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Debt - Summary of Detailed Information About Borrowings (Details) $ in Millions, $ in Millions | Dec. 31, 2024 CAD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 CAD ($) | Dec. 31, 2023 USD ($)
--- | --- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | $ 4,531 |  | $ 6,534 |
Less current portion of debt | (423) |  | (515) |
Borrowings | $ 4,108 |  | 6,019 |
3.9% notes due July 2030 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate of notes | 3.90% | 3.90% |  |
Gross debt | $ 204 |  | 658 |
6.125% notes due October 2035 (a) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate of notes | 6.125% | 6.125% |  |
Gross debt | $ 266 |  | 439 |
6.0% notes due August 2040 (a) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate of notes | 6.00% | 6.00% |  |
Gross debt | $ 278 |  | 624 |
6.25% notes due July 2041 (a) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate of notes | 6.25% | 6.25% |  |
Gross debt | $ 349 |  | 519 |
5.2% notes due March 2042 (a) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate of notes | 5.20% | 5.20% |  |
Gross debt | $ 237 |  | 516 |
5.4% notes due February 2043 (a) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate of notes | 5.40% | 5.40% |  |
Gross debt | $ 154 |  | 481 |
Notes issued |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 1,488 |  | 3,237 |
Quebrada Blanca Phase 2 project facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 2,719 |  | 2,873 |
Carmen de Andacollo short-term loans |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 0 |  | 126 |
Antamina loan agreements |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 324 |  | 298 |
Face Value |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | $ 3,181 |  | $ 4,996
Less current portion of debt |  | (294) |  | (389)
Borrowings |  | 2,887 |  | 4,607
Face Value | 3.9% notes due July 2030 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 143 |  | 503
Face Value | 6.125% notes due October 2035 (a) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 187 |  | 336
Face Value | 6.0% notes due August 2040 (a) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 194 |  | 473
Face Value | 6.25% notes due July 2041 (a) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 245 |  | 396
Face Value | 5.2% notes due March 2042 (a) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 167 |  | 395
Face Value | 5.4% notes due February 2043 (a) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 108 |  | 367
Face Value | Notes issued |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 1,044 |  | 2,470
Face Value | Quebrada Blanca Phase 2 project facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 1,912 |  | 2,206
Face Value | Carmen de Andacollo short-term loans |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 0 |  | 95
Face Value | Antamina loan agreements |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | $ 225 |  | $ 225
Fair Value |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 4,616 |  | 6,631 |
Less current portion of debt | (423) |  | (515) |
Borrowings | 4,193 |  | 6,116 |
Fair Value | 3.9% notes due July 2030 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 196 |  | 621 |
Fair Value | 6.125% notes due October 2035 (a) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 273 |  | 467 |
Fair Value | 6.0% notes due August 2040 (a) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 273 |  | 642 |
Fair Value | 6.25% notes due July 2041 (a) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 350 |  | 544 |
Fair Value | 5.2% notes due March 2042 (a) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 212 |  | 488 |
Fair Value | 5.4% notes due February 2043 (a) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 141 |  | 466 |
Fair Value | Notes issued |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 1,445 |  | 3,228 |
Fair Value | Quebrada Blanca Phase 2 project facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 2,847 |  | 2,979 |
Fair Value | Carmen de Andacollo short-term loans |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 0 |  | 126 |
Fair Value | Antamina loan agreements |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | $ 324 |  | $ 298 |

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