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ACQUISITIONS AND DISPOSITIONS - Summary of Estimated Fair Values Assigned to Net Assets (Details) $ in Millions, $ in Millions | Nov. 01, 2023 CAD ($) | Sep. 27, 2022 CAD ($) | Sep. 27, 2022 USD ($) | Oct. 12, 2021 CAD ($) | Oct. 12, 2021 USD ($) | Dec. 31, 2023 CAD ($) | Nov. 01, 2023 USD ($) | Dec. 31, 2022 CAD ($) | Sep. 27, 2022 USD ($) | Dec. 31, 2021 CAD ($) | Oct. 12, 2021 USD ($)
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Fair value of net assets acquired: |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 31,848 |  | $ 32,440 |  | $ 32,775 |
Purchase price: |  |  |  |  |  |  |  |  |  |  |
Goodwill expected tax deductible period | 15 years |  |  |  |  |  |  |  |  |  |
Aitken Creek Gas Storage Facility |  |  |  |  |  |  |  |  |  |  |
Fair value of net assets acquired: |  |  |  |  |  |  |  |  |  |  |
Current assets | $ 105 |  |  |  |  |  |  |  |  |  |
Property, plant and equipment | 466 |  |  |  |  |  |  |  |  |  |
Current liabilities | 20 |  |  |  |  |  |  |  |  |  |
Long-term liabilities | 130 |  |  |  |  |  |  |  |  |  |
Goodwill | 46 |  |  |  |  | $ 46 |  |  |  |  |
Purchase price: |  |  |  |  |  |  |  |  |  |  |
Cash | 397 |  |  |  |  |  |  |  |  |  |
Contingent consideration | 70 |  |  |  |  |  |  |  |  |  |
Purchase price | $ 467 |  |  |  |  |  |  |  |  |  |
Expected useful life | 3 years 6 months |  |  |  |  |  | 3 years 6 months |  |  |  |
Tri Global Energy, LLC |  |  |  |  |  |  |  |  |  |  |
Fair value of net assets acquired: |  |  |  |  |  |  |  |  |  |  |
Current assets |  | $ 5 |  |  |  |  |  |  |  |  |
Property, plant and equipment |  | 3 |  |  |  |  |  |  |  |  |
Long-term investments |  | 8 |  |  |  |  |  |  |  |  |
Intangible assets |  | 117 |  |  |  |  |  |  |  |  |
Long-term assets |  | 3 |  |  |  |  |  |  |  |  |
Current liabilities |  | 61 |  |  |  |  |  |  |  |  |
Long-term debt |  | 18 |  |  |  |  |  |  |  |  |
Long-term liabilities |  | 105 |  |  |  |  |  |  |  |  |
Goodwill |  | 392 |  |  |  |  |  | $ 392 |  |  |
Purchase price: |  |  |  |  |  |  |  |  |  |  |
Cash |  | 295 | $ 215 |  |  |  |  |  |  |  |
Contingent consideration |  | 49 |  |  |  |  | $ 36 |  |  |  |
Purchase price |  | $ 344 |  |  |  |  |  |  |  |  |
Expected useful life |  | 3 years 6 months |  |  |  |  |  |  | 3 years 6 months |  |
Goodwill expected tax deductible period |  | 15 years | 15 years |  |  |  |  |  |  |  |
Contingent future payment (up to) |  | $ 72 |  |  |  |  | $ 53 |  | $ 53 |  |
Moda Midstream Operating, LLC (Moda) |  |  |  |  |  |  |  |  |  |  |
Fair value of net assets acquired: |  |  |  |  |  |  |  |  |  |  |
Current assets |  |  |  | $ 62 |  |  |  |  |  |  |
Property, plant and equipment |  |  |  | 1,480 |  |  |  |  |  |  |
Long-term investments |  |  |  | 427 |  |  |  |  |  |  |
Intangible assets |  |  |  | 1,781 |  |  |  |  |  |  |
Current liabilities |  |  |  | 59 |  |  |  |  |  |  |
Long-term liabilities |  |  |  | 17 |  |  |  |  |  |  |
Goodwill |  |  |  | 268 |  |  |  |  |  |  |
Purchase price: |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  | 3,755 | $ 3,000 |  |  |  |  |  |
Contingent consideration |  |  |  | 187 |  |  |  |  |  |  | $ 150
Purchase price |  |  |  | $ 3,942 |  |  |  |  |  |  |
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 |  |  |  |  |  |

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