XML 118 R45.htm IDEA: XBRL DOCUMENT
v3.20.1

Capital Disclosures (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2019
Corporate Information And Statement Of IFRS Compliance [Abstract] |
Disclosure of detailed information about capital |
|  | 2019 |  |  | 2018 |
Long-term debt, net (1) |  | $ | 20,843 |  |  | $ | 20,522 |
Total shareholders’ equity |  | $ | 34,991 |  |  | $ | 31,974 |
Debt to book capitalization |  | 37% |  |  | 39% |
(1) | Includes the current portion of long-term debt, net of cash and cash equivalents.

X
- Definition Corporate Information And Statement Of IFRS Compliance [Abstract] + References No definition available. + Details
Name: | cnq_CorporateInformationAndStatementOfIFRSComplianceAbstract
Namespace Prefix: | cnq_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure Of Detailed Information About Capital Explanatory [Table Text Block] + References No definition available. + Details
Name: | cnq_DisclosureOfDetailedInformationAboutCapitalExplanatoryTableTextBlock
Namespace Prefix: | cnq_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration