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DEBT - Schedule of Long-term Debt Issuances (Details) | 1 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 31, 2020 USD ($) | Feb. 29, 2020 USD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 USD ($) | Oct. 31, 2020 USD ($) | May 31, 2020 CAD ($) | Apr. 30, 2020 CAD ($) | Aug. 31, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount |  |  | $ 2,500,000,000 | $ 2,100,000,000 |  |  |  |
Enbridge Gas Inc. | 2.90% medium-term notes due April 2030 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Fixed interest rate (as a percent) |  |  |  |  |  |  | 2.90% |
Principal amount |  |  |  |  |  |  | $ 600,000,000 |
Enbridge Gas Inc. | 3.65% medium-term notes due April 2050 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Fixed interest rate (as a percent) |  |  |  |  |  |  | 3.65% |
Principal amount |  |  |  |  |  |  | $ 600,000,000 |
Spectra Energy Partners, LP | 3.10% senior notes due October 2040 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Fixed interest rate (as a percent) |  |  |  |  |  |  |  | 3.10%
Principal amount |  |  |  |  | $ 300,000,000 |  |  |
Enbridge Inc. | Floating rate notes due February 2022 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount |  | $ 750,000,000 |  |  |  |  |  |
Enbridge Inc. | Floating rate notes due February 2022 | LIBOR |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  | 0.50% |  |  |  |  |  |
Enbridge Inc. | 3.20% medium-term notes due June 2027 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Fixed interest rate (as a percent) |  |  |  |  |  | 3.20% |  |
Principal amount |  |  |  |  |  | $ 750,000,000 |  |
Enbridge Inc. | 2.44% medium-term notes due June 2025 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Fixed interest rate (as a percent) |  |  |  |  |  | 2.44% |  |
Principal amount |  |  |  |  |  | $ 550,000,000 |  |
Enbridge Inc. | Fixed-to-fixed subordinated term notes due July 2080 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Fixed interest rate (as a percent) | 5.75% |  |  |  |  |  |  |
Principal amount | $ 1,000,000,000 |  |  |  |  |  |  |
Term of debt instrument | 60 years |  |  |  |  |  |  |
Term of fixed rate | 10 years |  |  |  |  |  |  |
Enbridge Inc. | Fixed-to-fixed subordinated term notes due July 2080 | US Treasury Rate | From years 10 to 30 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 5.31% |  |  |  |  |  |  |
Enbridge Inc. | Fixed-to-fixed subordinated term notes due July 2080 | US Treasury Rate | From years 30 to 60 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 6.06% |  |  |  |  |  |  |

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