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Other Assets - Disclosure of Components in Other Assets (Details) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of financial assets [abstract]      
Loan receivable   $ 55  
South Hedland prepaid transmission access and distribution costs $ 61 65  
Long-term prepaids and other assets 56 48  
Project development costs 10 29 $ 25
Total current other assets 4 55  
Total long-term other assets 160 142  
Total Other assets $ 164 $ 197