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Debt - Summary of Detailed Information About Borrowings (Detail) $ in Millions, $ in Millions | Dec. 31, 2021 CAD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 USD ($)
--- | --- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | $ 7,374 |  | $ 6,255 |
Less current portion of debt | (213) |  | (115) |
Borrowings | $ 7,161 |  | $ 6,140 |
4.5% notes due January 2021 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate of notes |  |  | 4.50% | 4.50%
4.75% notes due January 2022 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate of notes | 4.75% | 4.75% | 4.75% | 4.75%
Gross debt | $ 190 |  | $ 190 |
3.75% notes due February 2023 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate of notes | 3.75% | 3.75% | 3.75% | 3.75%
Gross debt | $ 137 |  | $ 139 |
3.9% notes due July 2030 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate of notes | 3.90% | 3.90% |  |
Gross debt | $ 688 |  | 690 |
6.125% notes due October 2035 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate of notes | 6.125% | 6.125% |  |
Gross debt | $ 761 |  | 764 |
6.0% notes due August 2040 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate of notes | 6.00% | 6.00% |  |
Gross debt | $ 620 |  | 622 |
6.25% notes due July 2041 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate of notes | 6.25% | 6.25% |  |
Gross debt | $ 997 |  | 1,001 |
5.2% notes due March 2042 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate of notes | 5.20% | 5.20% |  |
Gross debt | $ 500 |  | 502 |
5.4% notes due February 2043 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate of notes | 5.40% | 5.40% |  |
Gross debt | $ 473 |  | 475 |
Notes issued |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 4,366 |  | 4,383 |
Quebrada Blanca Phase 2 project facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 2,785 | $ 2,300 | 1,423 |
Revolving credit facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 0 |  | 334 |
Antamina loan agreements |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 223 |  | 115 |
Face Value |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 5,906 |  | $ 4,977
Less current portion of debt |  | (168) |  | (90)
Borrowings |  | 5,738 |  | 4,887
Face Value | 4.75% notes due January 2022 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 150 |  | 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 |  | 550 |  | 550
Face Value | 6.125% notes due October 2035 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 609 |  | 609
Face Value | 6.0% notes due August 2040 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 490 |  | 490
Face Value | 6.25% notes due July 2041 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 795 |  | 795
Face Value | 5.2% notes due March 2042 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 399 |  | 399
Face Value | 5.4% notes due February 2043 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 377 |  | 377
Face Value | Notes issued |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 3,478 |  | 3,478
Face Value | Quebrada Blanca Phase 2 project facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 2,252 |  | 1,147
Face Value | Revolving credit facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 0 |  | 262
Face Value | Antamina loan agreements |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | $ 176 |  | $ 90
Fair Value |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 8,570 |  | 7,291 |
Less current portion of debt | (213) |  | (115) |
Borrowings | 8,357 |  | 7,176 |
Fair Value | 4.75% notes due January 2022 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 190 |  | 195 |
Fair Value | 3.75% notes due February 2023 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 140 |  | 144 |
Fair Value | 3.9% notes due July 2030 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 751 |  | 781 |
Fair Value | 6.125% notes due October 2035 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 1,005 |  | 1,005 |
Fair Value | 6.0% notes due August 2040 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 795 |  | 782 |
Fair Value | 6.25% notes due July 2041 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 1,349 |  | 1,309 |
Fair Value | 5.2% notes due March 2042 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 602 |  | 596 |
Fair Value | 5.4% notes due February 2043 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 586 |  | 571 |
Fair Value | Notes issued |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 5,418 |  | 5,383 |
Fair Value | Quebrada Blanca Phase 2 project facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 2,929 |  | 1,459 |
Fair Value | Revolving credit facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 0 |  | 334 |
Fair Value | Antamina loan agreements |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | $ 223 |  | $ 115 |

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