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Net Other Operating Income (Details) - CAD ($)
$ in Millions
 12 Months Ended
Jul. 20, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of types of insurance contracts [line items]        
Onerous contracts provision   $ 29    
Alberta off-coal agreement, annual cash payments, gross $ 40 40 $ 40 $ 40
Alberta off-coal agreement, annual cash payments, net $ 37      
Insurance recoveries   $ 0 $ 10 7
Alberta Thermal | Equipment Repair [Member]        
Disclosure of types of insurance contracts [line items]        
Insurance recoveries       1
Wyoming Wind [Member]        
Disclosure of types of insurance contracts [line items]        
Insurance recoveries       $ 6