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CONTRACTS AND AGREEMENTS - Additional Information (Details) $ in Billions	12 Months Ended
	Dec. 31, 2021 USD ($) $ / item
Maximum [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Commissions per round-turn trade, including applicable exchange and NFA fees for Oil Futures Contracts and options on Oil Futures Contracts \| $ / item	8
Minimum [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Commissions per round-turn trade, including applicable exchange and NFA fees for Oil Futures Contracts and options on Oil Futures Contracts \| $ / item	7
Marketing Agreement \| Maximum [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Fee percentage	10.00%
Marketing Agreement \| USL's assets up to $3 billion
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Fee percentage	0.06%
Marketing Agreement \| USL's assets up to $3 billion \| Minimum [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Base amount for determining fee percentage \| $	$ 3
Marketing Agreement \| USL's assets in excess of $3 billion
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Fee percentage	0.04%
Marketing Agreement \| USL's assets in excess of $3 billion \| Minimum [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Base amount for determining fee percentage \| $	$ 3