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Policyholder Account Balances - Summary of Liabilities for Policyholder Account (Detail) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Dec. 31, 2022
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 15,047 $ 15,540  
Death and other insurance benefits 2,914 2,887  
Indexed universal life embedded derivatives      
Policyholder Account Balance [Line Items]      
Policyholder account balances [1] 16 15  
Fixed indexed annuity embedded derivatives      
Policyholder Account Balance [Line Items]      
Policyholder account balances [1] 160 165  
Life Insurance      
Policyholder Account Balance [Line Items]      
Policyholder account balances 7,341 7,460 $ 7,694
Fixed Annuity      
Policyholder Account Balance [Line Items]      
Policyholder account balances 4,113 4,479 5,477
Variable Annuity      
Policyholder Account Balance [Line Items]      
Policyholder account balances 492 529 $ 610
Additional insurance liabilities      
Policyholder Account Balance [Line Items]      
Death and other insurance benefits [2] 2,914 2,887  
Other      
Policyholder Account Balance [Line Items]      
Other $ 11 $ 5  
[1] See note 5 for additional information.
[2] Represents additional liabilities related to death or other insurance benefits that are recorded within policyholder account balances and are considered long-duration insurance contracts. See note 10 for additional information.