v3.10.0.1

Investments - Gross Amounts Not Offset in Statements of Financial Condition (Detail) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
ProShares Ultra Bloomberg Crude Oil [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	$ 21,365,763	$ 16,654,031
Financial Instruments for the Benefit of (the Funds) / the Counterparties	(20,159,696)	(14,861,090)
Net Amounts of Assets presented in the Statements of Financial Condition	1,206,067	1,792,941
ProShares Ultra Bloomberg Crude Oil [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	21,864,163	16,764,919
Financial Instruments for the Benefit of (the Funds) / the Counterparties	(20,658,539)	(15,477,566)
Net Amounts of Assets presented in the Statements of Financial Condition	1,205,624	1,287,353
ProShares Ultra Bloomberg Crude Oil [Member] | Citibank N.A. [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	29,027,266	19,815,892
Net Amounts of Assets presented in the Statements of Financial Condition	29,027,266	19,815,892
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	8,999,126	9,003,519
Financial Instruments for the Benefit of (the Funds) / the Counterparties	(8,942,433)	(8,525,505)
Net Amounts of Assets presented in the Statements of Financial Condition	56,693	478,014
ProShares Ultra Bloomberg Crude Oil [Member] | RBC. NA [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	1,172,552
Net Amounts of Assets presented in the Statements of Financial Condition	1,172,552
ProShares Ultra Euro [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition		102,424
Net Amounts of Assets presented in the Statements of Financial Condition		102,424
Amounts of Recognized Assets presented in the Statements of Financial Condition	(77,986)
Cash Collateral for the Benefit of (the Funds) / the Counterparties	77,986
ProShares Ultra Euro [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition		161,728
Net Amounts of Assets presented in the Statements of Financial Condition		161,728
Amounts of Recognized Assets presented in the Statements of Financial Condition	(94,068)
Cash Collateral for the Benefit of (the Funds) / the Counterparties	94,068
ProShares Ultra Gold [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition		969,501
Financial Instruments for the Benefit of (the Funds) / the Counterparties		(967,678)
Cash Collateral for the Benefit of (the Funds) / the Counterparties		(1,823)
Amounts of Recognized Assets presented in the Statements of Financial Condition	(1,977,494)
Financial Instruments for the Benefit of (the Funds) / the Counterparties	1,977,494
ProShares Ultra Gold [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition		945,225
Financial Instruments for the Benefit of (the Funds) / the Counterparties		(945,225)
Amounts of Recognized Assets presented in the Statements of Financial Condition	(1,952,388)
Financial Instruments for the Benefit of (the Funds) / the Counterparties	1,952,388
ProShares Ultra Gold [Member] | Citibank N.A. [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition		1,513,310
Net Amounts of Assets presented in the Statements of Financial Condition		1,513,310
Amounts of Recognized Assets presented in the Statements of Financial Condition	(2,546,835)
Financial Instruments for the Benefit of (the Funds) / the Counterparties	2,546,835
ProShares Ultra Gold [Member] | Societe Generale S.A. [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition		218,319
Net Amounts of Assets presented in the Statements of Financial Condition		218,319
Amounts of Recognized Assets presented in the Statements of Financial Condition	(676,179)
Financial Instruments for the Benefit of (the Funds) / the Counterparties	676,179
ProShares Ultra Silver [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition		5,873,080
Financial Instruments for the Benefit of (the Funds) / the Counterparties		(4,903,696)
Net Amounts of Assets presented in the Statements of Financial Condition		969,384
Amounts of Recognized Assets presented in the Statements of Financial Condition	(4,075,705)
Financial Instruments for the Benefit of (the Funds) / the Counterparties	732,705
Cash Collateral for the Benefit of (the Funds) / the Counterparties	3,343,000
ProShares Ultra Silver [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition		5,898,693
Financial Instruments for the Benefit of (the Funds) / the Counterparties		(4,930,596)
Net Amounts of Assets presented in the Statements of Financial Condition		968,097
Amounts of Recognized Assets presented in the Statements of Financial Condition	(3,722,182)
Financial Instruments for the Benefit of (the Funds) / the Counterparties	3,722,182
ProShares Ultra Silver [Member] | Citibank N.A. [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition		7,201,744
Net Amounts of Assets presented in the Statements of Financial Condition		7,201,744
Amounts of Recognized Assets presented in the Statements of Financial Condition	(4,560,857)
Cash Collateral for the Benefit of (the Funds) / the Counterparties	4,560,857
ProShares Ultra Silver [Member] | Societe Generale S.A. [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition		2,761,817
Financial Instruments for the Benefit of (the Funds) / the Counterparties		(2,516,153)
Net Amounts of Assets presented in the Statements of Financial Condition		245,664
Amounts of Recognized Assets presented in the Statements of Financial Condition	(1,789,967)
Financial Instruments for the Benefit of (the Funds) / the Counterparties	1,789,967
ProShares VIX Short-Term Futures ETF [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	(1,038,439)
Cash Collateral for the Benefit of (the Funds) / the Counterparties	1,038,439
ProShares VIX Short-Term Futures ETF [Member] | Deutsche Bank [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	1,302,919
Cash Collateral for the Benefit of (the Funds) / the Counterparties	(1,302,919)
ProShares Ultra Yen [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	(11,885)	(17,410)
Financial Instruments for the Benefit of (the Funds) / the Counterparties		17,410
Cash Collateral for the Benefit of (the Funds) / the Counterparties	11,885
Net Amounts of Liabilities presented in the Statements of Financial Condition
ProShares Ultra Yen [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	(12,374)	(17,414)
Financial Instruments for the Benefit of (the Funds) / the Counterparties		17,414
Cash Collateral for the Benefit of (the Funds) / the Counterparties	12,374
Net Amounts of Liabilities presented in the Statements of Financial Condition
ProShares UltraShort Bloomberg Crude Oil [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	(8,713,478)	(9,242,398)
Financial Instruments for the Benefit of (the Funds) / the Counterparties	8,713,478	9,242,398
Net Amounts of Liabilities presented in the Statements of Financial Condition
ProShares UltraShort Bloomberg Crude Oil [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	(8,567,454)	(9,287,467)
Financial Instruments for the Benefit of (the Funds) / the Counterparties	6,870,954	9,287,467
Cash Collateral for the Benefit of (the Funds) / the Counterparties	1,696,500
Net Amounts of Liabilities presented in the Statements of Financial Condition
ProShares UltraShort Bloomberg Crude Oil [Member] | Citibank N.A. [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	(11,914,957)	(10,173,164)
Financial Instruments for the Benefit of (the Funds) / the Counterparties	11,914,957	10,173,164
Net Amounts of Liabilities presented in the Statements of Financial Condition
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	(3,627,720)	(1,904,113)
Financial Instruments for the Benefit of (the Funds) / the Counterparties	3,627,720	1,904,113
Net Amounts of Liabilities presented in the Statements of Financial Condition
ProShares UltraShort Bloomberg Crude Oil [Member] | RBC. NA [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	(944,591)
Net Amounts of Liabilities presented in the Statements of Financial Condition	(944,591)
ProShares UltraShort Euro [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	1,779,254
Financial Instruments for the Benefit of (the Funds) / the Counterparties	(1,779,254)
Amounts of Recognized Assets presented in the Statements of Financial Condition		(3,297,612)
Financial Instruments for the Benefit of (the Funds) / the Counterparties		259,612
Cash Collateral for the Benefit of (the Funds) / the Counterparties		3,038,000
Net Amounts of Liabilities presented in the Statements of Financial Condition
ProShares UltraShort Euro [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	1,620,696
Financial Instruments for the Benefit of (the Funds) / the Counterparties	(1,620,696)
Amounts of Recognized Assets presented in the Statements of Financial Condition		(3,046,657)
Financial Instruments for the Benefit of (the Funds) / the Counterparties		3,046,657
Net Amounts of Liabilities presented in the Statements of Financial Condition
ProShares UltraShort Gold [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	615,252
Financial Instruments for the Benefit of (the Funds) / the Counterparties	(577,828)
Net Amounts of Assets presented in the Statements of Financial Condition	37,424
Amounts of Recognized Assets presented in the Statements of Financial Condition		(428,358)
Financial Instruments for the Benefit of (the Funds) / the Counterparties		428,358
Net Amounts of Liabilities presented in the Statements of Financial Condition
ProShares UltraShort Gold [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	621,773
Financial Instruments for the Benefit of (the Funds) / the Counterparties	(581,161)
Net Amounts of Assets presented in the Statements of Financial Condition	40,612
Amounts of Recognized Assets presented in the Statements of Financial Condition		(378,414)
Financial Instruments for the Benefit of (the Funds) / the Counterparties		378,414
Net Amounts of Liabilities presented in the Statements of Financial Condition
ProShares UltraShort Gold [Member] | Citibank N.A. [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	793,507
Net Amounts of Assets presented in the Statements of Financial Condition	793,507
Amounts of Recognized Assets presented in the Statements of Financial Condition		(554,559)
Financial Instruments for the Benefit of (the Funds) / the Counterparties		554,559
Net Amounts of Liabilities presented in the Statements of Financial Condition
ProShares UltraShort Gold [Member] | Societe Generale S.A. [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	246,078
Financial Instruments for the Benefit of (the Funds) / the Counterparties	(246,078)
Amounts of Recognized Assets presented in the Statements of Financial Condition		(126,928)
Financial Instruments for the Benefit of (the Funds) / the Counterparties		126,928
Net Amounts of Liabilities presented in the Statements of Financial Condition
ProShares UltraShort Silver [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	402,097
Financial Instruments for the Benefit of (the Funds) / the Counterparties	(349,222)
Net Amounts of Assets presented in the Statements of Financial Condition	52,875
Amounts of Recognized Assets presented in the Statements of Financial Condition		(486,240)
Cash Collateral for the Benefit of (the Funds) / the Counterparties		486,240
Net Amounts of Liabilities presented in the Statements of Financial Condition
ProShares UltraShort Silver [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	384,979
Net Amounts of Assets presented in the Statements of Financial Condition	384,979
Amounts of Recognized Assets presented in the Statements of Financial Condition		(482,025)
Financial Instruments for the Benefit of (the Funds) / the Counterparties		482,025
Net Amounts of Liabilities presented in the Statements of Financial Condition
ProShares UltraShort Silver [Member] | Citibank N.A. [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	582,164
Net Amounts of Assets presented in the Statements of Financial Condition	582,164
Amounts of Recognized Assets presented in the Statements of Financial Condition		(632,593)
Financial Instruments for the Benefit of (the Funds) / the Counterparties		632,593
Net Amounts of Liabilities presented in the Statements of Financial Condition
ProShares UltraShort Silver [Member] | Societe Generale S.A. [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	83,545
Net Amounts of Assets presented in the Statements of Financial Condition	83,545
Amounts of Recognized Assets presented in the Statements of Financial Condition		(115,305)
Financial Instruments for the Benefit of (the Funds) / the Counterparties		115,305
Net Amounts of Liabilities presented in the Statements of Financial Condition
ProShares UltraShort Yen [Member] | Goldman Sachs International [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	348,163	821,317
Financial Instruments for the Benefit of (the Funds) / the Counterparties		(810,030)
Net Amounts of Assets presented in the Statements of Financial Condition	348,163	11,287
ProShares UltraShort Yen [Member] | UBS AG [Member]
Derivative [Line Items]
Amounts of Recognized Assets presented in the Statements of Financial Condition	345,155	705,946
Cash Collateral for the Benefit of (the Funds) / the Counterparties		$ (705,946)
Net Amounts of Assets presented in the Statements of Financial Condition	$ 345,155

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