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Equity - Summary of changes in issued share capital (Details) - EUR (€) € / shares in Units, shares in Thousands, € in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Reconciliation of number of shares outstanding [abstract] |  |  |
Beginning balance, ordinary shares (in shares) | 3,498,194 | 3,726,539 | 3,904,065
Issue of shares (in shares) |  | 5 | 2,935
Cancellation of shares (in shares) | (350,803) | (228,350) | (180,461)
Ending balance, ordinary shares (in shares) | 3,147,391 | 3,498,194 | 3,726,539
Beginning balance, amount | € 35 | € 37 | € 39
Share buyback programmes, cancellation of shares |  |  |
Ending balance, amount | 31 | 35 | 37
Share capital and share premium |  |  |
Reconciliation of number of shares outstanding [abstract] |  |  |
Share buyback programmes, cancellation of shares | € (4) | € (2) | € (2)
Ordinary shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Par value (in EUR per share) | € 0.01 |  |

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- Definition The increase (decrease) in the number of shares outstanding. [Refer: Number of shares outstanding] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 79 -Subparagraph a -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_79_a_iv&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The nominal value of capital issued. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 78 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_78_e&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The number of shares that have been authorised and issued, reduced by treasury shares held. [Refer: Treasury shares] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 79 -Subparagraph a -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_79_a_iv&doctype=Standard -URIDate 2024-03-27 + Details
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