ASSET RETIREMENT OBLIGATIONS Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2015

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Change in Asset Retirement Obligation

The following table is a reconciliation of the carrying amount of the ARO liability reflected as liabilities on our balance sheet for the periods presented.  Changes in assumptions regarding the timing, amount, and probabilities associated with the expected cash flows, as well as the difference in actual versus estimated costs, will result in a change in the amount of the liability recognized.

	Years Ended December 31,
	2015			2014			2013
Beginning balance	$	58		$	55		$	46
Revisions	—			3			11
Settled	(3		)	(3		)	(1		)
Disposals	—			—			(4		)
Accretion expense	3			3			3
Ending balance	$	58		$	58		$	55