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Revenue from Contracts with Customers (Current and Long-Term Contracts Outstanding) (Details) | Mar. 31, 2018 MMcf / d Boe / d $ / Mcf
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Alberta AECO Fixed Price [Member] |
Disaggregation of Revenue [Line Items] |
Fixed price (Cdn/MCF) | $ / Mcf | 2.81
End Date, Q2, 2019 [Member] | United States [Member] |
Disaggregation of Revenue [Line Items] |
Approximate Net Volumes | 4,000
End Date, Q3, 2019 [Member] | United States [Member] |
Disaggregation of Revenue [Line Items] |
Approximate Net Volumes | 2,000
End Date, Q4, 2021, 2018 Deliveries [Member] | United States [Member] |
Disaggregation of Revenue [Line Items] |
Approximate Net Volumes | 19,000
End Date, Q4, 2021, 2019-2021 Deliveries [Member] | United States [Member] |
Disaggregation of Revenue [Line Items] |
Approximate Net Volumes | 13,000
End Date, Q4, 2020 [Member] | Canada [Member] | Alberta AECO Fixed Price [Member] |
Disaggregation of Revenue [Line Items] |
Approximate Net Volumes | MMcf / d | 59
End Date, Q4, 2020 [Member] | Canada [Member] | USD Index Pricing [Member] |
Disaggregation of Revenue [Line Items] |
Approximate Net Volumes | MMcf / d | 59

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- Definition Revenue, Remaining Performance Obligation, Quantity + References No definition available. + Details
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Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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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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- Definition The delivery price committed to in the contract. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
Name: | us-gaap_ContractWithCustomerDurationAxis=mur_EndDateQuarter32019Member
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Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ContractWithCustomerDurationAxis=mur_EndDateQuarter420212018DeliveriesMember
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Data Type: | na
Balance Type: |
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- Details
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- Details
Name: | us-gaap_ContractWithCustomerDurationAxis=mur_EndDateQuarter42020Member
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- Details
Name: | us-gaap_StatementGeographicalAxis=country_CA
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- Details
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