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RATE-REGULATED BUSINESSES - Assets and Liabilities (Details)
$ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2006
CAD ($)
Dec. 31, 2006
USD ($)
Regulatory Assets          
Regulatory Assets $ 1,631   $ 1,630    
Less: Current portion included in Other current assets (Note 7) 83   43    
Regulatory Assets, noncurrent 1,548   1,587    
Regulatory Liabilities          
Regulatory Liabilities 4,521   4,468    
Less: Current portion included in Accounts payable and other (Note 15) 591   696    
Regulatory Liabilities, noncurrent 3,930   3,772    
Operating and debt-service regulatory liabilities          
Regulatory Liabilities          
Regulatory Liabilities 96   $ 139    
Remaining Recovery/ Settlement Period (years)     1 year    
Pensions and other post retirement benefits | ANR PIPELINE COMPANY          
Regulatory Liabilities          
Regulatory Liabilities 54   $ 41    
Long term adjustment account          
Regulatory Liabilities          
Regulatory Liabilities 1,015   $ 660    
Long term adjustment account | Minimum          
Regulatory Liabilities          
Remaining Recovery/ Settlement Period (years)     1 year    
Long term adjustment account | Maximum          
Regulatory Liabilities          
Remaining Recovery/ Settlement Period (years)     47 years    
Long term adjustment account, amount to be amortized over one year          
Regulatory Liabilities          
Regulatory Liabilities     $ 488    
Remaining Recovery/ Settlement Period (years)     47 years    
Bridging amortization account          
Regulatory Liabilities          
Regulatory Liabilities 305   $ 428    
Remaining Recovery/ Settlement Period (years)     11 years    
Pipeline abandonment trust balance          
Regulatory Liabilities          
Regulatory Liabilities 1,113   $ 1,462    
Cost of removal          
Regulatory Liabilities          
Regulatory Liabilities 261   253    
Deferred income taxes          
Regulatory Liabilities          
Regulatory Liabilities 165   151    
Deferred income taxes - U.S. Tax Reform          
Regulatory Liabilities          
Regulatory Liabilities 1,394   1,239    
Other          
Regulatory Liabilities          
Regulatory Liabilities 65   60    
Postretirement benefit costs | ANR PIPELINE COMPANY          
Other disclosures pertaining to regulated assets and liabilities          
Regulatory liability settlement 11 $ 8      
Amount to be addressed In next settlement       $ 41 $ 32
Deferred income taxes          
Regulatory Assets          
Regulatory Assets 1,051   1,088    
Operating and debt-service regulatory assets          
Regulatory Assets          
Regulatory Assets 12   $ 2    
Remaining Recovery/ Settlement Period (years)     1 year    
Pensions and other post retirement benefits          
Regulatory Assets          
Regulatory Assets 379   $ 417    
Regulatory Liabilities          
Regulatory Liabilities 53   35    
Foreign exchange on long-term debt          
Regulatory Assets          
Regulatory Assets 46   $ 16    
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)     10 years    
Other          
Regulatory Assets          
Regulatory Assets $ 143   $ 107