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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - IMPAIRMENTS AND OTHER CHARGES (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Summary of significant accounting policies |  |  |  |  |
Impairments of assets | $ 8,600 |  |  | $ 285 |
Ghana Assets |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |
Impairments of assets |  |  | $ 2,200 |  |
Qatar ISSD |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |
Impairments of assets |  |  |  | $ 39 |
Qatar ISND and ISSD |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |
Impairments of assets |  |  |  |  | $ 416
Oil and gas |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |
Impairments of assets | $ 6,400 | $ 581 |  |  |
Oil and gas | Proved and unproved non-core Permian |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |
Impairments of assets |  |  | $ 7,000 |  |
Midstream and marketing |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |
Impairments of assets |  |  |  |  | $ 100

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
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