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Earnings per share - Additional Information (Detail) - shares | 12 Months Ended
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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 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 + Details
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- Details
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