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Fair value of assets and liabilities - Changes in level 3 financial liabilities (Details) - EUR (€) € in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Financial liabilities, class
Disclosure of fair value measurement of liabilities [line items]
Unrealised gains on (losses) recognised in the statement of profit or loss	€ 185	€ (72)
Level 3
Disclosure of fair value measurement of liabilities [line items]
Opening balance as at 1 January	729	732
Realised gain/loss recognised in the statement of profit or loss during the period	(185)	72
Additions	138	142
Redemptions	(56)	(156)
Maturity/settlement	(21)	(30)
Transfers into Level 3	8	72
Transfers out of Level 3	(49)	(102)
Exchange rate differences	0	0
Closing balance	564	729
Level 3 | Trading liabilities
Disclosure of fair value measurement of liabilities [line items]
Opening balance as at 1 January	382	229
Realised gain/loss recognised in the statement of profit or loss during the period	(129)	224
Additions	28	53
Redemptions	(4)	(102)
Maturity/settlement	(10)	(13)
Transfers into Level 3	6	40
Transfers out of Level 3	(19)	(49)
Closing balance	253	382
Level 3 | Non-trading derivatives
Disclosure of fair value measurement of liabilities [line items]
Opening balance as at 1 January	301	449
Realised gain/loss recognised in the statement of profit or loss during the period	(57)	(151)
Additions	110	72
Redemptions	(52)	(53)
Maturity/settlement	(7)	(16)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Exchange rate differences	0	0
Closing balance	296	301
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	47	54
Realised gain/loss recognised in the statement of profit or loss during the period	0	(2)
Additions	0	18
Redemptions	0	(2)
Maturity/settlement	(4)	(1)
Transfers into Level 3	2	32
Transfers out of Level 3	(30)	(54)
Exchange rate differences	0	0
Closing balance	16	47
Level 3 | Liabilities Held For Trading
Disclosure of fair value measurement of liabilities [line items]
Exchange rate differences	€ 0	€ 0

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The fair value of financial liabilities. [Refer: At fair value [member]; Financial liabilities]

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The gains (losses) recognised in profit or loss for assets measured at fair value that are attributable to the change in unrealised gains or losses relating to those assets held at the end of the reporting period. [Refer: At fair value [member]]

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