Financial Instruments Carried at Fair Value - Reconciliation of Financial Instruments Categorized in Level 3 (Detail: Text Values) - EUR (€) € in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Total gains/ losses | ||
| Financial assets measured at fair value through other comprehensive income [abstract] | ||
| therein gain (loss) recognized in other comprehensive income, net of tax | € 14 | € 29 |
| therein gain (loss) recognized in Statement of income in net gains and loss | 1 | |
| Valuation technique unobservable parameters (Level 3) | ||
| Financial assets measured at fair value through other comprehensive income [abstract] | ||
| Gains (losses) recognised in profit or loss on exchange differences | (802) | 362 |
| Gains (losses) recognised in profit or loss on exchange differences | € 206 | € (19) |