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

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

No definition available.

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