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Post-employment benefit plans - Components of Post-Employment Benefit Plans Financing Cost (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of net defined benefit liability (asset) [line items]    
Total net return on post-employment benefit plans $ 108 $ 51
DB pension    
Disclosure of net defined benefit liability (asset) [line items]    
Total net return on post-employment benefit plans 149 84
OPEBs    
Disclosure of net defined benefit liability (asset) [line items]    
Total net return on post-employment benefit plans $ (41) $ (33)