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Investments in Associates - Summary of Significant Investments in Associates (Parenthetical) (Detail) - CAD ($)
$ in Millions
3 Months Ended 9 Months Ended
Apr. 30, 2022
Oct. 31, 2021
Jul. 31, 2022
Jul. 31, 2021
Disclosure of associates [line items]        
Undistributed retained earnings $ 62 $ 60 $ 63 $ 59
Canadian tires financial services business [member]        
Disclosure of associates [line items]        
Option to sell maximum additional equity interest within the next 10 years     29.00%  
Period of option to sell back equity interest after ten years     6 months  
Ownership percentage     20.00%  
Bank of Xian Co Ltd [member]        
Disclosure of associates [line items]        
Investments in associates based on quoted Stock Exchange price on Shanghai $ 579 $ 671 $ 542  
Ownership percentage 18.11% 17.99% 18.11%