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Employee Benefit Arrangements - Pension, Other Postretirement Benefit Plans and Other Benefit Plans (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]      
Annual credit earned by participants, percentage of eligible compensation 4.00%    
Deferred compensation commitment $ 343 $ 330  
Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation 1,989 1,912 $ 1,999
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 63 (1) 23
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation 6 8  
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) $ 1 $ 1 $ 1