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Employees - Summary of Key Management Compensation (Detail) - EUR (€) € in Millions	12 Months Ended
	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]]

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