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Debt - Summary of Detailed Information About Borrowings (Detail) $ in Millions, $ in Millions | Dec. 31, 2018 CAD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2017 USD ($) | Jan. 01, 2017 CAD ($)
--- | --- | --- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Finance lease liabilities | $ 338 |  | $ 313 |  |
Gross debt | 5,519 |  | 6,369 |  |
Less current portion of debt | (32) |  | (55) |  |
Borrowings | 5,487 |  | 6,314 |  | $ 8,244
Antamina term loan due April 2020 [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Gross debt | 31 |  | 28 |  |
Other [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Gross debt |  |  | 16 |  |
Notes issued [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Gross debt | 5,150 |  | 6,012 |  |
Notes issued [member] | 2.5% notes due February 2018 [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Gross debt |  |  | 28 |  |
Notes issued [member] | 4.5% notes due January 2021 [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Gross debt | 159 |  | 274 |  |
Notes issued [member] | 4.75% notes due January 2022 [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Gross debt | 275 |  | 841 |  |
Notes issued [member] | 3.75% notes due February 2023 [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Gross debt | 295 |  | 804 |  |
Notes issued [member] | 8.50% notes due June 2024 [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Gross debt | 819 |  | 753 |  |
Notes issued [member] | 6.125% notes due October 2035 [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Gross debt | 818 |  | 751 |  |
Notes issued [member] | 6.0% notes due August 2040 [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Gross debt | 666 |  | 613 |  |
Notes issued [member] | 6.25% notes due July 2041 [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Gross debt | 1,072 |  | 986 |  |
Notes issued [member] | 5.2% notes due March 2042 [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Gross debt | 537 |  | 494 |  |
Notes issued [member] | 5.4% notes due February 2043 [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Gross debt | 509 |  | 468 |  |
Face Value [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Finance lease liabilities |  | $ 248 |  | $ 250 |
Gross debt |  | 4,080 |  | 5,117 |
Less current portion of debt |  | (24) |  | (45) |
Borrowings |  | 4,056 |  | 5,072 |
Face Value [member] | Antamina term loan due April 2020 [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Gross debt |  | 23 |  | 23 |
Face Value [member] | Other [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Gross debt |  |  |  | 13 |
Face Value [member] | Notes issued [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Gross debt |  | 3,809 |  | 4,831 |
Face Value [member] | Notes issued [member] | 2.5% notes due February 2018 [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Gross debt |  |  |  | 22 |
Face Value [member] | Notes issued [member] | 4.5% notes due January 2021 [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Gross debt |  | 117 |  | 220 |
Face Value [member] | Notes issued [member] | 4.75% notes due January 2022 [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Gross debt |  | 202 |  | 672 |
Face Value [member] | Notes issued [member] | 3.75% notes due February 2023 [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Gross debt |  | 220 |  | 646 |
Face Value [member] | Notes issued [member] | 8.50% notes due June 2024 [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Gross debt |  | 600 |  | 600 |
Face Value [member] | Notes issued [member] | 6.125% notes due October 2035 [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Gross debt |  | 609 |  | 609 |
Face Value [member] | Notes issued [member] | 6.0% notes due August 2040 [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Gross debt |  | 490 |  | 491 |
Face Value [member] | Notes issued [member] | 6.25% notes due July 2041 [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Gross debt |  | 795 |  | 795 |
Face Value [member] | Notes issued [member] | 5.2% notes due March 2042 [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Gross debt |  | 399 |  | 399 |
Face Value [member] | Notes issued [member] | 5.4% notes due February 2043 [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Gross debt |  | $ 377 |  | $ 377 |
Fair Value [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Finance lease liabilities | 338 |  | 313 |  |
Gross debt | 5,340 |  | 6,903 |  |
Less current portion of debt | (32) |  | (55) |  |
Borrowings | 5,308 |  | 6,848 |  |
Fair Value [member] | Antamina term loan due April 2020 [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Gross debt | 31 |  | 28 |  |
Fair Value [member] | Other [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Gross debt |  |  | 16 |  |
Fair Value [member] | Notes issued [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Gross debt | 4,971 |  | 6,546 |  |
Fair Value [member] | Notes issued [member] | 2.5% notes due February 2018 [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Gross debt |  |  | 28 |  |
Fair Value [member] | Notes issued [member] | 4.5% notes due January 2021 [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Gross debt | 159 |  | 285 |  |
Fair Value [member] | Notes issued [member] | 4.75% notes due January 2022 [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Gross debt | 275 |  | 884 |  |
Fair Value [member] | Notes issued [member] | 3.75% notes due February 2023 [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Gross debt | 286 |  | 818 |  |
Fair Value [member] | Notes issued [member] | 8.50% notes due June 2024 [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Gross debt | 883 |  | 853 |  |
Fair Value [member] | Notes issued [member] | 6.125% notes due October 2035 [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Gross debt | 802 |  | 865 |  |
Fair Value [member] | Notes issued [member] | 6.0% notes due August 2040 [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Gross debt | 621 |  | 686 |  |
Fair Value [member] | Notes issued [member] | 6.25% notes due July 2041 [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Gross debt | 1,031 |  | 1,144 |  |
Fair Value [member] | Notes issued [member] | 5.2% notes due March 2042 [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Gross debt | 465 |  | 502 |  |
Fair Value [member] | Notes issued [member] | 5.4% notes due February 2043 [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Gross debt | $ 449 |  | $ 481 |  |

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