XML 65 R55.htm IDEA: XBRL DOCUMENT
v3.21.2

Environmental Liabilities and Expenditures (Details) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2016 mi | Sep. 30, 2016 USD ($) | Jun. 30, 2021 USD ($) site | Dec. 31, 2020 USD ($)
Environmental remediation reserves |  |  |  |
Number of Sites | site |  |  | 166 |
Environmental remediation reserves, current, included in accrued liabilities |  |  | $ 1,143,000,000 |
Environmental remediation reserves, non-current, included in deferred credits and other liabilities - other |  |  | 1,020,000,000 | $ 1,028,000,000
Environmental reserves, exceeding $ ten million, threshold value |  |  | $ 10,000,000 |
Environmental reserves, exceeding $ ten million, number of sites | site |  |  | 19 |
Environmental reserves, range between zero to $ one million site category, number of sites | site |  |  | 94 |
Percent of reserve to be funded over the next three to four years |  |  | 50.00% |
Period of expending remaining environmental reserves (or more) |  |  | 10 years |
Environmental remediation additional loss range |  |  | $ 1,100,000,000 |
Low end of range |  |  |  |
Environmental remediation reserves |  |  |  |
Environmental reserves, range between zero to $ one million site category |  |  | $ 0 |
Period of expending first half of environmental reserves |  |  | 3 years |
High end of range |  |  |  |
Environmental remediation reserves |  |  |  |
Environmental reserves, range between zero to $ one million site category |  |  | $ 1,000,000 |
Period of expending first half of environmental reserves |  |  | 4 years |
NPL sites |  |  |  |
Environmental remediation reserves |  |  |  |
Number of Sites | site |  |  | 32 |
Environmental remediation reserves, current, included in accrued liabilities |  |  | $ 438,000,000 |
Third-party sites |  |  |  |
Environmental remediation reserves |  |  |  |
Number of Sites | site |  |  | 68 |
Environmental remediation reserves, current, included in accrued liabilities |  |  | $ 299,000,000 |
Occidental-operated sites |  |  |  |
Environmental remediation reserves |  |  |  |
Number of Sites | site |  |  | 17 |
Environmental remediation reserves, current, included in accrued liabilities |  |  | $ 136,000,000 |
Closed or non-operated Occidental sites |  |  |  |
Environmental remediation reserves |  |  |  |
Number of Sites | site |  |  | 49 |
Environmental remediation reserves, current, included in accrued liabilities |  |  | $ 270,000,000 |
Lower Passaic River |  |  |  |
Environmental remediation reserves |  |  |  |
Stretch of Lower Passaic river requiring remedial actions | mi | 8.3 |  |  |
Stretch of Lower Passaic river not covered by remedial actions | mi | 9 |  |  |
Clean-up estimated cost |  | $ 165,000,000 |  |
Accrued liabilities |  |  |  |
Environmental remediation reserves |  |  |  |
Environmental remediation reserves, current, included in accrued liabilities |  |  | 123,000,000 |
Deferred credits and other liabilities - other |  |  |  |
Environmental remediation reserves |  |  |  |
Environmental remediation reserves, non-current, included in deferred credits and other liabilities - other |  |  | $ 1,000,000,000.0 |

X
- Definition Represents amount expected to incur on proposed clean-up plan. + References No definition available. + Details
Name: | oxy_CleanUpPlanEstimatedCost
Namespace Prefix: | oxy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This element represents the reasonably possible additional loss that may be incurred beyond the recorded liabilities for environmental remediation. + References No definition available. + Details
Name: | oxy_EnvironmentalRemediationPossibleAdditionalLossBeyondAccruals
Namespace Prefix: | oxy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the number of remediation sites of the entity, as aggregated by type of environmental remediation site. + References No definition available. + Details
Name: | oxy_EnvironmentalRemediationSitesNumber
Namespace Prefix: | oxy_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition This item represents the number of sites with each site's reserves exceeding ten million. + References No definition available. + Details
Name: | oxy_EnvironmentalReservesExceedingTenMillionSiteCategoryNumberOfSites
Namespace Prefix: | oxy_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition This item represents the amount which a site's reserve must exceed, which is ten million. + References No definition available. + Details
Name: | oxy_EnvironmentalReservesExceedingTenMillionThresholdValueSiteCategory
Namespace Prefix: | oxy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition This item represents the number of sites with each site's reserves in between zero to one million. + References No definition available. + Details
Name: | oxy_EnvironmentalReservesRangeBetweenZeroToOneMillionSiteCategoryNumberOfSites
Namespace Prefix: | oxy_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition This item represents the reserve, in which a site's reserve must range between zero and one million. + References No definition available. + Details
Name: | oxy_EnvironmentalReservesRangeBetweenZeroToOneMillionThresholdValueSiteCategory
Namespace Prefix: | oxy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Percent of environmental reserves to be funded by the entity in the next three to four years. + References No definition available. + Details
Name: | oxy_PercentOfEnvironmentalReservesToBeFundedInThreeToFourYears
Namespace Prefix: | oxy_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of future years over which the entity anticipates expenditures amounting to about half of the current environmental reserves. + References No definition available. + Details
Name: | oxy_PeriodOfExpendingFirstHalfOfEnvironmentalReserves
Namespace Prefix: | oxy_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period of Expending Remaining Environmental Reserves + References No definition available. + Details
Name: | oxy_PeriodOfExpendingRemainingEnvironmentalReserves
Namespace Prefix: | oxy_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the stretch of river which may be covered by remedial actions. + References No definition available. + Details
Name: | oxy_RiverStretchWhichMayRequireRemedialActions
Namespace Prefix: | oxy_
Data Type: | dtr-types:lengthItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the stretch of river which require remedial actions. + References No definition available. + Details
Name: | oxy_RiverStretchWhichRequireRemedialActions
Namespace Prefix: | oxy_
Data Type: | dtr-types:lengthItemType
Balance Type: | na
Period Type: | duration

X
- Definition Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable in twelve months or in the next operating cycle if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 10 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13237-110859 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=124098289&loc=d3e6911-107765 + Details
Name: | us-gaap_AccruedEnvironmentalLossContingenciesCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable after twelve months or beyond the next operating cycle if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 10 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13237-110859 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 + Details
Name: | us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SiteContingencyLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EnvironmentalRemediationSiteAxis=oxy_NPLSitesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EnvironmentalRemediationSiteAxis=oxy_ThirdPartySitesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EnvironmentalRemediationSiteAxis=oxy_EntityOperatedSitesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EnvironmentalRemediationSiteAxis=oxy_ClosedOrNonOperatedEntitySitesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EnvironmentalRemediationSiteAxis=oxy_PassaicRiverMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_AccruedLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=oxy_DeferredCreditsAndOtherLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |