Employees - Summary of Charge to Operating Profit (Details) - EUR (€) € in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Disclosure of defined benefit plans [line items] | |||
| Gross service cost | € (154) | € (168) | € (119) |
| Employee contributions | 32 | 36 | 10 |
| Special termination benefits | (5) | (5) | (14) |
| Past service cost including (losses)/gains on curtailments | 18 | 32 | 3 |
| Settlements | 11 | 5 | 2 |
| Defined contribution plans | (196) | (197) | (186) |
| Post-employment benefit expense in profit or loss | (171) | (214) | (183) |
| United Kingdom | |||
| Disclosure of defined benefit plans [line items] | |||
| Special termination benefits | 0 | 0 | |
| Past service cost including (losses)/gains on curtailments | 28 | ||
| Operating cost | |||
| Disclosure of defined benefit plans [line items] | |||
| Post-employment benefit expense in profit or loss | (294) | (297) | (304) |
| Finance income/(cost) | |||
| Disclosure of defined benefit plans [line items] | |||
| Post-employment benefit expense in profit or loss | € 123 | € 83 | € 121 |