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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

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- Definition The fair value of financial liabilities. [Refer: At fair value [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_25&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition 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]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2023-01-01 -Paragraph 93 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2023-en-r&anchor=para_93_f&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The gains (losses) including exchange differences recognised in profit or loss on the fair value measurement of liabilities. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2023-01-01 -Paragraph 93 -Subparagraph e -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2023-en-r&anchor=para_93_e_i&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The increase in fair value measurement of liabilities resulting from issues of those liabilities. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2023-01-01 -Paragraph 93 -Subparagraph e -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2023-en-r&anchor=para_93_e_iii&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The decrease in the fair value measurement of liabilities resulting from settlements. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2023-01-01 -Paragraph 93 -Subparagraph e -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2023-en-r&anchor=para_93_e_iii&doctype=Standard -URIDate 2023-03-23 + Details
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