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DEBT - Schedule of Long-Term Debt Repayments (Details) $ in Millions, $ in Millions | 1 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 30, 2020 CAD ($) | Oct. 31, 2020 USD ($) | Jul. 31, 2020 CAD ($) | Jun. 30, 2020 USD ($) | Apr. 30, 2020 CAD ($) | Mar. 31, 2020 CAD ($) | Jan. 31, 2020 USD ($) | Jan. 31, 2020 CAD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CAD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  |  |  |  |  |  |  | $ 2,100 | $ 1,700
Enbridge Gas Inc. | 4.04% medium-term notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) | 4.04% |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt | $ 400 |  |  |  |  |  |  |  |  |  |  |
Enbridge Pipelines (Southern Lights) L.L.C. | 3.98% senior notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  | 3.98% | 3.98% | 3.98% | 3.98%
Extinguishment of debt |  |  |  |  |  |  |  |  | $ 56 |  |  |
Enbridge Pipelines Inc. | 4.45% medium-term notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  | 4.45% |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  | $ 350 |  |  |  |  |  |  |
Enbridge Southern Lights LP | 4.01% senior notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  | 4.01% | 4.01% | 4.01% | 4.01%
Extinguishment of debt |  |  |  |  |  |  |  |  |  | $ 15 |  |
Spectra Energy Partners, LP | 6.09% senior secured notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  | 6.09% | 6.09% |  |  |  |
Extinguishment of debt |  |  |  |  |  |  | $ 111 |  |  |  |  |
Spectra Energy Partners, LP | Floating rate notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  | $ 400 |  |  |  |  |  |  |  |
Spectra Energy Partners, LP | 4.13% senior notes due 2020 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  | 4.13% |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  | $ 300 |  |  |  |  |  |  |  |  |  |
Westcoast Energy Inc. | 9.90% debentures |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  | 9.90% | 9.90% |  |  |  |
Extinguishment of debt |  |  |  |  |  |  |  | $ 100 |  |  |  |
Westcoast Energy Inc. | 4.57% medium-term notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  | 4.57% |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  | $ 250 |  |  |  |  |  |  |  |  |
Enbridge Inc. | Floating rate notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  |  |  | $ 700 |  |  |  |  |
Enbridge Inc. | 4.53% medium-term notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  | 4.53% |  |  |  |  |  |
Extinguishment of debt |  |  |  |  |  | $ 500 |  |  |  |  |  |
Enbridge Inc. | Floating rate notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  | $ 500 |  |  |  |  |  |  |  |
Enbridge Inc. | 4.85% medium-term notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) | 4.85% |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt | $ 100 |  |  |  |  |  |  |  |  |  |  |

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