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Post-employment benefit plans - Interest Cost (Details) - CAD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Disclosure of defined benefit plans [line items]        
Total net return on post-employment benefit plans $ 36 $ 26 $ 73 $ 51
DB pension        
Disclosure of defined benefit plans [line items]        
Total net return on post-employment benefit plans 43 33 88 66
OPEBs        
Disclosure of defined benefit plans [line items]        
Total net return on post-employment benefit plans $ (7) $ (7) $ (15) $ (15)