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Equity - Schedule of share capital (Details) - EUR (€) € / shares in Units, € in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of classes of share capital [line items] |  |  |  |
Authorised share capital, ordinary shares (in shares) | 9,142,000,000 | 9,142,000,000 | 14,729,000,000 |
Unissued share capital, ordinary shares (in shares) | 5,643,806,000 | 5,415,461,000 | 10,824,935,000 |
Issued share capital, ordinary shares (in shares) | 3,498,194,000 | 3,726,539,000 | 3,904,065,000 |
Authorised share capital, amount | € 91 | € 91 | € 147 |
Unissued share capital, amount | 56 | 54 | 108 |
Share capital | € 35 | € 37 | € 39 | € 39
Ordinary shares |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Par value (in eur per share) | € 0.01 |  |  |

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