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Net Other Operating (Income) Losses (Details) - CAD
CAD in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Nov. 30, 2016
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of types of insurance contracts [line items]            
Alberta off-coal agreement, annual cash payments, gross     CAD 40   CAD 0 CAD 0
Alberta off-coal agreement, annual cash payments, net     37      
Mississauga cogeneration facility NUG Contract     9 CAD 191 0  
Discounted revenue       207    
Contract expenses and termination charges       16    
Accelerated depreciation       46    
Cash Flow Hedge Unrealized Gains (Losses) From AOCI Recognized in Profit or Loss       14    
Repayment of economic benefit   CAD 31   27    
Professional fees expense       4    
Administrative penalty       25    
Payment of administrative penalty CAD 25          
Insurance recoveries     0 3 31  
Market Surveillance Administrator Agreement settlement     CAD 0 0 56  
Business interruption [member]            
Disclosure of types of insurance contracts [line items]            
Insurance recoveries       2 6  
Wind Generation | Replacement and Refurbishment [Member]            
Disclosure of types of insurance contracts [line items]            
Insurance recoveries       CAD 1    
Coal generation | Replacement and Refurbishment [Member]            
Disclosure of types of insurance contracts [line items]            
Insurance recoveries         7  
Hydro | Replacement and Refurbishment [Member]            
Disclosure of types of insurance contracts [line items]            
Insurance recoveries         18  
Hydro | Operations, maintenance, and administration            
Disclosure of types of insurance contracts [line items]            
Insurance recoveries         CAD 12