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Capital and funding - Summary of Treasury Shares Movements (Details) - EUR (€) € in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021
Equity and liabilities [abstract]
Treasury shares at beginning of period		€ (3,406)	€ (483)
Repurchase of shares	[1]	(1,509)	(3,018)
Other purchases and utilisations		106	95
Treasury shares at end of period		€ (4,809)	€ (3,406)
[1] Repurchase of shares reflects the cost of acquiring ordinary shares as part of the share buyback programme announced on 29 April 2021 and 10 February 2022.

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The increase (decrease) in equity resulting from treasury share transactions. [Refer: Equity; Treasury shares]

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An entity’s own equity instruments, held by the entity or other members of the consolidated group.

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