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LONG-TERM INVESTMENTS (Details)
€ in Millions, CAD in Millions
3 Months Ended
Jun. 30, 2016
CAD
Jun. 30, 2016
EUR (€)
Jun. 30, 2016
CAD
May 19, 2016
item
Eolien Maritime France SAS        
LONG TERM INVESTMENTS        
Ownership Interest (as a percent)       50.00%
Number of licenses for large-scale wind farms | item       3
Long term investments and deferred amounts and other assets   € 128 CAD 181  
Eolien Maritime France SAS | Long Term Investment        
LONG TERM INVESTMENTS        
Long term investments and deferred amounts and other assets     60  
Eolien Maritime France SAS | Deferred Amounts And Other Assets        
LONG TERM INVESTMENTS        
Long term investments and deferred amounts and other assets     CAD 121  
Eddystone Rail Company, LLC        
LONG TERM INVESTMENTS        
Ownership Interest (as a percent)   75.00% 75.00%  
Investment impairment CAD 176