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FAIR VALUE OF FINANCIAL INSTRUMENTS - Valuation of Securities Using Fair Value Hierarchy (Details) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Schedule of Trading Securities and Other Trading Assets
transfers between Level I and Level II.	$ 0	$ 0
transfers between Level II and Level I.	0	0
Short-Term Investments
Schedule of Trading Securities and Other Trading Assets
Securities, fair value	1,358,772,491	1,334,416,220
United States | Exchange-Traded Futures Contracts
Schedule of Trading Securities and Other Trading Assets
Securities, fair value	(66,680,740)	(194,392,958)
Fair Value, Inputs, Level 1 | Short-Term Investments
Schedule of Trading Securities and Other Trading Assets
Securities, fair value	1,358,772,491	1,334,416,220
Fair Value, Inputs, Level 1 | United States | Exchange-Traded Futures Contracts
Schedule of Trading Securities and Other Trading Assets
Securities, fair value	(66,680,740)	(194,392,958)
Fair Value, Inputs, Level 2 | Short-Term Investments
Schedule of Trading Securities and Other Trading Assets
Securities, fair value	0	0
Fair Value, Inputs, Level 2 | United States | Exchange-Traded Futures Contracts
Schedule of Trading Securities and Other Trading Assets
Securities, fair value	0	0
Fair Value, Inputs, Level 3 | Short-Term Investments
Schedule of Trading Securities and Other Trading Assets
Securities, fair value	0	0
Fair Value, Inputs, Level 3 | United States | Exchange-Traded Futures Contracts
Schedule of Trading Securities and Other Trading Assets
Securities, fair value	$ 0	$ 0

X

- Definition

Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bb)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
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