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DEBT - Credit Facilities (Narrative) (Details) $ in Millions |  |  |  |  |  | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 10, 2022 CAD ($) | Jan. 19, 2022 CAD ($) | Jul. 23, 2021 CAD ($) | Feb. 25, 2021 CAD ($) loan | Feb. 10, 2021 CAD ($) | Dec. 31, 2021 CAD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) | Oct. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | May 31, 2021 | Mar. 31, 2021 | Feb. 28, 2021 | Dec. 31, 2020 CAD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 3,200,000,000 |  | $ 3,900 |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | 67,961,000,000 |  |  |  |  |  |  |  |  | $ 62,819,000,000
Extinguishment of debt |  |  |  |  |  | 1,100,000,000 | $ 914 |  |  |  |  |  |  |  |
Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |
Number of term loans repaid | loan |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |
Commercial paper and credit facility draws |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | 11,300,000,000 |  |  |  |  |  |  |  |  | 9,900,000,000
Enbridge Gas Inc. | 2.35% medium-term notes due September 2031 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | 475,000,000 |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  | 2.35% |  |  |  |  |
Enbridge Gas Inc. | 3.20% medium-term notes due September 2051 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | 425,000,000 |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  | 3.20% |  |  |  |  |
Enbridge Gas Inc. | 2.76% medium-term notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  | 276.00% |  |  |
Extinguishment of debt |  |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |
Enbridge Gas Inc. | 4.77% medium-term notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  | 477.00% |  | 477.00% |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  |  | $ 175,000,000 |  |  |  |  |  |  |  |  |
Enbridge Pipelines Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility capacity |  |  |  |  |  | 3,000,000,000 |  |  |  |  |  |  |  |  |
Unutilized credit facility |  |  |  |  |  | 2,333,000,000 |  |  |  |  |  |  |  |  |
Enbridge Pipelines Inc. | 2.82% medium-term notes due May 2031 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | 400,000,000 |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  | 2.82% |  |  |
Enbridge Pipelines Inc. | 4.20% medium-term notes due May 2051 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 400,000,000 |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  | 4.20% |  |  |
Spectra Energy Partners, LP | 2.50% senior notes due September 2031 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  | $ 400 |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |
Spectra Energy Partners, LP | 4.60% senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  |  |  | 250 |  |  |  |  |  |  |  |
Enbridge Energy Partners, L.P. | 4.20% senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  | 420.00% |  |  |  |
Extinguishment of debt |  |  |  |  |  |  | 600 |  |  |  |  |  |  |  |
Enbridge Pipelines (Southern Lights) L.L.C. | 3.98% senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  | 398.00% |  | 398.00% |  |  | 398.00% |  |  |  |
Extinguishment of debt |  |  |  |  |  |  | $ 64 |  |  |  |  |  |  |  |
Enbridge Southern Lights LP | 4.01% senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  | 401.00% |  | 401.00% |  |  | 401.00% |  |  |  |
Extinguishment of debt |  |  |  |  |  | $ 16,000,000 |  |  |  |  |  |  |  |  |
Enbridge Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility capacity |  |  |  |  |  | 9,137,000,000 |  |  |  |  |  |  |  |  |
Unutilized credit facility |  |  |  |  |  | 1,300,000,000 |  |  |  |  |  |  |  |  |
Enbridge Inc. | 2.50% Sustainability-linked senior notes due August 2033 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |
Enbridge Inc. | 3.40% senior notes due August 2051 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  | 500 |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  | 3.40% |  |  |  |
Enbridge Inc. | 3.10% Sustainability-linked medium-term notes due September 2033 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | 1,100,000,000 |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  | 3.10% |  |  |  |  |
Enbridge Inc. | 4.10% medium-term notes due September 2051 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | 400,000,000 |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  | 4.10% |  |  |  |  |
Enbridge Inc. | 0.55% senior notes due October 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  | 500 |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  | 0.55% |  |  |  |  |  |
Enbridge Inc. | 1.60% senior notes due October 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  | 500 |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  | 1.60% |  |  |  |  |  |
Enbridge Inc. | 3.40% senior notes due August 2051 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  | $ 500 |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  | 3.40% |  |  |  |  |  |
Enbridge Inc. | 4.26% medium-term notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 426.00% |
Extinguishment of debt |  |  |  |  |  | 200,000,000 |  |  |  |  |  |  |  |  |
Enbridge Inc. | 3.16% medium-term notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  | 316.00% |  |
Extinguishment of debt |  |  |  |  |  | 400,000,000 |  |  |  |  |  |  |  |  |
Spectra Energy Partners, LP | 4.60% senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  | 460.00% |  |
Uncommitted credit facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility capacity |  |  |  |  |  | 1,300,000,000 |  |  |  |  |  |  |  |  | 849,000,000
Unutilized credit facility |  |  |  |  |  | $ 854,000,000 |  |  |  |  |  |  |  |  | $ 533,000,000
Weighted average standby fee (as a percent) |  |  |  |  |  | 0.10% | 0.10% |  |  |  |  |  |  |  |
Revolving Credit Facility | Sustainability-linked Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility capacity |  |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |
Term of credit facility |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Syndicated Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of credit facility |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  | $ 3,000,000,000 |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Five-Year Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility capacity |  |  | $ 8,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Term of credit facility |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | 364-Day Extendible Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility capacity |  |  | $ 10,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Term of credit facility |  |  | 364 days |  |  |  |  |  |  |  |  |  |  |  |
Maturity period |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility capacity | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | 10-year Fixed-To-Fixed Subordinated Notes | Subordinated Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of credit facility |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 750,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Revolving Credit Facility | Sustainability-linked Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility capacity | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of credit facility | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |

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