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Other Assets (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of financial assets [abstract]    
South Hedland prepaid transmission access and distribution costs $ 70 $ 67
Deferred licence fees 0 9
Project development costs 25 19
Long-term prepaids and other assets 59 56
Loan receivable   47
Total other assets $ 206 $ 198