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v3.25.3

Income taxes (Details) $ in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 CAD ($) | Sep. 30, 2024 CAD ($) | Sep. 30, 2025 CAD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 CAD ($)
Income Tax Disclosure [Abstract] |  |  |  |  |
Effective tax rate | 24.34% | 23.88% | 23.58% | 23.58% | 24.44%
Effective tax rate, excluding discrete items | 24.50% | 24.24% | 24.50% | 24.50% | 24.75%
Deferred income tax recovery |  |  |  |  | $ 3
Business Combination [Line Items] |  |  |  |  |
Settlement of Mexican tax audits | $ 0 | $ 2 | $ 12 |  | 2
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Gain on sale of equity investment | 0 | 0 | 333 |  | 0
Mexican Tax Authority |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |
Other tax expense (recovery) |  | (7) |  |  | 3
Settlement of Mexican tax audits |  |  | 11 |  |
Panama Canal Railway Company |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Gain on sale of equity investment |  |  | 333 | $ 232 |
KCS |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |
Amortization of fair value adjustments | 97 | 90 | 287 |  | 264
Acquisition-related costs | $ 13 | $ 36 | $ 52 |  | $ 90

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