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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, 2023 | Dec. 31, 2022
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Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | € 123,015 | € 113,766
Financial assets at fair value through other comprehensive income | 41,116 | 31,625
Financial liabilities at fair value through profit or loss | 94,638 | 93,019
Debt Securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 8,770 | 6,619
Deposits |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 57,076 | 50,257
Trading securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 3,645 | 2,226
Derivatives |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 25,148 | 33,917
Loans and receivables |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 67,446 | 56,644
Financial assets at fair value through other comprehensive income | 951 | 643
Equity securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 15,590 | 11,941
Financial assets at fair value through other comprehensive income | 1,885 | 1,887
Debt securities and structure notes |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 12,270 | 10,447
Debt securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through other comprehensive income | 38,281 | 29,095
Derivatives |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 27,708 | 34,734
Level 1 |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 20,302 | 13,441
Financial assets at fair value through other comprehensive income | 37,470 | 27,284
Financial liabilities at fair value through profit or loss | 4,733 | 2,814
Level 1 | Debt Securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 1,088 | 822
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 | 3,604 | 1,952
Level 1 | Derivatives |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 41 | 40
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 | 15,438 | 11,783
Financial assets at fair value through other comprehensive income | 1,622 | 1,639
Level 1 | Debt securities and structure notes |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 4,825 | 1,636
Level 1 | Debt securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through other comprehensive income | 35,848 | 25,644
Level 1 | Derivatives |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 39 | 22
Level 2 |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 94,533 | 93,690
Financial assets at fair value through other comprehensive income | 2,707 | 3,451
Financial liabilities at fair value through profit or loss | 89,175 | 89,473
Level 2 | Debt Securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 7,635 | 5,743
Level 2 | Deposits |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 57,063 | 50,257
Level 2 | Trading securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 41 | 273
Level 2 | Derivatives |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 24,437 | 33,200
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 | 63,316 | 54,097
Financial assets at fair value through other comprehensive income | 275 | 0
Level 2 | Equity securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 3 | 2
Financial assets at fair value through other comprehensive income | 0 | 0
Level 2 | Debt securities and structure notes |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 4,081 | 5,361
Level 2 | Debt securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through other comprehensive income | 2,433 | 3,451
Level 2 | Derivatives |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 27,134 | 34,229
Level 3 |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 8,179 | 6,635
Financial assets at fair value through other comprehensive income | 938 | 891
Financial liabilities at fair value through profit or loss | 729 | 732
Level 3 | Debt Securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 47 | 53
Level 3 | Deposits |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 13 | 0
Level 3 | Trading securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 0 | 1
Level 3 | Derivatives |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 670 | 678
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 | 4,131 | 2,547
Financial assets at fair value through other comprehensive income | 676 | 643
Level 3 | Equity securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 150 | 156
Financial assets at fair value through other comprehensive income | 263 | 247
Level 3 | Debt securities and structure notes |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 3,364 | 3,450
Level 3 | Debt securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 3,364 | 3,447
Financial assets at fair value through other comprehensive income | 0 | 0
Financial liabilities at fair value through profit or loss | 0 | 1
Level 3 | Derivatives |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | € 535 | € 483

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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 2023-01-01 -Paragraph 8 -Subparagraph h -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_8_h&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 8 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_8_a&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 8 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_8_e&doctype=Standard -URIDate 2023-03-23 + Details
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