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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
PROPERTY, PLANT AND EQUIPMENT |  |  |
Maximum time period after which costs of exploratory wells are charged to expense if determination of proved reserves has not been made | 12 months |  |
Capitalized exploratory well costs for continuing operations |  |  |
Balance - Beginning of Year | $ 76 | $ 141 | $ 140
Additions to capitalized exploratory well costs pending the determination of proved reserves | 29 | 88 | 462
Reclassifications to property, plant and equipment based on the determination of proved reserves | (28) | (78) | (423)
Spin-off of California Resources |  |  | (17)
Capitalized exploratory well costs charged to expense | (21) | (75) | (21)
Balance - End of Year | 56 | 76 | $ 141
Net capitalized costs attributable to unproved properties | $ 1,400 | $ 300 |
Chemical | Low end of range |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
The estimated useful lives of Occidental's chemical assets | 3 years |  |
Chemical | High end of range |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
The estimated useful lives of Occidental's chemical assets | 50 years |  |

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- Definition This element describes the maximum time period after which costs of exploratory wells are charged to expense if a determination of proved reserves has not been made. + References No definition available. + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Properties -URI http://asc.fasb.org/extlink&oid=21914647 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -Glossary Unproved Properties -URI http://asc.fasb.org/extlink&oid=6527831 + Details
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- Definition Additions to capitalized exploratory well costs that were added during the reporting period pending the determination of proved reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6806780-109447 + Details
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- Definition Amount of expense for capitalized exploratory well costs for which proved reserves were not found at the exploratory well. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6806780-109447 + Details
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- Definition Previously capitalized costs of the drilling of wells that were reclassified as part of the costs of the enterprise's wells and related equipment and facilities at the time that proved reserves were found. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6806780-109447 + Details
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