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Debt - Summary of Detailed Information About Borrowings (Details) $ in Millions, $ in Millions | Dec. 31, 2022 CAD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 CAD ($) | Dec. 31, 2021 USD ($)
--- | --- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | $ 7,167 |  | $ 7,374 |
Less current portion of debt | (616) |  | (213) |
Borrowings | $ 6,551 |  | 7,161 |
4.75% notes due January 2022 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate of notes | 4.75% | 4.75% |  |
Gross debt | $ 0 |  | 190 |
3.75% notes due February 2023 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate of notes | 3.75% | 3.75% |  |
Gross debt | $ 147 |  | 137 |
3.9% notes due July 2030 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate of notes | 3.90% | 3.90% |  |
Gross debt | $ 673 |  | 688 |
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 | $ 449 |  | 761 |
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 | $ 648 |  | 620 |
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 | $ 531 |  | 997 |
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 | $ 529 |  | 500 |
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 | $ 492 |  | 473 |
Notes issued |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 3,469 |  | 4,366 |
Quebrada Blanca Phase 2 project facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 3,322 |  | 2,785 |
Revolving credit facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 71 |  | 0 |
Antamina loan agreements |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 305 |  | 223 |
Face Value |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | $ 5,362 |  | $ 5,906
Less current portion of debt |  | (454) |  | (168)
Borrowings |  | 4,908 |  | 5,738
Face Value | 4.75% notes due January 2022 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 0 |  | 150
Face Value | 3.75% notes due February 2023 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 108 |  | 108
Face Value | 3.9% notes due July 2030 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 503 |  | 550
Face Value | 6.125% notes due October 2035 (a) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 336 |  | 609
Face Value | 6.0% notes due August 2040 (a) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 480 |  | 490
Face Value | 6.25% notes due July 2041 (a) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 396 |  | 795
Face Value | 5.2% notes due March 2042 (a) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 395 |  | 399
Face Value | 5.4% notes due February 2043 (a) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 367 |  | 377
Face Value | Notes issued |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 2,585 |  | 3,478
Face Value | Quebrada Blanca Phase 2 project facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 2,500 |  | 2,252
Face Value | Revolving credit facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 52 |  | 0
Face Value | Antamina loan agreements |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | $ 225 |  | $ 176
Fair Value |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 7,089 |  | 8,570 |
Less current portion of debt | (616) |  | (213) |
Borrowings | 6,473 |  | 8,357 |
Fair Value | 4.75% notes due January 2022 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 0 |  | 190 |
Fair Value | 3.75% notes due February 2023 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 147 |  | 140 |
Fair Value | 3.9% notes due July 2030 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 614 |  | 751 |
Fair Value | 6.125% notes due October 2035 (a) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 452 |  | 1,005 |
Fair Value | 6.0% notes due August 2040 (a) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 631 |  | 795 |
Fair Value | 6.25% notes due July 2041 (a) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 531 |  | 1,349 |
Fair Value | 5.2% notes due March 2042 (a) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 471 |  | 602 |
Fair Value | 5.4% notes due February 2043 (a) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 448 |  | 586 |
Fair Value | Notes issued |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 3,294 |  | 5,418 |
Fair Value | Quebrada Blanca Phase 2 project facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 3,419 |  | 2,929 |
Fair Value | Revolving credit facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 71 |  | 0 |
Fair Value | Antamina loan agreements |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | $ 305 |  | $ 223 |

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