XML 102 R78.htm IDEA: XBRL DOCUMENT
v3.10.0.1

RETIREMENT AND POSTRETIREMENT BENEFIT PLANS - ASSUMPTIONS (Details) - USD ($) $ in Millions | 4 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Aug. 31, 2018 | Aug. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Pension Benefits |  |  |  |  |  |
Benefit Obligation Assumptions: |  |  |  |  |  |
Discount rate | 4.09% | 3.45% |  |  | 4.09% | 3.45%
Net Periodic Benefit Cost Assumptions: |  |  |  |  |  |
Discount rate | 3.45% | 3.90% | 3.45% | 3.90% |  |
Assumed long-term rate of return on assets |  |  |  |  | 6.50% | 6.50%
Net decrease in pension plan obligations |  |  |  |  | $ 1 |
Postretirement Benefits |  |  |  |  |  |
Benefit Obligation Assumptions: |  |  |  |  |  |
Discount rate | 4.29% | 3.61% |  |  | 4.29% | 3.61%
Net Periodic Benefit Cost Assumptions: |  |  |  |  |  |
Discount rate | 4.14% | 4.15% | 3.61% | 4.15% |  |
Assumed long-term rate of return on assets |  |  |  |  | 0.00% | 0.00%
Net decrease in postretirement plan obligations |  |  |  |  | $ 1 |
Assumed healthcare cost trend rates |  |  |  |  |  |
Consumer Price Index (CPI) increase (as a percent) |  |  |  |  |  | 1.97%
Projected annual rates of healthcare cost trend rates (as a percent) | 8.00% |  |  |  | 8.00% |
Projected ultimate healthcare cost trend rates (as a percent) | 4.50% |  |  |  | 4.50% |
Projected annual rates of healthcare cost trend rates, thereafter (as a percent) | 4.50% |  |  |  | 4.50% |
Effect of 1-percent increase or a 1-percent decrease in these assumed healthcare cost trend rates |  |  |  |  |  |
Effect of 1-percent increase in assumed healthcare cost trend rates on postretirement benefit obligation |  |  |  |  | $ 102 |
Effect of 1-percent decrease in assumed healthcare cost trend rates on postretirement benefit obligation |  |  |  |  | 82 |
Effect of 1-percent increase in assumed healthcare cost trend rate on annual service and interest costs |  |  |  |  | 10 |
Effect of 1-percent decrease in assumed healthcare cost trend rate on annual service and interest costs |  |  |  |  | $ 8 |
Postretirement Benefits | MAPD |  |  |  |  |  |
Assumed healthcare cost trend rates |  |  |  |  |  |
Projected annual rates of healthcare cost trend rates, year nine and beyond (as a percent) | 4.50% |  |  |  | 4.50% |
Postretirement Benefits | MAPD | Low end of range |  |  |  |  |  |
Assumed healthcare cost trend rates |  |  |  |  |  |
Projected annual rates of healthcare cost trend rates (as a percent) | 22.00% |  |  |  | 22.00% |
Projected annual rates of healthcare cost trend rates, year two (as a percent) | 6.00% |  |  |  | 6.00% |
Postretirement Benefits | MAPD | High end of range |  |  |  |  |  |
Assumed healthcare cost trend rates |  |  |  |  |  |
Projected annual rates of healthcare cost trend rates (as a percent) | 34.00% |  |  |  | 34.00% |
Projected annual rates of healthcare cost trend rates, year two (as a percent) | 10.00% |  |  |  | 10.00% |
Postretirement Benefits | Non-MAPD |  |  |  |  |  |
Assumed healthcare cost trend rates |  |  |  |  |  |
Projected ultimate healthcare cost trend rates (as a percent) | 7.75% |  |  |  | 7.75% |
Projected annual rates of healthcare cost trend rates, year seven and beyond (as a percent) | 4.50% |  |  |  | 4.50% |
Foreign Pension Plans | Low end of range |  |  |  |  |  |
Net Periodic Benefit Cost Assumptions: |  |  |  |  |  |
Discount rate |  |  |  |  | 1.00% |
Average rate of increase in compensation levels (as a percent) |  |  |  |  | 1.00% |
Foreign Pension Plans | High end of range |  |  |  |  |  |
Net Periodic Benefit Cost Assumptions: |  |  |  |  |  |
Discount rate |  |  |  |  | 8.90% | 10.80%
Average rate of increase in compensation levels (as a percent) |  |  |  |  | 8.00% |

X
- Definition Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Thereafter + References No definition available. + Details
Name: | oxy_DefinedBenefitPlanHealthCareCostTrendRateAssumedThereafter
Namespace Prefix: | oxy_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Year Nine And Thereafter + References No definition available. + Details
Name: | oxy_DefinedBenefitPlanHealthCareCostTrendRateAssumedYearNineAndThereafter
Namespace Prefix: | oxy_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Year Seven And Thereafter + References No definition available. + Details
Name: | oxy_DefinedBenefitPlanHealthCareCostTrendRateAssumedYearSevenAndThereafter
Namespace Prefix: | oxy_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition This element represents the assumed Consumer Price Index (CPI) increase used for projecting health care cost trend rates. + References No definition available. + Details
Name: | oxy_DefinedBenefitPlanHealthCareCostTrendRateConsumerPriceIndexIncrease
Namespace Prefix: | oxy_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Benefit Plan, Ultimate Health Care Cost Trend Rate, Year Two + References No definition available. + Details
Name: | oxy_DefinedBenefitPlanUltimateHealthCareCostTrendRateYearTwo
Namespace Prefix: | oxy_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Amount of decrease in accumulated postretirement benefit obligation from one-percentage-point decrease in assumed health care cost trend rate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of decrease in service and interest cost components of net periodic postretirement benefit cost from one-percentage-point decrease in assumed health care cost trend rate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of increase in accumulated postretirement benefit obligation from one-percentage-point increase in assumed health care cost trend rate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of increase in service and interest cost components of net periodic postretirement benefit cost from one-percentage-point increase in assumed health care cost trend rate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Ultimate trend rate for health care cost for defined benefit postretirement plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanUltimateHealthCareCostTrendRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

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

X
- Definition Amount of increase (decrease) in obligation for pension benefits. Includes, but is not limited to, defined benefit or defined contribution plans. Excludes other postretirement benefits. + 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 (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
Name: | us-gaap_IncreaseDecreaseInPensionPlanObligations
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of increase (decrease) in obligation for other postretirement benefits. Includes, but is not limited to, defined benefit and defined contribution plans. Excludes pension benefits. + 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 (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
Name: | us-gaap_IncreaseDecreaseInPostretirementObligations
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanNameAxis=oxy_MedicareAdvantagePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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_RetirementPlanNameAxis=oxy_NonMedicareAdvantagePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_ForeignPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |