The increase (decrease) in equity. [Refer: Equity]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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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- Definition

The amount of dividends recognised as distributions to owners.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

A component of equity representing reserves created based on legal requirements.

+ References

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Changes in transfer to or from retained earnings.

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- Definition

Legal Reserve

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Number of Share Buyback Programmes, Initiated During The Period

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Share Buyback Programme, Amount

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Share Buyback Programme Authorized

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- Definition

Share Buyback Programme, Shares

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- Definition

Share Of Associates, Joint Venture And Other Reserves Including Non-Distributable Profits From Associates and Joint Ventures

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- Definition

Shares Repurchased, Average Price Per Share

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Shares Repurchased, Effective Price Per Share

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Equity - Additional information (Details) € / shares in Units, € in Millions, shares in Millions					2 Months Ended	6 Months Ended			12 Months Ended
	May 02, 2025 EUR (€)	Mar. 04, 2025 EUR (€) € / shares shares	Mar. 03, 2025 EUR (€)	Oct. 31, 2024 EUR (€)	Jun. 30, 2025 EUR (€) € / shares shares	Jun. 30, 2025 EUR (€) programme	Apr. 30, 2025 € / shares shares	Jun. 30, 2024 EUR (€)	Dec. 31, 2024 EUR (€) programme
Disclosure of equity [Line Items]
Share of associates, joint venture and other reserves					€ 915	€ 915			€ 940
Number of share buyback programmes, initiated during the period \| programme						2			1
Purchased under Share buyback programme						€ 1,982			€ 3,774
Dividends recognised as distributions to owners						2,345		€ 2,750
Share repurchase program one
Disclosure of equity [Line Items]
Share buyback programme authorized				€ 2,000
Share buyback programme (in shares) \| shares							126.0
Shares repurchased, effective price per share (in EUR per share) \| € / shares							€ 15.89
Share repurchase program two
Disclosure of equity [Line Items]
Share buyback programme authorized			€ 70
Share buyback programme (in shares) \| shares		3.7
Shares repurchased, average price per share (in EUR per share) \| € / shares		€ 17.44
Purchased under Share buyback programme		€ 64
Share repurchase program three
Disclosure of equity [Line Items]
Share buyback programme authorized	€ 2,000
Share buyback programme (in shares) \| shares					40.0
Shares repurchased, effective price per share (in EUR per share) \| € / shares					€ 18.35
Share of associates, joint ventures and other reserves
Disclosure of equity [Line Items]
Changes in transfer to or (from) retained earnings						(342)
Retained earnings
Disclosure of equity [Line Items]
Dividends recognised as distributions to owners						2,152		€ 2,497	4,124
Software and other intangible assets
Disclosure of equity [Line Items]
Legal reserve					€ 854	854			768
Stichting Regio Bank and Stichting Vakbondsspaarbank SPN
Disclosure of equity [Line Items]
Statutory reserve					€ 495	495			897
Reserve of gain (loss) at FVOCI
Disclosure of equity [Line Items]
Increase (decrease) in equity						22			664
Reserve of unrealized gain (loss) at FVOCI
Disclosure of equity [Line Items]
Increase (decrease) in equity						33			664
Reserve of unrealized gain (loss) at FVOCI \| Bank of Beijing
Disclosure of equity [Line Items]
Increase (decrease) in equity						(3)			652
Reserve of cash flow hedges
Disclosure of equity [Line Items]
Increase (decrease) in equity						494
Unrealised revaluations and exchange rate differences
Disclosure of equity [Line Items]
Increase (decrease) in equity						(813)
Currency translation reserve \| United States of America, Dollars
Disclosure of equity [Line Items]
Increase (decrease) in equity						(661)
Currency translation reserve \| Turkey, New Lira
Disclosure of equity [Line Items]
Increase (decrease) in equity						(42)
Currency translation reserve \| Turkey, New Lira \| IAS 29
Disclosure of equity [Line Items]
Increase (decrease) in equity						72
Currency translation reserve \| United Kingdom, Pounds
Disclosure of equity [Line Items]
Increase (decrease) in equity						(41)
Currency translation reserve \| Poland, Zlotych
Disclosure of equity [Line Items]
Increase (decrease) in equity						24
Currency translation reserve \| Australia, Dollars
Disclosure of equity [Line Items]
Increase (decrease) in equity						(88)
Currency translation reserve \| Russia, Rubles
Disclosure of equity [Line Items]
Increase (decrease) in equity						93
Currency translation reserve \| Thailand, Baht
Disclosure of equity [Line Items]
Increase (decrease) in equity						(33)
Currency translation reserve \| Other Currency
Disclosure of equity [Line Items]
Increase (decrease) in equity						(64)
Statutory reserve
Disclosure of equity [Line Items]
Increase (decrease) in equity						€ (402)			€ (830)