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CONTRACTS AND AGREEMENTS (Details)
$ in Billions
 12 Months Ended
Sep. 30, 2023
USD ($)
Oct. 01, 2022
Dec. 31, 2023
$ / item
Maximum      
CONTRACTS AND AGREEMENTS      
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      
CONTRACTS AND AGREEMENTS      
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      
CONTRACTS AND AGREEMENTS      
Fee percentage 0.06%    
Base amount for determining fee percentage | $ $ 3    
Marketing Agreement | USNG's assets in excess of $3 billion      
CONTRACTS AND AGREEMENTS      
Fee percentage     10.00%
Percentage of total net assets   0.025%  
Marketing Agreement | USNG's assets in excess of $3 billion | Minimum      
CONTRACTS AND AGREEMENTS      
Fee percentage 0.04%    
Base amount for determining fee percentage | $ $ 3