Shareholders' Equity - Summary of Share Capital - Par Value (Detail) - EUR (€) € / shares in Units, shares in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Disclosure of classes of share capital [Line Items] | |||
| Issued capital | € 229 | € 241 | € 265 |
| Weighted average shares | 1,553,000 | 1,630,000 | 1,879,000 |
| Common shares [member] | |||
| Disclosure of classes of share capital [Line Items] | |||
| Issued capital | € 189 | € 198 | € 218 |
| Authorized share capital | € 480 | € 480 | € 480 |
| Number of authorized shares | 4,000,000 | 4,000,000 | 4,000,000 |
| Par value in cents per share | € 12 | € 12 | € 12 |
| Beginning balance | 1,652,797 | 1,814,727 | 2,109,430 |
| Shares withdrawn | (79,678) | (161,929) | (294,703) |
| Ending balance | 1,573,120 | 1,652,797 | 1,814,727 |
| Beginning balance | € 198 | € 218 | € 253 |
| Shares withdrawn | (10) | (19) | (35) |
| Ending balance | € 189 | € 198 | € 218 |
| Weighted average shares | 1,649,305 | 1,753,162 | 2,067,119 |
| Common share B [member] | |||
| Disclosure of classes of share capital [Line Items] | |||
| Issued capital | € 40 | € 42 | € 47 |
| Authorized share capital | € 240 | € 240 | € 240 |
| Number of authorized shares | 2,000,000 | 2,000,000 | 2,000,000 |
| Par value in cents per share | € 12 | € 12 | € 12 |
| Beginning balance | 353,388 | 389,759 | 546,196 |
| Shares withdrawn | (17,557) | (36,371) | (156,437) |
| Ending balance | 335,831 | 353,388 | 389,759 |
| Beginning balance | € 42 | € 47 | € 66 |
| Shares withdrawn | (2) | (4) | (19) |
| Ending balance | € 40 | € 42 | € 47 |
| Weighted average shares | 352,618 | 388,169 | 523,149 |