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Financing costs (Detail) - CAD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Financing costs and additional notes and loans payable information [Abstract] |  |  |  |  |
Debt-related interest |  | $ 39 | $ 48 | $ 103 | $ 152
Capitalized interest |  | (34) | (39) | (86) | (119)
Net interest expense |  | 5 | 9 | 17 | 33
Other interest |  | 3 | 2 | (9) | 4
Total financing | [1] | $ 8 | $ 11 | $ 8 | $ 37
[1] |
(d) Amounts to related parties included in financing. | 30 |  | 40 |  | 79 |  | 127 |

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