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DEBT - Credit Facilities (Narrative) (Details)
¥ in Millions, CAD in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2017
CAD
Dec. 31, 2017
CAD
Mar. 31, 2017
JPY (¥)
Dec. 31, 2016
CAD
Line of Credit Facility [Line Items]        
Weighted average standby fee (as a percent)   0.20%    
Long-term debt   CAD 60,865   CAD 36,494
Uncommitted credit facilities        
Line of Credit Facility [Line Items]        
Term credit facility   792   335
Unutilized credit facility   518   177
Japanese banks        
Line of Credit Facility [Line Items]        
Term of credit facility 5 years      
Term credit facility CAD 239   ¥ 20,000  
Commercial paper and credit facility draws        
Line of Credit Facility [Line Items]        
Long-term debt   CAD 10,055   CAD 7,344