Investments - Summary of investments in real estate held by entities (Detail) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Disclosure Of Detailed Information About Investments In Real Estate Held By Entities [Line Items] | ||
| Value of Aegon's properties which were appraised in the current year | 96.00% | 100.00% |
| Appraisals performed by independent external appraisers | 91.00% | 96.00% |