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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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