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AQUISITIONS AND DISPOSITIONS - Narrative (Details) - Dispositions $ in Millions |  |  |  | 9 Months Ended
--- | --- | --- | --- | ---
Jun. 01, 2020 CAD ($) | May 01, 2020 CAD ($) | Apr. 01, 2020 CAD ($) | Apr. 01, 2020 USD ($) | Sep. 30, 2020 CAD ($) | Sep. 30, 2020 USD ($)
Line 10 Crude Oil Pipeline |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain (loss) on disposal | $ 0 |  |  |  |  |
Montana-Alberta Tie Line Transmission Assets |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  | $ 4,000,000 |
Proceeds from dispositions |  | $ 189,000,000 |  |  |  |
Ozark assets |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  | $ 1,000,000 | $ 1
Proceeds from dispositions |  |  | $ 63,000,000 | $ 45 |  |

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