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Consolidated shareholders' equity - Summary of Principal Characteristics of Restricted Share Plans (Details) - Under 2025 plans € / shares in Units, € in Millions | 6 Months Ended
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Jun. 30, 2026 EUR (€) shares € / shares
Disclosure of classes of share capital [Line Items] |
Fair value of plan at the date of grant | € | € 329
3 year service period |
Disclosure of classes of share capital [Line Items] |
Total number of shares awarded (in shares) | 5,087,518
Service period | 3 years
5 year service period |
Disclosure of classes of share capital [Line Items] |
Total number of shares awarded (in shares) | 180,000
Service period | 5 years
Chief executive officer |
Disclosure of classes of share capital [Line Items] |
Total number of shares awarded (in shares) | 180,000
Fair value per share awarded for five year service period (in euros per share) | € / shares | € 40.46
Without market condition |
Disclosure of classes of share capital [Line Items] |
Total number of shares awarded (in shares) | 3,367,862
Fair value per share awarded for three year service period (in euros per share) | € / shares | € 65.86
With market condition |
Disclosure of classes of share capital [Line Items] |
Total number of shares awarded (in shares) | 1,719,656
With market condition | Excluding general director |
Disclosure of classes of share capital [Line Items] |
Total number of shares awarded (in shares) | 1,674,656
Fair value per share awarded for three year service period (in euros per share) | € / shares | € 57.99
With market condition | Chief executive officer |
Disclosure of classes of share capital [Line Items] |
Total number of shares awarded (in shares) | 45,000
Fair value per share awarded for three year service period (in euros per share) | € / shares | € 53.46

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