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Future Policy Benefits - Additional Information (Detail) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Life Insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for future policy benefit adverse development expenses $ 5  
Liability for future policy benefit cumulative increase (decrease) from cash flow change   $ 81
Liability for future policy benefit cumulative increase (decrease) of actual variance from expected experience $ 12 23
Percentage of net premium ratio capped 100.00%  
Fixed annuities    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for future policy benefit cumulative increase (decrease) from cash flow change   (33)
Liability for future policy benefit cumulative increase (decrease) of actual variance from expected experience $ (42) (30)
Long-term Care Insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for future policy benefit cumulative increase (decrease) from cash flow change (86) (16)
Liability for future policy benefit cumulative increase (decrease) of actual variance from expected experience $ 48 $ 315