Share-Based Compensation - Summary of Share Units (Performance Share Units) (Parenthetical) (Detail) - Performance Share Units [Member] - CAD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Current Liabilities [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Liabilities from share based transaction	$ 2	$ 4
Other Long Term Liabilities [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Liabilities from share based transaction	$ 2	$ 3

The amount of liabilities arising from share-based payment transactions. Share-based payment transactions are transactions in which the entity: (a) receives goods or services from the supplier of those goods or services (including an employee) in a share-based payment arrangement; or (b) incurs an obligation to settle the transaction with the supplier in a share-based payment arrangement when another group entity receives those goods or services. [Refer: Share-based payment arrangements [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2023-01-01
-Paragraph 51
-Subparagraph b
-Clause i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2023-en-r&anchor=para_51_b_i&doctype=Standard
-URIDate 2023-03-23

Name:	ifrs-full_LiabilitiesFromSharebasedPaymentTransactions2011
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant