Equity - Transactions related to capital reduction (Detail) - EUR (€) € / shares in Units, € in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Share Repurchase Program [Line Items] | |||
| Amount paid | € 60 | ||
| Cancellation of treasury shares | € 0 | € 0 | € 0 |
| Capital reduction program | |||
| Share Repurchase Program [Line Items] | |||
| Number of treasury shares acquired (in shares) | 0 | 4,437,164 | 12,964,445 |
| Average market price (in EUR per share) | € 37.56 | € 37.25 | |
| Amount paid | € 167 | € 483 | |
| Cancellation of treasury shares (in shares) | 0 | 4,437,164 | 15,134,054 |
| Cancellation of treasury shares | € 167 | € 566 | |
| Total shares in treasury at year-end (in shares) | 0 | 0 | 0 |
| Total cost | € 0 | € 0 | € 0 |