v3.22.2.2
Employee benefits - Pension and other post-employment benefits - Analysis of Financial Position Related to Pension and Other Post-employment Benefit Plans (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2022
Oct. 31, 2021
Amounts recognized in our Consolidated Balance Sheets    
Employee benefit assets $ 3,331 $ 2,640
Defined benefit pension plans [member]    
Disclosure of employee benefits [line items]    
Fair value of plan assets 15,026 17,703
Present value of defined benefit obligation 11,893 15,315
Net surplus (deficit) 3,133 2,388
Effect of asset ceiling (8) (6)
Total net surplus (deficit), net of effect of asset ceiling 3,125 2,382
Amounts recognized in our Consolidated Balance Sheets    
Employee benefit assets 3,331 2,640
Employee benefit liabilities (206) (258)
Total net surplus (deficit), net of effect of asset ceiling 3,125 2,382
Defined benefit pension plans [member] | Canada [member]    
Disclosure of employee benefits [line items]    
Fair value of plan assets 14,310 16,698
Present value of defined benefit obligation 11,271 14,403
Net surplus (deficit) 3,039 2,295
Defined benefit pension plans [member] | Foreign countries [member]    
Disclosure of employee benefits [line items]    
Fair value of plan assets 716 1,005
Present value of defined benefit obligation 622 912
Net surplus (deficit) 94 93
Other post employment benefit plan [member]    
Disclosure of employee benefits [line items]    
Present value of defined benefit obligation 1,462 1,780
Net surplus (deficit) (1,462) (1,780)
Total net surplus (deficit), net of effect of asset ceiling (1,462) (1,780)
Amounts recognized in our Consolidated Balance Sheets    
Employee benefit liabilities (1,462) (1,780)
Total net surplus (deficit), net of effect of asset ceiling (1,462) (1,780)
Other post employment benefit plan [member] | Canada [member]    
Disclosure of employee benefits [line items]    
Present value of defined benefit obligation 1,387 1,703
Net surplus (deficit) (1,387) (1,703)
Other post employment benefit plan [member] | Foreign countries [member]    
Disclosure of employee benefits [line items]    
Present value of defined benefit obligation 75 77
Net surplus (deficit) $ (75) $ (77)