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GOODWILL - NARRATIVE (Details) - CAD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Jul. 04, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Feb. 27, 2017
GOODWILL |  |  |  |  |
Impairment of goodwill |  | $ 0 | $ 1,019 | $ 102 |
Goodwill |  | $ 33,153 | 34,459 |  |
Spectra Energy Corp |  |  |  |  |
GOODWILL |  |  |  |  |
Goodwill |  |  |  | $ 36,700 | $ 36,656
Dispositions | Midcoast Operating L.P. |  |  |  |  |
GOODWILL |  |  |  |  |
Goodwill, write of due to deconsolidation |  |  | 262 |  |
Dispositions | Canadian Natural Gas Gathering and Processing Business |  |  |  |  |
GOODWILL |  |  |  |  |
Impairment of goodwill | $ 1,019 |  |  |  |
Goodwill, write of due to deconsolidation |  |  | $ 366 |  |

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