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BUSINESS OVERVIEW (Details) $ in Millions |  | 12 Months Ended
--- | --- | ---
Feb. 27, 2017 CAD ($) shares | Dec. 31, 2018 operating_segment
Business Acquisition [Line Items] |  |
Number of operating segments | operating_segment |  | 5
Spectra Energy Corp |  |
Business Acquisition [Line Items] |  |
Purchase price | $ | $ 37,509 |
Shares paid to acquiree for each share of acquiree stock (in shares) | shares | 0.984 |
Ownership interest acquired (as a percent) | 100.00% |

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