DEBT - Long Term Debt Repayments (Details) $ in Millions, $ in Millions	1 Months Ended							9 Months Ended
	Jul. 31, 2020 CAD ($)	Jun. 30, 2020 CAD ($)	Jun. 30, 2020 USD ($)	Apr. 30, 2020 CAD ($)	Mar. 31, 2020 CAD ($)	Jan. 31, 2020 CAD ($)	Jan. 31, 2020 USD ($)	Sep. 30, 2020 CAD ($)	Sep. 30, 2020 USD ($)
DEBT
Principal Amount								$ 1,200	$ 1,700
Enbridge Pipelines (Southern Lights) L.L.C. | 3.98% senior notes
DEBT
Principal Amount			$ 26
Interest rate (as a percent)		3.98%	3.98%
Enbridge Pipelines Inc. | 4.45% medium-term notes
DEBT
Principal Amount				$ 350
Interest rate (as a percent)				4.45%
Enbridge Southern Lights LP | 4.01% senior notes
DEBT
Principal Amount		$ 7
Interest rate (as a percent)		4.01%	4.01%
Spectra Energy Partners, LP | 6.09% senior secured notes
DEBT
Principal Amount							$ 111
Interest rate (as a percent)						6.09%	6.09%
Spectra Energy Partners, LP | Floating rate notes
DEBT
Principal Amount			$ 400
Westcoast Energy Inc. | 9.90% debentures
DEBT
Principal Amount						$ 100
Interest rate (as a percent)						9.90%	9.90%
Westcoast Energy Inc. | 4.57% medium-term notes
DEBT
Principal Amount	$ 250
Interest rate (as a percent)	4.57%
Enbridge Inc. | Floating rate notes
DEBT
Principal Amount							$ 700
Enbridge Inc. | 4.53% medium-term notes
DEBT
Principal Amount					$ 500
Interest rate (as a percent)					4.53%
Enbridge Inc. | Floating rate notes
DEBT
Principal Amount			$ 500