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EQUITY INVESTMENTS - Schedule and Narrative (Details)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
May 01, 2016
USD ($)
Oct. 31, 2017
CAD
Aug. 31, 2017
CAD
Mar. 31, 2016
USD ($)
Mar. 31, 2016
CAD
Dec. 31, 2017
CAD
Dec. 31, 2016
CAD
Dec. 31, 2015
CAD
Dec. 31, 2017
USD ($)
Jun. 02, 2017
Jun. 01, 2017
Dec. 31, 2016
USD ($)
Equity Investments                        
Income/(Loss) from Equity Investments           CAD 773,000,000 CAD 514,000,000 CAD 440,000,000        
Equity Investments           6,366,000,000 6,544,000,000          
Distributions received from equity investments           1,332,000,000 1,571,000,000 802,000,000        
Returns of capital           362,000,000 727,000,000 9,000,000        
Undistributed earnings               198,000,000        
Contributions to equity investments           CAD 1,681,000,000 765,000,000 CAD 493,000,000        
Iroquois                        
Equity Investments                        
Ownership interest (percent) 50.00%     49.35% 49.35%              
Additional ownership acquired (percent) 0.65%     4.87% 4.87%              
Contributions to equity investments | $ $ 7     $ 54                
Sur de Texas                        
Equity Investments                        
Ownership interest (percent)           60.00%     60.00%      
Contributions to equity investments           CAD 977,000,000            
TransGas                        
Equity Investments                        
Ownership interest (percent)     46.50%                  
Asset impairment charges     CAD 12,000,000                  
Contract term     20 years                  
Grand Rapids                        
Equity Investments                        
Difference between the carrying value of the investment and the underlying equity in the net assets | $                 $ 105     $ 86
Bruce Power                        
Equity Investments                        
Ownership interest (percent)               48.50%        
Canadian Natural Gas Pipelines | TQM                        
Equity Investments                        
Ownership interest (percent)           50.00%     50.00%      
Income/(Loss) from Equity Investments           CAD 11,000,000 12,000,000 CAD 12,000,000        
Equity Investments           CAD 68,000,000 71,000,000          
U.S. Natural Gas Pipelines | Northern Border                        
Equity Investments                        
Ownership interest (percent)           50.00%     50.00%      
Income/(Loss) from Equity Investments           CAD 87,000,000 92,000,000 85,000,000        
Equity Investments           CAD 641,000,000 597,000,000          
Difference between the carrying value of the investment and the underlying equity in the net assets | $                 $ 115     116
U.S. Natural Gas Pipelines | Iroquois                        
Equity Investments                        
Ownership interest (percent)           50.00%     50.00% 0.66% 50.00%  
Income/(Loss) from Equity Investments           CAD 59,000,000 54,000,000 51,000,000        
Equity Investments           CAD 280,000,000 309,000,000          
Difference between the carrying value of the investment and the underlying equity in the net assets | $                 $ 41     48
U.S. Natural Gas Pipelines | Millennium                        
Equity Investments                        
Ownership interest (percent)           47.50%     47.50%      
Income/(Loss) from Equity Investments           CAD 66,000,000 33,000,000 0        
Equity Investments           CAD 291,000,000 295,000,000          
U.S. Natural Gas Pipelines | Pennant Midstream                        
Equity Investments                        
Ownership interest (percent)           47.00%     47.00%      
Income/(Loss) from Equity Investments           CAD 11,000,000 6,000,000 0        
Equity Investments           228,000,000 246,000,000          
U.S. Natural Gas Pipelines | Other                        
Equity Investments                        
Income/(Loss) from Equity Investments           17,000,000 29,000,000 26,000,000        
Equity Investments           CAD 92,000,000 93,000,000          
Mexico Natural Gas Pipelines | Sur de Texas                        
Equity Investments                        
Ownership interest (percent)           60.00%     60.00%      
Income/(Loss) from Equity Investments           CAD 66,000,000 (3,000,000) 0        
Equity Investments           399,000,000 255,000,000          
Mexico Natural Gas Pipelines | TransGas                        
Equity Investments                        
Income/(Loss) from Equity Investments           (12,000,000) 0 5,000,000        
Equity Investments           0 28,000,000          
Liquids Pipelines | Other                        
Equity Investments                        
Income/(Loss) from Equity Investments           (20,000,000) 0 0        
Equity Investments           CAD 20,000,000 39,000,000          
Liquids Pipelines | Grand Rapids                        
Equity Investments                        
Ownership interest (percent)           50.00%     50.00%      
Income/(Loss) from Equity Investments           CAD 17,000,000 (1,000,000) 0        
Equity Investments           996,000,000 876,000,000          
Liquids Pipelines | Canaport Energy East Marine Terminal Limited Partnership                        
Equity Investments                        
Equity Investments           0            
Energy | Other                        
Equity Investments                        
Income/(Loss) from Equity Investments           6,000,000 3,000,000 5,000,000        
Equity Investments           CAD 63,000,000 66,000,000          
Energy | Bruce Power                        
Equity Investments                        
Ownership interest (percent)           48.40%     48.40%      
Income/(Loss) from Equity Investments           CAD 434,000,000 293,000,000 249,000,000        
Equity Investments           2,987,000,000 3,356,000,000          
Difference between the carrying value of the investment and the underlying equity in the net assets           CAD 902,000,000 942,000,000          
Energy | Portlands Energy                        
Equity Investments                        
Ownership interest (percent)           50.00%     50.00%      
Income/(Loss) from Equity Investments           CAD 31,000,000 33,000,000 30,000,000        
Equity Investments           CAD 301,000,000 313,000,000          
Difference between the carrying value of the investment and the underlying equity in the net assets | $                 $ 73     $ 70
Energy | ASTC Power Partnership                        
Equity Investments                        
Ownership interest (percent)           50.00%     50.00%      
Income/(Loss) from Equity Investments           CAD 0 (37,000,000) CAD (23,000,000)        
Equity Investments           CAD 0 CAD 0          
Energy | Sundance B PPA                        
Equity Investments                        
Asset impairment charges         CAD 29,000,000              
Asset impairment charge, after tax         CAD 21,000,000              
Energy East, Eastern Mainline and Upland Projects | Liquids Pipelines                        
Equity Investments                        
Asset impairment charges   CAD 20,000,000