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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Property, Plant and Equipment) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Building |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant, equipment and mine development, useful life | 39 years |  |
Machinery and equipment | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant, equipment and mine development, useful life | 3 years |  |
Machinery and equipment | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant, equipment and mine development, useful life | 30 years |  |
Mobile equipment | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant, equipment and mine development, useful life | 3 years |  |
Mobile equipment | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant, equipment and mine development, useful life | 30 years |  |
United States oil and gas operations |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Interest Costs Capitalized |  | $ 7 | $ 58
United States oil and gas operations | Oil and Gas Properties [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Interest Costs Capitalized |  | $ 7 | $ 58

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- Definition Amount of interest capitalized during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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