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Equity (Summary of Classes of Share Capital - Treasury Shares) (Details) - CAD ($)
shares in Thousands, $ in Millions
 12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Disclosure of classes of share capital [line items]    
Balance at beginning of year $ 115,160  
Balance at end of year 127,827 $ 115,160
Common shares [member]    
Disclosure of classes of share capital [line items]    
Balance at beginning of year 25,373 25,434
Balance at end of year $ 24,727 $ 25,373
Common shares [member] | Treasury shares [member]    
Disclosure of classes of share capital [line items]    
Beginning balance, Number of shares 213 748
Purchase of shares, Number of shares 145,166 139,135
Sale of shares, Number of shares (145,379) (139,670)
Ending balance, Number of shares 0 213
Balance at beginning of year $ (17) $ (64)
Purchase of shares, Amount (13,094) (11,209)
Sale of shares, Amount 13,111 11,256
Balance at end of year 0 (17)
Preferred shares and other equity instruments [member]    
Disclosure of classes of share capital [line items]    
Balance at beginning of year 10,888 10,853
Balance at end of year $ 11,625 $ 10,888
Preferred shares and other equity instruments [member] | Treasury shares [member]    
Disclosure of classes of share capital [line items]    
Beginning balance, Number of shares 163 142
Purchase of shares, Number of shares 4,614 6,556
Sale of shares, Number of shares (4,748) (6,535)
Ending balance, Number of shares 29 163
Balance at beginning of year $ (18) $ (65)
Purchase of shares and other equity instruments (1,535) (625)
Sale of shares and other equity instruments 1,549 672
Balance at end of year $ (4) $ (18)