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employee future benefits - Disaggregation of defined benefit pension (Details) - Pension plans - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of net defined benefit liability (asset)    
Plan assets $ 8,262 $ 8,352
PBSR prior year interim estimate of solvency position   $ 1,910
PBSR composite weighted average discount rate 4.70% 4.60%
Hypothetical basis points decrease in PBSR composite weighted average discount rate (as a per cent) 0.25% 0.25%
Decrease in the PBSR solvency position with hypothetical decrease of 25 basis points in the composite weighted average discount rate $ 198 $ 207
Minimum    
Disclosure of net defined benefit liability (asset)    
PBSR interim solvency ratio 120.00% 117.00%
PBSR annual solvency ratio   115.00%
PBSR interim three-year solvency ratio 116.00% 112.00%
PBSR annual three-year solvency ratio   112.00%
Maximum    
Disclosure of net defined benefit liability (asset)    
PBSR interim solvency ratio 138.00% 131.00%
PBSR annual solvency ratio   129.00%
PBSR interim three-year solvency ratio 132.00% 126.00%
PBSR annual three-year solvency ratio   125.00%
Pension plan | Present value of the defined benefit obligations    
Disclosure of net defined benefit liability (asset)    
Defined benefit obligations accrued $ (8,452) $ (8,489)
Pension plan | Present value netting plan assets and defined benefit obligation [member]    
Disclosure of net defined benefit liability (asset)    
PBSR interim estimate of solvency position 2,304  
PBSR prior year update of annual estimate of solvency position   1,856
Pension plan | Active members | Present value of the defined benefit obligations    
Disclosure of net defined benefit liability (asset)    
Defined benefit obligations accrued (1,622) (1,815)
Pension plan | Deferred members | Present value of the defined benefit obligations    
Disclosure of net defined benefit liability (asset)    
Defined benefit obligations accrued (403) (382)
Pension plan | Pensioners | Present value of the defined benefit obligations    
Disclosure of net defined benefit liability (asset)    
Defined benefit obligations accrued (6,427) (6,292)
Pension plan | Pension plans that have plan assets in excess of defined benefit obligations accrued | Present value netting plan assets and defined benefit obligation [member]    
Disclosure of net defined benefit liability (asset)    
PBSR interim estimate of solvency position $ 2,304  
PBSR prior year update of annual estimate of solvency position   $ 1,856