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ACQUISITIONS AND DISPOSITIONS - Acquisitions (Narrative) (Details) $ in Millions |  |  | 9 Months Ended | 10 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Feb. 27, 2017 CAD ($) shares | Apr. 01, 2016 CAD ($) | Dec. 31, 2016 CAD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2018 CAD ($) reporting_unit | Dec. 31, 2017 CAD ($) | Dec. 31, 2016 CAD ($) | Feb. 27, 2017 $ / shares
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of reporting units | reporting_unit |  |  |  |  | 2 |  |  |
Cash consideration |  |  |  |  | $ 0 | $ 0 | $ 644 |
Spectra Energy |  |  |  |  |  |  |  |
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%
Cash paid in lieu of fractional shares | $ 3 |  |  |  |  |  |  |
Acquisition-related expenses/transaction costs incurred |  |  |  |  | $ 231 |  |  |
Costs incurred |  |  |  |  |  | 180 | 51 |
Revenues generated by acquiree |  |  |  | $ 5,740 |  |  |  |
Earnings generated by acquiree |  |  |  | $ 2,574 |  |  |  |
Cash consideration | $ 3 |  |  |  |  |  |  |
Pro forma revenues |  |  |  |  |  | $ 45,669 | 40,934 |
Tupper Main and Tupper West |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisition-related expenses/transaction costs incurred |  | $ 1 |  |  |  |  |  |
Revenues generated by acquiree |  |  | $ 33 |  |  |  |  |
Cash consideration |  | $ 539 |  |  |  |  |  |
Earnings before interest and income taxes of acquiree |  |  | $ 22 |  |  |  |  |
Pro forma revenues |  |  |  |  |  |  | 44 |
Pro forma earnings before interest and income taxes |  |  |  |  |  |  | $ 28 |
Common shares | Spectra Energy |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |
Number of reporting units | reporting_unit |  |  |  |  | 2 |  |  |

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- Definition The pro forma earnings before interest and income taxes for the period as if the business combination or combinations had been completed at the beginning of a period. + References No definition available. + Details
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