v3.26.1
Equity (Summary of Classes of Share Capital - Common Shares) (Details) - CAD ($)
shares in Thousands, $ in Millions
 3 Months Ended 6 Months Ended
Apr. 30, 2026
Apr. 30, 2025
Apr. 30, 2026
Apr. 30, 2025
Disclosure of classes of share capital [line items]        
Balance at beginning of period     $ 127,827  
Balance at end of period $ 124,318 $ 126,091 $ 124,318 $ 126,091
Ordinary Shares [Member] | Issued capital [member]        
Disclosure of classes of share capital [line items]        
Balance at beginning of period (shares) 1,671,278 1,752,200 1,689,496 1,750,272
Balance at beginning of period $ 24,551 $ 25,528 $ 24,727 $ 25,373
Proceeds from shares issued on exercise of stock options, Number of shares 488 592 1,696 945
Proceeds from shares issued on exercise of stock options, Amount $ 42 $ 44 $ 150 $ 69
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 (19,346) (30,001) (38,772) (30,001)
Purchase of shares for cancellation and other, Amount $ (284) $ (436) $ (568) $ (436)
Balance at end of period (shares) 1,652,420 1,722,791 1,652,420 1,722,791
Balance at end of period $ 24,309 $ 25,136 $ 24,309 $ 25,136