v3.26.1
Equity (Summary of Classes of Share Capital - Preferred Shares and Other Equity Instruments) (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
Preferred Shares And Other Equity Instruments [Member]        
Disclosure of classes of share capital [line items]        
Balance at end of period (shares) 56,901 78,151 56,901 78,151
Balance at end of period $ 11,625 $ 11,138 $ 11,625 $ 11,138
Preferred shares [member]        
Disclosure of classes of share capital [line items]        
Balance at beginning of period (shares) 49,650 71,650 49,650 91,650
Redemption of shares (shares) 0 0 0 (20,000)
Balance at end of period (shares) 49,650 71,650 49,650 71,650
Balance at beginning of period $ 2,850 $ 3,400 $ 2,850 $ 3,900
Redemption of shares 0 0 0 (500)
Balance at end of period $ 2,850 $ 3,400 $ 2,850 $ 3,400
Other equity instruments [member]        
Disclosure of classes of share capital [line items]        
Balance at beginning of period (shares) 7,251 6,501 7,251 5,751
Balance at end of period (shares) 7,251 6,501 7,251 6,501
Balance at beginning of period $ 8,775 $ 7,738 $ 8,775 $ 6,988
Balance at end of period $ 8,775 $ 7,738 $ 8,775 $ 7,738
Other equity instruments [member] | Limited Recourse Capital Notes [Member]        
Disclosure of classes of share capital [line items]        
Issue of shares (shares) 0 0 0 750
Issue of shares $ 0 $ 0 $ 0 $ 750