FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS	6 Months Ended
Jun. 30, 2013
Fees Paid By Fund and Related Party Transactions [Abstract]
Fees Paid by the Fund and Related Party Transactions	NOTE 3 — FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS USCF Management Fee Under the LP Agreement, USCF is responsible for investing the assets of US12NG in accordance with the objectives and policies of US12NG. In addition, USCF has arranged for one or more third parties to provide administrative, custody, accounting, transfer agency and other necessary services to US12NG. For these services, US12NG is contractually obligated to pay USCF a fee, which is paid monthly, equal to 0.75% per annum of average daily total net assets. Ongoing Registration Fees and Other Offering Expenses US12NG pays all costs and expenses associated with the ongoing registration of its units subsequent to the initial offering. These costs include registration or other fees paid to regulatory agencies in connection with the offer and sale of units, and all legal, accounting, printing and other expenses associated with such offer and sale. For the six months ended June 30, 2013 and 2012, US12NG did not incur any registration fees or other offering expenses. Directors’ Fees and Expenses US12NG is responsible for paying its portion of the directors’ and officers’ liability insurance for US12NG and the Related Public Funds and the fees and expenses of the independent directors who also serve as audit committee members of US12NG and the Related Public Funds organized as limited partnerships and, as of July 8, 2011, the Related Public Funds organized as a series of a Delaware statutory trust. US12NG shares the fees and expenses on a pro rata basis with each Related Public Fund, as described above, based on the relative assets of each fund computed on a daily basis. These fees and expenses for the year ending December 31, 2013 are estimated to be a total of $560,625 for US12NG and the Related Public Funds. Licensing Fees As discussed in Note 4 below, US12NG entered into a licensing agreement with the NYMEX on December 4, 2007, as amended on October 20, 2011. Pursuant to the agreement, through October 19, 2011, US12NG and the Related Public Funds, other than USBO, USCI, CPER, USAG and USMI, paid a licensing fee that was equal to 0.04% for the first $1,000,000,000 of combined net assets of the funds and 0.02% for combined net assets above $1,000,000,000. On and after October 20, 2011, US12NG and the Related Public Funds, other than USBO, USCI, CPER, USAG and USMI, pay a licensing fee that is equal to 0.015% on all net assets. During the six months ended June 30, 2013 and 2012, US12NG incurred $2,949 and $2,120, respectively, under this arrangement. Investor Tax Reporting Cost The fees and expenses associated with US12NG’s audit expenses and tax accounting and reporting requirements are paid by US12NG. These costs are estimated to be $125,000 for the year ending December 31, 2013. Other Expenses and Fees and Expense Waivers In addition to the fees described above, US12NG pays all brokerage fees and other expenses in connection with the operation of US12NG, excluding costs and expenses paid by USCF as outlined in Note 4 below. USCF has voluntarily agreed to pay certain expenses normally borne by US12NG to the extent that such expenses exceed 0.15% (15 basis points) of US12NG’s NAV, on an annualized basis, through at least December 31, 2013. USCF has no obligation to continue such payments into subsequent periods. For the six months ended June 30, 2013, USCF waived $32,787 of US12NG’s expenses. This voluntary expense waiver is in addition to those amounts USCF is contractually obligated to pay as described in Note 4.

NOTE 3 — FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS

USCF Management Fee

Under the LP Agreement, USCF is responsible for investing the assets of US12NG in accordance with the objectives and policies of US12NG. In addition, USCF has arranged for one or more third parties to provide administrative, custody, accounting, transfer agency and other necessary services to US12NG. For these services, US12NG is contractually obligated to pay USCF a fee, which is paid monthly, equal to 0.75% per annum of average daily total net assets.

Ongoing Registration Fees and Other Offering Expenses

US12NG pays all costs and expenses associated with the ongoing registration of its units subsequent to the initial offering. These costs include registration or other fees paid to regulatory agencies in connection with the offer and sale of units, and all legal, accounting, printing and other expenses associated with such offer and sale. For the six months ended June 30, 2013 and 2012, US12NG did not incur any registration fees or other offering expenses.

Directors’ Fees and Expenses

US12NG is responsible for paying its portion of the directors’ and officers’ liability insurance for US12NG and the Related Public Funds and the fees and expenses of the independent directors who also serve as audit committee members of US12NG and the Related Public Funds organized as limited partnerships and, as of July 8, 2011, the Related Public Funds organized as a series of a Delaware statutory trust. US12NG shares the fees and expenses on a pro rata basis with each Related Public Fund, as described above, based on the relative assets of each fund computed on a daily basis. These fees and expenses for the year ending December 31, 2013 are estimated to be a total of $560,625 for US12NG and the Related Public Funds.

Licensing Fees

As discussed in Note 4 below, US12NG entered into a licensing agreement with the NYMEX on December 4, 2007, as amended on October 20, 2011. Pursuant to the agreement, through October 19, 2011, US12NG and the Related Public Funds, other than USBO, USCI, CPER, USAG and USMI, paid a licensing fee that was equal to 0.04% for the first $1,000,000,000 of combined net assets of the funds and 0.02% for combined net assets above $1,000,000,000. On and after October 20, 2011, US12NG and the Related Public Funds, other than USBO, USCI, CPER, USAG and USMI, pay a licensing fee that is equal to 0.015% on all net assets. During the six months ended June 30, 2013 and 2012, US12NG incurred $2,949 and $2,120, respectively, under this arrangement.

Investor Tax Reporting Cost

The fees and expenses associated with US12NG’s audit expenses and tax accounting and reporting requirements are paid by US12NG. These costs are estimated to be $125,000 for the year ending December 31, 2013.

Other Expenses and Fees and Expense Waivers

In addition to the fees described above, US12NG pays all brokerage fees and other expenses in connection with the operation of US12NG, excluding costs and expenses paid by USCF as outlined in Note 4 below. USCF has voluntarily agreed to pay certain expenses normally borne by US12NG to the extent that such expenses exceed 0.15% (15 basis points) of US12NG’s NAV, on an annualized basis, through at least December 31, 2013. USCF has no obligation to continue such payments into subsequent periods. For the six months ended June 30, 2013, USCF waived $32,787 of US12NG’s expenses. This voluntary expense waiver is in addition to those amounts USCF is contractually obligated to pay as described in Note 4.