$	61.4004		$	25.0918		$	87.7495		$	77.979
	Market value per share, at December 31, 2013†		$	—		$	28.53		$	77.16		$	67.47		$	67.12		$	58.41		$	31.58
	Market value per share, at December 31, 2014†		$	21.28		$	20.99		$	63.89		$	61.16		$	25.15		$	87.44		$	76.52
	Total Return, at net asset value			5.7	%^		(26.7	)%		(17.6	)%		(9.0	)%		(62.6	)%		38.6	%		145.8	%
	Total Return, at market value			6.4	%^		(26.4	)%		(17.2	)%		(9.4	)%		(62.5	)%		49.7	%		142.3	%
	Ratios to Average Net Assets
	Expense ratio			(0.82	)%**		(0.92	)%		(0.87	)%		(1.49	)%		(1.80	)%		(0.95	)%		(0.98	)%
	Expense ratio, excluding brokerage commissions			(0.75	)%**		(0.85	)%		(0.85	)%		(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%
	Net investment income (loss)			(0.82	)%**		(0.88	)%		(0.84	)%		(1.46	)%		(1.78	)%		(0.92	)%		(0.94	)%
	*	See Note 1 of these Notes to Financial Statements.
	+	From commencement of operations, October 1, 2014, through December 31, 2014.
	#	The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period.
	†	Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds’ net asset value is calculated.
	^	Percentages are not annualized for the period ended December 31, 2014. The return for a share outstanding for 2014 is calculated based on the initial offering price upon commencement of investment operations of $20.0000 for ProShares Managed Futures Strategy.
	**	Percentages are annualized.
	For the Year Ended December 31, 2014
	Per Share Operating Performance		UltraShort			UltraShort			UltraShort			Short Euro			UltraShort			UltraShort			UltraShort
			Bloomberg			Gold			Silver						Australian			Euro			Yen
			Natural Gas												Dollar
	Net asset value, at December 31, 2013		$	69.9635		$	103.518		$	89.782		$	35.5867		$	46.6384		$	17.0613		$	70.864
	Net investment income (loss)			(0.4961	)		(0.8233	)		(0.7875	)		(0.3428	)		(0.4272	)		(0.1642	)		(0.6412	)
	Net realized and unrealized gain (loss)#			14.4903			(6.0431	)		26.6198			4.8178			5.1678			4.6975			19.1108
	Change in net asset value from operations			13.9942			(6.8664	)		25.8323			4.475			4.7406			4.5333			18.4696
	Net asset value, at December 31, 2014		$	83.9577		$	96.6516		$	115.6143		$	40.0617		$	51.379		$	21.5946		$	89.3336
	Market value per share, at December 31, 2013†		$	69.36		$	103.53		$	90.19		$	35.66		$	46.66		$	17.06		$	70.91
	Market value per share, at December 31, 2014†		$	82.03		$	100.22		$	119.39		$	40.03		$	51.37		$	21.61		$	89.3
	Total Return, at net asset value			20	%		(6.6	)%		28.8	%		12.6	%		10.2	%		26.6	%		26.1	%
	Total Return, at market value			18.3	%		(3.2	)%		32.4	%		12.3	%		10.1	%		26.7	%		25.9	%
	Ratios to Average Net Assets
	Expense ratio			(1.18	)%		(0.95	)%		(0.95	)%		(0.96	)%		(1.01	)%		(0.95	)%		(0.95	)%
	Expense ratio, excluding brokerage commissions			(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%
	Net investment income (loss)			(1.14	)%		(0.91	)%		(0.90	)%		(0.93	)%		(0.97	)%		(0.90	)%		(0.90	)%
	#	The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period.
	†	Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds’ net asset value is calculated.
	For the Year Ended December 31, 2014
	Per Share Operating Performance		Ultra			Ultra			Ultra			Ultra Gold			Ultra Silver			Ultra			Ultra Euro			Ultra Yen
			Bloomberg			Bloomberg			Bloomberg									Australian
			Commodity			Crude Oil			Natural Gas									Dollar
	Net asset value, at December 31, 2013		$	19.4317		$	32.0899		$	38.8383		$	41.2553		$	63.3305		$	31.6801		$	26.0346		$	18.6318
	Net investment income (loss)			(0.1762	)		(0.2186	)		(0.3792	)		(0.4078	)		(0.5348	)		(0.3111	)		(0.2185	)		(0.1673	)
	Net realized and unrealized gain (loss)#			(6.2218	)		(21.7233	)		(23.0468	)		(0.8464	)		(23.4300	)		(3.9687	)		(5.9417	)		(4.3456	)
	Change in net asset value from operations			(6.3980	)		(21.9419	)		(23.4260	)		(1.2542	)		(23.9648	)		(4.2798	)		(6.1602	)		(4.5129	)
	Net asset value, at December 31, 2014		$	13.0337		$	10.148		$	15.4123		$	40.0011		$	39.3657		$	27.4003		$	19.8744		$	14.1189
	Market value per share, at December 31, 2013†		$	19.13		$	32.22		$	39.28		$	41.26		$	63.04		$	31.61		$	25.98		$	18.61
	Market value per share, at December 31, 2014†		$	12.86		$	10.37		$	15.78		$	38.41		$	38.05		$	27.43		$	19.8		$	14.12
	Total Return, at net asset value			(32.9	)%		(68.4	)%		(60.3	)%		(3.0	)%		(37.8	)%		(13.5	)%		(23.7	)%		(24.2	)%
	Total Return, at market value			(32.8	)%		(67.8	)%		(59.8	)%		(6.9	)%		(39.6	)%		(13.2	)%		(23.8	)%		(24.1	)%
	Ratios to Average Net Assets
	Expense ratio			(0.95	)%		(0.99	)%		(1.13	)%		(0.95	)%		(0.95	)%		(1.00	)%		(0.95	)%		(0.95	)%
	Expense ratio, excluding brokerage commissions			(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%
	Net investment income (loss)			(0.91	)%		(0.95	)%		(1.10	)%		(0.91	)%		(0.91	)%		(0.94	)%		(0.91	)%		(0.90	)%
	#	The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period.
	†	Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds’ net asset value is calculated.
	Selected data for a Share outstanding throughout the year ended December 31, 2013:
	For the Year Ended December 31, 2013
Per Share Operating Performance		VIX Short-			VIX Mid-			Short VIX			Ultra VIX			UltraShort			UltraShort			UltraShort
		Term Futures			Term Futures			Short-Term			Short-Term			Bloomberg			Bloomberg			Bloomberg
		ETF*			ETF*			Futures ETF*			Futures ETF*			Commodity			Crude Oil			Natural Gas*
Net asset value, at December 31, 2012		$	83.9374		$	138.8013		$	33.0649		$	805.2711		$	54.1021		$	40.3079		$	102.1402
Net investment income (loss)			(0.3518	)		(0.7892	)		(0.7398	)		(3.0009	)		(0.5355	)		(0.3033	)		(0.9217	)
Net realized and unrealized gain (loss)#			(55.0469	)		(60.8284	)		35.1742			(735.1861	)		9.727			(8.2745	)		(31.2550	)
Change in net asset value from operations			(55.3987	)		(61.6176	)		34.4344			(738.1870	)		9.1915			(8.5778	)		(32.1767	)
Net asset value, at December 31, 2013		$	28.5387		$	77.1837		$	67.4993		$	67.0841		$	63.2936		$	31.7301		$	69.9635
Market value per share, at December 31, 2012†		$	85.05		$	136.88		$	32.73		$	836		$	51.64		$	40.44		$	101.64
Market value per share, at December 31, 2013†		$	28.53		$	77.16		$	67.47		$	67.12		$	58.41		$	31.58		$	69.36
Total Return, at net asset value			(66.0	)%		(44.4	)%		104.1	%		(91.7	)%		17	%		(21.3	)%		(31.5	)%
Total Return, at market value			(66.5	)%		(43.6	)%		106.2	%		(92.0	)%		13.1	%		(21.9	)%		(31.8	)%
Ratios to Average Net Assets
Expense ratio			(0.85	)%		(0.85	)%		(1.53	)%		(1.82	)%		(0.95	)%		(0.98	)%		(1.20	)%
Expense ratio, excluding brokerage commissions			(0.85	)%		(0.85	)%		(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%
Net investment income (loss)			(0.81	)%		(0.81	)%		(1.49	)%		(1.80	)%		(0.90	)%		(0.94	)%		(1.15	)%
*	See Note 1 of these Notes to Financial Statements.
#	The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period.
†	Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds’ net asset value is calculated.
For the Year Ended December 31, 2013
Per Share Operating Performance		UltraShort			UltraShort			Short Euro			UltraShort			UltraShort			UltraShort			Ultra
		Gold			Silver						Australian			Euro			Yen			Bloomberg
											Dollar									Commodity
Net asset value, at December 31, 2012		$	63.8688		$	51.3951		$	37.6285		$	37.8081		$	19.0172		$	50.7577		$	24.3875
Net investment income (loss)			(0.7561	)		(0.6223	)		(0.3430	)		(0.4325	)		(0.1677	)		(0.5662	)		(0.1945	)
Net realized and unrealized gain (loss)#			40.4053			39.0092			(1.6988	)		9.2628			(1.7882	)		20.6725			(4.7613	)
Change in net asset value from operations			39.6492			38.3869			(2.0418	)		8.8303			(1.9559	)		20.1063			(4.9558	)
Net asset value, at December 31, 2013		$	103.518		$	89.782		$	35.5867		$	46.6384		$	17.0613		$	70.864		$	19.4317
Market value per share, at December 31, 2012†		$	62.6		$	50.07		$	37.64		$	37.74		$	19.01		$	50.77		$	23.93
Market value per share, at December 31, 2013†		$	103.53		$	90.19		$	35.66		$	46.66		$	17.06		$	70.91		$	19.13
Total Return, at net asset value			62.1	%		74.7	%		(5.4	)%		23.4	%		(10.3	)%		39.6	%		(20.3	)%
Total Return, at market value			65.4	%		80.1	%		(5.3	)%		23.6	%		(10.3	)%		39.7	%		(20.1	)%
Ratios to Average Net Assets
Expense ratio			(0.95	)%		(0.95	)%		(0.96	)%		(1.02	)%		(0.95	)%		(0.95	)%		(0.95	)%
Expense ratio, excluding brokerage commissions			(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%
Net investment income (loss)			(0.90	)%		(0.89	)%		(0.93	)%		(0.99	)%		(0.90	)%		(0.91	)%		(0.90	)%
#	The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period.
†	Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds’ net asset value is calculated.
For the Year Ended December 31, 2013
Per Share Operating Performance		Ultra			Ultra			Ultra Gold			Ultra Silver*			Ultra			Ultra Euro			Ultra Yen
		Bloomberg			Bloomberg									Australian
		Crude Oil			Natural Gas									Dollar
Net asset value, at December 31, 2012		$	29.3941		$	39.049		$	83.7634		$	171.8906		$	41.4986		$	24.3499		$	28.184
Net investment income (loss)			(0.2849	)		(0.4054	)		(0.5404	)		(0.8789	)		(0.3490	)		(0.2200	)		(0.1996	)
Net realized and unrealized gain (loss)#			2.9807			0.1947			(41.9677	)		(107.6812	)		(9.4695	)		1.9047			(9.3526	)
Change in net asset value from operations			2.6958			(0.2107	)		(42.5081	)		(108.5601	)		(9.8185	)		1.6847			(9.5522	)
Net asset value, at December 31, 2013		$	32.0899		$	38.8383		$	41.2553		$	63.3305		$	31.6801		$	26.0346		$	18.6318
Market value per share, at December 31, 2012†		$	29.32		$	39.24		$	85.34		$	176.4		$	41.45		$	24.32		$	28.28
Market value per share, at December 31, 2013†		$	32.22		$	39.28		$	41.26		$	63.04		$	31.61		$	25.98		$	18.61
Total Return, at net asset value			9.2	%		(0.5	)%		(50.7	)%		(63.2	)%		(23.7	)%		6.9	%		(33.9	)%
Total Return, at market value			9.9	%		0.1	%		(51.7	)%		(64.3	)%		(23.7	)%		6.8	%		(34.2	)%
Ratios to Average Net Assets
Expense ratio			(0.97	)%		(1.15	)%		(0.95	)%		(0.95	)%		(0.99	)%		(0.95	)%		(0.95	)%
Expense ratio, excluding brokerage commissions			(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%
Net investment income (loss)			(0.92	)%		(1.10	)%		(0.89	)%		(0.89	)%		(0.95	)%		(0.90	)%		(0.90	)%
#	The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period.
†	Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds’ net asset value is calculated.
Selected data for a Share outstanding throughout the year ended December 31, 2012:
For the Year Ended December 31, 2012
Per Share Operating Performance		VIX Short-			VIX Mid-			Short VIX			Ultra VIX Short-			UltraShort			UltraShort			UltraShort
		Term Futures			Term Futures			Short-Term			Term Futures			Bloomberg			Bloomberg			Bloomberg
		ETF*			ETF*			Futures ETF*			ETF*			Commodity			Crude Oil			Natural Gas*
Net asset value, at December 31, 2011		$	381.869		$	296.5588		$	12.9332		$	29,673.01		$	56.9207		$	38.8151		$	95.2206
Net investment income (loss)			(1.0285	)		(1.6200	)		(0.4190	)		(38.4329	)		(0.4894	)		(0.3595	)		(1.5571	)
Net realized and unrealized gain (loss)#			(296.9031	)		(156.1375	)		20.5507			(28,829.3080	)		(2.3292	)		1.8523			8.4767
Change in net asset value from operations			(297.9316	)		(157.7575	)		20.1317			(28,867.7409	)		(2.8186	)		1.4928			6.9196
Net asset value, at December 31, 2012		$	83.9374		$	138.8013		$	33.0649		$	805.2711		$	54.1021		$	40.3079		$	102.1402
Market value per share, at December 31, 2011†		$	378.7		$	296.52		$	13.07		$	29,184.00		$	56.19		$	38.69		$	95.84
Market value per share, at December 31, 2012†		$	85.05		$	136.88		$	32.73		$	836		$	51.64		$	40.44		$	101.64
Total Return, at net asset value			(78.0	)%		(53.2	)%		155.7	%		(97.3	)%		(5.0	)%		3.8	%		7.3	%
Total Return, at market value			(77.5	)%		(53.8	)%		150.4	%		(97.1	)%		(8.1	)%		4.5	%		6.1	%
Ratios to Average Net Assets
Expense ratio			(0.85	)%		(0.85	)%		(1.63	)%		(1.77	)%		(0.95	)%		(0.98	)%		(1.39	)%
Expense ratio, excluding brokerage commissions			(0.85	)%		(0.85	)%		(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%
Net investment income (loss)			(0.79	)%		(0.80	)%		(1.56	)%		(1.73	)%		(0.89	)%		(0.91	)%		(1.33	)%
*	See Note 1 of these Notes to Financial Statements.
#	The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period.
†	Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds’ net asset value is calculated.
For the Year Ended December 31, 2012
Per Share Operating Performance		UltraShort			UltraShort			Short Euro+			UltraShort			UltraShort			UltraShort			Ultra
		Gold*			Silver*						Australian			Euro			Yen			Bloomberg
											Dollar++									Commodity
Net asset value, at beginning of period		$	82.7114		$	76.6771		$	40		$	40		$	20.3357		$	40.9557		$	25.8805
Net investment income (loss)			(0.5901	)		(0.4806	)		(0.1799	)		(0.1633	)		(0.1804	)		(0.3847	)		(0.2291	)
Net realized and unrealized gain (loss)#			(18.2525	)		(24.8014	)		(2.1916	)		(2.0286	)		(1.1381	)		10.1867			(1.2639	)
Change in net asset value from operations			(18.8426	)		(25.2820	)		(2.3715	)		(2.1919	)		(1.3185	)		9.802			(1.4930	)
Net asset value, at December 31, 2012		$	63.8688		$	51.3951		$	37.6285		$	37.8081		$	19.0172		$	50.7577		$	24.3875
Market value per share, at December 31, 2011†		$	79.24		$	79.35		$	40		$	40		$	20.35		$	40.95		$	25.64
Market value per share, at December 31, 2012†		$	62.6		$	50.07		$	37.64		$	37.74		$	19.01		$	50.77		$	23.93
Total Return, at net asset value			(22.8	)%		(33.0	)%		(5.9	)% ^		(5.5	)% ^		(6.5	)%		23.9	%		(5.8	)%
Total Return, at market value			(21.0	)%		(36.9	)%		(5.9	)% ^		(5.7	)% ^		(6.6	)%		24	%		(6.7	)%
Ratios to Average Net Assets
Expense ratio			(0.95	)%		(0.95	)%		(0.96	)%**		(1.00	)%**		(0.95	)%		(0.95	)%		(0.95	)%
Expense ratio, excluding brokerage commissions			(0.95	)%		(0.95	)%		(0.95	)%**		(0.95	)%**		(0.95	)%		(0.95	)%		(0.95	)%
Net investment income (loss)			(0.89	)%		(0.89	)%		(0.89	)%**		(0.92	)%**		(0.89	)%		(0.88	)%		(0.89	)%
+	From commencement of operations, June 26, 2012, through December 31, 2012.
++	From commencement of operations, July 17, 2012, through December 31, 2012.
#	The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period.
†	Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds’ net asset value is calculated.
^	Percentages are not annualized for the period ended December 31, 2012.
**	Percentages are annualized.
For the Year Ended December 31, 2012
Per Share Operating Performance		Ultra			Ultra			Ultra Gold			Ultra Silver*			Ultra			Ultra Euro			Ultra Yen+
		Bloomberg			Bloomberg									Australian
		Crude Oil			Natural Gas*									Dollar+
Net asset value, at beginning of period		$	40.8828		$	101.9786		$	75.9066		$	172.7611		$	40		$	23.886		$	36.4704
Net investment income (loss)			(0.2904	)		(0.5205	)		(0.7680	)		(1.7289	)		(0.1740	)		(0.2106	)		(0.2962	)
Net realized and unrealized gain (loss)#			(11.1983	)		(62.4091	)		8.6248			0.8584			1.6726			0.6745			(7.9902	)
Change in net asset value from operations			(11.4887	)		(62.9296	)		7.8568			(0.8705	)		1.4986			0.4639			(8.2864	)
Net asset value, at December 31, 2012		$	29.3941		$	39.049		$	83.7634		$	171.8906		$	41.4986		$	24.3499		$	28.184
Market value per share, at December 31, 2011†		$	40.94		$	101.35		$	79.01		$	166.6		$	40		$	23.87		$	36.5
Market value per share, at December 31, 2012†		$	29.32		$	39.24		$	85.34		$	176.4		$	41.45		$	24.32		$	28.28
Total Return, at net asset value			(28.1	)%		(61.7	)%		10.4	%		(0.5	)%		3.7	% ^		1.9	%		(22.7	)%
Total Return, at market value			(28.4	)%		(61.3	)%		8	%		5.9	%		3.6	% ^		1.9	%		(22.5	)%
Ratios to Average Net Assets
Expense ratio			(0.97	)%		(1.21	)%		(0.95	)%		(0.95	)%		(1.00	)%**		(0.95	)%		(0.95	)%
Expense ratio, excluding brokerage commissions			(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%		(0.95	)%**		(0.95	)%		(0.95	)%
Net investment income (loss)			(0.91	)%		(1.15	)%		(0.88	)%		(0.88	)%		(0.92	)%**		(0.90	)%		(0.88	)%
*	See Note 1 of these Notes to Financial Statements.
+	From commencement of operations, July 17, 2012, through December 31, 2012.
#	The amount shown for a share outstanding throughout the period may not accord with the change in aggregate gains and losses during the period because of timing of creation and redemption units in relation to fluctuating net asset value during the period.
†	Market values are determined at the close of the New York Stock Exchange, which may be later than when the Funds’ net asset value is calculated.
^	Percentages are not annualized for the period ended December 31, 2012.
**	Percentage are annualized.

Schedule_of_Investments_Future

Schedule of Investments - Futures Contracts Purchased (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
	Contract		Contract
ProShares Managed Futures Strategy [Member] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)	($7,380)	[1],[2]
ProShares Managed Futures Strategy [Member] | Coffee 'C' Futures - ICE, Expires March 2015 [Member] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Number of Contracts	1	[1],[2]
Notional Amount at Value	62,475	[1],[2]
Unrealized Appreciation (Depreciation)	-5,231	[1],[2]
ProShares Managed Futures Strategy [Member] | Soybean Futures - CBT, Expires March 2015 [Member] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Number of Contracts	3	[1],[2]
Notional Amount at Value	153,525	[1],[2]
Unrealized Appreciation (Depreciation)	-2,350	[1],[2]
ProShares Managed Futures Strategy [Member] | US Treasury Long Bond Futures - CBT, Expires March 2015 [Member] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Number of Contracts	3	[1],[2]
Notional Amount at Value	433,688	[1],[2]
Unrealized Appreciation (Depreciation)	5,750	[1],[2]
ProShares Managed Futures Strategy [Member] | US 10 YR Note Futures - CBT, Expires March 2015 [Member] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Number of Contracts	6	[1],[2]
Notional Amount at Value	760,781	[1],[2]
Unrealized Appreciation (Depreciation)	4,536	[1],[2]
ProShares Managed Futures Strategy [Member] | Live Cattle Futures - CME, Expires April 2015 [Member] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Number of Contracts	5	[1],[2]
Notional Amount at Value	324,800	[1],[2]
Unrealized Appreciation (Depreciation)	-930	[1],[2]
ProShares Managed Futures Strategy [Member] | Corn Futures - CBT, Expires July 2015 [Member] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Number of Contracts	6	[1],[2]
Notional Amount at Value	123,750	[1],[2]
Unrealized Appreciation (Depreciation)	838	[1],[2]
ProShares Managed Futures Strategy [Member] | Wheat Futures - CBT, Expires December 2015 [Member] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Number of Contracts	4	[1],[2]
Notional Amount at Value	122,950	[1],[2]
Unrealized Appreciation (Depreciation)	-1,013	[1],[2]
ProShares Managed Futures Strategy [Member] | Natural Gas Futures - NYMEX, Expires January 2016 [Member] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Number of Contracts	3	[1],[2]
Notional Amount at Value	105,930	[1],[2]
Unrealized Appreciation (Depreciation)	-8,980	[1],[2]
ProShares VIX Short-Term Futures ETF [Member] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)	6,264,620	[3]	-16,652,686	[4]
ProShares VIX Short-Term Futures ETF [Member] | VIX Futures - CBOE, Expires January 2015 [Member] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Number of Contracts	3,326	[3]
Notional Amount at Value	59,951,150	[3]
Unrealized Appreciation (Depreciation)	3,425,757	[3]
ProShares VIX Short-Term Futures ETF [Member] | VIX Futures - CBOE, Expires February 2015 [Member] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Number of Contracts	2,775	[3]
Notional Amount at Value	50,574,375	[3]
Unrealized Appreciation (Depreciation)	2,838,863	[3]
ProShares VIX Short-Term Futures ETF [Member] | VIX Futures - CBOE, Expires January 2014 [Member] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Number of Contracts			11,195	[4]
Notional Amount at Value			156,170,250	[4]
Unrealized Appreciation (Depreciation)			-14,731,214	[4]
ProShares VIX Short-Term Futures ETF [Member] | VIX Futures - CBOE, Expires February 2014 [Member] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Number of Contracts			7,748	[4]
Notional Amount at Value			114,283,000	[4]
Unrealized Appreciation (Depreciation)			-1,921,472	[4]
ProShares VIX Mid-Term Futures ETF [Member] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)	260,665	[5]	-4,896,689	[6]
ProShares VIX Mid-Term Futures ETF [Member] | VIX Futures - CBOE, Expires April 2015 [Member] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Number of Contracts	205	[5]
Notional Amount at Value	3,818,125	[5]
Unrealized Appreciation (Depreciation)	-222,845	[5]
ProShares VIX Mid-Term Futures ETF [Member] | VIX Futures - CBOE, Expires May 2015 [Member] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Number of Contracts	376	[5]
Notional Amount at Value	7,097,000	[5]
Unrealized Appreciation (Depreciation)	302,905	[5]
ProShares VIX Mid-Term Futures ETF [Member] | Vix Futures Cboe Expires June Two Thousand and Fifteen [Member ] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Number of Contracts	376	[5]
Notional Amount at Value	7,191,000	[5]
Unrealized Appreciation (Depreciation)	54,730	[5]
ProShares VIX Mid-Term Futures ETF [Member] | Vix Futures Cboe Expires July Two Thousand and Fifteen [Member ] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Number of Contracts	172	[5]
Notional Amount at Value	3,349,700	[5]
Unrealized Appreciation (Depreciation)	125,875	[5]
ProShares VIX Mid-Term Futures ETF [Member] | VIX Futures - CBOE, Expires April 2014 [Member] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Number of Contracts			594	[6]
Notional Amount at Value			9,652,500	[6]
Unrealized Appreciation (Depreciation)			-1,429,410	[6]
ProShares VIX Mid-Term Futures ETF [Member] | VIX Futures - CBOE, Expires May 2014 [Member] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Number of Contracts			1,005	[6]
Notional Amount at Value			16,884,000	[6]
Unrealized Appreciation (Depreciation)			-2,133,680	[6]
ProShares VIX Mid-Term Futures ETF [Member] | VIX Futures - CBOE, Expires June 2014 [Member] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Number of Contracts			1,005	[6]
Notional Amount at Value			17,336,250	[6]
Unrealized Appreciation (Depreciation)			-1,205,329	[6]
ProShares VIX Mid-Term Futures ETF [Member] | VIX Futures - CBOE, Expires July 2014 [Member] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Number of Contracts			411	[6]
Notional Amount at Value			7,274,700	[6]
Unrealized Appreciation (Depreciation)			-128,270	[6]
ProShares Ultra VIX Short-Term Futures ETF [Member] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)	39,585,253	[7]	-24,009,911	[8]
ProShares Ultra VIX Short-Term Futures ETF [Member] | VIX Futures - CBOE, Expires January 2015 [Member] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Number of Contracts	21,092	[7]
Notional Amount at Value	380,183,300	[7]
Unrealized Appreciation (Depreciation)	22,932,077	[7]
ProShares Ultra VIX Short-Term Futures ETF [Member] | VIX Futures - CBOE, Expires February 2015 [Member] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Number of Contracts	17,586	[7]
Notional Amount at Value	320,497,650	[7]
Unrealized Appreciation (Depreciation)	16,653,176	[7]
ProShares Ultra VIX Short-Term Futures ETF [Member] | VIX Futures - CBOE, Expires January 2014 [Member] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Number of Contracts			18,727	[8]
Notional Amount at Value			261,241,650	[8]
Unrealized Appreciation (Depreciation)			-21,472,637	[8]
ProShares Ultra VIX Short-Term Futures ETF [Member] | VIX Futures - CBOE, Expires February 2014 [Member] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Number of Contracts			12,964	[8]
Notional Amount at Value			191,219,000	[8]
Unrealized Appreciation (Depreciation)			-2,537,274	[8]
ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)	-76,181,097	[9]	1,957,893	[10]
ProShares Ultra Bloomberg Crude Oil [Member] | Crude Oil - NYMEX, Expires March 2014 [Member] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Number of Contracts			1,103	[11]
Notional Amount at Value			108,700,650	[11]
Unrealized Appreciation (Depreciation)			626,661	[11]
ProShares Ultra Bloomberg Crude Oil [Member] | Crude Oil - NYMEX, Expires March 2015 [Member] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Number of Contracts	7,232	[12]
Notional Amount at Value	388,358,400	[12]
Unrealized Appreciation (Depreciation)	-46,474,787	[12]
Proshares Ultra Bloomberg Natural Gas [Member] | Natural Gas - NYMEX, Expires March 2014 [Member] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Number of Contracts			3,001	[13]
Notional Amount at Value			125,831,930	[13]
Unrealized Appreciation (Depreciation)			-3,656,539	[13]
Proshares Ultra Bloomberg Natural Gas [Member] | Natural Gas - NYMEX, Expires March 2015 [Member] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Number of Contracts	4,864	[14]
Notional Amount at Value	140,861,440	[14]
Unrealized Appreciation (Depreciation)	-34,889,283	[14]
ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)	2,051,154	[9]	-6,812,974	[10]
ProShares Ultra Gold [Member] | Gold Futures - COMEX, Expires February 2014 [Member] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Number of Contracts			2	[15]
Notional Amount at Value			240,460	[15]
Unrealized Appreciation (Depreciation)			-14,560	[15]
ProShares Ultra Gold [Member] | Gold Futures - COMEX, Expires February 2015 [Member] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Number of Contracts	2	[16]
Notional Amount at Value	236,820	[16]
Unrealized Appreciation (Depreciation)	4,580	[16]
ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)	-12,395,120		-2,492,880	[10]
ProShares Ultra Silver [Member] | Silver Futures - COMEX, Expires March 2014 [Member]
Schedule of Investments [Line Items]
Number of Contracts			2	[17]
Notional Amount at Value			193,700	[17]
Unrealized Appreciation (Depreciation)			-14,200	[17]
ProShares Ultra Silver [Member] | Silver Futures - COMEX, Expires March 2015 [Member] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Number of Contracts	2
Notional Amount at Value	155,990
Unrealized Appreciation (Depreciation)	-1,560
ProShares Ultra Australian Dollar [Member] | Australian Dollar Fx Currency Futures - CME, Expires March 2014 [Member] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Number of Contracts			71	[18]
Notional Amount at Value			6,306,220	[18]
Unrealized Appreciation (Depreciation)			-118,220	[18]
ProShares Ultra Australian Dollar [Member] | Australian Dollar Fx Currency Futures - CME, Expires March 2015 [Member] | Futures Contracts Purchased [Member]
Schedule of Investments [Line Items]
Number of Contracts	67	[19]
Notional Amount at Value	5,441,740	[19]
Unrealized Appreciation (Depreciation)	($96,825)	[19]
[1]	Cash collateral in the amount of $195,142 was pledged to cover margin requirements for open futures contracts as of December 31, 2014.
[2]	Since the Fund commenced investment operations on October 1, 2014, the Schedule of Investments as of December 31, 2013 has not been provided.
[3]	Cash collateral in the amount of $18,439,750 was pledged to cover margin requirements for open futures contracts as of December 31, 2014.
[4]	Cash collateral in the amount of $64,020,350 was pledged to cover margin requirements for open futures contracts as of December 31, 2013.
[5]	Cash collateral in the amount of $ 1,906,950 was pledged to cover margin requirements for open futures contracts as of December 31, 2014.
[6]	Cash collateral in the amount of $8,454,390 was pledged to cover margin requirements for open futures contracts as of December 31, 2013.
[7]	Cash collateral in the amount of $116,907,700 was pledged to cover margin requirements for open futures contracts as of December 31, 2014.
[8]	Cash collateral in the amount of $107,101,750 was pledged to cover margin requirements for open futures contracts as of December 31, 2013.
[9]	The positions and counterparties herein are as of December 31, 2014. The Funds continually evaluate different counterparties for their transactions and counterparties are subject to change. New counterparties can be added at any time.
[10]	The positions and counterparties herein are as of December 31, 2013. The Funds continually evaluate different counterparties for their transactions and counterparties are subject to change. New counterparties can be added at any time.
[11]	Cash collateral in the amount of $3,821,895 was pledged to cover margin requirements for open futures contracts as of December 31, 2013.
[12]	Cash collateral in the amount of $34,605,120 was pledged to cover margin requirements for open futures contracts as of December 31, 2014.
[13]	Cash collateral in the amount of $6,602,200 was pledged to cover margin requirements for open futures contracts as of December 31, 2013.
[14]	Cash collateral in the amount of $21,134,080 was pledged to cover margin requirements for open futures contracts as of December 31, 2014.
[15]	Cash collateral in the amount of $15,950 was pledged to cover margin requirements for open futures contracts as of December 31, 2013.
[16]	Cash collateral in the amount of $8,800 was pledged to cover margin requirements for open futures contracts as of December 31, 2014.
[17]	Cash collateral in the amount of $22,000 was pledged to cover margin requirements for open futures contracts as of December 31, 2013.
[18]	Cash collateral in the amount of $128,865 was pledged to cover margin requirements for open futures contracts as of December 31, 2013.
[19]	Cash collateral in the amount of $120,131 was pledged to cover margin requirements for open futures contracts as of December 31, 2014.

Schedule_of_Investments_Future1

Schedule of Investments - Futures Contracts Purchased (Parenthetical) (Detail) (Futures Contracts Purchased [Member], USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Cash collateral pledged to cover margin requirements	$18,439,750	$64,020,350
ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Cash collateral pledged to cover margin requirements	1,906,950	8,454,390
ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Cash collateral pledged to cover margin requirements	116,907,700	107,101,750
ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Cash collateral pledged to cover margin requirements	34,605,120	3,821,895
Proshares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Cash collateral pledged to cover margin requirements	21,134,080	6,602,200
ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Cash collateral pledged to cover margin requirements	8,800	15,950
ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Cash collateral pledged to cover margin requirements	14,300	22,000
ProShares Ultra Australian Dollar [Member]
Schedule of Investments [Line Items]
Cash collateral pledged to cover margin requirements	$120,131	$128,865

Schedule_of_Investments_Future2

Schedule of Investments - Futures Contracts Sold (Detail) (USD $)	Dec. 31, 2014		Dec. 31, 2013
ProShares Managed Futures Strategy [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)	$111,707	[1],[2]
ProShares Managed Futures Strategy [Member] | Lean Hogs Futures - CME, Expires February 2015 [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Number of Contracts	6	[1],[2]
Notional Amount at Value	194,880	[1],[2]
Unrealized Appreciation (Depreciation)	7,980	[1],[2]
ProShares Managed Futures Strategy [Member] | NY Harbor USLD Futures - NYMEX, Expires February 2015 [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Number of Contracts	2	[1],[2]
Notional Amount at Value	154,022	[1],[2]
Unrealized Appreciation (Depreciation)	14,704	[1],[2]
ProShares Managed Futures Strategy [Member] | RBOB Gasoline Futures - NYMEX, Expires February 2015 [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Number of Contracts	2	[1],[2]
Notional Amount at Value	123,656	[1],[2]
Unrealized Appreciation (Depreciation)	16,057	[1],[2]
ProShares Managed Futures Strategy [Member] | WTI Crude Oil Mini Futures - NYMEX, Expires February 2015 [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Number of Contracts	4	[1],[2]
Notional Amount at Value	106,472	[1],[2]
Unrealized Appreciation (Depreciation)	19,116	[1],[2]
ProShares Managed Futures Strategy [Member] | Australian Dollar Fx Currency Futures - CME, Expires March 2015 [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Number of Contracts	3	[1],[2]
Notional Amount at Value	243,660	[1],[2]
Unrealized Appreciation (Depreciation)	3,865	[1],[2]
ProShares Managed Futures Strategy [Member] | British Pound Fx Currency Futures - CME, Expires March 2015 [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Number of Contracts	6	[1],[2]
Notional Amount at Value	583,875	[1],[2]
Unrealized Appreciation (Depreciation)	2,540	[1],[2]
ProShares Managed Futures Strategy [Member] | Canadian Dollar Fx Currency Futures - CME, Expires March 2015 [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Number of Contracts	4	[1],[2]
Notional Amount at Value	343,880	[1],[2]
Unrealized Appreciation (Depreciation)	4,190	[1],[2]
ProShares Managed Futures Strategy [Member] | Cocoa Futures - ICE, Expires March 2015 [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Number of Contracts	13	[1],[2]
Notional Amount at Value	378,300	[1],[2]
Unrealized Appreciation (Depreciation)	1,360	[1],[2]
ProShares Managed Futures Strategy [Member] | Copper Futures - COMEX, Expires March 2015 [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Number of Contracts	3	[1],[2]
Notional Amount at Value	211,913	[1],[2]
Unrealized Appreciation (Depreciation)	7,700	[1],[2]
ProShares Managed Futures Strategy [Member] | Copper Mini Futures - COMEX, Expires March 2015 [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Number of Contracts	3	[1],[2]
Notional Amount at Value	105,975	[1],[2]
Unrealized Appreciation (Depreciation)	2,850	[1],[2]
ProShares Managed Futures Strategy [Member] | Cotton No. 2 Futures - ICE, Expires March 2015 [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Number of Contracts	5	[1],[2]
Notional Amount at Value	150,675	[1],[2]
Unrealized Appreciation (Depreciation)	2,272	[1],[2]
ProShares Managed Futures Strategy [Member] | Japanese Yen Fx Currency Futures - CME, Expires March 2015 [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Number of Contracts	3	[1],[2]
Notional Amount at Value	313,088	[1],[2]
Unrealized Appreciation (Depreciation)	2,413	[1],[2]
ProShares Managed Futures Strategy [Member] | Silver Mini Futures - ICE, Expires March 2015 [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Number of Contracts	6	[1],[2]
Notional Amount at Value	93,594	[1],[2]
Unrealized Appreciation (Depreciation)	3,966	[1],[2]
ProShares Managed Futures Strategy [Member] | Swiss Franc Fx Currency Futures - CME, Expires March 2015 [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Number of Contracts	3	[1],[2]
Notional Amount at Value	377,775	[1],[2]
Unrealized Appreciation (Depreciation)	6,000	[1],[2]
ProShares Managed Futures Strategy [Member] | Sugar #11 Futures - ICE, Expires March 2015 [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Number of Contracts	8	[1],[2]
Notional Amount at Value	130,099	[1],[2]
Unrealized Appreciation (Depreciation)	8,095	[1],[2]
ProShares Managed Futures Strategy [Member] | Gold Mini Futures - ICE, Expires February 2015 [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Number of Contracts	4	[1],[2]
Notional Amount at Value	152,275	[1],[2]
Unrealized Appreciation (Depreciation)	1,530	[1],[2]
ProShares Managed Futures Strategy [Member] | Euro Fx Currency Mini Futures - CME, Expires March 2015 [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Number of Contracts	5	[1],[2]
Notional Amount at Value	378,344	[1],[2]
Unrealized Appreciation (Depreciation)	7,069	[1],[2]
ProShares Short VIX Short-Term Futures ETF [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)	-16,352,149	[3]	8,116,955	[4]
ProShares Short VIX Short-Term Futures ETF [Member] | VIX Futures - CBOE, Expires January 2015 [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Number of Contracts	15,388	[3]
Notional Amount at Value	277,368,700	[3]
Unrealized Appreciation (Depreciation)	-701,599	[3]
ProShares Short VIX Short-Term Futures ETF [Member] | VIX Futures - CBOE, Expires February 2015 [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Number of Contracts	12,811	[3]
Notional Amount at Value	233,480,475	[3]
Unrealized Appreciation (Depreciation)	-15,650,550	[3]
ProShares Short VIX Short-Term Futures ETF [Member] | VIX Futures - CBOE, Expires January 2014 [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Number of Contracts			5,867	[4]
Notional Amount at Value			81,844,650	[4]
Unrealized Appreciation (Depreciation)			7,103,655	[4]
ProShares Short VIX Short-Term Futures ETF [Member] | VIX Futures - CBOE, Expires February 2014 [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Number of Contracts			4,061	[4]
Notional Amount at Value			59,899,750	[4]
Unrealized Appreciation (Depreciation)			1,013,300	[4]
ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)	27,018,077	[5]	-2,332,900	[6]
ProShares UltraShort Bloomberg Crude Oil [Member] | Crude Oil - NYMEX, Expires March 2015 [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Number of Contracts	2,569	[7]
Notional Amount at Value	137,955,300	[7]
Unrealized Appreciation (Depreciation)	15,806,603	[7]
ProShares UltraShort Bloomberg Crude Oil [Member] | Crude Oil - NYMEX, Expires March 2014 [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Number of Contracts			2,203	[8]
Notional Amount at Value			217,105,650	[8]
Unrealized Appreciation (Depreciation)			-1,232,773	[8]
Proshares UltraShort Bloomberg Natural Gas [Member] | Natural Gas - NYMEX, Expires March 2015 [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Number of Contracts	1,014
Notional Amount at Value	29,365,440
Unrealized Appreciation (Depreciation)	3,941,465
Proshares UltraShort Bloomberg Natural Gas [Member] | Natural Gas - NYMEX, Expires March 2014 [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Number of Contracts			1,084	[9]
Notional Amount at Value			45,452,120	[9]
Unrealized Appreciation (Depreciation)			1,042,300	[9]
ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)	-2,282,778	[5]	5,633,053	[6]
ProShares UltraShort Gold [Member] | Gold Futures - COMEX, Expires February 2015 [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Number of Contracts	2	[10]
Notional Amount at Value	236,820	[10]
Unrealized Appreciation (Depreciation)	-4,520	[10]
ProShares UltraShort Gold [Member] | Gold Futures - COMEX, Expires February 2014 [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Number of Contracts			2	[11]
Notional Amount at Value			240,460	[11]
Unrealized Appreciation (Depreciation)			14,520	[11]
ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)	594,953	[5]	-2,227,857	[6]
ProShares UltraShort Silver [Member] | Silver Futures - COMEX, Expires March 2015 [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Number of Contracts	2	[12]
Notional Amount at Value	155,990	[12]
Unrealized Appreciation (Depreciation)	1,560	[12]
ProShares UltraShort Silver [Member] | Silver Futures - COMEX, Expires March 2014 [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Number of Contracts			2	[13]
Notional Amount at Value			193,700	[13]
Unrealized Appreciation (Depreciation)			14,200	[13]
ProShares Short Euro [Member] | Euro Fx Currency Futures - CME, Expires March 2014 [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Number of Contracts			52	[14]
Notional Amount at Value			8,962,200	[14]
Unrealized Appreciation (Depreciation)			-33,231	[14]
ProShares Short Euro [Member] | Euro Fx Currency Futures - CME, Expires March 2015 [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Number of Contracts	92	[15]
Notional Amount at Value	13,923,050	[15]
Unrealized Appreciation (Depreciation)	385,331	[15]
ProShares UltraShort Australian Dollar [Member] | Australian Dollar Fx Currency Futures - CME, Expires March 2015 [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Number of Contracts	569	[16]
Notional Amount at Value	46,214,180	[16]
Unrealized Appreciation (Depreciation)	743,481	[16]
ProShares UltraShort Australian Dollar [Member] | Australian Dollar Fx Currency Futures - CME, Expires March 2014 [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Number of Contracts			629	[17]
Notional Amount at Value			55,867,780	[17]
Unrealized Appreciation (Depreciation)			$917,605	[17]
[1]	Cash collateral in the amount of $195,142 was pledged to cover margin requirements for open futures contracts as of December 31, 2014.
[2]	Since the Fund commenced investment operations on October 1, 2014, the Schedule of Investments as of December 31, 2013 has not been provided.
[3]	Cash collateral in the amount of $85,244,950 was pledged to cover margin requirements for open futures contracts as of December 31, 2014.
[4]	Cash collateral in the amount of $33,552,650 was pledged to cover margin requirements for open futures contracts as of December 31, 2013.
[5]	The positions and counterparties herein are as of December 31, 2014. The Funds continually evaluate different counterparties for their transactions and counterparties are subject to change. New counterparties can be added at any time.
[6]	The positions and counterparties herein are as of December 31, 2013. The Funds continually evaluate different counterparties for their transactions and counterparties are subject to change. New counterparties can be added at any time.
[7]	Cash collateral in the amount of $12,292,665 was pledged to cover margin requirements for open futures contracts as of December 31, 2014.
[8]	Cash collateral in the amount of $7,633,395 was pledged to cover margin requirements for open futures contracts as of December 31, 2013.
[9]	Cash collateral in the amount of $2,384,800 was pledged to cover margin requirements for open futures contracts as of December 31, 2013.
[10]	Cash collateral in the amount of $8,800 was pledged to cover margin requirements for open futures contracts as of December 31, 2014.
[11]	Cash collateral in the amount of $15,950 was pledged to cover margin requirements for open futures contracts as of December 31, 2013.
[12]	Cash collateral in the amount of $14,300 was pledged to cover margin requirements for open futures contracts as of December 31, 2014.
[13]	Cash collateral in the amount of $22,000 was pledged to cover margin requirements for open futures contracts as of December 31, 2013.
[14]	Cash collateral in the amount of $128,700 was pledged to cover margin requirements for open futures contracts as of December 31, 2013.
[15]	Cash collateral in the amount of $242,880 was pledged to cover margin requirements for open futures contracts as of December 31, 2014.
[16]	Cash collateral in the amount of $1,020,217 was pledged to cover margin requirements for open futures contracts as of December 31, 2014.
[17]	Cash collateral in the amount of $1,141,635 was pledged to cover margin requirements for open futures contracts as of December 31, 2013.

Schedule_of_Investments_Future3

Schedule of Investments - Futures Contracts Sold (Parenthetical) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
ProShares Managed Futures Strategy [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Cash collateral pledged to cover margin requirements	$195,142
ProShares Short VIX Short-Term Futures ETF [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Cash collateral pledged to cover margin requirements	85,244,950	33,552,650
ProShares UltraShort Bloomberg Crude Oil [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Cash collateral pledged to cover margin requirements	12,292,665	7,633,395
Proshares UltraShort Bloomberg Natural Gas [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Cash collateral pledged to cover margin requirements	4,405,830	2,384,800
ProShares UltraShort Gold [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Cash collateral pledged to cover margin requirements	8,800	15,950
ProShares UltraShort Silver [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Cash collateral pledged to cover margin requirements	14,300	22,000
ProShares Short Euro [Member]
Schedule of Investments [Line Items]
Cash collateral pledged to cover margin requirements	242,880
ProShares Short Euro [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Cash collateral pledged to cover margin requirements		128,700
ProShares UltraShort Australian Dollar [Member] | Futures Contracts Sold [Member]
Schedule of Investments [Line Items]
Cash collateral pledged to cover margin requirements	$1,020,217	$1,141,635

Schedule_of_Investments_ShortT

Schedule of Investments - Short-Term U.S. Government and Agency Obligations (Detail) (USD $)	Dec. 31, 2014		Dec. 31, 2013
ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Total short-term U.S. government and Value	$131,594,608		$247,584,623
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.022% Due 02/06/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			53,403,000	[1]
Total short-term U.S. government and Value			53,402,221	[1]
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.052% Due 03/06/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			14,666,000	[1]
Total short-term U.S. government and Value			14,664,717	[1]
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.057% Due 03/13/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			2,963,000
Total short-term U.S. government and Value			2,962,769
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.042% Due 03/20/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			19,889,000	[1]
Total short-term U.S. government and Value			19,886,448	[1]
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.075% Due 04/03/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			4,678,000
Total short-term U.S. government and Value			4,677,172
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.061% Due 04/10/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			28,254,000	[1]
Total short-term U.S. government and Value			28,250,539	[1]
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.080% Due 04/17/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			60,345,000	[1]
Total short-term U.S. government and Value			60,338,840	[1]
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.093% Due 04/24/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			2,000,000	[1]
Total short-term U.S. government and Value			1,999,627	[1]
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.080% Due 05/01/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			6,659,000	[1]
Total short-term U.S. government and Value			6,657,899	[1]
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.088% Due 05/08/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			2,477,000	[1]
Total short-term U.S. government and Value			2,476,523	[1]
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.061% Due 05/22/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			41,947,000	[1]
Total short-term U.S. government and Value			41,937,212	[1]
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.076% Due 06/05/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			5,200,000	[1]
Total short-term U.S. government and Value			5,198,777	[1]
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.079% Due 06/26/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			5,134,000
Total short-term U.S. government and Value			5,131,879
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.051% Due 01/08/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	7,520,000
Total short-term U.S. government and Value	7,519,981
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.010% Due 01/22/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	8,188,000
Total short-term U.S. government and Value	8,187,864
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.014% Due 02/12/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	4,424,000	[1]
Total short-term U.S. government and Value	4,423,899	[1]
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.024% Due 02/19/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	3,423,000	[1]
Total short-term U.S. government and Value	3,422,909	[1]
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.023% Due 03/05/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	8,064,000	[1]
Total short-term U.S. government and Value	8,063,792	[1]
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.021% Due 03/12/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	7,534,000	[1]
Total short-term U.S. government and Value	7,533,711	[1]
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.041% Due 04/16/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	8,635,000	[1]
Total short-term U.S. government and Value	8,634,376	[1]
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.044% Due 04/30/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	27,059,000	[1]
Total short-term U.S. government and Value	27,055,452	[1]
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.064% Due 05/14/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	25,974,000
Total short-term U.S. government and Value	25,969,714
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.061% Due 05/21/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	3,842,000
Total short-term U.S. government and Value	3,841,258
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.073% Due 05/28/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	2,920,000	[1]
Total short-term U.S. government and Value	2,919,290	[1]
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.072% Due 06/04/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	21,246,000	[1]
Total short-term U.S. government and Value	21,239,228	[1]
ProShares UltraShort Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.030% Due 06/11/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	2,784,000
Total short-term U.S. government and Value	2,783,134
Proshares UltraShort Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Total short-term U.S. government and Value	8,672,710		18,274,713
Proshares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.049% Due 02/06/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			146,000
Total short-term U.S. government and Value			145,998
Proshares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.051% Due 03/06/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			731,000
Total short-term U.S. government and Value			730,936
Proshares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.056% Due 03/13/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			1,392,000
Total short-term U.S. government and Value			1,391,892
Proshares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.034% Due 03/20/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			905,000
Total short-term U.S. government and Value			904,884
Proshares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.059% Due 04/10/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			675,000
Total short-term U.S. government and Value			674,917
Proshares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.075% Due 04/17/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			522,000
Total short-term U.S. government and Value			521,947
Proshares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.081% Due 05/01/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			2,245,000
Total short-term U.S. government and Value			2,244,629
Proshares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.068% Due 05/08/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			3,322,000
Total short-term U.S. government and Value			3,321,361
Proshares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.065% Due 06/12/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			1,761,000
Total short-term U.S. government and Value			1,760,606
Proshares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.064% Due 06/19/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			6,580,000
Total short-term U.S. government and Value			6,577,543
Proshares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.041% Due 04/16/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	1,190,000
Total short-term U.S. government and Value	1,189,914
Proshares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.010% Due 02/12/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	129,000
Total short-term U.S. government and Value	128,997
Proshares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.021% Due 02/19/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	717,000
Total short-term U.S. government and Value	716,981
Proshares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.056% Due 04/30/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	790,000
Total short-term U.S. government and Value	789,897
Proshares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.061% Due 05/14/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	3,398,000
Total short-term U.S. government and Value	3,397,439
Proshares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.035% Due 05/21/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	2,093,000
Total short-term U.S. government and Value	2,092,596
Proshares UltraShort Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.073% Due 06/04/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	357,000
Total short-term U.S. government and Value	356,886
ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Total short-term U.S. government and Value	84,040,107		148,988,329
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.088% Due 05/08/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			14,693,000	[2]
Total short-term U.S. government and Value			14,690,172	[2]
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.076% Due 06/05/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			4,617,000	[2]
Total short-term U.S. government and Value			4,615,914	[2]
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.017% Due 02/06/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			6,963,000	[2]
Total short-term U.S. government and Value			6,962,898	[2]
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.050% Due 03/06/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			39,266,000
Total short-term U.S. government and Value			39,262,564
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.027% Due 03/20/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			49,626,000	[2]
Total short-term U.S. government and Value			49,619,632	[2]
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.071% Due 04/03/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			22,053,000
Total short-term U.S. government and Value			22,049,098
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.087% Due 05/01/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			11,790,000	[2]
Total short-term U.S. government and Value			11,788,051	[2]
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.051% Due 01/08/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	995,000	[2]
Total short-term U.S. government and Value	994,998	[2]
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.023% Due 03/05/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	4,814,000	[2]
Total short-term U.S. government and Value	4,813,876	[2]
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.041% Due 04/16/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	2,572,000	[2]
Total short-term U.S. government and Value	2,571,814	[2]
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.061% Due 05/21/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	2,641,000	[2]
Total short-term U.S. government and Value	2,640,490	[2]
ProShares UltraShort Gold [Member] | Us Treasury Bills 0.007% Due 01/22/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	5,194,000
Total short-term U.S. government and Value	5,193,913
ProShares UltraShort Gold [Member] | Us Treasury Bills 0.021% Due 02/12/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	7,310,000	[2]
Total short-term U.S. government and Value	7,309,833	[2]
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.017% Due 02/19/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	24,106,000	[2]
Total short-term U.S. government and Value	24,105,357	[2]
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.015% Due 03/12/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	4,878,000
Total short-term U.S. government and Value	4,877,813
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.042% Due 04/30/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	6,386,000	[2]
Total short-term U.S. government and Value	6,385,163	[2]
ProShares UltraShort Gold [Member] | U.S. Treasury Bills 0.056% Due 05/14/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	25,151,000
Total short-term U.S. government and Value	25,146,850
ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Total short-term U.S. government and Value	52,226,692		114,826,066
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.051% Due 03/06/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			26,555,000	[2]
Total short-term U.S. government and Value			26,552,676	[2]
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.075% Due 04/17/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			8,507,000	[2]
Total short-term U.S. government and Value			8,506,132	[2]
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.081% Due 05/01/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			25,666,000	[2]
Total short-term U.S. government and Value			25,661,758	[2]
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.017% Due 02/06/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			14,500,000
Total short-term U.S. government and Value			14,499,789
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.100% Due 02/13/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			3,997,000
Total short-term U.S. government and Value			3,996,953
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.025% Due 03/13/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			4,084,000	[2]
Total short-term U.S. government and Value			4,083,682	[2]
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.047% Due 03/20/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			23,168,000	[2]
Total short-term U.S. government and Value			23,165,027	[2]
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.057% Due 05/22/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			8,362,000	[2]
Total short-term U.S. government and Value			8,360,049	[2]
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.051% Due 01/08/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	992,000	[2]
Total short-term U.S. government and Value	991,997	[2]
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.061% Due 05/21/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	2,355,000
Total short-term U.S. government and Value	2,354,545
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.056% Due 05/14/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	1,504,000	[2]
Total short-term U.S. government and Value	1,503,752	[2]
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.020% Due 02/12/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	6,632,000	[2]
Total short-term U.S. government and Value	6,631,849	[2]
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.014% Due 02/19/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	5,857,000	[2]
Total short-term U.S. government and Value	5,856,844	[2]
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.030% Due 03/12/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	12,806,000	[2]
Total short-term U.S. government and Value	12,805,509	[2]
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.051% Due 04/30/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	11,917,000	[2]
Total short-term U.S. government and Value	11,915,438	[2]
ProShares UltraShort Silver [Member] | U.S. Treasury Bills 0.078% Due 06/04/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	10,170,000	[2]
Total short-term U.S. government and Value	10,166,758	[2]
ProShares Short Euro [Member]
Schedule of Investments [Line Items]
Total short-term U.S. government and Value	12,086,577		7,902,056
ProShares Short Euro [Member] | U.S. Treasury Bills 0.057% Due 03/13/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			110,000
Total short-term U.S. government and Value			109,991
ProShares Short Euro [Member] | U.S. Treasury Bills 0.037% Due 02/06/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			357,000
Total short-term U.S. government and Value			356,995
ProShares Short Euro [Member] | U.S. Treasury Bills 0.053% Due 02/27/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			2,859,000
Total short-term U.S. government and Value			2,858,889
ProShares Short Euro [Member] | U.S. Treasury Bills 0.053% Due 03/06/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			1,505,000
Total short-term U.S. government and Value			1,504,868
ProShares Short Euro [Member] | U.S. Treasury Bills 0.086% Due 06/12/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			3,072,000
Total short-term U.S. government and Value			3,071,313
ProShares Short Euro [Member] | U.S. Treasury Bills 0.024% Due 02/19/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	4,903,000
Total short-term U.S. government and Value	4,902,869
ProShares Short Euro [Member] | U.S. Treasury Bills 0.041% Due 04/16/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	2,278,000
Total short-term U.S. government and Value	2,277,836
ProShares Short Euro [Member] | U.S. Treasury Bills 0.078% Due 06/04/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	2,809,000
Total short-term U.S. government and Value	2,808,105
ProShares Short Euro [Member] | U.S. Treasury Bills 0.013% Due 02/12/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	390,000
Total short-term U.S. government and Value	389,991
ProShares Short Euro [Member] | U.S. Treasury Bills 0.040% Due 04/30/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	1,708,000
Total short-term U.S. government and Value	1,707,776
ProShares UltraShort Australian Dollar [Member]
Schedule of Investments [Line Items]
Total short-term U.S. government and Value	20,267,679		24,198,507
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 0.088% Due 05/08/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			2,324,000
Total short-term U.S. government and Value			2,323,553
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 0.065% Due 06/12/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			147,000
Total short-term U.S. government and Value			146,967
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 0.032% Due 02/06/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			1,761,000
Total short-term U.S. government and Value			1,760,974
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 0.061% Due 03/13/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			1,872,000
Total short-term U.S. government and Value			1,871,854
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 0.073% Due 04/03/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			659,000
Total short-term U.S. government and Value			658,883
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 0.066% Due 04/17/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			1,269,000
Total short-term U.S. government and Value			1,268,871
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 0.085% Due 04/24/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			651,000
Total short-term U.S. government and Value			650,879
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 0.076% Due 05/01/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			2,167,000
Total short-term U.S. government and Value			2,166,642
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 0.073% Due 05/22/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			13,353,000
Total short-term U.S. government and Value			13,349,884
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 0.010% Due 02/12/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	735,000
Total short-term U.S. government and Value	734,983
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 0.056% Due 04/30/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	351,000
Total short-term U.S. government and Value	350,954
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 0.035% Due 05/21/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	854,000
Total short-term U.S. government and Value	853,835
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 0.012% Due 02/19/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	15,300,000
Total short-term U.S. government and Value	15,299,592
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 0.021% Due 03/05/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	267,000
Total short-term U.S. government and Value	266,993
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 0.043% Due 04/16/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	756,000
Total short-term U.S. government and Value	755,946
ProShares UltraShort Australian Dollar [Member] | U.S. Treasury Bills 0.087% Due 06/11/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	2,006,000
Total short-term U.S. government and Value	2,005,376
ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Total short-term U.S. government and Value	487,111,117		437,847,159
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.081% Due 05/01/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			59,285,000	[3]
Total short-term U.S. government and Value			59,275,202	[3]
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.053% Due 02/27/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			198,499,000	[3]
Total short-term U.S. government and Value			198,491,280	[3]
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.086% Due 06/12/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			8,036,000	[3]
Total short-term U.S. government and Value			8,034,203	[3]
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.014% Due 02/06/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			32,976,000	[3]
Total short-term U.S. government and Value			32,975,519	[3]
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.070% Due 04/03/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			47,020,000
Total short-term U.S. government and Value			47,011,680
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.083% Due 05/08/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			92,077,000	[3]
Total short-term U.S. government and Value			92,059,275	[3]
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.041% Due 04/16/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	2,717,000	[4]
Total short-term U.S. government and Value	2,716,804	[4]
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.061% Due 05/21/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	67,461,000
Total short-term U.S. government and Value	67,447,976
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.015% Due 03/12/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	12,133,000
Total short-term U.S. government and Value	12,132,535
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.011% Due 01/22/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	37,647,000	[4]
Total short-term U.S. government and Value	37,646,372	[4]
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.022% Due 02/12/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	8,135,000
Total short-term U.S. government and Value	8,134,815
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.010% Due 02/19/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	69,601,000	[4]
Total short-term U.S. government and Value	69,599,144	[4]
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.027% Due 03/05/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	58,406,000	[4]
Total short-term U.S. government and Value	58,404,491	[4]
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.048% Due 04/30/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	57,015,000	[4]
Total short-term U.S. government and Value	57,007,525	[4]
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.070% Due 05/28/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	6,919,000
Total short-term U.S. government and Value	6,917,316
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.082% Due 06/04/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	112,157,000	[4]
Total short-term U.S. government and Value	112,121,250	[4]
ProShares UltraShort Euro [Member] | U.S. Treasury Bills 0.090% Due 06/11/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	55,000,000	[4]
Total short-term U.S. government and Value	54,982,889	[4]
ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Total short-term U.S. government and Value	532,957,746		558,597,264
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.052% Due 03/06/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			50,872,000
Total short-term U.S. government and Value			50,867,548
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.076% Due 06/05/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			100,035,000
Total short-term U.S. government and Value			100,011,464
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.086% Due 06/12/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			100,037,000	[3]
Total short-term U.S. government and Value			100,014,631	[3]
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.021% Due 02/06/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			15,473,000	[3]
Total short-term U.S. government and Value			15,472,774	[3]
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.011% Due 03/20/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			83,948,000	[3]
Total short-term U.S. government and Value			83,937,227	[3]
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.087% Due 04/17/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			31,984,000	[3]
Total short-term U.S. government and Value			31,980,735	[3]
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.093% Due 05/01/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			20,349,000	[3]
Total short-term U.S. government and Value			20,345,637	[3]
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.086% Due 05/08/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			19,927,000	[3]
Total short-term U.S. government and Value			19,923,164	[3]
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.078% Due 05/22/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			101,809,000
Total short-term U.S. government and Value			101,785,245
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.085% Due 06/26/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			34,273,000
Total short-term U.S. government and Value			34,258,839
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.041% Due 04/16/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	81,110,000	[4]
Total short-term U.S. government and Value	81,104,142	[4]
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.056% Due 04/30/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	22,696,000	[4]
Total short-term U.S. government and Value	22,693,024	[4]
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.087% Due 06/11/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	49,440,000	[4]
Total short-term U.S. government and Value	49,424,619	[4]
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.017% Due 01/29/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	32,686,000
Total short-term U.S. government and Value	32,685,510
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.019% Due 02/12/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	92,533,000	[4]
Total short-term U.S. government and Value	92,530,892	[4]
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.027% Due 02/19/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	19,439,000	[4]
Total short-term U.S. government and Value	19,438,482	[4]
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.026% Due 03/05/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	164,216,000	[4]
Total short-term U.S. government and Value	164,211,758	[4]
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.014% Due 03/12/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	51,533,000
Total short-term U.S. government and Value	51,531,025
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.063% Due 05/14/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	1,002,000
Total short-term U.S. government and Value	1,001,835
ProShares UltraShort Yen [Member] | U.S. Treasury Bills 0.070% Due 05/21/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	18,340,000
Total short-term U.S. government and Value	18,336,459
ProShares Ultra Bloomberg Commodity [Member]
Schedule of Investments [Line Items]
Total short-term U.S. government and Value	2,754,900		2,816,688
ProShares Ultra Bloomberg Commodity [Member] | U.S. Treasury Bills 0.076% Due 06/05/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			805,000
Total short-term U.S. government and Value			804,811
ProShares Ultra Bloomberg Commodity [Member] | U.S. Treasury Bills 0.081% Due 05/01/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			192,000	[1]
Total short-term U.S. government and Value			191,968	[1]
ProShares Ultra Bloomberg Commodity [Member] | U.S. Treasury Bills 0.053% Due 02/27/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			226,000
Total short-term U.S. government and Value			225,991
ProShares Ultra Bloomberg Commodity [Member] | U.S. Treasury Bills 0.011% Due 03/20/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			517,000	[1]
Total short-term U.S. government and Value			516,934	[1]
ProShares Ultra Bloomberg Commodity [Member] | U.S. Treasury Bills 0.026% Due 02/06/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			1,077,000	[1]
Total short-term U.S. government and Value			1,076,984	[1]
ProShares Ultra Bloomberg Commodity [Member] | U.S. Treasury Bills 0.051% Due 01/08/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	984,000	[1]
Total short-term U.S. government and Value	983,997	[1]
ProShares Ultra Bloomberg Commodity [Member] | U.S. Treasury Bills 0.019% Due 02/19/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	1,288,000	[1]
Total short-term U.S. government and Value	1,287,966	[1]
ProShares Ultra Bloomberg Commodity [Member] | U.S. Treasury Bills 0.047% Due 04/30/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	483,000
Total short-term U.S. government and Value	482,937
ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Total short-term U.S. government and Value	467,200,736		137,435,610
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.042% Due 03/20/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			500,000
Total short-term U.S. government and Value			499,936
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.076% Due 06/05/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			424,000
Total short-term U.S. government and Value			423,900
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.065% Due 06/12/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			1,081,000	[1]
Total short-term U.S. government and Value			1,080,758	[1]
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.100% Due 02/13/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			7,335,000	[1]
Total short-term U.S. government and Value			7,334,915	[1]
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.073% Due 04/03/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			2,188,000
Total short-term U.S. government and Value			2,187,613
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.085% Due 04/24/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			1,277,000
Total short-term U.S. government and Value			1,276,762
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.086% Due 05/08/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			10,806,000	[1]
Total short-term U.S. government and Value			10,803,920	[1]
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.016% Due 02/06/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			13,712,000	[1]
Total short-term U.S. government and Value			13,711,800	[1]
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.043% Due 03/06/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			11,796,000
Total short-term U.S. government and Value			11,794,968
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.054% Due 03/13/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			1,270,000
Total short-term U.S. government and Value			1,269,901
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.077% Due 04/10/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			6,830,000
Total short-term U.S. government and Value			6,829,163
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.077% Due 04/17/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			69,787,000	[1]
Total short-term U.S. government and Value			69,779,876	[1]
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.083% Due 05/01/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			7,864,000	[1]
Total short-term U.S. government and Value			7,862,700	[1]
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.071% Due 05/22/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			2,580,000
Total short-term U.S. government and Value			2,579,398
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.020% Due 03/05/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	85,597,000	[1]
Total short-term U.S. government and Value	85,594,789	[1]
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.051% Due 01/08/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	14,590,000
Total short-term U.S. government and Value	14,589,964
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.030% Due 06/11/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	2,595,000
Total short-term U.S. government and Value	2,594,193
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.061% Due 05/14/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	15,454,000	[1]
Total short-term U.S. government and Value	15,451,450	[1]
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.017% Due 02/19/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	19,325,000
Total short-term U.S. government and Value	19,324,485
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.014% Due 03/12/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	50,156,000
Total short-term U.S. government and Value	50,154,077
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.015% Due 01/22/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	20,210,000
Total short-term U.S. government and Value	20,209,663
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.009% Due 01/29/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	13,133,000
Total short-term U.S. government and Value	13,132,803
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.039% Due 04/16/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	23,346,000	[1]
Total short-term U.S. government and Value	23,344,314	[1]
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.049% Due 04/30/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	50,260,000	[1]
Total short-term U.S. government and Value	50,253,410	[1]
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.051% Due 05/21/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	60,018,000	[1]
Total short-term U.S. government and Value	60,006,413	[1]
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.071% Due 05/28/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	40,567,000	[1]
Total short-term U.S. government and Value	40,557,129	[1]
ProShares Ultra Bloomberg Crude Oil [Member] | U.S. Treasury Bills 0.074% Due 06/04/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	72,011,000	[1]
Total short-term U.S. government and Value	71,988,046	[1]
Proshares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Total short-term U.S. government and Value	53,410,227		58,921,011
Proshares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.042% Due 03/20/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			2,792,000
Total short-term U.S. government and Value			2,791,642
Proshares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.080% Due 04/17/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			43,000
Total short-term U.S. government and Value			42,996
Proshares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.076% Due 06/05/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			10,791,000
Total short-term U.S. government and Value			10,788,461
Proshares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.100% Due 02/13/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			3,925,000
Total short-term U.S. government and Value			3,924,954
Proshares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.053% Due 03/06/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			1,197,000
Total short-term U.S. government and Value			1,196,895
Proshares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.015% Due 02/06/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			371,000
Total short-term U.S. government and Value			370,995
Proshares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.055% Due 03/13/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			6,686,000
Total short-term U.S. government and Value			6,685,480
Proshares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.055% Due 04/03/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			5,086,000
Total short-term U.S. government and Value			5,085,100
Proshares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.060% Due 04/10/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			8,844,000
Total short-term U.S. government and Value			8,842,917
Proshares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.082% Due 04/24/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			4,789,000
Total short-term U.S. government and Value			4,788,106
Proshares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.092% Due 05/01/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			3,500,000
Total short-term U.S. government and Value			3,499,421
Proshares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.091% Due 05/08/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			2,534,000
Total short-term U.S. government and Value			2,533,512
Proshares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.064% Due 05/22/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			5,515,000
Total short-term U.S. government and Value			5,513,713
Proshares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.082% Due 06/26/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			2,858,000
Total short-term U.S. government and Value			2,856,819
Proshares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.051% Due 01/08/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	3,173,000
Total short-term U.S. government and Value	3,172,992
Proshares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.061% Due 05/14/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	10,840,000
Total short-term U.S. government and Value	10,838,211
Proshares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.015% Due 03/12/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	2,011,000
Total short-term U.S. government and Value	2,010,923
Proshares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.008% Due 01/22/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	2,973,000
Total short-term U.S. government and Value	2,972,950
Proshares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.010% Due 01/29/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	1,773,000
Total short-term U.S. government and Value	1,772,973
Proshares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.018% Due 02/12/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	2,356,000
Total short-term U.S. government and Value	2,355,946
Proshares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.024% Due 03/05/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	3,145,000
Total short-term U.S. government and Value	3,144,919
Proshares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.037% Due 04/16/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	3,175,000
Total short-term U.S. government and Value	3,174,771
Proshares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.054% Due 04/30/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	9,743,000
Total short-term U.S. government and Value	9,741,723
Proshares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.056% Due 05/21/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	5,588,000
Total short-term U.S. government and Value	5,586,921
Proshares Ultra Bloomberg Natural Gas [Member] | U.S. Treasury Bills 0.060% Due 05/28/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	8,640,000
Total short-term U.S. government and Value	8,637,898
ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Total short-term U.S. government and Value	101,927,857		140,880,950
ProShares Ultra Gold [Member] | U.S. Treasury Bills 0.080% Due 04/17/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			10,244,000	[2]
Total short-term U.S. government and Value			10,242,954	[2]
ProShares Ultra Gold [Member] | U.S. Treasury Bills 0.051% Due 03/06/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			23,937,000	[2]
Total short-term U.S. government and Value			23,934,906	[2]
ProShares Ultra Gold [Member] | U.S. Treasury Bills 0.017% Due 02/06/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			39,093,000	[2]
Total short-term U.S. government and Value			39,092,430	[2]
ProShares Ultra Gold [Member] | U.S. Treasury Bills 0.086% Due 06/12/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			446,000
Total short-term U.S. government and Value			445,900
ProShares Ultra Gold [Member] | U.S. Treasury Bills 0.011% Due 03/20/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			51,752,000	[2]
Total short-term U.S. government and Value			51,745,359	[2]
ProShares Ultra Gold [Member] | U.S. Treasury Bills 0.070% Due 05/22/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			15,423,000	[2]
Total short-term U.S. government and Value			15,419,401	[2]
ProShares Ultra Gold [Member] | U.S. Treasury Bills 0.051% Due 01/08/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	13,004,000	[2]
Total short-term U.S. government and Value	13,003,967	[2]
ProShares Ultra Gold [Member] | U.S. Treasury Bills 0.061% Due 05/21/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	3,373,000
Total short-term U.S. government and Value	3,372,349
ProShares Ultra Gold [Member] | U.S. Treasury Bills 0.078% Due 06/04/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	16,428,000	[2]
Total short-term U.S. government and Value	16,422,764	[2]
ProShares Ultra Gold [Member] | U.S. Treasury Bills 0.010% Due 02/19/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	17,175,000	[2]
Total short-term U.S. government and Value	17,174,542	[2]
ProShares Ultra Gold [Member] | U.S. Treasury Bills 0.010% Due 01/29/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	2,843,000	[2]
Total short-term U.S. government and Value	2,842,957	[2]
ProShares Ultra Gold [Member] | U.S. Treasury Bills 0.045% Due 04/30/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	11,287,000	[2]
Total short-term U.S. government and Value	11,285,520	[2]
ProShares Ultra Gold [Member] | U.S. Treasury Bills 0.057% Due 05/14/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	37,832,000	[2]
Total short-term U.S. government and Value	37,825,758	[2]
ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Total short-term U.S. government and Value	305,474,211		467,868,976
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.042% Due 03/20/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			1,793,000	[2]
Total short-term U.S. government and Value			1,792,770	[2]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.080% Due 04/17/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			137,765,000	[2]
Total short-term U.S. government and Value			137,750,937	[2]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.093% Due 04/24/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			2,451,000	[2]
Total short-term U.S. government and Value			2,450,542	[2]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.088% Due 05/08/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			5,908,000	[2]
Total short-term U.S. government and Value			5,906,863	[2]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.070% Due 04/03/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			14,766,000
Total short-term U.S. government and Value			14,763,387
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.093% Due 05/01/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			2,934,000
Total short-term U.S. government and Value			2,933,515
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.010% Due 02/06/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			246,229,000	[2]
Total short-term U.S. government and Value			246,225,410	[2]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.047% Due 03/06/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			26,139,000	[2]
Total short-term U.S. government and Value			26,136,713	[2]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.066% Due 04/10/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			7,392,000	[2]
Total short-term U.S. government and Value			7,391,094	[2]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.069% Due 05/22/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			22,523,000	[2]
Total short-term U.S. government and Value			22,517,745	[2]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.041% Due 04/16/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	18,037,000	[2]
Total short-term U.S. government and Value	18,035,697	[2]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.078% Due 06/04/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	4,277,000	[2]
Total short-term U.S. government and Value	4,275,637	[2]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.090% Due 06/11/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	45,017,000	[2]
Total short-term U.S. government and Value	45,002,995	[2]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.047% Due 04/30/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	6,604,000	[2]
Total short-term U.S. government and Value	6,603,134	[2]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.016% Due 01/22/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	2,309,000
Total short-term U.S. government and Value	2,308,961
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.012% Due 01/29/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	14,382,000
Total short-term U.S. government and Value	14,381,784
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.011% Due 02/12/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	92,778,000	[2]
Total short-term U.S. government and Value	92,775,887	[2]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.020% Due 02/19/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	35,850,000	[2]
Total short-term U.S. government and Value	35,849,044	[2]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.012% Due 03/05/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	9,368,000	[2]
Total short-term U.S. government and Value	9,367,758	[2]
ProShares Ultra Silver [Member] | U.S. Treasury Bills 0.060% Due 05/14/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	76,886,000	[2]
Total short-term U.S. government and Value	76,873,314	[2]
ProShares Ultra Australian Dollar [Member]
Schedule of Investments [Line Items]
Total short-term U.S. government and Value	2,405,685		2,716,439
ProShares Ultra Australian Dollar [Member] | U.S. Treasury Bills 0.053% Due 02/27/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			105,000
Total short-term U.S. government and Value			104,996
ProShares Ultra Australian Dollar [Member] | U.S. Treasury Bills 0.086% Due 06/12/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			2,448,000
Total short-term U.S. government and Value			2,447,453
ProShares Ultra Australian Dollar [Member] | U.S. Treasury Bills 0.016% Due 02/06/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			78,000
Total short-term U.S. government and Value			77,999
ProShares Ultra Australian Dollar [Member] | U.S. Treasury Bills 0.065% Due 04/17/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			86,000
Total short-term U.S. government and Value			85,991
ProShares Ultra Australian Dollar [Member] | U.S. Treasury Bills 0.040% Due 04/30/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	2,406,000
Total short-term U.S. government and Value	2,405,685
ProShares Ultra Euro [Member]
Schedule of Investments [Line Items]
Total short-term U.S. government and Value	2,415,698		2,455,863
ProShares Ultra Euro [Member] | U.S. Treasury Bills 0.076% Due 06/05/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			315,000
Total short-term U.S. government and Value			314,926
ProShares Ultra Euro [Member] | U.S. Treasury Bills 0.100% Due 02/13/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			1,236,000
Total short-term U.S. government and Value			1,235,985
ProShares Ultra Euro [Member] | U.S. Treasury Bills 0.053% Due 02/27/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			115,000
Total short-term U.S. government and Value			114,995
ProShares Ultra Euro [Member] | U.S. Treasury Bills 0.011% Due 02/06/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			431,000	[3]
Total short-term U.S. government and Value			430,994	[3]
ProShares Ultra Euro [Member] | U.S. Treasury Bills 0.021% Due 03/06/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			208,000	[3]
Total short-term U.S. government and Value			207,982	[3]
ProShares Ultra Euro [Member] | U.S. Treasury Bills 0.040% Due 03/20/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			151,000
Total short-term U.S. government and Value			150,981
ProShares Ultra Euro [Member] | U.S. Treasury Bills 0.010% Due 02/12/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	245,000
Total short-term U.S. government and Value	244,994
ProShares Ultra Euro [Member] | U.S. Treasury Bills 0.035% Due 05/21/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	1,000,000
Total short-term U.S. government and Value	999,807
ProShares Ultra Euro [Member] | U.S. Treasury Bills 0.021% Due 03/05/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	342,000	[4]
Total short-term U.S. government and Value	341,991	[4]
ProShares Ultra Euro [Member] | U.S. Treasury Bills 0.047% Due 04/30/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	587,000	[4]
Total short-term U.S. government and Value	586,923	[4]
ProShares Ultra Euro [Member] | U.S. Treasury Bills 0.036% Due 04/16/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	242,000
Total short-term U.S. government and Value	241,983
ProShares Ultra Yen [Member]
Schedule of Investments [Line Items]
Total short-term U.S. government and Value	1,287,869		2,928,556
ProShares Ultra Yen [Member] | U.S. Treasury Bills 0.053% Due 02/27/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			117,000
Total short-term U.S. government and Value			116,996
ProShares Ultra Yen [Member] | U.S. Treasury Bills 0.086% Due 06/12/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			1,855,000
Total short-term U.S. government and Value			1,854,585
ProShares Ultra Yen [Member] | U.S. Treasury Bills 0.021% Due 03/06/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			144,000	[3]
Total short-term U.S. government and Value			143,987	[3]
ProShares Ultra Yen [Member] | U.S. Treasury Bills 0.031% Due 02/06/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			813,000	[3]
Total short-term U.S. government and Value			812,988	[3]
ProShares Ultra Yen [Member] | U.S. Treasury Bills 0.021% Due 03/05/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	357,000	[4]
Total short-term U.S. government and Value	356,991	[4]
ProShares Ultra Yen [Member] | U.S. Treasury Bills 0.047% Due 04/30/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	931,000
Total short-term U.S. government and Value	930,878
ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Total short-term U.S. government and Value	82,088,299		207,636,383
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.064% Due 06/19/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			9,631,000
Total short-term U.S. government and Value			9,627,404
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.017% Due 02/06/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			2,615,000
Total short-term U.S. government and Value			2,614,962
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.053% Due 02/27/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			2,692,000
Total short-term U.S. government and Value			2,691,895
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.078% Due 05/22/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			14,365,000
Total short-term U.S. government and Value			14,361,648
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.082% Due 04/24/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			4,895,000
Total short-term U.S. government and Value			4,894,086
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.065% Due 04/17/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			13,137,000
Total short-term U.S. government and Value			13,135,659
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.017% Due 03/06/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			6,069,000
Total short-term U.S. government and Value			6,068,469
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.059% Due 03/13/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			12,085,000
Total short-term U.S. government and Value			12,084,060
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.023% Due 03/20/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			15,212,000
Total short-term U.S. government and Value			15,210,048
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.059% Due 04/03/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			44,723,000
Total short-term U.S. government and Value			44,715,087
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.067% Due 04/10/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			10,572,000
Total short-term U.S. government and Value			10,570,705
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.086% Due 05/01/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			46,609,000
Total short-term U.S. government and Value			46,601,297
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.087% Due 05/08/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			20,030,000
Total short-term U.S. government and Value			20,026,144
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.078% Due 06/26/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			5,037,000
Total short-term U.S. government and Value			5,034,919
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.033% Due 01/08/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	3,961,000
Total short-term U.S. government and Value	3,960,990
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.000% Due 01/22/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	305,000
Total short-term U.S. government and Value	304,995
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.000% Due 01/29/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	12,836,000
Total short-term U.S. government and Value	12,835,807
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.011% Due 02/12/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	1,357,000
Total short-term U.S. government and Value	1,356,969
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.018% Due 02/19/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	3,939,000
Total short-term U.S. government and Value	3,938,895
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.023% Due 03/05/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	12,894,000
Total short-term U.S. government and Value	12,893,667
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.036% Due 04/16/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	5,181,000
Total short-term U.S. government and Value	5,180,626
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.056% Due 04/30/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	186,000
Total short-term U.S. government and Value	185,976
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.061% Due 05/14/15[Member]
Schedule of Investments [Line Items]
Principal Amount	4,724,000
Total short-term U.S. government and Value	4,723,221
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.028% Due 05/21/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	6,927,000
Total short-term U.S. government and Value	6,925,663
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.071% Due 05/28/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	11,197,000
Total short-term U.S. government and Value	11,194,275
ProShares VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.087% Due 06/11/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	18,593,000
Total short-term U.S. government and Value	18,587,215
ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Total short-term U.S. government and Value	24,105,906		46,040,233
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.051% Due 03/06/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			2,946,000
Total short-term U.S. government and Value			2,945,742
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.056% Due 03/13/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			2,264,000
Total short-term U.S. government and Value			2,263,824
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.065% Due 06/12/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			934,000
Total short-term U.S. government and Value			933,791
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.066% Due 04/17/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			164,000
Total short-term U.S. government and Value			163,983
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.086% Due 05/08/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			1,000,000
Total short-term U.S. government and Value			999,808
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.083% Due 05/01/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			3,432,000
Total short-term U.S. government and Value			3,431,433
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.011% Due 02/06/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			19,317,000
Total short-term U.S. government and Value			19,316,718
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.046% Due 03/20/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			3,121,000
Total short-term U.S. government and Value			3,120,599
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.071% Due 04/10/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			3,040,000
Total short-term U.S. government and Value			3,039,628
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.066% Due 05/22/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			9,827,000
Total short-term U.S. government and Value			9,824,707
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.071% Due 05/28/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	1,551,000
Total short-term U.S. government and Value	1,550,623
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.087% Due 06/11/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	5,178,000
Total short-term U.S. government and Value	5,176,389
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.012% Due 01/22/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	1,894,000
Total short-term U.S. government and Value	1,893,968
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.012% Due 02/12/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	345,000
Total short-term U.S. government and Value	344,992
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.025% Due 03/05/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	1,563,000
Total short-term U.S. government and Value	1,562,960
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.043% Due 04/16/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	12,807,000
Total short-term U.S. government and Value	12,806,075
ProShares VIX Mid-Term Futures ETF [Member] | U.S. Treasury Bills 0.047% Due 04/30/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	771,000
Total short-term U.S. government and Value	770,899
ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Total short-term U.S. government and Value	182,639,188		109,533,487
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.051% Due 03/06/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			4,280,000
Total short-term U.S. government and Value			4,279,625
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.064% Due 06/19/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			11,560,000
Total short-term U.S. government and Value			11,555,684
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.100% Due 02/13/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			1,326,000
Total short-term U.S. government and Value			1,325,985
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.087% Due 04/17/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			6,764,000
Total short-term U.S. government and Value			6,763,310
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.054% Due 03/13/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			7,790,000
Total short-term U.S. government and Value			7,789,394
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.071% Due 05/22/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			23,839,000
Total short-term U.S. government and Value			23,833,438
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.078% Due 06/26/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			10,907,000
Total short-term U.S. government and Value			10,902,493
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.056% Due 04/03/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			18,200,000
Total short-term U.S. government and Value			18,196,780
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.068% Due 04/10/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			5,109,000
Total short-term U.S. government and Value			5,108,374
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.083% Due 04/24/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			9,924,000
Total short-term U.S. government and Value			9,922,147
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.071% Due 05/01/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			5,689,000
Total short-term U.S. government and Value			5,688,060
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.089% Due 05/08/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			4,169,000
Total short-term U.S. government and Value			4,168,197
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.012% Due 02/12/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	1,436,000
Total short-term U.S. government and Value	1,435,967
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.021% Due 02/19/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	16,715,000
Total short-term U.S. government and Value	16,714,554
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.030% Due 06/11/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	1,854,000
Total short-term U.S. government and Value	1,853,423
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.033% Due 01/08/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	2,925,000
Total short-term U.S. government and Value	2,924,993
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.009% Due 01/22/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	15,872,000
Total short-term U.S. government and Value	15,871,735
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.010% Due 01/29/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	12,113,000
Total short-term U.S. government and Value	12,112,818
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.014% Due 03/05/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	12,248,000
Total short-term U.S. government and Value	12,247,684
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.015% Due 03/12/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	1,602,000
Total short-term U.S. government and Value	1,601,939
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.036% Due 04/16/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	43,147,000
Total short-term U.S. government and Value	43,143,884
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.061% Due 05/14/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	14,824,000
Total short-term U.S. government and Value	14,821,554
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.026% Due 05/21/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	24,222,000
Total short-term U.S. government and Value	24,217,324
ProShares Ultra VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.049% Due 05/28/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	35,702,000
Total short-term U.S. government and Value	35,693,313
ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Total short-term U.S. government and Value	446,975,220		105,559,022
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.088% Due 05/08/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			645,000
Total short-term U.S. government and Value			644,876
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.061% Due 05/22/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			14,609,000
Total short-term U.S. government and Value			14,605,591
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.081% Due 05/01/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			4,968,000
Total short-term U.S. government and Value			4,967,179
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.065% Due 06/12/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			12,444,000
Total short-term U.S. government and Value			12,441,218
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.100% Due 02/13/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			8,128,000
Total short-term U.S. government and Value			8,127,905
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.053% Due 02/27/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			1,793,000
Total short-term U.S. government and Value			1,792,930
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.068% Due 04/10/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			6,065,000
Total short-term U.S. government and Value			6,064,257
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.050% Due 02/06/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			8,766,000
Total short-term U.S. government and Value			8,765,872
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.013% Due 03/06/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			1,232,000
Total short-term U.S. government and Value			1,231,892
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.039% Due 03/13/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			4,585,000
Total short-term U.S. government and Value			4,584,644
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.029% Due 03/20/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			6,029,000
Total short-term U.S. government and Value			6,028,226
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.066% Due 04/03/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			17,343,000
Total short-term U.S. government and Value			17,339,931
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.070% Due 04/17/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			12,309,000
Total short-term U.S. government and Value			12,307,744
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.084% Due 04/24/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			6,658,000
Total short-term U.S. government and Value			6,656,757
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.043% Due 04/16/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	6,920,000
Total short-term U.S. government and Value	6,919,500
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.040% Due 01/08/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	1,850,000
Total short-term U.S. government and Value	1,849,995
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.006% Due 01/22/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	22,078,000
Total short-term U.S. government and Value	22,077,632
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.010% Due 01/29/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	9,864,000
Total short-term U.S. government and Value	9,863,852
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.021% Due 02/19/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	1,830,000
Total short-term U.S. government and Value	1,829,951
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.019% Due 03/05/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	90,719,000
Total short-term U.S. government and Value	90,716,657
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.016% Due 03/12/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	151,190,000
Total short-term U.S. government and Value	151,184,205
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.063% Due 05/14/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	7,752,000
Total short-term U.S. government and Value	7,750,721
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.066% Due 05/21/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	61,759,000
Total short-term U.S. government and Value	61,747,077
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.073% Due 05/28/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	16,216,000
Total short-term U.S. government and Value	16,212,054
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.072% Due 06/04/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	67,517,000
Total short-term U.S. government and Value	67,495,479
ProShares Short VIX Short-Term Futures ETF [Member] | U.S. Treasury Bills 0.030% Due 06/11/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	9,331,000
Total short-term U.S. government and Value	9,328,097
ProShares UltraShort Bloomberg Commodity [Member]
Schedule of Investments [Line Items]
Total short-term U.S. government and Value	4,233,548		3,453,890
ProShares UltraShort Bloomberg Commodity [Member] | U.S. Treasury Bills 0.002% Due 01/22/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	618,000	[1]
Total short-term U.S. government and Value	617,990	[1]
ProShares UltraShort Bloomberg Commodity [Member] | U.S. Treasury Bills 0.022% Due 02/12/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	151,000
Total short-term U.S. government and Value	150,997
ProShares UltraShort Bloomberg Commodity [Member] | U.S. Treasury Bills 0.020% Due 03/05/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	457,000	[1]
Total short-term U.S. government and Value	456,988	[1]
ProShares UltraShort Bloomberg Commodity [Member] | U.S. Treasury Bills 0.039% Due 04/16/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	2,131,000	[1]
Total short-term U.S. government and Value	2,130,846	[1]
ProShares UltraShort Bloomberg Commodity [Member] | U.S. Treasury Bills 0.087% Due 06/11/15 [Member]
Schedule of Investments [Line Items]
Principal Amount	877,000
Total short-term U.S. government and Value	876,727
ProShares UltraShort Bloomberg Commodity [Member] | U.S. Treasury Bills 0.023% due 02/06/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			2,691,000	[1]
Total short-term U.S. government and Value			2,690,961	[1]
ProShares UltraShort Bloomberg Commodity [Member] | U.S. Treasury Bills 0.053% due 02/27/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			290,000
Total short-term U.S. government and Value			289,989
ProShares UltraShort Bloomberg Commodity [Member] | U.S. Treasury Bills 0.040% due 03/20/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			200,000	[1]
Total short-term U.S. government and Value			199,974	[1]
ProShares UltraShort Bloomberg Commodity [Member] | U.S. Treasury Bills 0.061% due 04/10/14 [Member]
Schedule of Investments [Line Items]
Principal Amount			273,000	[1]
Total short-term U.S. government and Value			$272,966	[1]
[1]	All or partial amount pledged as collateral for swap agreements.
[2]	All or partial amount pledged as collateral for forward agreements.
[3]	All or partial amount pledged as collateral for foreign currency forward contracts.
[4]	All or partial amount segregated as collateral for foreign currency forward contracts.

Schedule_of_Investments_ShortT1

Schedule of Investments - Short-Term U.S. Government and Agency Obligations (Parenthetical) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	78.00%		97.00%
Total short-term U.S. government and agency obligations, cost	$131,592,367		$247,573,678
Proshares UltraShort Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	59.00%		80.00%
Total short-term U.S. government and agency obligations, cost	8,672,527		18,274,602
ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	103.00%		107.00%
Total short-term U.S. government and agency obligations, cost	84,038,905		148,987,995
ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	99.00%		102.00%
Total short-term U.S. government and agency obligations, cost	52,225,712		114,822,672
ProShares Short Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	86.00%		89.00%
Total short-term U.S. government and agency obligations, cost	12,086,398		7,901,405
ProShares UltraShort Australian Dollar [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	88.00%		86.00%
Total short-term U.S. government and agency obligations, cost	20,267,681		24,197,046
ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	94.00%		105.00%
Total short-term U.S. government and agency obligations, cost	487,097,789		437,821,545
ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	100.00%		95.00%
Total short-term U.S. government and agency obligations, cost	532,944,509		558,563,134
ProShares Ultra Bloomberg Commodity [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	106.00%		97.00%
Total short-term U.S. government and agency obligations, cost	2,754,883		2,816,627
ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	104.00%		96.00%
Total short-term U.S. government and agency obligations, cost	467,195,638		137,423,179
Proshares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	76.00%		94.00%
Total short-term U.S. government and agency obligations, cost	53,408,848		58,918,095
ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	100.00%		107.00%
Total short-term U.S. government and agency obligations, cost	101,925,636		140,884,104
ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	105.00%		101.00%
Total short-term U.S. government and agency obligations, cost	305,465,636		467,849,038
ProShares Ultra Australian Dollar [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	88.00%		86.00%
Total short-term U.S. government and agency obligations, cost	2,405,682		2,716,026
ProShares Ultra Euro [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	81.00%		94.00%
Total short-term U.S. government and agency obligations, cost	2,415,732		2,455,715
ProShares Ultra Yen [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	61.00%		105.00%
Total short-term U.S. government and agency obligations, cost	1,287,844		2,928,242
ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	74.00%		77.00%
Total short-term U.S. government and agency obligations, cost	82,086,464		207,628,319
ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	112.00%		90.00%
Total short-term U.S. government and agency obligations, cost	24,104,754		46,039,268
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	52.00%		48.00%
Total short-term U.S. government and agency obligations, cost	182,641,263		109,530,861
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	88.00%		74.00%
Total short-term U.S. government and agency obligations, cost	446,972,637		105,554,675
ProShares UltraShort Bloomberg Commodity [Member]
Schedule of Investments [Line Items]
Short-term U.S. government and agency obligations percentage of shareholders' equity	80.00%		91.00%
Total short-term U.S. government and agency obligations, cost	$4,233,396		$3,453,851
U.S. Treasury Bills 0.022% Due 02/06/14 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate			0.02%	[1]
Debt instrument, maturity date			6-Feb-14	[1]
U.S. Treasury Bills 0.052% Due 03/06/14 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate			0.05%	[1]
Debt instrument, maturity date			6-Mar-14	[1]
U.S. Treasury Bills 0.052% Due 03/06/14 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Interest rate			0.05%
Debt instrument, maturity date			6-Mar-14
U.S. Treasury Bills 0.057% Due 03/13/14 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate			0.06%
Debt instrument, maturity date			13-Mar-14
U.S. Treasury Bills 0.057% Due 03/13/14 [Member] | ProShares Short Euro [Member]
Schedule of Investments [Line Items]
Interest rate			0.06%
Debt instrument, maturity date			13-Mar-14
U.S. Treasury Bills 0.042% Due 03/20/14 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate			0.04%	[1]
Debt instrument, maturity date			20-Mar-14	[1]
U.S. Treasury Bills 0.042% Due 03/20/14 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate			0.04%
Debt instrument, maturity date			20-Mar-14
U.S. Treasury Bills 0.042% Due 03/20/14 [Member] | Proshares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate			0.04%
Debt instrument, maturity date			20-Mar-14
U.S. Treasury Bills 0.042% Due 03/20/14 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Interest rate			0.04%	[2]
Debt instrument, maturity date			20-Mar-14	[2]
U.S. Treasury Bills 0.075% Due 04/03/14 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate			0.08%
Debt instrument, maturity date			3-Apr-14
U.S. Treasury Bills 0.061% Due 04/10/14 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate			0.06%	[1]
Debt instrument, maturity date			10-Apr-14	[1]
U.S. Treasury Bills 0.080% Due 04/17/14 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate			0.08%	[1]
Debt instrument, maturity date			17-Apr-14	[1]
U.S. Treasury Bills 0.080% Due 04/17/14 [Member] | Proshares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate			0.08%
Debt instrument, maturity date			17-Apr-14
U.S. Treasury Bills 0.080% Due 04/17/14 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Interest rate			0.08%	[2]
Debt instrument, maturity date			17-Apr-14	[2]
U.S. Treasury Bills 0.080% Due 04/17/14 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Interest rate			0.08%	[2]
Debt instrument, maturity date			17-Apr-14	[2]
U.S. Treasury Bills 0.093% Due 04/24/14 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate			0.09%	[1]
Debt instrument, maturity date			24-Apr-14	[1]
U.S. Treasury Bills 0.093% Due 04/24/14 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Interest rate			0.09%	[2]
Debt instrument, maturity date			24-Apr-14	[2]
U.S. Treasury Bills 0.080% Due 05/01/14 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate			0.08%	[1]
Debt instrument, maturity date			1-May-14	[1]
U.S. Treasury Bills 0.088% Due 05/08/14 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate			0.09%	[1]
Debt instrument, maturity date			8-May-14	[1]
U.S. Treasury Bills 0.088% Due 05/08/14 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Interest rate			0.09%	[2]
Debt instrument, maturity date			8-May-14	[2]
U.S. Treasury Bills 0.088% Due 05/08/14 [Member] | ProShares UltraShort Australian Dollar [Member]
Schedule of Investments [Line Items]
Interest rate			0.09%
Debt instrument, maturity date			8-May-14
U.S. Treasury Bills 0.088% Due 05/08/14 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Interest rate			0.09%	[2]
Debt instrument, maturity date			8-May-14	[2]
U.S. Treasury Bills 0.088% Due 05/08/14 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.09%
Debt instrument, maturity date			8-May-14
U.S. Treasury Bills 0.061% Due 05/22/14 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate			0.06%	[1]
Debt instrument, maturity date			22-May-14	[1]
U.S. Treasury Bills 0.061% Due 05/22/14 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.06%
Debt instrument, maturity date			22-May-14
U.S. Treasury Bills 0.076% Due 06/05/14 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate			0.08%	[1]
Debt instrument, maturity date			5-Jun-14	[1]
U.S. Treasury Bills 0.076% Due 06/05/14 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Interest rate			0.08%	[2]
Debt instrument, maturity date			5-Jun-14	[2]
U.S. Treasury Bills 0.076% Due 06/05/14 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Interest rate			0.08%
Debt instrument, maturity date			5-Jun-14
U.S. Treasury Bills 0.076% Due 06/05/14 [Member] | ProShares Ultra Bloomberg Commodity [Member]
Schedule of Investments [Line Items]
Interest rate			0.08%
Debt instrument, maturity date			5-Jun-14
U.S. Treasury Bills 0.076% Due 06/05/14 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate			0.08%
Debt instrument, maturity date			5-Jun-14
U.S. Treasury Bills 0.076% Due 06/05/14 [Member] | Proshares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate			0.08%
Debt instrument, maturity date			5-Jun-14
U.S. Treasury Bills 0.076% Due 06/05/14 [Member] | ProShares Ultra Euro [Member]
Schedule of Investments [Line Items]
Interest rate			0.08%
Debt instrument, maturity date			5-Jun-14
U.S. Treasury Bills 0.079% Due 06/26/14 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate			0.08%
Debt instrument, maturity date			26-Jun-14
U.S. Treasury Bills 0.049% Due 02/06/14 [Member] | Proshares UltraShort Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate			0.05%
Debt instrument, maturity date			6-Feb-14
U.S. Treasury Bills 0.051% Due 03/06/14 [Member] | Proshares UltraShort Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate			0.05%
Debt instrument, maturity date			6-Mar-14
U.S. Treasury Bills 0.051% Due 03/06/14 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Interest rate			0.05%	[2]
Debt instrument, maturity date			6-Mar-14	[2]
U.S. Treasury Bills 0.051% Due 03/06/14 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Interest rate			0.05%	[2]
Debt instrument, maturity date			6-Mar-14	[2]
U.S. Treasury Bills 0.051% Due 03/06/14 [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.05%
Debt instrument, maturity date			6-Mar-14
U.S. Treasury Bills 0.051% Due 03/06/14 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.05%
Debt instrument, maturity date			6-Mar-14
U.S. Treasury Bills 0.056% Due 03/13/14 [Member] | Proshares UltraShort Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate			0.06%
Debt instrument, maturity date			13-Mar-13
U.S. Treasury Bills 0.056% Due 03/13/14 [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.06%
Debt instrument, maturity date			13-Mar-14
U.S. Treasury Bills 0.034% Due 03/20/14 [Member] | Proshares UltraShort Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate			0.03%
Debt instrument, maturity date			20-Mar-14
U.S. Treasury Bills 0.059% Due 04/10/14 [Member] | Proshares UltraShort Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate			0.06%
Debt instrument, maturity date			10-Apr-14
U.S. Treasury Bills 0.075% Due 04/17/14 [Member] | Proshares UltraShort Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate			0.08%
Debt instrument, maturity date			17-Apr-14
U.S. Treasury Bills 0.075% Due 04/17/14 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Interest rate			0.08%	[2]
Debt instrument, maturity date			17-Apr-14	[2]
U.S. Treasury Bills 0.081% Due 05/01/14 [Member] | Proshares UltraShort Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate			0.08%
Debt instrument, maturity date			1-May-14
U.S. Treasury Bills 0.081% Due 05/01/14 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Interest rate			0.08%	[2]
Debt instrument, maturity date			1-May-14	[2]
U.S. Treasury Bills 0.081% Due 05/01/14 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Interest rate			0.08%	[3]
Debt instrument, maturity date			1-May-14	[3]
U.S. Treasury Bills 0.081% Due 05/01/14 [Member] | ProShares Ultra Bloomberg Commodity [Member]
Schedule of Investments [Line Items]
Interest rate			0.08%	[1]
Debt instrument, maturity date			1-May-14	[1]
U.S. Treasury Bills 0.081% Due 05/01/14 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.08%
Debt instrument, maturity date			1-May-14
U.S. Treasury Bills 0.068% Due 05/08/14 [Member] | Proshares UltraShort Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate			0.07%
Debt instrument, maturity date			8-May-14
U.S. Treasury Bills 0.065% Due 06/12/14 [Member] | Proshares UltraShort Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate			0.07%
Debt instrument, maturity date			12-Jun-14
U.S. Treasury Bills 0.065% Due 06/12/14 [Member] | ProShares UltraShort Australian Dollar [Member]
Schedule of Investments [Line Items]
Interest rate			0.07%
Debt instrument, maturity date			12-Jun-14
U.S. Treasury Bills 0.065% Due 06/12/14 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate			0.07%	[1]
Debt instrument, maturity date			12-Jun-14	[1]
U.S. Treasury Bills 0.065% Due 06/12/14 [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.07%
Debt instrument, maturity date			12-Jun-14
U.S. Treasury Bills 0.065% Due 06/12/14 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.07%
Debt instrument, maturity date			12-Jun-14
U.S. Treasury Bills 0.064% Due 06/19/14 [Member] | Proshares UltraShort Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate			0.06%
Debt instrument, maturity date			19-Jun-14
U.S. Treasury Bills 0.064% Due 06/19/14 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.06%
Debt instrument, maturity date			19-Jun-14
U.S. Treasury Bills 0.064% Due 06/19/14 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.06%
Debt instrument, maturity date			19-Jun-14
U.S. Treasury Bills 0.017% Due 02/06/14 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Interest rate			0.02%	[2]
Debt instrument, maturity date			6-Feb-14	[2]
U.S. Treasury Bills 0.017% Due 02/06/14 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Interest rate			0.02%
Debt instrument, maturity date			6-Feb-14
U.S. Treasury Bills 0.017% Due 02/06/14 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Interest rate			0.02%	[2]
Debt instrument, maturity date			6-Feb-14	[2]
U.S. Treasury Bills 0.017% Due 02/06/14 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.02%
Debt instrument, maturity date			6-Feb-14
U.S. Treasury Bills 0.050% Due 03/06/14 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Interest rate			0.05%
Debt instrument, maturity date			6-Mar-14
U.S. Treasury Bills 0.027% Due 03/20/14 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Interest rate			0.03%	[2]
Debt instrument, maturity date			20-Mar-14	[2]
U.S. Treasury Bills 0.071% Due 04/03/14 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Interest rate			0.07%
Debt instrument, maturity date			3-Apr-14
U.S. Treasury Bills 0.087% Due 05/01/14 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Interest rate			0.09%	[2]
Debt instrument, maturity date			1-May-14	[2]
U.S. Treasury Bills 0.100% Due 02/13/14 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Interest rate			0.10%
Debt instrument, maturity date			13-Feb-14
U.S. Treasury Bills 0.100% Due 02/13/14 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate			0.10%	[1]
Debt instrument, maturity date			13-Feb-14	[1]
U.S. Treasury Bills 0.100% Due 02/13/14 [Member] | Proshares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate			0.10%
Debt instrument, maturity date			13-Feb-14
U.S. Treasury Bills 0.100% Due 02/13/14 [Member] | ProShares Ultra Euro [Member]
Schedule of Investments [Line Items]
Interest rate			0.10%
Debt instrument, maturity date			13-Feb-14
U.S. Treasury Bills 0.100% Due 02/13/14 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.10%
Debt instrument, maturity date			13-Feb-14
U.S. Treasury Bills 0.100% Due 02/13/14 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.10%
Debt instrument, maturity date			13-Feb-14
U.S. Treasury Bills 0.025% Due 03/13/14 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Interest rate			0.03%	[2]
Debt instrument, maturity date			13-Mar-14	[2]
U.S. Treasury Bills 0.047% Due 03/20/14 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Interest rate			0.05%	[2]
Debt instrument, maturity date			20-Mar-14	[2]
U.S. Treasury Bills 0.057% Due 05/22/14 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Interest rate			0.06%	[2]
Debt instrument, maturity date			22-May-14	[2]
U.S. Treasury Bills 0.037% Due 02/06/14 [Member] | ProShares Short Euro [Member]
Schedule of Investments [Line Items]
Interest rate			0.04%
Debt instrument, maturity date			6-Feb-14
U.S. Treasury Bills 0.053% Due 02/27/14 [Member] | ProShares Short Euro [Member]
Schedule of Investments [Line Items]
Interest rate			0.05%
Debt instrument, maturity date			27-Feb-14
U.S. Treasury Bills 0.053% Due 02/27/14 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Interest rate			0.05%	[3]
Debt instrument, maturity date			27-Feb-14	[3]
U.S. Treasury Bills 0.053% Due 02/27/14 [Member] | ProShares Ultra Bloomberg Commodity [Member]
Schedule of Investments [Line Items]
Interest rate			0.05%
Debt instrument, maturity date			27-Feb-14
U.S. Treasury Bills 0.053% Due 02/27/14 [Member] | ProShares Ultra Australian Dollar [Member]
Schedule of Investments [Line Items]
Interest rate			0.05%
Debt instrument, maturity date			27-Feb-14
U.S. Treasury Bills 0.053% Due 02/27/14 [Member] | ProShares Ultra Euro [Member]
Schedule of Investments [Line Items]
Interest rate			0.05%
Debt instrument, maturity date			27-Feb-14
U.S. Treasury Bills 0.053% Due 02/27/14 [Member] | ProShares Ultra Yen [Member]
Schedule of Investments [Line Items]
Interest rate			0.05%
Debt instrument, maturity date			27-Feb-14
U.S. Treasury Bills 0.053% Due 02/27/14 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.05%
Debt instrument, maturity date			27-Feb-14
U.S. Treasury Bills 0.053% Due 02/27/14 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.05%
Debt instrument, maturity date			27-Feb-14
U.S. Treasury Bills 0.053% Due 03/06/14 [Member] | ProShares Short Euro [Member]
Schedule of Investments [Line Items]
Interest rate			0.05%
Debt instrument, maturity date			6-Mar-14
U.S. Treasury Bills 0.053% Due 03/06/14 [Member] | Proshares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate			0.05%
Debt instrument, maturity date			6-Mar-14
U.S. Treasury Bills 0.086% Due 06/12/14 [Member] | ProShares Short Euro [Member]
Schedule of Investments [Line Items]
Interest rate			0.09%
Debt instrument, maturity date			12-Jun-14
U.S. Treasury Bills 0.086% Due 06/12/14 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Interest rate			0.09%	[3]
Debt instrument, maturity date			12-Jun-14	[3]
U.S. Treasury Bills 0.086% Due 06/12/14 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Interest rate			0.09%	[3]
Debt instrument, maturity date			12-Jun-14	[3]
U.S. Treasury Bills 0.086% Due 06/12/14 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Interest rate			0.09%
Debt instrument, maturity date			12-Jun-14
U.S. Treasury Bills 0.086% Due 06/12/14 [Member] | ProShares Ultra Australian Dollar [Member]
Schedule of Investments [Line Items]
Interest rate			0.09%
Debt instrument, maturity date			12-Jun-14
U.S. Treasury Bills 0.086% Due 06/12/14 [Member] | ProShares Ultra Yen [Member]
Schedule of Investments [Line Items]
Interest rate			0.09%
Debt instrument, maturity date			12-Jun-14
U.S. Treasury Bills 0.032% Due 02/06/14 [Member] | ProShares UltraShort Australian Dollar [Member]
Schedule of Investments [Line Items]
Interest rate			0.03%
Debt instrument, maturity date			6-Feb-14
U.S. Treasury Bills 0.061% Due 03/13/14 [Member] | ProShares UltraShort Australian Dollar [Member]
Schedule of Investments [Line Items]
Interest rate			0.06%
Debt instrument, maturity date			13-Mar-14
U.S. Treasury Bills 0.073% Due 04/03/14 [Member] | ProShares UltraShort Australian Dollar [Member]
Schedule of Investments [Line Items]
Interest rate			0.07%
Debt instrument, maturity date			3-Apr-14
U.S. Treasury Bills 0.073% Due 04/03/14 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate			0.07%
Debt instrument, maturity date			3-Apr-14
U.S. Treasury Bills 0.066% Due 04/17/14 [Member] | ProShares UltraShort Australian Dollar [Member]
Schedule of Investments [Line Items]
Interest rate			0.07%
Debt instrument, maturity date			17-Apr-14
U.S. Treasury Bills 0.066% Due 04/17/14 [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.07%
Debt instrument, maturity date			17-Apr-14
U.S. Treasury Bills 0.085% Due 04/24/14 [Member] | ProShares UltraShort Australian Dollar [Member]
Schedule of Investments [Line Items]
Interest rate			0.09%
Debt instrument, maturity date			24-Apr-14
U.S. Treasury Bills 0.085% Due 04/24/14 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate			0.09%
Debt instrument, maturity date			24-Apr-14
U.S. Treasury Bills 0.076% Due 05/01/14 [Member] | ProShares UltraShort Australian Dollar [Member]
Schedule of Investments [Line Items]
Interest rate			0.08%
Debt instrument, maturity date			1-May-14
U.S. Treasury Bills 0.073% Due 05/22/14 [Member] | ProShares UltraShort Australian Dollar [Member]
Schedule of Investments [Line Items]
Interest rate			0.07%
Debt instrument, maturity date			22-May-14
U.S. Treasury Bills 0.014% Due 02/06/14 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Interest rate			0.01%	[3]
Debt instrument, maturity date			6-Feb-14	[3]
U.S. Treasury Bills 0.070% Due 04/03/14 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Interest rate			0.07%
Debt instrument, maturity date			3-Apr-14
U.S. Treasury Bills 0.070% Due 04/03/14 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Interest rate			0.07%
Debt instrument, maturity date			3-Apr-14
U.S. Treasury Bills 0.083% Due 05/08/14 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Interest rate			0.08%	[3]
Debt instrument, maturity date			8-May-14	[3]
U.S. Treasury Bills 0.021% Due 02/06/14 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Interest rate			0.02%	[3]
Debt instrument, maturity date			6-Feb-14	[3]
U.S. Treasury Bills 0.011% Due 03/20/14 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Interest rate			0.01%	[3]
Debt instrument, maturity date			20-Mar-14	[3]
U.S. Treasury Bills 0.011% Due 03/20/14 [Member] | ProShares Ultra Bloomberg Commodity [Member]
Schedule of Investments [Line Items]
Interest rate			0.01%	[1]
Debt instrument, maturity date			20-Mar-14	[1]
U.S. Treasury Bills 0.011% Due 03/20/14 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Interest rate			0.01%	[2]
Debt instrument, maturity date			20-Mar-14	[2]
U.S. Treasury Bills 0.087% Due 04/17/14 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Interest rate			0.09%	[3]
Debt instrument, maturity date			17-Apr-14	[3]
U.S. Treasury Bills 0.087% Due 04/17/14 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.09%
Debt instrument, maturity date			17-Apr-14
U.S. Treasury Bills 0.093% Due 05/01/14 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Interest rate			0.09%	[3]
Debt instrument, maturity date			1-May-14	[3]
U.S. Treasury Bills 0.093% Due 05/01/14 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Interest rate			0.09%
Debt instrument, maturity date			1-May-14
U.S. Treasury Bills 0.086% Due 05/08/14 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Interest rate			0.09%	[3]
Debt instrument, maturity date			8-May-14	[3]
U.S. Treasury Bills 0.086% Due 05/08/14 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate			0.09%	[1]
Debt instrument, maturity date			8-May-14	[1]
U.S. Treasury Bills 0.086% Due 05/08/14 [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.09%
Debt instrument, maturity date			8-May-14
U.S. Treasury Bills 0.078% Due 05/22/14 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Interest rate			0.08%
Debt instrument, maturity date			22-May-14
U.S. Treasury Bills 0.078% Due 05/22/14 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.08%
Debt instrument, maturity date			22-May-14
U.S. Treasury Bills 0.085% Due 06/26/14 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Interest rate			0.09%
Debt instrument, maturity date			26-Jun-14
U.S. Treasury Bills 0.026% Due 02/06/14 [Member] | ProShares Ultra Bloomberg Commodity [Member]
Schedule of Investments [Line Items]
Interest rate			0.03%	[1]
Debt instrument, maturity date			6-Feb-14	[1]
U.S. Treasury Bills 0.016% Due 02/06/14 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate			0.02%	[1]
Debt instrument, maturity date			6-Feb-14	[1]
U.S. Treasury Bills 0.016% Due 02/06/14 [Member] | ProShares Ultra Australian Dollar [Member]
Schedule of Investments [Line Items]
Interest rate			0.02%
Debt instrument, maturity date			6-Feb-14
U.S. Treasury Bills 0.043% Due 03/06/14 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate			0.04%
Debt instrument, maturity date			6-Mar-14
U.S. Treasury Bills 0.054% Due 03/13/14 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate			0.05%
Debt instrument, maturity date			13-Mar-14
U.S. Treasury Bills 0.054% Due 03/13/14 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.05%
Debt instrument, maturity date			13-Mar-14
U.S. Treasury Bills 0.077% Due 04/10/14 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate			0.08%
Debt instrument, maturity date			10-Apr-14
U.S. Treasury Bills 0.077% Due 04/17/14 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate			0.08%	[1]
Debt instrument, maturity date			17-Apr-14	[1]
U.S. Treasury Bills 0.083% Due 05/01/14 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate			0.08%	[1]
Debt instrument, maturity date			1-May-14	[1]
U.S. Treasury Bills 0.083% Due 05/01/14 [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.08%
Debt instrument, maturity date			1-May-14
U.S. Treasury Bills 0.071% Due 05/22/14 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate			0.07%
Debt instrument, maturity date			22-May-14
U.S. Treasury Bills 0.071% Due 05/22/14 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.07%
Debt instrument, maturity date			22-May-14
U.S. Treasury Bills 0.015% Due 02/06/14 [Member] | Proshares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate			0.02%
Debt instrument, maturity date			6-Feb-14
U.S. Treasury Bills 0.055% Due 03/13/14 [Member] | Proshares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate			0.06%
Debt instrument, maturity date			13-Mar-14
U.S. Treasury Bills 0.055% Due 04/03/14 [Member] | Proshares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate			0.06%
Debt instrument, maturity date			3-Apr-14
U.S. Treasury Bills 0.060% Due 04/10/14 [Member] | Proshares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate			0.06%
Debt instrument, maturity date			10-Apr-14
U.S. Treasury Bills 0.082% Due 04/24/14 [Member] | Proshares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate			0.08%
Debt instrument, maturity date			24-Apr-14
U.S. Treasury Bills 0.082% Due 04/24/14 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.08%
Debt instrument, maturity date			24-Apr-14
U.S. Treasury Bills 0.092% Due 05/01/14 [Member] | Proshares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate			0.09%
Debt instrument, maturity date			1-May-14
U.S. Treasury Bills 0.091% Due 05/08/14 [Member] | Proshares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate			0.09%
Debt instrument, maturity date			8-May-14
U.S. Treasury Bills 0.064% Due 05/22/14 [Member] | Proshares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate			0.06%
Debt instrument, maturity date			22-May-14
U.S. Treasury Bills 0.082% Due 06/26/14 [Member] | Proshares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate			0.08%
Debt instrument, maturity date			26-Jun-14
U.S. Treasury Bills 0.070% Due 05/22/14 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Interest rate			0.07%	[2]
Debt instrument, maturity date			22-May-14	[2]
U.S. Treasury Bills 0.010% Due 02/06/14 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Interest rate			0.01%	[2]
Debt instrument, maturity date			6-Feb-14	[2]
U.S. Treasury Bills 0.047% Due 03/06/14 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Interest rate			0.05%	[2]
Debt instrument, maturity date			6-Mar-14	[2]
U.S. Treasury Bills 0.066% Due 04/10/14 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Interest rate			0.07%	[2]
Debt instrument, maturity date			10-Apr-14	[2]
U.S. Treasury Bills 0.069% Due 05/22/14 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Interest rate			0.07%	[2]
Debt instrument, maturity date			22-May-14	[2]
U.S. Treasury Bills 0.065% Due 04/17/14 [Member] | ProShares Ultra Australian Dollar [Member]
Schedule of Investments [Line Items]
Interest rate			0.07%
Debt instrument, maturity date			17-Apr-14
U.S. Treasury Bills 0.065% Due 04/17/14 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.07%
Debt instrument, maturity date			17-Apr-14
U.S. Treasury Bills 0.011% Due 02/06/14 [Member] | ProShares Ultra Euro [Member]
Schedule of Investments [Line Items]
Interest rate			0.01%	[3]
Debt instrument, maturity date			6-Feb-14	[3]
U.S. Treasury Bills 0.011% Due 02/06/14 [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.01%
Debt instrument, maturity date			6-Feb-14
U.S. Treasury Bills 0.021% Due 03/06/14 [Member] | ProShares Ultra Euro [Member]
Schedule of Investments [Line Items]
Interest rate			0.02%	[3]
Debt instrument, maturity date			6-Mar-14	[3]
U.S. Treasury Bills 0.021% Due 03/06/14 [Member] | ProShares Ultra Yen [Member]
Schedule of Investments [Line Items]
Interest rate			0.02%	[3]
Debt instrument, maturity date			6-Mar-14	[3]
U.S. Treasury Bills 0.040% Due 03/20/14 [Member] | ProShares Ultra Euro [Member]
Schedule of Investments [Line Items]
Interest rate			0.04%
Debt instrument, maturity date			20-Mar-14
U.S. Treasury Bills 0.031% Due 02/06/14 [Member] | ProShares Ultra Yen [Member]
Schedule of Investments [Line Items]
Interest rate			0.03%	[3]
Debt instrument, maturity date			6-Feb-14	[3]
U.S. Treasury Bills 0.017% Due 03/06/14 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.02%
Debt instrument, maturity date			6-Mar-14
U.S. Treasury Bills 0.059% Due 03/13/14 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.06%
Debt instrument, maturity date			13-Mar-14
U.S. Treasury Bills 0.023% Due 03/20/14 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.02%
Debt instrument, maturity date			20-Mar-14
U.S. Treasury Bills 0.059% Due 04/03/14 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.06%
Debt instrument, maturity date			3-Apr-14
U.S. Treasury Bills 0.067% Due 04/10/14 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.07%
Debt instrument, maturity date			10-Apr-14
U.S. Treasury Bills 0.086% Due 05/01/14 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.09%
Debt instrument, maturity date			1-May-14
U.S. Treasury Bills 0.087% Due 05/08/14 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.09%
Debt instrument, maturity date			8-May-14
U.S. Treasury Bills 0.078% Due 06/26/14 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.08%
Debt instrument, maturity date			26-Jun-14
U.S. Treasury Bills 0.078% Due 06/26/14 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.08%
Debt instrument, maturity date			26-Jun-14
U.S. Treasury Bills 0.046% Due 03/20/14 [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.05%
Debt instrument, maturity date			20-Mar-14
U.S. Treasury Bills 0.071% Due 04/10/14 [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.07%
Debt instrument, maturity date			10-Apr-14
U.S. Treasury Bills 0.066% Due 05/22/14 [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.07%
Debt instrument, maturity date			22-May-14
U.S. Treasury Bills 0.056% Due 04/03/14 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.06%
Debt instrument, maturity date			3-Apr-14
U.S. Treasury Bills 0.068% Due 04/10/14 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.07%
Debt instrument, maturity date			10-Apr-14
U.S. Treasury Bills 0.068% Due 04/10/14 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.07%
Debt instrument, maturity date			10-Apr-14
U.S. Treasury Bills 0.083% Due 04/24/14 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.08%
Debt instrument, maturity date			24-Apr-14
U.S. Treasury Bills 0.071% Due 05/01/14 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.07%
Debt instrument, maturity date			1-May-14
U.S. Treasury Bills 0.089% Due 05/08/14 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.09%
Debt instrument, maturity date			8-May-14
U.S. Treasury Bills 0.050% Due 02/06/14 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.05%
Debt instrument, maturity date			6-Feb-14
U.S. Treasury Bills 0.013% Due 03/06/14 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.01%
Debt instrument, maturity date			6-Mar-14
U.S. Treasury Bills 0.039% Due 03/13/14 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.04%
Debt instrument, maturity date			13-Mar-14
U.S. Treasury Bills 0.029% Due 03/20/14 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.03%
Debt instrument, maturity date			20-Mar-14
U.S. Treasury Bills 0.066% Due 04/03/14 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.07%
Debt instrument, maturity date			3-Apr-14
U.S. Treasury Bills 0.070% Due 04/17/14 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.07%
Debt instrument, maturity date			17-Apr-14
U.S. Treasury Bills 0.084% Due 04/24/14 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate			0.08%
Debt instrument, maturity date			24-Apr-14
U.S. Treasury Bills 0.033% Due 01/08/15 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.03%
Debt instrument, maturity date	8-Jan-15
U.S. Treasury Bills 0.000% Due 01/22/15 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.00%
Debt instrument, maturity date	22-Jan-15
U.S. Treasury Bills 0.000% Due 01/29/15 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.00%
Debt instrument, maturity date	29-Jan-15
U.S. Treasury Bills 0.011% Due 02/12/15 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.01%
Debt instrument, maturity date	12-Feb-15
U.S. Treasury Bills 0.018% Due 02/19/15 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.02%
Debt instrument, maturity date	19-Feb-15
U.S. Treasury Bills 0.023% Due 03/05/15 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.02%
Debt instrument, maturity date	5-Mar-15
U.S. Treasury Bills 0.036% Due 04/16/15 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.04%
Debt instrument, maturity date	16-Apr-15
U.S. Treasury Bills 0.056% Due 04/30/15 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.06%
Debt instrument, maturity date	30-Apr-15
U.S. Treasury Bills 0.061% Due 05/14/15[Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.06%
Debt instrument, maturity date	14-May-15
U.S. Treasury Bills 0.028% Due 05/21/15 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.03%
Debt instrument, maturity date	21-May-15
U.S. Treasury Bills 0.071% Due 05/28/15 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.07%
Debt instrument, maturity date	28-May-15
U.S. Treasury Bills 0.071% Due 05/28/15 [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.07%
Debt instrument, maturity date	28-May-15
U.S. Treasury Bills 0.087% Due 06/11/15 [Member] | ProShares VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.09%
Debt instrument, maturity date	11-Jun-15
U.S. Treasury Bills 0.087% Due 06/11/15 [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.09%
Debt instrument, maturity date	11-Jun-15
U.S. Treasury Bills 0.012% Due 01/22/15 [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.01%
Debt instrument, maturity date	22-Jan-15
U.S. Treasury Bills 0.012% Due 02/12/15 [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.01%
Debt instrument, maturity date	12-Feb-15
U.S. Treasury Bills 0.012% Due 02/12/15 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.01%
Debt instrument, maturity date	12-Feb-15
U.S. Treasury Bills 0.025% Due 03/05/15 [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.03%
Debt instrument, maturity date	5-Mar-15
U.S. Treasury Bills 0.043% Due 04/16/15 [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.04%
Debt instrument, maturity date	16-Apr-15
U.S. Treasury Bills 0.043% Due 04/16/15 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.04%
Debt instrument, maturity date	16-Apr-15
U.S. Treasury Bills 0.047% Due 04/30/15 [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.05%
Debt instrument, maturity date	30-Apr-15
U.S. Treasury Bills 0.040% Due 01/08/15 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.04%
Debt instrument, maturity date	8-Jan-15
U.S. Treasury Bills 0.006% Due 01/22/15 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.01%
Debt instrument, maturity date	22-Jan-15
U.S. Treasury Bills 0.010% Due 01/29/15 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.01%
Debt instrument, maturity date	29-Jan-15
U.S. Treasury Bills 0.021% Due 02/19/15 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.02%
Debt instrument, maturity date	19-Feb-15
U.S. Treasury Bills 0.021% Due 02/19/15 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.02%
Debt instrument, maturity date	19-Feb-15
U.S. Treasury Bills 0.019% Due 03/05/15 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.02%
Debt instrument, maturity date	5-Mar-15
U.S. Treasury Bills 0.016% Due 03/12/15 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.02%
Debt instrument, maturity date	12-Mar-15
U.S. Treasury Bills 0.063% Due 05/14/15 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.06%
Debt instrument, maturity date	14-May-15
U.S. Treasury Bills 0.066% Due 05/21/15 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.07%
Debt instrument, maturity date	21-May-15
U.S. Treasury Bills 0.073% Due 05/28/15 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.07%
Debt instrument, maturity date	28-May-15
U.S. Treasury Bills 0.072% Due 06/04/15 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.07%
Debt instrument, maturity date	4-Jun-15
U.S. Treasury Bills 0.030% Due 06/11/15 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.03%
Debt instrument, maturity date	11-Jun-15
U.S. Treasury Bills 0.030% Due 06/11/15 [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.03%
Debt instrument, maturity date	11-Jun-15
U.S. Treasury Bills 0.033% Due 01/08/15 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.03%
Debt instrument, maturity date	8-Jan-15
U.S. Treasury Bills 0.009% Due 01/22/15 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.01%
Debt instrument, maturity date	22-Jan-15
U.S. Treasury Bills 0.010% Due 01/29/15 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.01%
Debt instrument, maturity date	29-Jan-15
U.S. Treasury Bills 0.014% Due 03/05/15 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.01%
Debt instrument, maturity date	5-Mar-15
U.S. Treasury Bills 0.015% Due 03/12/15 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.02%
Debt instrument, maturity date	12-Mar-15
U.S. Treasury Bills 0.036% Due 04/16/15 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.04%
Debt instrument, maturity date	16-Apr-15
U.S. Treasury Bills 0.061% Due 05/14/15 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.06%
Debt instrument, maturity date	14-May-15
U.S. Treasury Bills 0.026% Due 05/21/15 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.03%
Debt instrument, maturity date	21-May-15
U.S. Treasury Bills 0.049% Due 05/28/15 [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
Schedule of Investments [Line Items]
Interest rate	0.05%
Debt instrument, maturity date	28-May-15
U.S. Treasury Bills 0.002% Due 01/22/15 [Member] | ProShares UltraShort Bloomberg Commodity [Member]
Schedule of Investments [Line Items]
Interest rate	0.00%	[1]
Debt instrument, maturity date	22-Jan-15	[1]
U.S. Treasury Bills 0.022% Due 02/12/15 [Member] | ProShares UltraShort Bloomberg Commodity [Member]
Schedule of Investments [Line Items]
Interest rate	0.02%
Debt instrument, maturity date	12-Feb-15
U.S. Treasury Bills 0.020% Due 03/05/15 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate	0.02%	[1]
Debt instrument, maturity date	5-Mar-15	[1]
U.S. Treasury Bills 0.020% Due 03/05/15 [Member] | ProShares UltraShort Bloomberg Commodity [Member]
Schedule of Investments [Line Items]
Interest rate	0.02%	[1]
Debt instrument, maturity date	5-Mar-15	[1]
U.S. Treasury Bills 0.039% Due 04/16/15 [Member] | ProShares UltraShort Bloomberg Commodity [Member]
Schedule of Investments [Line Items]
Interest rate	0.04%	[1]
Debt instrument, maturity date	16-Apr-15	[1]
U.S. Treasury Bills 0.087% Due 06/11/15 [Member] | ProShares UltraShort Bloomberg Commodity [Member]
Schedule of Investments [Line Items]
Interest rate	0.09%
Debt instrument, maturity date	11-Jun-15
U.S. Treasury Bills 0.023% due 02/06/14 [Member] | ProShares UltraShort Bloomberg Commodity [Member]
Schedule of Investments [Line Items]
Interest rate			0.02%	[1]
Debt instrument, maturity date			6-Feb-14	[1]
U.S. Treasury Bills 0.053% due 02/27/14 [Member] | ProShares UltraShort Bloomberg Commodity [Member]
Schedule of Investments [Line Items]
Interest rate			0.05%
Debt instrument, maturity date			27-Feb-14
U.S. Treasury Bills 0.040% due 03/20/14 [Member] | ProShares UltraShort Bloomberg Commodity [Member]
Schedule of Investments [Line Items]
Interest rate			0.04%	[1]
Debt instrument, maturity date			20-Mar-14	[1]
U.S. Treasury Bills 0.061% due 04/10/14 [Member] | ProShares UltraShort Bloomberg Commodity [Member]
Schedule of Investments [Line Items]
Interest rate			0.06%	[1]
Debt instrument, maturity date			10-Apr-14	[1]
U.S. Treasury Bills 0.051% Due 01/08/15 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate	0.05%
Debt instrument, maturity date	8-Jan-15
U.S. Treasury Bills 0.051% Due 01/08/15 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Interest rate	0.05%	[2]
Debt instrument, maturity date	8-Jan-15	[2]
U.S. Treasury Bills 0.051% Due 01/08/15 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Interest rate	0.05%	[2]
Debt instrument, maturity date	8-Jan-15	[2]
U.S. Treasury Bills 0.051% Due 01/08/15 [Member] | ProShares Ultra Bloomberg Commodity [Member]
Schedule of Investments [Line Items]
Interest rate	0.05%	[1]
Debt instrument, maturity date	8-Jan-15	[1]
U.S. Treasury Bills 0.051% Due 01/08/15 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate	0.05%
Debt instrument, maturity date	8-Jan-15
U.S. Treasury Bills 0.051% Due 01/08/15 [Member] | Proshares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate	0.05%
Debt instrument, maturity date	8-Jan-15
U.S. Treasury Bills 0.051% Due 01/08/15 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Interest rate	0.05%	[2]
Debt instrument, maturity date	8-Jan-15	[2]
U.S. Treasury Bills 0.010% Due 01/22/15 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate	0.01%
Debt instrument, maturity date	22-Jan-15
U.S. Treasury Bills 0.014% Due 02/12/15 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate	0.01%	[1]
Debt instrument, maturity date	12-Feb-15	[1]
U.S. Treasury Bills 0.024% Due 02/19/15 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate	0.02%	[1]
Debt instrument, maturity date	19-Feb-15	[1]
U.S. Treasury Bills 0.024% Due 02/19/15 [Member] | ProShares Short Euro [Member]
Schedule of Investments [Line Items]
Interest rate	0.02%
Debt instrument, maturity date	19-Feb-15
U.S. Treasury Bills 0.023% Due 03/05/15 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate	0.02%	[1]
Debt instrument, maturity date	5-Mar-15	[1]
U.S. Treasury Bills 0.023% Due 03/05/15 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Interest rate	0.02%	[2]
Debt instrument, maturity date	5-Mar-15	[2]
U.S. Treasury Bills 0.021% Due 03/12/15 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate	0.02%	[1]
Debt instrument, maturity date	12-Mar-15	[1]
U.S. Treasury Bills 0.041% Due 04/16/15 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate	0.04%	[1]
Debt instrument, maturity date	16-Apr-15	[1]
U.S. Treasury Bills 0.041% Due 04/16/15 [Member] | Proshares UltraShort Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate	0.04%
Debt instrument, maturity date	16-Apr-15
U.S. Treasury Bills 0.041% Due 04/16/15 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Interest rate	0.04%	[2]
Debt instrument, maturity date	16-Apr-15	[2]
U.S. Treasury Bills 0.041% Due 04/16/15 [Member] | ProShares Short Euro [Member]
Schedule of Investments [Line Items]
Interest rate	0.04%
Debt instrument, maturity date	16-Apr-15
U.S. Treasury Bills 0.041% Due 04/16/15 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Interest rate	0.04%	[4]
Debt instrument, maturity date	16-Apr-15	[4]
U.S. Treasury Bills 0.041% Due 04/16/15 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Interest rate	0.04%	[4]
Debt instrument, maturity date	16-Apr-15	[4]
U.S. Treasury Bills 0.041% Due 04/16/15 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Interest rate	0.04%	[2]
Debt instrument, maturity date	16-Apr-15	[2]
U.S. Treasury Bills 0.044% Due 04/30/15 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate	0.04%	[1]
Debt instrument, maturity date	30-Apr-15	[1]
U.S. Treasury Bills 0.064% Due 05/14/15 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate	0.06%
Debt instrument, maturity date	14-May-15
U.S. Treasury Bills 0.061% Due 05/21/15 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate	0.06%
Debt instrument, maturity date	21-May-15
U.S. Treasury Bills 0.061% Due 05/21/15 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Interest rate	0.06%	[2]
Debt instrument, maturity date	21-May-15	[2]
U.S. Treasury Bills 0.061% Due 05/21/15 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Interest rate	0.06%
Debt instrument, maturity date	21-May-15
U.S. Treasury Bills 0.061% Due 05/21/15 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Interest rate	0.06%
Debt instrument, maturity date	21-May-15
U.S. Treasury Bills 0.061% Due 05/21/15 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Interest rate	0.06%
Debt instrument, maturity date	21-May-15
U.S. Treasury Bills 0.073% Due 05/28/15 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate	0.07%	[1]
Debt instrument, maturity date	28-May-15	[1]
U.S. Treasury Bills 0.072% Due 06/04/15 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate	0.07%	[1]
Debt instrument, maturity date	4-Jun-15	[1]
U.S. Treasury Bills 0.030% Due 06/11/15 [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate	0.03%
Debt instrument, maturity date	11-Jun-15
U.S. Treasury Bills 0.030% Due 06/11/15 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate	0.03%
Debt instrument, maturity date	11-Jun-15
U.S. Treasury Bills 0.010% Due 02/12/15 [Member] | Proshares UltraShort Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate	0.01%
Debt instrument, maturity date	12-Feb-15
U.S. Treasury Bills 0.010% Due 02/12/15 [Member] | ProShares UltraShort Australian Dollar [Member]
Schedule of Investments [Line Items]
Interest rate	0.01%
Debt instrument, maturity date	12-Feb-15
U.S. Treasury Bills 0.010% Due 02/12/15 [Member] | ProShares Ultra Euro [Member]
Schedule of Investments [Line Items]
Interest rate	0.01%
Debt instrument, maturity date	12-Feb-15
U.S. Treasury Bills 0.021% Due 02/19/15 [Member] | Proshares UltraShort Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate	0.02%
Debt instrument, maturity date	19-Feb-15
U.S. Treasury Bills 0.056% Due 04/30/15 [Member] | Proshares UltraShort Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate	0.06%
Debt instrument, maturity date	30-Apr-15
U.S. Treasury Bills 0.056% Due 04/30/15 [Member] | ProShares UltraShort Australian Dollar [Member]
Schedule of Investments [Line Items]
Interest rate	0.06%
Debt instrument, maturity date	30-Apr-15
U.S. Treasury Bills 0.056% Due 04/30/15 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Interest rate	0.06%	[4]
Debt instrument, maturity date	30-Apr-15	[4]
U.S. Treasury Bills 0.061% Due 05/14/15 [Member] | Proshares UltraShort Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate	0.06%
Debt instrument, maturity date	14-May-15
U.S. Treasury Bills 0.061% Due 05/14/15 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate	0.06%	[1]
Debt instrument, maturity date	14-May-15	[1]
U.S. Treasury Bills 0.061% Due 05/14/15 [Member] | Proshares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate	0.06%
Debt instrument, maturity date	14-May-15
U.S. Treasury Bills 0.035% Due 05/21/15 [Member] | Proshares UltraShort Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate	0.04%
Debt instrument, maturity date	21-May-15
U.S. Treasury Bills 0.035% Due 05/21/15 [Member] | ProShares UltraShort Australian Dollar [Member]
Schedule of Investments [Line Items]
Interest rate	0.04%
Debt instrument, maturity date	21-May-15
U.S. Treasury Bills 0.035% Due 05/21/15 [Member] | ProShares Ultra Euro [Member]
Schedule of Investments [Line Items]
Interest rate	0.04%
Debt instrument, maturity date	21-May-15
U.S. Treasury Bills 0.073% Due 06/04/15 [Member] | Proshares UltraShort Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate	0.07%
Debt instrument, maturity date	4-Jun-15
Us Treasury Bills 0.007% Due 01/22/15 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Interest rate	0.01%
Debt instrument, maturity date	22-Jan-15
Us Treasury Bills 0.021% Due 02/12/15 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Interest rate	0.02%	[2]
Debt instrument, maturity date	12-Feb-15	[2]
U.S. Treasury Bills 0.017% Due 02/19/15 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Interest rate	0.02%	[2]
Debt instrument, maturity date	19-Feb-15	[2]
U.S. Treasury Bills 0.017% Due 02/19/15 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate	0.02%
Debt instrument, maturity date	19-Feb-15
U.S. Treasury Bills 0.015% Due 03/12/15 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Interest rate	0.02%
Debt instrument, maturity date	12-Mar-15
U.S. Treasury Bills 0.015% Due 03/12/15 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Interest rate	0.02%
Debt instrument, maturity date	12-Mar-15
U.S. Treasury Bills 0.015% Due 03/12/15 [Member] | Proshares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate	0.02%
Debt instrument, maturity date	12-Mar-15
U.S. Treasury Bills 0.042% Due 04/30/15 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Interest rate	0.04%	[2]
Debt instrument, maturity date	30-Apr-15	[2]
U.S. Treasury Bills 0.056% Due 05/14/15 [Member] | ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Interest rate	0.06%
Debt instrument, maturity date	14-May-15
U.S. Treasury Bills 0.056% Due 05/14/15 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Interest rate	0.06%	[2]
Debt instrument, maturity date	14-May-15	[2]
U.S. Treasury Bills 0.020% Due 02/12/15 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Interest rate	0.02%	[2]
Debt instrument, maturity date	12-Feb-15	[2]
U.S. Treasury Bills 0.014% Due 02/19/15 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Interest rate	0.01%	[2]
Debt instrument, maturity date	19-Feb-15	[2]
U.S. Treasury Bills 0.030% Due 03/12/15 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Interest rate	0.03%	[2]
Debt instrument, maturity date	12-Mar-15	[2]
U.S. Treasury Bills 0.051% Due 04/30/15 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Interest rate	0.05%	[2]
Debt instrument, maturity date	30-Apr-15	[2]
U.S. Treasury Bills 0.078% Due 06/04/15 [Member] | ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Interest rate	0.08%	[2]
Debt instrument, maturity date	4-Jun-15	[2]
U.S. Treasury Bills 0.078% Due 06/04/15 [Member] | ProShares Short Euro [Member]
Schedule of Investments [Line Items]
Interest rate	0.08%
Debt instrument, maturity date	4-Jun-15
U.S. Treasury Bills 0.078% Due 06/04/15 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Interest rate	0.08%	[2]
Debt instrument, maturity date	4-Jun-15	[2]
U.S. Treasury Bills 0.078% Due 06/04/15 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Interest rate	0.08%	[2]
Debt instrument, maturity date	4-Jun-15	[2]
U.S. Treasury Bills 0.013% Due 02/12/15 [Member] | ProShares Short Euro [Member]
Schedule of Investments [Line Items]
Interest rate	0.01%
Debt instrument, maturity date	12-Feb-15
U.S. Treasury Bills 0.040% Due 04/30/15 [Member] | ProShares Short Euro [Member]
Schedule of Investments [Line Items]
Interest rate	0.04%
Debt instrument, maturity date	30-Apr-15
U.S. Treasury Bills 0.040% Due 04/30/15 [Member] | ProShares Ultra Australian Dollar [Member]
Schedule of Investments [Line Items]
Interest rate	0.04%
Debt instrument, maturity date	30-Apr-15
U.S. Treasury Bills 0.012% Due 02/19/15 [Member] | ProShares UltraShort Australian Dollar [Member]
Schedule of Investments [Line Items]
Interest rate	0.01%
Debt instrument, maturity date	19-Feb-15
U.S. Treasury Bills 0.021% Due 03/05/15 [Member] | ProShares UltraShort Australian Dollar [Member]
Schedule of Investments [Line Items]
Interest rate	0.02%
Debt instrument, maturity date	5-Mar-15
U.S. Treasury Bills 0.021% Due 03/05/15 [Member] | ProShares Ultra Euro [Member]
Schedule of Investments [Line Items]
Interest rate	0.02%	[4]
Debt instrument, maturity date	5-Mar-15	[4]
U.S. Treasury Bills 0.021% Due 03/05/15 [Member] | ProShares Ultra Yen [Member]
Schedule of Investments [Line Items]
Interest rate	0.02%	[4]
Debt instrument, maturity date	5-Mar-15	[4]
U.S. Treasury Bills 0.043% Due 04/16/15 [Member] | ProShares UltraShort Australian Dollar [Member]
Schedule of Investments [Line Items]
Interest rate	0.04%
Debt instrument, maturity date	16-Apr-15
U.S. Treasury Bills 0.087% Due 06/11/15 [Member] | ProShares UltraShort Australian Dollar [Member]
Schedule of Investments [Line Items]
Interest rate	0.09%
Debt instrument, maturity date	11-Jun-15
U.S. Treasury Bills 0.087% Due 06/11/15 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Interest rate	0.09%	[4]
Debt instrument, maturity date	11-Jun-15	[4]
U.S. Treasury Bills 0.011% Due 01/22/15 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Interest rate	0.01%	[4]
Debt instrument, maturity date	22-Jan-15	[4]
U.S. Treasury Bills 0.022% Due 02/12/15 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Interest rate	0.02%
Debt instrument, maturity date	12-Feb-15
U.S. Treasury Bills 0.010% Due 02/19/15 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Interest rate	0.01%	[4]
Debt instrument, maturity date	19-Feb-15	[4]
U.S. Treasury Bills 0.010% Due 02/19/15 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Interest rate	0.01%	[2]
Debt instrument, maturity date	19-Feb-15	[2]
U.S. Treasury Bills 0.027% Due 03/05/15 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Interest rate	0.03%	[4]
Debt instrument, maturity date	5-Mar-15	[4]
U.S. Treasury Bills 0.048% Due 04/30/15 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Interest rate	0.05%	[4]
Debt instrument, maturity date	30-Apr-15	[4]
U.S. Treasury Bills 0.070% Due 05/28/15 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Interest rate	0.07%
Debt instrument, maturity date	28-May-15
U.S. Treasury Bills 0.082% Due 06/04/15 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Interest rate	0.08%	[4]
Debt instrument, maturity date	4-Jun-15	[4]
U.S. Treasury Bills 0.090% Due 06/11/15 [Member] | ProShares UltraShort Euro [Member]
Schedule of Investments [Line Items]
Interest rate	0.09%	[4]
Debt instrument, maturity date	11-Jun-15	[4]
U.S. Treasury Bills 0.090% Due 06/11/15 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Interest rate	0.09%	[2]
Debt instrument, maturity date	11-Jun-15	[2]
U.S. Treasury Bills 0.017% Due 01/29/15 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Interest rate	0.02%
Debt instrument, maturity date	29-Jan-15
U.S. Treasury Bills 0.019% Due 02/12/15 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Interest rate	0.02%	[4]
Debt instrument, maturity date	12-Feb-15	[4]
U.S. Treasury Bills 0.027% Due 02/19/15 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Interest rate	0.03%	[4]
Debt instrument, maturity date	19-Feb-15	[4]
U.S. Treasury Bills 0.026% Due 03/05/15 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Interest rate	0.03%	[4]
Debt instrument, maturity date	5-Mar-15	[4]
U.S. Treasury Bills 0.014% Due 03/12/15 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Interest rate	0.01%
Debt instrument, maturity date	12-Mar-15
U.S. Treasury Bills 0.014% Due 03/12/15 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate	0.01%
Debt instrument, maturity date	12-Mar-15
U.S. Treasury Bills 0.063% Due 05/14/15 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Interest rate	0.06%
Debt instrument, maturity date	14-May-15
U.S. Treasury Bills 0.070% Due 05/21/15 [Member] | ProShares UltraShort Yen [Member]
Schedule of Investments [Line Items]
Interest rate	0.07%
Debt instrument, maturity date	21-May-15
U.S. Treasury Bills 0.019% Due 02/19/15 [Member] | ProShares Ultra Bloomberg Commodity [Member]
Schedule of Investments [Line Items]
Interest rate	0.02%	[1]
Debt instrument, maturity date	19-Feb-15	[1]
U.S. Treasury Bills 0.047% Due 04/30/15 [Member] | ProShares Ultra Bloomberg Commodity [Member]
Schedule of Investments [Line Items]
Interest rate	0.05%
Debt instrument, maturity date	30-Apr-15
U.S. Treasury Bills 0.047% Due 04/30/15 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Interest rate	0.05%	[2]
Debt instrument, maturity date	30-Apr-15	[2]
U.S. Treasury Bills 0.047% Due 04/30/15 [Member] | ProShares Ultra Euro [Member]
Schedule of Investments [Line Items]
Interest rate	0.05%	[4]
Debt instrument, maturity date	30-Apr-15	[4]
U.S. Treasury Bills 0.047% Due 04/30/15 [Member] | ProShares Ultra Yen [Member]
Schedule of Investments [Line Items]
Interest rate	0.05%
Debt instrument, maturity date	30-Apr-15
U.S. Treasury Bills 0.015% Due 01/22/15 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate	0.02%
Debt instrument, maturity date	22-Jan-15
U.S. Treasury Bills 0.009% Due 01/29/15 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate	0.01%
Debt instrument, maturity date	29-Jan-15
U.S. Treasury Bills 0.039% Due 04/16/15 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate	0.04%	[1]
Debt instrument, maturity date	16-Apr-15	[1]
U.S. Treasury Bills 0.049% Due 04/30/15 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate	0.05%	[1]
Debt instrument, maturity date	30-Apr-15	[1]
U.S. Treasury Bills 0.051% Due 05/21/15 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate	0.05%	[1]
Debt instrument, maturity date	21-May-15	[1]
U.S. Treasury Bills 0.071% Due 05/28/15 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate	0.07%	[1]
Debt instrument, maturity date	28-May-15	[1]
U.S. Treasury Bills 0.074% Due 06/04/15 [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Interest rate	0.07%	[1]
Debt instrument, maturity date	4-Jun-15	[1]
U.S. Treasury Bills 0.008% Due 01/22/15 [Member] | Proshares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate	0.01%
Debt instrument, maturity date	22-Jan-15
U.S. Treasury Bills 0.010% Due 01/29/15 [Member] | Proshares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate	0.01%
Debt instrument, maturity date	29-Jan-15
U.S. Treasury Bills 0.010% Due 01/29/15 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Interest rate	0.01%	[2]
Debt instrument, maturity date	29-Jan-15	[2]
U.S. Treasury Bills 0.018% Due 02/12/15 [Member] | Proshares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate	0.02%
Debt instrument, maturity date	12-Feb-15
U.S. Treasury Bills 0.024% Due 03/05/15 [Member] | Proshares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate	0.02%
Debt instrument, maturity date	5-Mar-15
U.S. Treasury Bills 0.037% Due 04/16/15 [Member] | Proshares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate	0.04%
Debt instrument, maturity date	16-Apr-15
U.S. Treasury Bills 0.054% Due 04/30/15 [Member] | Proshares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate	0.05%
Debt instrument, maturity date	30-Apr-15
U.S. Treasury Bills 0.056% Due 05/21/15 [Member] | Proshares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate	0.06%
Debt instrument, maturity date	21-May-15
U.S. Treasury Bills 0.060% Due 05/28/15 [Member] | Proshares Ultra Bloomberg Natural Gas [Member]
Schedule of Investments [Line Items]
Interest rate	0.06%
Debt instrument, maturity date	28-May-15
U.S. Treasury Bills 0.045% Due 04/30/15 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Interest rate	0.05%	[2]
Debt instrument, maturity date	30-Apr-15	[2]
U.S. Treasury Bills 0.057% Due 05/14/15 [Member] | ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Interest rate	0.06%	[2]
Debt instrument, maturity date	14-May-15	[2]
U.S. Treasury Bills 0.016% Due 01/22/15 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Interest rate	0.02%
Debt instrument, maturity date	22-Jan-15
U.S. Treasury Bills 0.012% Due 01/29/15 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Interest rate	0.01%
Debt instrument, maturity date	29-Jan-15
U.S. Treasury Bills 0.011% Due 02/12/15 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Interest rate	0.01%	[2]
Debt instrument, maturity date	12-Feb-15	[2]
U.S. Treasury Bills 0.020% Due 02/19/15 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Interest rate	0.02%	[2]
Debt instrument, maturity date	19-Feb-15	[2]
U.S. Treasury Bills 0.012% Due 03/05/15 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Interest rate	0.01%	[2]
Debt instrument, maturity date	5-Mar-15	[2]
U.S. Treasury Bills 0.060% Due 05/14/15 [Member] | ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Interest rate	0.06%	[2]
Debt instrument, maturity date	14-May-15	[2]
U.S. Treasury Bills 0.036% Due 04/16/15 [Member] | ProShares Ultra Euro [Member]
Schedule of Investments [Line Items]
Interest rate	0.04%
Debt instrument, maturity date	16-Apr-15
[1]	All or partial amount pledged as collateral for swap agreements.
[2]	All or partial amount pledged as collateral for forward agreements.
[3]	All or partial amount pledged as collateral for foreign currency forward contracts.
[4]	All or partial amount segregated as collateral for foreign currency forward contracts.

Schedule_of_Investments_Swap_A

Schedule of Investments - Swap Agreements (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
ProShares UltraShort Bloomberg Commodity [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)	$567,259	[1]	($27,665)	[2]
ProShares UltraShort Bloomberg Commodity [Member] | Swap Agreement with Deutsche Bank AG Based on Bloomberg Commodity Index [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	0.25%	[1],[3]	0.25%	[2],[4]
Termination Date	6-Jan-15	[1]	6-Jan-14	[2]
Notional Amount at Value	-4,847,743	[1],[5]	-2,912,629	[2],[5]
Unrealized Appreciation (Depreciation)	243,474	[1]	-11,710	[2]
ProShares UltraShort Bloomberg Commodity [Member] | Swap Agreement with Goldman Sachs International Based on Bloomberg Commodity Index [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	0.25%	[1],[3]	0.25%	[2],[4]
Termination Date	6-Jan-15	[1]	6-Jan-14	[2]
Notional Amount at Value	-4,242,243	[1],[5]	-3,114,183	[2],[5]
Unrealized Appreciation (Depreciation)	240,271	[1]	-12,945	[2]
ProShares UltraShort Bloomberg Commodity [Member] | Swap Agreement with UBS AG Based on Bloomberg Commodity Index [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	0.60%	[1],[3]	0.60%	[2],[4]
Termination Date	6-Jan-15	[1]	6-Jan-14	[2]
Notional Amount at Value	-1,460,197	[1],[5]	-1,567,698	[2],[5]
Unrealized Appreciation (Depreciation)	83,514	[1]	-3,010	[2]
ProShares UltraShort Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)	27,018,077	[1]	-2,332,900	[2]
ProShares UltraShort Bloomberg Crude Oil [Member] | Swap Agreement with Deutsche Bank AG Based on Bloomberg WTI Crude Oil Subindex [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	0.25%	[1],[3]	0.25%	[2],[4]
Termination Date	6-Jan-15	[1]	6-Jan-14	[2]
Notional Amount at Value	-66,394,305	[1],[5]	-81,834,893	[2],[5]
Unrealized Appreciation (Depreciation)	7,669,493	[1]	-570,114	[2]
ProShares UltraShort Bloomberg Crude Oil [Member] | Swap Agreement with Goldman Sachs International Based on Bloomberg WTI Crude Oil Subindex [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	0.25%	[1],[3]	0.25%	[2],[4]
Termination Date	6-Jan-15	[1]	6-Jan-14	[2]
Notional Amount at Value	-57,892,826	[1],[5]	-79,971,962	[2],[5]
Unrealized Appreciation (Depreciation)	8,362,336	[1]	-632,990	[2]
ProShares UltraShort Bloomberg Crude Oil [Member] | Swap Agreement with Societe Generale S.A. Based on Bloomberg WTI Crude Oil Subindex [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	0.25%	[1],[3]	0.25%	[2],[4]
Termination Date	6-Jan-15	[1]	6-Jan-14	[2]
Notional Amount at Value	-21,413,784	[1],[5]	-53,493,455	[2],[5]
Unrealized Appreciation (Depreciation)	2,132,657	[1]	-402,586	[2]
ProShares UltraShort Bloomberg Crude Oil [Member] | Swap Agreement with UBS AG Based on Bloomberg WTI Crude Oil Subindex [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	0.25%	[1],[3]	0.25%	[2],[4]
Termination Date	6-Jan-15	[1]	6-Jan-14	[2]
Notional Amount at Value	-54,735,210	[1],[5]	-79,680,364	[2],[5]
Unrealized Appreciation (Depreciation)	8,853,591	[1]	-727,210	[2]
ProShares Ultra Bloomberg Commodity [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)	-331,338	[1]	15,078	[1],[2]
ProShares Ultra Bloomberg Commodity [Member] | Swap Agreement with Deutsche Bank AG Based on Bloomberg Commodity Index [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	0.25%	[1],[3]	0.25%	[2],[4]
Termination Date	6-Jan-15	[1]	6-Jan-14	[2]
Notional Amount at Value	2,207,567	[1],[5]	2,549,441	[2],[5]
Unrealized Appreciation (Depreciation)	-143,751	[1]	6,454	[2]
ProShares Ultra Bloomberg Commodity [Member] | Swap Agreement with Goldman Sachs International Based on Bloomberg Commodity Index [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	0.25%	[1],[3]	0.25%	[2],[4]
Termination Date	6-Jan-15	[1]	6-Jan-14	[2]
Notional Amount at Value	2,221,450	[1],[5]	2,157,299	[2],[5]
Unrealized Appreciation (Depreciation)	-138,532	[1]	4,974	[2]
ProShares Ultra Bloomberg Commodity [Member] | Swap Agreement with UBS AG Based on Bloomberg Commodity Index [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	0.60%	[1],[3]	0.60%	[2],[4]
Termination Date	6-Jan-15	[1]	6-Jan-14	[2]
Notional Amount at Value	780,251	[1],[5]	1,113,381	[2],[5]
Unrealized Appreciation (Depreciation)	-49,055	[1]	3,650	[2]
ProShares Ultra Bloomberg Crude Oil [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)	-76,181,097	[1]	1,957,893	[2]
ProShares Ultra Bloomberg Crude Oil [Member] | Swap Agreement with Deutsche Bank AG Based on Bloomberg WTI Crude Oil Subindex [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	0.25%	[1],[3]	0.25%	[2],[4]
Termination Date	6-Jan-15	[1]	6-Jan-14	[2]
Notional Amount at Value	165,659,833	[1],[5]	52,210,040	[2],[5]
Unrealized Appreciation (Depreciation)	-24,223,667	[1]	622,117	[2]
ProShares Ultra Bloomberg Crude Oil [Member] | Swap Agreement with Goldman Sachs International Based on Bloomberg WTI Crude Oil Subindex [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	0.25%	[1],[3]	0.25%	[2],[4]
Termination Date	6-Jan-15	[1]	6-Jan-14	[2]
Notional Amount at Value	151,188,034	[1],[5]	54,411,119	[2],[5]
Unrealized Appreciation (Depreciation)	-24,285,701	[1]	576,723	[2]
ProShares Ultra Bloomberg Crude Oil [Member] | Swap Agreement with Societe Generale S.A. Based on Bloomberg WTI Crude Oil Subindex [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	0.25%	[1],[3]	0.25%	[2],[4]
Termination Date	6-Jan-15	[1]	6-Jan-14	[2]
Notional Amount at Value	39,239,652	[1],[5]	26,715,890	[2],[5]
Unrealized Appreciation (Depreciation)	-5,528,160	[1]	275,816	[2]
ProShares Ultra Bloomberg Crude Oil [Member] | Swap Agreement with UBS AG Based on Bloomberg WTI Crude Oil Subindex [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	0.25%	[1],[3]	0.25%	[2],[4]
Termination Date	6-Jan-15	[1]	6-Jan-14	[2]
Notional Amount at Value	156,716,204	[1],[5]	43,518,797	[2],[5]
Unrealized Appreciation (Depreciation)	($22,143,569)	[1]	$483,237	[2]
[1]	The positions and counterparties herein are as of December 31, 2014. The Funds continually evaluate different counterparties for their transactions and counterparties are subject to change. New counterparties can be added at any time.
[2]	The positions and counterparties herein are as of December 31, 2013. 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, 2014, on the notional amount of the swap agreement paid to the counterparty or received from the counterparty, excluding any commissions.
[4]	Reflects the floating financing rate, as of December 31, 2013, on the notional amount of the swap agreement paid to the counterparty or received from the counterparty, excluding any commissions.
[5]	For swap agreements, a positive amount represents "long" exposure to the benchmark index. A negative amount represents "short" exposure to the benchmark index.

Schedule_of_Investments_Forwar

Schedule of Investments - Forward Agreements (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
ProShares UltraShort Gold [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)	($2,282,778)	[1]	$5,633,053	[2]
ProShares UltraShort Gold [Member] | Forward Agreements with Deutsche Bank AG Based on 0.995 Fine Troy Ounce Gold [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	0.34%	[1],[3]	0.30%	[2],[4]
Settlement Date	6-Jan-15	[1]	6-Jan-14	[2]
Commitment to (Deliver)/Receive	-70,900	[1]	-112,800	[2]
Notional Amount at Value	-85,504,691	[1],[5]	-135,867,600	[2],[5]
Unrealized Appreciation (Depreciation)	-1,422,997	[1]	2,258,281	[2]
ProShares UltraShort Gold [Member] | Forward Agreements with Goldman Sachs International Based on 0.995 Fine Troy Ounce Gold [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	0.44%	[1],[3]	0.40%	[2],[4]
Settlement Date	6-Jan-15	[1]	6-Jan-14	[2]
Commitment to (Deliver)/Receive	-26,898	[1]	-46,698	[2]
Notional Amount at Value	-32,438,719	[1],[5]	-56,247,741	[2],[5]
Unrealized Appreciation (Depreciation)	-354,660	[1]	1,411,290	[2]
ProShares UltraShort Gold [Member] | Forward Agreements with Societe Generale S.A. Based on 0.995 Fine Troy Ounce Gold [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	0.54%	[1],[3]	0.50%	[2],[4]
Settlement Date	6-Jan-15	[1]	6-Jan-14	[2]
Commitment to (Deliver)/Receive	-13,700	[1]	-20,700	[2]
Notional Amount at Value	-16,522,063	[1],[5]	-24,933,150	[2],[5]
Unrealized Appreciation (Depreciation)	-182,225	[1]	665,044	[2]
ProShares UltraShort Gold [Member] | Forward Agreements with UBS AG Based on 0.995 Fine Troy Ounce Gold [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	0.44%	[1],[3]	0.40%	[2],[4]
Settlement Date	6-Jan-15	[1]	6-Jan-14	[2]
Commitment to (Deliver)/Receive	-24,050	[1]	-51,150	[2]
Notional Amount at Value	-29,004,060	[1],[5]	-61,610,175	[2],[5]
Unrealized Appreciation (Depreciation)	-322,896	[1]	1,298,438	[2]
ProShares Ultra Silver [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)	-12,395,120		-2,492,880	[2]
ProShares Ultra Silver [Member] | Forward Agreements with Deutsche Bank AG Based on 0.999 Fine Troy Ounce Silver [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	0.97%	[3]	0.30%	[2],[4]
Settlement Date	6-Jan-15		6-Jan-14	[2]
Commitment to (Deliver)/Receive	19,068,000		25,659,000	[2]
Notional Amount at Value	304,550,282	[5]	500,401,818	[2],[5]
Unrealized Appreciation (Depreciation)	-6,220,069		-350,663	[2]
ProShares Ultra Silver [Member] | Forward Agreements with Goldman Sachs International Based on 0.999 Fine Troy Ounce Silver [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	1.05%	[3]	0.45%	[2],[4]
Settlement Date	6-Jan-15		6-Jan-14	[2]
Commitment to (Deliver)/Receive	7,100,800		8,597,800	[2]
Notional Amount at Value	113,411,137	[5]	167,674,296	[2],[5]
Unrealized Appreciation (Depreciation)	-2,124,796		-1,345,433	[2]
ProShares Ultra Silver [Member] | Forward Agreements with Societe Generale S.A. Based on 0.999 Fine Troy Ounce Silver [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	1.09%	[3]	0.50%	[2],[4]
Settlement Date	6-Jan-15		6-Jan-14	[2]
Commitment to (Deliver)/Receive	4,628,000		4,952,000	[2]
Notional Amount at Value	73,916,565	[5]	96,573,904	[2],[5]
Unrealized Appreciation (Depreciation)	-1,384,207		-28,581	[2]
ProShares Ultra Silver [Member] | Forward Agreements with UBS AG Based on 0.999 Fine Troy Ounce Silver [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	1.05%	[3]	0.45%	[2],[4]
Settlement Date	6-Jan-15		6-Jan-14	[2]
Commitment to (Deliver)/Receive	5,653,000		8,516,000	[2]
Notional Amount at Value	90,287,455	[5]	166,079,032	[2],[5]
Unrealized Appreciation (Depreciation)	-2,666,048		-768,203	[2]
ProShares UltraShort Silver [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)	594,953	[1]	-2,227,857	[2]
ProShares UltraShort Silver [Member] | Forward Agreements with Deutsche Bank AG Based on 0.999 Fine Troy Ounce Silver [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	-0.37%	[1],[3]	0.30%	[2],[4]
Settlement Date	6-Jan-15	[1]	6-Jan-14	[2]
Commitment to (Deliver)/Receive	-3,409,000	[1]	-6,145,000	[2]
Notional Amount at Value	-54,447,866	[1],[5]	-119,839,790	[2],[5]
Unrealized Appreciation (Depreciation)	462,619	[1]	-445,752	[2]
ProShares UltraShort Silver [Member] | Forward Agreements with Goldman Sachs International Based on 0.999 Fine Troy Ounce Silver [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	-0.20%	[1],[3]	0.40%	[2],[4]
Settlement Date	6-Jan-15	[1]	6-Jan-14	[2]
Commitment to (Deliver)/Receive	-1,195,500	[1]	-2,366,500	[2]
Notional Amount at Value	-19,094,048	[1],[5]	-46,151,483	[2],[5]
Unrealized Appreciation (Depreciation)	138,563	[1]	-1,257,636	[2]
ProShares UltraShort Silver [Member] | Forward Agreements with Societe Generale S.A. Based on 0.999 Fine Troy Ounce Silver [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	-0.09%	[1],[3]	0.50%	[2],[4]
Settlement Date	6-Jan-15	[1]	6-Jan-14	[2]
Commitment to (Deliver)/Receive	-687,000	[1]	-1,163,000	[2]
Notional Amount at Value	-10,972,489	[1],[5]	-22,680,826	[2],[5]
Unrealized Appreciation (Depreciation)	198,341	[1]	-7,359	[2]
ProShares UltraShort Silver [Member] | Forward Agreements with UBS AG Based on 0.999 Fine Troy Ounce Silver [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	-0.15%	[1],[3]	0.45%	[2],[4]
Settlement Date	6-Jan-15	[1]	6-Jan-14	[2]
Commitment to (Deliver)/Receive	-1,336,000	[1]	-1,903,000	[2]
Notional Amount at Value	-21,338,058	[1],[5]	-37,112,306	[2],[5]
Unrealized Appreciation (Depreciation)	-204,570	[1]	-517,110	[2]
ProShares Ultra Gold [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)	2,051,154	[1]	-6,812,974	[2]
ProShares Ultra Gold [Member] | Forward Agreements with Deutsche Bank AG Based on 0.995 Fine Troy Ounce Gold [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	0.26%	[1],[3]	0.30%	[2],[4]
Settlement Date	6-Jan-15	[1]	6-Jan-14	[2]
Commitment to (Deliver)/Receive	90,800	[1]	108,500	[2]
Notional Amount at Value	109,503,892	[1],[5]	130,688,250	[5]
Unrealized Appreciation (Depreciation)	1,231,694	[1]	-3,543,937	[2]
ProShares Ultra Gold [Member] | Forward Agreements with Goldman Sachs International Based on 0.995 Fine Troy Ounce Gold [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	0.41%	[1],[3]	0.45%	[2],[4]
Settlement Date	6-Jan-15	[1]	6-Jan-14	[2]
Commitment to (Deliver)/Receive	31,420	[1]	44,820	[2]
Notional Amount at Value	37,892,206	[1],[5]	53,985,690	[5]
Unrealized Appreciation (Depreciation)	222,126	[1]	-1,327,335	[2]
ProShares Ultra Gold [Member] | Forward Agreements with Societe Generale S.A. Based on 0.995 Fine Troy Ounce Gold [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	0.46%	[1],[3]	0.50%	[2],[4]
Settlement Date	6-Jan-15	[1]	6-Jan-14	[2]
Commitment to (Deliver)/Receive	15,200	[1]	28,100	[2]
Notional Amount at Value	18,331,048	[1],[5]	33,846,450	[5]
Unrealized Appreciation (Depreciation)	190,591	[1]	-785,038	[2]
ProShares Ultra Gold [Member] | Forward Agreements with UBS AG Based on 0.995 Fine Troy Ounce Gold [Member]
Schedule of Investments [Line Items]
Rate Paid (Received)	0.36%	[1],[3]	0.40%	[2],[4]
Settlement Date	6-Jan-15	[1]	6-Jan-14	[2]
Commitment to (Deliver)/Receive	31,600	[1]	37,600	[2]
Notional Amount at Value	38,109,284	[1],[5]	45,289,200	[5]
Unrealized Appreciation (Depreciation)	$406,743	[1]	($1,156,664)	[2]
[1]	The positions and counterparties herein are as of December 31, 2014. The Funds continually evaluate different counterparties for their transactions and counterparties are subject to change. New counterparties can be added at any time.
[2]	The positions and counterparties herein are as of December 31, 2013. 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, 2014, on the notional amount of the forward agreement paid to the counterparty or received from the counterparty, excluding any commissions.
[4]	Reflects the floating financing rate, as of December 31, 2013, on the notional amount of the forward agreement paid to the counterparty or received from the counterparty, excluding any commissions.
[5]	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_Foreig

Schedule of Investments - Foreign Currency Forward Contracts (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
ProShares UltraShort Euro [Member] | Contracts to Purchase [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)	($2,256,771)		$151,351	[1]
ProShares UltraShort Euro [Member] | Contracts to Sell [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)	19,019,765		-13,899,858	[1]
ProShares UltraShort Euro [Member] | Euro with Goldman Sachs International [Member] | Contracts to Purchase [Member]
Schedule of Investments [Line Items]
Settlement Date	9-Jan-15	[2]	10-Jan-14	[1]
Local Currency	31,647,600	[2]	19,352,500	[1]
Notional Amount at Value	38,298,521	[2]	26,625,017	[1]
Unrealized Appreciation (Depreciation)	-1,118,702	[2]	64,104	[1]
ProShares UltraShort Euro [Member] | Euro with Goldman Sachs International [Member] | Contracts to Sell [Member]
Schedule of Investments [Line Items]
Settlement Date	9-Jan-15		10-Jan-14	[1]
Local Currency	-443,778,725		-323,915,825	[1]
Notional Amount at Value	-537,041,321		-445,640,837	[1]
Unrealized Appreciation (Depreciation)	9,312,005		-6,820,802	[1]
ProShares UltraShort Euro [Member] | Euro with UBS AG [Member] | Contracts to Purchase [Member]
Schedule of Investments [Line Items]
Settlement Date	9-Jan-15	[2]	10-Jan-14	[1]
Local Currency	40,314,300	[2]	35,427,500	[1]
Notional Amount at Value	48,786,577	[2]	48,740,875	[1]
Unrealized Appreciation (Depreciation)	-1,138,069	[2]	87,247	[1]
ProShares UltraShort Euro [Member] | Euro with UBS AG [Member] | Contracts to Sell [Member]
Schedule of Investments [Line Items]
Settlement Date	9-Jan-15		10-Jan-14	[1]
Local Currency	-483,290,100		-338,474,500	[1]
Notional Amount at Value	-584,856,233		-465,670,547	[1]
Unrealized Appreciation (Depreciation)	9,707,760		-7,079,056	[1]
ProShares UltraShort Yen [Member] | Contracts to Purchase [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)	-2,079,353	[2]	-1,930,884	[1]
ProShares UltraShort Yen [Member] | Contracts to Sell [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)	500,578	[2]	31,317,568	[1]
ProShares UltraShort Yen [Member] | Yen with Goldman Sachs International [Member] | Contracts to Purchase [Member]
Schedule of Investments [Line Items]
Settlement Date	9-Jan-15	[2]	10-Jan-14	[1]
Local Currency	8,266,326,300	[2]	3,967,682,500	[1]
Notional Amount at Value	69,025,668	[2]	37,685,648	[1]
Unrealized Appreciation (Depreciation)	-1,395,668	[2]	-884,849	[1]
ProShares UltraShort Yen [Member] | Yen with Goldman Sachs International [Member] | Contracts to Sell [Member]
Schedule of Investments [Line Items]
Settlement Date	9-Jan-15	[1],[2]	10-Jan-14	[1]
Local Currency	-72,481,612,100	[1],[2]	-66,470,096,200	[1]
Notional Amount at Value	-605,237,623	[1],[2]	-631,343,013	[1]
Unrealized Appreciation (Depreciation)	-70,571	[1],[2]	15,716,318	[1]
ProShares UltraShort Yen [Member] | Yen with UBS AG [Member] | Contracts to Purchase [Member]
Schedule of Investments [Line Items]
Settlement Date	9-Jan-15	[2]	10-Jan-14	[1]
Local Currency	13,530,509,400	[2]	3,710,762,600	[1]
Notional Amount at Value	112,982,770	[2]	35,245,383	[1]
Unrealized Appreciation (Depreciation)	-683,685	[2]	-1,046,035	[1]
ProShares UltraShort Yen [Member] | Yen with UBS AG [Member] | Contracts to Sell [Member]
Schedule of Investments [Line Items]
Settlement Date	9-Jan-15	[2]	10-Jan-14	[1]
Local Currency	-76,736,367,800	[2]	-65,021,781,500	[1]
Notional Amount at Value	-640,765,782	[2]	-617,586,701	[1]
Unrealized Appreciation (Depreciation)	571,149	[2]	15,601,250	[1]
ProShares Ultra Euro [Member] | Contracts to Purchase [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)	-106,292	[1]	120,908	[1]
ProShares Ultra Euro [Member] | Contracts to Sell [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)	2,921	[1]	-19,946	[1]
ProShares Ultra Euro [Member] | Euro with Goldman Sachs International [Member] | Contracts to Purchase [Member]
Schedule of Investments [Line Items]
Settlement Date	9-Jan-15	[1]	10-Jan-14	[1]
Local Currency	2,080,425	[1]	2,652,025	[1]
Notional Amount at Value	2,517,638	[1]	3,648,635	[1]
Unrealized Appreciation (Depreciation)	-40,058	[1]	56,991	[1]
ProShares Ultra Euro [Member] | Euro with Goldman Sachs International [Member] | Contracts to Sell [Member]
Schedule of Investments [Line Items]
Settlement Date	9-Jan-15	[1]	10-Jan-14	[1]
Local Currency	-63,400	[1]	-1,918,800	[1]
Notional Amount at Value	-76,724	[1]	-2,639,870	[1]
Unrealized Appreciation (Depreciation)	1,202	[1]	-19,770	[1]
ProShares Ultra Euro [Member] | Euro with UBS AG [Member] | Contracts to Purchase [Member]
Schedule of Investments [Line Items]
Settlement Date	9-Jan-15	[1]	10-Jan-14	[1]
Local Currency	3,032,200	[1]	3,078,100	[1]
Notional Amount at Value	3,669,434	[1]	4,234,826	[1]
Unrealized Appreciation (Depreciation)	-66,234	[1]	63,917	[1]
ProShares Ultra Euro [Member] | Euro with UBS AG [Member] | Contracts to Sell [Member]
Schedule of Investments [Line Items]
Settlement Date	9-Jan-15	[1]	10-Jan-14	[1]
Local Currency	-122,500	[1]	-26,300	[1]
Notional Amount at Value	-148,244	[1]	-36,184	[1]
Unrealized Appreciation (Depreciation)	1,719	[1]	-176	[1]
ProShares Ultra Yen [Member] | Contracts to Purchase [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)	-15,148	[2]	-163,361	[1]
ProShares Ultra Yen [Member] | Contracts to Sell [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)	-97	[2]	4,052	[1]
ProShares Ultra Yen [Member] | Yen with Goldman Sachs International [Member] | Contracts to Purchase [Member]
Schedule of Investments [Line Items]
Settlement Date	9-Jan-15	[2]	10-Jan-14	[1]
Local Currency	229,660,300	[2]	296,968,900	[1]
Notional Amount at Value	1,917,715	[2]	2,820,656	[1]
Unrealized Appreciation (Depreciation)	-11,754	[2]	-78,309	[1]
ProShares Ultra Yen [Member] | Yen with Goldman Sachs International [Member] | Contracts to Sell [Member]
Schedule of Investments [Line Items]
Settlement Date	9-Jan-15	[2]	10-Jan-14	[1]
Local Currency	-9,518,600	[2]	-11,926,300	[1]
Notional Amount at Value	-79,482	[2]	-113,278	[1]
Unrealized Appreciation (Depreciation)	-501	[2]	2,462	[1]
ProShares Ultra Yen [Member] | Yen with UBS AG [Member] | Contracts to Purchase [Member]
Schedule of Investments [Line Items]
Settlement Date	9-Jan-15	[2]	10-Jan-14	[1]
Local Currency	304,204,900	[2]	321,381,200	[1]
Notional Amount at Value	2,540,179	[2]	3,052,527	[1]
Unrealized Appreciation (Depreciation)	-3,394	[2]	-85,052	[1]
ProShares Ultra Yen [Member] | Yen with UBS AG [Member] | Contracts to Sell [Member]
Schedule of Investments [Line Items]
Settlement Date	9-Jan-15	[2]	10-Jan-14	[1]
Local Currency	-16,144,000	[2]	-17,263,400	[1]
Notional Amount at Value	-134,806	[2]	-163,970	[1]
Unrealized Appreciation (Depreciation)	$404	[2]	$1,590	[1]
[1]	The positions and counterparties herein are as of December 31, 2013. The Funds continually evaluate different counterparties for their transactions and counterparties are subject to change. New counterparties can be added at any time.
[2]	The positions and counterparties herein are as of December 31, 2014. The Funds continually evaluate different counterparties for their transactions and counterparties are subject to change. New counterparties can be added at any time.

Organization_Additional_Inform

Organization - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014
	Trust
Organization [Line Items]
Number of series of Trust	22
Number of shares of each Leveraged Fund	14
Aggregate purchase price of each Leveraged Fund	$350
Period for expected multiple returns	1 day
ProShares UltraShort Bloomberg Commodity [Member]
Organization [Line Items]
Aggregate purchase price of each Leveraged Fund	350
ProShares UltraShort Bloomberg Crude Oil [Member]
Organization [Line Items]
Aggregate purchase price of each Leveraged Fund	350
ProShares UltraShort Gold [Member]
Organization [Line Items]
Aggregate purchase price of each Leveraged Fund	350
ProShares UltraShort Silver [Member]
Organization [Line Items]
Aggregate purchase price of each Leveraged Fund	350
ProShares UltraShort Euro [Member]
Organization [Line Items]
Aggregate purchase price of each Leveraged Fund	350
ProShares UltraShort Yen [Member]
Organization [Line Items]
Aggregate purchase price of each Leveraged Fund	350
ProShares Ultra Bloomberg Commodity [Member]
Organization [Line Items]
Aggregate purchase price of each Leveraged Fund	350
ProShares Ultra Bloomberg Crude Oil [Member]
Organization [Line Items]
Aggregate purchase price of each Leveraged Fund	350
ProShares Ultra Gold [Member]
Organization [Line Items]
Aggregate purchase price of each Leveraged Fund	350
ProShares Ultra Silver [Member]
Organization [Line Items]
Aggregate purchase price of each Leveraged Fund	350
ProShares Ultra Euro [Member]
Organization [Line Items]
Aggregate purchase price of each Leveraged Fund	350
ProShares Ultra Yen [Member]
Organization [Line Items]
Aggregate purchase price of each Leveraged Fund	$350

Organization_Schedule_of_Share

Organization - Schedule of Share Splits and Reverse Share Splits (Detail)	12 Months Ended
	Dec. 31, 2014
ProShares VIX Short-Term Futures ETF [Member] | June Ten Two Thousand Thirteen Reverse Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	10-Jun-13
Date Trading Resumed at Post- Split Price	10-Jun-13
Funds Reverse Split	1-for-5 reverse Share split
ProShares VIX Mid-Term Futures ETF [Member] | November Six Two Thousand Fourteen Reverse Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	6-Nov-14
Date Trading Resumed at Post- Split Price	6-Nov-14
Funds Reverse Split	1-for-4 reverse Share split
ProShares Short VIX Short-Term Futures ETF [Member] | October Five Two Thousand Twelve Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	5-Oct-12
Date Trading Resumed at Post- Split Price	5-Oct-12
Funds Split	2-for-1 Share split
ProShares Short VIX Short-Term Futures ETF [Member] | January Twenty One Two Thousand Fourteen Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	21-Jan-14
Date Trading Resumed at Post- Split Price	24-Jan-14
Funds Split	2-for-1 Share split
ProShares Ultra VIX Short-Term Futures ETF [Member] | June Ten Two Thousand Thirteen Reverse Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	10-Jun-13
Date Trading Resumed at Post- Split Price	10-Jun-13
Funds Reverse Split	1-for-10 reverse Share split
ProShares Ultra VIX Short-Term Futures ETF [Member] | March Eight Two Thousand Twelve Reverse Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	8-Mar-12
Date Trading Resumed at Post- Split Price	8-Mar-12
Funds Reverse Split	1-for-6 reverse Share split
ProShares Ultra VIX Short-Term Futures ETF [Member] | September Seven Two Thousand Twelve Reverse Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	7-Sep-12
Date Trading Resumed at Post- Split Price	7-Sep-12
Funds Reverse Split	1-for-10 reverse Share split
ProShares Ultra VIX Short-Term Futures ETF [Member] | January Twenty One Two Thousand Fourteen Reverse Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	21-Jan-14
Date Trading Resumed at Post- Split Price	24-Jan-14
Funds Reverse Split	1-for-4 reverse Share split
Proshares UltraShort Bloomberg Natural Gas [Member] | June Ten Two Thousand Thirteen Reverse Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	10-Jun-13
Date Trading Resumed at Post- Split Price	10-Jun-13
Funds Reverse Split	1-for-4 reverse Share split
Proshares UltraShort Bloomberg Natural Gas [Member] | May Eleven Two Thousand Twelve Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	11-May-12
Date Trading Resumed at Post- Split Price	11-May-12
Funds Split	3-for-1 Share split
ProShares UltraShort Gold [Member] | October Five Two Thousand Twelve Reverse Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	5-Oct-12
Date Trading Resumed at Post- Split Price	5-Oct-12
Funds Reverse Split	1-for-4 reverse Share split
ProShares UltraShort Silver [Member] | May Eleven Two Thousand Twelve Reverse Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	11-May-12
Date Trading Resumed at Post- Split Price	11-May-12
Funds Reverse Split	1-for-5 reverse Share split
Proshares Ultra Bloomberg Natural Gas [Member] | May Eleven Two Thousand Twelve Reverse Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	11-May-12
Date Trading Resumed at Post- Split Price	11-May-12
Funds Reverse Split	1-for-5 reverse Share split
ProShares Ultra Silver [Member] | January Twenty One Two Thousand Fourteen Reverse Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	21-Jan-14
Date Trading Resumed at Post- Split Price	24-Jan-14
Funds Reverse Split	1-for-4 reverse Share split

Significant_Accounting_Policie3

Significant Accounting Policies - Calculation of Funds' Final Net Asset Value for Creation and Redemption of Fund Shares (Detail)	12 Months Ended
	Dec. 31, 2014
ProShares UltraShort Silver [Member]
Net Asset Value [Line Items]
NAV Calculation Time	7:00 a.m.
NAV Calculation Date	31-Dec
ProShares Ultra Silver [Member]
Net Asset Value [Line Items]
NAV Calculation Time	7:00 a.m.
NAV Calculation Date	31-Dec
ProShares UltraShort Gold [Member]
Net Asset Value [Line Items]
NAV Calculation Time	10:00 a.m.
NAV Calculation Date	31-Dec
ProShares Ultra Gold [Member]
Net Asset Value [Line Items]
NAV Calculation Time	10:00 a.m.
NAV Calculation Date	31-Dec
ProShares UltraShort Bloomberg Crude Oil [Member]
Net Asset Value [Line Items]
NAV Calculation Time	2:30 p.m.
NAV Calculation Date	31-Dec
ProShares Ultra Bloomberg Crude Oil [Member]
Net Asset Value [Line Items]
NAV Calculation Time	2:30 p.m.
NAV Calculation Date	31-Dec
Proshares UltraShort Bloomberg Natural Gas [Member]
Net Asset Value [Line Items]
NAV Calculation Time	2:30 p.m.
NAV Calculation Date	31-Dec
Proshares Ultra Bloomberg Natural Gas [Member]
Net Asset Value [Line Items]
NAV Calculation Time	2:30 p.m.
NAV Calculation Date	31-Dec
ProShares UltraShort Bloomberg Commodity [Member]
Net Asset Value [Line Items]
NAV Calculation Time	2:30 p.m.	[1]
NAV Calculation Date	31-Dec
ProShares Ultra Bloomberg Commodity [Member]
Net Asset Value [Line Items]
NAV Calculation Time	2:30 p.m.	[1]
NAV Calculation Date	31-Dec
ProShares Managed Futures Strategy [Member]
Net Asset Value [Line Items]
NAV Calculation Time	3:00 p.m.
NAV Calculation Date	31-Dec
ProShares UltraShort Australian Dollar [Member]
Net Asset Value [Line Items]
NAV Calculation Time	4:00 p.m.
NAV Calculation Date	31-Dec
ProShares Ultra Australian Dollar [Member]
Net Asset Value [Line Items]
NAV Calculation Time	4:00 p.m.
NAV Calculation Date	31-Dec
ProShares Short Euro [Member]
Net Asset Value [Line Items]
NAV Calculation Time	4:00 p.m.
NAV Calculation Date	31-Dec
ProShares UltraShort Euro [Member]
Net Asset Value [Line Items]
NAV Calculation Time	4:00 p.m.
NAV Calculation Date	31-Dec
ProShares Ultra Euro [Member]
Net Asset Value [Line Items]
NAV Calculation Time	4:00 p.m.
NAV Calculation Date	31-Dec
ProShares UltraShort Yen [Member]
Net Asset Value [Line Items]
NAV Calculation Time	4:00 p.m.
NAV Calculation Date	31-Dec
ProShares Ultra Yen [Member]
Net Asset Value [Line Items]
NAV Calculation Time	4:00 p.m.
NAV Calculation Date	31-Dec
ProShares VIX Short-Term Futures ETF [Member]
Net Asset Value [Line Items]
NAV Calculation Time	4:15 p.m.
NAV Calculation Date	31-Dec
ProShares Short VIX Short-Term Futures ETF [Member]
Net Asset Value [Line Items]
NAV Calculation Time	4:15 p.m.
NAV Calculation Date	31-Dec
ProShares Ultra VIX Short-Term Futures ETF [Member]
Net Asset Value [Line Items]
NAV Calculation Time	4:15 p.m.
NAV Calculation Date	31-Dec
ProShares VIX Mid-Term Futures ETF [Member]
Net Asset Value [Line Items]
NAV Calculation Time	4:15 p.m.
NAV Calculation Date	31-Dec
[1]	On July 31, 2014, the NAV Calculation Time for the Bloomberg Commodity Index was changed from 3:00 p.m. to 2:30 p.m

Significant_Accounting_Policie4

Significant Accounting Policies - Calculation of Funds' Final Net Asset Value for Creation and Redemption of Fund Shares (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2014
ProShares UltraShort Bloomberg Commodity [Member]
Net Asset Value [Line Items]
Change in NAV Calculation Time, description	On July 31, 2014, the NAV Calculation Time for the Bloomberg Commodity Index was changed from 3:00 p.m. to 2:30 p.m
ProShares Ultra Bloomberg Commodity [Member]
Net Asset Value [Line Items]
Change in NAV Calculation Time, description	On July 31, 2014, the NAV Calculation Time for the Bloomberg Commodity Index was changed from 3:00 p.m. to 2:30 p.m

Significant_Accounting_Policie5

Significant Accounting Policies - Valuation of Investments using Fair Value Hierarchy (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
ProShares Managed Futures Strategy [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	$104,327
ProShares VIX Short-Term Futures ETF [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	88,352,919	190,983,697
ProShares VIX Mid-Term Futures ETF [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	24,366,571	41,143,544
ProShares Short VIX Short-Term Futures ETF [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	430,623,071	113,675,977
ProShares Ultra VIX Short-Term Futures ETF [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	222,224,441	85,523,576
ProShares UltraShort Bloomberg Commodity [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	4,800,807	3,426,225
ProShares UltraShort Bloomberg Crude Oil [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	174,419,288	244,018,950
Proshares UltraShort Bloomberg Natural Gas [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	12,614,175	19,317,013
ProShares UltraShort Gold [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	81,752,809	154,635,902
ProShares UltraShort Silver [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	52,823,205	112,612,409
ProShares Short Euro [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	12,471,908	7,868,825
ProShares UltraShort Australian Dollar [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	21,011,160	25,116,112
ProShares UltraShort Euro [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	503,874,111	424,098,652
ProShares UltraShort Yen [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	531,378,971	587,983,948
ProShares Ultra Bloomberg Commodity [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	2,423,562	2,831,766
ProShares Ultra Bloomberg Crude Oil [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	344,544,852	140,020,164
Proshares Ultra Bloomberg Natural Gas [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	18,520,944	55,264,472
ProShares Ultra Gold [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	103,983,591	134,053,416
ProShares Ultra Silver [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	293,077,531	465,361,896
ProShares Ultra Australian Dollar [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	2,308,860	2,598,219
ProShares Ultra Euro [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	2,312,327	2,556,825
ProShares Ultra Yen [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	1,272,624	2,769,247
Total Trust [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	2,929,262,054	2,815,860,835
Level I - Quoted Prices [Member] | ProShares Managed Futures Strategy [Member] | VIX Futures Contracts [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	104,327
Level I - Quoted Prices [Member] | ProShares VIX Short-Term Futures ETF [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	82,088,299	207,636,383
Level I - Quoted Prices [Member] | ProShares VIX Short-Term Futures ETF [Member] | VIX Futures Contracts [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	6,264,620	-16,652,686
Level I - Quoted Prices [Member] | ProShares VIX Mid-Term Futures ETF [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	24,105,906	46,040,233
Level I - Quoted Prices [Member] | ProShares VIX Mid-Term Futures ETF [Member] | VIX Futures Contracts [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	260,665	-4,896,689
Level I - Quoted Prices [Member] | ProShares Short VIX Short-Term Futures ETF [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	446,975,220	105,559,022
Level I - Quoted Prices [Member] | ProShares Short VIX Short-Term Futures ETF [Member] | VIX Futures Contracts [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	-16,352,149	8,116,955
Level I - Quoted Prices [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	182,639,188	109,533,487
Level I - Quoted Prices [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member] | VIX Futures Contracts [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	39,585,253	-24,009,911
Level I - Quoted Prices [Member] | ProShares UltraShort Bloomberg Commodity [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	4,233,548	3,453,890
Level I - Quoted Prices [Member] | ProShares UltraShort Bloomberg Crude Oil [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	131,594,608	247,584,623
Level I - Quoted Prices [Member] | ProShares UltraShort Bloomberg Crude Oil [Member] | VIX Futures Contracts [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	15,806,603	-1,232,773
Level I - Quoted Prices [Member] | Proshares UltraShort Bloomberg Natural Gas [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	8,672,710	18,274,713
Level I - Quoted Prices [Member] | Proshares UltraShort Bloomberg Natural Gas [Member] | VIX Futures Contracts [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	3,941,465	1,042,300
Level I - Quoted Prices [Member] | ProShares UltraShort Gold [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	84,040,107	148,988,329
Level I - Quoted Prices [Member] | ProShares UltraShort Gold [Member] | VIX Futures Contracts [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	-4,520	14,520
Level I - Quoted Prices [Member] | ProShares UltraShort Silver [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	52,226,692	114,826,066
Level I - Quoted Prices [Member] | ProShares UltraShort Silver [Member] | VIX Futures Contracts [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	1,560	14,200
Level I - Quoted Prices [Member] | ProShares Short Euro [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	12,086,577	7,902,056
Level I - Quoted Prices [Member] | ProShares Short Euro [Member] | VIX Futures Contracts [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	385,331	-33,231
Level I - Quoted Prices [Member] | ProShares UltraShort Australian Dollar [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	20,267,679	24,198,507
Level I - Quoted Prices [Member] | ProShares UltraShort Australian Dollar [Member] | VIX Futures Contracts [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	743,481	917,605
Level I - Quoted Prices [Member] | ProShares UltraShort Euro [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	487,111,117	437,847,159
Level I - Quoted Prices [Member] | ProShares UltraShort Yen [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	532,957,746	558,597,264
Level I - Quoted Prices [Member] | ProShares Ultra Bloomberg Commodity [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	2,754,900	2,816,688
Level I - Quoted Prices [Member] | ProShares Ultra Bloomberg Crude Oil [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	467,200,736	137,435,610
Level I - Quoted Prices [Member] | ProShares Ultra Bloomberg Crude Oil [Member] | VIX Futures Contracts [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	-46,474,787	626,661
Level I - Quoted Prices [Member] | Proshares Ultra Bloomberg Natural Gas [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	53,410,227	58,921,011
Level I - Quoted Prices [Member] | Proshares Ultra Bloomberg Natural Gas [Member] | VIX Futures Contracts [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	-34,889,283	-3,656,539
Level I - Quoted Prices [Member] | ProShares Ultra Gold [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	101,927,857	140,880,950
Level I - Quoted Prices [Member] | ProShares Ultra Gold [Member] | VIX Futures Contracts [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	4,580	-14,560
Level I - Quoted Prices [Member] | ProShares Ultra Silver [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	305,474,211	467,868,976
Level I - Quoted Prices [Member] | ProShares Ultra Silver [Member] | VIX Futures Contracts [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	-1,560	-14,200
Level I - Quoted Prices [Member] | ProShares Ultra Australian Dollar [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	2,405,685	2,716,439
Level I - Quoted Prices [Member] | ProShares Ultra Australian Dollar [Member] | VIX Futures Contracts [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	-96,825	-118,220
Level I - Quoted Prices [Member] | ProShares Ultra Euro [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	2,415,698	2,455,863
Level I - Quoted Prices [Member] | ProShares Ultra Yen [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	1,287,869	2,928,556
Level I - Quoted Prices [Member] | Total Trust [Member] | Short-Term U.S. Government and Agencies [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	3,005,876,580	2,846,465,825
Level I - Quoted Prices [Member] | Total Trust [Member] | VIX Futures Contracts [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	-30,721,239	-39,896,568
Level II - Other Significant Observable Inputs [Member] | ProShares UltraShort Bloomberg Commodity [Member] | Swap Agreements [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	567,259	-27,665
Level II - Other Significant Observable Inputs [Member] | ProShares UltraShort Bloomberg Crude Oil [Member] | Swap Agreements [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	27,018,077	-2,332,900
Level II - Other Significant Observable Inputs [Member] | ProShares UltraShort Gold [Member] | Forward Agreements [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	-2,282,778	5,633,053
Level II - Other Significant Observable Inputs [Member] | ProShares UltraShort Silver [Member] | Forward Agreements [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	594,953	-2,227,857
Level II - Other Significant Observable Inputs [Member] | ProShares UltraShort Euro [Member] | Foreign Currency Forward Contracts [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	16,762,994	-13,748,507
Level II - Other Significant Observable Inputs [Member] | ProShares UltraShort Yen [Member] | Foreign Currency Forward Contracts [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	-1,578,775	29,386,684
Level II - Other Significant Observable Inputs [Member] | ProShares Ultra Bloomberg Commodity [Member] | Swap Agreements [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	-331,338	15,078
Level II - Other Significant Observable Inputs [Member] | ProShares Ultra Bloomberg Crude Oil [Member] | Swap Agreements [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	-76,181,097	1,957,893
Level II - Other Significant Observable Inputs [Member] | ProShares Ultra Gold [Member] | Forward Agreements [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	2,051,154	-6,812,974
Level II - Other Significant Observable Inputs [Member] | ProShares Ultra Silver [Member] | Forward Agreements [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	-12,395,120	-2,492,880
Level II - Other Significant Observable Inputs [Member] | ProShares Ultra Euro [Member] | Foreign Currency Forward Contracts [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	-103,371	100,962
Level II - Other Significant Observable Inputs [Member] | ProShares Ultra Yen [Member] | Foreign Currency Forward Contracts [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	-15,245	-159,309
Level II - Other Significant Observable Inputs [Member] | Total Trust [Member] | Forward Agreements [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	-12,031,791	-5,900,658
Level II - Other Significant Observable Inputs [Member] | Total Trust [Member] | Foreign Currency Forward Contracts [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	15,065,603	15,579,830
Level II - Other Significant Observable Inputs [Member] | Total Trust [Member] | Swap Agreements [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, fair value disclosure	($48,927,099)	($387,594)

Significant_Accounting_Policie6

Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended		0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Jul. 31, 2014
Significant Accounting Policies [Line Items]
Level III portfolio investments	$0	$0
Minimum [Member] | Volatility Index Fund [Member]
Significant Accounting Policies [Line Items]
Percentage of brokerage commissions exceed variable create/redeem fees			0.02%

Investments_Fair_Value_of_Deri

Investments - Fair Value of Derivative Instruments (Detail) (USD $)	Dec. 31, 2014		Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset not designated as hedging instrument, Unrealized Appreciation	$117,369,486	[1]	$49,932,144	[1]
Derivative liability not designated as hedging instrument, Unrealized Depreciation	193,984,012	[1]	80,537,134	[1]
Managed Futures Contracts [Member] | Payable on Open Futures Contracts [Member] | ProShares Managed Futures Strategy [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability not designated as hedging instrument, Unrealized Depreciation	18,504	[1]
Managed Futures Contracts [Member] | Receivables on Open Futures Contracts [Member] | ProShares Managed Futures Strategy [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset not designated as hedging instrument, Unrealized Appreciation	122,831	[1]
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 designated as hedging instrument, Unrealized Depreciation	222,845	[1]	4,896,689	[1]
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 designated as hedging instrument, Unrealized Depreciation	16,352,149	[1]
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 designated as hedging instrument, Unrealized Depreciation			16,652,686	[1]
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 designated as hedging instrument, Unrealized Depreciation			24,009,911	[1]
VIX Futures Contracts [Member] | Receivables on Open Futures Contracts [Member] | ProShares VIX Mid-Term Futures ETF [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset not designated as hedging instrument, Unrealized Appreciation	483,510	[1]
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	6,264,620	[1]	8,116,955	[1]
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	39,585,253	[1]
Commodity Contracts [Member] | Payable on Open Futures Contracts, Unrealized Depreciation on Swap and/or Forward Agreements [Member] | ProShares UltraShort Gold [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability not designated as hedging instrument, Unrealized Depreciation	2,287,298	[1]
Commodity Contracts [Member] | Payable on Open Futures Contracts, Unrealized Depreciation on Swap and/or Forward Agreements [Member] | ProShares UltraShort Silver [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability not designated as hedging instrument, Unrealized Depreciation	204,570		2,227,857
Commodity Contracts [Member] | Payable on Open Futures Contracts, Unrealized Depreciation on Swap and/or Forward Agreements [Member] | ProShares Ultra Bloomberg Commodity [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability not designated as hedging instrument, Unrealized Depreciation	331,338
Commodity Contracts [Member] | Payable on Open Futures Contracts, Unrealized Depreciation on Swap and/or Forward Agreements [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability not designated as hedging instrument, Unrealized Depreciation	122,655,884	[1]
Commodity Contracts [Member] | Payable on Open Futures Contracts, Unrealized Depreciation on Swap and/or Forward Agreements [Member] | Proshares Ultra Bloomberg Natural Gas [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability not designated as hedging instrument, Unrealized Depreciation	34,889,283	[1]	3,656,539	[1]
Commodity Contracts [Member] | Payable on Open Futures Contracts, Unrealized Depreciation on Swap and/or Forward Agreements [Member] | ProShares Ultra Silver [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability not designated as hedging instrument, Unrealized Depreciation	12,396,680	[1]	2,507,080	[1]
Commodity Contracts [Member] | Payable on Open Futures Contracts, Unrealized Depreciation on Swap and/or Forward Agreements [Member] | ProShares UltraShort Bloomberg Commodity [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability not designated as hedging instrument, Unrealized Depreciation			27,665
Commodity Contracts [Member] | Payable on Open Futures Contracts, Unrealized Depreciation on Swap and/or Forward Agreements [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability not designated as hedging instrument, Unrealized Depreciation			3,565,673	[1]
Commodity Contracts [Member] | Payable on Open Futures Contracts, Unrealized Depreciation on Swap and/or Forward Agreements [Member] | ProShares Ultra Gold [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability not designated as hedging instrument, Unrealized Depreciation			6,827,534	[1]
Commodity Contracts [Member] | Receivables on Open Futures Contracts, Unrealized Appreciation on Swap and/ or Forwards Agreements [Member] | ProShares UltraShort Gold [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset not designated as hedging instrument, Unrealized Appreciation			5,647,573	[1]
Commodity Contracts [Member] | Receivables on Open Futures Contracts, Unrealized Appreciation on Swap and/ or Forwards Agreements [Member] | ProShares UltraShort Silver [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset not designated as hedging instrument, Unrealized Appreciation	801,083	[1]	14,200	[1]
Commodity Contracts [Member] | Receivables on Open Futures Contracts, Unrealized Appreciation on Swap and/ or Forwards Agreements [Member] | ProShares Ultra Bloomberg Commodity [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset not designated as hedging instrument, Unrealized Appreciation			15,078	[1]
Commodity Contracts [Member] | Receivables on Open Futures Contracts, Unrealized Appreciation on Swap 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			2,584,554	[1]
Commodity Contracts [Member] | Receivables on Open Futures Contracts, Unrealized Appreciation on Swap and/ or Forwards Agreements [Member] | ProShares UltraShort Bloomberg Commodity [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset not designated as hedging instrument, Unrealized Appreciation	567,259	[1]
Commodity Contracts [Member] | Receivables on Open Futures Contracts, Unrealized Appreciation on Swap 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	42,824,680	[1]
Commodity Contracts [Member] | Receivables on Open Futures Contracts, Unrealized Appreciation on Swap 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	3,941,465	[1]	1,042,300	[1]
Commodity Contracts [Member] | Receivables on Open Futures Contracts, Unrealized Appreciation on Swap and/ or Forwards Agreements [Member] | ProShares Ultra Gold [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset not designated as hedging instrument, Unrealized Appreciation	2,055,734	[1]
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 designated as hedging instrument, Unrealized Depreciation	2,256,771		13,899,858
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 designated as hedging instrument, Unrealized Depreciation	2,149,924		1,930,884
Foreign Exchange Contracts [Member] | Unrealized Depreciation on Foreign Currency Forward Contracts and Payable on Open Futures Contracts [Member] | ProShares Ultra Australian Dollar [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability not designated as hedging instrument, Unrealized Depreciation	96,825	[1]	118,220	[1]
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 designated as hedging instrument, Unrealized Depreciation	106,292		19,946
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 designated as hedging instrument, Unrealized Depreciation	15,649		163,361
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 designated as hedging instrument, Unrealized Depreciation			33,231	[1]
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	19,019,765		151,351
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	571,149		31,317,568
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	2,921		120,908
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	404		4,052
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	385,331	[1]
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	$743,481	[1]	$917,605	[1]
[1]	Includes cumulative appreciation/depreciation of futures contracts as reported in the Schedules of Investments. Only current day's variation margin is reported within the Statements of Financial Condition in receivable/payable on open futures contracts.

Investments_Effect_of_Derivati

Investments - Effect of Derivative Instruments on Statements of Operations (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain or (Loss) on Derivatives Recognized in Income	($160,673,640)	($921,587,308)	($835,413,491)
Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income	-46,009,536	41,888,186	65,024,035
Managed Futures Contracts [Member] | Net Realized Gain (Loss) on Futures Contracts/ Changes in Unrealized Appreciation/ Depreciation on Futures Contracts [Member] | ProShares Managed Futures Strategy [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain or (Loss) on Derivatives Recognized in Income	109,006
Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income	104,327
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 or (Loss) on Derivatives Recognized in Income	-694,347	-144,618,136	-160,953,587
Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income	22,917,306	-16,431,267	1,354,551
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 or (Loss) on Derivatives Recognized in Income	-14,378,810	-28,219,863	-75,241,919
Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income	5,157,354	-3,426,279	4,642,340
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 or (Loss) on Derivatives Recognized in Income	76,925,998	87,175,105	13,203,419
Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income	-24,469,104	9,504,130	-1,477,355
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 or (Loss) on Derivatives Recognized in Income	-139,412,525	-405,816,676	-509,421,864
Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income	63,595,164	-26,368,324	3,121,203
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 Commodity [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain or (Loss) on Derivatives Recognized in Income	906,309	760,002	761,879
Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income	594,924	-176,167	-422,249
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 or (Loss) on Derivatives Recognized in Income	99,327,097	-12,304,999	47,564,763
Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income	46,390,353	6,071,108	-12,529,061
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 or (Loss) on Derivatives Recognized in Income	8,791,719	-2,585,514	1,212,600
Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income	2,899,165	633,165	-971,875
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 or (Loss) on Derivatives Recognized in Income	-5,316,482	61,124,409	-10,067,498
Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income	-7,934,871	1,902,477	-29,698,062
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 or (Loss) on Derivatives Recognized in Income	15,114,883	113,456,404	-28,114,972
Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income	2,810,170	-21,561,362	-23,728,868
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 Commodity [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain or (Loss) on Derivatives Recognized in Income	-1,065,622	-1,254,251	-536,107
Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income	-346,416	321,346	400,909
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 or (Loss) on Derivatives Recognized in Income	-243,325,957	120,745,948	-84,061,967
Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income	-125,240,438	-52,709,476	66,666,756
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 or (Loss) on Derivatives Recognized in Income	-6,464,796	41,418,165	-2,839,309
Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income	-31,232,744	160,411	-2,991,440
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 or (Loss) on Derivatives Recognized in Income	-9,674,333	-165,632,786	-33,592,896
Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income	8,883,268	8,839,764	65,210,642
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 or (Loss) on Derivatives Recognized in Income	-155,551,420	-701,532,729	-66,426,492
Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income	-9,889,600	143,273,646	33,606,897
Foreign Exchange Contracts [Member] | Net Realized Gain (Loss) on Foreign Currency Forward Contracts/ Changes in Unrealized Appreciation/ Depreciation on Foreign Currency Forward Contracts [Member] | ProShares Short Euro [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain or (Loss) on Derivatives Recognized in Income	1,593,048	-381,987	-164,400
Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income	418,562	21,825	-55,056
Foreign Exchange Contracts [Member] | Net Realized Gain (Loss) on Foreign Currency Forward Contracts/ Changes in Unrealized Appreciation/ Depreciation on Foreign Currency Forward Contracts [Member] | ProShares UltraShort Australian Dollar [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain or (Loss) on Derivatives Recognized in Income	2,296,216	2,720,079	-288,740
Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income	-174,124	832,015	85,590
Foreign Exchange Contracts [Member] | Net Realized Gain (Loss) on Foreign Currency Forward Contracts/ Changes in Unrealized Appreciation/ Depreciation on Foreign Currency Forward Contracts [Member] | ProShares UltraShort Euro [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain or (Loss) on Derivatives Recognized in Income	83,678,955	-48,063,036	46,946,419
Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income	30,511,501	-600,935	-80,578,526
Foreign Exchange Contracts [Member] | Net Realized Gain (Loss) on Foreign Currency Forward Contracts/ Changes in Unrealized Appreciation/ Depreciation on Foreign Currency Forward Contracts [Member] | ProShares UltraShort Yen [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain or (Loss) on Derivatives Recognized in Income	127,846,225	164,019,598	27,341,631
Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income	-30,965,459	-8,727,491	42,478,321
Foreign Exchange Contracts [Member] | Net Realized Gain (Loss) on Foreign Currency Forward Contracts/ Changes in Unrealized Appreciation/ Depreciation on Foreign Currency Forward Contracts [Member] | ProShares Ultra Australian Dollar [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain or (Loss) on Derivatives Recognized in Income	-417,873	-928,022	265,990
Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income	21,395	-19,190	-99,030
Foreign Exchange Contracts [Member] | Net Realized Gain (Loss) on Foreign Currency Forward Contracts/ Changes in Unrealized Appreciation/ Depreciation on Foreign Currency Forward Contracts [Member] | ProShares Ultra Euro [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain or (Loss) on Derivatives Recognized in Income	-420,533	210,150	-398,504
Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income	-204,333	13,803	605,371
Foreign Exchange Contracts [Member] | Net Realized Gain (Loss) on Foreign Currency Forward Contracts/ Changes in Unrealized Appreciation/ Depreciation on Foreign Currency Forward Contracts [Member] | ProShares Ultra Yen [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain or (Loss) on Derivatives Recognized in Income	-540,398	-1,879,169	-601,937
Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income	$144,064	$334,987	($597,023)

Investments_Offsetting_of_Fina

Investments - Offsetting of Financial Assets and Liabilities (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
ProShares UltraShort Bloomberg Commodity [Member] | Swap Agreements [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets presented in the Statements of Financial Condition	$567,259
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amount	567,259
Gross Amounts of Recognized Liabilities presented in the Statements of Financial Condition		27,665
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Liabilities presented in the Statements of Financial Condition		27,665
ProShares UltraShort Bloomberg Crude Oil [Member] | Swap Agreements [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets presented in the Statements of Financial Condition	27,018,077
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amount	27,018,077
Gross Amounts of Recognized Liabilities presented in the Statements of Financial Condition		2,332,900
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Liabilities presented in the Statements of Financial Condition		2,332,900
ProShares UltraShort Gold [Member] | Forward Agreements [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets presented in the Statements of Financial Condition		5,633,053
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amount		5,633,053
Gross Amounts of Recognized Liabilities presented in the Statements of Financial Condition	2,282,778
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Liabilities presented in the Statements of Financial Condition	2,282,778
ProShares UltraShort Silver [Member] | Forward Agreements [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets presented in the Statements of Financial Condition	799,523
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amount	799,523
Gross Amounts of Recognized Liabilities presented in the Statements of Financial Condition	204,570	2,227,857
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Liabilities presented in the Statements of Financial Condition	204,570	2,227,857
ProShares UltraShort Euro [Member] | Foreign Currency Forward Contracts [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets presented in the Statements of Financial Condition	19,019,765	151,351
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amount	19,019,765	151,351
Gross Amounts of Recognized Liabilities presented in the Statements of Financial Condition	2,256,771	13,899,858
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Liabilities presented in the Statements of Financial Condition	2,256,771	13,899,858
ProShares UltraShort Yen [Member] | Foreign Currency Forward Contracts [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets presented in the Statements of Financial Condition	571,149	31,317,568
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amount	571,149	31,317,568
Gross Amounts of Recognized Liabilities presented in the Statements of Financial Condition	2,149,924	1,930,884
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Liabilities presented in the Statements of Financial Condition	2,149,924	1,930,884
ProShares Ultra Bloomberg Commodity [Member] | Swap Agreements [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets presented in the Statements of Financial Condition		15,078
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amount		15,078
Gross Amounts of Recognized Liabilities presented in the Statements of Financial Condition	331,338
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Liabilities presented in the Statements of Financial Condition	331,338
ProShares Ultra Bloomberg Crude Oil [Member] | Swap Agreements [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets presented in the Statements of Financial Condition		1,957,893
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amount		1,957,893
Gross Amounts of Recognized Liabilities presented in the Statements of Financial Condition	76,181,097
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Liabilities presented in the Statements of Financial Condition	76,181,097
ProShares Ultra Gold [Member] | Forward Agreements [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets presented in the Statements of Financial Condition	2,051,154
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amount	2,051,154
Gross Amounts of Recognized Liabilities presented in the Statements of Financial Condition		6,812,974
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Liabilities presented in the Statements of Financial Condition		6,812,974
ProShares Ultra 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	12,395,120	2,492,880
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Liabilities presented in the Statements of Financial Condition	12,395,120	2,492,880
ProShares Ultra Euro [Member] | Foreign Currency Forward Contracts [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets presented in the Statements of Financial Condition	2,921	120,908
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amount	2,921	120,908
Gross Amounts of Recognized Liabilities presented in the Statements of Financial Condition	106,292	19,946
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Liabilities presented in the Statements of Financial Condition	106,292	19,946
ProShares Ultra Yen [Member] | Foreign Currency Forward Contracts [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets presented in the Statements of Financial Condition	404	4,052
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amount	404	4,052
Gross Amounts of Recognized Liabilities presented in the Statements of Financial Condition	15,649	163,361
Gross Amounts Offset in the Statements of Financial Condition	0	0
Net Amounts of Liabilities presented in the Statements of Financial Condition	$15,649	$163,361

Investments_Gross_Amounts_Not_

Investments - Gross Amounts Not Offset in the Statement of Financial Condition (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
ProShares UltraShort Bloomberg Commodity [Member] | Deutsche Bank AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	$243,474
Financial Instruments for the Funds /the Counterparties	0
Cash Collateral for the Funds / the Counterparties	0
Net Amount	243,474
Amounts of Recognized Liabilities presented in the Statements of Financial Condition		-11,710
Financial Instruments for the Benefit of /the Counterparties		11,710
Cash Collateral for the Benefit of / the Counterparties		0
Net Amount		0
ProShares UltraShort Bloomberg Commodity [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	240,271
Financial Instruments for the Funds /the Counterparties	0
Cash Collateral for the Funds / the Counterparties	0
Net Amount	240,271
Amounts of Recognized Liabilities presented in the Statements of Financial Condition		-12,945
Financial Instruments for the Benefit of /the Counterparties		12,945
Cash Collateral for the Benefit of / the Counterparties		0
Net Amount		0
ProShares UltraShort Bloomberg Commodity [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	83,514
Financial Instruments for the Funds /the Counterparties	0
Cash Collateral for the Funds / the Counterparties	0
Net Amount	83,514
Amounts of Recognized Liabilities presented in the Statements of Financial Condition		-3,010
Financial Instruments for the Benefit of /the Counterparties		3,010
Cash Collateral for the Benefit of / the Counterparties		0
Net Amount		0
ProShares UltraShort Bloomberg Crude Oil [Member] | Deutsche Bank AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	7,669,493
Financial Instruments for the Funds /the Counterparties	0
Cash Collateral for the Funds / the Counterparties	-6,800,000
Net Amount	869,493
Amounts of Recognized Liabilities presented in the Statements of Financial Condition		-570,114
Financial Instruments for the Benefit of /the Counterparties		570,114
Cash Collateral for the Benefit of / the Counterparties		0
Net Amount		0
ProShares UltraShort Bloomberg Crude Oil [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	8,362,336
Financial Instruments for the Funds /the Counterparties	-7,598,657
Cash Collateral for the Funds / the Counterparties	0
Net Amount	763,679
Amounts of Recognized Liabilities presented in the Statements of Financial Condition		-632,990
Financial Instruments for the Benefit of /the Counterparties		632,990
Cash Collateral for the Benefit of / the Counterparties		0
Net Amount		0
ProShares UltraShort Bloomberg Crude Oil [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	8,853,591
Financial Instruments for the Funds /the Counterparties	-8,281,350
Cash Collateral for the Funds / the Counterparties	0
Net Amount	572,241
Amounts of Recognized Liabilities presented in the Statements of Financial Condition		-727,210
Financial Instruments for the Benefit of /the Counterparties		727,210
Cash Collateral for the Benefit of / the Counterparties		0
Net Amount		0
ProShares UltraShort Bloomberg Crude Oil [Member] | Societe Generale S.A. [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	2,132,657
Financial Instruments for the Funds /the Counterparties	-2,132,657
Cash Collateral for the Funds / the Counterparties	0
Net Amount	0
Amounts of Recognized Liabilities presented in the Statements of Financial Condition		-402,586
Financial Instruments for the Benefit of /the Counterparties		402,586
Cash Collateral for the Benefit of / the Counterparties		0
Net Amount		0
ProShares UltraShort Gold [Member] | Deutsche Bank AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition		2,258,281
Financial Instruments for the Funds /the Counterparties		0
Cash Collateral for the Funds / the Counterparties		-2,258,281
Net Amount		0
Amounts of Recognized Liabilities presented in the Statements of Financial Condition	-1,422,997
Financial Instruments for the Benefit of /the Counterparties	1,422,997
Cash Collateral for the Benefit of / the Counterparties	0
Net Amount	0
ProShares UltraShort Gold [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition		1,411,290
Financial Instruments for the Funds /the Counterparties		-1,411,290
Cash Collateral for the Funds / the Counterparties		0
Net Amount		0
Amounts of Recognized Liabilities presented in the Statements of Financial Condition	-354,660
Financial Instruments for the Benefit of /the Counterparties	354,660
Cash Collateral for the Benefit of / the Counterparties	0
Net Amount	0
ProShares UltraShort Gold [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition		1,298,438
Financial Instruments for the Funds /the Counterparties		-1,298,438
Cash Collateral for the Funds / the Counterparties		0
Net Amount		0
Amounts of Recognized Liabilities presented in the Statements of Financial Condition	-322,896
Financial Instruments for the Benefit of /the Counterparties	322,896
Cash Collateral for the Benefit of / the Counterparties	0
Net Amount	0
ProShares UltraShort Gold [Member] | Societe Generale S.A. [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition		665,044
Financial Instruments for the Funds /the Counterparties		-665,044
Cash Collateral for the Funds / the Counterparties		0
Net Amount		0
Amounts of Recognized Liabilities presented in the Statements of Financial Condition	-182,225
Financial Instruments for the Benefit of /the Counterparties	182,225
Cash Collateral for the Benefit of / the Counterparties	0
Net Amount	0
ProShares UltraShort Silver [Member] | Deutsche Bank AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	462,619
Financial Instruments for the Funds /the Counterparties	0
Cash Collateral for the Funds / the Counterparties	-462,619
Net Amount	0
Amounts of Recognized Liabilities presented in the Statements of Financial Condition		-445,752
Financial Instruments for the Benefit of /the Counterparties		445,752
Cash Collateral for the Benefit of / the Counterparties		0
Net Amount		0
ProShares UltraShort Silver [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	138,563
Financial Instruments for the Funds /the Counterparties	-138,563
Cash Collateral for the Funds / the Counterparties	0
Net Amount	0
Amounts of Recognized Liabilities presented in the Statements of Financial Condition		-1,257,636
Financial Instruments for the Benefit of /the Counterparties		1,257,636
Cash Collateral for the Benefit of / the Counterparties		0
Net Amount		0
ProShares UltraShort Silver [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Liabilities presented in the Statements of Financial Condition	-204,570	-517,110
Financial Instruments for the Benefit of /the Counterparties	204,570	517,110
Cash Collateral for the Benefit of / the Counterparties	0	0
Net Amount	0	0
ProShares UltraShort Silver [Member] | Societe Generale S.A. [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	198,341
Financial Instruments for the Funds /the Counterparties	-198,341
Cash Collateral for the Funds / the Counterparties	0
Net Amount	0
Amounts of Recognized Liabilities presented in the Statements of Financial Condition		-7,359
Financial Instruments for the Benefit of /the Counterparties		7,359
Cash Collateral for the Benefit of / the Counterparties		0
Net Amount		0
ProShares UltraShort Euro [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	8,193,303
Financial Instruments for the Funds /the Counterparties	-6,008,925
Cash Collateral for the Funds / the Counterparties	0
Net Amount	2,184,378
Amounts of Recognized Liabilities presented in the Statements of Financial Condition		-6,756,698
Financial Instruments for the Benefit of /the Counterparties		6,756,698
Cash Collateral for the Benefit of / the Counterparties		0
Net Amount		0
ProShares UltraShort Euro [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	8,569,691
Financial Instruments for the Funds /the Counterparties	-6,592,366
Cash Collateral for the Funds / the Counterparties	-11,518
Net Amount	1,965,807
Amounts of Recognized Liabilities presented in the Statements of Financial Condition		-6,991,809
Financial Instruments for the Benefit of /the Counterparties		6,991,809
Cash Collateral for the Benefit of / the Counterparties		0
Net Amount		0
ProShares UltraShort Yen [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition		14,831,469
Financial Instruments for the Funds /the Counterparties		-12,750,577
Cash Collateral for the Funds / the Counterparties		0
Net Amount		2,080,892
Amounts of Recognized Liabilities presented in the Statements of Financial Condition	-1,466,239
Financial Instruments for the Benefit of /the Counterparties	1,466,239
Cash Collateral for the Benefit of / the Counterparties	0
Net Amount	0
ProShares UltraShort Yen [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition		14,555,215
Financial Instruments for the Funds /the Counterparties		-12,958,891
Cash Collateral for the Funds / the Counterparties		0
Net Amount		1,596,324
Amounts of Recognized Liabilities presented in the Statements of Financial Condition	-112,536
Financial Instruments for the Benefit of /the Counterparties	112,536
Cash Collateral for the Benefit of / the Counterparties	0
Net Amount	0
ProShares Ultra Bloomberg Commodity [Member] | Deutsche Bank AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition		6,454
Financial Instruments for the Funds /the Counterparties		0
Cash Collateral for the Funds / the Counterparties		0
Net Amount		6,454
Amounts of Recognized Liabilities presented in the Statements of Financial Condition	-143,751
Financial Instruments for the Benefit of /the Counterparties	143,751
Cash Collateral for the Benefit of / the Counterparties	0
Net Amount	0
ProShares Ultra Bloomberg Commodity [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition		4,974
Financial Instruments for the Funds /the Counterparties		0
Cash Collateral for the Funds / the Counterparties		0
Net Amount		4,974
Amounts of Recognized Liabilities presented in the Statements of Financial Condition	-138,532
Financial Instruments for the Benefit of /the Counterparties	138,532
Cash Collateral for the Benefit of / the Counterparties	0
Net Amount	0
ProShares Ultra Bloomberg Commodity [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition		3,650
Financial Instruments for the Funds /the Counterparties		0
Cash Collateral for the Funds / the Counterparties		0
Net Amount		3,650
Amounts of Recognized Liabilities presented in the Statements of Financial Condition	-49,055
Financial Instruments for the Benefit of /the Counterparties	49,055
Cash Collateral for the Benefit of / the Counterparties	0
Net Amount	0
ProShares Ultra Bloomberg Crude Oil [Member] | Deutsche Bank AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition		622,117
Financial Instruments for the Funds /the Counterparties		0
Cash Collateral for the Funds / the Counterparties		-622,117
Net Amount		0
Amounts of Recognized Liabilities presented in the Statements of Financial Condition	-24,223,667
Financial Instruments for the Benefit of /the Counterparties	24,223,667
Cash Collateral for the Benefit of / the Counterparties	0
Net Amount	0
ProShares Ultra Bloomberg Crude Oil [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition		576,723
Financial Instruments for the Funds /the Counterparties		-576,723
Cash Collateral for the Funds / the Counterparties		0
Net Amount		0
Amounts of Recognized Liabilities presented in the Statements of Financial Condition	-24,285,701
Financial Instruments for the Benefit of /the Counterparties	24,285,701
Cash Collateral for the Benefit of / the Counterparties	0
Net Amount	0
ProShares Ultra Bloomberg Crude Oil [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition		483,237
Financial Instruments for the Funds /the Counterparties		-483,237
Cash Collateral for the Funds / the Counterparties		0
Net Amount		0
Amounts of Recognized Liabilities presented in the Statements of Financial Condition	-22,143,569
Financial Instruments for the Benefit of /the Counterparties	22,143,569
Cash Collateral for the Benefit of / the Counterparties	0
Net Amount	0
ProShares Ultra Bloomberg Crude Oil [Member] | Societe Generale S.A. [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition		275,816
Financial Instruments for the Funds /the Counterparties		-275,816
Cash Collateral for the Funds / the Counterparties		0
Net Amount		0
Amounts of Recognized Liabilities presented in the Statements of Financial Condition	-5,528,160
Financial Instruments for the Benefit of /the Counterparties	5,528,160
Cash Collateral for the Benefit of / the Counterparties	0
Net Amount	0
ProShares Ultra Gold [Member] | Deutsche Bank AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	1,231,694
Financial Instruments for the Funds /the Counterparties	0
Cash Collateral for the Funds / the Counterparties	-1,231,694
Net Amount	0
Amounts of Recognized Liabilities presented in the Statements of Financial Condition		-3,543,937
Financial Instruments for the Benefit of /the Counterparties		3,543,937
Cash Collateral for the Benefit of / the Counterparties		0
Net Amount		0
ProShares Ultra Gold [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	222,126
Financial Instruments for the Funds /the Counterparties	0
Cash Collateral for the Funds / the Counterparties	0
Net Amount	222,126
Amounts of Recognized Liabilities presented in the Statements of Financial Condition		-1,327,335
Financial Instruments for the Benefit of /the Counterparties		1,327,335
Cash Collateral for the Benefit of / the Counterparties		0
Net Amount		0
ProShares Ultra Gold [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	406,743
Financial Instruments for the Funds /the Counterparties	-406,743
Cash Collateral for the Funds / the Counterparties	0
Net Amount	0
Amounts of Recognized Liabilities presented in the Statements of Financial Condition		-1,156,664
Financial Instruments for the Benefit of /the Counterparties		1,156,664
Cash Collateral for the Benefit of / the Counterparties		0
Net Amount		0
ProShares Ultra Gold [Member] | Societe Generale S.A. [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	190,591
Financial Instruments for the Funds /the Counterparties	-190,591
Cash Collateral for the Funds / the Counterparties	0
Net Amount	0
Amounts of Recognized Liabilities presented in the Statements of Financial Condition		-785,038
Financial Instruments for the Benefit of /the Counterparties		785,038
Cash Collateral for the Benefit of / the Counterparties		0
Net Amount		0
ProShares Ultra Silver [Member] | Deutsche Bank AG [Member]
Derivative [Line Items]
Amounts of Recognized Liabilities presented in the Statements of Financial Condition	-6,220,069	-350,663
Financial Instruments for the Benefit of /the Counterparties	6,220,069	350,663
Cash Collateral for the Benefit of / the Counterparties	0	0
Net Amount	0	0
ProShares Ultra Silver [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Liabilities presented in the Statements of Financial Condition	-2,124,796	-1,345,433
Financial Instruments for the Benefit of /the Counterparties	2,124,796	1,345,433
Cash Collateral for the Benefit of / the Counterparties	0	0
Net Amount	0	0
ProShares Ultra Silver [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Liabilities presented in the Statements of Financial Condition	-2,666,048	-768,203
Financial Instruments for the Benefit of /the Counterparties	2,666,048	768,203
Cash Collateral for the Benefit of / the Counterparties	0	0
Net Amount	0	0
ProShares Ultra Silver [Member] | Societe Generale S.A. [Member]
Derivative [Line Items]
Amounts of Recognized Liabilities presented in the Statements of Financial Condition	-1,384,207	-28,581
Financial Instruments for the Benefit of /the Counterparties	1,384,207	28,581
Cash Collateral for the Benefit of / the Counterparties	0	0
Net Amount	0	0
ProShares Ultra Euro [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition		37,221
Financial Instruments for the Funds /the Counterparties		0
Cash Collateral for the Funds / the Counterparties		0
Net Amount		37,221
Amounts of Recognized Liabilities presented in the Statements of Financial Condition	-38,856
Financial Instruments for the Benefit of /the Counterparties	38,856
Cash Collateral for the Benefit of / the Counterparties	0
Net Amount	0
ProShares Ultra Euro [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition		63,741
Financial Instruments for the Funds /the Counterparties		0
Cash Collateral for the Funds / the Counterparties		0
Net Amount		63,741
Amounts of Recognized Liabilities presented in the Statements of Financial Condition	-64,515
Financial Instruments for the Benefit of /the Counterparties	64,515
Cash Collateral for the Benefit of / the Counterparties	0
Net Amount	0
ProShares Ultra Yen [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Liabilities presented in the Statements of Financial Condition	-12,255	-75,847
Financial Instruments for the Benefit of /the Counterparties	12,255	75,847
Cash Collateral for the Benefit of / the Counterparties	0	0
Net Amount	0	0
ProShares Ultra Yen [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Liabilities presented in the Statements of Financial Condition	-2,990	-83,462
Financial Instruments for the Benefit of /the Counterparties	2,990	83,462
Cash Collateral for the Benefit of / the Counterparties	0	0
Net Amount	$0	$0

Agreements_Additional_Informat

Agreements - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014
Health Care Trust Fund [Line Items]
Management Fee paid to sponsor, percent per annum of the average daily NAV of each Geared Fund	0.85%
Percentage of annual NAV as limit to pay SEC registration fees incurred	0.02%
Ceiling for legal fees	$100,000
Ceiling for per annum K-1 preparation and mailing fees against annual NAV	0.10%
Managed Futures Fund [Member]
Health Care Trust Fund [Line Items]
Management Fee paid to sponsor, percent per annum of the average daily NAV of each Geared Fund	0.75%
Leverage Fund [Member]
Health Care Trust Fund [Line Items]
Management Fee paid to sponsor, percent per annum of the average daily NAV of each Geared Fund	0.95%
Geared VIX Fund [Member]
Health Care Trust Fund [Line Items]
Management Fee paid to sponsor, percent per annum of the average daily NAV of each Geared Fund	0.95%
Short Euro Fund [Member]
Health Care Trust Fund [Line Items]
Management Fee paid to sponsor, percent per annum of the average daily NAV of each Geared Fund	0.95%
Volatility Index Fund [Member]
Health Care Trust Fund [Line Items]
Management Fee paid to sponsor, percent per annum of the average daily NAV of each Geared Fund	0.85%

Offering_Costs_Additional_Info

Offering Costs - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014
Organization And Offering Costs [Line Items]
Offering costs, amortization period	12 months
Sponsor reimbursement of organization and offering costs, maximum for each Leveraged Fund	0.85%
Managed Futures Fund [Member]
Organization And Offering Costs [Line Items]
Sponsor reimbursement of organization and offering costs, maximum for each Leveraged Fund	0.75%
New Fund [Member]
Organization And Offering Costs [Line Items]
Sponsor reimbursement of organization and offering costs, maximum for each Leveraged Fund	0.95%

Creation_and_Redemption_of_Cre2

Creation and Redemption of Creation Units - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014
Creation And Redemption Of Creation Units [Line Items]
Creation Unit, block Shares of a Fund	50,000
Fixed transaction fee per Creation Unit	500
Variable transaction fee, percent of the value of the Creation Unit, maximum	0.10%
Managed Futures Fund [Member]
Creation And Redemption Of Creation Units [Line Items]
Creation Unit, block Shares of a Fund	50,000
Volatility Index Fund [Member]
Creation And Redemption Of Creation Units [Line Items]
Creation Unit, block Shares of a Fund	25,000
Variable transaction fee, percent of the value of the Creation Unit, maximum	0.05%

Creation_and_Redemption_of_Cre3

Creation and Redemption of Creation Units - Schedule of Transaction Fees (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Creation And Redemption Of Creation Units [Line Items]
Transaction fees	$1,805,293	$1,894,962	$1,580,406
ProShares VIX Short-Term Futures ETF [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees	72,020
ProShares VIX Mid-Term Futures ETF [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees	8,927
ProShares Short VIX Short-Term Futures ETF [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees	218,121	130,779	119,942
ProShares Ultra VIX Short-Term Futures ETF [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees	734,298	814,195	639,726
ProShares UltraShort Bloomberg Commodity [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees			1,344
ProShares UltraShort Bloomberg Crude Oil [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees	257,458	298,261	120,983
Proshares UltraShort Bloomberg Natural Gas [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees	26,053	7,434	6,200
ProShares UltraShort Gold [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees	32,473	105,508	15,695
ProShares UltraShort Silver [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees	48,832	128,850	148,662
ProShares Ultra Bloomberg Commodity [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees	249	487	603
ProShares Ultra Bloomberg Crude Oil [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees	299,493	236,956	317,803
Proshares Ultra Bloomberg Natural Gas [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees	30,073	42,172	19,179
ProShares Ultra Gold [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees	12,088	23,035	26,057
ProShares Ultra Silver [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees	$65,208	$107,285	$164,212

Financial_Highlights_Per_Share

Financial Highlights - Per Share Operating Performance (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012
ProShares Managed Futures Strategy [Member]
Financial Highlights [Line Items]
Net asset value, beginning balance	$20
Net investment income (loss)	($0.04)
Net realized and unrealized gain (loss)	$1.18
Change in net asset value from operations	$1.14
Net asset value, ending balance	$21.14	[1]
Market value per share, ending balance	$21.28	[1]
Total Return, at net asset value	5.70%
Total Return, at market value	6.40%
Ratios to Average Net Assets
Expense ratio	-0.82%
Expense ratio, excluding brokerage commissions	-0.75%
Net investment income (loss)	-0.82%
ProShares VIX Short-Term Futures ETF [Member]
Financial Highlights [Line Items]
Net asset value, beginning balance	$28.54		$83.94	$381.87
Net investment income (loss)	($0.20)		($0.35)	($1.03)
Net realized and unrealized gain (loss)	($7.40)		($55.05)	($296.90)
Change in net asset value from operations	($7.61)		($55.40)	($297.93)
Net asset value, ending balance	$20.93		$28.54	$83.94
Market value per share, beginning balance	$28.53		$85.05	$378.70
Market value per share, ending balance	$20.99		$28.53	$85.05
Total Return, at net asset value	-26.70%		-66.00%	-78.00%
Total Return, at market value	-26.40%		-66.50%	-77.50%
Ratios to Average Net Assets
Expense ratio	-0.92%		-0.85%	-0.85%
Expense ratio, excluding brokerage commissions	-0.85%		-0.85%	-0.85%
Net investment income (loss)	-0.88%		-0.81%	-0.79%
ProShares VIX Mid-Term Futures ETF [Member]
Financial Highlights [Line Items]
Net asset value, beginning balance	$77.18		$138.80	$296.56
Net investment income (loss)	($0.57)		($0.79)	($1.62)
Net realized and unrealized gain (loss)	($13.02)		($60.83)	($156.14)
Change in net asset value from operations	($13.58)		($61.62)	($157.76)
Net asset value, ending balance	$63.60		$77.18	$138.80
Market value per share, beginning balance	$77.16		$136.88	$296.52
Market value per share, ending balance	$63.89		$77.16	$136.88
Total Return, at net asset value	-17.60%		-44.40%	-53.20%
Total Return, at market value	-17.20%		-43.60%	-53.80%
Ratios to Average Net Assets
Expense ratio	-0.87%		-0.85%	-0.85%
Expense ratio, excluding brokerage commissions	-0.85%		-0.85%	-0.85%
Net investment income (loss)	-0.84%		-0.81%	-0.80%
ProShares Short VIX Short-Term Futures ETF [Member]
Financial Highlights [Line Items]
Net asset value, beginning balance	$67.50		$33.06	$12.93
Net investment income (loss)	($1.02)		($0.74)	($0.42)
Net realized and unrealized gain (loss)	($5.07)		$35.17	$20.55
Change in net asset value from operations	($6.10)		$34.43	$20.13
Net asset value, ending balance	$61.40		$67.50	$33.06
Market value per share, beginning balance	$67.47		$32.73	$13.07
Market value per share, ending balance	$61.16		$67.47	$32.73
Total Return, at net asset value	-9.00%		104.10%	155.70%
Total Return, at market value	-9.40%		106.20%	150.40%
Ratios to Average Net Assets
Expense ratio	-1.49%		-1.53%	-1.63%
Expense ratio, excluding brokerage commissions	-0.95%		-0.95%	-0.95%
Net investment income (loss)	-1.46%		-1.49%	-1.56%
ProShares Ultra VIX Short-Term Futures ETF [Member]
Financial Highlights [Line Items]
Net asset value, beginning balance	$67.08		$805.27	$29,673.01
Net investment income (loss)	($0.58)		($3.00)	($38.43)
Net realized and unrealized gain (loss)	($41.41)		($735.19)	($28,829.31)
Change in net asset value from operations	($41.99)		($738.19)	($28,867.74)
Net asset value, ending balance	$25.09		$67.08	$805.27
Market value per share, beginning balance	$67.12		$836	$29,184
Market value per share, ending balance	$25.15		$67.12	$836
Total Return, at net asset value	-62.60%		-91.70%	-97.30%
Total Return, at market value	-62.50%		-92.00%	-97.10%
Ratios to Average Net Assets
Expense ratio	-1.80%		-1.82%	-1.77%
Expense ratio, excluding brokerage commissions	-0.95%		-0.95%	-0.95%
Net investment income (loss)	-1.78%		-1.80%	-1.73%
ProShares UltraShort Bloomberg Commodity [Member]
Financial Highlights [Line Items]
Net asset value, beginning balance	$63.29		$54.10	$56.92
Net investment income (loss)	($0.57)		($0.54)	($0.49)
Net realized and unrealized gain (loss)	$25.02		$9.73	($2.33)
Change in net asset value from operations	$24.46		$9.19	($2.82)
Net asset value, ending balance	$87.75		$63.29	$54.10
Market value per share, beginning balance	$58.41		$51.64	$56.19
Market value per share, ending balance	$87.44		$58.41	$51.64
Total Return, at net asset value	38.60%		17.00%	-5.00%
Total Return, at market value	49.70%		13.10%	-8.10%
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)	-0.92%		-0.90%	-0.89%
ProShares UltraShort Bloomberg Crude Oil [Member]
Financial Highlights [Line Items]
Net asset value, beginning balance	$31.73		$40.31	$38.82
Net investment income (loss)	($0.28)		($0.30)	($0.36)
Net realized and unrealized gain (loss)	$46.53		($8.27)	$1.85
Change in net asset value from operations	$46.25		($8.58)	$1.49
Net asset value, ending balance	$77.98		$31.73	$40.31
Market value per share, beginning balance	$31.58		$40.44	$38.69
Market value per share, ending balance	$76.52		$31.58	$40.44
Total Return, at net asset value	145.80%		-21.30%	3.80%
Total Return, at market value	142.30%		-21.90%	4.50%
Ratios to Average Net Assets
Expense ratio	-0.98%		-0.98%	-0.98%
Expense ratio, excluding brokerage commissions	-0.95%		-0.95%	-0.95%
Net investment income (loss)	-0.94%		-0.94%	-0.91%
Proshares UltraShort Bloomberg Natural Gas [Member]
Financial Highlights [Line Items]
Net asset value, beginning balance	$69.96		$102.14	$95.22
Net investment income (loss)	($0.50)		($0.92)	($1.56)
Net realized and unrealized gain (loss)	$14.49		($31.25)	$8.48
Change in net asset value from operations	$13.99		($32.18)	$6.92
Net asset value, ending balance	$83.96		$69.96	$102.14
Market value per share, beginning balance	$69.36		$101.64	$95.84
Market value per share, ending balance	$82.03		$69.36	$101.64
Total Return, at net asset value	20.00%		-31.50%	7.30%
Total Return, at market value	18.30%		-31.80%	6.10%
Ratios to Average Net Assets
Expense ratio	-1.18%		-1.20%	-1.39%
Expense ratio, excluding brokerage commissions	-0.95%		-0.95%	-0.95%
Net investment income (loss)	-1.14%		-1.15%	-1.33%
ProShares UltraShort Gold [Member]
Financial Highlights [Line Items]
Net asset value, beginning balance	$103.52		$63.87	$82.71
Net investment income (loss)	($0.82)		($0.76)	($0.59)
Net realized and unrealized gain (loss)	($6.04)		$40.41	($18.25)
Change in net asset value from operations	($6.87)		$39.65	($18.84)
Net asset value, ending balance	$96.65		$103.52	$63.87
Market value per share, beginning balance	$103.53		$62.60	$79.24
Market value per share, ending balance	$100.22		$103.53	$62.60
Total Return, at net asset value	-6.60%		62.10%	-22.80%
Total Return, at market value	-3.20%		65.40%	-21.00%
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)	-0.91%		-0.90%	-0.89%
ProShares UltraShort Silver [Member]
Financial Highlights [Line Items]
Net asset value, beginning balance	$89.78		$51.40	$76.68
Net investment income (loss)	($0.79)		($0.62)	($0.48)
Net realized and unrealized gain (loss)	$26.62		$39.01	($24.80)
Change in net asset value from operations	$25.83		$38.39	($25.28)
Net asset value, ending balance	$115.61		$89.78	$51.40
Market value per share, beginning balance	$90.19		$50.07	$79.35
Market value per share, ending balance	$119.39		$90.19	$50.07
Total Return, at net asset value	28.80%		74.70%	-33.00%
Total Return, at market value	32.40%		80.10%	-36.90%
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)	-0.90%		-0.89%	-0.89%
ProShares Short Euro [Member]
Financial Highlights [Line Items]
Net asset value, beginning balance	$35.59		$37.63	$40
Net investment income (loss)	($0.34)		($0.34)	($0.18)
Net realized and unrealized gain (loss)	$4.82		($1.70)	($2.19)
Change in net asset value from operations	$4.47		($2.04)	($2.37)
Net asset value, ending balance	$40.06		$35.59	$37.63
Market value per share, beginning balance	$35.66		$37.64	$40
Market value per share, ending balance	$40.03		$35.66	$37.64
Total Return, at net asset value	12.60%		-5.40%	-5.90%
Total Return, at market value	12.30%		-5.30%	-5.90%
Ratios to Average Net Assets
Expense ratio	-0.96%		-0.96%	-0.96%
Expense ratio, excluding brokerage commissions	-0.95%		-0.95%	-0.95%
Net investment income (loss)	-0.93%		-0.93%	-0.89%
ProShares UltraShort Australian Dollar [Member]
Financial Highlights [Line Items]
Net asset value, beginning balance	$46.64		$37.81	$40
Net investment income (loss)	($0.43)		($0.43)	($0.16)
Net realized and unrealized gain (loss)	$5.17		$9.26	($2.03)
Change in net asset value from operations	$4.74		$8.83	($2.19)
Net asset value, ending balance	$51.38		$46.64	$37.81
Market value per share, beginning balance	$46.66		$37.74	$40
Market value per share, ending balance	$51.37		$46.66	$37.74
Total Return, at net asset value	10.20%		23.40%	-5.50%
Total Return, at market value	10.10%		23.60%	-5.70%
Ratios to Average Net Assets
Expense ratio	-1.01%		-1.02%	-1.00%
Expense ratio, excluding brokerage commissions	-0.95%		-0.95%	-0.95%
Net investment income (loss)	-0.97%		-0.99%	-0.92%
ProShares UltraShort Euro [Member]
Financial Highlights [Line Items]
Net asset value, beginning balance	$17.06		$19.02	$20.34
Net investment income (loss)	($0.16)		($0.17)	($0.18)
Net realized and unrealized gain (loss)	$4.70		($1.79)	($1.14)
Change in net asset value from operations	$4.53		($1.96)	($1.32)
Net asset value, ending balance	$21.59		$17.06	$19.02
Market value per share, beginning balance	$17.06		$19.01	$20.35
Market value per share, ending balance	$21.61		$17.06	$19.01
Total Return, at net asset value	26.60%		-10.30%	-6.50%
Total Return, at market value	26.70%		-10.30%	-6.60%
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)	-0.90%		-0.90%	-0.89%
ProShares UltraShort Yen [Member]
Financial Highlights [Line Items]
Net asset value, beginning balance	$70.86		$50.76	$40.96
Net investment income (loss)	($0.64)		($0.57)	($0.38)
Net realized and unrealized gain (loss)	$19.11		$20.67	$10.19
Change in net asset value from operations	$18.47		$20.11	$9.80
Net asset value, ending balance	$89.33		$70.86	$50.76
Market value per share, beginning balance	$70.91		$50.77	$40.95
Market value per share, ending balance	$89.30		$70.91	$50.77
Total Return, at net asset value	26.10%		39.60%	23.90%
Total Return, at market value	25.90%		39.70%	24.00%
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)	-0.90%		-0.91%	-0.88%
ProShares Ultra Bloomberg Commodity [Member]
Financial Highlights [Line Items]
Net asset value, beginning balance	$19.43		$24.39	$25.88
Net investment income (loss)	($0.18)		($0.19)	($0.23)
Net realized and unrealized gain (loss)	($6.22)		($4.76)	($1.26)
Change in net asset value from operations	($6.40)		($4.96)	($1.49)
Net asset value, ending balance	$13.03		$19.43	$24.39
Market value per share, beginning balance	$19.13		$23.93	$25.64
Market value per share, ending balance	$12.86		$19.13	$23.93
Total Return, at net asset value	-32.90%		-20.30%	-5.80%
Total Return, at market value	-32.80%		-20.10%	-6.70%
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)	-0.91%		-0.90%	-0.89%
ProShares Ultra Bloomberg Crude Oil [Member]
Financial Highlights [Line Items]
Net asset value, beginning balance	$32.09		$29.39	$40.88
Net investment income (loss)	($0.22)		($0.28)	($0.29)
Net realized and unrealized gain (loss)	($21.72)		$2.98	($11.20)
Change in net asset value from operations	($21.94)		$2.70	($11.49)
Net asset value, ending balance	$10.15		$32.09	$29.39
Market value per share, beginning balance	$32.22		$29.32	$40.94
Market value per share, ending balance	$10.37		$32.22	$29.32
Total Return, at net asset value	-68.40%		9.20%	-28.10%
Total Return, at market value	-67.80%		9.90%	-28.40%
Ratios to Average Net Assets
Expense ratio	-0.99%		-0.97%	-0.97%
Expense ratio, excluding brokerage commissions	-0.95%		-0.95%	-0.95%
Net investment income (loss)	-0.95%		-0.92%	-0.91%
Proshares Ultra Bloomberg Natural Gas [Member]
Financial Highlights [Line Items]
Net asset value, beginning balance	$38.84		$39.05	$101.98
Net investment income (loss)	($0.38)		($0.41)	($0.52)
Net realized and unrealized gain (loss)	($23.05)		$0.19	($62.41)
Change in net asset value from operations	($23.43)		($0.21)	($62.93)
Net asset value, ending balance	$15.41		$38.84	$39.05
Market value per share, beginning balance	$39.28		$39.24	$101.35
Market value per share, ending balance	$15.78		$39.28	$39.24
Total Return, at net asset value	-60.30%		-0.50%	-61.70%
Total Return, at market value	-59.80%		0.10%	-61.30%
Ratios to Average Net Assets
Expense ratio	-1.13%		-1.15%	-1.21%
Expense ratio, excluding brokerage commissions	-0.95%		-0.95%	-0.95%
Net investment income (loss)	-1.10%		-1.10%	-1.15%
ProShares Ultra Gold [Member]
Financial Highlights [Line Items]
Net asset value, beginning balance	$41.26		$83.76	$75.91
Net investment income (loss)	($0.41)		($0.54)	($0.77)
Net realized and unrealized gain (loss)	($0.85)		($41.97)	$8.62
Change in net asset value from operations	($1.25)		($42.51)	$7.86
Net asset value, ending balance	$40.00		$41.26	$83.76
Market value per share, beginning balance	$41.26		$85.34	$79.01
Market value per share, ending balance	$38.41		$41.26	$85.34
Total Return, at net asset value	-3.00%		-50.70%	10.40%
Total Return, at market value	-6.90%		-51.70%	8.00%
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)	-0.91%		-0.89%	-0.88%
ProShares Ultra Silver [Member]
Financial Highlights [Line Items]
Net asset value, beginning balance	$63.33		$171.89	$172.76
Net investment income (loss)	($0.53)		($0.88)	($1.73)
Net realized and unrealized gain (loss)	($23.43)		($107.68)	$0.86
Change in net asset value from operations	($23.96)		($108.56)	($0.87)
Net asset value, ending balance	$39.37		$63.33	$171.89
Market value per share, beginning balance	$63.04		$176.40	$166.60
Market value per share, ending balance	$38.05		$63.04	$176.40
Total Return, at net asset value	-37.80%		-63.20%	-0.50%
Total Return, at market value	-39.60%		-64.30%	5.90%
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)	-0.91%		-0.89%	-0.88%
ProShares Ultra Australian Dollar [Member]
Financial Highlights [Line Items]
Net asset value, beginning balance	$31.68		$41.50	$40
Net investment income (loss)	($0.31)		($0.35)	($0.17)
Net realized and unrealized gain (loss)	($3.97)		($9.47)	$1.67
Change in net asset value from operations	($4.28)		($9.82)	$1.50
Net asset value, ending balance	$27.40		$31.68	$41.50
Market value per share, beginning balance	$31.61		$41.45	$40
Market value per share, ending balance	$27.43		$31.61	$41.45
Total Return, at net asset value	-13.50%		-23.70%	3.70%
Total Return, at market value	-13.20%		-23.70%	3.60%
Ratios to Average Net Assets
Expense ratio	-1.00%		-0.99%	-1.00%
Expense ratio, excluding brokerage commissions	-0.95%		-0.95%	-0.95%
Net investment income (loss)	-0.94%		-0.95%	-0.92%
ProShares Ultra Euro [Member]
Financial Highlights [Line Items]
Net asset value, beginning balance	$26.03		$24.35	$23.89
Net investment income (loss)	($0.22)		($0.22)	($0.21)
Net realized and unrealized gain (loss)	($5.94)		$1.90	$0.67
Change in net asset value from operations	($6.16)		$1.68	$0.46
Net asset value, ending balance	$19.87		$26.03	$24.35
Market value per share, beginning balance	$25.98		$24.32	$23.87
Market value per share, ending balance	$19.80		$25.98	$24.32
Total Return, at net asset value	-23.70%		6.90%	1.90%
Total Return, at market value	-23.80%		6.80%	1.90%
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)	-0.91%		-0.90%	-0.90%
ProShares Ultra Yen [Member]
Financial Highlights [Line Items]
Net asset value, beginning balance	$18.63		$28.18	$36.47
Net investment income (loss)	($0.17)		($0.20)	($0.30)
Net realized and unrealized gain (loss)	($4.35)		($9.35)	($7.99)
Change in net asset value from operations	($4.51)		($9.55)	($8.29)
Net asset value, ending balance	$14.12		$18.63	$28.18
Market value per share, beginning balance	$18.61		$28.28	$36.50
Market value per share, ending balance	$14.12		$18.61	$28.28
Total Return, at net asset value	-24.20%		-33.90%	-22.70%
Total Return, at market value	-24.10%		-34.20%	-22.50%
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)	-0.90%		-0.90%	-0.88%
[1]	Since the Fund commenced investment operations on October 1, 2014, the Statement of Financial Condition as of December 31, 2013 has not been provided.

Financial_Highlights_Per_Share1

Financial Highlights - Per Share Operating Performance (Parenthetical) (Detail) (ProShares Managed Futures Strategy [Member], USD $)	Dec. 31, 2014		Dec. 31, 2013
Financial Highlights [Line Items]
Net asset value	$21.14	[1]	$20
Initial Offering Price [Member]
Financial Highlights [Line Items]
Net asset value	$20
[1]	Since the Fund commenced investment operations on October 1, 2014, the Statement of Financial Condition as of December 31, 2013 has not been provided.

Risk_Additional_Information_De

Risk - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014
Unusual Risk or Uncertainty [Line Items]
Percentage of calculation on simple inverse correlation	200.00%
Forward Agreements [Member]
Unusual Risk or Uncertainty [Line Items]
Exposure to swap agreements or forward contracts	100.00%
UltraShort Fund [Member]
Unusual Risk or Uncertainty [Line Items]
Leverage risk benchmark	50% at any point in the day
Managed Futures Fund [Member] | Proshares Morningstar Alternatives Solution ETF [Member]
Unusual Risk or Uncertainty [Line Items]
Equity ownership percentage	78.20%

Uncategorized_Items

Uncategorized Items
[ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation]	188	207	182
[ck0001415311_DecreaseIncreaseInLimitationBySponsor]	2,145	1,012	2,216	9,474
[ck0001415311_DecreaseIncreaseInOfferingCosts]	-21,230	-18,872	-18,871	49,384
[ck0001415311_DecreaseIncreaseInReceivableOnOpenFuturesContracts]	6,612	12,000		17,445
[ck0001415311_DecreaseIncreaseInSegregatedCashBalancesWithBrokersForFuturesContracts]	63,250	158,400	144,540	195,142
[ck0001415311_IncreaseDecreaseInPayableForOfferingCosts]				65,785
[ck0001415311_IncreaseDecreaseInPayableOnFuturesContracts]			10,950
[ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations]	3,409,716	3,570,687	3,302,725
[us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease]	302,159	426,434	360,957	6,135,185
[us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations]	4,000,000	4,000,000	4,000,000	6,135,043
[us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations]	-3,697,841	-3,573,566	-3,639,043	142
[us-gaap_PaymentsForRepurchaseOfCommonStock]				2,039,561
[us-gaap_ProceedsFromIssuanceOfCommonStock]	4,000,000	4,000,000	4,000,000	8,174,604