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Consolidated shareholders’ equity - Disclosure of Stock Subscription Option Plan Outstanding and Option Exercised (Details) € / shares in Units, € in Millions |  |  |  |  |  |  | 12 Months Ended
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Apr. 30, 2019 shares | May 02, 2018 shares | May 10, 2017 shares | May 04, 2016 shares | Jun. 24, 2015 shares | Mar. 05, 2014 shares | Dec. 31, 2024 EUR (€) shares € / shares | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 EUR (€)
Disclosure of stock subscription option plan outstanding and option exercised [line items] |  |  |  |  |  |  |  |  |
Items subsequently reclassifiable to profit or loss(e) | € |  |  |  |  |  |  | € 2,488 | € (1,448) | € 2,367
Stock subscription option plan |  |  |  |  |  |  |  |  |
Disclosure of stock subscription option plan outstanding and option exercised [line items] |  |  |  |  |  |  |  |  |
Number of options outstanding (in shares) |  |  |  |  |  |  | 934,444 |  |
Stock subscription option plan five |  |  |  |  |  |  |  |  |
Disclosure of stock subscription option plan outstanding and option exercised [line items] |  |  |  |  |  |  |  |  |
Number of options granted (in shares) |  |  |  |  |  | 1,009,250 |  |  |
Exercise price (in euros per share) | € / shares |  |  |  |  |  |  | € 73.48 |  |
Number of options outstanding (in shares) |  |  |  |  |  |  | 0 |  |
Stock subscription option plan six |  |  |  |  |  |  |  |  |
Disclosure of stock subscription option plan outstanding and option exercised [line items] |  |  |  |  |  |  |  |  |
Number of options granted (in shares) |  |  |  |  | 435,000 |  |  |  |
Exercise price (in euros per share) | € / shares |  |  |  |  |  |  | € 89.38 |  |
Number of options outstanding (in shares) |  |  |  |  |  |  | 159,250 |  |
Stock subscription option plan seven |  |  |  |  |  |  |  |  |
Disclosure of stock subscription option plan outstanding and option exercised [line items] |  |  |  |  |  |  |  |  |
Number of options granted (in shares) |  |  |  | 402,750 |  |  |  |  |
Exercise price (in euros per share) | € / shares |  |  |  |  |  |  | € 75.90 |  |
Number of options outstanding (in shares) |  |  |  |  |  |  | 136,000 |  |
Stock subscription option plan eight |  |  |  |  |  |  |  |  |
Disclosure of stock subscription option plan outstanding and option exercised [line items] |  |  |  |  |  |  |  |  |
Number of options granted (in shares) |  |  | 378,040 |  |  |  |  |  |
Exercise price (in euros per share) | € / shares |  |  |  |  |  |  | € 88.97 |  |
Number of options outstanding (in shares) |  |  |  |  |  |  | 257,010 |  |
Stock subscription option plan nine |  |  |  |  |  |  |  |  |
Disclosure of stock subscription option plan outstanding and option exercised [line items] |  |  |  |  |  |  |  |  |
Number of options granted (in shares) |  | 220,000 |  |  |  |  |  |  |
Exercise price (in euros per share) | € / shares |  |  |  |  |  |  | € 65.84 |  |
Number of options outstanding (in shares) |  |  |  |  |  |  | 168,784 |  |
Stock subscription option plan ten |  |  |  |  |  |  |  |  |
Disclosure of stock subscription option plan outstanding and option exercised [line items] |  |  |  |  |  |  |  |  |
Number of options granted (in shares) | 220,000 |  |  |  |  |  |  |  |
Exercise price (in euros per share) | € / shares |  |  |  |  |  |  | € 76.71 |  |
Number of options outstanding (in shares) |  |  |  |  |  |  | 213,400 |  |

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