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Investments in Associates - Summary of Significant Investments in Associates (Parenthetical) (Detail) - CAD ($)
$ in Millions
3 Months Ended
Jan. 31, 2023
Oct. 31, 2022
Jan. 31, 2022
Disclosure of associates [line items]      
Undistributed retained earnings $ 66 $ 67 $ 62
Canadian tires financial services business [member]      
Disclosure of associates [line items]      
Option to sell maximum additional equity interest until the end of 10th anniversary 29.00%    
Period of option to sell back equity interest until the end of 10th anniversary 10 years    
Period of option to sell back equity interest after ten years 6 months    
Bank of Xian Co Ltd [member]      
Disclosure of associates [line items]      
Investments in associates based on quoted Stock Exchange price on Shanghai $ 556 $ 489  
Impairment of investments in associates $ 0