XML 162 R132.htm IDEA: XBRL DOCUMENT
v3.20.4

Supplemental Oil and Gas Information (Unaudited) - Capitalized Costs Relating to Oil and Gas Producing Activities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |
Unproved oil and natural gas properties | $ 805.7 | $ 1,570.7
Proved oil and natural gas properties | 18,654.6 | 17,490.4
Gross capitalized costs | 19,460.3 | 19,061.1
Accumulated depreciation, depletion and amortization |  |
Unproved oil and natural gas properties | (119.5) | (387.7)
Proved oil and natural gas properties | (11,131.5) | (8,739.9)
Net capitalized costs | 8,209.3 | 9,933.5
U.S. |  |
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |
Unproved oil and natural gas properties | 646.0 | 1,116.6
Proved oil and natural gas properties | 14,011.4 | 13,292.6
Gross capitalized costs | 14,657.4 | 14,409.2
Accumulated depreciation, depletion and amortization |  |
Unproved oil and natural gas properties | (105.0) | (136.4)
Proved oil and natural gas properties | (8,166.5) | (6,298.9)
Net capitalized costs | 6,385.9 | 7,973.9
Canada |  |
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |
Unproved oil and natural gas properties | 22.2 | 243.7
Proved oil and natural gas properties | 4,619.4 | 4,176.7
Gross capitalized costs | 4,641.6 | 4,420.4
Accumulated depreciation, depletion and amortization |  |
Unproved oil and natural gas properties | 0.0 | (225.4)
Proved oil and natural gas properties | (2,944.3) | (2,438.6)
Net capitalized costs | 1,697.3 | 1,756.4
Other |  |
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |
Unproved oil and natural gas properties | 137.5 | 210.4
Proved oil and natural gas properties | 23.8 | 21.1
Gross capitalized costs | 161.3 | 231.5
Accumulated depreciation, depletion and amortization |  |
Unproved oil and natural gas properties | (14.5) | (25.9)
Proved oil and natural gas properties | (20.7) | (2.4)
Net capitalized costs | $ 126.1 | $ 203.2

X
- Definition Capitalized Costs Accumulated Depreciation Depletion and Amortization for Relating to Oil and Gas Producing Activities Proved Properties. + References No definition available. + Details
Name: | mur_CapitalizedCostsAccumulatedDepreciationDepletionAndAmortizationForRelatingToOilAndGasProducingActivitiesProvedProperties
Namespace Prefix: | mur_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Capitalized Costs Accumulated Depreciation Depletion and Amortization for Relating to Oil and Gas Producing Activities Un proved Properties + References No definition available. + Details
Name: | mur_CapitalizedCostsAccumulatedDepreciationDepletionAndAmortizationForRelatingToOilAndGasProducingActivitiesUnProvedProperties
Namespace Prefix: | mur_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The sum of capitalized costs relating to oil and gas producing activities before accounting for accumulated depreciation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61901-109447 + Details
Name: | us-gaap_CapitalizedCostsOilAndGasProducingActivitiesGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Net amount of capitalized costs relating to oil and gas producing activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61901-109447 + Details
Name: | us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Capitalized costs of proved properties incurred for any combination mineral interests acquisitions; wells and related equipment; support equipment and facilities; and uncompleted wells and equipment and other costs not previously disclosed within this table. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -URI http://asc.fasb.org/subtopic&trid=2145654 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61901-109447 + Details
Name: | us-gaap_CapitalizedCostsProvedProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_CapitalizedCostsRelatingToOilAndGasProducingActivitiesByGeographicAreaLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Capitalized costs of unproved properties incurred for any combination mineral interests acquisitions and other costs not previously disclosed within this table. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -URI http://asc.fasb.org/topic&trid=2145477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61901-109447 + Details
Name: | us-gaap_CapitalizedCostsUnprovedProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_DepreciationAmortizationAndAccretionNetAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_CA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=mur_OtherRegionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |