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Separate Account Assets and Liabilities (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Separate Account, Liability [Roll Forward]        
Balance, beginning of period $ 1,285 $ 1,098 $ 1,189 $ 1,045
Additions (deductions):        
Acquisition from business combination 0 0 0 0
Policyholder deposits 15 18 35 39
Net investment income 1 5 10 14
Net realized capital gains on investments 16 62 112 114
Policyholder benefits and withdrawals (27) (35) (75) (59)
Net transfers from (to) separate accounts (20) 1 2 (1)
Policy charges (4) (4) (7) (7)
Total changes (19) 47 77 100
Balance, end of period $ 1,266 $ 1,145 $ 1,266 $ 1,145