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Inventory - Schedule of Inventory (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Inventories [Abstract]    
Product inventory $ 546 $ 611
Materials, supplies and other 1,488 1,204
Total inventory 2,034 1,815
Cost of inventories recognised as expense during period $ 29,000 $ 33,000