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Separate Account Balances and Changes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Separate Account, Liability [Roll Forward]        
Balance, beginning of period     $ 952  
Balance, end of period $ 971   971  
Universal life        
Separate Account, Liability [Roll Forward]        
Balance, beginning of period 991 $ 948 952 $ 925
Interest credited before policy charges 12 10 34 31
Benefit payments (1) 0 (9) (3)
Other (31) (15) (6) (10)
Balance, end of period 971 943 971 943
Cash surrender value $ 969 $ 941 $ 969 $ 941