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v3.25.2

Income taxes (Details) $ in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 CAD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2024 CAD ($) | Jun. 30, 2025 CAD ($) | Jun. 30, 2024 CAD ($)
Business Combination [Line Items] |  |  |  |  |
Effective tax rate | 22.45% | 22.45% | 24.40% | 23.26% | 24.72%
Gain on sale of equity investment | $ 333 |  | $ 0 | $ 333 | $ 0
Effective tax rate, excluding discrete items | 24.50% | 24.50% | 25.00% | 24.50% | 25.00%
Other tax expense (recovery) |  |  | $ (3) |  | $ (3)
Settlement of Mexican tax audits | $ 1 |  | 0 | $ 12 | 0
Mexican Tax Authority |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |
Other tax expense (recovery) |  |  |  |  | 10
Settlement of Mexican tax audits |  |  |  | 11 |
Panama Canal Railway Company |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |
Gain on sale of equity investment | 333 | $ 232 |  | 333 |
KCS |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |
Amortization of fair value adjustments | 96 |  | 88 | 190 | 174
Acquisition-related costs | $ 19 |  | $ 28 | $ 39 | $ 54

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