Statements of Changes in Shareholders' Equity (Parenthetical) - shares	12 Months Ended
	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Addition, shares	191,098,000	[1]	119,309,700	[2]	78,857,360
Redemption, shares	176,102,185	[1]	94,955,635	[2]	86,585,739
Net addition (redemption), shares	14,995,815	[1]	24,354,065	[2]	(7,728,379)
ProShares VIX Short-Term Futures ETF [Member]
Addition, shares	12,265,000		2,495,000		2,115,000
Redemption, shares	5,645,511		1,970,000		2,945,000
Net addition (redemption), shares	6,619,489		525,000		(830,000)
ProShares VIX Mid-Term Futures ETF [Member]
Addition, shares	1,100,000		325,000		593,750
Redemption, shares	525,001		150,000		918,847
Net addition (redemption), shares	574,999		175,000		(325,097)
ProShares Short VIX Short-Term Futures ETF [Member]
Addition, shares	52,950,000		24,100,000		16,100,000
Redemption, shares	63,100,040		19,700,000		9,950,000
Net addition (redemption), shares	(10,150,040)		4,400,000		6,150,000
ProShares Ultra VIX Short-Term Futures ETF [Member]
Addition, shares	28,958,000		2,887,200		408,600
Redemption, shares	17,876,568		2,219,263		323,418
Net addition (redemption), shares	11,081,432		667,937		85,182
ProShares UltraShort Bloomberg Crude Oil [Member]
Addition, shares	18,500,000		21,600,000		31,400,000
Redemption, shares	13,600,004		24,500,000		43,200,000
Net addition (redemption), shares	4,899,996		(2,900,000)		(11,800,000)
ProShares UltraShort Bloomberg Natural Gas [Member]
Addition, shares	950,000		1,350,000		8,550,000
Redemption, shares	1,000,024		1,650,000		9,000,000
Net addition (redemption), shares	(50,024)		(300,000)		(450,000)
ProShares UltraShort Gold [Member]
Addition, shares	1,050,000		150,000		550,000
Redemption, shares	1,000,000		350,000		1,050,000
Net addition (redemption), shares	50,000		(200,000)		(500,000)
ProShares UltraShort Silver [Member]
Addition, shares	1,650,000		1,650,000		1,800,000
Redemption, shares	1,900,002		1,700,000		3,400,000
Net addition (redemption), shares	(250,002)		(50,000)		(1,600,000)
ProShares Short Euro [Member]
Addition, shares	50,000		550,000		250,000
Redemption, shares	100,005		500,000		150,000
Net addition (redemption), shares	(50,005)		50,000		100,000
ProShares UltraShort Australian Dollar [Member]
Addition, shares	0		50,000		0
Redemption, shares	50,005		150,000		150,000
Net addition (redemption), shares	(50,005)		(100,000)		(150,000)
ProShares UltraShort Euro [Member]
Addition, shares	650,000		12,600,000		4,500,000
Redemption, shares	8,200,014		16,100,000		5,050,000
Net addition (redemption), shares	(7,550,014)		(3,500,000)		(550,000)
ProShares UltraShort Yen [Member]
Addition, shares	2,300,000		1,350,000		2,850,000
Redemption, shares	1,550,004		4,600,000		5,200,000
Net addition (redemption), shares	749,996		(3,250,000)		(2,350,000)
ProShares Ultra Bloomberg Crude Oil [Member]
Addition, shares	62,875,000		43,415,000		5,040,000
Redemption, shares	54,025,001		16,690,983		1,045,000
Net addition (redemption), shares	8,849,999		26,724,017		3,995,000
ProShares Ultra Bloomberg Natural Gas [Member]
Addition, shares	3,450,000		2,137,500		1,437,500
Redemption, shares	3,250,001		1,187,815		700,000
Net addition (redemption), shares	199,999		949,685		737,500
ProShares Ultra Gold [Member]
Addition, shares	1,050,000		150,000		300,000
Redemption, shares	600,014		350,000		950,000
Net addition (redemption), shares	449,986		(200,000)		(650,000)
ProShares Ultra Silver [Member]
Addition, shares	2,800,000		2,700,000		2,487,500
Redemption, shares	2,550,007		2,100,000		2,440,974
Net addition (redemption), shares	249,993		600,000		46,526
ProShares Ultra Euro [Member]
Addition, shares	300,000		350,000		50,000
Redemption, shares	150,014		400,000		0
Net addition (redemption), shares	149,986		550,000		50,000
ProShares Ultra Yen [Member]
Addition, shares	0		75,000		12,500
Redemption, shares	4		12,530		12,500
Net addition (redemption), shares	(4)		62,470		0

[1] The operations include the activity of: ProShares Managed Futures Strategy through March 30, 2016, and ProShares UltraShort Bloomberg Commodity and ProShares Ultra Bloomberg Commodity through September 1, 2016, the date of liquidation, respectively. See Note 1.

[2] The operations include the activity of ProShares Ultra Australian Dollar through June 29, 2015, the date of liquidation, respectively. See Note 1.