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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
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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)

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