XML 127 R99.htm IDEA: XBRL DOCUMENT v3.21.1

Financial Instruments - Commodity Price Risk Management (Details) - Hedging Instruments Transactions - Commodity price risk	12 Months Ended
	Dec. 31, 2020 $ / MMBTU $ / GJ MMBTU / d GJ / d
Fixed Price Swap, AECO Index
Disclosure of detailed information about hedging instruments [line items]
Average price of hedging instrument | $ / GJ	2.03
Fixed Price Swap, AECO Index | Weighted average
Disclosure of detailed information about hedging instruments [line items]
Weighted average volume of hedging instrument | GJ / d	37,337
Fixed Price Swap, DAWN Index
Disclosure of detailed information about hedging instruments [line items]
Average price of hedging instrument | $ / MMBTU	2.46
Fixed Price Swap, DAWN Index | Weighted average
Disclosure of detailed information about hedging instruments [line items]
Weighted average volume of hedging instrument | MMBTU / d	31,178
Fixed Price Swap, NYMEX Index
Disclosure of detailed information about hedging instruments [line items]
Average price of hedging instrument | $ / MMBTU	2.54
Fixed Price Swap, NYMEX Index | Weighted average
Disclosure of detailed information about hedging instruments [line items]
Weighted average volume of hedging instrument | MMBTU / d	20,808
Fixed Price Swap, SUMAS Index
Disclosure of detailed information about hedging instruments [line items]
Average price of hedging instrument | $ / MMBTU	2.70
Fixed Price Swap, SUMAS Index | Weighted average
Disclosure of detailed information about hedging instruments [line items]
Weighted average volume of hedging instrument | MMBTU / d	17,466
Differential Swap, AECO-STN 2 Index
Disclosure of detailed information about hedging instruments [line items]
Average price of hedging instrument | $ / GJ	0.29
Differential Swap, AECO-STN 2 Index | Weighted average
Disclosure of detailed information about hedging instruments [line items]
Weighted average volume of hedging instrument | GJ / d	20,000
Basis Swap, AECO Index, Maturing December 2023
Disclosure of detailed information about hedging instruments [line items]
Average price of hedging instrument | $ / MMBTU	1.23
Basis Swap, AECO Index, Maturing December 2023 | Weighted average
Disclosure of detailed information about hedging instruments [line items]
Weighted average volume of hedging instrument | MMBTU / d	53,333
Basis Swap, AECO Index, Maturing December 2025
Disclosure of detailed information about hedging instruments [line items]
Average price of hedging instrument | $ / MMBTU	0.97
Basis Swap, AECO Index, Maturing December 2025 | Weighted average
Disclosure of detailed information about hedging instruments [line items]
Weighted average volume of hedging instrument | MMBTU / d	20,000
Basis Swap, DAWN Index
Disclosure of detailed information about hedging instruments [line items]
Average price of hedging instrument | $ / MMBTU	0.09
Basis Swap, DAWN Index | Weighted average
Disclosure of detailed information about hedging instruments [line items]
Weighted average volume of hedging instrument | MMBTU / d	20,000

X

- Definition

Average Volume Of Hedging Instrument

+ References

No definition available.

+ Details

Name:	cnq_AverageVolumeOfHedgingInstrument
Namespace Prefix:	cnq_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The average price of a hedging instrument. [Refer: Hedging instruments [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 23B
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_23B_b&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_AveragePriceOfHedgingInstrument
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=cnq_HedgingInstrumentsTransactionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_HedgingInstrumentsAxis=cnq_FixedPriceSwapAECOIndexMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfRisksAxis=ifrs-full_CommodityPriceRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_WeightedAverageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_HedgingInstrumentsAxis=cnq_FixedPriceSwapDAWNIndexMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_HedgingInstrumentsAxis=cnq_FixedPriceSwapNYMEXIndexMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_HedgingInstrumentsAxis=cnq_FixedPriceSwapSUMASIndexMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_HedgingInstrumentsAxis=cnq_DifferentialSwapAECOSTN2IndexMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_HedgingInstrumentsAxis=cnq_BasisSwapAECOIndexMaturingDecemberTwoThousandTwentyThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_HedgingInstrumentsAxis=cnq_BasisSwapAECOIndexMaturingDecemberTwoThousandTwentyFiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_HedgingInstrumentsAxis=cnq_BasisSwapDAWNIndexMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: