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Our people - Geographical Distribution of staff (Detail) - Employees	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of geographical areas [line items]
Average number of staff	133,903	134,428	132,657
North America [member]
Disclosure of geographical areas [line items]
Average number of staff	25,990	27,399	27,246
United Kingdom [member]
Disclosure of geographical areas [line items]
Average number of staff	14,331	14,197	14,070
Western Continental Europe [member]
Disclosure of geographical areas [line items]
Average number of staff	26,825	25,700	24,996
Asia Pacific, Latin America, Africa & Middle East and Central & Eastern Europe [member]
Disclosure of geographical areas [line items]
Average number of staff	66,757	67,132	66,345

X

- 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
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-IssueDate 2018-01-01
-Paragraph 112
-Subparagraph c
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-URIDate 2018-03-16

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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

No definition available.

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