DEBT - Long Term Debt Repayments (Details) $ in Millions, $ in Millions	1 Months Ended
	Sep. 30, 2019 CAD ($)	Jul. 31, 2019 CAD ($)	Jun. 30, 2019 USD ($)	May 31, 2019 CAD ($)	Mar. 31, 2019 USD ($)	Feb. 28, 2019 CAD ($)	Feb. 28, 2019 USD ($)	Jan. 31, 2019 CAD ($)
Enbridge Energy Partners, L.P. | 8.05% fixed/floating rate junior subordinated notes due 2067
DEBT
Principal Amount							$ 400
Interest rate (as a percent)						8.05%	8.05%
Enbridge Energy Partners, L.P. | 9.88% senior notes
DEBT
Principal Amount					$ 500
Interest rate (as a percent)					9.88%
Enbridge Pipelines (Southern Lights) L.L.C. | 3.98% medium-term notes due 2040
DEBT
Principal Amount			$ 23
Interest rate (as a percent)			3.98%
Enbridge Southern Lights LP | 4.01% senior notes due 2040
DEBT
Principal Amount		$ 10
Interest rate (as a percent)		4.01%
Westcoast Energy Inc. | 5.60% medium-term notes
DEBT
Principal Amount								$ 250
Interest rate (as a percent)								5.60%
Westcoast Energy Inc. | 5.60% medium-term notes
DEBT
Principal Amount								$ 50
Interest rate (as a percent)								5.60%
Westcoast Energy Inc. | 6.90% senior secured notes due 2019
DEBT
Principal Amount				$ 13
Interest rate (as a percent)				6.90%
Westcoast Energy Inc. | 4.34% senior secured notes due 2019
DEBT
Principal Amount				$ 2
Interest rate (as a percent)				4.34%
Enbridge Inc. | 4.10% medium-term notes
DEBT
Principal Amount						$ 300
Interest rate (as a percent)						4.10%	4.10%
Enbridge Inc. | Floating rate notes
DEBT
Principal Amount				$ 750
Enbridge Inc. | 4.77% medium-term notes
DEBT
Principal Amount	$ 400
Interest rate (as a percent)	4.77%