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CONTRACTS AND AGREEMENTS - Additional Information (Details) $ in Billions			12 Months Ended
	Oct. 01, 2022	Sep. 30, 2022 USD ($)	Dec. 31, 2022 $ / item
Maximum
Contracts and Agreements
Commissions per round-turn trade, including applicable exchange and NFA fees for natural gas-related futures contracts and options on futures contracts | $ / item			8
Minimum
Contracts and Agreements
Commissions per round-turn trade, including applicable exchange and NFA fees for natural gas-related futures contracts and options on futures contracts | $ / item			7
Marketing Agent and Affiliate Of USCF
Contracts and Agreements
Maximum aggregate compensation paid for distribution related services			10.00%
Marketing Agreement
Contracts and Agreements
Percentage of total net assets	0.025%
Marketing Agreement | UNL's assets up to $3 billion
Contracts and Agreements
Fee percentage		0.06%
Base amount for determining fee percentage | $		$ 3
Marketing Agreement | UNL's assets in excess of $3 billion
Contracts and Agreements
Fee percentage		0.04%
Base amount for determining fee percentage | $		$ 3

X

- Definition

Percentage of base fee.

+ References

No definition available.

+ Details

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Namespace Prefix:	unl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of base fee.

+ References

No definition available.

+ Details

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Namespace Prefix:	unl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of commissions paid.

+ References

No definition available.

+ Details

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Namespace Prefix:	unl_
Data Type:	srt-types:perUnitItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maximum percentage of gross proceeds from offering paid for distribution related services as compensation.

+ References

No definition available.

+ Details

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Namespace Prefix:	unl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

It represents the Percentage of total net assets.

+ References

No definition available.

+ Details

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Namespace Prefix:	unl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

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

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X

- Details

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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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X

- Details

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Period Type:

X

- Details

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