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Employees - Summary of Staff Cost, Average and Number of Employees (Detail) Employees in Thousands, € in Millions | 12 Months Ended
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Dec. 31, 2020 EUR (€) Employees | Dec. 31, 2019 EUR (€) Employees | Dec. 31, 2018 EUR (€) Employees
Disclosure Of Staff And Management Costs [Line Items] |  |  |
Wages and salaries | € (5,051) | € (5,364) | € (5,346)
Social security costs | (519) | (541) | (571)
Other pension costs | (419) | (334) | (439)
Share-based compensation costs | (108) | (151) | (196)
Gross staff costs | € (6,097) | € (6,390) | € (6,552)
Average number of employees during the year | Employees | 150 | 153 | 158
Asia/AMET/RUB [member] |  |  |
Disclosure Of Staff And Management Costs [Line Items] |  |  |
Average number of employees during the year | Employees | 83 | 84 | 88
The Americas [member] |  |  |
Disclosure Of Staff And Management Costs [Line Items] |  |  |
Average number of employees during the year | Employees | 38 | 40 | 40
Europe [member] |  |  |
Disclosure Of Staff And Management Costs [Line Items] |  |  |
Average number of employees during the year | Employees | 29 | 29 | 30

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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 2020-01-01 -Paragraph 102 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_102&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_99&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 104 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_104&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 9 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_9&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition A class of employee benefits expense that represents wages and salaries. [Refer: Employee benefits expense] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 9 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_9&doctype=Standard -URIDate 2020-01-01 + Details
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