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Equity - Schedule of changes in retained earnings (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of equity [Line Items] |  |  |
Retained earnings, opening balance | € 41,538 | € 35,462 |
Dividend and other distributions | (2,671) | (3,390) | € (2,382)
Employee share plans | (7) | 27 | 29
Retained earings, closing balance | 40,299 | 41,538 | 35,462
Retained earnings |  |  |
Disclosure of equity [Line Items] |  |  |
Retained earnings, opening balance | 41,538 | 35,462 | 32,149
Transfer to/from other reserves | 899 | (8) | 26
Result for the year | 3,804 | 11,965 | 5,760
Dividend and other distributions | (2,668) | (3,349) | (2,342)
Employee share plans | (7) | 15 | 12
Changes in composition of the group and other changes | (3,222) | (1,984) | (143)
Retained earings, closing balance | 40,299 | 41,538 | 35,462
Retained earnings | Impact IAS 29 on opening balance |  |  |
Disclosure of equity [Line Items] |  |  |
Retained earnings, opening balance | € (45) | (563) |
Retained earings, closing balance |  | € (45) | € (563)

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