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Earnings per Share (Anti Dilutive Securities Not Included in Computation of Diluted EPS) (Details) - $ / shares | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Earnings per Share [Abstract] |  |
Antidilutive stock options excluded from diluted shares (in shares) | 3,798,792 | 5,029,752
Weighted average price of these options (per share) | $ 50.77 | $ 52.26

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- Definition Antidilutive Securities Excluded From Computation Of Earnings Per Share Weighted Average Price + References No definition available. + Details
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Namespace Prefix: | mur_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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