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ACQUISITIONS AND DISPOSITIONS - Acquisitions (Narrative) (Details) - Moda Midstream Operating, LLC (Moda) $ in Millions, $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 12, 2021 USD ($) | Oct. 12, 2021 CAD ($) | Dec. 31, 2021 CAD ($) | Dec. 31, 2021 CAD ($) | Oct. 12, 2021 CAD ($)
Business Acquisition [Line Items] |  |  |  |  |
Cash | $ 3,000 | $ 3,755 |  |  |
Contingent consideration | $ 150 |  |  |  | $ 187
Ownership interest acquired (as a percent) | 20.00% |  |  |  | 20.00%
Amortized on a straight-line basis over an expected useful life | 10 years | 10 years |  |  |
Tax deductible period | 15 years | 15 years |  |  |
Acquisition-related expenses/transaction costs incurred |  |  |  | $ 21 |
Revenues generated by acquiree |  |  | $ 80 |  |
Earnings generated by acquiree |  |  | $ 9 |  |

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