| Line Item | Dec 31, 2025 | Dec 31, 2024 | Dec 31, 2023 | Dec 31, 2022 | Dec 31, 2021 | Dec 31, 2020 | Dec 31, 2019 | Dec 31, 2018 | Dec 31, 2017 |
|---|---|---|---|---|---|---|---|---|---|
| Profit or loss [abstract] | |||||||||
| Insurance revenue | |||||||||
| Insurance service expenses | |||||||||
| Net income / (expenses) on reinsurance held | |||||||||
| Result before share in profit / (loss) of joint ventures, associates and tax | |||||||||
| Share in profit / (loss) of joint ventures | |||||||||
| Share in profit / (loss) of associates | |||||||||
| Result before tax from continuing operations | |||||||||
| Net result from continuing operations | |||||||||
| Net result from discontinued operations | |||||||||
| Net result from continuing and discontinued operations | |||||||||
| Net income/ (loss) attributable to: | |||||||||
| Owners of Aegon Ltd. | |||||||||
| Non-controlling interests |