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DEBT - Long Term Debt Issuance (Details) | Aug. 31, 2019 CAD ($) | Aug. 31, 2019 USD ($) | Feb. 28, 2019 CAD ($)
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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%

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