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Post-employment benefit plans - Funded Status of Post-Employment Benefit Plans Cost (Details) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of defined benefit plans [line items]    
Post-employment benefit asset (liability) $ (1,657) $ (2,248)
Plan asset (deficit)    
Disclosure of defined benefit plans [line items]    
Post-employment benefit asset (liability) (2,429) (3,249)
Plan asset (deficit) | Defined Benefit Plan and OPEB    
Disclosure of defined benefit plans [line items]    
Present value of post-employment benefit obligations (21,669) (20,433)
Fair value of plan assets 24,098 23,682
Plan surplus (deficit) 2,429 3,249
Post-employment benefit asset (liability) 1,657 2,248
Plan asset (deficit) | FUNDED | Defined Benefit Plan and OPEB    
Disclosure of defined benefit plans [line items]    
Present value of post-employment benefit obligations (20,004) (18,741)
Fair value of plan assets 23,703 23,291
Plan surplus (deficit) 3,699 4,550
Post-employment benefit asset (liability) 2,927 3,549
Plan asset (deficit) | PARTIALLY FUNDED | Defined Benefit Plan and OPEB    
Disclosure of defined benefit plans [line items]    
Present value of post-employment benefit obligations (1,453) (1,461)
Fair value of plan assets 395 391
Plan surplus (deficit) (1,058) (1,070)
Post-employment benefit asset (liability) (1,058) (1,070)
Plan asset (deficit) | UNFUNDED | Defined Benefit Plan and OPEB    
Disclosure of defined benefit plans [line items]    
Present value of post-employment benefit obligations (212) (231)
Fair value of plan assets 0 0
Plan surplus (deficit) (212) (231)
Post-employment benefit asset (liability) (212) (231)
Effect of asset limit    
Disclosure of defined benefit plans [line items]    
Post-employment benefit asset (liability) 719 980
Effect of asset limit | Defined Benefit Plan and OPEB    
Disclosure of defined benefit plans [line items]    
Effect of asset limit (772) (1,001)
Effect of asset limit | FUNDED | Defined Benefit Plan and OPEB    
Disclosure of defined benefit plans [line items]    
Effect of asset limit (772) (1,001)
Effect of asset limit | PARTIALLY FUNDED | Defined Benefit Plan and OPEB    
Disclosure of defined benefit plans [line items]    
Effect of asset limit 0 0
Effect of asset limit | UNFUNDED | Defined Benefit Plan and OPEB    
Disclosure of defined benefit plans [line items]    
Effect of asset limit $ 0 $ 0