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Investments in Associates - Summary of Significant Investments in Associates (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Bank of Xian Co Ltd [member]    
Disclosure of associates [line items]    
Country of incorporation [1] China  
Nature of business [1] Banking  
Ownership percentage [1] 18.10%  
Date of financial statements [1],[2] Sep. 30, 2025  
Carrying value [1] $ 729 $ 658
Maduro and curiels bank NV [member]    
Disclosure of associates [line items]    
Country of incorporation [3] Curacao  
Nature of business [3] Banking  
Ownership percentage [3] 48.10%  
Date of financial statements [2],[3] Sep. 30, 2025  
Carrying value [3] $ 570 $ 527
KeyCorp [Member]    
Disclosure of associates [line items]    
Country of incorporation [4] United States  
Nature of business [4] Banking  
Ownership percentage [4] 14.90%  
Date of financial statements [2],[4] Sep. 30, 2025  
Carrying value [4] $ 4,379  
[1] Based on the quoted price on the Shanghai Stock Exchange, the market value of the Bank’s Investment in Bank of Xi’an Co. Ltd. was $617 (October 31, 2024 – $570). The Bank has significant influence over the Bank of Xi’an Co. Ltd. through a combination of its ownership interest and board representation.
[2] Represents the date of the most recent financial statements.
[3] The local regulator requires financial institutions to set aside reserves for general banking risks. These reserves are not required under IFRS, and represent undistributed retained earnings related to a foreign associated corporation, which are subject to local regulatory restrictions. As of October 31, 2025, these reserves amounted to $76 (2024 – $74).
[4] On December 27, 2024, the Bank completed the acquisition of an additional 10% ownership interest, bringing the total ownership interest in KeyCorp to 14.9% (refer to Note 35 for further details). The Bank has significant influence over KeyCorp through a combination of its ownership interest and board representation. Based on the quoted price on the New York Stock Exchange, the market value of the Bank’s investment in KeyCorp was $4,018 as at Oct 31, 2025. During the year, dividends received from KeyCorp of $140 were recognized as a reduction in the carrying value of the investment in associate.