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Fair value of assets and liabilities - Deferred day one profit or loss reserve (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Opening balance at 1 January | € (90) | € (108)
DOP deferred on new transactions during the period | (62) | (83)
Closing balance at 31 December | (94) | (90)
of which release |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
DOP recognised in the statement of profit or loss during the period | 27 | 85
of which amortisation and exchange differences |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
DOP recognised in the statement of profit or loss during the period | € 32 | € 15

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- Details
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