v3.22.4
Post-Employment Benefits - Summary of Net Remeasurement Gains (Losses) Recognized in OCI (Detail) - CAD ($)
$ in Millions
3 Months Ended
Jan. 31, 2023
Oct. 31, 2022
Jan. 31, 2022
Pension plan [member]      
Disclosure of defined benefit plans [line items]      
Net actuarial gains (losses) on defined benefit obligation $ (448) $ 443 $ 279
Net actuarial gains (losses) on plan assets 342 (723) (150)
Changes in asset ceiling excluding interest income (1) 2  
Net remeasurement gains (losses) recognized in OCI (107) (278) 129
Other post employment benefit plans [member]      
Disclosure of defined benefit plans [line items]      
Net actuarial gains (losses) on defined benefit obligation (23) 36 15
Net remeasurement gains (losses) recognized in OCI $ (23) $ 36 $ 15