ENVIRONMENTAL MATTERS AND ASSET RETIREMENT OBLIGATIONS (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2018	Dec. 31, 2017
Site Contingency [Line Items]
Portion Of Environmental Reserve Related To Previously Closed, Impaired, And Divested Sites	$ 7	$ 7
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning of period	304
End of period	301
Accrual for Environmental Loss Contingencies, Balance Sheet Classification [Abstract]
Accrued Environmental Loss Contingencies, Current	25	25
Accrued Environmental Loss Contingencies, Noncurrent	276	279
Environmental Remediation [Member]
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning of period	280
Changes in estimates recognized in earnings and other	5
Cash reductions	(9)
End of period	$ 276
Expected Payment Period of Environmental Contingencies	approximately 30 years
Environmental Remediation [Member] \| Minimum [Member]
Site Contingency [Line Items]
Loss Contingency, Estimate of Possible Loss	$ 276	280
Environmental Remediation [Member] \| Maximum [Member]
Site Contingency [Line Items]
Loss Contingency, Estimate of Possible Loss	517	483
Environmental ARO [Member]
Site Contingency [Line Items]
Best Estimate Accrued to-date For Asset Retirement Obligation	25	24
Non Environmental ARO [Member]
Site Contingency [Line Items]
Best Estimate Accrued to-date For Asset Retirement Obligation	$ 45	$ 49

Expected period over which payments for aggregated environmental contingent liabilities will be paid.

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

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Amount of expense (reversal of expense) which increases (decreases) the accrual for environmental loss contingencies from revisions in estimates to existing obligations. Excludes changes related to business acquisitions, divestitures, or currency movement.

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Amount of cash outflow to settle environmental loss contingencies.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable in twelve months or in the next operating cycle if longer.

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Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable after twelve months or beyond the next operating cycle if longer.

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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.

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Carrying amount as of the balance sheet date of the liability for remediation, site restoration, postclosure, monitoring commitments, or other exit costs associated with the sale, disposal or abandonment of a particular property resulting from unanticipated contamination of the assets.

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Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

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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.

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