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GOODWILL (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Goodwill [Roll Forward] |  |
Goodwill, beginning balance | $ 33,153 | $ 34,459
Acquisition | 22 |
Foreign exchange and other | (487) | (1,306)
Goodwill, ending balance | 32,688 | 33,153
Goodwill [Abstract] |  |
Goodwill, gross at end of period | 34,300 | 34,700
Goodwill accumulated impairment | 1,600 | 1,600
Gas Distribution and Storage |  |
Goodwill [Roll Forward] |  |
Goodwill, beginning balance | 5,356 | 5,356
Acquisition | 22 |
Foreign exchange and other | 0 | 0
Goodwill, ending balance | 5,378 | 5,356
Liquids Pipelines |  |
Goodwill [Roll Forward] |  |
Goodwill, beginning balance | 7,951 | 8,324
Acquisition | 0 |
Foreign exchange and other | (123) | (373)
Goodwill, ending balance | 7,828 | 7,951
Gas Transmission and Midstream |  |
Goodwill [Roll Forward] |  |
Goodwill, beginning balance | 19,844 | 20,777
Acquisition | 0 |
Foreign exchange and other | (364) | (933)
Goodwill, ending balance | 19,480 | 19,844
Energy Services |  |
Goodwill [Roll Forward] |  |
Goodwill, beginning balance | 2 | 2
Acquisition | 0 |
Foreign exchange and other | 0 | 0
Goodwill, ending balance | $ 2 | $ 2

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