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Post-employee benefit plans - Interest Cost (Details) - CAD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Disclosure of net defined benefit liability (asset) [line items]        
Total net return (interest) on post-employment benefit plans $ 7 $ (5) $ 25 $ (10)
DB pension        
Disclosure of net defined benefit liability (asset) [line items]        
Total net return (interest) on post-employment benefit plans 16 2 42 5
OPEBs        
Disclosure of net defined benefit liability (asset) [line items]        
Total net return (interest) on post-employment benefit plans $ (9) $ (7) $ (17) $ (15)