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CONTRACTS AND AGREEMENTS - Additional Information (Details)
$ in Billions
 6 Months Ended
Jun. 30, 2022
USD ($)
$ / item
Maximum  
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]  
Commissions per round-turn trade, including applicable exchange and NFA fees for Futures Contracts and options on Futures Contracts | $ / item 8
Percentage of flat fee 0.30%
Minimum  
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]  
Commissions per round-turn trade, including applicable exchange and NFA fees for Futures Contracts and options on Futures Contracts | $ / item 7
Percentage of flat fee 0.20%
Marketing Agreement | USNG's assets up to $3 billion  
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]  
Fee percentage 0.06%
Base amount for determining fee percentage | $ $ 3
Marketing Agreement | USNG's assets in excess of $3 billion  
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]  
Fee percentage 10.00%
Marketing Agreement | USNG's assets in excess of $3 billion | Minimum  
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]  
Fee percentage 0.04%
Base amount for determining fee percentage | $ $ 3