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Subordinated loans - Schedule of subordinated loans by group companies (Details) - Subordinated loans - EUR (€)
€ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Disclosure of detailed information about borrowings [line items]    
Opening balance as at 1 January € 15,401 € 15,786
Additions 2,385 2,225
Redemptions / Disposals (1,970) (2,894)
Amortisation 11 34
Other (40) 12
Changes in unrealised revaluations (72) 473
Foreign exchange movement 217 (235)
Closing balance € 15,933 € 15,401