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DEBT - Narrative (Details) $ in Millions, $ in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 23, 2021 CAD ($) | Feb. 25, 2021 USD ($) debt_instrument | Feb. 10, 2021 CAD ($) | Feb. 28, 2021 USD ($) | Jun. 30, 2021 CAD ($) | Jun. 30, 2020 CAD ($) | Jun. 30, 2021 CAD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 CAD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2020 CAD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal Amount |  |  |  |  |  |  | $ 808 | $ 880 |  |  |
Commitment fee percentage |  |  |  |  |  |  | 0.20% | 0.20% |  |  |
Long-term debt |  |  |  |  | $ 63,090 |  | $ 63,090 |  |  |  | $ 62,819
Principal amount of debt |  |  |  |  | 800 |  | 800 |  |  | $ 2,000 |
Long-term debt, fair value adjustment |  |  |  |  | 703 |  | 703 |  |  |  | 750
Amortization of fair value adjustment |  |  |  |  | 13 | $ 14 | 25 |  | $ 29 |  |
Term Loan |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of term loans repaid | debt_instrument |  | 2 |  |  |  |  |  |  |  |  |
Principal Amount |  | $ 500 |  |  |  |  |  |  |  |  |
Commercial paper and credit facility draws |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  | 9,000 |  | 9,000 |  |  |  | 9,900
Fixed-to-floating subordinated term notes | Subordinated term notes |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Subordinated debt |  |  |  |  | 7,600 |  | 7,600 |  |  |  |
Fixed-to-fixed subordinated term notes | Subordinated term notes |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Subordinated debt |  |  |  |  |  |  |  |  |  |  | 7,800
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% |  |  |  |  |  |  |
Committed credit facilities |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount of credit facility |  |  |  |  | 20,936 |  | 20,936 |  |  |  |
Unutilized amount of facility |  |  |  |  | 8,510 |  | $ 8,510 |  |  |  |
Committed credit facilities | Enbridge Inc. |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Term out provision |  |  |  |  |  |  | 1 year | 1 year |  |  |
Amount of credit facility |  |  |  |  | 9,125 |  | $ 9,125 |  |  |  |
Unutilized amount of facility |  |  |  |  | 1,679 |  | $ 1,679 |  |  |  |
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 |  | $ 3,000 |  |  |  |
Unutilized amount of facility |  |  |  |  | 2,506 |  | $ 2,506 |  |  |  |
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 |  | $ 2,000 |  |  |  |
Unutilized amount of facility |  |  |  |  | 590 |  | $ 590 |  |  |  |
Committed credit facilities | Enbridge (U.S.) Inc. |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Term out provision |  |  |  |  |  |  | 1 year | 1 year |  |  |
Amount of credit facility |  |  |  |  | 6,811 |  | $ 6,811 |  |  |  |
Unutilized amount of facility |  |  |  |  | 3,735 |  | 3,735 |  |  |  |
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 |  |  |  |  |  |  |  |
Revolving credit facility | Syndicated Credit Facility |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Term of debt instrument |  |  | 1 year |  |  |  |  |  |  |  |
Credit facility terminated |  |  | $ 3,000 |  |  |  |  |  |  |  |
Revolving credit facility | 364-Day Extendible Credit Facilities | Subsequent event |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Term out provision | 1 year |  |  |  |  |  |  |  |  |  |
Term of debt instrument | 364 days |  |  |  |  |  |  |  |  |  |
Amount of credit facility | $ 10,000 |  |  |  |  |  |  |  |  |  |
Revolving credit facility | Five-Year Credit Facilities | Subsequent event |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Term of debt instrument | 5 years |  |  |  |  |  |  |  |  |  |
Amount of credit facility | $ 8,000 |  |  |  |  |  |  |  |  |  |
Uncommitted demand credit facilities |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount of credit facility |  |  |  |  | 1,400 |  | 1,400 |  |  |  | 849
Unutilized amount of facility |  |  |  |  | $ 978 |  | $ 978 |  |  |  | $ 533

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