COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning of period	$ 660
Accruals for environmental matters deemed probable and reasonably estimable	41
Environmental liability payments	(79)
Other	1
End of period	623
Loss Contingency, Classification of Accrual [Abstract]
Accrued liabilities		$ 225	$ 225
Other liabilities		398	435
Total environmental liabilities	$ 660	$ 623	$ 660