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Investments - Narrative (Details) - CAD ($) $ / shares in Units, shares in Millions, $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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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) | $ 13.63 | $ 10.09 | $ 15.23
Investment in Inter Pipeline Ltd. |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Number of shares held as investment (in shares) | 6.4 |  |
Market price per common share (CAD per share) |  | $ 11.87 | $ 22.54
Cash proceeds | $ 128 |  |
Cash proceeds per common share (CAD per share) | $ 20.00 |  |

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