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GOODWILL (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Goodwill [Roll Forward] |  |  |
Goodwill, beginning balance | $ 32,688 | $ 33,153 |
Foreign exchange and other | (200) | (487) |
Acquisition | 287 | 22 |
Goodwill, ending balance | 32,775 | 32,688 | $ 33,153
Goodwill [Abstract] |  |  |
Goodwill, gross at end of period | 34,400 | 34,300 |
Goodwill accumulated impairment | 1,600 | 1,600 |
Goodwill related to acquisition | 287 | 22 |
Goodwill on the acquisition | 319 | 6 | (254)
Moda Midstream Operating, LLC (Moda) |  |  |
Goodwill [Roll Forward] |  |  |
Acquisition | 268 |  |
Goodwill [Abstract] |  |  |
Goodwill related to acquisition | 268 |  |
Liquids Pipelines |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, beginning balance | 7,828 | 7,951 |
Foreign exchange and other | (55) | (123) |
Acquisition | 268 | 0 |
Goodwill, ending balance | 8,041 | 7,828 | 7,951
Goodwill [Abstract] |  |  |
Goodwill related to acquisition | 268 | 0 |
Gas Transmission and Midstream |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, beginning balance | 19,480 | 19,844 |
Foreign exchange and other | (145) | (364) |
Acquisition | 0 | 0 |
Goodwill, ending balance | 19,335 | 19,480 | 19,844
Goodwill [Abstract] |  |  |
Goodwill related to acquisition | 0 | 0 |
Gas Distribution and Storage |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, beginning balance | 5,378 | 5,356 |
Foreign exchange and other | 0 | 0 |
Acquisition | 19 | 22 |
Goodwill, ending balance | 5,397 | 5,378 | 5,356
Goodwill [Abstract] |  |  |
Goodwill related to acquisition | 19 | 22 |
Energy Services |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, beginning balance | 2 | 2 |
Foreign exchange and other | 0 | 0 |
Acquisition | 0 | 0 |
Goodwill, ending balance | 2 | 2 | $ 2
Goodwill [Abstract] |  |  |
Goodwill related to acquisition | $ 0 | $ 0 |

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