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Financial Instruments and Financial Risk Management - Summary of Contractual Undiscounted Cash Flow Requirements for Financial Liabilities (Details) - CAD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Disclosure of detailed information about financial instruments [line items] |  |  |
Lease liabilities | $ 951 | $ 1,061 | $ 571
QB advances from SMM/SC | 4,483 | $ 3,497 |
Liquidity risk |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Trade accounts payable and other financial liabilities | 2,576 |  |
Debt (Note 22(f)) | 4,577 |  |
Lease liabilities | 1,555 |  |
Codelco preferential dividend liability | 713 |  |
Other liabilities | 221 |  |
Estimated interest payments on debt and QB advances from SMM/SC | 1,687 |  |
Downstream pipeline take-or-pay toll commitment | 426 |  |
Financial liabilities, contractual cash flows | 18,807 |  |
Liquidity risk | QB2 |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
QB advances from SMM/SC | 4,512 |  |
QB variable consideration to IMSA | 140 |  |
Estimated interest payments on debt and QB advances from SMM/SC | 2,354 |  |
Liquidity risk | Lease and Other Liabilities |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Estimated interest payments on debt and QB advances from SMM/SC | 46 |  |
Less Than 1 Year | Liquidity risk |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Trade accounts payable and other financial liabilities | 2,576 |  |
Debt (Note 22(f)) | 423 |  |
Lease liabilities | 175 |  |
Codelco preferential dividend liability | 0 |  |
Other liabilities | 0 |  |
Estimated interest payments on debt and QB advances from SMM/SC | 267 |  |
Downstream pipeline take-or-pay toll commitment | 33 |  |
Financial liabilities, contractual cash flows | 3,924 |  |
Less Than 1 Year | Liquidity risk | QB2 |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
QB advances from SMM/SC | 0 |  |
QB variable consideration to IMSA | 72 |  |
Estimated interest payments on debt and QB advances from SMM/SC | 372 |  |
Less Than 1 Year | Liquidity risk | Lease and Other Liabilities |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Estimated interest payments on debt and QB advances from SMM/SC | 6 |  |
2–3 Years | Liquidity risk |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Trade accounts payable and other financial liabilities | 0 |  |
Debt (Note 22(f)) | 1,170 |  |
Lease liabilities | 248 |  |
Codelco preferential dividend liability | 0 |  |
Other liabilities | 198 |  |
Estimated interest payments on debt and QB advances from SMM/SC | 372 |  |
Downstream pipeline take-or-pay toll commitment | 70 |  |
Financial liabilities, contractual cash flows | 2,833 |  |
2–3 Years | Liquidity risk | QB2 |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
QB advances from SMM/SC | 0 |  |
QB variable consideration to IMSA | 68 |  |
Estimated interest payments on debt and QB advances from SMM/SC | 700 |  |
2–3 Years | Liquidity risk | Lease and Other Liabilities |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Estimated interest payments on debt and QB advances from SMM/SC | 7 |  |
4–5 Years | Liquidity risk |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Trade accounts payable and other financial liabilities | 0 |  |
Debt (Note 22(f)) | 846 |  |
Lease liabilities | 916 |  |
Codelco preferential dividend liability | 494 |  |
Other liabilities | 11 |  |
Estimated interest payments on debt and QB advances from SMM/SC | 242 |  |
Downstream pipeline take-or-pay toll commitment | 75 |  |
Financial liabilities, contractual cash flows | 3,211 |  |
4–5 Years | Liquidity risk | QB2 |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
QB advances from SMM/SC | 0 |  |
QB variable consideration to IMSA | 0 |  |
Estimated interest payments on debt and QB advances from SMM/SC | 600 |  |
4–5 Years | Liquidity risk | Lease and Other Liabilities |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Estimated interest payments on debt and QB advances from SMM/SC | 27 |  |
More Than 5 Years | Liquidity risk |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Trade accounts payable and other financial liabilities | 0 |  |
Debt (Note 22(f)) | 2,138 |  |
Lease liabilities | 216 |  |
Codelco preferential dividend liability | 219 |  |
Other liabilities | 12 |  |
Estimated interest payments on debt and QB advances from SMM/SC | 806 |  |
Downstream pipeline take-or-pay toll commitment | 248 |  |
Financial liabilities, contractual cash flows | 8,839 |  |
More Than 5 Years | Liquidity risk | QB2 |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
QB advances from SMM/SC | 4,512 |  |
QB variable consideration to IMSA | 0 |  |
Estimated interest payments on debt and QB advances from SMM/SC | 682 |  |
More Than 5 Years | Liquidity risk | Lease and Other Liabilities |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Estimated interest payments on debt and QB advances from SMM/SC | $ 6 |  |

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