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Equity - Schedule of changes in treasury shares (Details) - EUR (€) € in Millions | 1 Months Ended | 5 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2023 | Oct. 13, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of equity [Line Items] |  |  |  |  |
Opening balance |  |  | € (1,205) | € (1,612) | € (4)
Purchased/sold for trading purposes |  |  | (7) | 4 | (4)
Purchased under staff share plans |  |  | (42) |  |
Distributed under staff share plans |  |  | 41 |  |
Purchased Share buyback programme |  |  | (3,482) | (1,721) | (1,604)
Cancelled Share buyback programme |  |  | 2,701 | 2,124 |
Closing balance |  |  | € (1,994) | € (1,205) | € (1,612)
Beginning balance, ordinary shares (in shares) |  |  | 3,726,539,000 | 3,904,065,000 | 3,900,669,000
Issue of shares (in shares) |  |  | 5,000 | 2,935,000 | 3,397,000
Share buyback programme (in shares) |  | 121,300,000 |  |  |
Cancelled Share buyback programme (in shares) | (107,000,000) |  | (228,350,000) | (180,461,000) |
Ending balance, ordinary shares (in shares) |  |  | 3,498,194,000 | 3,726,539,000 | 3,904,065,000
Treasury shares |  |  |  |  |
Disclosure of equity [Line Items] |  |  |  |  |
Beginning balance, ordinary shares (in shares) |  |  | 107,395,000 | 128,301,000 | 572,000
Issue of shares (in shares) |  |  | 464,000 | (312,000) | 102,000
Purchased under staff share and stock option plans (in shares) |  |  | 3,156,000 |  |
Distributed under staff share and stock option plans (in shares) |  |  | (3,106,000) |  |
Share buyback programme (in shares) |  |  | 275,013,000 | 159,866,000 | 127,628,000
Ending balance, ordinary shares (in shares) |  |  | 154,571,000 | 107,395,000 | 128,301,000

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