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DEBT - Schedule of Long-Term Debt Repayments (Details) $ in Millions, $ in Millions | 1 Months Ended | 6 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2019 CAD ($) | Nov. 30, 2019 CAD ($) | Sep. 30, 2019 USD ($) | May 31, 2019 USD ($) | Mar. 31, 2019 USD ($) | Feb. 28, 2019 USD ($) | Feb. 28, 2019 CAD ($) | Jan. 31, 2019 CAD ($) | Dec. 31, 2018 CAD ($) | Nov. 30, 2018 CAD ($) | Oct. 31, 2018 USD ($) | Oct. 31, 2018 CAD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2018 CAD ($) | Aug. 31, 2018 CAD ($) | Jul. 31, 2018 USD ($) | Apr. 30, 2018 USD ($) | Apr. 30, 2018 CAD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2019 USD ($) | Nov. 30, 2019 CAD ($) | Dec. 31, 2018 USD ($) | Nov. 30, 2018 CAD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2018 CAD ($)
Enbridge Energy Partners, L.P. | 8.05% fixed/floating rate junior subordinated notes due 2067 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  | 8.05% | 8.05% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  |  |  | $ 400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Enbridge Energy Partners, L.P. | 5.20% senior notes due 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) | 5.20% | 5.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.20% | 5.20% |  |  |  | 5.20% | 5.20% |
Extinguishment of debt | $ 500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Consideration | $ 504 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Enbridge Energy Partners, L.P. | 4.38% senior notes due 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) | 4.38% | 4.38% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.38% | 4.38% |  |  |  | 4.38% | 4.38% |
Extinguishment of debt | $ 500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Consideration | $ 509 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Enbridge Energy Partners, L.P. | 9.88% senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  | 9.88% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  |  | $ 500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Enbridge Energy Partners, L.P. | 6.50% senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.50% | 6.50% |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 400 |  |  |  |  |  |  |  |  |  |
Enbridge Energy Partners, L.P. | 7.00% senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  | 7.00% | 7.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  | $ 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Enbridge Income Fund | 4.00% medium-term notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  | 4.00% |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% |  |  |  | 4.00%
Extinguishment of debt |  |  |  |  |  |  |  |  |  | $ 125 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Enbridge Pipelines (Southern Lights) L.L.C. | 3.98% senior notes due 2040 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) | 3.98% | 3.98% |  |  |  |  |  |  |  | 3.98% |  |  |  |  |  |  |  |  |  |  | 3.98% | 3.98% |  | 3.98% |  | 3.98% | 3.98% | 3.98%
Extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 49 |  | $ 43 |  |  |  |
Enbridge Pipelines Inc. | 4.49% medium-term notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  | 4.49% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.49% |  |  |  |  |
Extinguishment of debt |  |  | $ 200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Enbridge Pipelines Inc. | 4.49% medium-term notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  | 4.49% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.49% |  |  |  |  |
Extinguishment of debt |  |  | $ 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Enbridge Pipelines Inc. | 6.62% medium-term notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  | 6.62% |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.62% |  |  |
Extinguishment of debt |  |  |  |  |  |  |  |  |  |  | $ 170 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Enbridge Pipelines Inc. | 6.62% medium-term notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  | 6.62% |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.62% |  |  |
Extinguishment of debt |  |  |  |  |  |  |  |  |  |  | $ 130 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Enbridge Southern Lights LP | 4.01% senior notes due 2040 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) | 4.01% | 4.01% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.01% | 4.01% |  |  |  | 4.01% | 4.01% |
Extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 17 |  |  |  |  |  |  |
Enbridge Southern Lights LP | 4.01% senior notes due 2040 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  | 4.01% |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.01% |  |  |  | 4.01%
Extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 27
Midcoast Energy Partner L.P. | 3.56% senior notes due 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.56% |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 75 |  |  |  |  |  |  |  |  |  |  |
Cash Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 76 |  |  |  |  |  |  |  |  |  |  |
Midcoast Energy Partner L.P. | 4.04% senior notes due 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.04% |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 175 |  |  |  |  |  |  |  |  |  |  |
Cash Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 182 |  |  |  |  |  |  |  |  |  |  |
Midcoast Energy Partner L.P. | 4.42% senior notes due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.42% |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 150 |  |  |  |  |  |  |  |  |  |  |
Cash Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 161 |  |  |  |  |  |  |  |  |  |  |
Spectra Energy Capital, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50 | $ 64 |
Spectra Energy Capital, LLC | 6.75% senior unsecured notes due 2032 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.75% |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 64 |  |  |  |  |  |  |  |
Cash Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 80 |  |  |  |  |  |  |  |
Spectra Energy Capital, LLC | 7.50% senior unsecured notes due 2038 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.50% |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 43 |  |  |  |  |  |  |  |
Cash Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 59 |  |  |  |  |  |  |  |
Spectra Energy Capital, LLC | 5.65% senior unsecured notes due 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.65% |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 163 |  |  |  |  |  |  |  |
Cash Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 172 |  |  |  |  |  |  |  |
Spectra Energy Capital, LLC | 3.30% senior unsecured notes due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.30% |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 498 |  |  |  |  |  |  |  |
Cash Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 508 |  |  |  |  |  |  |  |
Spectra Energy Capital, LLC | 6.20% senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.20% | 6.20% |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 272 |  |  |  |  |  |  |  |  |  |
Spectra Energy Capital, LLC | 6.75% senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.75% |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 118 |  |  |  |  |  |  |  |  |  |  |
Spectra Energy Partners, LP | 2.95% senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.95% | 2.95% |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Union Gas Limited | 5.35% medium-term notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.35% | 5.35% |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200 |  |  |  |  |  |  |  |  |
Union Gas Limited | 8.75% debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.75% |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 125 |  |  |  |  |  |  |  |  |  |  |  |
Union Gas Limited | 8.65% senior debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  | 8.65% | 8.65% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  | $ 75 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Westcoast Energy Inc. | 5.60% medium-term notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  | 5.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  |  |  |  |  | $ 250 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Westcoast Energy Inc. | 5.60% medium-term notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  | 5.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  |  |  |  |  | $ 50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Westcoast Energy Inc. | 6.90% senior secured notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  | 6.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.90% |  |  |  |  |
Extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 26 |  |  |  |  |
Westcoast Energy Inc. | 4.34% senior secured notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  | 4.34% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.34% |  |  |  |  |
Extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5 |  |  |  |  |
Westcoast Energy Inc. | 1.00% senior secured notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |
Extinguishment of debt |  | $ 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Westcoast Energy Inc. | 6.90% senior secured notes due 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  | 6.90% |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.90% |  |  |
Extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 26 |  |  |
Westcoast Energy Inc. | 4.34% senior secured notes due 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  | 4.34% |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.34% |  |  |
Extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9 |  |  |
Westcoast Energy Inc. | 8.50% debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.50% | 8.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 150 |  |  |  |  |  |  |  |  |  |  |  |  |
Enbridge Inc. | 4.10% medium-term notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  | 4.10% | 4.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  |  |  |  | $ 300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Enbridge Inc. | Floating rate notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  | 4.77% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  | $ 400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Enbridge Inc. | 5.60% medium-term notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  | $ 750 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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