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Segments Disclosures - Geographic Information (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of geographical areas [line items]      
Total revenue from contracts with customers $ 3,355 $ 2,976 $ 2,721
Property, plant and equipment 5,714 5,556 5,320
Right-of-use assets 117 126 95
Intangible assets other than goodwill 223 252 256
Total long-term other assets 179 160  
Canada      
Disclosure of geographical areas [line items]      
Total revenue from contracts with customers 2,218 1,905 1,854
Property, plant and equipment 3,578 3,817  
Right-of-use assets 43 49  
Intangible assets other than goodwill 108 123  
Total long-term other assets 68 62  
US      
Disclosure of geographical areas [line items]      
Total revenue from contracts with customers 987 940 731
Property, plant and equipment 1,749 1,307  
Right-of-use assets 71 74  
Intangible assets other than goodwill 88 101  
Total long-term other assets 42 34  
Australia      
Disclosure of geographical areas [line items]      
Total revenue from contracts with customers 150 131 $ 136
Property, plant and equipment 387 432  
Right-of-use assets 3 3  
Intangible assets other than goodwill 27 28  
Total long-term other assets $ 69 $ 64