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Fair value of assets and liabilities - Valuation techniques and range of unobservable inputs (Details) € in Millions	12 Months Ended
	Dec. 31, 2024 EUR (€) € / shares	Dec. 31, 2023 EUR (€) € / shares	Dec. 31, 2022 EUR (€)
Disclosure of significant unobservable inputs used in fair value measurement of assets [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 significant unobservable inputs used in fair value measurement of assets [line items]
Financial assets at fair value through other comprehensive income	42,219	38,281
Level 3
Disclosure of significant unobservable inputs used in fair value measurement of assets [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
Total financial assets	11,005	9,118	€ 7,526
Financial liabilities at fair value through profit or loss	770	729
Financial liabilities, at fair value	€ 770	€ 729	€ 732
Level 3 | - Debt securities | Price (%) | Minimum | Present value techniques
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, percentage	95.85%
Level 3 | - Debt securities | Price (%) | Maximum | Present value techniques
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, percentage	100.00%
Level 3 | - Debt securities | Price (price per share) | Minimum | Price based
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, price (in EUR per share) | € / shares	327	97
Level 3 | - Debt securities | Price (price per share) | Maximum | Price based
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, price (in EUR per share) | € / shares	520	236
Level 3 | - Debt securities | Credit spread (bps) | Minimum | Present value techniques
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, basis point spread		0.0094
Level 3 | - Debt securities | Credit spread (bps) | Maximum | Present value techniques
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, basis point spread		0.0094
Level 3 | Loans and advances
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Financial assets at fair value through profit or loss	€ 1,565	€ 2,298
Financial liabilities at fair value through profit or loss	€ 0	€ 13
Level 3 | Loans and advances | Price (%) | Minimum | Price based
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, percentage	0.00%	0.00%
Level 3 | Loans and advances | Price (%) | Maximum | Price based
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, percentage	107.00%	117.00%
Level 3 | Loans and advances | Credit spread (bps) | Minimum | Present value techniques
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, basis point spread	0.0576	0.0001
Level 3 | Loans and advances | Credit spread (bps) | Maximum | Present value techniques
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, basis point spread	0.0629	0.0012
Level 3 | Loans and advances | Prepayment rate (%) | Minimum | Present value techniques
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, basis point spread	0.02
Level 3 | Loans and advances | Prepayment rate (%) | Maximum | Present value techniques
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, basis point spread	1
Level 3 | (Reverse) repos
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Financial assets at fair value through profit or loss	€ 5,050	€ 1,832
Level 3 | (Reverse) repos | Interest rate (%) | Minimum | Present value techniques
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, basis point spread	0.02
Level 3 | (Reverse) repos | Interest rate (%) | Maximum | Present value techniques
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, basis point spread	0.02
Level 3 | Structured notes
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Financial assets at fair value through profit or loss
Financial liabilities at fair value through profit or loss	€ 67	€ 47
Level 3 | Structured notes | Price (%) | Minimum | Price based
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, percentage	93.00%	88.00%
Level 3 | Structured notes | Price (%) | Maximum | Price based
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, percentage	104.00%	96.00%
Level 3 | Structured notes | Credit spread (bps) | Minimum | Present value techniques
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, basis point spread		0.0100
Level 3 | Structured notes | Credit spread (bps) | Maximum | Present value techniques
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, basis point spread		0.0101
Level 3 | Structured notes | Equity volatility (%) | Minimum | Option pricing model
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, percentage		9.00%
Level 3 | Structured notes | Equity volatility (%) | Maximum | Option pricing model
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, percentage		23.00%
Level 3 | Structured notes | Equity/Equity correlation | Minimum | Option pricing model
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, correlation	0.7	0.8
Level 3 | Structured notes | Equity/Equity correlation | Maximum | Option pricing model
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, correlation	0.7	0.9
Level 3 | Structured notes | Equity/FX correlation | Minimum | Option pricing model
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, correlation		(0.2)
Level 3 | Structured notes | Equity/FX correlation | Maximum | Option pricing model
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, correlation		0.6
Level 3 | Structured notes | Dividend yield (%) | Minimum | Option pricing model
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, percentage		0.00%
Level 3 | Structured notes | Dividend yield (%) | Maximum | Option pricing model
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, percentage		4.00%
Level 3 | Structured notes | Prepayment rate (%) | Minimum | Present value techniques
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, basis point spread	0.9959
Level 3 | Structured notes | Prepayment rate (%) | Maximum | Present value techniques
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, basis point spread	1.0009
Level 3 | Derivatives at rates
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Financial assets at fair value through profit or loss	€ 413	€ 283
Financial liabilities at fair value through profit or loss	€ 389	€ 301
Level 3 | Derivatives at rates | Interest rate volatility (bps) | Minimum | Option pricing model
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, basis point spread		0.0001
Level 3 | Derivatives at rates | Interest rate volatility (bps) | Maximum | Option pricing model
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, basis point spread		0.0003
Level 3 | Derivatives at rates | Prepayment rate (%) | Minimum | Present value techniques
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, percentage		0.00%
Level 3 | Derivatives at rates | Prepayment rate (%) | Maximum | Present value techniques
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, percentage		0.00%
Level 3 | Derivatives at rates | Reset spread (%) | Minimum | Present value techniques
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, percentage	2.00%
Level 3 | Derivatives at rates | Reset spread (%) | Maximum | Present value techniques
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, percentage	2.00%
Level 3 | Derivatives at foreign exchange
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Financial assets at fair value through profit or loss	€ 6	€ 2
Financial liabilities at fair value through profit or loss	€ 8	€ 3
Level 3 | Derivatives at foreign exchange | Implied volatility (%) | Minimum | Option pricing model
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, percentage	2.00%	3.00%
Level 3 | Derivatives at foreign exchange | Implied volatility (%) | Maximum | Option pricing model
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, percentage	15.00%	18.00%
Level 3 | Derivative at credit
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Financial assets at fair value through profit or loss	€ 39	€ 216
Financial liabilities at fair value through profit or loss	€ 241	€ 343
Level 3 | Derivative at credit | Price (%) | Minimum | Price based
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, percentage	0.00%	0.00%
Level 3 | Derivative at credit | Price (%) | Maximum | Price based
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, percentage	100.00%	100.00%
Level 3 | Derivative at credit | Credit spread (bps) | Minimum | Present value techniques
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, basis point spread	0	0.0003
Level 3 | Derivative at credit | Credit spread (bps) | Maximum | Present value techniques
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, basis point spread	0.0091	0.0149
Level 3 | Derivatives at equity
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Financial assets at fair value through profit or loss	€ 10	€ 20
Financial liabilities at fair value through profit or loss	€ 47	€ 17
Level 3 | Derivatives at equity | Price (%) | Minimum | Price based
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, percentage		0.00%
Level 3 | Derivatives at equity | Price (%) | Maximum | Price based
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, percentage		21.00%
Level 3 | Derivatives at equity | Equity volatility (%) | Minimum | Option pricing model
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, percentage	7.00%	12.00%
Level 3 | Derivatives at equity | Equity volatility (%) | Maximum | Option pricing model
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, percentage	81.00%	75.00%
Level 3 | Derivatives at equity | Equity/Equity correlation | Minimum | Option pricing model
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, correlation	0.0	0.2
Level 3 | Derivatives at equity | Equity/Equity correlation | Maximum | Option pricing model
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, correlation	1.0	1.0
Level 3 | Derivatives at equity | Equity/FX correlation | Minimum | Option pricing model
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, correlation	(0.6)	(0.5)
Level 3 | Derivatives at equity | Equity/FX correlation | Maximum | Option pricing model
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, correlation	0.6	1.0
Level 3 | Derivatives at equity | Dividend yield (%) | Minimum | Option pricing model
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, percentage	0.00%	0.00%
Level 3 | Derivatives at equity | Dividend yield (%) | Maximum | Option pricing model
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, percentage	33.00%	14.00%
Level 3 | Other derivatives
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Financial assets at fair value through profit or loss	€ 6	€ 14
Financial liabilities at fair value through profit or loss	€ 9	€ 7
Level 3 | Other derivatives | Price (%) | Minimum | Price based
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, correlation	68
Level 3 | Other derivatives | Price (%) | Maximum | Price based
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, percentage	6800.00%
Level 3 | Other derivatives | Commodity volatility (%) | Minimum | Option pricing model
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, percentage	13.10%	11.00%
Level 3 | Other derivatives | Commodity volatility (%) | Maximum | Option pricing model
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, percentage	61.00%	94.00%
Level 3 | Other derivatives | Com/FX correlation | Minimum | Option pricing model
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, correlation	(0.40)
Level 3 | Other derivatives | Com/FX correlation | Maximum | Option pricing model
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, correlation	(0.25)
Level 3 | Loan and advances at FVOCI
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Financial assets at fair value through other comprehensive income		€ 676
Level 3 | Loan and advances at FVOCI | Price (%) | Minimum | Price based
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, percentage		85.00%
Level 3 | Loan and advances at FVOCI | Price (%) | Maximum | Price based
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, percentage		96.00%
Level 3 | Equity at FVOCI
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Financial assets at fair value through other comprehensive income	€ 270	€ 263
Level 3 | Equity at FVOCI | Price (%) | Minimum | Price based
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, percentage	122.00%	122.00%
Level 3 | Equity at FVOCI | Price (%) | Maximum | Price based
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, percentage	122.00%	122.00%
Level 3 | Equity at FVOCI | Credit spread (bps) | Minimum | Present value techniques
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, basis point spread	0.000567	0.00052
Level 3 | Equity at FVOCI | Credit spread (bps) | Maximum | Present value techniques
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, basis point spread	0.000576	0.00052
Level 3 | Equity at FVOCI | Interest rate (%) | Minimum | Present value techniques
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, percentage	1.50%	4.00%
Level 3 | Equity at FVOCI | Interest rate (%) | Maximum | Present value techniques
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, percentage	3.50%	4.00%
Level 3 | Equity at FVOCI | Payout ratio (%) | Minimum | Present value techniques
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, percentage	70.00%
Level 3 | Equity at FVOCI | Payout ratio (%) | Maximum | Present value techniques
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, percentage	90.00%
Level 3 | Equity securities
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Financial assets at fair value through profit or loss	€ 141	€ 150
Level 3 | Equity securities | Price (price per share) | Minimum | Price based
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, price (in EUR per share) | € / shares	0	0
Level 3 | Equity securities | Price (price per share) | Maximum | Price based
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, price (in EUR per share) | € / shares	5,475	5,457
Level 3 | - Debt securities
Disclosure of significant unobservable inputs used in fair value measurement of assets [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 | - Debt securities | - Debt securities | Price (%) | Minimum | Price based
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, percentage	0.00%	0.00%
Level 3 | - Debt securities | - Debt securities | Price (%) | Maximum | Price based
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Significant unobservable inputs, percentage	120.00%	122.00%

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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.

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The fair value of financial assets. [Refer: At fair value [member]; Financial assets]

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

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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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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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