XML 101 R12.htm IDEA: XBRL DOCUMENT
v3.20.1

Inventory | 12 Months Ended
--- | ---
Dec. 31, 2019
Inventories [Abstract] |
Inventory | Inventory
|  | 2019 |  |  | 2018 |
Product inventory |  | $ | 468 |  |  | $ | 297 |
Materials and supplies |  | 684 |  |  | 658 |
|  | $ | 1,152 |  |  | $ | 955 |
The Company recorded a write-down of its product inventory of $4 million from cost to net realizable value as at December 31, 2019 (2018 – $13 million).

X
- Definition Inventories [Abstract] + References No definition available. + Details
Name: | cnq_InventoriesAbstract
Namespace Prefix: | cnq_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure for inventories. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 2 -IssueDate 2019-01-01 -Section Disclosure -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=2&code=ifrs-tx-2019-en-r&doctype=Standard&dita_xref=IAS02_g36-39_TI -URIDate 2019-03-27 + Details
Name: | ifrs-full_DisclosureOfInventoriesExplanatory
Namespace Prefix: | ifrs-full_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration