XML 29 R69.htm IDEA: XBRL DOCUMENT v3.20.1

Investments - Narrative (Details) shares in Millions	Dec. 31, 2019 shares
Investment in PrairieSky Royalty Ltd.
Disclosure of detailed information about financial instruments [line items]
Number of shares held as investment (in shares)	22.6
Investment in Inter Pipeline Ltd.
Disclosure of detailed information about financial instruments [line items]
Number of shares held as investment (in shares)	6.4

X

- Definition

Current Investments, Number Of Shares Held

+ References

No definition available.

+ Details

Name:	cnq_CurrentInvestmentsNumberOfSharesHeld
Namespace Prefix:	cnq_
Data Type:	xbrli:sharesItemType
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_DisclosureOfFinancialInstrumentsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	cnq_InvestmentNameAxis=cnq_PrairieSkyRoyaltyLtd.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	cnq_InvestmentNameAxis=cnq_InterPipelineLtd.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: