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Other Assets Narrative (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of joint operations [line items]    
Current portion of loan receivable (Note 20) $ 0 $ 5
Consideration received 10  
Financial liabilities 3,267 3,707
Non-current portion of non-current loans received $ 37 33
TAMA Power [Member]    
Disclosure of joint operations [line items]    
Proportion of ownership interest in joint operation 50.00%  
Kent Hills Wind L.P.    
Disclosure of joint operations [line items]    
Proportion of ownership interests held by non-controlling interests 17.00%  
Interest rate 4.55%  
Long-term Debt1 [Member]    
Disclosure of joint operations [line items]    
Financial liabilities $ 3,204 3,638
Recurring fair value measurement | Financial liabilities at fair value through profit or loss, category [member] | Long-term Debt1 [Member]    
Disclosure of joint operations [line items]    
Financial liabilities 3,181 3,708
Level 2 of fair value hierarchy [member] | Recurring fair value measurement | Financial liabilities at fair value through profit or loss, category [member] | Long-term Debt1 [Member]    
Disclosure of joint operations [line items]    
Financial liabilities 3,181 3,708
Level 2 of fair value hierarchy [member] | Recurring fair value measurement | Financial liabilities at fair value through profit or loss, category [member] | Long-term Debt1 [Member] | Kent Hills Wind L.P.    
Disclosure of joint operations [line items]    
Financial liabilities 37 $ 38
Other assets | Loans and receivables    
Disclosure of joint operations [line items]    
Non-current portion of non-current loans received $ 37