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DEBT - Narrative (Details) |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Feb. 25, 2021 USD ($) debt_instrument | Feb. 10, 2021 CAD ($) | Feb. 28, 2021 USD ($) | Mar. 31, 2021 CAD ($) | Mar. 31, 2021 USD ($) | Mar. 31, 2020 CAD ($) | Dec. 31, 2020 CAD ($) | Mar. 31, 2021 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Principal Amount |  |  |  | $ 600,000,000 | $ 250,000,000 |  |  |
Commitment fee percentage |  |  |  | 0.20% | 0.20% |  |  |
Long-term debt |  |  |  | $ 62,688,000,000 |  |  | $ 62,819,000,000 |
Principal amount of debt |  |  |  |  |  |  |  | $ 500,000,000
Long-term debt, fair value adjustment |  |  |  | 726,000,000 |  |  | 750,000,000 |
Amortization of fair value adjustment |  |  |  | 12,000,000 |  | $ 15,000,000 |  |
Term Loan |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Number of term loans repaid | debt_instrument | 2 |  |  |  |  |  |  |
Principal Amount | $ 500,000,000 |  |  |  |  |  |  |
Commercial paper and credit facility draws |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  |  |  | 10,600,000,000 |  |  | 9,900,000,000 |
Fixed-to-floating subordinated term notes | Subordinated term notes |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Subordinated debt |  |  |  | 7,700,000,000 |  |  | 7,700,000,000 |
Fixed-to-fixed subordinated term notes | Subordinated term notes |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Subordinated debt |  |  |  | 7,800,000,000 |  |  | 7,800,000,000 |
Floating rate notes due February 2023 | Enbridge Inc. |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Term of debt instrument |  |  | 2 years |  |  |  |  |
Principal amount of debt |  |  | $ 500,000,000 |  |  |  |  |
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 |  |  |  | 21,072,000,000 |  |  |  |
Unutilized amount of facility |  |  |  | $ 7,879,000,000 |  |  |  |
Committed credit facilities | Enbridge Inc. |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Term out provision |  |  |  | 1 year | 1 year |  |  |
Amount of credit facility |  |  |  | $ 9,159,000,000 |  |  |  |
Unutilized amount of facility |  |  |  | $ 1,769,000,000 |  |  |  |
Committed credit facilities | Enbridge Pipelines Inc. |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Term out provision |  |  |  | 1 year | 1 year |  |  |
Amount of credit facility |  |  |  | $ 3,000,000,000 |  |  |  |
Unutilized amount of facility |  |  |  | $ 1,642,000,000 |  |  |  |
Committed credit facilities | Enbridge Gas Inc. |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Term out provision |  |  |  | 1 year | 1 year |  |  |
Amount of credit facility |  |  |  | $ 2,000,000,000 |  |  |  |
Unutilized amount of facility |  |  |  | $ 906,000,000 |  |  |  |
Committed credit facilities | Enbridge (U.S.) Inc. |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Term out provision |  |  |  | 1 year | 1 year |  |  |
Amount of credit facility |  |  |  | $ 6,913,000,000 |  |  |  |
Unutilized amount of facility |  |  |  | 3,562,000,000 |  |  |  |
Revolving credit facility | Sustainability-linked Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Term of debt instrument |  | 3 years |  |  |  |  |  |
Amount of credit facility |  | $ 1,000,000,000.0 |  |  |  |  |  |
Revolving credit facility | Syndicated Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Term of debt instrument |  | 1 year |  |  |  |  |  |
Credit facility terminated |  | $ 3,000,000,000.0 |  |  |  |  |  |
Uncommitted demand credit facilities |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Amount of credit facility |  |  |  | 845,000,000 |  |  | 849,000,000 |
Unutilized amount of facility |  |  |  | $ 595,000,000 |  |  | $ 533,000,000 |

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