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Derivatives and hedge accounting - Gross carrying value of derivatives used for cash flow hedge accounting (Details) - - Derivatives - Cash flow hedges - Net payer and receiver swap - EUR (€) € in Millions	Dec. 31, 2024	Dec. 31, 2023
– Interest rate swaps
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument, assets	€ 10,635	€ 11,839
Hedging instrument, liabilities	12,814	14,051
– Cross currency swaps
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument, assets	472	324
Hedging instrument, liabilities	339	39
– Cross currency interest rate swaps
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument, assets		57
Hedging instrument, liabilities	€ 10

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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

No definition available.

+ Details

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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
-Name IFRS
-Number 7
-IssueDate 2024-01-01
-Paragraph 24A
-Subparagraph a
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-URIDate 2024-03-27

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2024-01-01
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-URIDate 2024-03-27

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