COMMITMENTS AND CONTINGENCIES (Details) $ in Millions, $ in Millions				1 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended
	Sep. 11, 2019 USD ($) plaintiff	Dec. 20, 2017 Action	Jul. 17, 2017 Action defendant	Dec. 31, 2017 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Apr. 30, 2017 AUD ($)
Commitment And Contingencies [Line Items]
Accrued liability for legal contingencies					$ 19	$ 19
Undiscounted reserve for environmental remediation					2	2
Apollo Exploration Lawsuit
Commitment And Contingencies [Line Items]
Plaintiffs alleged damages						200	$ 1,100
Australian Operations Divestiture Dispute | Apache Australia Operation
Commitment And Contingencies [Line Items]
Plaintiffs alleged damages				$ 200
Gain contingency, unrecorded amount								$ 80
Canadian Operations Divestiture Dispute
Commitment And Contingencies [Line Items]
Plaintiffs alleged damages	$ 60
Number of plaintiffs | plaintiff	4
California Litigation
Commitment And Contingencies [Line Items]
Number of actions filed | Action		2	3
Number of defendants | defendant			30
Castex Lawsuit
Commitment And Contingencies [Line Items]
Plaintiffs alleged damages					200
Loss contingency, estimated of possible loss amount					$ 60	60
Oklahoma Class Actions
Commitment And Contingencies [Line Items]
Plaintiffs alleged damages						$ 200