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Assets Held for Sale - Narrative (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Investment [Line Items] |  |  |
Proceeds on sale of Pioneer Pipeline | $ 0 | $ 0 | $ 128
Gain on sale of assets and other | $ 4 | $ 52 | $ 54

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