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Equity - Schedule of share capital (Details) - EUR (€) € / shares in Units, shares in Thousands, € in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of classes of share capital [line items] |  |  |  |
Authorised share capital, ordinary shares (in shares) | 9,142,000 | 9,142,000 | 9,142,000 |
Unissued share capital, ordinary shares (in shares) | 5,994,609 | 5,643,806 | 5,415,461 |
Issued share capital, ordinary shares (in shares) | 3,147,391 | 3,498,194 | 3,726,539 |
Authorised share capital, amount | € 91 | € 91 | € 91 |
Unissued share capital, amount | 60 | 56 | 54 |
Share capital | € 31 | € 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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