v3.26.1
Insurance - Summary of the Insurance Liability by Remaining Coverage and Incurred Claims (Details) - CAD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jul. 31, 2026
Jul. 31, 2025
Jul. 31, 2026
Jul. 31, 2025
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]        
Insurance contract liabilities, beginning of period $ 19,553 $ 17,816 $ 18,866 $ 17,248
Insurance service results (69) (67) (190) (281)
Net finance expense from insurance contracts 54 138 (53) 420
Total cash flows 160 244 1,078 747
Other changes in the net carrying amount of the insurance contract 0 (797) (3) (800)
Insurance contract liabilities, end of period 19,698 17,334 19,698 17,334
Liabilities for incurred claims 103 105 103 105
The Union Life        
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]        
Insurance contracts sold   (798)   (798)
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 19,388 17,629 18,667 17,047
Insurance service results (325) (632) (1,626) (1,818)
Net finance expense from insurance contracts 54 138 (53) 420
Total cash flows 413 807 2,534 2,293
Other changes in the net carrying amount of the insurance contract 5 (785) 13 (785)
Insurance contract liabilities, end of period 19,535 17,157 19,535 17,157
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 165 187 199 201
Insurance service results 256 565 1,436 1,537
Net finance expense from insurance contracts 0 0 0 0
Total cash flows (253) (563) (1,456) (1,546)
Other changes in the net carrying amount of the insurance contract (5) (12) (16) (15)
Insurance contract liabilities, end of period $ 163 $ 177 $ 163 $ 177