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v3.20.4

Debt - Additional Information (Detail) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) creditFacility payment | Dec. 31, 2020 CAD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2020 CAD ($) creditFacility payment | Dec. 31, 2019 CAD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount |  |  |  |  | $ 6,255,000,000 | $ 4,162,000,000
Proceeds from debt | $ 2,426,000,000 |  | $ 0 |  |  |
Repayments of bonds, notes and debentures | 268,000,000 | $ 457,000,000 |  | $ 835,000,000 |  |
Repayments of borrowings including purchase premiums, classified as financing activities | $ 276,000,000 |  |  |  |  |
Number of credit facilities | creditFacility | 2 |  |  |  | 2 |
Debt-to-capitalization ratio, maximum | 0.6 |  |  |  | 0.6 |
Repayments of bonds, notes and debentures | $ 268,000,000 | $ 457,000,000 |  | $ 835,000,000 |  |
Non-operating income (expense) |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Repayments of bonds, notes and debentures | 11,000,000 |  |  |  |  |
Repayments of bonds, notes and debentures | $ 11,000,000 |  |  |  |  |
Top of range |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Debt-to-capitalization ratio, actual | 0.24 |  |  |  | 0.24 |
Debt-to-capitalization ratio, maximum | 0.60 |  |  |  | 0.60 |
8.5% notes due June 2024 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount |  |  | $ 600,000,000 |  |  |
Borrowings, interest rate |  |  | 8.50% |  |  | 8.50%
Repayments of bonds, notes and debentures |  |  | $ 638,000,000 |  |  |
Non-operating income (expense) |  |  | 224,000,000 |  |  |
Embedded prepayment option derivative |  |  | 174,000,000 |  |  |
Repayments of bonds, notes and debentures |  |  | $ 638,000,000 |  |  |
4.5% notes due January 2021 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount |  |  |  |  | $ 0 | $ 152,000,000
Borrowings, interest rate | 4.50% |  |  |  | 4.50% |
Repayments of bonds, notes and debentures | $ 104,000,000 |  |  |  |  |
Repayments of bonds, notes and debentures | $ 104,000,000 |  |  |  |  |
4.75% notes due January 2022 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount |  |  |  |  | $ 190,000,000 | 262,000,000
Borrowings, interest rate | 4.75% |  |  |  | 4.75% |
Repayments of bonds, notes and debentures | $ 52,000,000 |  |  |  |  |
Repayments of bonds, notes and debentures | $ 52,000,000 |  |  |  |  |
3.75% notes due February 2023 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount |  |  |  |  | $ 139,000,000 | 289,000,000
Borrowings, interest rate | 3.75% |  |  |  | 3.75% |
Repayments of bonds, notes and debentures | $ 112,000,000 |  |  |  |  |
Repayments of bonds, notes and debentures | 112,000,000 |  |  |  |  |
3.9% notes due July 2030 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount | $ 550,000,000 |  |  |  |  |
Borrowings, interest rate | 3.90% |  |  |  | 3.90% |
Borrowings, effective interest rate | 4.08% |  |  |  | 4.08% |
Issued at percent of face value | 99.513% |  |  |  | 99.513% |
Redemption price | 100.00% |  |  |  | 100.00% |
Proceeds from debt | $ 542,000,000 |  |  |  |  |
Revolving credit facility |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount | 262,000,000 |  |  |  | $ 334,000,000 | 0
Undrawn borrowing facilities | 4,000,000,000.0 |  |  |  |  |
Antamina credit facilities |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount | $ 90,000,000 |  |  |  |  |
Number of credit facilities | creditFacility | 3 |  |  |  | 3 |
Quebrada Blanca Phase 2 project facility |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount | $ 1,150,000,000 |  |  |  | $ 1,423,000,000 | $ 0
Face amount of debt | $ 2,500,000,000 |  |  |  |  |
Number of semi-annual payments | payment | 17 |  |  |  | 17 |
$1B revolving facility |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Undrawn borrowing facilities | $ 1,000,000,000.0 |  |  |  |  |
Outstanding notes, except for notes due October 2035 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Redemption price | 100.00% |  |  |  | 100.00% |
Surety Bond |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Principal amount |  |  |  |  | $ 840,000,000 |
Uncommitted credit facilities |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | 1,900,000,000 |
Outstanding letters of credit |  |  |  |  | 1,600,000,000 |
Stand alone credit facility |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Outstanding letters of credit |  |  |  |  | $ 459,000,000 |
2020 Tender Offer |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Repayments of bonds, notes and debentures | $ 13,000,000 |  |  |  |  |
Repayments of bonds, notes and debentures | $ 13,000,000 |  |  |  |  |
Antamina |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Ownership interest in joint operation | 22.50% | 22.50% |  |  |  |

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