Schedule of Investments - Foreign Currency Forward Contracts (Detail)		12 Months Ended
		Dec. 31, 2016 USD ($)		Dec. 31, 2015 USD ($)		Dec. 31, 2016 JPY (¥)	[3]	Dec. 31, 2016 EUR (€)	[1]	Dec. 31, 2015 JPY (¥)		Dec. 31, 2015 EUR (€)	[2]
ProShares UltraShort Euro [Member] | Contracts to Purchase [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)		$ (60,534)	[1]	$ (1,965,394)	[2]
ProShares UltraShort Euro [Member] | Contracts to Purchase [Member] | Euro with Goldman Sachs International [Member]
Schedule of Investments [Line Items]
Settlement Date		Jan. 13, 2017	[1]	Jan. 08, 2016	[2]
Notional Amount		$ 69,424,004	[1]	$ 140,627,935	[2]			€ 65,899,000				€ 129,386,700
Unrealized Appreciation (Depreciation)		$ 295,605	[1]	$ (1,100,282)	[2]
ProShares UltraShort Euro [Member] | Contracts to Purchase [Member] | Euro with UBS AG [Member]
Schedule of Investments [Line Items]
Settlement Date		Jan. 13, 2017	[1]	Jan. 08, 2016	[2]
Notional Amount		$ 23,557,639	[1]	$ 81,943,430	[2]			22,361,500				75,393,200
Unrealized Appreciation (Depreciation)		(356,139)	[1]	(865,112)	[2]
ProShares UltraShort Euro [Member] | Contracts to Sell [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)		$ 16,223,465	[1]	$ (26,744,942)	[2]
ProShares UltraShort Euro [Member] | Contracts to Sell [Member] | Euro with Goldman Sachs International [Member]
Schedule of Investments [Line Items]
Settlement Date		Jan. 13, 2017	[1]	Jan. 08, 2016	[2]
Notional Amount		$ (414,315,600)	[1]	$ (655,098,912)	[2]			(393,278,725)				(602,732,925)
Unrealized Appreciation (Depreciation)		$ 7,813,462	[1]	$ (13,891,742)	[2]
ProShares UltraShort Euro [Member] | Contracts to Sell [Member] | Euro with UBS AG [Member]
Schedule of Investments [Line Items]
Settlement Date		Jan. 13, 2017	[1]	Jan. 08, 2016	[2]
Notional Amount		$ (376,072,375)	[1]	$ (611,502,135)	[2]			(356,977,300)				(562,621,100)
Unrealized Appreciation (Depreciation)		8,410,003	[1]	(12,853,200)	[2]
ProShares UltraShort Yen [Member] | Contracts to Purchase [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)		$ 90,057	[3]	$ 933,727	[2]
ProShares UltraShort Yen [Member] | Contracts to Purchase [Member] | Yen with Goldman Sachs International [Member]
Schedule of Investments [Line Items]
Settlement Date		Jan. 13, 2017	[3]	Jan. 08, 2016	[2]
Notional Amount		$ 80,581,067	[3]	$ 49,402,434	[2]	¥ 9,411,824,400				¥ 5,938,040,200	[2]
Unrealized Appreciation (Depreciation)		$ 215,477	[3]	$ 319,567	[2]
ProShares UltraShort Yen [Member] | Contracts to Purchase [Member] | Yen with UBS AG [Member]
Schedule of Investments [Line Items]
Settlement Date		Jan. 13, 2017	[3]	Jan. 08, 2016	[2]
Notional Amount		$ 5,783,703	[3]	$ 95,858,003	[2]	675,533,300				11,521,875,200	[2]
Unrealized Appreciation (Depreciation)		(125,420)	[3]	614,160	[2]
ProShares UltraShort Yen [Member] | Contracts to Sell [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)		$ 16,654,880	[3]	$ (14,829,179)	[2]
ProShares UltraShort Yen [Member] | Contracts to Sell [Member] | Yen with Goldman Sachs International [Member]
Schedule of Investments [Line Items]
Settlement Date		Jan. 13, 2017	[3]	Jan. 08, 2016	[2]
Notional Amount		$ (354,548,372)	[3]	$ (280,344,651)	[2]	(41,411,055,600)				(33,696,676,000)	[2]
Unrealized Appreciation (Depreciation)		$ 8,041,302	[3]	$ (6,789,972)	[2]
ProShares UltraShort Yen [Member] | Contracts to Sell [Member] | Yen with UBS AG [Member]
Schedule of Investments [Line Items]
Settlement Date		Jan. 13, 2017	[3]	Jan. 08, 2016	[2]
Notional Amount		$ (284,180,901)	[3]	$ (339,880,862)	[2]	(33,192,173,500)				(40,852,769,100)	[2]
Unrealized Appreciation (Depreciation)		8,613,578	[3]	(8,039,207)	[2]
ProShares Ultra Euro [Member] | Contracts to Purchase [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)		$ (573,401)	[1]	$ 587,231	[2]
ProShares Ultra Euro [Member] | Contracts to Purchase [Member] | Euro with Goldman Sachs International [Member]
Schedule of Investments [Line Items]
Settlement Date		Jan. 13, 2017	[1]	Jan. 08, 2016	[2]
Notional Amount		$ 10,368,169	[1]	$ 13,533,325	[2]			9,841,725				12,451,525
Unrealized Appreciation (Depreciation)		$ (236,099)	[1]	$ 298,929	[2]
ProShares Ultra Euro [Member] | Contracts to Purchase [Member] | Euro with UBS AG [Member]
Schedule of Investments [Line Items]
Settlement Date		Jan. 13, 2017	[1]	Jan. 08, 2016	[2]
Notional Amount		$ 14,511,417	[1]	$ 12,519,346	[2]			13,774,600				11,518,600
Unrealized Appreciation (Depreciation)		(337,302)	[1]	288,302	[2]
ProShares Ultra Euro [Member] | Contracts to Sell [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)		$ (609)	[1]	$ 17,689	[2]
ProShares Ultra Euro [Member] | Contracts to Sell [Member] | Euro with Goldman Sachs International [Member]
Schedule of Investments [Line Items]
Settlement Date		Jan. 13, 2017	[1]	Jan. 08, 2016	[2]
Notional Amount		$ (756,196)	[1]	$ (3,728,762)	[2]			(717,800)				(3,430,700)
Unrealized Appreciation (Depreciation)		$ (3,157)	[1]	$ 16,425	[2]
ProShares Ultra Euro [Member] | Contracts to Sell [Member] | Euro with UBS AG [Member]
Schedule of Investments [Line Items]
Settlement Date		Jan. 13, 2017	[1]	Jan. 08, 2016	[2]
Notional Amount		$ (278,122)	[1]	$ (603,328)	[2]			€ (264,000)				€ (555,100)
Unrealized Appreciation (Depreciation)		2,548	[1]	1,264	[2]
ProShares Ultra Yen [Member] | Contracts to Purchase [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)		$ (342,455)	[3]	$ 267,014	[2]
ProShares Ultra Yen [Member] | Contracts to Purchase [Member] | Yen with Goldman Sachs International [Member]
Schedule of Investments [Line Items]
Settlement Date		Jan. 13, 2017	[3]	Jan. 08, 2016	[2]
Notional Amount		$ 7,572,024	[3]	$ 7,210,368	[2]	884,408,200				866,666,900	[2]
Unrealized Appreciation (Depreciation)		$ (220,115)	[3]	$ 172,891	[2]
ProShares Ultra Yen [Member] | Contracts to Purchase [Member] | Yen with UBS AG [Member]
Schedule of Investments [Line Items]
Settlement Date		Jan. 13, 2017	[3]	Jan. 08, 2016	[2]
Notional Amount		$ 4,025,524	[3]	$ 4,067,664	[2]	470,179,000				488,922,300	[2]
Unrealized Appreciation (Depreciation)		(122,340)	[3]	94,123	[2]
ProShares Ultra Yen [Member] | Contracts to Sell [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)		$ 379	[3]	$ (5,703)	[2]
ProShares Ultra Yen [Member] | Contracts to Sell [Member] | Yen with Goldman Sachs International [Member]
Schedule of Investments [Line Items]
Settlement Date		Jan. 13, 2017	[3]	Jan. 08, 2016	[2]
Notional Amount		$ (488,372)	[3]	$ (156,666)	[2]	¥ (57,041,600)				(18,830,800)	[2]
Unrealized Appreciation (Depreciation)		$ 379	[3]	$ (3,104)	[2]
ProShares Ultra Yen [Member] | Contracts to Sell [Member] | Yen with UBS AG [Member]
Schedule of Investments [Line Items]
Settlement Date	[2]			Jan. 08, 2016
Notional Amount	[2]			$ (175,547)						¥ (21,100,300)
Unrealized Appreciation (Depreciation)	[2]			$ (2,599)

[1] The positions and counterparties herein are as of December 31, 2016. The Funds continually evaluate different counterparties for their transactions and counterparties are subject to change. New counterparties can be added at any time.

[2] The positions and counterparties herein are as of December 31, 2015. The Funds continually evaluate different counterparties for their transactions and counterparties are subject to change. New counterparties can be added at any time.

[3] The positions and counterparties herein are as of December 31, 2016. The Funds continually evaluate different counterparties for their transactions and counterparties are subject to change. New counterparties can be added at anytime.