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VARIABLE INTEREST ENTITIES - CONSOLIDATED VARIABLE INTEREST ENTITIES (Narrative) (Details)
12 Months Ended
Aug. 01, 2018
Dec. 31, 2018
Dec. 31, 2017
EECI      
Schedule of Equity Method Investments [Line Items]      
Ownership interest in subsidiary (as a percent)   100.00%  
EIPLP | Alliance Pipeline      
Schedule of Equity Method Investments [Line Items]      
Ownership interest of equity method investment (as a percent)   50.00%  
Enbridge Management Services Inc.      
Schedule of Equity Method Investments [Line Items]      
Ownership interest in subsidiary (as a percent)   100.00%  
Enbridge Canadian Renewable LP (ECRLP) | Canada Pension Plan Investment Board (CPPIB)      
Schedule of Equity Method Investments [Line Items]      
Direct common interest (as a percent) 49.00%    
EEP      
Schedule of Equity Method Investments [Line Items]      
Economic interest (as a percent)   100.00% 34.60%
Enbridge Income Fund      
Schedule of Equity Method Investments [Line Items]      
Direct common interest (as a percent)     29.40%
Economic interest (as a percent)   100.00% 82.50%
EIPLP      
Schedule of Equity Method Investments [Line Items]      
Direct common interest (as a percent)     53.10%
Economic interest (as a percent)   100.00% 73.50%
DakTex      
Schedule of Equity Method Investments [Line Items]      
Ownership interest in subsidiary (as a percent)   75.00%  
DakTex | EEP      
Schedule of Equity Method Investments [Line Items]      
Ownership interest in subsidiary (as a percent)   25.00%  
Bakken Pipeline System      
Schedule of Equity Method Investments [Line Items]      
Ownership interest of equity method investment (as a percent)   27.60%  
Spectra Energy Partners, LP      
Schedule of Equity Method Investments [Line Items]      
Direct common interest (as a percent)   100.00% 75.00%
Other Limited Partnerships      
Schedule of Equity Method Investments [Line Items]      
Direct common interest (as a percent)   100.00%