Financial Instruments and Risk Management - Notional Amounts of Outstanding Derivative Instruments (Details) - Designated as hedging instrument € in Millions |
Dec. 31, 2025
EUR (€)
|
|---|---|
| Forward contracts | |
| Derivative [Line Items] | |
| Notional amount for hedge on forecasted R&D and other operating expenses | € 387 |
| Notional amount for hedge on forecasted manufacturing costs | 763 |
| Currency collars | |
| Derivative [Line Items] | |
| Notional amount for hedge on forecasted R&D and other operating expenses | 346 |
| Notional amount for hedge on forecasted manufacturing costs | € 593 |