Long-Term Borrowings - Summary of Long-Term Borrowings (Detail) - EUR (€) € in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Disclosure of long-term borrowings [Line Items] | ||
| Borrowings | € 1,982 | € 3,013 |
| Aegon Ltd. [member] | ||
| Disclosure of long-term borrowings [Line Items] | ||
| Borrowings | 740 | 781 |
| Fair value of long-term borrowings | 806 | 835 |
| Aegon Ltd. [member] | Not later than 1 year [member] | ||
| Disclosure of long-term borrowings [Line Items] | ||
| Borrowings | 0 | 0 |
| Aegon Ltd. [member] | 1-5 years [member] | ||
| Disclosure of long-term borrowings [Line Items] | ||
| Borrowings | 0 | 0 |
| Aegon Ltd. [member] | Over 5 through 10 years [member] | ||
| Disclosure of long-term borrowings [Line Items] | ||
| Borrowings | 286 | 301 |
| Aegon Ltd. [member] | Over 10 years [member] | ||
| Disclosure of long-term borrowings [Line Items] | ||
| Borrowings | € 455 | € 480 |