Shareholders' Equity and Other Equity Instruments - Summary of Basic Earnings Per Share (Detail) - EUR (€) € / shares in Units, € in Millions, shares in Millions |
6 Months Ended | |
|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Earnings per share [line items] | ||
| Net result attributable to owners of Aegon Ltd. | € 614 | € 584 |
| Coupons on perpetual securities | (37) | (19) |
| Net result attributable to owners for basic earnings per share calculation | 577 | 565 |
| Net result attributable to common shareholders | € 574 | € 562 |
| Weighted average number of common shares outstanding (in million) | 1,489 | 1,573 |
| Basic earnings per common share (EUR per share) | € 0.39 | € 0.36 |
| Common share B [member] | ||
| Earnings per share [line items] | ||
| Net result attributable to common shareholders | € 3 | € 3 |
| Weighted average number of common shares outstanding (in million) | 328 | 345 |
| Basic earnings per common share (EUR per share) | € 0.01 | € 0.01 |