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Operating costs - Narrative (Details) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Analysis of income and expense [abstract]
Exchange losses	€ (249)	€ (225)	€ 0

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- Definition

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

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