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Other Assets Narrative (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Oct. 22, 2020
Dec. 31, 2019
Jul. 20, 2018
Disclosure of joint operations [line items]        
Loan receivable     $ 47  
Interest rate   4.07%   4.509%
Kent Hills Wind L.P.        
Disclosure of joint operations [line items]        
Loan receivable $ 52   $ 47  
Proportion of ownership interests held by non-controlling interests 17.00%      
Interest rate 4.55%