XML 45 R51.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ASSET IMPAIRMENTS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Summary of significant accounting policies |  |  |
Impairments of assets | $ 285 |  |
Qatar ISSD |  |  |
Summary of significant accounting policies |  |  |
Impairments of assets | $ 39 |  |
Qatar ISND and ISSD |  |  |
Summary of significant accounting policies |  |  |
Impairments of assets |  | $ 416 |
Proved and unproved non-core Permian |  |  |
Summary of significant accounting policies |  |  |
Impairments of assets |  |  | $ 397
Marketing and Midstream |  |  |
Summary of significant accounting policies |  |  |
Impairments of assets |  | $ 100 |
Other asset impairment related charges |  |  | $ 120

X
- Definition Other Asset Impairment Related Charges + References No definition available. + Details
Name: | oxy_OtherAssetImpairmentRelatedCharges
Namespace Prefix: | oxy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition These concepts are used to disclose supplemental cash flow information. + References No definition available. + Details
Name: | oxy_SummaryOfSignificantAccountingPoliciesLineItems
Namespace Prefix: | oxy_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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=118932676&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
Name: | us-gaap_AssetImpairmentCharges
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | srt_StatementGeographicalAxis=oxy_QatarISSDMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=oxy_QatarISNDandISSDMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=oxy_ProvedAndUnprovedNonCorePermianMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=oxy_MidstreamAndMarketingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |