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Equity - Schedule of the Equity Instrument (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Nov. 12, 2025
Aug. 25, 2024
Oct. 31, 2025
CAD ($)
Oct. 31, 2024
CAD ($)
Oct. 31, 2025
USD ($)
Oct. 31, 2025
CAD ($)
Jul. 29, 2025
USD ($)
Other Equity Instruments [member]              
Disclosure of classes of share capital [line items]              
Total     $ 7,406 $ 6,037      
4.8% AT1 Capital Notes (NVCC) [member]              
Disclosure of classes of share capital [line items]              
Face value         $ 500    
Interest rate (%)   4.80% 6.709%        
Redeemable at our option     Feb. 01, 2026        
Total     $ 658 658      
4.300% LRCNs, Series 1 [member]              
Disclosure of classes of share capital [line items]              
Interest rate (%) 4.30%            
4.300% LRCNs, Series 1 [member] | Other Equity Instruments [member]              
Disclosure of classes of share capital [line items]              
Face value           $ 1,250  
Interest rate (%)     4.30%        
Redeemable at our option     Nov. 30, 2025        
Total     $ 1,250 1,250      
5.625% LRCNs, Series 2 [member] | Other Equity Instruments [member]              
Disclosure of classes of share capital [line items]              
Face value           750  
Interest rate (%)     5.625%        
Redeemable at our option     May 31, 2027        
Total     $ 750 750      
7.325% LRCNs, Series 3 [member] | Other Equity Instruments [member]              
Disclosure of classes of share capital [line items]              
Face value           $ 1,000  
Interest rate (%)     7.325%        
Redeemable at our option     Nov. 30, 2027        
Total     $ 1,000 1,000      
7.700% LRCNs, Series 4 [member] | Other Equity Instruments [member]              
Disclosure of classes of share capital [line items]              
Face value         1,000    
Interest rate (%)     7.70%        
Redeemable at our option     May 31, 2029        
Total     $ 1,356 1,356      
7.300% LRCNs, Series 5 [member] | Other Equity Instruments [member]              
Disclosure of classes of share capital [line items]              
Face value         750    
Interest rate (%)     7.30%        
Redeemable at our option     Nov. 30, 2034        
Total     $ 1,023 $ 1,023      
6.875% LRCNs, Series 6 [member] | Other Equity Instruments [member]              
Disclosure of classes of share capital [line items]              
Face value         $ 1,000   $ 1,000
Interest rate (%)     6.875%        
Redeemable at our option     Nov. 30, 2030        
Total     $ 1,369