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Employees - Summary of Key Management Compensation (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Staff And Management Costs [Line Items] |  |  |
Salaries and short-term employee benefits | € (28) | € (42) | € (40)
Share-based benefits | (5) | (16) | (13)
Key management compensation excluding non-executive director's fee | (33) | (58) | (53)
Non-Executive Directors' fees | (2) | (2) | (2)
Key management compensation | (35) | (60) | (55)
Key management personnel of entity or parent [member] | Executive Directors [Member] |  |  |
Disclosure Of Staff And Management Costs [Line Items] |  |  |
Key management compensation | (6) | (9) | (13)
Key management personnel of entity or parent [member] | Other [Member] |  |  |
Disclosure Of Staff And Management Costs [Line Items] |  |  |
Key management compensation | € (27) | € (49) | € (40)

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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 2020-01-01 -Paragraph 17 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2020-en-r&anchor=para_17&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 17 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2020-en-r&anchor=para_17_e&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of compensation to key management personnel in the form of short-term employee 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 2020-01-01 -Paragraph 17 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2020-en-r&anchor=para_17_a&doctype=Standard -URIDate 2020-01-01 + Details
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