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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - NATURE OF OPERATIONS, WES INVESTMENT AND DISCONTINUED OPERATIONS (Details) $ in Millions |  | 5 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 08, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) segment | Sep. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
NATURE OF OPERATIONS |  |  |  |  |  |
Number of reportable segments | segment |  |  | 3 |  |  |
Summary of significant accounting policies |  |  |  |  |  |
Equity method investment amounts |  | $ 6,389 | $ 6,389 |  | $ 1,680 | $ 1,515
Mozambique LNG Assets | Disposed of by sale |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |
Sale consideration |  |  |  | $ 4,200 |  |
WES |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |
Equity method investment amounts |  | 5,128 | 5,128 |  |  |
Charge recorded as a result of loss of control |  |  | 1,000 |  |  |
Anadarko Petroleum Corporation |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |
Revenues from date of the Acquisition |  | 4,200 |  |  |  |
Equity method investment amounts |  | 2,800 | $ 2,800 |  |  |
Anadarko Petroleum Corporation | Africa Assets | Assets held for sale |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |
Sale consideration | $ 8,800 |  |  |  |  |
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 |  |  |  |
WES Operating |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |
Non-voting general partner unit interest |  |  | 2.00% |  |  |
WES |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |
Limited partner interest |  |  | 55.40% |  |  |
Non-voting general partner unit interest |  |  | 2.00% |  |  |
Limited partner unit interest |  |  | 54.50% |  |  |
Total effective economic interest in WES |  |  | 56.30% |  |  |
Pro rata share of net assets |  | 1,900 | $ 1,900 |  |  |
Tax basis difference |  | $ 3,200 | $ 3,200 |  |  |
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 | WES Operating |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |
Limited partner interest | 98.00% |  |  |  |  |
Public Ownership | WES | WES |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |
Limited partner interest |  |  | 44.60% |  |  |

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