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Revenue from Contracts with Customers (Current Long-Term Contracts Outstanding) (Details) Boe in Thousands | Sep. 30, 2020 Boe MMcf
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Q4 2021 | United States |
Disaggregation of Revenue [Line Items] |
Remaining performance obligation, oil quantity per day | Boe | 17
Q4 2021 | Canada | Contracts to sell natural gas at USD Index pricing |
Disaggregation of Revenue [Line Items] |
Remaining performance obligation | 10
Q4 2020 | Canada | Contracts to sell natural gas at Alberta AECO fixed prices |
Disaggregation of Revenue [Line Items] |
Remaining performance obligation | 59
Q4 2020 | Canada | Contracts to sell natural gas at USD Index pricing |
Disaggregation of Revenue [Line Items] |
Remaining performance obligation | 60
Q4 2022 | Canada | Contracts to sell natural gas at USD Index pricing |
Disaggregation of Revenue [Line Items] |
Remaining performance obligation | 35
Q4 2022 | Canada | Contracts to sell natural gas at Malin USD fixed prices |
Disaggregation of Revenue [Line Items] |
Remaining performance obligation | 20
Q4 2024 | Canada | Contracts to sell natural gas at USD Index pricing |
Disaggregation of Revenue [Line Items] |
Remaining performance obligation | 30
Q4 2026 | Canada | Contracts to sell natural gas at USD Index pricing |
Disaggregation of Revenue [Line Items] |
Remaining performance obligation | 49

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- Definition Revenue, Remaining Performance Obligation, Oil Quantity Per Day + References No definition available. + Details
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Namespace Prefix: | mur_
Data Type: | num:energyItemType
Balance Type: | na
Period Type: | instant

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- Definition Revenue, Remaining Performance Obligation, Quantity Per Day + References No definition available. + Details
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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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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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- Details
Name: | us-gaap_ContractWithCustomerBasisOfPricingAxis=mur_AlbertaAecoFixedPriceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
Name: | us-gaap_ContractWithCustomerBasisOfPricingAxis=mur_MalinUSDFixedPricesMember
Namespace Prefix: |
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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
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Balance Type: |
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