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Investments - PrairieSky (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of detailed information about financial instruments [line items] |  |  |
Gain from investment | $ (56) | $ (56) | $ (196)
Investment in PrairieSky Royalty Ltd. |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Gain from investment | (50) | (34) | (182)
Dividend income | (6) | (22) | (14)
Gain from investment | $ (56) | $ (56) | $ (196)

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