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Segments Disclosures - Geographic Information (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of geographical areas [line items]      
Revenues $ 2,721 $ 2,101 $ 2,347
PP&E 5,320 5,822 6,207
Right-of-use assets 95 141 146
Intangible assets 256 313 318
Other assets 142 206  
Goodwill 463 463  
Canada      
Disclosure of geographical areas [line items]      
Revenues 1,854 1,227 1,460
PP&E 4,051 4,661  
Right-of-use assets 52 107  
Intangible assets 141 185  
Other assets 15 74  
US      
Disclosure of geographical areas [line items]      
Revenues 731 716 727
PP&E 860 737  
Right-of-use assets 39 30  
Intangible assets 85 94  
Other assets 61 61  
Australia      
Disclosure of geographical areas [line items]      
Revenues 136 158 $ 160
PP&E 409 424  
Right-of-use assets 4 4  
Intangible assets 30 34  
Other assets $ 66 $ 71