ASSET IMPAIRMENTS - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Property, Plant and Equipment [Line Items]
Asset impairments	$ 25	$ 0	$ 28	$ 1,736
Capitalized cost			3
Proved oil and natural gas properties	0	0	0	1,487
Unproved properties	0	$ 0	0	$ 228
Bakersfield Office Building
Property, Plant and Equipment [Line Items]
Asset impairments	$ 25		$ 25