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ENVIRONMENTAL MATTERS - Narrative (Details) $ in Millions | Dec. 31, 2020 USD ($) site | Dec. 31, 2019 USD ($)
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Environmental Remediation Obligations [Abstract] |  |
Number of disposal sites | site | 22 |
Asset retirement obligations | $ | $ 27 | $ 28

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- Definition Number of disposal sites. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- References No definition available. + Details
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