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Changes in Policyholders' Account Balances (Details) - Investment contract reserves: - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Deferred Fixed Annuity        
Policyholder Account Balance [Roll Forward]        
Balance, beginning of period $ 618 $ 696 $ 656 $ 734
Premiums received 10 13 29 38
Policy charges 0 0 0 0
Surrenders and withdrawals (25) (32) (88) (100)
Benefit payments (4) (3) (9) (9)
Interest credited 6 6 17 17
Balance, end of period $ 605 $ 680 $ 605 $ 680
Weighted average crediting rate 3.64% 3.45% 3.64% 3.45%
Net amount at risk $ 0 $ 0 $ 0 $ 0
Cash surrender value 599 675 599 675
Universal life        
Policyholder Account Balance [Roll Forward]        
Balance, beginning of period 456 456 457 457
Premiums received 9 8 28 28
Policy charges (10) (9) (30) (29)
Surrenders and withdrawals (2) (2) (9) (9)
Benefit payments (1) (1) (4) (5)
Interest credited 4 4 14 14
Balance, end of period $ 456 $ 456 $ 456 $ 456
Weighted average crediting rate 4.36% 4.29% 4.36% 4.29%
Net amount at risk $ 3,865 $ 3,989 $ 3,865 $ 3,989
Cash surrender value $ 426 $ 424 $ 426 $ 424