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Risk Management - Additional Information (Details) $ in Millions, $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2025 CAD ($) $ / bbl | Sep. 30, 2025 USD ($) | Dec. 31, 2024 CAD ($) | Dec. 31, 2024 USD ($)
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |
Fair value of derivative financial instruments net | $ 64 |  | $ 7 |
Percentage of accounts receivable outstanding, less than 60 days | 99.00% | 99.00% |  |
Target net debt to adjusted EBITDA ratio | 1.0 |  |  |
Average crude oil price | $ / bbl | 45.00 |  |  |
Fair Value Derivative Financial Instruments |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |
Average contract financial term | 15 months |  |  |
Foreign Exchange Contracts |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |
Fair value of derivative financial instruments net | $ (4) |  |  |
Notional value |  | $ 550 |  | $ 250
Interest Rate Contracts Or Cross Currency Interest Rate Swaps |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |
Notional value | $ 0 |  | $ 0 |
Trade Receivables | Credit risk |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |
Average expected credit loss rate | 0.30% | 0.30% | 0.40% | 0.40%
Trade Receivables | Credit risk | Investment grade counterparties |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |
Number of days outstanding for accruals, joint operations, trade receivables and net investment in finance leases | 60 days | 60 days |  |
Trade Receivables | Credit risk | Investment grade counterparties | Minimum |  |  |  |
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items] |  |  |  |
Percent of accounts receivable held with investment grade counterparties | 73.00% | 73.00% | 79.00% | 79.00%

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