DEBT - Schedule of Long-Term Debt Repayments (Details) $ in Millions, $ in Millions	1 Months Ended								7 Months Ended		12 Months Ended
	Nov. 30, 2020 CAD ($)	Oct. 31, 2020 USD ($)	Jul. 31, 2020 CAD ($)	Jun. 30, 2020 USD ($)	Apr. 30, 2020 CAD ($)	Mar. 31, 2020 CAD ($)	Jan. 31, 2020 USD ($)	Jan. 31, 2020 CAD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 CAD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 CAD ($)
Debt Instrument [Line Items]
Extinguishment of debt											$ 2,100	$ 1,700
Enbridge Gas Inc. | 4.04% medium-term notes
Debt Instrument [Line Items]
Interest rate (percent)	4.04%
Extinguishment of debt	$ 400
Enbridge Pipelines (Southern Lights) L.L.C. | 3.98% senior notes
Debt Instrument [Line Items]
Interest rate (percent)									3.98%	3.98%	3.98%	3.98%
Extinguishment of debt									$ 56
Enbridge Pipelines Inc. | 4.45% medium-term notes
Debt Instrument [Line Items]
Interest rate (percent)					4.45%
Extinguishment of debt					$ 350
Enbridge Southern Lights LP | 4.01% senior notes
Debt Instrument [Line Items]
Interest rate (percent)									4.01%	4.01%	4.01%	4.01%
Extinguishment of debt										$ 15
Spectra Energy Partners, LP | 6.09% senior secured notes
Debt Instrument [Line Items]
Interest rate (percent)							6.09%	6.09%
Extinguishment of debt							$ 111
Spectra Energy Partners, LP | Floating rate notes
Debt Instrument [Line Items]
Extinguishment of debt				$ 400
Spectra Energy Partners, LP | 4.13% senior notes due 2020
Debt Instrument [Line Items]
Interest rate (percent)		4.13%
Extinguishment of debt		$ 300
Westcoast Energy Inc. | 9.90% debentures
Debt Instrument [Line Items]
Interest rate (percent)							9.90%	9.90%
Extinguishment of debt								$ 100
Westcoast Energy Inc. | 4.57% medium-term notes
Debt Instrument [Line Items]
Interest rate (percent)			4.57%
Extinguishment of debt			$ 250
Enbridge Inc. | Floating rate notes
Debt Instrument [Line Items]
Extinguishment of debt							$ 700
Enbridge Inc. | 4.53% medium-term notes
Debt Instrument [Line Items]
Interest rate (percent)						4.53%
Extinguishment of debt						$ 500
Enbridge Inc. | Floating rate notes
Debt Instrument [Line Items]
Extinguishment of debt				$ 500
Enbridge Inc. | 4.85% medium-term notes
Debt Instrument [Line Items]
Interest rate (percent)	4.85%
Extinguishment of debt	$ 100