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Basis of financial statement preparation (Details) - CAD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Related Party Transaction [Line Items] |  |  |  |  |
Amounts from related parties included in revenues | [1] | $ 11,994 | $ 13,215 | $ 35,668 | $ 38,812
Purchases of crude oil and products | [2] | 7,776 | 8,734 | 22,747 | 25,296
Related Party |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Amounts from related parties included in revenues |  | 3,345 | 3,755 | 10,340 | 10,829
Purchases of crude oil and products |  | $ 1,619 | 1,955 | $ 4,188 | 5,177
Previously Reported | Related Party |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Amounts from related parties included in revenues |  |  | 2,999 |  | 8,674
Purchases of crude oil and products |  |  | $ 1,199 |  | $ 3,022
[1] |
(a) Amounts from related parties included in revenues (note 1) | 3,345 |  | 3,755 |  | 10,340 |  | 10,829 |
[2] |
(b) Amounts to related parties included in purchases of crude oil and products (note 1) | 1,619 |  | 1,955 |  | 4,188 |  | 5,177 |

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