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Environmental and Other Contingencies (Details) $ in Millions	Sep. 30, 2025 USD ($)
Environmental Remediation Obligations [Abstract]
Threshold for disclosure of monetary sanctions related to aware of legal environmental proceedings	$ 1.0

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- Definition

Threshold For Disclosure Of Monetary Sanctions, Not Aware Of Environmental Legal Proceedings

+ References

No definition available.

+ Details

Name:	mur_ThresholdForDisclosureOfMonetarySanctionsNotAwareOfEnvironmentalLegalProceedings
Namespace Prefix:	mur_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_EnvironmentalRemediationObligationsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration