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Gain on sale of equity investment (Details) $ in Millions, $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Apr. 01, 2025 USD ($) | Sep. 30, 2025 CAD ($) | Sep. 30, 2024 CAD ($) | Sep. 30, 2025 CAD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 CAD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Proceeds from sale of equity method investments |  | $ 0 | $ 0 | $ 493 |  | $ 0
Gain on sale of equity investment |  | $ 0 | $ 0 | 333 |  | $ 0
Panama Canal Railway Company |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage sold | 50.00% |  |  |  |  |
Equity method investments, Gross sale amount | $ 350 |  |  |  |  |
Proceeds from sale of equity method investments |  |  |  | 493 | $ 344 |
Gain on sale of equity investment |  |  |  | 333 | 232 |
Equity method investment, realized gain on disposal, after tax |  |  |  | $ 282 | $ 196 |

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