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LONG-TERM INVESTMENTS (Details)
£ in Millions, shares in Millions, CAD in Millions
1 Months Ended 12 Months Ended
Nov. 30, 2015
GBP (£)
Nov. 30, 2015
GBP (£)
item
Nov. 30, 2015
GBP (£)
mi
Nov. 30, 2015
GBP (£)
km
Nov. 30, 2015
GBP (£)
MW
Nov. 30, 2014
CAD
Dec. 31, 2015
CAD
Dec. 31, 2014
CAD
shares
Dec. 31, 2013
CAD
shares
Dec. 31, 2015
GBP (£)
Dec. 31, 2015
CAD
Nov. 30, 2015
CAD
Nov. 04, 2015
Jul. 01, 2014
LONG TERM INVESTMENTS                            
Long term investments               CAD 5,408     CAD 7,008      
Goodwill               742     885      
Amortizable assets               494     568      
Dividends received             CAD 719 564 CAD 685          
Income statement of unconsolidated equity investments                            
Revenues             1,557 1,790 1,212          
Commodity costs             (369) (661) (371)          
Operating and administrative expense             (376) (444) (266)          
Depreciation and amortization             (274) (232) (175)          
Other income/(expense)             4 (1) 4          
Interest expense             (67) (84) (74)          
Earnings before income taxes             475 368 CAD 330          
Balance sheet of unconsolidated equity investments                            
Current assets               472     389      
Property, plant and equipment, net               5,214     6,602      
Deferred amounts and other assets               34     40      
Intangible assets, net               77     64      
Goodwill               742     885      
Current liabilities               (712)     (500)      
Long-term debt               (811)     (854)      
Other long-term liabilities               (85)     (167)      
Net assets               4,931     CAD 6,459      
Gas Pipelines, Processing and Energy Services                            
LONG TERM INVESTMENTS                            
Long term assets reclassified           CAD (203)                
Sponsored Investments                            
LONG TERM INVESTMENTS                            
Long term assets reclassified           CAD 203                
Preference shares | Minimum                            
LONG TERM INVESTMENTS                            
Cumulative dividends based on average yield of Government of Canada bonds, spread over reference rate (as a percent)                   4.30% 4.30%      
Preference shares | Maximum                            
LONG TERM INVESTMENTS                            
Cumulative dividends based on average yield of Government of Canada bonds, spread over reference rate (as a percent)                   4.40% 4.40%      
Other | Corporate                            
LONG TERM INVESTMENTS                            
Other Long-Term Investments               102     CAD 120      
Southern Access Extension Project                            
LONG TERM INVESTMENTS                            
Ownership Interest (as a percent)                           65.00%
Balance sheet of unconsolidated equity investments                            
Ownership percent sold                           35.00%
Southern Access Extension Project | Liquids Pipelines                            
LONG TERM INVESTMENTS                            
Ownership Interest (as a percent)                   65.00% 65.00%      
Equity Investments               263     CAD 713      
Seaway Pipeline | Liquids Pipelines                            
LONG TERM INVESTMENTS                            
Ownership Interest (as a percent)                   50.00% 50.00%      
Equity Investments               2,782     CAD 3,251      
Offshore - various joint ventures | Gas Pipelines, Processing and Energy Services                            
LONG TERM INVESTMENTS                            
Equity Investments               429     CAD 479      
Offshore - various joint ventures | Gas Pipelines, Processing and Energy Services | Minimum                            
LONG TERM INVESTMENTS                            
Ownership Interest (as a percent)                   22.00% 22.00%      
Offshore - various joint ventures | Gas Pipelines, Processing and Energy Services | Maximum                            
LONG TERM INVESTMENTS                            
Ownership Interest (as a percent)                   74.30% 74.30%      
Rampion Offshore Wind Limited                            
LONG TERM INVESTMENTS                            
Ownership Interest (as a percent) 24.90% 24.90% 24.90% 24.90% 24.90%             24.90% 24.90%  
Balance sheet of unconsolidated equity investments                            
Wind project capacity | MW         400                  
Distance off the shore from the UK Sussex coast     8 13                    
Estimated aggregate amount of investment £ 370.0 £ 370.0 £ 370.0 £ 370.0 £ 370.0             CAD 750    
Amount of investment                   £ 96.9 CAD 201      
Power purchase agreement period 15 years                          
Total number of investors | item   3                        
Rampion Offshore Wind Limited | UK Green Investment Bank plc                            
LONG TERM INVESTMENTS                            
Ownership Interest (as a percent) 25.00% 25.00% 25.00% 25.00% 25.00%             25.00%    
Rampion Offshore Wind Limited | E.ON Climate And Renewables UK Limited                            
LONG TERM INVESTMENTS                            
Ownership Interest (as a percent) 50.10% 50.10% 50.10% 50.10% 50.10%             50.10%    
Rampion Offshore Wind Limited | Gas Pipelines, Processing and Energy Services                            
LONG TERM INVESTMENTS                            
Ownership Interest (as a percent)                   24.90% 24.90%      
Equity Investments                     CAD 201      
Vector Pipeline | Gas Pipelines, Processing and Energy Services                            
LONG TERM INVESTMENTS                            
Ownership Interest (as a percent)                   60.00% 60.00%      
Equity Investments               141     CAD 159      
Aux Sable | Gas Pipelines, Processing and Energy Services                            
LONG TERM INVESTMENTS                            
Equity Investments               311     CAD 344      
Aux Sable | Gas Pipelines, Processing and Energy Services | Minimum                            
LONG TERM INVESTMENTS                            
Ownership Interest (as a percent)                   42.70% 42.70%      
Aux Sable | Gas Pipelines, Processing and Energy Services | Maximum                            
LONG TERM INVESTMENTS                            
Ownership Interest (as a percent)                   50.00% 50.00%      
Alliance Pipeline Canada And US | Sponsored Investments                            
LONG TERM INVESTMENTS                            
Ownership Interest (as a percent)                   50.00% 50.00%      
Equity Investments               374     CAD 436      
Texas Express Pipeline | Sponsored Investments                            
LONG TERM INVESTMENTS                            
Ownership Interest (as a percent)                   35.00% 35.00%      
Equity Investments               442     CAD 515      
Enbridge Rail (Philadelphia) L.L.C. | Corporate                            
LONG TERM INVESTMENTS                            
Ownership Interest (as a percent)                   75.00% 75.00%      
Equity Investments                     CAD 142      
Enbridge Insurance (Barbados Oil) Limited | Corporate                            
LONG TERM INVESTMENTS                            
Other Long-Term Investments               23     35      
Enbridge (U.S.) Inc. | Corporate                            
LONG TERM INVESTMENTS                            
Other Long-Term Investments               29     35      
Other Equity Investments | Liquids Pipelines                            
LONG TERM INVESTMENTS                            
Equity Investments               65     CAD 95      
Other Equity Investments | Liquids Pipelines | Minimum                            
LONG TERM INVESTMENTS                            
Ownership Interest (as a percent)                   30.00% 30.00%      
Other Equity Investments | Liquids Pipelines | Maximum                            
LONG TERM INVESTMENTS                            
Ownership Interest (as a percent)                   75.00% 75.00%      
Other Equity Investments | Gas Pipelines, Processing and Energy Services                            
LONG TERM INVESTMENTS                            
Equity Investments               12     CAD 13      
Other Equity Investments | Gas Pipelines, Processing and Energy Services | Minimum                            
LONG TERM INVESTMENTS                            
Ownership Interest (as a percent)                   33.30% 33.30%      
Other Equity Investments | Gas Pipelines, Processing and Energy Services | Maximum                            
LONG TERM INVESTMENTS                            
Ownership Interest (as a percent)                   70.00% 70.00%      
Other Equity Investments | Sponsored Investments                            
LONG TERM INVESTMENTS                            
Ownership Interest (as a percent)                   50.00% 50.00%      
Equity Investments               67     CAD 54      
Other Equity Investments | Corporate                            
LONG TERM INVESTMENTS                            
Equity Investments               CAD 45     CAD 57      
Other Equity Investments | Corporate | Minimum                            
LONG TERM INVESTMENTS                            
Ownership Interest (as a percent)                   19.00% 19.00%      
Other Equity Investments | Corporate | Maximum                            
LONG TERM INVESTMENTS                            
Ownership Interest (as a percent)                   49.99% 49.99%      
Noverco | Common shares                            
LONG TERM INVESTMENTS                            
Ownership Interest (as a percent)               38.90%   38.90% 38.90%      
Balance sheet of unconsolidated equity investments                            
Ownership interest (as a percent)               3.60% 3.90% 3.60% 3.60%      
Number of shares sold through secondary offering | shares               1.3 15.0          
Indirect pro-rata interest of the entity in the shares of the entity (as a percent)               1.40% 1.50% 1.40% 1.40%      
Amount reduced from equity investment and shareholder's equity by the reciprocal shareholding             CAD 83 CAD 83 CAD 86          
Noverco | Common shares | Corporate                            
LONG TERM INVESTMENTS                            
Ownership Interest (as a percent)                   38.90% 38.90%      
Noverco | Preference shares                            
Balance sheet of unconsolidated equity investments                            
Cumulative dividends per share calculation, maturity period of Government of Canada bond             10 years              
Noverco | Preference shares | Minimum                            
LONG TERM INVESTMENTS                            
Cumulative dividends based on average yield of Government of Canada bonds, spread over reference rate (as a percent)                   4.30% 4.30%      
Noverco | Preference shares | Maximum                            
LONG TERM INVESTMENTS                            
Cumulative dividends based on average yield of Government of Canada bonds, spread over reference rate (as a percent)                   4.40% 4.40%      
Noverco | Preference shares | Corporate                            
LONG TERM INVESTMENTS                            
Other Long-Term Investments               CAD 323     CAD 359