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Employee Benefit Arrangements - Defined Contribution Plans (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Retirement Benefits [Abstract]      
Company match, percentage 6.00%    
Matching contributions, graded vesting schedule, period 4 years    
Cost recognized for defined contribution pension plans $ 51 $ 44 $ 36
Pension Plan      
Retirement Benefits [Abstract]      
Defined Benefit Plan, Amounts Recognized in Accumulated Other Comprehensive Income (Loss) 0    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Amounts Recognized in Accumulated Other Comprehensive Income (Loss) $ 0