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Employee Benefit Arrangements - Obligations in Excess of Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 1,819 $ 1,773  
Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation 1,989 1,912 $ 1,999
Fair value of plan assets $ 1,819 $ 1,773 $ 1,831