INCOME TAXES - RECONCILIATION OF UNRECOGNIZED TAX BENEFITS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance, at beginning of period	$ 2,045	$ 2,173	$ 0
Increase related to Anadarko Acquisition	0	0	2,143
Increases related to prior-year positions	75	14	30
Settlements	(80)	(42)	0
Reductions for tax positions of prior years	(14)	(100)	0
Balance, at end of period	$ 2,026	$ 2,045	$ 2,173