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Supplementary Cash Flow Information - Non-Cash Working Capital (Details) - CAD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Disclosure Of Supplementary Cash Flow Information [Line Items] |  |  |  |  |
Current assets | $ 10,745 |  | $ 10,745 |  | $ 12,430
Current Liabilities | 7,205 |  | 7,205 |  | 8,021
Working Capital | 3,540 |  | 3,540 |  | 4,409
Adjusted working capital | 3,800 |  | 3,800 |  | 4,700
Contingent Payments | 295 |  | 295 |  | $ 263
Accounts Receivable and Accrued Revenues | (1,288) | $ 1,746 | (1,097) | $ 119 |
Income Tax Receivable | 157 | (111) | (12) | (88) |
Inventories | (505) | 1,138 | (343) | (172) |
Accounts Payable and Accrued Liabilities | 851 | (1,547) | 69 | (388) |
Income Tax Payable | 107 | 74 | (1,056) | 877 |
Total Change in Non-Cash Working Capital | (678) | 1,300 | (2,439) | 348 |
Net Change in Non-Cash Working Capital – Operating Activities | (641) | 1,193 | (2,142) | (98) |
Net Change in Non-Cash Working Capital – Investing Activities | $ (37) | $ 107 | $ (297) | $ 446 |

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