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ENVIRONMENTAL MATTERS AND ASSET RETIREMENT OBLIGATIONS (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning of period	$ 285
End of period	284	$ 285
Accrual for Environmental Loss Contingencies, Balance Sheet Classification [Abstract]
Accrued Environmental Loss Contingencies, Current	20	15
Accrued Environmental Loss Contingencies, Noncurrent	264	270
Environmental Remediation [Member]
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning of period	257	260
Changes in estimates recognized in earnings and other	8	7
Cash reductions	(9)	(10)
End of period	$ 256	257
Expected Payment Period of Environmental Contingencies	approximately 30 years
Environmental Remediation [Member] | Minimum [Member]
Site Contingency [Line Items]
Loss Contingency, Estimate of Possible Loss	$ 256	257
Environmental Remediation [Member] | Maximum [Member]
Site Contingency [Line Items]
Loss Contingency, Estimate of Possible Loss	478	501
Environmental ARO [Member]
Site Contingency [Line Items]
Best Estimate Accrued to-date For Asset Retirement Obligation	28	28
Non Environmental ARO [Member]
Site Contingency [Line Items]
Best Estimate Accrued to-date For Asset Retirement Obligation	$ 52	$ 51

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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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