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Capital Management and Solvency - Aegon's Estimated Capital Position (Detail) - Aegon Ltd. solvency ratio - EUR (€)
€ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2026
 [1]
Dec. 31, 2025
Disclosure Of Estimated Capital Position [Line Items]    
Group Eligible Own Funds € 11,378 € 11,901
Group SCR € 6,715 € 6,464
Group Solvency ratio [2] 169.00% 184.00%
[1] The solvency ratios are estimates and are not final until filed with the respective supervisory authority
[2] Including our share of a.s.r. Excess of Assets over Liabilities (minus own shares and minus minority interests) and SCR in our Group Solvency numbers.