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Financial Instruments and Financial Risk Management - Summary of Contractual Undiscounted Cash Flow Requirements for Financial Liabilities (Detail) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items] |  |  |
Lease liabilities | $ 1,061 | $ 571 | $ 694
QB2 advances from SMM/SC (Note 22) | 3,497 | 2,279 |
Interest on lease liabilities | 31 | $ 15 |
Liquidity risk |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Trade accounts payable and other financial liabilities | 3,497 |  |
Debt (Note 20(f)) | 6,609 |  |
Lease liabilities | 1,751 |  |
Obligation to Neptune Bulk Terminals | 204 |  |
ENAMI preferential dividend liability | 606 |  |
Other liabilities | 128 |  |
Estimated interest payments on debt | 3,288 |  |
Interest on lease liabilities | 144 |  |
Downstream pipeline take-or-pay toll commitment | 408 |  |
Liquidity risk | QB2 |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
QB2 advances from SMM/SC (Note 22) | 3,520 |  |
QB2 variable consideration to IMSA | 132 |  |
Estimated interest payments on debt | 2,039 |  |
Less Than 1 Year | Liquidity risk |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Trade accounts payable and other financial liabilities | 3,497 |  |
Debt (Note 20(f)) | 515 |  |
Lease liabilities | 197 |  |
Obligation to Neptune Bulk Terminals | 0 |  |
ENAMI preferential dividend liability | 0 |  |
Other liabilities | 0 |  |
Estimated interest payments on debt | 394 |  |
Interest on lease liabilities | 18 |  |
Downstream pipeline take-or-pay toll commitment | 29 |  |
Less Than 1 Year | Liquidity risk | QB2 |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
QB2 advances from SMM/SC (Note 22) | 0 |  |
QB2 variable consideration to IMSA | 0 |  |
Estimated interest payments on debt | 0 |  |
2–3 Years | Liquidity risk |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Trade accounts payable and other financial liabilities | 0 |  |
Debt (Note 20(f)) | 1,076 |  |
Lease liabilities | 261 |  |
Obligation to Neptune Bulk Terminals | 31 |  |
ENAMI preferential dividend liability | 0 |  |
Other liabilities | 104 |  |
Estimated interest payments on debt | 614 |  |
Interest on lease liabilities | 26 |  |
Downstream pipeline take-or-pay toll commitment | 60 |  |
2–3 Years | Liquidity risk | QB2 |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
QB2 advances from SMM/SC (Note 22) | 0 |  |
QB2 variable consideration to IMSA | 132 |  |
Estimated interest payments on debt | 0 |  |
4–5 Years | Liquidity risk |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Trade accounts payable and other financial liabilities | 0 |  |
Debt (Note 20(f)) | 778 |  |
Lease liabilities | 186 |  |
Obligation to Neptune Bulk Terminals | 30 |  |
ENAMI preferential dividend liability | 0 |  |
Other liabilities | 11 |  |
Estimated interest payments on debt | 452 |  |
Interest on lease liabilities | 19 |  |
Downstream pipeline take-or-pay toll commitment | 65 |  |
4–5 Years | Liquidity risk | QB2 |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
QB2 advances from SMM/SC (Note 22) | 0 |  |
QB2 variable consideration to IMSA | 0 |  |
Estimated interest payments on debt | 0 |  |
Thereafter | Liquidity risk |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Trade accounts payable and other financial liabilities | 0 |  |
Debt (Note 20(f)) | 4,240 |  |
Lease liabilities | 1,107 |  |
Obligation to Neptune Bulk Terminals | 143 |  |
ENAMI preferential dividend liability | 606 |  |
Other liabilities | 13 |  |
Estimated interest payments on debt | 1,828 |  |
Interest on lease liabilities | 81 |  |
Downstream pipeline take-or-pay toll commitment | 254 |  |
Thereafter | Liquidity risk | QB2 |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
QB2 advances from SMM/SC (Note 22) | 3,520 |  |
QB2 variable consideration to IMSA | 0 |  |
Estimated interest payments on debt | $ 2,039 |  |

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