COMMITMENTS AND CONTINGENCIES - Additional Information (Details) $ in Millions							12 Months Ended
	Sep. 10, 2020 defendant	Sep. 11, 2019 USD ($) plaintiff	Dec. 20, 2017 Action	Jul. 17, 2017 Action defendant	Mar. 21, 2016 USD ($)	Mar. 20, 2016 USD ($)	Dec. 31, 2020 USD ($) Action	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2013 USD ($)	Aug. 03, 2020 USD ($)	Dec. 31, 2017 AUD ($)	Apr. 30, 2017 AUD ($)	Mar. 12, 2014 USD ($)
Commitment And Contingencies [Line Items]
Accrued liability for legal contingencies							$ 70,000,000
Environmental tax and royalty obligations														$ 100,000,000
Retain right of obligations							45,000,000
Number of plaintiffs | plaintiff		4
Maximum cost considered to be recognized for additional reserve							300,000
Undiscounted reserve for environmental remediation							2,000,000
Standby loan agreed to provide related to ARO											$ 400,000,000
Fixed operating lease expenses							149,000,000	$ 222,000,000
Short-term lease expense							80,000,000	18,000,000
Financing costs, net							267,000,000	462,000,000	$ 478,000,000
Variable lease payment							41,000,000	78,000,000
Assets Held Under Finance Leases
Commitment And Contingencies [Line Items]
Depreciation							2,000,000	7,000,000
Financing costs, net							2,000,000	$ 3,000,000
Apollo Exploration Lawsuit
Commitment And Contingencies [Line Items]
Loss contingency damages sought value					$ 200,000,000
Canadian Operations Divestiture Dispute
Commitment And Contingencies [Line Items]
Loss contingency punitive damages		$ 60,000,000
California Litigation
Commitment And Contingencies [Line Items]
Number of actions filed | Action			2	3
Number of defendants | defendant				30
Delaware Litigation
Commitment And Contingencies [Line Items]
Number of defendants | defendant	25
Castex Lawsuit
Commitment And Contingencies [Line Items]
Loss contingency damages sought value							200,000,000
Loss contingency estimate of possible loss							60,000,000
Oklahoma Class Actions
Commitment And Contingencies [Line Items]
Loss contingency damages sought value							$ 250,000,000
Number of actions filed | Action							2
Apache Australia Operation | Australian Operations Divestiture Dispute
Commitment And Contingencies [Line Items]
Gain contingency, unrecorded amount													$ 80
Loss contingency estimate of possible loss												$ 200
Gulf Of Mexico Shelf Operations And Properties | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Commitment And Contingencies [Line Items]
Proceeds from sale of operations and properties										$ 3,750,000,000
Discounted asset abandonment liabilities assumed										$ 1,500,000,000
Percentage of net profits interest for funding trust account										10.00%
Minimum | Apollo Exploration Lawsuit
Commitment And Contingencies [Line Items]
Loss contingency damages sought value						$ 1,100,000,000