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Supplemental Cash Flow Information - Narrative (Details) $ in Millions, $ in Billions |  | 12 Months Ended |
--- | --- | --- | ---
Jul. 11, 2024 CAD ($) | Jul. 11, 2024 USD ($) | Dec. 31, 2024 CAD ($) | Dec. 31, 2023 CAD ($) | Dec. 31, 2022 CAD ($)
Disclosure of joint ventures [line items] |  |  |  |  |
Cash and cash equivalents |  |  | $ 7,587 | $ 744 | $ 1,883
Net proceeds from sale of discontinued operations and other |  |  | 9,538 | 1,048 |
Discontinued operations |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Proceeds from sale of business | $ 9,900 | $ 7.3 |  |  |
Cash and cash equivalents classified as part of disposal group held for sale | 257 |  |  |  |
Discontinued Operations, Including Disposal Group, Post Closing Adjustments |  |  | 160 |  |
Net proceeds from sale of discontinued operations and other | $ 9,500 |  |  |  |
Quebrada Blanca SA |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Cash and cash equivalents |  |  | $ 165 | $ 167 |

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