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Fair value of assets and liabilities - Summary of valuation adjustment (Details) - EUR (€) € in Millions | 6 Months Ended | 12 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |  |
Total Valuation Adjustments | € 613 | € (80) |
Deferred Day One Profit or Loss |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |  |
Total Valuation Adjustments | (93) |  | € (94)
Own credit adjustments |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |  |
Total Valuation Adjustments | (24) |  | (17)
Bid/Offer |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |  |
Total Valuation Adjustments | (150) |  | (130)
Model Risk |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |  |
Total Valuation Adjustments | (49) |  | (33)
CVA |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |  |
Total Valuation Adjustments | (138) |  | (123)
DVA |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |  |
Total Valuation Adjustments | 42 |  | 50
CollVA |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |  |
Total Valuation Adjustments | (2) |  | (3)
FVA |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |  |
Total Valuation Adjustments | (98) |  | (64)
Other valuation adjustments |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |  |
Total Valuation Adjustments | 2 |  | 2
Total Valuation Adjustments |  |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |  |
Total Valuation Adjustments | € (511) |  | € (412)

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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 2024-01-01 -Paragraph 20 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_20_b&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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