v3.26.1
Other Equity Instruments - Summary of Coupon Details - Perpetual Cumulative Subordinated Bonds (Parenthetical) (Detail)
€ in Millions
 12 Months Ended
Dec. 31, 2025
EUR (€)
Disclosure of other equity instruments [line items]  
Principal amount € 950
Perpetual cumulative subordinated bonds [member]  
Disclosure of other equity instruments [line items]  
Basis point description If the bonds are not called on the respective call dates and after consecutive periods of 10 years, the coupons will be reset at the then prevailing effective yield of ten-year Dutch government securities plus a spread of 85 basis points.
Basis point 0.85%
Aegon Ltd. [member] | Top of range [member]  
Disclosure of other equity instruments [line items]  
Interest rate 6.625%
Borrowing maturity 14 years
Aegon Ltd. [member] | Bottom of range [member]  
Disclosure of other equity instruments [line items]  
Interest rate 6.125%
Borrowing maturity 6 years
EUR 114 million [member] | Perpetual cumulative subordinated bonds [member]  
Disclosure of other equity instruments [line items]  
Principal amount € 114
Interest rate 8.00%
Borrowing maturity 2035
Coupon rate maturity June 8, 2005
EUR 114 million [member] | Top of range [member] | Perpetual cumulative subordinated bonds [member]  
Disclosure of other equity instruments [line items]  
Interest rate 4.156%
Coupon rate maturity June 8, 2015
EUR 114 million [member] | Bottom of range [member] | Perpetual cumulative subordinated bonds [member]  
Disclosure of other equity instruments [line items]  
Interest rate 1.506%
Coupon rate maturity June 8, 2025
EUR 136 million [member] | Perpetual cumulative subordinated bonds [member]  
Disclosure of other equity instruments [line items]  
Principal amount € 136
Interest rate 7.25%
Borrowing maturity 2028
Coupon rate maturity October 14, 2008
EUR 136 million [member] | Top of range [member] | Perpetual cumulative subordinated bonds [member]  
Disclosure of other equity instruments [line items]  
Interest rate 5.185%
Coupon rate maturity October 14, 2018
EUR 136 million [member] | Bottom of range [member] | Perpetual cumulative subordinated bonds [member]  
Disclosure of other equity instruments [line items]  
Interest rate 1.425%
Coupon rate maturity October 14, 2028
EUR 203 million [member] | Perpetual cumulative subordinated bonds [member]  
Disclosure of other equity instruments [line items]  
Principal amount € 203
Interest rate 7.125%
Borrowing maturity 2031
Coupon rate maturity March 4, 2011
EUR 203 million [member] | Top of range [member] | Perpetual cumulative subordinated bonds [member]  
Disclosure of other equity instruments [line items]  
Interest rate 4.26%
Coupon rate maturity March 4, 2021
EUR 203 million [member] | Bottom of range [member] | Perpetual cumulative subordinated bonds [member]  
Disclosure of other equity instruments [line items]  
Interest rate 0.496%
Coupon rate maturity March 4, 2031
After June 8, 2025 | EUR 114 million [member] | Perpetual cumulative subordinated bonds [member]  
Disclosure of other equity instruments [line items]  
Interest rate 3.568%