v3.22.2

Schedule of Investments - Foreign Currency Forward Contracts (Detail) - 6 months ended Jun. 30, 2022 - Foreign Currency Forward Contracts [Member]		USD ($)	EUR (€)	JPY (¥)
ProShares Ultra Euro [Member] | Euro Contract [Member] | Contracts to Purchase [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)/Value	[1]	$ (350,034)
ProShares Ultra Euro [Member] | Euro Contract [Member] | Contracts to Purchase [Member] | Goldman Sachs International [Member]
Schedule of Investments [Line Items]
Settlement Date	[1]	Jul. 08, 2022
Contract to Purchase	[1]	$ 4,750,259	€ 4,532,921
Unrealized Appreciation (Depreciation)/Value	[1]	$ (123,538)
ProShares Ultra Euro [Member] | Euro Contract [Member] | Contracts to Purchase [Member] | UBS AG [Member]
Schedule of Investments [Line Items]
Settlement Date	[1]	Jul. 08, 2022
Contract to Purchase	[1]	$ 15,547,860	14,836,502
Unrealized Appreciation (Depreciation)/Value	[1]	(226,496)
ProShares Ultra Euro [Member] | Euro Contract [Member] | Contracts to Sell [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)/Value	[1]	$ 17,639
ProShares Ultra Euro [Member] | Euro Contract [Member] | Contracts to Sell [Member] | UBS AG [Member]
Schedule of Investments [Line Items]
Settlement Date	[1]	Jul. 08, 2022
Contract to Sell	[1]	$ (1,515,331)	(1,446,000)
Unrealized Appreciation (Depreciation)/Value	[1]	17,639
ProShares Ultra Yen [Member] | Yen Contract [Member] | Contracts to Purchase [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)/Value	[1]	$ (79,162)
ProShares Ultra Yen [Member] | Yen Contract [Member] | Contracts to Purchase [Member] | Goldman Sachs International [Member]
Schedule of Investments [Line Items]
Settlement Date	[1]	Jul. 08, 2022
Contract to Purchase	[1]	$ 2,456,755		¥ 333,241,517
Unrealized Appreciation (Depreciation)/Value	[1]	$ (34,398)
ProShares Ultra Yen [Member] | Yen Contract [Member] | Contracts to Purchase [Member] | UBS AG [Member]
Schedule of Investments [Line Items]
Settlement Date	[1]	Jul. 08, 2022
Contract to Purchase	[1]	$ 7,968,387		1,080,855,856
Unrealized Appreciation (Depreciation)/Value	[1]	(44,764)
ProShares Ultra Yen [Member] | Yen Contract [Member] | Contracts to Sell [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)/Value	[1]	$ 2,012
ProShares Ultra Yen [Member] | Yen Contract [Member] | Contracts to Sell [Member] | UBS AG [Member]
Schedule of Investments [Line Items]
Settlement Date	[1]	Jul. 08, 2022
Contract to Sell	[1]	$ (399,357)		(54,170,000)
Unrealized Appreciation (Depreciation)/Value	[1]	2,012
ProShares UltraShort Euro [Member] | Euro Contract [Member] | Contracts to Purchase [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)/Value	[1]	$ (187,210)
ProShares UltraShort Euro [Member] | Euro Contract [Member] | Contracts to Purchase [Member] | Goldman Sachs International [Member]
Schedule of Investments [Line Items]
Settlement Date	[1]	Jul. 08, 2022
Contract to Purchase	[1]	$ 12,659,194	12,080,000
Unrealized Appreciation (Depreciation)/Value	[1]	$ (101,019)
ProShares UltraShort Euro [Member] | Euro Contract [Member] | Contracts to Purchase [Member] | UBS AG [Member]
Schedule of Investments [Line Items]
Settlement Date	[1]	Jul. 08, 2022
Contract to Purchase	[1]	$ 12,638,235	12,060,000
Unrealized Appreciation (Depreciation)/Value	[1]	(86,191)
ProShares UltraShort Euro [Member] | Euro Contract [Member] | Contracts to Sell [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)/Value		$ 3,382,293
ProShares UltraShort Euro [Member] | Euro Contract [Member] | Contracts to Sell [Member] | Goldman Sachs International [Member]
Schedule of Investments [Line Items]
Settlement Date	[1]	Jul. 08, 2022
Contract to Sell	[1]	$ (54,110,993)	(51,635,263)
Unrealized Appreciation (Depreciation)/Value	[1]	$ 1,346,162
ProShares UltraShort Euro [Member] | Euro Contract [Member] | Contracts to Sell [Member] | UBS AG [Member]
Schedule of Investments [Line Items]
Settlement Date	[1]	Jul. 08, 2022
Contract to Sell	[1]	$ (95,875,786)	€ (91,489,199)
Unrealized Appreciation (Depreciation)/Value		2,036,131
ProShares UltraShort Yen [Member] | Yen Contract [Member] | Contracts to Purchase [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)/Value	[1]	$ (156,206)
ProShares UltraShort Yen [Member] | Yen Contract [Member] | Contracts to Purchase [Member] | UBS AG [Member]
Schedule of Investments [Line Items]
Settlement Date	[1]	Jul. 08, 2022
Contract to Purchase	[1]	$ 11,096,632		1,505,180,000
Unrealized Appreciation (Depreciation)/Value	[1]	(156,206)
ProShares UltraShort Yen [Member] | Yen Contract [Member] | Contracts to Sell [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation (Depreciation)/Value	[1]	$ 1,127,711
ProShares UltraShort Yen [Member] | Yen Contract [Member] | Contracts to Sell [Member] | Goldman Sachs International [Member]
Schedule of Investments [Line Items]
Settlement Date	[1]	Jul. 08, 2022
Contract to Sell	[1]	$ (12,226,680)		(1,658,463,165)
Unrealized Appreciation (Depreciation)/Value	[1]	$ 164,849
ProShares UltraShort Yen [Member] | Yen Contract [Member] | Contracts to Sell [Member] | UBS AG [Member]
Schedule of Investments [Line Items]
Settlement Date	[1]	Jul. 08, 2022
Contract to Sell	[1]	$ (89,993,668)		¥ (12,207,008,574)
Unrealized Appreciation (Depreciation)/Value	[1]	$ 962,862
[1] The positions and counterparties herein are as of June 30, 2022. The Fund continually evaluates different counterparties for their transactions and counterparties are subject to change. New counterparties can be added at any time.

X

- Definition

Nominal or face amount used to calculate payments on the derivative asset.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

+ Details

Name:	us-gaap_DerivativeAssetNotionalAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Nominal or face amount used to calculate payments on the derivative liability.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

+ Details

Name:	us-gaap_DerivativeLiabilityNotionalAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Date the derivative contract matures, in YYYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeMaturityDates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This element represents the net excess or deficiency of the fair value of an investment (security, contract) over or under its cost (face amount, notional amount), respectively, which excess value or deficiency has not been recognized in earnings of the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 22
-URI https://asc.fasb.org/extlink&oid=122147990&loc=SL6090603-123010

+ Details

Name:	us-gaap_InvestmentOwnedUnrecognizedUnrealizedAppreciationDepreciationNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ScheduleOfInvestmentsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_ForeignExchangeForwardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesUltraEuroMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ck0001415311_InvestmentsHoldingAxis=ck0001415311_EuroContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PositionAxis=us-gaap_LongMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_CounterpartyNameAxis=ck0001415311_GoldmanSachsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_CounterpartyNameAxis=ck0001415311_UbsAgMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PositionAxis=us-gaap_ShortMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesUltraYenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ck0001415311_InvestmentsHoldingAxis=ck0001415311_YenContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesUltraShortEuroMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=ck0001415311_ProsharesUltraShortYenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: