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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
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

X

- Definition

The amount of financial assets at fair value through other comprehensive income. [Refer: At fair value [member]; Financial assets; Other comprehensive income]

+ References

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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]

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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]

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