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Earnings per share - Additional Information (Detail) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings per share [line items]
Shares excluded from the computation of diluted earnings per share	19,300,000	16,900,000	8,200,000
Treasury shares [member]
Earnings per share [line items]
Ordinary shares in issue	70,787,730	70,854,553	62,578,938
Ordinary shares [member]
Earnings per share [line items]
Ordinary shares in issue	1,328,167,813	1,332,678,227	1,332,511,552

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- 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

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- Definition

The number of shares issued by the entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 106
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_106_d&doctype=Standard
-URIDate 2019-03-27

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- Definition

Shares excluded from computation of diluted earnings per share.

+ References

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