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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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May 31, 2023 shares | May 31, 2022 shares | Dec. 31, 2023 EUR (€) shares | Dec. 31, 2022 EUR (€) shares | Dec. 31, 2021 EUR (€) shares
With market condition | Performance share plan one |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Number of options granted (in shares) |  |  | 126,935 | 123,940 |
Restricted shares |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Total expense for restricted share plans | € |  |  | € 231 | € 206 | € 193
Number of shares not yet fully vested (in shares) |  |  | 9,773,084 | 9,245,513 | 9,507,849
Restricted share plan 2023 |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Number of shares not yet fully vested (in shares) |  |  | 3,780,513 | 0 | 0
Restricted share plan 2023 | Performance share plan one |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Number of options granted (in shares) |  |  | 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 |  |
Restricted share plan 2022 |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Number of shares not yet fully vested (in shares) |  |  | 3,099,158 | 3,330,801 | 0
Restricted share plan 2022 | Performance share plan one |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Number of options granted (in shares) |  |  |  | 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) |  |  |  | 1,343,805 |
Restricted share plan 2021 |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Number of shares not yet fully vested (in shares) |  |  | 2,893,413 | 3,097,531 | 3,364,895
Restricted share plan 2021 | Performance share plan one |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Number of options granted (in shares) |  |  |  |  | 3,484,420
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 | 114,874 |  |  | 1,274,519
Restricted share plan 2020 |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Number of shares not yet fully vested (in shares) |  |  | 0 | 2,817,181 | 3,014,496
Restricted share plan 2019 |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Number of shares not yet fully vested (in shares) |  |  | 0 | 0 | 3,128,458

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