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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS - DEFINED CONTRIBUTION PLANS (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
DEFINED CONTRIBUTION PLANS |  |  |
Accrued liabilities for the supplemental retirement plan | $ 175 | $ 163 |
Expenses under provisions of defined contribution and supplemental retirement plans | $ 130 | $ 113 | $ 136

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- Definition This element represents the accrued liabilities for supplemental retirement benefit plan which provides restoration of benefit lost due to government limitations on qualified retirement benefits. + References No definition available. + Details
Name: | oxy_SupplementalRetirementPlanSupplementalRetirementPlanAccruedLiabilities
Namespace Prefix: | oxy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_DefinedContributionPensionAndOtherPostretirementPlansDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration