v3.26.1
Fair value of assets and liabilities - Changes in level 3 financial liabilities (Details) - EUR (€)
€ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Financial liabilities at fair value, class    
Disclosure of fair value measurement of liabilities [line items]    
Unrealised gains on (losses) recognised in the statement of profit or loss € 99 € 158
Level 3    
Disclosure of fair value measurement of liabilities [line items]    
Opening balance as at 1 January 802 770
Realised gain/loss recognised in the statement of profit or loss during the period 99 157
Additions 285 219
Redemptions (27) (74)
Maturity/settlement (127) (225)
Reclassifications 0
Transfers into Level 3 61 38
Transfers out of Level 3 (18) (84)
Exchange rate differences 0 (1)
Closing balance 1,076 802
Level 3 | Trading liabilities    
Disclosure of fair value measurement of liabilities [line items]    
Opening balance as at 1 January 636 637
Realised gain/loss recognised in the statement of profit or loss during the period 102 81
Additions 95 205
Redemptions (15) (74)
Maturity/settlement (92) (160)
Reclassifications (116)
Transfers into Level 3 39 19
Transfers out of Level 3 (13) (72)
Exchange rate differences 0 (1)
Closing balance 866 636
Level 3 | Non-trading derivatives    
Disclosure of fair value measurement of liabilities [line items]    
Opening balance as at 1 January 151 67
Realised gain/loss recognised in the statement of profit or loss during the period (1) 82
Additions 0 3
Redemptions (2) 0
Maturity/settlement (33) 0
Reclassifications 116
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Exchange rate differences 0 0
Closing balance 0 151
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 15 67
Realised gain/loss recognised in the statement of profit or loss during the period (2) (6)
Additions 191 11
Redemptions (10) 0
Maturity/settlement (2) (64)
Reclassifications
Transfers into Level 3 22 19
Transfers out of Level 3 (5) (12)
Exchange rate differences 0 0
Closing balance € 209 € 15