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v3.19.3

Leases (Narrative) (Details) | 9 Months Ended
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Sep. 30, 2019
Minimum |
Remaining lease terms | 1 year
Period in which leases have termination option | 1 month
Maximum |
Remaining lease terms | 17 years

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- Definition Operating And Finance Lease Terms, Period In Which Leases Have Termination Option + References No definition available. + Details
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Namespace Prefix: | mur_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Operating And Finance Leases, Remaining Term + References No definition available. + Details
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Namespace Prefix: | mur_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

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