DEBT - Long Term Debt Issuance (Details)	Aug. 31, 2019 CAD ($)	Aug. 31, 2019 USD ($)	Feb. 28, 2019 CAD ($)
3.24% senior notes due August 2029 | Algonquin Gas Transmission, LLC
Debt Instrument [Line Items]
Principal Amount		$ 500,000,000
Interest rate (as a percent)	3.24%	3.24%
2.37% medium-term notes due August 2029 | Enbridge Gas Inc.
Debt Instrument [Line Items]
Principal Amount	$ 400,000,000
Interest rate (as a percent)	2.37%	2.37%
3.01% medium-term notes due August 2049 | Enbridge Gas Inc.
Debt Instrument [Line Items]
Principal Amount	$ 300,000,000
Interest rate (as a percent)	3.01%	3.01%
3.52% medium-term notes due February 2029 | Enbridge Pipelines Inc.
Debt Instrument [Line Items]
Principal Amount			$ 600,000,000
Interest rate (as a percent)			3.52%
4.33% medium-term notes due February 2049 | Enbridge Pipelines Inc.
Debt Instrument [Line Items]
Principal Amount			$ 600,000,000
Interest rate (as a percent)			4.33%