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Debt - Summary of Detailed Information About Borrowings (Detail) $ in Millions, $ in Millions | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2019 USD ($)
--- | --- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | $ 6,255 |  | $ 4,162 |
Less current portion of debt | (115) |  | (29) |
Borrowings | $ 6,140 |  | 4,133 |
4.5% notes due January 2021 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate of notes | 4.50% | 4.50% |  |
Gross debt | $ 0 |  | 152 |
4.75% notes due January 2022 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate of notes | 4.75% | 4.75% |  |
Gross debt | $ 190 |  | 262 |
3.75% notes due February 2023 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate of notes | 3.75% | 3.75% |  |
Gross debt | $ 139 |  | 289 |
3.9% notes due July 2030 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate of notes | 3.90% | 3.90% |  |
Gross debt | $ 690 |  | 0 |
6.125% notes due October 2035 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate of notes | 6.125% | 6.125% |  |
Gross debt | $ 764 |  | 779 |
6.0% notes due August 2040 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate of notes | 6.00% | 6.00% |  |
Gross debt | $ 622 |  | 634 |
6.25% notes due July 2041 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate of notes | 6.25% | 6.25% |  |
Gross debt | $ 1,001 |  | 1,021 |
5.2% notes due March 2042 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate of notes | 5.20% | 5.20% |  |
Gross debt | $ 502 |  | 512 |
5.4% notes due February 2043 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate of notes | 5.40% | 5.40% |  |
Gross debt | $ 475 |  | 484 |
Notes issued |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 4,383 |  | 4,133 |
Quebrada Blanca Phase 2 project facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 1,423 | $ 1,150 | 0 |
Revolving credit facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 334 | 262 | 0 |
Antamina credit facilities (e) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 115 |  | 29 |
Face Value |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 4,977 |  | $ 3,232
Less current portion of debt |  | (90) |  | (23)
Borrowings |  | 4,887 |  | 3,209
Face Value | 4.5% notes due January 2021 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 0 |  | 117
Face Value | 4.75% notes due January 2022 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 150 |  | 202
Face Value | 3.75% notes due February 2023 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 108 |  | 220
Face Value | 3.9% notes due July 2030 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 550 |  | 0
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 |  | 3,209
Face Value | Quebrada Blanca Phase 2 project facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 1,147 |  | 0
Face Value | Revolving credit facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 262 |  | 0
Face Value | Antamina credit facilities (e) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | $ 90 |  | $ 23
Fair Value |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 7,291 |  | 4,643 |
Less current portion of debt | (115) |  | (29) |
Borrowings | 7,176 |  | 4,614 |
Fair Value | 4.5% notes due January 2021 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 0 |  | 155 |
Fair Value | 4.75% notes due January 2022 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 195 |  | 273 |
Fair Value | 3.75% notes due February 2023 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 144 |  | 298 |
Fair Value | 3.9% notes due July 2030 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 781 |  | 0 |
Fair Value | 6.125% notes due October 2035 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 1,005 |  | 932 |
Fair Value | 6.0% notes due August 2040 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 782 |  | 712 |
Fair Value | 6.25% notes due July 2041 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 1,309 |  | 1,187 |
Fair Value | 5.2% notes due March 2042 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 596 |  | 537 |
Fair Value | 5.4% notes due February 2043 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 571 |  | 520 |
Fair Value | Notes issued |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 5,383 |  | 4,614 |
Fair Value | Quebrada Blanca Phase 2 project facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 1,459 |  | 0 |
Fair Value | Revolving credit facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 334 |  | 0 |
Fair Value | Antamina credit facilities (e) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | $ 115 |  | $ 29 |

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