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Inventory - Schedule of Inventory (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Inventories [Abstract]    
Product inventory $ 611 $ 535
Materials, supplies and other 1,204 1,013
Total inventory 1,815 1,548
Cost of inventories recognised as expense during period $ 33,000 $ 22,000