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Operating costs and non-underlying items - Additional Information (Detail) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Gross Profit And Operating Costs [Abstract]
Exchange gains/(losses)	€ 45	€ 41	€ 49

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- Definition

Disclosure of gross profit and operating costs [Abstract]

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No definition available.

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- Definition

Gain losses on exchange difference amounts on forward contracts and underlying transactions.

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No definition available.

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