COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning of period	$ 660
Accruals for environmental matters deemed probable and reasonably estimable	126
Environmental liability payments	(147)
End of period	639
Loss Contingency, Classification of Accrual [Abstract]
Accrued liabilities	225	$ 225
Other liabilities	414	435
Total environmental liabilities	$ 639	$ 660