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Revenue from Contracts with Customers (Current Long-Term Contracts Outstanding) (Details) | Dec. 31, 2018 MMcf / d Boe / d
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End Date, Q3, 2019 [Member] | United States [Member] |
Disaggregation of Revenue [Line Items] |
Approximate Net Volumes | Boe / d | 4,000
End Date, Q4, 2021 [Member] | United States [Member] |
Disaggregation of Revenue [Line Items] |
Approximate Net Volumes | Boe / d | 17,000
End Date, Q4, 2020 [Member] | Canada [Member] | Alberta AECO [Member] |
Disaggregation of Revenue [Line Items] |
Approximate Net Volumes | 59
End Date, Q4, 2020 [Member] | Canada [Member] | USD Index Pricing [Member] |
Disaggregation of Revenue [Line Items] |
Approximate Net Volumes | 60
End Date, Q4, 2024 [Member] | Canada [Member] | USD Index Pricing [Member] |
Disaggregation of Revenue [Line Items] |
Approximate Net Volumes | 30
End Date, Q4, 2026 [Member] | Canada [Member] | USD Index Pricing [Member] |
Disaggregation of Revenue [Line Items] |
Approximate Net Volumes | 38

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- Definition Revenue, Remaining Performance Obligation, Quantity + References No definition available. + Details
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Namespace Prefix: | mur_
Data Type: | xbrli:decimalItemType
Balance Type: | na
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- 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
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- Details
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- Details
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- Details
Name: | us-gaap_ContractWithCustomerDurationAxis=mur_EndDateQuarter42021Member
Namespace Prefix: |
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Period Type: |

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- Details
Name: | us-gaap_ContractWithCustomerDurationAxis=mur_EndDateQuarter42020Member
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- Details
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- Details
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Data Type: | na
Balance Type: |
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- Details
Name: | us-gaap_ContractWithCustomerBasisOfPricingAxis=mur_UsdIndexPricingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
Name: | us-gaap_ContractWithCustomerDurationAxis=mur_EndDateQuarter42024Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ContractWithCustomerDurationAxis=mur_EndDateQuarter42026Member
Namespace Prefix: |
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Balance Type: |
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