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Post-employment benefit plans - Disclosure of Contributions to Post-Employment Benefit Plans (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of defined benefit plans [line items]    
Contributions, defined contribution plan $ (11) $ (59)
Estimated of contributions expected to be paid to plan for next annual reporting period, defined contribution plan 10  
DB pension    
Disclosure of defined benefit plans [line items]    
Estimate of contributions expected to be paid to plan for next annual reporting period, defined benefit plan 45  
OPEBs    
Disclosure of defined benefit plans [line items]    
Estimate of contributions expected to be paid to plan for next annual reporting period, defined benefit plan 60  
Plan assets    
Disclosure of defined benefit plans [line items]    
Contributions, defined benefit plan (105) (145)
Plan assets | DB pension    
Disclosure of defined benefit plans [line items]    
Contributions, defined benefit plan (41) (81)
Plan assets | OPEBs    
Disclosure of defined benefit plans [line items]    
Contributions, defined benefit plan $ (64) $ (64)