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Fair value of assets and liabilities - Changes in level 3 financial liabilities (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Financial liabilities, class    
Disclosure of fair value measurement of liabilities [line items]    
Unrealised gains on (losses) recognised in the statement of profit or loss € 72 € (179)
Level 3    
Disclosure of fair value measurement of liabilities [line items]    
Opening balance as at 1 January 732 330
Realised gain/loss recognised in the statement of profit or loss during the period 72 179
Additions 142 153
Redemptions (156) (51)
Maturity/settlement (30) (360)
Transfers into Level 3 72 710
Transfers out of Level 3 (102) (226)
Exchange rate differences 0 (3)
Closing balance 729 732
Level 3 | Trading liabilities    
Disclosure of fair value measurement of liabilities [line items]    
Opening balance as at 1 January 229 160
Realised gain/loss recognised in the statement of profit or loss during the period 224 131
Additions 53 124
Redemptions (102) (38)
Maturity/settlement (13) (282)
Transfers into Level 3 40 254
Transfers out of Level 3 (49) (117)
Exchange rate differences 0 (3)
Closing balance 382 229
Level 3 | Non-trading derivatives    
Disclosure of fair value measurement of liabilities [line items]    
Opening balance as at 1 January 449 35
Realised gain/loss recognised in the statement of profit or loss during the period (151) 59
Additions 72 16
Redemptions (53) 0
Maturity/settlement (16) (7)
Transfers into Level 3 0 368
Transfers out of Level 3 0 (21)
Exchange rate differences 0 0
Closing balance 301 449
Level 3 | Financial liabilities designated as at fair value through profit or loss    
Disclosure of fair value measurement of liabilities [line items]    
Opening balance as at 1 January 54 135
Realised gain/loss recognised in the statement of profit or loss during the period (2) (10)
Additions 18 13
Redemptions (2) (13)
Maturity/settlement (1) (71)
Transfers into Level 3 32 88
Transfers out of Level 3 (54) (88)
Exchange rate differences 0 0
Closing balance € 47 € 54