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Summary of Market Risk Benefit (Detail) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Market Risk Benefit [Line Items]    
Asset $ 54 $ 43
Liability 500 625
Net liability 446 582
Fixed Indexed Annuities    
Market Risk Benefit [Line Items]    
Asset 0 0
Liability 43 55
Net liability 43 55
Variable Annuities    
Market Risk Benefit [Line Items]    
Asset 54 43
Liability 457 570
Net liability $ 403 $ 527