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Intangible assets - Additional information (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Exploration and evaluation assets
Disclosure of detailed information about intangible assets [Line Items]
Capitalised related to projects which had not yet been approved to proceed	$ 271	$ 173

X

- Definition

The amount of expenditure capitalised during the construction of non-current assets that are not yet available for use. [Refer: Non-current assets]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 16
-IssueDate 2020-01-01
-Paragraph 37
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_37&doctype=Standard
-URIDate 2020-01-01

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
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Period Type:	duration

X

- Details

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Namespace Prefix:
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