SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ASSET RETIREMENT OBLIGATIONS (Details) - USD ($) $ in Millions |
Dec. 31, 2017 |
Dec. 31, 2016 |
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| ASSET RETIREMENT OBLIGATIONS | 听 | 听 |
| Asset retirement obligations | $ 9 | $ 8 |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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