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Capital management - Additional information (Details) - EUR (€) € / shares in Units, € in Millions |  | 1 Months Ended | 6 Months Ended |
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May 02, 2025 | May 31, 2025 | Aug. 31, 2024 | May 31, 2024 | Aug. 31, 2023 | Jun. 30, 2025 | Dec. 31, 2024
Disclosure Of Capital Management [Line Items] |  |  |  |  |  |  |
Net profit after dividend reserving |  |  |  |  |  | € 1,565 |
Dividend per ordinary share paid (in EUR per share) | € 0.71 | € 0.710 | € 0.350 | € 0.756 | € 0.350 |  |
Proposed cash dividend, per ordinary share (in EUR per share) |  |  |  |  |  | € 0.350 |
Share repurchase program three |  |  |  |  |  |  |
Disclosure Of Capital Management [Line Items] |  |  |  |  |  |  |
Share buyback programme authorized | € 2,000 |  |  |  |  |  |
Fully-loaded |  |  |  |  |  |  |
Disclosure Of Capital Management [Line Items] |  |  |  |  |  |  |
Common equity Tier 1 ratio |  |  |  |  |  | 13.30% | 13.60%
Increase (decrease) due to departure from requirement of IFRS |  |  |  |  |  |  |
Disclosure Of Capital Management [Line Items] |  |  |  |  |  |  |
CET1, ambition |  |  |  |  |  | 12.50% |
Maximum distributable amount, management basis points buffer |  |  |  |  |  | 1.76% |
Maximum distributable amount trigger level percentage |  |  |  |  |  | 10.74% |
Dividend pay-out ratio |  |  |  |  |  | 50.00% |

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- Definition The amount of dividends paid per ordinary share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 34 -IssueDate 2024-01-01 -Paragraph 16A -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=34&code=ifrs-tx-2024-en-r&anchor=para_16A_f&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount, per share, of dividends proposed or declared before financial statements were authorised for issue but not recognised as distribution to owners. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 137 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_137_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition Common Equity Tier 1, Ambition Percent + References No definition available. + Details
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- Definition Common equity tier one capital ratio + References No definition available. + Details
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- Definition Dividend Pay-Out Ratio + References No definition available. + Details
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- Definition Maximum Distributable Amount, Management Basis Points Buffer + References No definition available. + Details
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- Definition Maximum Distributable Amount trigger level percentage. + References No definition available. + Details
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- Definition Share Buyback Programme Authorized + References No definition available. + Details
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