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ORGANIZATION AND BUSINESS (Additional Information) (Details) (USD $)	1 Months Ended		12 Months Ended
	Nov. 30, 2009	Nov. 18, 2009	Dec. 31, 2014 Contracts	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets			$ 350unl_FeePaidPerOrder
Number of initially registered units on Form S-1 with the U.S. Securities and Exchange Commission	30,000,000unl_NumberOfUnitsRegisteredInPeriod
Net asset value per share		$ 50.00unl_NetAssetValuePerUnit	$ 13.69unl_NetAssetValuePerUnit	$ 18.32unl_NetAssetValuePerUnit	$ 17.23unl_NetAssetValuePerUnit	$ 21.21unl_NetAssetValuePerUnit	$ 21.21unl_NetAssetValuePerUnit
Number of units issued		200,000
Value of unit issued		10,000,000
Commenced investment operations date	Nov. 18, 2009
Number of registered units			25,600,000unl_NumberOfRegisteredUnits
Derivative, Number of Instruments Held			537
Creation Baskets [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of units per basket			50,000
Prior to July 1, 2011 [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets			$ 1,000