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DEBT - Narrative (Details) |  |  |  |  |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 01, 2020 USD ($) | Jul. 24, 2020 CAD ($) | Mar. 31, 2020 CAD ($) | Feb. 25, 2020 USD ($) credit_facility | Feb. 24, 2020 USD ($) | Sep. 30, 2020 CAD ($) | Sep. 30, 2020 CAD ($) | Sep. 30, 2020 USD ($) | Apr. 09, 2020 CAD ($) | Dec. 31, 2019 CAD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Commitment fee percentage |  |  |  |  |  |  | 30.00% |  |  |
Long-term debt |  |  |  |  |  | $ 62,967,000,000 | $ 62,967,000,000 |  |  | $ 59,661,000,000
Principal amount of debt |  |  |  |  |  | 2,500,000,000 | 2,500,000,000 | $ 1,800,000,000 |  |
Long-term debt, fair value adjustment |  |  |  |  |  |  | 783,000,000 |  |  |
Amortization of fair value adjustment |  |  |  |  |  | 13,000,000 | 42,000,000 |  |  |
Commercial paper and credit facility draws |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | 8,700,000,000 | 8,700,000,000 |  |  | 9,000,000,000.0
Fixed-to-floating subordinated term notes | Subordinated term notes |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Subordinated debt |  |  |  |  |  | 8,000,000,000.0 | 8,000,000,000.0 |  |  | 8,000,000,000.0
Fixed-to-fixed subordinated term notes | Subordinated term notes |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Subordinated debt |  |  |  |  |  | 6,600,000,000 | 6,600,000,000 |  |  | 6,600,000,000
Committed credit facilities |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Amount of credit facility |  |  |  |  |  | 24,327,000,000 | 24,327,000,000 |  |  |
Unutilized amount of facility |  |  |  |  |  | 14,005,000,000 | 14,005,000,000 |  |  |
Non-revolving credit facility |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Amount of credit facility |  |  |  |  | $ 1,000,000,000.0 |  |  |  |  |
Term of debt instrument |  |  |  |  | 2 years |  |  |  |  |
Non-revolving, bilateral credit facility |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Amount of credit facility |  |  |  | $ 500,000,000 |  |  |  |  |  |
Number of credit facilities | credit_facility |  |  |  | 2 |  |  |  |  |  |
Term of debt instrument |  |  |  | 1 year |  |  |  |  |  |
Revolving credit facility |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Amount of credit facility |  |  | $ 1,700,000,000 |  |  |  |  |  | $ 3,000,000,000.0 |
Term of debt instrument |  |  | 1 year |  |  |  |  |  |  |
Revolving credit facility | Extendible Credit Facility |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Term out provision |  | 1 year |  |  |  |  |  |  |  |
Term of debt instrument |  | 364 days |  |  |  |  |  |  |  |
Portion of credit facility extended |  | $ 10,000,000,000.0 |  |  |  |  |  |  |  |
Uncommitted demand credit facilities |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Amount of credit facility |  |  |  |  |  | 861,000,000 | 861,000,000 |  |  | 916,000,000
Unutilized amount of facility |  |  |  |  |  | 524,000,000 | $ 524,000,000 |  |  | $ 476,000,000
Enbridge Pipelines Inc. | Committed credit facilities |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Term out provision |  |  |  |  |  |  | 1 year |  |  |
Amount of credit facility |  |  |  |  |  | 3,000,000,000 | $ 3,000,000,000 |  |  |
Unutilized amount of facility |  |  |  |  |  | 1,062,000,000 | $ 1,062,000,000 |  |  |
Enbridge Gas Inc. | Committed credit facilities |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Term out provision |  |  |  |  |  |  | 1 year |  |  |
Amount of credit facility |  |  |  |  |  | 2,000,000,000 | $ 2,000,000,000 |  |  |
Unutilized amount of facility |  |  |  |  |  | $ 1,031,000,000 | $ 1,031,000,000 |  |  |
Spectra Energy Partners, LP | 3.10% 20-Year Senior Notes | Senior Notes | Subsequent event |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Term of debt instrument | 20 years |  |  |  |  |  |  |  |  |
Principal amount of debt | $ 300,000,000 |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 3.10% |  |  |  |  |  |  |  |  |
Spectra Energy Partners, LP | 4.13% Senior Notes | Senior Notes | Subsequent event |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Principal amount of debt | $ 300,000,000 |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 4.13% |  |  |  |  |  |  |  |  |

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