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Fair value of assets and liabilities - Deferred day one profit or loss reserve (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of fair value measurement of assets and liabilities [Line Items]    
Opening balance at 1 January € (108) € (7)
DOP deferred on new transactions during the period (83) (107)
Closing balance at 31 December (90) (108)
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 85 6
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 € 15 € 0