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Goodwill and Intangible Assets - Summary of Intangible Assets (Parenthetical) (Detail) - CAD ($)
$ in Millions
Oct. 31, 2025
Oct. 31, 2024
Oct. 31, 2023
Statement [Line Items]      
Intangible assets other than goodwill $ 4,758 $ 4,925  
Gross carrying amount [member]      
Statement [Line Items]      
Intangible assets other than goodwill 11,825 11,516 $ 12,370
Accumulated depreciation and amortisation [member]      
Statement [Line Items]      
Intangible assets other than goodwill (7,067) (6,591) $ (7,154)
Internally generated [member] | Software amortizing [member] | Gross carrying amount [member]      
Statement [Line Items]      
Intangible assets other than goodwill 5,752 5,466  
Internally generated [member] | Software amortizing [member] | Accumulated depreciation and amortisation [member]      
Statement [Line Items]      
Intangible assets other than goodwill $ (3,760) $ (3,653)