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Employees - Summary of Staff Cost, Average Number of Employees and Key Management Compensation (Detail) Employees in Thousands, € in Millions | 12 Months Ended
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Dec. 31, 2018 EUR (€) Employees | Dec. 31, 2017 EUR (€) Employees | Dec. 31, 2016 EUR (€) Employees
Disclosure Of Staff And Management Costs [Line Items] |  |  |
Wages and salaries | € (5,346) | € (5,416) | € (5,347)
Social security costs | (571) | (613) | (606)
Other pension costs | (439) | (399) | (372)
Share-based compensation costs | (196) | (284) | (198)
Gross staff costs | € (6,552) | € (6,712) | € (6,523)
Average number of employees during the year | Employees | 158 | 165 | 169
Salaries and short-term employee benefits | € (40) | € (34) | € (31)
Post-employment benefits |  |  | (1)
Share-based benefits | (19) | (20) | (17)
Key management compensation excluding non-executive director's fee | (59) | (54) | (49)
Key management compensation | (61) | (56) | (51)
Key management personnel of entity or parent [member] | Executive Directors [Member] |  |  |
Disclosure Of Staff And Management Costs [Line Items] |  |  |
Key management compensation | (15) | (14) | (13)
Key management personnel of entity or parent [member] | Other [Member] |  |  |
Disclosure Of Staff And Management Costs [Line Items] |  |  |
Key management compensation | (44) | (40) | (36)
Key management personnel of entity or parent [member] | Non-Executive Directors [Member] |  |  |
Disclosure Of Staff And Management Costs [Line Items] |  |  |
Key management compensation | € (2) | € (2) | € (2)
Asia/AMET/RUB [member] |  |  |
Disclosure Of Staff And Management Costs [Line Items] |  |  |
Average number of employees during the year | Employees | 88 | 93 | 95
The Americas [member] |  |  |
Disclosure Of Staff And Management Costs [Line Items] |  |  |
Average number of employees during the year | Employees | 40 | 41 | 42
Europe [member] |  |  |
Disclosure Of Staff And Management Costs [Line Items] |  |  |
Average number of employees during the year | Employees | 30 | 31 | 32

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- Definition The expense of all forms of consideration given by an entity in exchange for a service rendered by employees or for the termination of employment. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 102 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_102&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_99&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 104 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_104&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of expense from share-based payment transactions with employees. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of compensation to key management personnel. [Refer: Key management personnel of entity or parent [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2017-01-01 -Paragraph 17 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2017-03-01&anchor=para_17&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of compensation to key management personnel in the form of post-employment benefits. [Refer: Key management personnel of entity or parent [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2017-01-01 -Paragraph 17 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2017-03-01&anchor=para_17_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of compensation to key management personnel in the form of share-based payments. [Refer: Key management personnel of entity or parent [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2017-01-01 -Paragraph 17 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2017-03-01&anchor=para_17_e&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition A class of employee benefits expense that represents social security contributions. [Refer: Employee benefits expense] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 9 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_9&doctype=Standard -URIDate 2017-03-09 + Details
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