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Consolidated shareholders’ equity - Summary of Number of Restricted Shares Not Yet Fully Vested (Details) € in Millions | 1 Months Ended | 12 Months Ended
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Apr. 30, 2024 shares | May 31, 2023 shares | May 31, 2022 shares | Dec. 31, 2024 EUR (€) shares | Dec. 31, 2023 EUR (€) shares | Dec. 31, 2022 EUR (€) shares
With market condition | Performance share plan one |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Number of options granted (in shares) |  |  |  |  | 147,894 | 126,935 | 123,940
Disclosure of stock subscription option plan outstanding and option exercised [line items] |  |  |  |  |  |  |
Number of options granted (in shares) |  |  |  |  | 147,894 | 126,935 | 123,940
Restricted shares |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Total expense for restricted share plans | € | [1] |  |  |  | € 260 | € 231 | € 206
Number of shares not yet fully vested (in shares) | [1] |  |  |  | 10,914,134 | 9,773,084 | 9,245,513
Restricted Share Plan 2024 Member |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Number of shares not yet fully vested (in shares) | [1] |  |  |  | 4,454,299 | 0 | 0
Restricted Share Plan 2024 Member | Performance share plan one |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Number of options granted (in shares) | [2] |  |  |  | 4,505,145 |  |
Disclosure of stock subscription option plan outstanding and option exercised [line items] |  |  |  |  |  |  |
Number of options granted (in shares) | [2] |  |  |  | 4,505,145 |  |
Restricted Share Plan 2024 Member | With market condition | Performance share plan one |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Number of options granted (in shares) |  | 139,665 |  |  | 1,616,643 |  |
Disclosure of stock subscription option plan outstanding and option exercised [line items] |  |  |  |  |  |  |
Number of options granted (in shares) |  | 139,665 |  |  | 1,616,643 |  |
Restricted share plan 2023 |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Number of shares not yet fully vested (in shares) | [1] |  |  |  | 3,501,088 | 3,780,513 | 0
Restricted share plan 2023 | Performance share plan one |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Number of options granted (in shares) | [2] |  |  |  |  | 3,838,434 |
Disclosure of stock subscription option plan outstanding and option exercised [line items] |  |  |  |  |  |  |
Number of options granted (in shares) | [2] |  |  |  |  | 3,838,434 |
Restricted share plan 2023 | With market condition | Performance share plan one |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Number of options granted (in shares) |  |  |  |  |  | 1,413,387 |
Disclosure of stock subscription option plan outstanding and option exercised [line items] |  |  |  |  |  |  |
Number of options granted (in shares) |  |  |  |  |  | 1,413,387 |
Restricted share plan 2022 |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Number of shares not yet fully vested (in shares) | [1] |  |  |  | 2,958,747 | 3,099,158 | 3,330,801
Restricted share plan 2022 | Performance share plan one |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Number of options granted (in shares) | [2] |  |  |  |  |  | 3,344,432
Disclosure of stock subscription option plan outstanding and option exercised [line items] |  |  |  |  |  |  |
Number of options granted (in shares) | [2] |  |  |  |  |  | 3,344,432
Restricted share plan 2022 | With market condition | Performance share plan one |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Number of options granted (in shares) |  |  |  | 114,874 |  |  | 1,343,805
Disclosure of stock subscription option plan outstanding and option exercised [line items] |  |  |  |  |  |  |
Number of options granted (in shares) |  |  |  | 114,874 |  |  | 1,343,805
Restricted share plan 2021 |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Number of shares not yet fully vested (in shares) | [1] |  |  |  | 0 | 2,893,413 | 3,097,531
Restricted share plan 2021 | With market condition | Performance share plan one |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Number of options granted (in shares) |  |  | 121,097 |  |  |  |
Disclosure of stock subscription option plan outstanding and option exercised [line items] |  |  |  |  |  |  |
Number of options granted (in shares) |  |  | 121,097 |  |  |  |
Restricted share plan 2020 |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Number of shares not yet fully vested (in shares) | [1] |  |  |  | 0 | 0 | 2,817,181
[1] | (a)Includes shares awarded in an additional tranche subject to a higher level of market conditions: 147,894 additional shares awarded in 2024, versus 126,935 awarded in 2023 and 123,940 awarded in 2022
[2] | (a)Includes shares awarded in an additional tranche subject to a higher level of market conditions: 139,665 additional shares awarded in April 2024 and 8,229 awarded in December 2024 (versus 121,097 awarded in May 2023 and 5,838 awarded in December 2023).

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