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ACQUISITIONS AND DISPOSITIONS - Equity Investment Transaction (Narrative) (Details) $ in Millions, $ in Millions | Jul. 17, 2025 CAD ($) | Jul. 17, 2025 USD ($) | May 29, 2024 CAD ($) | May 29, 2024 USD ($)
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Whistler Parent JV |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership interest (as percent) |  |  | 19.00% | 19.00%
Cash consideration includes an upfront payment |  |  | $ 487 | $ 357
Reduction to property, plant and equipment, net and increase to long-term investments |  |  | $ 321 | $ 235
Whistler Parent JV | WhiteWaterI Squared |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership interest (as percent) |  |  | 50.60% | 50.60%
Whistler Parent JV | MPLX |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership interest (as percent) |  |  | 30.40% | 30.40%
Whistler Parent JV | Subsequent Event |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Net proceeds on redemption | $ 180 | $ 130 |  |
Rio Bravo |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership interest (as percent) |  |  | 100.00% | 100.00%
Economic interest in joint venture |  |  | 25.00% | 25.00%
Capital Expenditure, Discontinued Operations |  |  |  | $ 150

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