Inventory (Details) $ in Millions	12 Months Ended
Dec. 31, 2020 CAD ($) emissionCredit	Dec. 31, 2019 CAD ($) emissionCredit
Disclosure of inventories [Abstract]
Inventory write-down \| $	$ 37
Additions to emission credits \| emissionCredit	1,434,761	388,155
Purchased emission credits \| $	$ 38	$ 4
Inventory, emission credits \| emissionCredit	502,653	411,115

The amount of expense recognised related to the write-down of inventories to net realisable value. [Refer: Inventories]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 2
-IssueDate 2019-01-01
-Paragraph 36
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=2&code=ifrs-tx-2019-en-r&anchor=para_36_e&doctype=Standard
-URIDate 2019-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 98
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_98_a&doctype=Standard
-URIDate 2019-03-27

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Balance Type:	na
Period Type:	duration