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CONTRACTS AND AGREEMENTS (Additional Information) (Details)
 12 Months Ended
Dec. 31, 2016
USD ($)
$ / Contracts
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]  
Annual Fee for transfer agency services $ 20,000
Maximum  
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]  
Annual Fee for transfer agency services 75,000
Transaction fees per transaction $ 15
Commissions per round-turn trade, including applicable exchange and NFA fees for Oil Futures Contracts and options on Oil Futures Contracts | $ / Contracts 8
Minimum  
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]  
Annual Fee for transfer agency services $ 75,000
Transaction fees per transaction $ 7
Commissions per round-turn trade, including applicable exchange and NFA fees for Oil Futures Contracts and options on Oil Futures Contracts | $ / Contracts 7
First $500 million of USL's, USOF's, USNG's, UGA's, USDHO's, USSO's, US12NG's, USBO's, USCI's, CPER's, USAG's and USMI's combined net assets  
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]  
Fee percentage 0.06%
Base amount for determining fee percentage $ 500,000,000
USL's, USOF's, USNG's, UGA's, USDHO's, USSO's, US12NG's, USBO's, USCI's, CPER's, USAG's and USMI's combined net assets greater than $500 million but less than $1 billion  
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]  
Fee percentage 0.0465%
USL's, USOF's, USNG's, UGA's, USDHO's, USSO's, US12NG's, USBO's, USCI's, CPER's, USAG's and USMI's combined net assets greater than $500 million but less than $1 billion | Maximum  
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]  
Base amount for determining fee percentage $ 1,000,000,000
USL's, USOF's, USNG's, UGA's, USDHO's, USSO's, US12NG's, USBO's, USCI's, CPER's, USAG's and USMI's combined net assets greater than $500 million but less than $1 billion | Minimum  
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]  
Base amount for determining fee percentage $ 500,000,000
USL's, USOF's, USNG's, UGA's, USDHO's, USSO's, US12NG's, USBO's, USCI's, CPER's, USAG's and USMI's combined net assets exceed $1 billion  
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]  
Fee percentage 0.035%
Base amount for determining fee percentage $ 1,000,000,000
Marketing Agreement | Maximum  
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  
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]  
Base amount for determining fee percentage $ 3,000,000,000
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 | Maximum  
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]  
Base amount for determining fee percentage $ 3,000,000,000