XML 116 R103.htm IDEA: XBRL DOCUMENT v3.20.1

Financial Instruments - Commodity Price Risk Management (Details) - Commodity price risk - Swap contract	12 Months Ended
	Dec. 31, 2019 $ / MMBTU $ / GJ GJ / d MMBTU / d
AECO Basis Swap, Jan 2020 to Mar 2020
Disclosure of detailed information about hedging instruments [line items]
Natural gas energy per day | MMBTU / d	140,000
Average price of hedging instrument | $ / MMBTU	0.93
AECO Fixed Price Swap, Apr 2020 to Oct 2020
Disclosure of detailed information about hedging instruments [line items]
Natural gas energy per day | GJ / d	102,500
Average price of hedging instrument | $ / GJ	1.51

X

- Definition

Derivative Financial Instrument, Volume Rate, Natural Gas

+ References

No definition available.

+ Details

Name:	cnq_DerivativeFinancialInstrumentVolumeRateNaturalGas
Namespace Prefix:	cnq_
Data Type:	xbrli:decimalItemType
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 2019-01-01
-Paragraph 23B
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_23B_b&doctype=Standard
-URIDate 2019-03-27

+ 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_HedgingInstrumentsAxis=cnq_AECOBasisSwapJanuaryTwoThousandTwentyToMarchTwoThousandTwentyMember
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_ClassesOfFinancialInstrumentsAxis=ifrs-full_SwapContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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