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Business combinations - Acquisition of BE-Terna Narrative (Details) - BE-terna - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2023	Jun. 09, 2022
Disclosure of detailed information about business combination [line items]
Loss of acquiree since acquisition date	€ (3)
Percentage of voting equity interests acquired		100.00%
Consideration		€ 191
Payment obligations cancelled		€ 162
Increase (decrease) in goodwill	€ 3

X

- Definition

The fair value, at acquisition date, of the consideration transferred in a business combination. [Refer: Total for all business combinations [member]]

+ References

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- Definition

The increase (decrease) in goodwill. [Refer: Goodwill]

+ References

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- Definition

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- Definition

The percentage of voting equity interests acquired in a business combination. [Refer: Total for all business combinations [member]]

+ References

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The profit (loss) of the acquiree, since the acquisition date, included in the consolidated statement of comprehensive income. [Refer: Profit (loss)]

+ References

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