Goodwill and Other Intangible Assets - Changes of Other Intangible Assets by Asset Class (Detail: Text Values) - EUR (€) € in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Intangible assets and goodwill [abstract] | ||
| Amortization of other intangible assets included in general and administrative expenses | € 1,300 | € 1,200 |
| Changes of other intangible assets comprised of impairments on self-developed software | € 16 | € 29 |