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Investments - Narrative (Details) - CAD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items] |  |  |
Gain from investment | $ 56 | $ 196 | $ 141
Investment in PrairieSky Royalty Ltd. |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Number of shares held as investment (in shares) | 22.6 |  |
Market price per common share (CAD per share) | $ 23.20 | $ 21.70 | $ 13.63
Gain from investment | $ 56 | $ 196 | $ 88
Fair value gain from investment | 34 | 182 | 81
Dividend income | $ 22 | $ 14 | $ 7
Inter Pipeline Ltd. |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Number of shares held as investment (in shares) |  |  | 6.4
Cash proceeds |  |  | $ 128
Cash proceeds per common share (CAD per share) |  |  | $ 20.00
Gain from investment |  |  | $ 53
Fair value gain from investment |  |  | 51
Dividend income |  |  | $ 2

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