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Employee Benefit Arrangements - Obligations and Funded Status (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Change in plan assets:      
Fair value of plan assets, beginning balance $ 1,773    
Fair value of plan assets, ending balance 1,819 $ 1,773  
Pension Plan      
Change in benefit obligation:      
Benefits obligations, beginning balance 1,912 1,999  
Service cost 33 30 $ 24
Interest cost 109 102 103
Net actuarial (gains) losses 67 (98)  
Benefits paid (132) (121)  
Benefits obligations, ending balance $ 1,989 $ 1,912 1,999
Discount rate, benefit obligation 5.63% 5.88%  
Interest credit rate 4.25% 3.75%  
Change in plan assets:      
Fair value of plan assets, beginning balance $ 1,773 $ 1,831  
Actual return on plan assets 147 36  
Employer contributions 31 28  
Benefits paid (132) (122)  
Fair value of plan assets, ending balance 1,819 1,773 $ 1,831
Funded status at end of the year (170) (139)  
Actuarial gain (loss) due to discount rate $ (44) 110  
Increase in discount rate 0.60%    
decrease in discount rate (0.25%)    
Amounts recognized in the Consolidated Balance Sheets consist of:      
Prepaid benefit cost $ 164 192  
Accrued benefit cost (334) (331)  
Net amount recognized (170) (139)  
Pension Plan | Qualified Plan      
Change in benefit obligation:      
Benefits obligations, beginning balance 1,581    
Benefits obligations, ending balance 1,655 1,581  
Pension Plan | Nonqualified pension plan      
Change in benefit obligation:      
Benefits obligations, beginning balance 331    
Benefits obligations, ending balance $ 334 $ 331