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Equity - Summary of Classes of Preferred and Common Shares Outstanding (Parenthetical) (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Nov. 12, 2025
Oct. 31, 2025
USD ($)
shares
Oct. 31, 2025
CAD ($)
shares
Jul. 29, 2025
USD ($)
Oct. 31, 2024
shares
4.300% LRCNs, Series 1 [member]          
Disclosure of classes of share capital [line items]          
Interest Rate 4.30%        
Other Equity Instruments [member] | 4.300% LRCNs, Series 1 [member]          
Disclosure of classes of share capital [line items]          
Note issued face value     $ 1,250    
Interest Rate   4.30%      
Other Equity Instruments [member] | 6.875% LRCNs, Series 6 [member]          
Disclosure of classes of share capital [line items]          
Note issued face value   $ 1,000   $ 1,000  
Interest Rate   6.875%      
Treasury shares [member]          
Disclosure of classes of share capital [line items]          
Number of shares | shares   0 0   55,172