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Fair value of assets and liabilities - Methods applied in determining fair values of financial assets and liabilities (carried at fair value) (Detail) - EUR (€) € in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | € 137,580 | € 123,015
Financial assets at fair value through other comprehensive income | 46,389 | 41,116
Financial liabilities at fair value through profit or loss | 86,900 | 94,638
– Debt securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 9,966 | 8,770
– Deposits |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 45,014 | 57,076
– Trading securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 3,653 | 3,645
- Derivatives |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 28,267 | 25,148
Loans and receivables |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 68,782 | 67,446
Financial assets at fair value through other comprehensive income | 1,608 | 951
- Equity securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 20,945 | 15,590
Financial assets at fair value through other comprehensive income | 2,562 | 1,885
- Debt securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 15,586 | 12,270
- Debt securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through other comprehensive income | 42,219 | 38,281
- Derivatives |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 32,268 | 27,708
Level 1 |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 28,275 | 20,302
Financial assets at fair value through other comprehensive income | 42,151 | 37,470
Financial liabilities at fair value through profit or loss | 5,131 | 4,733
Level 1 | – Debt securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 1,455 | 1,088
Level 1 | – Deposits |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 0 | 0
Level 1 | – Trading securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 3,631 | 3,604
Level 1 | - Derivatives |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 45 | 41
Level 1 | Loans and receivables |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 0 | 0
Financial assets at fair value through other comprehensive income | 0 | 0
Level 1 | - Equity securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 20,789 | 15,438
Financial assets at fair value through other comprehensive income | 2,292 | 1,622
Level 1 | - Debt securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 7,485 | 4,825
Level 1 | - Debt securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through other comprehensive income | 39,859 | 35,848
Level 1 | - Derivatives |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 1 | 39
Level 2 |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 98,571 | 94,533
Financial assets at fair value through other comprehensive income | 3,967 | 2,707
Financial liabilities at fair value through profit or loss | 80,998 | 89,175
Level 2 | – Debt securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 8,445 | 7,635
Level 2 | – Deposits |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 45,014 | 57,063
Level 2 | – Trading securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 12 | 41
Level 2 | - Derivatives |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 27,528 | 24,437
Level 2 | Loans and receivables |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 62,168 | 63,316
Financial assets at fair value through other comprehensive income | 1,608 | 275
Level 2 | - Equity securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 15 | 3
Financial assets at fair value through other comprehensive income | 0 | 0
Level 2 | - Debt securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 4,596 | 4,081
Level 2 | - Debt securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through other comprehensive income | 2,360 | 2,433
Level 2 | - Derivatives |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 31,792 | 27,134
Level 3 |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 10,734 | 8,179
Financial assets at fair value through other comprehensive income | 270 | 938
Financial liabilities at fair value through profit or loss | 770 | 729
Level 3 | – Debt securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 67 | 47
Level 3 | – Deposits |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 0 | 13
Level 3 | – Trading securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 10 | 0
Level 3 | - Derivatives |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 694 | 670
Level 3 | Loans and receivables |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 6,614 | 4,131
Financial assets at fair value through other comprehensive income | 0 | 676
Level 3 | - Equity securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 141 | 150
Financial assets at fair value through other comprehensive income | 270 | 263
Level 3 | - Debt securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 3,505 | 3,364
Level 3 | - Debt securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 3,504 | 3,364
Financial assets at fair value through other comprehensive income | 0 | 0
Financial liabilities at fair value through profit or loss | 10 | 0
Level 3 | - Derivatives |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | € 475 | € 535

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- Definition The amount of financial assets at fair value through other comprehensive income. [Refer: At fair value [member]; Financial assets; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 8 -Subparagraph h -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_8_h&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of financial assets that are measured at fair value and for which gains (losses) are recognised in profit or loss. A financial asset shall be measured at fair value through profit or loss unless it is measured at amortised cost or at fair value through other comprehensive income. A gain (loss) on a financial asset measured at fair value shall be recognised in profit or loss unless it is part of a hedging relationship, it is an investment in an equity instrument for which the entity has elected to present gains and losses in other comprehensive income or it is a financial asset measured at fair value through other comprehensive income. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 8 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_8_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of financial liabilities that meet either of the following conditions: (a) they meet the definition of held for trading; or (b) upon initial recognition they are designated by the entity as at fair value through profit or loss. An entity may use this designation only when permitted by paragraph 4.3.5 of IFRS 9 (embedded derivatives) or when doing so results in more relevant information, because either: (a) it eliminates or significantly reduces a measurement or recognition inconsistency (sometimes referred to as ‘an accounting mismatch’) that would otherwise arise from measuring assets or liabilities or recognising the gains and losses on them on different bases; or (b) a group of financial liabilities or financial assets and financial liabilities is managed and its performance is evaluated on a fair value basis, in accordance with a documented risk management or investment strategy, and information about the group is provided internally on that basis to the entity’s key management personnel (as defined in IAS 24). [Refer: At fair value [member]; Key management personnel of entity or parent [member]; Derivatives [member]; Financial assets; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 8 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_8_e&doctype=Standard -URIDate 2024-03-27 + Details
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