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ENVIRONMENTAL MATTERS AND ASSET RETIREMENT OBLIGATIONS (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning of period	$ 296
End of period	290	$ 296
Accrual for Environmental Loss Contingencies, Balance Sheet Classification [Abstract]
Accrued Environmental Loss Contingencies, Current	20	25
Accrued Environmental Loss Contingencies, Noncurrent	270	271
Environmental Remediation [Member]
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning of period	271	280
Changes in estimates recognized in earnings and other	3	7
Cash reductions	(11)	(16)
End of period	$ 263	271
Expected Payment Period of Environmental Contingencies	approximately 30 years
Environmental Remediation [Member] | Minimum [Member]
Site Contingency [Line Items]
Loss Contingency, Estimate of Possible Loss	$ 263	271
Environmental Remediation [Member] | Maximum [Member]
Site Contingency [Line Items]
Loss Contingency, Estimate of Possible Loss	492	508
Environmental ARO [Member]
Site Contingency [Line Items]
Best Estimate Accrued to-date For Asset Retirement Obligation	27	25
Non Environmental ARO [Member]
Site Contingency [Line Items]
Best Estimate Accrued to-date For Asset Retirement Obligation	$ 47	$ 46

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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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