XML 152 R113.htm IDEA: XBRL DOCUMENT
v3.20.1

Segmented Information - Capital Expenditures (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Exploration and evaluation assets |  |  |
Net expenditures | $ 164 | $ 282 |
Non-cash and fair value changes | (221) | (277) |
Capitalized costs | (57) | 5 |
Property, plant and equipment |  |  |
Net expenditures | 6,661 | 4,175 |
Non-cash and fair value changes | (64) | (1,211) |
Capitalized costs | 6,597 | 2,964 |
Head office |  |  |
Property, plant and equipment |  |  |
Net expenditures | 34 | 21 |
Non-cash and fair value changes | (3) | 0 |
Capitalized costs | 31 | 21 |
North America |  |  |
Property, plant and equipment |  |  |
Gain on sale of exploration and evaluation assets |  | 16 | $ 35
Construction in progress |  | 1,424 |
North America | Operating segments |  |  |
Exploration and evaluation assets |  |  |
Net expenditures | 129 | 118 |
Non-cash and fair value changes | (219) | (52) |
Capitalized costs | (90) | 66 |
Property, plant and equipment |  |  |
Net expenditures | 4,702 | 2,553 |
Non-cash and fair value changes | 918 | (362) |
Capitalized costs | 5,620 | 2,191 |
North Sea | Operating segments |  |  |
Exploration and evaluation assets |  |  |
Net expenditures | 0 | 0 |
Non-cash and fair value changes | 0 | 0 |
Capitalized costs | 0 | 0 |
Property, plant and equipment |  |  |
Net expenditures | 196 | 131 |
Non-cash and fair value changes | 153 | (597) |
Capitalized costs | 349 | (466) |
Offshore Africa | Operating segments |  |  |
Exploration and evaluation assets |  |  |
Net expenditures | 35 | (54) |
Non-cash and fair value changes | (2) | 0 |
Capitalized costs | 33 | (54) |
Property, plant and equipment |  |  |
Net expenditures | 194 | 228 |
Non-cash and fair value changes | (1,476) | (86) |
Capitalized costs | (1,282) | 142 |
Oil Sands Mining and Upgrading |  |  |
Property, plant and equipment |  |  |
Construction in progress | 115 |  |
Oil Sands Mining and Upgrading | Operating segments |  |  |
Exploration and evaluation assets |  |  |
Net expenditures | 0 | 218 |
Non-cash and fair value changes | 0 | (225) |
Capitalized costs | 0 | (7) |
Property, plant and equipment |  |  |
Net expenditures | 1,525 | 1,229 |
Non-cash and fair value changes | 344 | (166) |
Capitalized costs | 1,869 | 1,063 |
Exploration and Production | Operating segments |  |  |
Property, plant and equipment |  |  |
Net expenditures | 5,092 | 2,912 |
Non-cash and fair value changes | (405) | (1,045) |
Capitalized costs | 4,687 | 1,867 |
Midstream and Refining | Operating segments |  |  |
Property, plant and equipment |  |  |
Net expenditures | 10 | 13 |
Non-cash and fair value changes | 0 | 0 |
Capitalized costs | 10 | 13 |
Devon | North America | Operating segments |  |  |
Exploration and evaluation assets |  |  |
Net expenditures | 3,126 |  |
Exploration and evaluation assets | Oil Sands Mining and Upgrading | Operating segments |  |  |
Exploration and evaluation assets |  |  |
Net expenditures |  | 222 |
Exploration and evaluation assets | Devon | North America | Operating segments |  |  |
Exploration and evaluation assets |  |  |
Net expenditures | 91 |  |
Contingent liability for decommissioning, restoration and rehabilitation costs | Oil Sands Mining and Upgrading | Operating segments |  |  |
Exploration and evaluation assets |  |  |
Net expenditures |  | $ 4 |
GABON | Offshore Africa | Operating segments |  |  |
Property, plant and equipment |  |  |
Disposals, property, plant and equipment | $ (1,515) |  |

X
- Definition Capitalised Costs, Exploration For And Evaluation Of Mineral Resources + References No definition available. + Details
Name: | cnq_CapitalisedCostsExplorationForAndEvaluationOfMineralResources
Namespace Prefix: | cnq_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Capitalised Costs, Property, Plant And Equipment + References No definition available. + Details
Name: | cnq_CapitalisedCostsPropertyPlantAndEquipment
Namespace Prefix: | cnq_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Exploration For And Evaluation Of Mineral Resources [Abstract] + References No definition available. + Details
Name: | cnq_ExplorationForAndEvaluationOfMineralResourcesAbstract
Namespace Prefix: | cnq_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Gains (Losses) On Disposals Of Exploration And Evaluation Assets + References No definition available. + Details
Name: | cnq_GainsLossesOnDisposalsOfExplorationAndEvaluationAssets
Namespace Prefix: | cnq_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Net Expenditures (Proceeds), Exploration For And Evaluation Of Mineral Resources + References No definition available. + Details
Name: | cnq_NetExpendituresProceedsExplorationForAndEvaluationOfMineralResources
Namespace Prefix: | cnq_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Net Expenditures (Proceeds), Property, Plant and Equipment + References No definition available. + Details
Name: | cnq_NetExpendituresProceedsPropertyPlantandEquipment
Namespace Prefix: | cnq_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Non-Cash And Fair Value Changes, Exploration For And Evaluation Of Mineral Resources + References No definition available. + Details
Name: | cnq_NonCashAndFairValueChangesExplorationForAndEvaluationOfMineralResources
Namespace Prefix: | cnq_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Non-Cash And Fair Value Changes, Property, Plant And Equipment + References No definition available. + Details
Name: | cnq_NonCashAndFairValueChangesPropertyPlantAndEquipment
Namespace Prefix: | cnq_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of expenditure capitalised during the construction of non-current assets that are not yet available for use. [Refer: Non-current assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2019-01-01 -Paragraph 37 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_37&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_ConstructionInProgress
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The decrease in property, plant and equipment resulting from disposals. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2019-01-01 -Paragraph 73 -Subparagraph e -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_e_ii&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_DisposalsPropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | ifrs-full_PropertyPlantAndEquipmentAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_SegmentConsolidationItemsAxis=ifrs-full_UnallocatedAmountsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=cnq_NorthAmericaExplorationAndProductionSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentConsolidationItemsAxis=ifrs-full_OperatingSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=cnq_NorthSeaExplorationAndProductionSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=cnq_OffshoreAfricaExplorationAndProductionSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=cnq_OilSandsMiningAndUpgradingSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=cnq_ExplorationAndProductionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=cnq_MidstreamAndRefiningSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BusinessCombinationsAxis=cnq_DevonCanadaCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_ExplorationAndEvaluationAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfContingentLiabilitiesAxis=ifrs-full_ContingentLiabilityForDecommissioningRestorationAndRehabilitationCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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