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Contingencies - Legal Proceedings (Details) $ in Millions, $ in Millions |  |  |  |  |  |  | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 05, 2024 USD ($) | Oct. 20, 2023 CAD ($) | Aug. 30, 2023 CAD ($) | Jan. 13, 2023 plaintiff | Oct. 20, 2022 CAD ($) | Jan. 24, 2022 procedural_ground | Sep. 30, 2025 CAD ($) plaintiff claim | Sep. 30, 2025 USD ($) plaintiff claim
Damaged rail cars and lost crude recovery |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Damages awarded | $ 3.9 |  |  |  |  |  |  |
Lac-Megantic Rail Accident |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Number of plaintiffs | plaintiff |  |  |  | 3 |  |  |  |
Lac-Megantic Rail Accident | Claimed derailment damages |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Amount of fund to be distributed |  |  |  |  |  |  | $ 440 |
Lac-Megantic Rail Accident | Quebec Minister of Sustainable Development, Environment, Wildlife and Parks |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Value of damages sought |  |  |  |  |  |  | 95 |
Lac-Megantic Rail Accident | Attorney General of Quebec |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Value of damages sought |  |  |  |  |  |  | 231 |
Initial value of damages sought |  |  |  |  |  |  | 409 |
Lac-Megantic Rail Accident | Initial Subrogated Insurers | Subrogated insurance claim |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Value of damages sought |  |  |  |  |  |  | 14 |
Initial value of damages sought |  |  |  |  |  |  | $ 16 |
Number of subrogated insurer claims | claim |  |  |  |  |  |  | 8 | 8
Lac-Megantic Rail Accident | Additional Subrogated Insurers | Subrogated insurance claim |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Value of damages sought |  |  |  |  |  |  | $ 3 |
Number of subrogated insurer claims | claim |  |  |  |  |  |  | 2 | 2
Lac-Megantic Rail Accident | Class Action Plaintiffs |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Value of damages sought |  |  |  |  |  |  | $ 5 |
Number of plaintiffs | plaintiff |  |  |  |  |  |  | 48 | 48
Number of plaintiffs who opted out | plaintiff |  |  |  |  |  |  | 2 | 2
Number of appeals from bankruptcy procedural grounds | procedural_ground |  |  |  |  |  | 2 |  |
Lac-Megantic Rail Accident | MMAR Estate Representative | Damages for loss in business value |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Value of damages sought |  |  |  |  |  |  |  | $ 30.0
Lac-Megantic Rail Accident | WD Trustee | Damaged rail cars and lost crude recovery |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Value of damages sought |  |  |  |  |  |  |  | 6.0
Lac-Megantic Rail Accident | WD Trustee | Reimbursement for settlement paid by consignor |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Value of damages sought |  |  |  |  |  |  |  | 110.0
Lac-Megantic Rail Accident | WD Trustee | Reimbursement for settlement paid by consignee |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Value of damages sought |  |  |  |  |  |  |  | $ 60.0
Remington Development Corporation legal claim | Remington Development Corporation | Breach of contract |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Damages awarded |  |  | $ 165 |  | $ 164 |  |  |
Total estimated damage |  | $ 232 |  |  |  |  |  |

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