Derivatives - Derivatives Not Designated In Hedge (Detail) - EUR (€) € in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Disclosure of derivative financial instruments [Line Items] | ||
| Derivative assets | € 485 | € 771 |
| Derivative liabilities | 1,469 | 2,435 |
| Derivatives not designated as hedges - where Aegon bears the risk [member] | ||
| Disclosure of derivative financial instruments [Line Items] | ||
| Derivative assets | 350 | 477 |
| Derivative liabilities | 414 | 1,025 |
| Derivatives not designated as hedges - where Aegon bears the risk [member] | Derivatives held as an economic hedge [member] | ||
| Disclosure of derivative financial instruments [Line Items] | ||
| Derivative assets | 350 | 477 |
| Derivative liabilities | 339 | 954 |
| Derivatives not designated as hedges - where Aegon bears the risk [member] | Bifurcated embedded derivatives [member] | ||
| Disclosure of derivative financial instruments [Line Items] | ||
| Derivative liabilities | € 75 | € 71 |