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Goodwill and Intangible Assets, Net - Summary of Changes in intangible Asset (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Balance at beginning of period |  | $ 2,028 | $ 2,024 | $ 2,006
Additions (disposals), net | [1] | 4 | 81 | 157
Impairment losses (note 2) |  | (194) |  | (9)
Business combinations (note 5.1) |  | 7 |  |
Reclassifications (notes 5.2 and 13) |  |  | (2) | (11)
Amortization for the period |  | (130) | (124) | (106)
Foreign currency translation effects |  | 31 | 49 | (13)
Balance at the end of period |  | 1,746 | 2,028 | 2,024
Extraction rights [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Balance at beginning of period |  | 1,590 | 1,622 |
Additions (disposals), net | [1] | (33) | (26) |
Impairment losses (note 2) |  | (181) |  |
Amortization for the period |  | (21) | (8) |
Foreign currency translation effects |  | 3 | 2 |
Balance at the end of period |  | 1,358 | 1,590 | 1,622
Industrial property and trademarks [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Balance at beginning of period |  | 24 | 24 |
Additions (disposals), net | [1] |  | (6) |
Business combinations (note 5.1) |  | 2 |  |
Amortization for the period |  | (2) | (1) |
Foreign currency translation effects |  | 0 | 7 |
Balance at the end of period |  | 24 | 24 | 24
Mining projects [member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Balance at beginning of period |  | 43 | 37 |
Additions (disposals), net | [1] |  | 5 |
Amortization for the period |  | (1) | (1) |
Foreign currency translation effects |  | 1 | 2 |
Balance at the end of period |  | 43 | 43 | 37
Others intangible assets [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Balance at beginning of period | [1] | 371 | 341 |
Additions (disposals), net | [1] | 37 | 108 |
Impairment losses (note 2) | [1] | (13) |  |
Business combinations (note 5.1) | [1] | 5 |  |
Reclassifications (notes 5.2 and 13) | [1] |  | (2) |
Amortization for the period | [1] | (106) | (114) |
Foreign currency translation effects | [1] | 27 | 38 |
Balance at the end of period | [1] | $ 321 | $ 371 | $ 341
[1] | In 2020 and 2019, “Others” includes the carrying amount of internal-use software of $213 and $253, respectively. Capitalized direct costs incurred in the development stage of internal-use software, such as professional fees, direct labor and related travel expenses amounted to $40 in 2020, $102 in 2019 and $133 in 2018.

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- Definition The increase in intangible assets other than goodwill resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2020-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118_e_i&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of amortisation of intangible assets other than goodwill. [Refer: Depreciation and amortisation expense; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2020-01-01 -Paragraph 118 -Subparagraph e -Clause vi -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118_e_vi&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in intangible assets other than goodwill. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2020-01-01 -Paragraph 118 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118_e&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of impairment loss recognised in profit or loss for intangible assets other than goodwill. [Refer: Impairment loss recognised in profit or loss; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2020-01-01 -Paragraph 118 -Subparagraph e -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118_e_iv&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in intangible assets other than goodwill resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2020-01-01 -Paragraph 118 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118_e_vii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in intangible assets other than goodwill resulting from transfers and changes that the entity does not separately disclose in the same statement or note. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2020-01-01 -Paragraph 118 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118_e&doctype=Standard -URIDate 2020-01-01 + Details
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