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Capital and funding - Summary of Currency Retranslation Reserve (Details) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Equity and liabilities [abstract]
Currency retranslation reserve at beginning of period	€ (5,803)	€ (6,043)
Currency retranslation of group companies' net assets and liabilities during the year	(1,514)	212
Movement in net investment hedges and exchange differences in net investments in foreign operations	(115)	28
Currency retranslation reserve at end of period	€ (7,432)	€ (5,803)

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- Definition

Gain (loss) in net investment hedges and exchange differences in net investments in foreign operations.

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Reserve of currency retranslation movement.

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Reserve of currency retranslation of group companies.

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