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Investments - Inter Pipeline (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of financial assets [line items] |  |  |
(Gain) loss from investment | $ (141) | $ 171 | $ 293
Investment in Inter Pipeline Ltd. |  |  |
Disclosure of financial assets [line items] |  |  |
(Gain) loss from investment | (51) | 68 | (21)
Dividend income | (2) | (5) | (11)
(Gain) loss from investment | $ (53) | $ 63 | $ (32)

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