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Supplementary Cash Flow Information - Non-Cash Working Capital (Details) - CAD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Disclosure Of Supplementary Cash Flow Information [Line Items] |  |  |  |  |
Total Current Assets | $ 9,769 |  | $ 9,769 |  | $ 10,434
Total Current Liabilities | 5,651 |  | 5,651 |  | 7,362
Working Capital | 4,118 |  | 4,118 |  | $ 3,072
Accounts Receivable and Accrued Revenues | (177) | $ 904 | (542) | $ 326 |
Income Tax Receivable | 6 | 14 | 172 | 191 |
Inventories | (19) | 480 | 421 | 99 |
Accounts Payable and Accrued Liabilities | (188) | (896) | (186) | 60 |
Income Tax Payable | (22) | 105 | (304) | 96 |
Total Change in Non-Cash Working Capital | (400) | 607 | (439) | 772 |
Net Change in Non-Cash Working Capital – Operating Activities | (241) | 588 | (179) | 813 |
Net Change in Non-Cash Working Capital – Investing Activities | $ (159) | $ 19 | $ (260) | $ (41) |

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