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RELATED PARTY TRANSACTIONS (Details) - CAD
CAD in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
RELATED PARTY TRANSACTIONS    
Service charges CAD 332 CAD 256
Lease arrangement expenses 151 21
Purchase of natural gas by wholly owned subsidiaries 228 315
Sale of natural gas by wholly owned subsidiaries 5 58
Amounts receivable from affiliates 152 183
Vector Pipeline joint venture    
RELATED PARTY TRANSACTIONS    
Service charges 7 7
Amounts receivable from affiliates CAD 149 183
Vector Pipeline joint venture | Minimum    
RELATED PARTY TRANSACTIONS    
Annual interest rate on the loans (as a percent) 4.00%  
Vector Pipeline joint venture | Maximum    
RELATED PARTY TRANSACTIONS    
Annual interest rate on the loans (as a percent) 12.00%  
Other affiliates    
RELATED PARTY TRANSACTIONS    
Amounts receivable from affiliates CAD 3 CAD 0