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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - PROPERTY, PLANT AND EQUIPMENT AND GOODWILL (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Capitalized exploratory well costs for continuing operations |  |  |
Balance — beginning of year | $ 112 | $ 108 | $ 56
Exploratory well costs acquired through the Acquisition | 231 | 0 | 0
Additions to capitalized exploratory well costs pending the determination of proved reserves | 383 | 220 | 201
Reclassifications to property, plant and equipment based on the determination of proved reserves | (230) | (198) | (128)
Capitalized exploratory well costs charged to expense | (72) | (18) | (21)
Balance — end of year | 424 | 112 | $ 108
Net capitalized costs attributable to unproved properties | 29,500 | $ 1,000 |
Goodwill derecognized | 4,600 |  |
Anadarko Petroleum Corporation |  |  |
Capitalized exploratory well costs for continuing operations |  |  |
Goodwill recognized associated with the Acquisition | $ 5,800 |  |
Chemical | Low end of range |  |  |
Capitalized exploratory well costs for continuing operations |  |  |
The estimated useful lives of Occidental's chemical assets | 3 years |  |
Chemical | High end of range |  |  |
Capitalized exploratory well costs for continuing operations |  |  |
The estimated useful lives of Occidental's chemical assets | 50 years |  |
Marketing and Midstream |  |  |
Capitalized exploratory well costs for continuing operations |  |  |
Goodwill | $ 1,200 |  |

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- Definition Capitalized costs of unproven properties that include fee ownership or a lease, concession, or other interest representing the right to extract oil or gas subject to such terms as may be imposed by the conveyance of that interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61926-109447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -URI http://asc.fasb.org/topic&trid=2145477 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61901-109447 + Details
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