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Other Income (Expenses), Net (Details)
$ in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2016
CAD ($)
Dec. 31, 2017
CAD ($)
Dec. 31, 2016
CAD ($)
Jun. 30, 2016
USD ($)
Foreign Currency Transaction Gain (Loss), before Tax   $ (1) $ 43  
Other   2 33  
Other Nonoperating Income (Expense)   2 174  
Algonquin Power and Utilities Corporation [Member]        
Gain (Loss) on Investments   0 160  
Gain Loss On Conversion Of Subscription Receipts   0 63  
The Barbados Light and Power Company Limited [Member]        
Gain (Loss) on Investments $ 53      
Increase (Decrease) in Self Insurance Reserve   0 53  
Self Insurance Reserve 30     $ 22
Gain (Loss) On Investments After Tax $ 43      
TECO Energy Inc [Member]        
Foreign Currency Transaction Gain (Loss), before Tax   $ 0 (135)  
Convertible Subordinated Debt     $ 2,185  
Convertible debenture interest rate     4.00%