Investments in Equity-Accounted Associates and Joint Ventures - Summary of Aggregate Financial Information Related to Proportionate Interest in Equity-Accounted Associates (Detail) - CAD ($) $ in Millions	12 Months Ended
	Oct. 31, 2022	Oct. 31, 2021
Disclosure of associates [line items]
Net income (loss)	$ 47	$ 55
Associates [member]
Disclosure of associates [line items]
Net income (loss)	(5)	4
OCI		1
Total comprehensive income (loss)	$ (5)	$ 5