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Equity - Summary of changes in issued share capital (Details) - EUR (€) € / shares in Units, shares in Thousands, € in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Reconciliation of number of shares outstanding [abstract] |  |  |  |
Beginning balance, ordinary shares (in shares) |  | 3,726,539 | 3,904,065 | 3,900,669
Issue of shares (in shares) |  | 5 | 2,935 | 3,397
Cancellation of shares (in shares) |  | (228,350) | (180,461) |
Ending balance, ordinary shares (in shares) |  | 3,498,194 | 3,726,539 | 3,904,065
Beginning balance, amount |  | € 37 | € 39 | € 39
Cancellation of shares | € (1,201) | (2) | (2) |
Issue of shares |  | 0 |  |
Ending balance, amount |  | € 35 | € 37 | € 39
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 2023-01-01 -Paragraph 79 -Subparagraph a -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_79_a_iv&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The increase in equity through the issue of equity instruments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 106 -Subparagraph d -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_106_d_iii&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 78 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_78_e&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 79 -Subparagraph a -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_79_a_iv&doctype=Standard -URIDate 2023-03-23 + Details
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