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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) (Minimum)	9 Months Ended
	Sep. 30, 2012
Minimum
Maturity of Canadian government securities	90 days

X

- Definition

Maturity Period Used to Classify Investments

+ References

No definition available.

+ Details

Name:	mur_MaturityPeriodUsedToClassifyInvestments
Namespace Prefix:	mur_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration