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DEBT - Narrative (Details) $ in Thousands, $ in Millions |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 04, 2021 USD ($) Tranche | Jul. 23, 2021 CAD ($) | Feb. 25, 2021 USD ($) debt_instrument | Feb. 10, 2021 CAD ($) | Feb. 28, 2021 USD ($) | Sep. 30, 2021 CAD ($) | Sep. 30, 2020 CAD ($) | Sep. 30, 2021 CAD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 CAD ($) | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2020 CAD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount |  |  |  |  |  |  |  | $ 808,000 | $ 880 |  |  |  |
Commitment fee percentage |  |  |  |  |  |  |  | 0.10% | 0.10% |  |  |  |
Long-term debt |  |  |  |  |  | $ 65,036,000 |  | $ 65,036,000 |  |  |  |  | $ 62,819,000
Principal amount of debt |  |  |  |  |  | 3,200,000 |  | 3,200,000 |  |  | $ 2,400 |  |
Long-term debt, fair value adjustment |  |  |  |  |  | 687,000 |  | 687,000 |  |  |  |  | 750,000
Amortization of fair value adjustment |  |  |  |  |  | 11,000 | $ 13,000 | 36,000 |  | $ 42,000 |  |  |
Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of term loans repaid | debt_instrument |  |  | 2 |  |  |  |  |  |  |  |  |  |
Principal Amount |  |  | $ 500 |  |  |  |  |  |  |  |  |  |
Subsequent event | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt | $ 1,500 |  |  |  |  |  |  |  |  |  |  |  |
Number of tranches | Tranche | 3 |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper and credit facility draws |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | 8,300,000 |  | 8,300,000 |  |  |  |  | 9,900,000
Fixed-to-floating subordinated term notes | Subordinated term notes |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Subordinated debt |  |  |  |  |  | 7,700,000 |  | 7,700,000 |  |  |  |  |
Fixed-to-fixed subordinated term notes | Subordinated term notes |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Subordinated debt |  |  |  |  |  |  |  |  |  |  |  |  | 7,800,000
Floating rate notes due February 2023 | Enbridge Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Term of debt instrument |  |  |  |  | 2 years |  |  |  |  |  |  |  |
Principal amount of debt |  |  |  |  | $ 500 |  |  |  |  |  |  |  |
Floating rate notes due February 2023 | SOFR | Enbridge Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Spread on variable rate (percent) |  |  |  |  | 0.40% |  |  |  |  |  |  |  |
0.55% 2-Year Senior Notes | Subsequent event | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Term of debt instrument | 2 years |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt | $ 500 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 0.55% |  |  |  |  |  |  |  |  |  |  |  |
1.60% 5-Year Senior Notes | Subsequent event | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Term of debt instrument | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt | $ 500 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 1.60% |  |  |  |  |  |  |  |  |  |  |  |
3.40% senior notes due August 2051 | Enbridge Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt |  |  |  |  |  |  |  |  |  |  |  | $ 500 |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 3.40% |
3.40% senior notes due August 2051 | Subsequent event | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt | $ 500 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 3.40% |  |  |  |  |  |  |  |  |  |  |  |
Committed credit facilities |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of credit facility |  |  |  |  |  | 21,137,000 |  | 21,137,000 |  |  |  |  |
Unutilized amount of facility |  |  |  |  |  | 9,570,000 |  | $ 9,570,000 |  |  |  |  |
Committed credit facilities | Enbridge Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Term out provision |  |  |  |  |  |  |  | 1 year | 1 year |  |  |  |
Amount of credit facility |  |  |  |  |  | 9,169,000 |  | $ 9,169,000 |  |  |  |  |
Unutilized amount of facility |  |  |  |  |  | 1,791,000 |  | $ 1,791,000 |  |  |  |  |
Committed credit facilities | Enbridge Pipelines Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Term out provision |  |  |  |  |  |  |  | 1 year | 1 year |  |  |  |
Amount of credit facility |  |  |  |  |  | 3,000,000 |  | $ 3,000,000 |  |  |  |  |
Unutilized amount of facility |  |  |  |  |  | 2,531,000 |  | $ 2,531,000 |  |  |  |  |
Committed credit facilities | Enbridge Gas Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Term out provision |  |  |  |  |  |  |  | 1 year | 1 year |  |  |  |
Amount of credit facility |  |  |  |  |  | 2,000,000 |  | $ 2,000,000 |  |  |  |  |
Unutilized amount of facility |  |  |  |  |  | 795,000 |  | $ 795,000 |  |  |  |  |
Committed credit facilities | Enbridge (U.S.) Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Term out provision |  |  |  |  |  |  |  | 1 year | 1 year |  |  |  |
Amount of credit facility |  |  |  |  |  | 6,968,000 |  | $ 6,968,000 |  |  |  |  |
Unutilized amount of facility |  |  |  |  |  | 4,453,000 |  | 4,453,000 |  |  |  |  |
Revolving credit facility | Sustainability-linked Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Term of debt instrument |  |  |  | 3 years |  |  |  |  |  |  |  |  |
Amount of credit facility |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |
Revolving credit facility | Syndicated Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Term of debt instrument |  |  |  | 1 year |  |  |  |  |  |  |  |  |
Credit facility terminated |  |  |  | $ 3,000,000 |  |  |  |  |  |  |  |  |
Revolving credit facility | 364-Day Extendible Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Term out provision |  | 1 year |  |  |  |  |  |  |  |  |  |  |
Term of debt instrument |  | 364 days |  |  |  |  |  |  |  |  |  |  |
Amount of credit facility |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility | Five-Year Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Term of debt instrument |  | 5 years |  |  |  |  |  |  |  |  |  |  |
Amount of credit facility |  | $ 8,000,000 |  |  |  |  |  |  |  |  |  |  |
Uncommitted demand credit facilities |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of credit facility |  |  |  |  |  | 1,300,000 |  | 1,300,000 |  |  |  |  | 849,000
Unutilized amount of facility |  |  |  |  |  | $ 868,000 |  | $ 868,000 |  |  |  |  | $ 533,000

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