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Net Other Operating (Income) Losses (Details) - CAD ($)
$ in Millions
 12 Months Ended
Jul. 20, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of types of insurance contracts [line items]        
Alberta off-coal agreement, annual cash payments, gross $ 40 $ 40 $ 40 $ 40
Alberta off-coal agreement, annual cash payments, net $ 37      
Mississauga cogeneration facility NUG Contract   1 0 9
Insurance recoveries   $ 10 7 $ 0
Canadian Coal | 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