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Insurance (Narrative) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Disclosure Of Other Movements In Insurance Liabilities [Line Items]    
Recoveries from reinsurers $ 439 $ 1,054
Ceded premiums 611 530
Investment return on securities supporting insurance contracts 247 372
Insurance finance expense (299) (443)
Insurance contract liabilities $ 7,278 $ 7,169
Bottom of range [member]    
Disclosure Of Other Movements In Insurance Liabilities [Line Items]    
Insurance liabilities, discount rate period 1 year  
Insurance liabilities, discount rate 2.80% 3.80%
Top of range [member]    
Disclosure Of Other Movements In Insurance Liabilities [Line Items]    
Insurance liabilities, discount rate period 10 years  
Insurance liabilities, discount rate 4.10% 4.50%
Other Insurance [Member]    
Disclosure Of Other Movements In Insurance Liabilities [Line Items]    
Insurance contract liabilities $ 139 $ 144
Life And Health [Member]    
Disclosure Of Other Movements In Insurance Liabilities [Line Items]    
Insurance contract liabilities $ 113 $ 121
Automobile [Member]    
Disclosure Of Other Movements In Insurance Liabilities [Line Items]    
Percentage of net written premiums 64.30% 65.50%
Residential [member]    
Disclosure Of Other Movements In Insurance Liabilities [Line Items]    
Percentage of net written premiums 35.30% 34.30%
Ontario [Member]    
Disclosure Of Other Movements In Insurance Liabilities [Line Items]    
Percentage of net written premiums 51.40% 50.50%
Western Provinces [Member]    
Disclosure Of Other Movements In Insurance Liabilities [Line Items]    
Percentage of net written premiums 31.00% 31.90%
Atlantic Provinces [Member]    
Disclosure Of Other Movements In Insurance Liabilities [Line Items]    
Percentage of net written premiums 10.50% 10.60%
Quebec [Member]    
Disclosure Of Other Movements In Insurance Liabilities [Line Items]    
Percentage of net written premiums 6.70% 6.80%