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ACQUISITIONS AND DISPOSITIONS - Acquisitions (Narrative) (Details) $ in Millions |  | 10 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 27, 2017 CAD ($) shares | Dec. 31, 2017 CAD ($) | Dec. 31, 2019 CAD ($) reporting_unit | Dec. 31, 2017 CAD ($) | Dec. 31, 2018 CAD ($) | Feb. 27, 2017 $ / shares
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  | $ 33,153 |  | $ 34,459 |
Spectra Energy Capital, LLC |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill | $ 36,656 | $ 36,700 |  | $ 36,700 |  |
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% |  |  |  |  |
Cash paid in lieu of fractional shares | $ 3 |  |  |  |  |
Acquisition-related expenses/transaction costs incurred | $ 231 |  |  |  |  |
Costs incurred |  |  |  | $ 180 |  |
Revenues generated by acquiree |  | 5,740 |  |  |  |
Earnings generated by acquiree |  | $ 2,574 |  |  |  |
Common Shares | Spectra Energy Capital, LLC |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Shares paid as consideration (in shares) | shares | 691,000,000 |  |  |  |  |
Share price (in USD per share) | $ / shares |  |  |  |  |  | $ 41.34
Value of shares issued | $ 37,429 |  |  |  |  |
Share options | Spectra Energy Capital, LLC |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Shares paid as consideration (in shares) | shares | 3,500,000 |  |  |  |  |
Value of shares issued | $ 77 |  |  |  |  |
Gas Transmission and Midstream |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  | $ 19,844 |  | $ 20,777 |
Number of reporting units | reporting_unit |  |  | 2 |  |  |

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