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Average number of employees - Summary of average number of employees (Parenthetical) (Detail) - Employee | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of average number of employees [Line Items] |  |  |
Average number of employees | 46,007 | 47,458 | 46,807
Singapore [Member] |  |  |
Disclosure of average number of employees [Line Items] |  |  |
Average number of employees | 430 | 422 | 434
India [Member] |  |  |
Disclosure of average number of employees [Line Items] |  |  |
Average number of employees | 272 | 288 | 310

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- Definition The average number of personnel employed by the entity during a period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Disclosure of average number of employees.. + References No definition available. + Details
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- Details
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- Details
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