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VARIABLE INTEREST ENTITIES - UNCONSOLIDATED VARIABLE INTEREST ENTITIES (Narrative) (Details) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Aug. 01, 2018 | Dec. 31, 2018 | Apr. 30, 2018
Sabal Trail |  |  |
Variable Interest Entity [Line Items] |  |  |
Direct common interest (as a percent) |  | 50.00% |
Canada Pension Plan Investment Board (CPPIB) | Enbridge Renewable Infrastructure Investments S.a.r.l. (ERII) |  |  |
Variable Interest Entity [Line Items] |  |  |
Direct common interest (as a percent) | 49.00% |  |
Spectra Energy Partners, LP | Sabal Trail |  |  |
Variable Interest Entity [Line Items] |  |  |
Proceeds from issuance of debt |  | $ 744,000,000 |
Enbridge Renewable Infrastructure Investments S.a.r.l. (ERII) |  |  |
Variable Interest Entity [Line Items] |  |  |
Ownership interest of equity method investment (as a percent) | 51.00% |  |
4.246% Senior Notes Due In 2028 | Spectra Energy Partners, LP | Sabal Trail |  |  |
Variable Interest Entity [Line Items] |  |  |
Principal Amount |  |  | $ 500,000,000
Fixed interest rate (as a percent) |  |  | 4.25%
4.682% Senior Notes Due in 2038 | Spectra Energy Partners, LP | Sabal Trail |  |  |
Variable Interest Entity [Line Items] |  |  |
Principal Amount |  |  | $ 600,000,000
Fixed interest rate (as a percent) |  |  | 4.68%
4.832% Senior Notes Due In 2048 | Spectra Energy Partners, LP | Sabal Trail |  |  |
Variable Interest Entity [Line Items] |  |  |
Principal Amount |  |  | $ 400,000,000
Fixed interest rate (as a percent) |  |  | 4.83%

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