XML 171 R128.htm IDEA: XBRL DOCUMENT v3.25.3
Insurance - Summary of the Insurance Liability by Remaining Coverage and Incurred Claims (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Insurance contract liabilities, beginning of year $ 17,248 $ 13,349
Insurance service results (358) (347)
Net finance expenses from insurance contracts 1,048 2,206
Total cash flows 1,724 2,040
Other changes in the net carrying amount of the insurance contract (796)  
Insurance contract liabilities, end of year 18,866 17,248
Liabilities for remaining coverage [member]    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Insurance contract liabilities, beginning of year 17,047 13,114
Insurance service results (2,406) (1,448)
Net finance expenses from insurance contracts 1,048 2,206
Total cash flows 3,763 3,176
Other changes in the net carrying amount of the insurance contract (785) (1)
Insurance contract liabilities, end of year 18,667 17,047
Liabilities for incurred claims [member]    
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]    
Insurance contract liabilities, beginning of year 201 235
Insurance service results 2,048 1,101
Total cash flows (2,039) (1,136)
Other changes in the net carrying amount of the insurance contract (11) 1
Insurance contract liabilities, end of year $ 199 $ 201