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Employee Compensation - Pension and Other Employee Future Benefits - Summary of Plan Information for Past Two Years (Detail) - CAD ($)
$ in Millions
Oct. 31, 2025
Oct. 31, 2024
Disclosure of defined benefit plans [line items]    
Fair value of plan assets $ 9,456 $ 9,156
Pension Plans [member]    
Disclosure of defined benefit plans [line items]    
Defined benefit obligation 8,582 8,365
Fair value of plan assets 9,708 9,431
Net surplus (deficit) is compromised of:    
Net surplus (deficit), net of the effect of the asset ceiling 1,126 1,063
Pension Plans [member] | Funded plans [member]    
Net surplus (deficit) is compromised of:    
Net surplus (deficit), net of the effect of the asset ceiling 1,271 1,223
Pension Plans [member] | Unfunded plans [member]    
Net surplus (deficit) is compromised of:    
Net surplus (deficit), net of the effect of the asset ceiling (145) (160)
Pension Plans [member] | Before effect of asset ceiling [member]    
Net surplus (deficit) is compromised of:    
Net surplus (deficit), net of the effect of the asset ceiling 1,126 1,066
Pension Plans [member] | Effect of asset ceiling [member]    
Net surplus (deficit) is compromised of:    
Net surplus (deficit), net of the effect of the asset ceiling 0 (3)
Other employee future benefit plans [member]    
Disclosure of defined benefit plans [line items]    
Defined benefit obligation 950 954
Fair value of plan assets 248 245
Net surplus (deficit) is compromised of:    
Net surplus (deficit), net of the effect of the asset ceiling (776) (819)
Other employee future benefit plans [member] | Funded plans [member]    
Net surplus (deficit) is compromised of:    
Net surplus (deficit), net of the effect of the asset ceiling 87 44
Other employee future benefit plans [member] | Unfunded plans [member]    
Net surplus (deficit) is compromised of:    
Net surplus (deficit), net of the effect of the asset ceiling (863) (863)
Other employee future benefit plans [member] | Before effect of asset ceiling [member]    
Net surplus (deficit) is compromised of:    
Net surplus (deficit), net of the effect of the asset ceiling (702) (709)
Other employee future benefit plans [member] | Effect of asset ceiling [member]    
Net surplus (deficit) is compromised of:    
Net surplus (deficit), net of the effect of the asset ceiling $ (74) $ (110)