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Post-employment benefit plans - Interest Cost (Details) - CAD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Disclosure of defined benefit plans [line items]        
Total net return on post-employment benefit plans $ 17 $ 27 $ 33 $ 54
DB pension        
Disclosure of defined benefit plans [line items]        
Total net return on post-employment benefit plans 25 37 49 74
OPEBs        
Disclosure of defined benefit plans [line items]        
Total net return on post-employment benefit plans $ (8) $ (10) $ (16) $ (20)