Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2016	Feb. 24, 2017	Jun. 30, 2016
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	FY
Entity Registrant Name	ProShares Trust II
Entity Central Index Key	0001415311
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		0
Entity Public Float			$ 0
ProShares VIX Short-Term Futures ETF [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		9,859,451
Entity Public Float			193,732,260
ProShares VIX Mid-Term Futures ETF [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		1,112,403
Entity Public Float			42,675,530
ProShares Short VIX Short-Term Futures ETF [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		2,150,000
Entity Public Float			677,028,000
ProShares Ultra VIX Short-Term Futures ETF [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		20,277,809
Entity Public Float			867,583,104
ProShares UltraShort Bloomberg Crude Oil [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		7,839,884
Entity Public Float			164,867,666
ProShares UltraShort Bloomberg Natural Gas [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		224,832
Entity Public Float			2,548,778
ProShares UltraShort Gold [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		446,977
Entity Public Float			55,788,460
ProShares UltraShort Silver [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		616,976
Entity Public Float			30,604,790
ProShares Short Euro [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		350,000
Entity Public Float			17,124,000
ProShares UltraShort Australian Dollar [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		300,000
Entity Public Float			18,714,500
ProShares UltraShort Euro [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		11,900,000
Entity Public Float			386,688,000
ProShares UltraShort Yen [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		3,499,290
Entity Public Float			193,721,394
ProShares Ultra Bloomberg Crude Oil [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		34,011,317
Entity Public Float			902,787,523
ProShares Ultra Bloomberg Natural Gas [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		4,642,169
Entity Public Float			43,104,283
ProShares Ultra Gold [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		2,750,000
Entity Public Float			101,317,500
ProShares Ultra Silver [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		8,096,526
Entity Public Float			405,029,394
ProShares Ultra Euro [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		900,000
Entity Public Float			9,516,000
ProShares Ultra Yen [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		99,970
Entity Public Float			$ 7,268,819