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ACQUISITIONS AND DISPOSITIONS - Acquisitions (Narrative) (Details) $ in Millions, $ in Millions |  |  | 3 Months Ended | 12 Months Ended |  |  |
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Sep. 27, 2022 CAD ($) | Sep. 27, 2022 USD ($) | Oct. 12, 2021 CAD ($) | Oct. 12, 2021 USD ($) | Dec. 31, 2021 CAD ($) | Dec. 31, 2021 CAD ($) | Oct. 05, 2022 | Sep. 27, 2022 USD ($) | Oct. 12, 2021 USD ($)
Athabasca Regional Oil Sands System | Athabasca Regional Oil Sands System |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Noncontrolling interest (percent) |  |  |  |  |  |  | 88.40% |  |
Moda Midstream Operating, LLC (Moda) |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash |  |  | $ 3,755 | $ 3,000 |  |  |  |  |
Contingent consideration |  |  | $ 187 |  |  |  |  |  | $ 150
Acquisition-related expenses/transaction costs incurred |  |  |  |  |  | $ 21 |  |  |
Revenues generated by acquiree |  |  |  |  | $ 80 |  |  |  |
Earnings generated by acquiree |  |  |  |  | $ 9 |  |  |  |
Tri Global Energy, LLC |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash | $ 295 | $ 215 |  |  |  |  |  |  |
Contingent future payment (up to) | $ 72 |  |  |  |  |  |  | $ 53 |
Expected useful life | 3 years 6 months | 3 years 6 months |  |  |  |  |  |  |
Goodwill expected tax deductible period | 15 years | 15 years |  |  |  |  |  |  |
Contingent consideration | $ 49 |  |  |  |  |  |  | $ 36 |

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