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RATE-REGULATED BUSINESSES - Assets and Liabilities (Details) - CAD
CAD in Millions
1 Months Ended 5 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Regulatory Assets        
Regulatory Assets   CAD 1,355 CAD 1,355 CAD 1,269
Less: Current portion included in Other current assets (Note 7)   33 33 85
Regulatory assets, noncurrent   1,322 1,322 1,184
Regulatory Liabilities        
Regulatory Liabilities   2,299 2,299 1,203
Less: Current portion included in Accounts payable and other (Note 14)   178 178 44
Regulated liabilities, noncurrent   2,121 2,121 1,159
Operating and debt-service regulatory liabilities        
Regulatory Liabilities        
Regulatory Liabilities   47 CAD 47 32
Remaining Recovery/ Settlement Period (years)     1 year  
Long term adjustment account        
Regulatory Liabilities        
Regulatory Liabilities   659 CAD 659 231
Remaining Recovery/ Settlement Period (years)     46 years  
Pipeline abandonment costs        
Regulatory Liabilities        
Regulatory Liabilities   541 CAD 541 285
Bridging amortization account        
Regulatory Liabilities        
Regulatory Liabilities   451 CAD 451 456
Remaining Recovery/ Settlement Period (years)     14 years  
Cost of removal        
Regulatory Liabilities        
Regulatory Liabilities   226 CAD 226 36
Other        
Regulatory Liabilities        
Regulatory Liabilities   CAD 54 54 16
Postretirement benefit costs        
Other disclosures pertaining to regulated assets and liabilities        
Regulatory liability settlement CAD 106      
Refund to customers 53      
Amount to be amortized 53      
Amortization period (in years)   3 years    
Amount to be addressed In next settlement CAD 41      
Deferred income taxes        
Regulatory Assets        
Regulatory Assets   CAD 861 861 894
Operating and debt-service regulatory assets        
Regulatory Assets        
Regulatory Assets   1 CAD 1 47
Remaining Recovery/ Settlement Period (years)     1 year  
Foreign exchange on long-term debt        
Regulatory Assets        
Regulatory Assets   37 CAD 37 54
Foreign exchange on long-term debt | Minimum        
Regulatory Assets        
Remaining Recovery/ Settlement Period (years)     1 year  
Foreign exchange on long-term debt | Maximum        
Regulatory Assets        
Remaining Recovery/ Settlement Period (years)     13 years  
Other        
Regulatory Assets        
Regulatory Assets   74 CAD 74 64
Pensions and other post retirement benefits        
Regulatory Assets        
Regulatory Assets   382 382 210
Regulatory Liabilities        
Regulatory Liabilities   180 180 0
ANR | Pensions and other post retirement benefits        
Regulatory Liabilities        
Regulatory Liabilities   CAD 141 CAD 141 CAD 147