DEBT - Long Term Debt Repayments (Details) $ in Millions, $ in Millions	1 Months Ended
	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 To Floating Rate Junior Subordinated Notes Due 2067
DEBT
Extinguishment of debt					$ 400
Interest rate (as a percent)				8.05%	8.05%
Enbridge Energy Partners, L.P. | 9.88% Senior Notes
DEBT
Extinguishment of debt			$ 500
Interest rate (as a percent)	9.88%
Enbridge Pipelines (Southern Lights) LLC | 3.98% Medium Term Notes Due 2040
DEBT
Extinguishment of debt	$ 23
Interest rate (as a percent)	3.98%
Westcoast Energy Inc | 5.60% Medium-Term Notes
DEBT
Extinguishment of debt						$ 250
Interest rate (as a percent)						5.60%
Westcoast Energy Inc | 5.60% Medium-term Notes
DEBT
Extinguishment of debt						$ 50
Interest rate (as a percent)						5.60%
Westcoast Energy Inc | 6.90% Senior Secured Notes Due 2019
DEBT
Extinguishment of debt		$ 13
Interest rate (as a percent)		6.90%
Westcoast Energy Inc | 4.34% Senior Secured Notes Due 2019
DEBT
Extinguishment of debt		$ 2
Interest rate (as a percent)		4.34%
Enbridge Inc. | 4.10% Medium-Term Notes Due February 2019
DEBT
Extinguishment of debt				$ 300
Interest rate (as a percent)				4.10%	4.10%
Enbridge Inc. | Floating Rate Notes Due May 2019
DEBT
Extinguishment of debt		$ 750