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Debt - Summary of Detailed Information About Borrowings (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
3.15% notes due January 2017 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate of notes |  | 3.15%
3.15% notes due January 2017 [member] | Notes issued [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate of notes |  | 3.15%
Maturity date |  | January 2017
3.85% notes due August 2017 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate of notes |  | 3.85%
3.85% notes due August 2017 [member] | Notes issued [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate of notes |  | 3.85%
Maturity date |  | August 2017
2.5% notes due February 2018 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate of notes |  | 2.50%
2.5% notes due February 2018 [member] | Notes issued [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate of notes | 2.50% | 2.50%
Maturity date | February 2018 | February 2018
3.0% notes due March 2019 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate of notes | 3.00% | 3.00%
3.0% notes due March 2019 [member] | Notes issued [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate of notes |  | 3.00%
Maturity date |  | March 2019
4.5% notes due January 2021 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate of notes | 4.50% |
4.5% notes due January 2021 [member] | Notes issued [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate of notes | 4.50% | 4.50%
Maturity date | January 2021 | January 2021
8.0% notes due June 2021 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate of notes | 8.00% |
Maturity date | June 2021 |
8.0% notes due June 2021 [member] | Notes issued [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate of notes |  | 8.00%
Maturity date |  | June 2021
4.75% notes due January 2022 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate of notes | 4.75% |
4.75% notes due January 2022 [member] | Notes issued [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate of notes | 4.75% | 4.75%
Maturity date | January 2022 | January 2022
3.75% notes due February 2023 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate of notes | 3.75% | 3.75%
3.75% notes due February 2023 [member] | Notes issued [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate of notes | 3.75% | 3.75%
Maturity date | February 2023 | February 2023
8.50% notes due June 2024 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate of notes | 8.50% |
8.50% notes due June 2024 [member] | Notes issued [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate of notes | 8.50% | 8.50%
Maturity date | June 2024 | June 2024
6.125% notes due October 2035 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate of notes |  | 6.125%
6.125% notes due October 2035 [member] | Notes issued [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate of notes | 6.125% | 6.125%
Maturity date | October 2035 | October 2035
6.0% notes due August 2040 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate of notes |  | 6.00%
6.0% notes due August 2040 [member] | Notes issued [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate of notes | 6.00% | 6.00%
Maturity date | August 2040 | August 2040
6.25% notes due July 2041 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate of notes |  | 6.25%
6.25% notes due July 2041 [member] | Notes issued [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate of notes | 6.25% | 6.25%
Maturity date | July 2041 | July 2041
5.2% notes due March 2042 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate of notes |  | 5.20%
5.2% notes due March 2042 [member] | Notes issued [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate of notes | 5.20% | 5.20%
Maturity date | March 2042 | March 2042
5.4% notes due February 2043 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate of notes |  | 5.40%
5.4% notes due February 2043 [member] | Notes issued [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate of notes | 5.40% | 5.40%
Maturity date | February 2043 | February 2043
Antamina term loan due April 2020 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Maturity date | April 2020 | April 2020

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- Definition The interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_7&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The maturity of borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_7&doctype=Standard -URIDate 2017-03-09 + Details
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