v3.26.1
Equity (Summary of Classes of Share Capital - Common Shares) (Details) - CAD ($)
shares in Thousands, $ in Millions
 3 Months Ended 9 Months Ended
Jul. 31, 2026
Jul. 31, 2025
Jul. 31, 2026
Jul. 31, 2025
Disclosure of classes of share capital [line items]        
Balance at beginning of period     $ 127,827  
Balance at end of period $ 127,015 $ 125,394 $ 127,015 $ 125,394
Ordinary Shares [Member] | Issued capital [member]        
Disclosure of classes of share capital [line items]        
Balance at beginning of period (shares) 1,652,420 1,722,791 1,689,496 1,750,272
Balance at beginning of period $ 24,309 $ 25,136 $ 24,727 $ 25,373
Proceeds from shares issued on exercise of stock options, Number of shares 580 852 2,276 1,797
Proceeds from shares issued on exercise of stock options, Amount $ 52 $ 62 $ 202 $ 131
Shares issued as a result of dividend reinvestment plan, Number of shares 0 0 0 1,575
Shares issued as a result of dividend reinvestment plan $ 0 $ 0 $ 0 $ 130
Purchase of shares for cancellation and other, Number of Shares (14,489) (15,530) (53,261) (45,531)
Purchase of shares for cancellation and other, Amount $ (212) $ (227) $ (780) $ (663)
Balance at end of period (shares) 1,638,511 1,708,113 1,638,511 1,708,113
Balance at end of period $ 24,149 $ 24,971 $ 24,149 $ 24,971