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Segments Disclosures - Geographic Information (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of geographical areas [line items]      
Total revenue from contracts with customers $ 2,845 $ 3,355 $ 2,976
Property, plant and equipment 6,020 5,714 5,556
Right-of-use assets 120 117 126
Intangible assets other than goodwill 281 223 252
Total long-term other assets 179 179  
Canada      
Disclosure of geographical areas [line items]      
Total revenue from contracts with customers 2,009 2,218 1,905
Property, plant and equipment 3,828 3,578  
Right-of-use assets 41 43  
Intangible assets other than goodwill 170 108  
Total long-term other assets 85 68  
U.S.      
Disclosure of geographical areas [line items]      
Total revenue from contracts with customers 676 987 940
Property, plant and equipment 1,852 1,749  
Right-of-use assets 74 71  
Intangible assets other than goodwill 86 88  
Total long-term other assets 36 42  
Western Australia      
Disclosure of geographical areas [line items]      
Total revenue from contracts with customers 160 150 $ 131
Property, plant and equipment 340 387  
Right-of-use assets 5 3  
Intangible assets other than goodwill 25 27  
Total long-term other assets $ 58 $ 69