v3.26.1
Equity (Summary of Classes of Share Capital - Preferred Shares and Other Equity Instruments) (Details) - CAD ($)
$ 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
Preferred Shares And Other Equity Instruments [Member]        
Disclosure of classes of share capital [line items]        
Balance at end of period (shares) 58,151,000 64,151,000 58,151,000 64,151,000
Balance at end of period $ 12,875 $ 10,788 $ 12,875 $ 10,788
Preferred shares [member]        
Disclosure of classes of share capital [line items]        
Balance at beginning of period (shares) 49,650,000 71,650,000 49,650,000 91,650,000
Redemption of shares (shares) 0 (14,000,000) 0 (34,000,000)
Balance at end of period (shares) 49,650,000 57,650,000 49,650,000 57,650,000
Balance at beginning of period $ 2,850 $ 3,400 $ 2,850 $ 3,900
Redemption of shares 0 (350) 0 (850)
Balance at end of period $ 2,850 $ 3,050 $ 2,850 $ 3,050
Other equity instruments [member]        
Disclosure of classes of share capital [line items]        
Balance at beginning of period (shares) 7,251,000 6,501,000 7,251,000 5,751,000
Balance at end of period (shares) 8,501,000 6,501,000 8,501,000 6,501,000
Balance at beginning of period $ 8,775 $ 7,738 $ 8,775 $ 6,988
Balance at end of period $ 10,025 $ 7,738 $ 10,025 $ 7,738
Other equity instruments [member] | Limited Recourse Capital Notes [Member]        
Disclosure of classes of share capital [line items]        
Issue of shares (shares) 1,250,000 0 1,250,000 750,000
Issue of shares $ 1,250 $ 0 $ 1,250 $ 750