Equity Capital and Earnings Per share - Additional Information (Detail) - Major ordinary share transactions [Member] - CAD ($) $ / shares in Units, $ in Millions		12 Months Ended
Feb. 28, 2022	Dec. 31, 2021
Disclosure of Dividends [line items]
Stock repurchased and retired during period value	$ 97
Percentage of the companys issued and outstanding common shares	5.00%
Common shares [Member]
Disclosure of Dividends [line items]
Dividend declared but not paid		$ 0.33

The amount, per share, of dividends proposed or declared before financial statements were authorised for issue but not recognised as distribution to owners.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 137
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_137_a&doctype=Standard
-URIDate 2021-03-24

Name:	ifrs-full_DividendsProposedOrDeclaredBeforeFinancialStatementsAuthorisedForIssueButNotRecognisedAsDistributionToOwnersPerShare
Namespace Prefix:	ifrs-full_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration