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Future Policy Benefits - Summary of Components of Liability for Future Policy Benefits (Detail) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Liability for Future Policy Benefit, Activity [Line Items]    
Total long-duration insurance contracts $ 53,581 $ 57,456
Deferred profit liability 132 128
Cost of reinsurance 61 71
Total future policy benefits 53,774 57,655
Long-term Care Insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Total long-duration insurance contracts 41,024 43,929
Total future policy benefits 41,024 43,929
Life Insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Total long-duration insurance contracts 1,585 1,698
Total future policy benefits 1,585 1,698
Fixed annuities    
Liability for Future Policy Benefit, Activity [Line Items]    
Total long-duration insurance contracts 10,972 11,829
Total future policy benefits $ 10,972 $ 11,829