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Other Assets (Details) - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of financial assets [abstract]    
South Hedland prepaid transmission access and distribution costs $ 67 $ 72
Deferred licence fees 9 11
Project development costs 19 47
Deferred service costs 0 12
Long-term prepaids and other assets 56 55
Loan receivable 47 37
Total other assets $ 198 $ 234