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Debt - Summary of Detailed Information About Borrowings (Detail) $ in Millions, $ in Millions | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 CAD ($)
--- | --- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | $ 4,162 |  | $ 5,181
Less current portion of debt |  | (29) |  | 0
Borrowings |  | $ 4,133 |  | 5,181
4.5% notes due January 2021 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate of notes | 4.50% | 4.50% |  |
Gross debt |  | $ 152 |  | 159
4.75% notes due January 2022 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate of notes | 4.75% | 4.75% |  |
Gross debt |  | $ 262 |  | 275
3.75% notes due February 2023 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate of notes | 3.75% | 3.75% |  |
Gross debt |  | $ 289 |  | 295
8.5% notes due June 2024 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate of notes | 8.50% | 8.50% |  |
Gross debt | $ 600 | $ 0 |  | 819
6.125% notes due October 2035 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate of notes | 6.125% | 6.125% |  |
Gross debt |  | $ 779 |  | 818
6.0% notes due August 2040 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate of notes | 6.00% | 6.00% |  |
Gross debt |  | $ 634 |  | 666
6.25% notes due July 2041 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate of notes | 6.25% | 6.25% |  |
Gross debt |  | $ 1,021 |  | 1,072
5.2% notes due March 2042 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate of notes | 5.20% | 5.20% |  |
Gross debt |  | $ 512 |  | 537
5.4% notes due February 2043 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest rate of notes | 5.40% | 5.40% |  |
Gross debt |  | $ 484 |  | 509
Notes issued |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 4,133 |  | 5,150
Antamina term loan due April 2020 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 29 |  | 31
Face Value |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | $ 3,232 |  | $ 3,832 |
Less current portion of debt | (23) |  | 0 |
Borrowings | 3,209 |  | 3,832 |
Face Value | 4.5% notes due January 2021 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 117 |  | 117 |
Face Value | 4.75% notes due January 2022 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 202 |  | 202 |
Face Value | 3.75% notes due February 2023 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 220 |  | 220 |
Face Value | 8.5% notes due June 2024 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 0 |  | 600 |
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 | 3,209 |  | 3,809 |
Face Value | Antamina term loan due April 2020 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | $ 23 |  | $ 23 |
Fair Value |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 4,643 |  | 5,002
Less current portion of debt |  | (29) |  | 0
Borrowings |  | 4,614 |  | 5,002
Fair Value | 4.5% notes due January 2021 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 155 |  | 159
Fair Value | 4.75% notes due January 2022 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 273 |  | 275
Fair Value | 3.75% notes due February 2023 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 298 |  | 286
Fair Value | 8.5% notes due June 2024 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 0 |  | 883
Fair Value | 6.125% notes due October 2035 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 932 |  | 802
Fair Value | 6.0% notes due August 2040 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 712 |  | 621
Fair Value | 6.25% notes due July 2041 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 1,187 |  | 1,031
Fair Value | 5.2% notes due March 2042 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 537 |  | 465
Fair Value | 5.4% notes due February 2043 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 520 |  | 449
Fair Value | Notes issued |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | 4,614 |  | 4,971
Fair Value | Antamina term loan due April 2020 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  | $ 29 |  | $ 31

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