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Equity - Summary of changes in treasury shares (Details) - EUR (€) € in Millions |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 04, 2024 | Jun. 30, 2024 | Dec. 31, 2023
Disclosure of equity [line Items] |  |  |
Opening balance as at 1 January |  | € (1,994) | € (1,205)
Purchased/sold for trading purposes |  | 2 | (7)
Purchased under staff share plans |  | (43) | (42)
Distributed under staff share plans |  | 43 | 41
Purchased Share buyback programme | € (43) | (1,533) | (3,482)
Cancelled Share buyback programme |  | 2,500 | 2,701
Closing balance |  | € (1,024) | € (1,994)
Cancelled share buyback programme (in shares) |  | (194,813,000) | (228,350,000)
Treasury shares |  |  |
Disclosure of equity [line Items] |  |  |
Beginning balance, ordinary shares (in shares) |  | 154,571,000 | 107,395,000
Issue of shares (in shares) |  | (279,000) | 464,000
Purchased under staff share and stock option plans (in shares) |  | 3,319,000 | 3,156,000
Distributed under staff share and stock option plans (in shares) |  | (3,316,000) | (3,106,000)
Share buyback programme (in shares) |  | 104,196,000 | 275,013,000
Ending balance, ordinary shares (in shares) |  | 63,678,000 | 154,571,000

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