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DEBT - Long Term Debt Repayments (Details) $ in Millions, $ in Millions | 1 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2021 CAD ($) | May 31, 2021 CAD ($) | Mar. 31, 2021 USD ($) | Mar. 31, 2021 CAD ($) | Feb. 28, 2021 CAD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2021 CAD ($)
DEBT |  |  |  |  |  |  |  |
Principal Amount |  |  |  |  |  |  | $ 880 | $ 808
Enbridge Energy Partners, L.P. | 4.20% senior notes |  |  |  |  |  |  |  |
DEBT |  |  |  |  |  |  |  |
Interest rate (as a percent) | 4.20% | 4.20% |  |  |  |  |  |
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% |  |  |  |  |  |
Principal Amount | $ 30 |  |  |  |  |  |  |
Enbridge Southern Lights LP [Member] | 4.01% senior notes |  |  |  |  |  |  |  |
DEBT |  |  |  |  |  |  |  |
Interest rate (as a percent) | 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 |  |  |

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