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Debt - Summary of Detailed Information About Borrowings (Detail) CAD in Millions, $ in Millions | Dec. 31, 2017 CAD | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CAD | Dec. 31, 2016 USD ($)
--- | --- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |  |
Finance lease liabilities | CAD 313 |  | CAD 115 |
Gross debt | 6,369 |  | 8,343 |
Less current portion of debt | (55) |  | (99) |
Borrowings | 6,314 |  | 8,244 |
Antamina term loan due April 2020 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 28 |  | 30 |
Other [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 16 |  | 18 |
Notes issued [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 6,012 |  | 8,180 |
Notes issued [member] | 3.15% notes due January 2017 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  |  | 45 |
Notes issued [member] | 3.85% notes due August 2017 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  |  | 21 |
Notes issued [member] | 2.5% notes due February 2018 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 28 |  | 30 |
Notes issued [member] | 3.0% notes due March 2019 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  |  | 372 |
Notes issued [member] | 4.5% notes due January 2021 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 274 |  | 668 |
Notes issued [member] | 8.0% notes due June 2021 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  |  | 866 |
Notes issued [member] | 4.75% notes due January 2022 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 841 |  | 936 |
Notes issued [member] | 3.75% notes due February 2023 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 804 |  | 891 |
Notes issued [member] | 8.50% notes due June 2024 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 753 |  | 806 |
Notes issued [member] | 6.125% notes due October 2035 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 751 |  | 804 |
Notes issued [member] | 6.0% notes due August 2040 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 613 |  | 658 |
Notes issued [member] | 6.25% notes due July 2041 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 986 |  | 1,055 |
Notes issued [member] | 5.2% notes due March 2042 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 494 |  | 528 |
Notes issued [member] | 5.4% notes due February 2043 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 468 |  | 500 |
Face Value [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Finance lease liabilities | $ |  | $ 250 |  | $ 86
Gross debt | $ |  | 5,117 |  | 6,263
Less current portion of debt | $ |  | (45) |  | (74)
Borrowings | $ |  | 5,072 |  | 6,189
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 |  | 13
Face Value [member] | Notes issued [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | $ |  | 4,831 |  | 6,141
Face Value [member] | Notes issued [member] | 3.15% notes due January 2017 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | $ |  |  |  | 34
Face Value [member] | Notes issued [member] | 3.85% notes due August 2017 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | $ |  |  |  | 16
Face Value [member] | Notes issued [member] | 2.5% notes due February 2018 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | $ |  | 22 |  | 22
Face Value [member] | Notes issued [member] | 3.0% notes due March 2019 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | $ |  |  |  | 278
Face Value [member] | Notes issued [member] | 4.5% notes due January 2021 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | $ |  | 220 |  | 500
Face Value [member] | Notes issued [member] | 8.0% notes due June 2021 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | $ |  |  |  | 650
Face Value [member] | Notes issued [member] | 4.75% notes due January 2022 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | $ |  | 672 |  | 700
Face Value [member] | Notes issued [member] | 3.75% notes due February 2023 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | $ |  | 646 |  | 670
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 | $ |  | 491 |  | 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 | 313 |  | 115 |
Gross debt | 6,903 |  | 8,420 |
Less current portion of debt | (55) |  | (99) |
Borrowings | 6,848 |  | 8,321 |
Fair Value [member] | Antamina term loan due April 2020 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 28 |  | 30 |
Fair Value [member] | Other [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 16 |  | 18 |
Fair Value [member] | Notes issued [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 6,546 |  | 8,257 |
Fair Value [member] | Notes issued [member] | 3.15% notes due January 2017 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  |  | 45 |
Fair Value [member] | Notes issued [member] | 3.85% notes due August 2017 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  |  | 21 |
Fair Value [member] | Notes issued [member] | 2.5% notes due February 2018 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 28 |  | 30 |
Fair Value [member] | Notes issued [member] | 3.0% notes due March 2019 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  |  | 375 |
Fair Value [member] | Notes issued [member] | 4.5% notes due January 2021 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 285 |  | 685 |
Fair Value [member] | Notes issued [member] | 8.0% notes due June 2021 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt |  |  | 963 |
Fair Value [member] | Notes issued [member] | 4.75% notes due January 2022 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 884 |  | 951 |
Fair Value [member] | Notes issued [member] | 3.75% notes due February 2023 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 818 |  | 858 |
Fair Value [member] | Notes issued [member] | 8.50% notes due June 2024 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 853 |  | 935 |
Fair Value [member] | Notes issued [member] | 6.125% notes due October 2035 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 865 |  | 801 |
Fair Value [member] | Notes issued [member] | 6.0% notes due August 2040 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 686 |  | 623 |
Fair Value [member] | Notes issued [member] | 6.25% notes due July 2041 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 1,144 |  | 1,043 |
Fair Value [member] | Notes issued [member] | 5.2% notes due March 2042 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | 502 |  | 477 |
Fair Value [member] | Notes issued [member] | 5.4% notes due February 2043 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Gross debt | CAD 481 |  | CAD 450 |

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