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Derivatives and hedge accounting - Gross carrying value of derivatives designated under fair value hedge accounting (Details) - - Derivatives - -  fair value hedges - EUR (€) € in Millions	Dec. 31, 2024	Dec. 31, 2023
Interest rate risk | – Interest rate swaps
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument, assets	€ 3,080	€ 3,011
Hedging instrument, liabilities	5,673	6,410
Interest rate risk | – Other interest derivatives
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument, assets	207	284
Hedging instrument, liabilities	23	€ 34
Foreign exchange | – Cross currency swaps
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument, assets	12
Hedging instrument, liabilities	€ 3

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

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- Definition

The amount of a hedging instrument, recognised as an asset. [Refer: Hedging instruments [domain]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 7
-IssueDate 2024-01-01
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- Definition

The amount of a hedging instrument, recognised as a liability. [Refer: Hedging instruments [domain]]

+ References

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