Other Non-Current Liabilities - Additional Information (Detail) - EUR (€) € in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Noncurrent Liabilities [Line Items] | ||
| Lease liabilities | € 187 | € 216 |
| Aegon Ltd. [member] | ||
| Noncurrent Liabilities [Line Items] | ||
| Lease liabilities | 19 | € 25 |
| Aegon Ltd. [member] | First 5 years [member] | ||
| Noncurrent Liabilities [Line Items] | ||
| Lease liabilities | € 12 |