DEBT - Long Term Debt Repayments (Details) $ in Millions, $ in Millions	1 Months Ended						6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2021 CAD ($)	May 31, 2021 CAD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2021 CAD ($)	Feb. 28, 2021 CAD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2021 CAD ($)
DEBT
Principal Amount							$ 880	$ 808
Enbridge Energy Partners, L.P. | 4.20% senior notes
DEBT
Interest rate (as a percent)	4.20%	4.20%					4.20%	4.20%
Principal Amount	$ 600
Enbridge Gas Inc. | 2.76% medium-term notes
DEBT
Interest rate (as a percent)			2.76%
Principal Amount			$ 200
Enbridge Pipelines (Southern Lights) LLC [Member] | 3.98% senior notes
DEBT
Interest rate (as a percent)	3.98%	3.98%					3.98%	3.98%
Principal Amount	$ 30
Enbridge Southern Lights LP [Member] | 4.01% senior notes
DEBT
Interest rate (as a percent)	4.01%	4.01%					4.01%	4.01%
Principal Amount		$ 8
Spectra Energy Partners, LP | 4.60% senior notes
DEBT
Interest rate (as a percent)				4.60%	4.60%
Principal Amount				$ 250
Enbridge Inc. | 4.26% medium-term notes
DEBT
Interest rate (as a percent)						4.26%
Principal Amount						$ 200
Enbridge Inc. | 3.16% medium-term notes
DEBT
Interest rate (as a percent)				3.16%	3.16%
Principal Amount					$ 400