Defined Benefit Plans - Summary of Actuarial Assumptions Used to Determine Defined Benefit Obligations (Detail) |
Dec. 31, 2025 |
Dec. 31, 2024 |
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|---|---|---|---|---|---|
| Transamerica [member] | |||||
| Financial actuarial assumptions | |||||
| Salary increase rate | 4.00% | 4.00% | |||
| Health care trend rate | 8.50% | 6.90% | |||
| Transamerica [member] | Top of range [member] | |||||
| Financial actuarial assumptions | |||||
| Discount rate | 5.45% | 5.59% | |||
| Transamerica [member] | Bottom of range [member] | |||||
| Financial actuarial assumptions | |||||
| Discount rate | 5.23% | 5.51% | [1] | ||
| Aegon United Kingdom [member] | |||||
| Financial actuarial assumptions | |||||
| Discount rate | 5.66% | 5.58% | |||
| Price inflation | 3.00% | 3.19% | |||
| Aegon Employees Netherlands B.V. [member] | |||||
| Financial actuarial assumptions | |||||
| Discount rate | 4.00% | 3.51% | |||
| Price inflation | 2.13% | 1.99% | |||
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