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Equity - Schedule of changes in treasury shares (Details) - EUR (€) shares in Thousands, € in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of equity [Line Items] |  |  |
Opening balance | € (1,994) | € (1,205) | € (1,612)
Purchased/sold for trading purposes | 2 | (7) | 4
Purchased under staff share plans | (43) | (42) |
Distributed under staff share plans | 43 | 41 |
Purchased under Share buyback programme | (3,774) | (3,482) | (1,721)
Cancelled Share buyback programme | 5,000 | 2,701 | 2,124
Closing balance | € (765) | € (1,994) | € (1,205)
Beginning balance, ordinary shares (in shares) | 3,498,194 | 3,726,539 | 3,904,065
Issue of shares (in shares) |  | 5 | 2,935
Cancelled Share buyback programme (in shares) | (350,803) | (228,350) | (180,461)
Ending balance, ordinary shares (in shares) | 3,147,391 | 3,498,194 | 3,726,539
Treasury shares |  |  |
Disclosure of equity [Line Items] |  |  |
Beginning balance, ordinary shares (in shares) | 154,571 | 107,395 | 128,301
Issue of shares (in shares) | (211) | 464 | (312)
Purchased under staff share and stock option plans (in shares) | 3,319 | 3,156 |
Distributed under staff share and stock option plans (in shares) | (3,343) | (3,106) |
Share buyback programme (in shares) | 247,584 | 275,013 | 159,866
Ending balance, ordinary shares (in shares) | 51,117 | 154,571 | 107,395

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