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Fair value of assets and liabilities - Summary of valuation adjustment (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |  |
Total Valuation Adjustments | € 1,806 | € (6,002) | € (1,321)
Deferred Day One Profit or Loss |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |  |
Total Valuation Adjustments | (90) | (108) |
Own credit adjustments |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |  |
Total Valuation Adjustments | 34 | 75 |
Bid/Offer |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |  |
Total Valuation Adjustments | (154) | (216) |
Model Risk |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |  |
Total Valuation Adjustments | (26) | (13) |
CVA |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |  |
Total Valuation Adjustments | (131) | (192) |
DVA |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |  |
Total Valuation Adjustments | 55 | 99 |
CollVA |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |  |
Total Valuation Adjustments | (4) | (8) |
FVA |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |  |
Total Valuation Adjustments | (68) | (78) |
Total Valuation Adjustments |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |  |
Total Valuation Adjustments | € (385) | € (441) |

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- Definition Adjustments for fair value losses (gains) to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2023-01-01 -Paragraph 20 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2023-en-r&anchor=para_20_b&doctype=Standard -URIDate 2023-03-23 + Details
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