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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, 2017 EUR (€) Employees | Dec. 31, 2016 EUR (€) Employees | Dec. 31, 2015 EUR (€) Employees
Disclosure Of Staff And Management Costs [Line Items] |  |  |
Wages and salaries | € (5,416) | € (5,347) | € (5,474)
Social security costs | (613) | (606) | (606)
Other pension costs | (399) | (372) | (325)
Share-based compensation costs | (284) | (198) | (150)
Gross staff costs | € (6,712) | € (6,523) | € (6,555)
Average number of employees during the year | Employees | 165 | 169 | 171
Salaries and short-term employee benefits | € (34) | € (31) | € (34)
Post-employment benefits | 0 | (1) | (1)
Share-based benefits | (20) | (17) | (30)
Key management compensation excluding no- executive director's fee | (54) | (49) | (65)
Key management compensation | (56) | (51) | (67)
Key management personnel of entity or parent [member] | Executive directors [member] |  |  |
Disclosure Of Staff And Management Costs [Line Items] |  |  |
Key management compensation | (14) | (13) | (18)
Key management personnel of entity or parent [member] | Other [member] |  |  |
Disclosure Of Staff And Management Costs [Line Items] |  |  |
Key management compensation | (40) | (36) | (47)
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 | 93 | 95 | 97
The Americas [member] |  |  |
Disclosure Of Staff And Management Costs [Line Items] |  |  |
Average number of employees during the year | Employees | 41 | 42 | 42
Europe [member] |  |  |
Disclosure Of Staff And Management Costs [Line Items] |  |  |
Average number of employees during the year | Employees | 31 | 32 | 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 2016-01-13 -Paragraph 102 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_102&doctype=Standard -URIDate 2016-03-31 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_99&doctype=Standard -URIDate 2016-03-31 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 104 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_104&doctype=Standard -URIDate 2016-03-31 + 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 2016-01-13 -Paragraph 17 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2016-03-30&anchor=para_17&doctype=Standard -URIDate 2016-03-31 + Details
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