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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - NATURE OF OPERATIONS, WES INVESTMENT AND DISCONTINUED OPERATIONS (Details) shares in Millions, $ in Millions		1 Months Ended	3 Months Ended			5 Months Ended	12 Months Ended
	Aug. 08, 2019	Aug. 31, 2020 USD ($) shares	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) segment	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jan. 31, 2020 USD ($)	Sep. 30, 2019 USD ($)
NATURE OF OPERATIONS
Number of reportable segments | segment							3
Summary of significant accounting policies
Equity method investment amounts						$ 6,389	$ 3,250	$ 6,389	$ 1,680
Loss from equity investment							(370)	(373)	$ (331)
Impairments of assets				$ 8,600				$ 285
Anadarko Petroleum Corporation
Summary of significant accounting policies
Revenues from date of the acquisition						4,200
Equity method investment amounts							2,900
WES | Anadarko Petroleum Corporation
Summary of significant accounting policies
Revenues from date of the acquisition						1,100
Expenses from date of the acquisition						500
Operating cash flows from date of the acquisition						498
Algeria Africa Assets
Summary of significant accounting policies
Impairments of assets				931
Ghana Assets
Summary of significant accounting policies
Impairments of assets							2,200
Disposed of by sale | Mozambique LNG Assets
Summary of significant accounting policies
Sale consideration											$ 4,200
Disposed of by sale | South Africa Assets
Summary of significant accounting policies
Sale consideration										$ 100
Disposed of by sale | Ghana Assets
Summary of significant accounting policies
Impairments of assets				$ 1,400
WES
Summary of significant accounting policies
Loss on non-cash transaction		$ 46
Common units exchanged to retire note payable (in units) | shares		27.9
Note payable retired		$ 260
WES
Summary of significant accounting policies
Percentage of unaffiliated unitholders								20.00%
WES | Occidental
Summary of significant accounting policies
Voting percentage for certain unitholder matters, limit								45.00%
Limited partner units percentage								40.00%
Transfer of limited partner interest, percentage								2.00%
Economic interest to general partner, percentage								2.00%
WES
Summary of significant accounting policies
Pro-rata interest in net assets							$ 437
Non-voting general partner interest							2.00%
Limited partner interest							51.80%
Effective economic interest							53.50%
Ownership interest, intended reduction							50.00%
WES | Public Ownership | WES
Summary of significant accounting policies
Limited partner interest							44.60%	44.60%
WES Operating | WES
Summary of significant accounting policies
Limited partner interest	98.00%
WES
Summary of significant accounting policies
Equity method investment amounts						$ 5,100	$ 1,930	$ 5,100
Impairment of equity method investment			$ 2,700					$ 1,000
Loss from equity investment					$ 236

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