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Equity - Schedule of changes in treasury shares (Details) - EUR (€) shares in Thousands, € in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2025 | Dec. 31, 2024
Disclosure of equity [Line Items] |  |
Opening balance | € (765) | € (1,994)
Purchased/sold for trading purposes | 7 | 2
Purchased under staff share plans | (64) | (43)
Distributed under staff share plans | 59 | 43
Purchased under Share buyback programme | (1,982) | (3,774)
Cancelled under Share buyback programme |  | 5,000
Closing balance | € (2,746) | € (765)
Treasury shares |  |
Disclosure of equity [Line Items] |  |
Beginning balance, ordinary shares (in shares) | 51,117 | 154,571
Purchased/sold for trading purposes (in shares) | (477) | (211)
Purchased under staff share and stock option plans (in shares) | 3,674 | 3,319
Distributed under staff share and stock option plans (in shares) | (3,365) | (3,343)
Purchased under Share buyback programme (in shares) | 115,604 | 247,584
Cancelled under Share buyback programme (in shares) |  | (350,803)
Ending balance, ordinary shares (in shares) | 166,552 | 51,117

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