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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) (Details) - EUR (€) € in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | € 152,486 | € 137,580
Financial assets at fair value through other comprehensive income | 49,846 | 46,389
Financial liabilities at fair value through profit or loss | 93,524 | 86,900
– Debt securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 9,218 | 9,966
– Deposits |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 55,609 | 45,014
– Trading securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 3,671 | 3,653
- Derivatives |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 25,026 | 28,267
Loans and receivables |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 86,227 | 68,782
Financial assets at fair value through other comprehensive income | 1,475 | 1,608
- Equity securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 22,916 | 20,945
Financial assets at fair value through other comprehensive income | 2,753 | 2,562
- Debt securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 14,501 | 15,586
Debt securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through other comprehensive income | 45,618 | 42,219
- Derivatives |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 28,841 | 32,268
Level 1 |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 29,100 | 28,275
Financial assets at fair value through other comprehensive income | 46,893 | 42,151
Financial liabilities at fair value through profit or loss | 4,868 | 5,131
Level 1 | – Debt securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 1,398 | 1,455
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 | 3,365 | 3,631
Level 1 | - Derivatives |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 105 | 45
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 | 22,767 | 20,789
Financial assets at fair value through other comprehensive income | 2,470 | 2,292
Level 1 | - Debt securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 6,259 | 7,485
Level 1 | Debt securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through other comprehensive income | 44,423 | 39,859
Level 1 | - Derivatives |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 74 | 1
Level 2 |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 112,228 | 98,571
Financial assets at fair value through other comprehensive income | 2,513 | 3,967
Financial liabilities at fair value through profit or loss | 88,043 | 80,998
Level 2 | – Debt securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 7,766 | 8,445
Level 2 | – Deposits |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 55,609 | 45,014
Level 2 | – Trading securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 297 | 12
Level 2 | - Derivatives |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 24,371 | 27,528
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 | 78,494 | 62,168
Financial assets at fair value through other comprehensive income | 1,319 | 1,608
Level 2 | - Equity securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 4 | 15
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 | 5,663 | 4,596
Level 2 | Debt securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through other comprehensive income | 1,194 | 2,360
Level 2 | - Derivatives |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 28,067 | 31,792
Level 3 |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 11,157 | 10,734
Financial assets at fair value through other comprehensive income | 440 | 270
Financial liabilities at fair value through profit or loss | 613 | 770
Level 3 | – Debt securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 53 | 67
Level 3 | – Deposits |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 0 | 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 | 10 | 10
Level 3 | - Derivatives |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial liabilities at fair value through profit or loss | 550 | 694
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 | 7,733 | 6,614
Financial assets at fair value through other comprehensive income | 156 | 0
Level 3 | - Equity securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 145 | 141
Financial assets at fair value through other comprehensive income | 283 | 270
Level 3 | - Debt securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | 2,579 | 3,505
Level 3 | Debt securities |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through other comprehensive income | 0 | 0
Level 3 | - Derivatives |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Financial assets at fair value through profit or loss | € 700 | € 475

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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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