v3.26.1
Insurance - Summary of the Insurance Liability by Remaining Coverage and Incurred Claims (Details) - CAD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Apr. 30, 2026
Apr. 30, 2025
Apr. 30, 2026
Apr. 30, 2025
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]        
Insurance contract liabilities, beginning of period $ 19,634 $ 18,032 $ 18,863 $ 17,248
Insurance service results (100) (112) (118) (214)
Net finance expenses (income) from insurance contracts 1 (249) (107) 282
Total cash flows 18 153 918 503
Other changes in the net carrying amount of the insurance contract 0 (8) (3) (3)
Insurance contract liabilities, end of period 19,553 17,816 19,553 17,816
Liabilities for incurred claims 98 104 98 104
Liabilities for remaining coverage        
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]        
Insurance contract liabilities, beginning of period 19,448 17,814 18,664 17,047
Insurance service results (698) (763) (1,301) (1,186)
Net finance expenses (income) from insurance contracts 1 (249) (107) 282
Total cash flows 628 828 2,124 1,486
Other changes in the net carrying amount of the insurance contract 9 (1) 8 0
Insurance contract liabilities, end of period 19,388 17,629 19,388 17,629
Liabilities for incurred claims        
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]        
Insurance contract liabilities, beginning of period 186 218 199 201
Insurance service results 598 651 1,183 972
Net finance expenses (income) from insurance contracts 0 0 0 0
Total cash flows (610) (675) (1,206) (983)
Other changes in the net carrying amount of the insurance contract (9) (7) (11) (3)
Insurance contract liabilities, end of period $ 165 $ 187 $ 165 $ 187