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Consolidated shareholders’ equity - Principal Characteristics of Restricted Share Plans (Details) € / shares in Units, € in Millions | 1 Months Ended | 12 Months Ended
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Dec. 31, 2023 shares | May 31, 2023 shares | Dec. 31, 2022 shares | May 31, 2022 shares | Dec. 31, 2023 EUR (€) shares € / shares | Dec. 31, 2022 EUR (€) shares € / shares | Dec. 31, 2021 EUR (€) shares € / shares
Performance share plan one | With market condition |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Total number of shares awarded (in shares) | shares |  |  |  |  | 126,935 | 123,940 |
Restricted share plan 2023 | Performance share plan one |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Service period |  |  |  |  | 3 years |  |
Total number of shares awarded (in shares) | shares |  |  |  |  | 3,838,434 |  |
Fair value of plan at the date of grant | € |  |  |  |  | € 326 |  |
Restricted share plan 2023 | Performance share plan one | Without market condition |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Total number of shares awarded (in shares) | shares |  |  |  |  | 2,425,047 |  |
Fair value per share awarded (in euros per share) |  |  |  |  | € 87.69 |  |
Restricted share plan 2023 | Performance share plan one | With market condition |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Total number of shares awarded (in shares) | shares |  |  |  |  | 1,413,387 |  |
Fair value per share awarded (in euros per share) |  |  |  |  | € 83.74 |  |
Fair value per share awarded for three year service period, additional shares (in euros per share) |  |  |  |  | 43.60 |  |
Fair value per share awarded for three year service period, to chief executive officer (in euros per share) |  |  |  |  | € 82.17 |  |
Restricted share plan 2023 | Performance share plan two |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Service period |  |  |  |  | 3 years |  |
Total number of shares awarded (in shares) | shares |  |  |  |  | 65,129 |  |
Fair value of plan at the date of grant | € |  |  |  |  | € 5 |  |
Restricted share plan 2023 | Performance share plan two | Without market condition |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Total number of shares awarded (in shares) | shares |  |  |  |  | 944 |  |
Fair value per share awarded (in euros per share) |  |  |  |  | € 77.42 |  |
Restricted share plan 2023 | Performance share plan two | With market condition |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Total number of shares awarded (in shares) | shares |  |  |  |  | 64,185 |  |
Fair value per share awarded (in euros per share) |  |  |  |  | € 74.50 |  |
Fair value per share awarded for three year service period, additional shares (in euros per share) |  |  |  |  | 34.90 |  |
Fair value per share awarded for three year service period, to chief executive officer (in euros per share) |  |  |  |  | € 0 |  |
Restricted share plan 2022 | Performance share plan one |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Service period |  |  |  |  |  | 3 years |
Total number of shares awarded (in shares) | shares |  |  |  |  |  | 3,344,432 |
Fair value of plan at the date of grant | € |  |  |  |  |  | € 294 |
Restricted share plan 2022 | Performance share plan one | Without market condition |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Total number of shares awarded (in shares) | shares |  |  |  |  |  | 2,000,627 |
Fair value per share awarded (in euros per share) |  |  |  |  |  | € 91.19 |
Restricted share plan 2022 | Performance share plan one | With market condition |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Total number of shares awarded (in shares) | shares |  |  |  |  |  | 1,343,805 |
Fair value per share awarded (in euros per share) |  |  |  |  |  | € 86.65 |
Fair value per share awarded for three year service period, additional shares (in euros per share) |  |  |  |  |  | 49.00 |
Fair value per share awarded for three year service period, to chief executive officer (in euros per share) |  |  |  |  |  | € 84.46 |
Restricted share plan 2022 | Performance share plan two |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Service period |  |  |  |  |  | 3 years |
Total number of shares awarded (in shares) | shares |  |  |  |  |  | 109,981 |
Fair value of plan at the date of grant | € |  |  |  |  |  | € 8 |
Restricted share plan 2022 | Performance share plan two | Without market condition |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Total number of shares awarded (in shares) | shares |  |  |  |  |  | 10,335 |
Fair value per share awarded (in euros per share) |  |  |  |  |  | € 79.17 |
Restricted share plan 2022 | Performance share plan two | With market condition |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Total number of shares awarded (in shares) | shares |  |  |  |  |  | 99,646 |
Fair value per share awarded (in euros per share) |  |  |  |  |  | € 69.60 |
Fair value per share awarded for three year service period, additional shares (in euros per share) |  |  |  |  |  | 54.70 |
Fair value per share awarded for three year service period, to chief executive officer (in euros per share) |  |  |  |  |  | € 0 |
Restricted share plan 2021 | Performance share plan one |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Service period |  |  |  |  |  |  | 3 years
Total number of shares awarded (in shares) | shares |  |  |  |  |  |  | 3,484,420
Fair value of plan at the date of grant | € |  |  |  |  |  |  | € 262
Restricted share plan 2021 | Performance share plan one | Without market condition |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Total number of shares awarded (in shares) | shares |  |  |  |  |  |  | 2,209,901
Fair value per share awarded (in euros per share) |  |  |  |  |  |  | € 77.27
Restricted share plan 2021 | Performance share plan one | With market condition |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Total number of shares awarded (in shares) | shares |  | 121,097 |  | 114,874 |  |  | 1,274,519
Fair value per share awarded (in euros per share) |  |  |  |  |  |  | € 71.30
Fair value per share awarded for three year service period, additional shares (in euros per share) |  |  |  |  |  |  | 0
Fair value per share awarded for three year service period, to chief executive officer (in euros per share) |  |  |  |  |  |  | € 71.30
Restricted share plan 2021 | Performance share plan two |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Service period |  |  |  |  |  |  | 3 years
Total number of shares awarded (in shares) | shares |  |  |  |  |  |  | 13,521
Fair value of plan at the date of grant | € |  |  |  |  |  |  | € 1
Restricted share plan 2021 | Performance share plan two | Without market condition |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Total number of shares awarded (in shares) | shares |  |  |  |  |  |  | 0
Fair value per share awarded (in euros per share) |  |  |  |  |  |  | € 0
Restricted share plan 2021 | Performance share plan two | With market condition |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Total number of shares awarded (in shares) | shares | 5,838 |  | 9,066 |  |  |  | 13,521
Fair value per share awarded (in euros per share) |  |  |  |  |  |  | € 68.45
Fair value per share awarded for three year service period, additional shares (in euros per share) |  |  |  |  |  |  | 0
Fair value per share awarded for three year service period, to chief executive officer (in euros per share) |  |  |  |  |  |  | € 0

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