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Policyholder Account Balances, Future Policy Benefits and Claims - Change in Unearned Income (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Deferred Income [Roll Forward]    
Beginning balance $ 489 $ 410
Deferral of revenue 60 112
Amortization (20) (33)
Ending balance 529 489
Universal Life Insurance    
Deferred Income [Roll Forward]    
Beginning balance 27 27
Deferral of revenue 0 1
Amortization (1) (1)
Ending balance 26 27
Variable Universal Life Insurance    
Deferred Income [Roll Forward]    
Beginning balance 196 150
Deferral of revenue 34 59
Amortization (8) (13)
Ending balance 222 196
Indexed Universal Life Insurance    
Deferred Income [Roll Forward]    
Beginning balance 266 233
Deferral of revenue 26 52
Amortization (11) (19)
Ending balance $ 281 $ 266