XML 17 R7.htm IDEA: XBRL DOCUMENT
v3.8.0.1

CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Minimum [Member] |  |
Maturity of Canadian government securities | 90 days | 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

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |