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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ASSET IMPAIRMENTS (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Summary of significant accounting policies |  |  |  |
Crude oil supply agreements termination costs | $ 160 |  | $ 160 |
Asset impairments and related items |  | $ 521 | 825 | $ 10,239
Proved and unproved non-core Permian |  |  |  |
Summary of significant accounting policies |  |  |  |
Impairments of assets |  | 397 |  |
Libya |  |  |  |
Summary of significant accounting policies |  |  |  |
Impairments of assets |  |  | 61 |
Oil and Gas | United States |  |  |  |
Summary of significant accounting policies |  |  |  |
Impairments and related charges of exiting operations |  |  | (44) | 1,862
Impairments related to decline in commodity prices and changes in future development plans |  | 397 | 15 | 1,428
Rig termination charges |  |  |  | 192
Other asset impairment related charges |  |  | 5 | 204
Oil and Gas | Latin America |  |  |  |
Summary of significant accounting policies |  |  |  |
Impairments related to decline in commodity prices |  | 4 | 9 | 559
Oil and Gas | Middle East and North Africa |  |  |  |
Summary of significant accounting policies |  |  |  |
Impairments of exiting operations |  |  | 61 | 1,658
Impairments related to decline in commodity prices |  |  |  | 2,833
Chemical |  |  |  |
Summary of significant accounting policies |  |  |  |
Impairments of assets |  |  |  | 121
Midstream and Marketing |  |  |  |
Summary of significant accounting policies |  |  |  |
Other asset impairment related charges |  | $ 120 | 160 | 216
Impairments of assets |  |  |  | 814
Corporate |  |  |  |
Summary of significant accounting policies |  |  |  |
Severance, spin-off and allowance for doubtful accounts |  |  | 541 | 125
Corporate | California Resources Corporation |  |  |  |
Summary of significant accounting policies |  |  |  |
Other-than-temporary impairment of investment |  |  | $ 78 | $ 227

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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