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Business acquisition (Details) - CAD ($)
$ in Millions
3 Months Ended 5 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2022
Jun. 30, 2021
Feb. 28, 2022
Disclosure of detailed information about business combination [line items]            
Operating revenues $ 5,861 $ 5,698   $ 11,711 $ 11,404  
EBOX            
Disclosure of detailed information about business combination [line items]            
Consideration transferred, acquisition-date fair value           $ 153
Cash consideration           $ 139
Operating revenues     $ 18