v3.22.2.2
Equity - Summary of Common and Preferred Shares and Other Equity Instruments Outstanding (Detail)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Oct. 31, 2022
CAD ($)
$ / shares
shares
Oct. 31, 2022
$ / shares
Oct. 31, 2021
CAD ($)
$ / shares
shares
Oct. 31, 2021
$ / shares
Disclosure of classes of share capital [line items]        
Balance at beginning of period $ 98,762   $ 86,767  
Issued in connection with share-based compensation plans 848   2,345  
Purchased for cancellation (5,426)      
Balance at end of period 108,175   98,762  
Purchases (5,701)   (4,743)  
Sales $ 5,474   $ 4,763  
Common shares [member] | Issued capital [member]        
Disclosure of classes of share capital [line items]        
Balance at beginning of period | shares 1,425,187   1,423,861  
Issued in connection with share-based compensation plans | shares 1,270   1,326  
Purchased for cancellation | shares (40,866)      
Balance at end of period | shares 1,385,591   1,425,187  
Balance at beginning of period $ 17,728   $ 17,628  
Issued in connection with share-based compensation plans 99   100  
Purchased for cancellation (509)      
Balance at end of period $ 17,318   $ 17,728  
Balance at end of period | $ / shares $ 4.96   $ 4.32  
Common shares [member] | Treasury shares [member]        
Disclosure of classes of share capital [line items]        
Balance at beginning of period | shares (662)   (1,388)  
Balance at end of period | shares (2,680)   (662)  
Balance at beginning of period $ (73)   $ (129)  
Balance at end of period $ (334)   $ (73)  
Purchases | shares (48,437)   (37,603)  
Sales | shares 46,419   38,329  
Purchases $ (5,183)   $ (4,060)  
Sales $ 4,922   $ 4,116  
Common shares [member] | Outstanding capital [member]        
Disclosure of classes of share capital [line items]        
Balance at beginning of period | shares 1,424,525      
Balance at end of period | shares 1,382,911   1,424,525  
Balance at beginning of period $ 17,655      
Balance at end of period $ 16,984   $ 17,655  
Preferred shares [member] | Issued capital [member]        
Disclosure of classes of share capital [line items]        
Balance at beginning of period | shares 112,015      
Balance at end of period | shares 106,765   112,015  
Balance at beginning of period $ 6,723   $ 5,948  
Issued in connection with share-based compensation plans 750   2,250  
Balance at end of period $ 7,323   $ 6,723  
Preferred shares [member] | Treasury shares [member]        
Disclosure of classes of share capital [line items]        
Balance at beginning of period | shares (164)   (2)  
Balance at end of period | shares (12)   (164)  
Balance at beginning of period $ (39)   $ (3)  
Balance at end of period $ (5)   $ (39)  
Purchases | shares (2,811)   (6,306)  
Sales | shares 2,963   6,144  
Purchases $ (518)   $ (683)  
Sales 552   647  
Preferred shares [member] | Outstanding capital [member]        
Disclosure of classes of share capital [line items]        
Balance at beginning of period 6,684      
Balance at end of period $ 7,318   $ 6,684  
Balance at end of period | shares 106,753   111,851  
Series BH non-cumulative fixed rate first preference shares [member]        
Disclosure of classes of share capital [line items]        
Balance at beginning of period | shares 6,000      
Balance at end of period | shares 6,000   6,000  
Balance at beginning of period $ 150      
Balance at end of period $ 150   $ 150  
Dividends declared per share | $ / shares $ 1.23   $ 1.23  
Series BI non-cumulative fixed rate first preference shares [member]        
Disclosure of classes of share capital [line items]        
Balance at beginning of period | shares 6,000      
Balance at end of period | shares 6,000   6,000  
Balance at beginning of period $ 150      
Balance at end of period $ 150   $ 150  
Dividends declared per share | $ / shares $ 1.23   $ 1.23  
Series BJ non-cumulative fixed rate first preference shares [member]        
Disclosure of classes of share capital [line items]        
Balance at beginning of period | shares 6,000      
Balance at end of period | shares     6,000  
Balance at beginning of period $ 150      
Balance at end of period     $ 150  
Dividends declared per share | $ / shares $ 0.33   $ 1.31  
Series AZ non-cumulative 5-year rate reset first preference shares [member]        
Disclosure of classes of share capital [line items]        
Balance at beginning of period | shares 20,000      
Balance at end of period | shares 20,000   20,000  
Balance at beginning of period $ 500      
Balance at end of period $ 500   $ 500  
Dividends declared per share | $ / shares $ 0.93   $ 0.93  
Series BB non-cumulative 5-year rate reset first preference shares [member]        
Disclosure of classes of share capital [line items]        
Balance at beginning of period | shares 20,000      
Balance at end of period | shares 20,000   20,000  
Balance at beginning of period $ 500      
Balance at end of period $ 500   $ 500  
Dividends declared per share | $ / shares $ 0.91   $ 0.91  
Series BD non-cumulative 5-year rate reset first preference shares [member]        
Disclosure of classes of share capital [line items]        
Balance at beginning of period | shares 24,000      
Balance at end of period | shares 24,000   24,000  
Balance at beginning of period $ 600      
Balance at end of period $ 600   $ 600  
Dividends declared per share | $ / shares $ 0.8   $ 0.8  
Series BF non-cumulative 5-year rate reset first preference shares [member]        
Disclosure of classes of share capital [line items]        
Balance at beginning of period | shares 12,000      
Balance at end of period | shares 12,000   12,000  
Balance at beginning of period $ 300      
Balance at end of period $ 300   $ 300  
Dividends declared per share | $ / shares $ 0.75   $ 0.75  
Series BO non-cumulative five year rate reset first preference shares [Member]        
Disclosure of classes of share capital [line items]        
Balance at beginning of period | shares 14,000      
Balance at end of period | shares 14,000   14,000  
Balance at beginning of period $ 350      
Balance at end of period $ 350   $ 350  
Dividends declared per share | $ / shares $ 1.2   $ 1.2  
Series BT non-cumulative five year rate reset first preference shares [member]        
Disclosure of classes of share capital [line items]        
Balance at end of period | shares 750      
Balance at end of period $ 750      
Dividends declared per share | $ / shares $ 4.2      
Series C2 non-cumulative fixed rate/floating first preferred shares [member]        
Disclosure of classes of share capital [line items]        
Balance at beginning of period | shares 15      
Balance at end of period | shares 15   15  
Balance at beginning of period $ 23      
Balance at end of period $ 23   $ 23  
Dividends declared per share | $ / shares   $ 67.5   $ 67.5
Series 1 limited recourse capital notes [member] | Issued capital [member]        
Disclosure of classes of share capital [line items]        
Balance at beginning of period | shares 1,750      
Balance at end of period | shares 1,750   1,750  
Balance at beginning of period $ 1,750      
Balance at end of period $ 1,750   $ 1,750  
dividends declared per share 4.50% 4.50% 4.50% 4.50%
Series 2 limited recourse capital notes [member] | Issued capital [member]        
Disclosure of classes of share capital [line items]        
Balance at beginning of period | shares 1,250      
Balance at end of period | shares 1,250   1,250  
Balance at beginning of period $ 1,250      
Balance at end of period $ 1,250   $ 1,250  
dividends declared per share 4.00% 4.00% 4.00% 4.00%
Series 3 limited recourse capital notes [member] | Issued capital [member]        
Disclosure of classes of share capital [line items]        
Balance at beginning of period | shares 1,000      
Balance at end of period | shares 1,000   1,000  
Balance at beginning of period $ 1,000      
Balance at end of period $ 1,000   $ 1,000  
dividends declared per share 3.65% 3.65% 3.65% 3.65%